| 1 | /* Coding system handler (conversion, detection, and etc). |
| 2 | Copyright (C) 1995, 1997, 1998 Electrotechnical Laboratory, JAPAN. |
| 3 | Licensed to the Free Software Foundation. |
| 4 | Copyright (C) 2001 Free Software Foundation, Inc. |
| 5 | Copyright (C) 2001, 2002 |
| 6 | National Institute of Advanced Industrial Science and Technology (AIST) |
| 7 | Registration Number H13PRO009 |
| 8 | |
| 9 | This file is part of GNU Emacs. |
| 10 | |
| 11 | GNU Emacs is free software; you can redistribute it and/or modify |
| 12 | it under the terms of the GNU General Public License as published by |
| 13 | the Free Software Foundation; either version 2, or (at your option) |
| 14 | any later version. |
| 15 | |
| 16 | GNU Emacs is distributed in the hope that it will be useful, |
| 17 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 18 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 19 | GNU General Public License for more details. |
| 20 | |
| 21 | You should have received a copy of the GNU General Public License |
| 22 | along with GNU Emacs; see the file COPYING. If not, write to |
| 23 | the Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| 24 | Boston, MA 02111-1307, USA. */ |
| 25 | |
| 26 | /*** TABLE OF CONTENTS *** |
| 27 | |
| 28 | 0. General comments |
| 29 | 1. Preamble |
| 30 | 2. Emacs' internal format (emacs-utf-8) handlers |
| 31 | 3. UTF-8 handlers |
| 32 | 4. UTF-16 handlers |
| 33 | 5. Charset-base coding systems handlers |
| 34 | 6. emacs-mule (old Emacs' internal format) handlers |
| 35 | 7. ISO2022 handlers |
| 36 | 8. Shift-JIS and BIG5 handlers |
| 37 | 9. CCL handlers |
| 38 | 10. C library functions |
| 39 | 11. Emacs Lisp library functions |
| 40 | 12. Postamble |
| 41 | |
| 42 | */ |
| 43 | |
| 44 | /*** 0. General comments *** |
| 45 | |
| 46 | |
| 47 | CODING SYSTEM |
| 48 | |
| 49 | Coding system is an object for a encoding mechanism that contains |
| 50 | information about how to convert byte sequence to character |
| 51 | sequences and vice versa. When we say "decode", it means converting |
| 52 | a byte sequence of a specific coding system into a character |
| 53 | sequence that is represented by Emacs' internal coding system |
| 54 | `emacs-utf-8', and when we say "encode", it means converting a |
| 55 | character sequence of emacs-utf-8 to a byte sequence of a specific |
| 56 | coding system. |
| 57 | |
| 58 | In Emacs Lisp, a coding system is represented by a Lisp symbol. In |
| 59 | C level, a coding system is represented by a vector of attributes |
| 60 | stored in the hash table Vcharset_hash_table. The conversion from a |
| 61 | coding system symbol to attributes vector is done by looking up |
| 62 | Vcharset_hash_table by the symbol. |
| 63 | |
| 64 | Coding systems are classified into the following types depending on |
| 65 | the mechanism of encoding. Here's a brief descrition about type. |
| 66 | |
| 67 | o UTF-8 |
| 68 | |
| 69 | o UTF-16 |
| 70 | |
| 71 | o Charset-base coding system |
| 72 | |
| 73 | A coding system defined by one or more (coded) character sets. |
| 74 | Decoding and encoding are done by code converter defined for each |
| 75 | character set. |
| 76 | |
| 77 | o Old Emacs' internal format (emacs-mule) |
| 78 | |
| 79 | The coding system adopted by an old versions of Emacs (20 and 21). |
| 80 | |
| 81 | o ISO2022-base coding system |
| 82 | |
| 83 | The most famous coding system for multiple character sets. X's |
| 84 | Compound Text, various EUCs (Extended Unix Code), and coding systems |
| 85 | used in the Internet communication such as ISO-2022-JP are all |
| 86 | variants of ISO2022. |
| 87 | |
| 88 | o SJIS (or Shift-JIS or MS-Kanji-Code) |
| 89 | |
| 90 | A coding system to encode character sets: ASCII, JISX0201, and |
| 91 | JISX0208. Widely used for PC's in Japan. Details are described in |
| 92 | section 8. |
| 93 | |
| 94 | o BIG5 |
| 95 | |
| 96 | A coding system to encode character sets: ASCII and Big5. Widely |
| 97 | used by Chinese (mainly in Taiwan and Hong Kong). Details are |
| 98 | described in section 8. In this file, when we write "big5" (all |
| 99 | lowercase), we mean the coding system, and when we write "Big5" |
| 100 | (capitalized), we mean the character set. |
| 101 | |
| 102 | o CCL |
| 103 | |
| 104 | If a user wants to decode/encode a text encoded in a coding system |
| 105 | not listed above, he can supply a decoder and an encoder for it in |
| 106 | CCL (Code Conversion Language) programs. Emacs executes the CCL |
| 107 | program while decoding/encoding. |
| 108 | |
| 109 | o Raw-text |
| 110 | |
| 111 | A coding system for a text containing raw eight-bit data. Emacs |
| 112 | treat each byte of source text as a character (except for |
| 113 | end-of-line conversion). |
| 114 | |
| 115 | o No-conversion |
| 116 | |
| 117 | Like raw text, but don't do end-of-line conversion. |
| 118 | |
| 119 | |
| 120 | END-OF-LINE FORMAT |
| 121 | |
| 122 | How end-of-line of a text is encoded depends on a system. For |
| 123 | instance, Unix's format is just one byte of LF (line-feed) code, |
| 124 | whereas DOS's format is two-byte sequence of `carriage-return' and |
| 125 | `line-feed' codes. MacOS's format is usually one byte of |
| 126 | `carriage-return'. |
| 127 | |
| 128 | Since text characters encoding and end-of-line encoding are |
| 129 | independent, any coding system described above can take any format |
| 130 | of end-of-line (except for no-conversion). |
| 131 | |
| 132 | STRUCT CODING_SYSTEM |
| 133 | |
| 134 | Before using a coding system for code conversion (i.e. decoding and |
| 135 | encoding), we setup a structure of type `struct coding_system'. |
| 136 | This structure keeps various information about a specific code |
| 137 | conversion (e.g. the location of source and destination data). |
| 138 | |
| 139 | */ |
| 140 | |
| 141 | /* COMMON MACROS */ |
| 142 | |
| 143 | |
| 144 | /*** GENERAL NOTES on `detect_coding_XXX ()' functions *** |
| 145 | |
| 146 | These functions check if a byte sequence specified as a source in |
| 147 | CODING conforms to the format of XXX. Return 1 if the data contains |
| 148 | a byte sequence which can be decoded into non-ASCII characters by |
| 149 | the coding system. Otherwize (i.e. the data contains only ASCII |
| 150 | characters or invalid sequence) return 0. |
| 151 | |
| 152 | It also resets some bits of an integer pointed by MASK. The macros |
| 153 | CATEGORY_MASK_XXX specifies each bit of this integer. |
| 154 | |
| 155 | Below is the template of these functions. */ |
| 156 | |
| 157 | #if 0 |
| 158 | static int |
| 159 | detect_coding_XXX (coding, mask) |
| 160 | struct coding_system *coding; |
| 161 | int *mask; |
| 162 | { |
| 163 | unsigned char *src = coding->source; |
| 164 | unsigned char *src_end = coding->source + coding->src_bytes; |
| 165 | int multibytep = coding->src_multibyte; |
| 166 | int c; |
| 167 | int found = 0; |
| 168 | ...; |
| 169 | |
| 170 | while (1) |
| 171 | { |
| 172 | /* Get one byte from the source. If the souce is exausted, jump |
| 173 | to no_more_source:. */ |
| 174 | ONE_MORE_BYTE (c); |
| 175 | /* Check if it conforms to XXX. If not, break the loop. */ |
| 176 | } |
| 177 | /* As the data is invalid for XXX, reset a proper bits. */ |
| 178 | *mask &= ~CODING_CATEGORY_XXX; |
| 179 | return 0; |
| 180 | no_more_source: |
| 181 | /* The source exausted. */ |
| 182 | if (!found) |
| 183 | /* ASCII characters only. */ |
| 184 | return 0; |
| 185 | /* Some data should be decoded into non-ASCII characters. */ |
| 186 | *mask &= CODING_CATEGORY_XXX; |
| 187 | return 1; |
| 188 | } |
| 189 | #endif |
| 190 | |
| 191 | /*** GENERAL NOTES on `decode_coding_XXX ()' functions *** |
| 192 | |
| 193 | These functions decode a byte sequence specified as a source by |
| 194 | CODING. The resulting multibyte text goes to a place pointed to by |
| 195 | CODING->charbuf, the length of which should not exceed |
| 196 | CODING->charbuf_size; |
| 197 | |
| 198 | These functions set the information of original and decoded texts in |
| 199 | CODING->consumed, CODING->consumed_char, and CODING->charbuf_used. |
| 200 | They also set CODING->result to one of CODING_RESULT_XXX indicating |
| 201 | how the decoding is finished. |
| 202 | |
| 203 | Below is the template of these functions. */ |
| 204 | |
| 205 | #if 0 |
| 206 | static void |
| 207 | decode_coding_XXXX (coding) |
| 208 | struct coding_system *coding; |
| 209 | { |
| 210 | unsigned char *src = coding->source + coding->consumed; |
| 211 | unsigned char *src_end = coding->source + coding->src_bytes; |
| 212 | /* SRC_BASE remembers the start position in source in each loop. |
| 213 | The loop will be exited when there's not enough source code, or |
| 214 | when there's no room in CHARBUF for a decoded character. */ |
| 215 | unsigned char *src_base; |
| 216 | /* A buffer to produce decoded characters. */ |
| 217 | int *charbuf = coding->charbuf; |
| 218 | int *charbuf_end = charbuf + coding->charbuf_size; |
| 219 | int multibytep = coding->src_multibyte; |
| 220 | |
| 221 | while (1) |
| 222 | { |
| 223 | src_base = src; |
| 224 | if (charbuf < charbuf_end) |
| 225 | /* No more room to produce a decoded character. */ |
| 226 | break; |
| 227 | ONE_MORE_BYTE (c); |
| 228 | /* Decode it. */ |
| 229 | } |
| 230 | |
| 231 | no_more_source: |
| 232 | if (src_base < src_end |
| 233 | && coding->mode & CODING_MODE_LAST_BLOCK) |
| 234 | /* If the source ends by partial bytes to construct a character, |
| 235 | treat them as eight-bit raw data. */ |
| 236 | while (src_base < src_end && charbuf < charbuf_end) |
| 237 | *charbuf++ = *src_base++; |
| 238 | /* Remember how many bytes and characters we consumed. If the |
| 239 | source is multibyte, the bytes and chars are not identical. */ |
| 240 | coding->consumed = coding->consumed_char = src_base - coding->source; |
| 241 | /* Remember how many characters we produced. */ |
| 242 | coding->charbuf_used = charbuf - coding->charbuf; |
| 243 | } |
| 244 | #endif |
| 245 | |
| 246 | /*** GENERAL NOTES on `encode_coding_XXX ()' functions *** |
| 247 | |
| 248 | These functions encode SRC_BYTES length text at SOURCE of Emacs' |
| 249 | internal multibyte format by CODING. The resulting byte sequence |
| 250 | goes to a place pointed to by DESTINATION, the length of which |
| 251 | should not exceed DST_BYTES. |
| 252 | |
| 253 | These functions set the information of original and encoded texts in |
| 254 | the members produced, produced_char, consumed, and consumed_char of |
| 255 | the structure *CODING. They also set the member result to one of |
| 256 | CODING_RESULT_XXX indicating how the encoding finished. |
| 257 | |
| 258 | DST_BYTES zero means that source area and destination area are |
| 259 | overlapped, which means that we can produce a encoded text until it |
| 260 | reaches at the head of not-yet-encoded source text. |
| 261 | |
| 262 | Below is a template of these functions. */ |
| 263 | #if 0 |
| 264 | static void |
| 265 | encode_coding_XXX (coding) |
| 266 | struct coding_system *coding; |
| 267 | { |
| 268 | int multibytep = coding->dst_multibyte; |
| 269 | int *charbuf = coding->charbuf; |
| 270 | int *charbuf_end = charbuf->charbuf + coding->charbuf_used; |
| 271 | unsigned char *dst = coding->destination + coding->produced; |
| 272 | unsigned char *dst_end = coding->destination + coding->dst_bytes; |
| 273 | unsigned char *adjusted_dst_end = dst_end - _MAX_BYTES_PRODUCED_IN_LOOP_; |
| 274 | int produced_chars = 0; |
| 275 | |
| 276 | for (; charbuf < charbuf_end && dst < adjusted_dst_end; charbuf++) |
| 277 | { |
| 278 | int c = *charbuf; |
| 279 | /* Encode C into DST, and increment DST. */ |
| 280 | } |
| 281 | label_no_more_destination: |
| 282 | /* How many chars and bytes we produced. */ |
| 283 | coding->produced_char += produced_chars; |
| 284 | coding->produced = dst - coding->destination; |
| 285 | } |
| 286 | #endif |
| 287 | |
| 288 | \f |
| 289 | /*** 1. Preamble ***/ |
| 290 | |
| 291 | #include <config.h> |
| 292 | #include <stdio.h> |
| 293 | |
| 294 | #include "lisp.h" |
| 295 | #include "buffer.h" |
| 296 | #include "character.h" |
| 297 | #include "charset.h" |
| 298 | #include "ccl.h" |
| 299 | #include "composite.h" |
| 300 | #include "coding.h" |
| 301 | #include "window.h" |
| 302 | |
| 303 | Lisp_Object Vcoding_system_hash_table; |
| 304 | |
| 305 | Lisp_Object Qcoding_system, Qcoding_aliases, Qeol_type; |
| 306 | Lisp_Object Qunix, Qdos, Qmac; |
| 307 | Lisp_Object Qbuffer_file_coding_system; |
| 308 | Lisp_Object Qpost_read_conversion, Qpre_write_conversion; |
| 309 | Lisp_Object Qdefault_char; |
| 310 | Lisp_Object Qno_conversion, Qundecided; |
| 311 | Lisp_Object Qcharset, Qiso_2022, Qutf_8, Qutf_16, Qshift_jis, Qbig5; |
| 312 | Lisp_Object Qutf_16_be_nosig, Qutf_16_be, Qutf_16_le_nosig, Qutf_16_le; |
| 313 | Lisp_Object Qsignature, Qendian, Qbig, Qlittle; |
| 314 | Lisp_Object Qcoding_system_history; |
| 315 | Lisp_Object Qvalid_codes; |
| 316 | |
| 317 | extern Lisp_Object Qinsert_file_contents, Qwrite_region; |
| 318 | Lisp_Object Qcall_process, Qcall_process_region, Qprocess_argument; |
| 319 | Lisp_Object Qstart_process, Qopen_network_stream; |
| 320 | Lisp_Object Qtarget_idx; |
| 321 | |
| 322 | Lisp_Object Vselect_safe_coding_system_function; |
| 323 | |
| 324 | /* Mnemonic string for each format of end-of-line. */ |
| 325 | Lisp_Object eol_mnemonic_unix, eol_mnemonic_dos, eol_mnemonic_mac; |
| 326 | /* Mnemonic string to indicate format of end-of-line is not yet |
| 327 | decided. */ |
| 328 | Lisp_Object eol_mnemonic_undecided; |
| 329 | |
| 330 | #ifdef emacs |
| 331 | |
| 332 | Lisp_Object Vcoding_system_list, Vcoding_system_alist; |
| 333 | |
| 334 | Lisp_Object Qcoding_system_p, Qcoding_system_error; |
| 335 | |
| 336 | /* Coding system emacs-mule and raw-text are for converting only |
| 337 | end-of-line format. */ |
| 338 | Lisp_Object Qemacs_mule, Qraw_text; |
| 339 | |
| 340 | /* Coding-systems are handed between Emacs Lisp programs and C internal |
| 341 | routines by the following three variables. */ |
| 342 | /* Coding-system for reading files and receiving data from process. */ |
| 343 | Lisp_Object Vcoding_system_for_read; |
| 344 | /* Coding-system for writing files and sending data to process. */ |
| 345 | Lisp_Object Vcoding_system_for_write; |
| 346 | /* Coding-system actually used in the latest I/O. */ |
| 347 | Lisp_Object Vlast_coding_system_used; |
| 348 | |
| 349 | /* A vector of length 256 which contains information about special |
| 350 | Latin codes (especially for dealing with Microsoft codes). */ |
| 351 | Lisp_Object Vlatin_extra_code_table; |
| 352 | |
| 353 | /* Flag to inhibit code conversion of end-of-line format. */ |
| 354 | int inhibit_eol_conversion; |
| 355 | |
| 356 | /* Flag to inhibit ISO2022 escape sequence detection. */ |
| 357 | int inhibit_iso_escape_detection; |
| 358 | |
| 359 | /* Flag to make buffer-file-coding-system inherit from process-coding. */ |
| 360 | int inherit_process_coding_system; |
| 361 | |
| 362 | /* Coding system to be used to encode text for terminal display. */ |
| 363 | struct coding_system terminal_coding; |
| 364 | |
| 365 | /* Coding system to be used to encode text for terminal display when |
| 366 | terminal coding system is nil. */ |
| 367 | struct coding_system safe_terminal_coding; |
| 368 | |
| 369 | /* Coding system of what is sent from terminal keyboard. */ |
| 370 | struct coding_system keyboard_coding; |
| 371 | |
| 372 | Lisp_Object Vfile_coding_system_alist; |
| 373 | Lisp_Object Vprocess_coding_system_alist; |
| 374 | Lisp_Object Vnetwork_coding_system_alist; |
| 375 | |
| 376 | Lisp_Object Vlocale_coding_system; |
| 377 | |
| 378 | #endif /* emacs */ |
| 379 | |
| 380 | /* Flag to tell if we look up translation table on character code |
| 381 | conversion. */ |
| 382 | Lisp_Object Venable_character_translation; |
| 383 | /* Standard translation table to look up on decoding (reading). */ |
| 384 | Lisp_Object Vstandard_translation_table_for_decode; |
| 385 | /* Standard translation table to look up on encoding (writing). */ |
| 386 | Lisp_Object Vstandard_translation_table_for_encode; |
| 387 | |
| 388 | Lisp_Object Qtranslation_table; |
| 389 | Lisp_Object Qtranslation_table_id; |
| 390 | Lisp_Object Qtranslation_table_for_decode; |
| 391 | Lisp_Object Qtranslation_table_for_encode; |
| 392 | |
| 393 | /* Alist of charsets vs revision number. */ |
| 394 | static Lisp_Object Vcharset_revision_table; |
| 395 | |
| 396 | /* Default coding systems used for process I/O. */ |
| 397 | Lisp_Object Vdefault_process_coding_system; |
| 398 | |
| 399 | /* Global flag to tell that we can't call post-read-conversion and |
| 400 | pre-write-conversion functions. Usually the value is zero, but it |
| 401 | is set to 1 temporarily while such functions are running. This is |
| 402 | to avoid infinite recursive call. */ |
| 403 | static int inhibit_pre_post_conversion; |
| 404 | |
| 405 | /* Char-table containing safe coding systems of each character. */ |
| 406 | Lisp_Object Vchar_coding_system_table; |
| 407 | Lisp_Object Qchar_coding_system; |
| 408 | |
| 409 | /* Two special coding systems. */ |
| 410 | Lisp_Object Vsjis_coding_system; |
| 411 | Lisp_Object Vbig5_coding_system; |
| 412 | |
| 413 | |
| 414 | static int detect_coding_utf_8 P_ ((struct coding_system *, int *)); |
| 415 | static void decode_coding_utf_8 P_ ((struct coding_system *)); |
| 416 | static int encode_coding_utf_8 P_ ((struct coding_system *)); |
| 417 | |
| 418 | static int detect_coding_utf_16 P_ ((struct coding_system *, int *)); |
| 419 | static void decode_coding_utf_16 P_ ((struct coding_system *)); |
| 420 | static int encode_coding_utf_16 P_ ((struct coding_system *)); |
| 421 | |
| 422 | static int detect_coding_iso_2022 P_ ((struct coding_system *, int *)); |
| 423 | static void decode_coding_iso_2022 P_ ((struct coding_system *)); |
| 424 | static int encode_coding_iso_2022 P_ ((struct coding_system *)); |
| 425 | |
| 426 | static int detect_coding_emacs_mule P_ ((struct coding_system *, int *)); |
| 427 | static void decode_coding_emacs_mule P_ ((struct coding_system *)); |
| 428 | static int encode_coding_emacs_mule P_ ((struct coding_system *)); |
| 429 | |
| 430 | static int detect_coding_sjis P_ ((struct coding_system *, int *)); |
| 431 | static void decode_coding_sjis P_ ((struct coding_system *)); |
| 432 | static int encode_coding_sjis P_ ((struct coding_system *)); |
| 433 | |
| 434 | static int detect_coding_big5 P_ ((struct coding_system *, int *)); |
| 435 | static void decode_coding_big5 P_ ((struct coding_system *)); |
| 436 | static int encode_coding_big5 P_ ((struct coding_system *)); |
| 437 | |
| 438 | static int detect_coding_ccl P_ ((struct coding_system *, int *)); |
| 439 | static void decode_coding_ccl P_ ((struct coding_system *)); |
| 440 | static int encode_coding_ccl P_ ((struct coding_system *)); |
| 441 | |
| 442 | static void decode_coding_raw_text P_ ((struct coding_system *)); |
| 443 | static int encode_coding_raw_text P_ ((struct coding_system *)); |
| 444 | |
| 445 | |
| 446 | /* ISO2022 section */ |
| 447 | |
| 448 | #define CODING_ISO_INITIAL(coding, reg) \ |
| 449 | (XINT (AREF (AREF (CODING_ID_ATTRS ((coding)->id), \ |
| 450 | coding_attr_iso_initial), \ |
| 451 | reg))) |
| 452 | |
| 453 | |
| 454 | #define CODING_ISO_REQUEST(coding, charset_id) \ |
| 455 | ((charset_id <= (coding)->max_charset_id \ |
| 456 | ? (coding)->safe_charsets[charset_id] \ |
| 457 | : -1)) |
| 458 | |
| 459 | |
| 460 | #define CODING_ISO_FLAGS(coding) \ |
| 461 | ((coding)->spec.iso_2022.flags) |
| 462 | #define CODING_ISO_DESIGNATION(coding, reg) \ |
| 463 | ((coding)->spec.iso_2022.current_designation[reg]) |
| 464 | #define CODING_ISO_INVOCATION(coding, plane) \ |
| 465 | ((coding)->spec.iso_2022.current_invocation[plane]) |
| 466 | #define CODING_ISO_SINGLE_SHIFTING(coding) \ |
| 467 | ((coding)->spec.iso_2022.single_shifting) |
| 468 | #define CODING_ISO_BOL(coding) \ |
| 469 | ((coding)->spec.iso_2022.bol) |
| 470 | #define CODING_ISO_INVOKED_CHARSET(coding, plane) \ |
| 471 | CODING_ISO_DESIGNATION ((coding), CODING_ISO_INVOCATION ((coding), (plane))) |
| 472 | |
| 473 | /* Control characters of ISO2022. */ |
| 474 | /* code */ /* function */ |
| 475 | #define ISO_CODE_LF 0x0A /* line-feed */ |
| 476 | #define ISO_CODE_CR 0x0D /* carriage-return */ |
| 477 | #define ISO_CODE_SO 0x0E /* shift-out */ |
| 478 | #define ISO_CODE_SI 0x0F /* shift-in */ |
| 479 | #define ISO_CODE_SS2_7 0x19 /* single-shift-2 for 7-bit code */ |
| 480 | #define ISO_CODE_ESC 0x1B /* escape */ |
| 481 | #define ISO_CODE_SS2 0x8E /* single-shift-2 */ |
| 482 | #define ISO_CODE_SS3 0x8F /* single-shift-3 */ |
| 483 | #define ISO_CODE_CSI 0x9B /* control-sequence-introducer */ |
| 484 | |
| 485 | /* All code (1-byte) of ISO2022 is classified into one of the |
| 486 | followings. */ |
| 487 | enum iso_code_class_type |
| 488 | { |
| 489 | ISO_control_0, /* Control codes in the range |
| 490 | 0x00..0x1F and 0x7F, except for the |
| 491 | following 5 codes. */ |
| 492 | ISO_carriage_return, /* ISO_CODE_CR (0x0D) */ |
| 493 | ISO_shift_out, /* ISO_CODE_SO (0x0E) */ |
| 494 | ISO_shift_in, /* ISO_CODE_SI (0x0F) */ |
| 495 | ISO_single_shift_2_7, /* ISO_CODE_SS2_7 (0x19) */ |
| 496 | ISO_escape, /* ISO_CODE_SO (0x1B) */ |
| 497 | ISO_control_1, /* Control codes in the range |
| 498 | 0x80..0x9F, except for the |
| 499 | following 3 codes. */ |
| 500 | ISO_single_shift_2, /* ISO_CODE_SS2 (0x8E) */ |
| 501 | ISO_single_shift_3, /* ISO_CODE_SS3 (0x8F) */ |
| 502 | ISO_control_sequence_introducer, /* ISO_CODE_CSI (0x9B) */ |
| 503 | ISO_0x20_or_0x7F, /* Codes of the values 0x20 or 0x7F. */ |
| 504 | ISO_graphic_plane_0, /* Graphic codes in the range 0x21..0x7E. */ |
| 505 | ISO_0xA0_or_0xFF, /* Codes of the values 0xA0 or 0xFF. */ |
| 506 | ISO_graphic_plane_1 /* Graphic codes in the range 0xA1..0xFE. */ |
| 507 | }; |
| 508 | |
| 509 | /** The macros CODING_ISO_FLAG_XXX defines a flag bit of the |
| 510 | `iso-flags' attribute of an iso2022 coding system. */ |
| 511 | |
| 512 | /* If set, produce long-form designation sequence (e.g. ESC $ ( A) |
| 513 | instead of the correct short-form sequence (e.g. ESC $ A). */ |
| 514 | #define CODING_ISO_FLAG_LONG_FORM 0x0001 |
| 515 | |
| 516 | /* If set, reset graphic planes and registers at end-of-line to the |
| 517 | initial state. */ |
| 518 | #define CODING_ISO_FLAG_RESET_AT_EOL 0x0002 |
| 519 | |
| 520 | /* If set, reset graphic planes and registers before any control |
| 521 | characters to the initial state. */ |
| 522 | #define CODING_ISO_FLAG_RESET_AT_CNTL 0x0004 |
| 523 | |
| 524 | /* If set, encode by 7-bit environment. */ |
| 525 | #define CODING_ISO_FLAG_SEVEN_BITS 0x0008 |
| 526 | |
| 527 | /* If set, use locking-shift function. */ |
| 528 | #define CODING_ISO_FLAG_LOCKING_SHIFT 0x0010 |
| 529 | |
| 530 | /* If set, use single-shift function. Overwrite |
| 531 | CODING_ISO_FLAG_LOCKING_SHIFT. */ |
| 532 | #define CODING_ISO_FLAG_SINGLE_SHIFT 0x0020 |
| 533 | |
| 534 | /* If set, use designation escape sequence. */ |
| 535 | #define CODING_ISO_FLAG_DESIGNATION 0x0040 |
| 536 | |
| 537 | /* If set, produce revision number sequence. */ |
| 538 | #define CODING_ISO_FLAG_REVISION 0x0080 |
| 539 | |
| 540 | /* If set, produce ISO6429's direction specifying sequence. */ |
| 541 | #define CODING_ISO_FLAG_DIRECTION 0x0100 |
| 542 | |
| 543 | /* If set, assume designation states are reset at beginning of line on |
| 544 | output. */ |
| 545 | #define CODING_ISO_FLAG_INIT_AT_BOL 0x0200 |
| 546 | |
| 547 | /* If set, designation sequence should be placed at beginning of line |
| 548 | on output. */ |
| 549 | #define CODING_ISO_FLAG_DESIGNATE_AT_BOL 0x0400 |
| 550 | |
| 551 | /* If set, do not encode unsafe charactes on output. */ |
| 552 | #define CODING_ISO_FLAG_SAFE 0x0800 |
| 553 | |
| 554 | /* If set, extra latin codes (128..159) are accepted as a valid code |
| 555 | on input. */ |
| 556 | #define CODING_ISO_FLAG_LATIN_EXTRA 0x1000 |
| 557 | |
| 558 | #define CODING_ISO_FLAG_COMPOSITION 0x2000 |
| 559 | |
| 560 | #define CODING_ISO_FLAG_EUC_TW_SHIFT 0x4000 |
| 561 | |
| 562 | #define CODING_ISO_FLAG_FULL_SUPPORT 0x8000 |
| 563 | |
| 564 | /* A character to be produced on output if encoding of the original |
| 565 | character is prohibited by CODING_ISO_FLAG_SAFE. */ |
| 566 | #define CODING_INHIBIT_CHARACTER_SUBSTITUTION '?' |
| 567 | |
| 568 | |
| 569 | /* UTF-16 section */ |
| 570 | #define CODING_UTF_16_BOM(coding) \ |
| 571 | ((coding)->spec.utf_16.bom) |
| 572 | |
| 573 | #define CODING_UTF_16_ENDIAN(coding) \ |
| 574 | ((coding)->spec.utf_16.endian) |
| 575 | |
| 576 | #define CODING_UTF_16_SURROGATE(coding) \ |
| 577 | ((coding)->spec.utf_16.surrogate) |
| 578 | |
| 579 | |
| 580 | /* CCL section */ |
| 581 | #define CODING_CCL_DECODER(coding) \ |
| 582 | AREF (CODING_ID_ATTRS ((coding)->id), coding_attr_ccl_decoder) |
| 583 | #define CODING_CCL_ENCODER(coding) \ |
| 584 | AREF (CODING_ID_ATTRS ((coding)->id), coding_attr_ccl_encoder) |
| 585 | #define CODING_CCL_VALIDS(coding) \ |
| 586 | (XSTRING (AREF (CODING_ID_ATTRS ((coding)->id), coding_attr_ccl_valids)) \ |
| 587 | ->data) |
| 588 | |
| 589 | /* Index for each coding category in `coding_category_table' */ |
| 590 | |
| 591 | enum coding_category |
| 592 | { |
| 593 | coding_category_iso_7, |
| 594 | coding_category_iso_7_tight, |
| 595 | coding_category_iso_8_1, |
| 596 | coding_category_iso_8_2, |
| 597 | coding_category_iso_7_else, |
| 598 | coding_category_iso_8_else, |
| 599 | coding_category_utf_8, |
| 600 | coding_category_utf_16_auto, |
| 601 | coding_category_utf_16_be, |
| 602 | coding_category_utf_16_le, |
| 603 | coding_category_utf_16_be_nosig, |
| 604 | coding_category_utf_16_le_nosig, |
| 605 | coding_category_charset, |
| 606 | coding_category_sjis, |
| 607 | coding_category_big5, |
| 608 | coding_category_ccl, |
| 609 | coding_category_emacs_mule, |
| 610 | /* All above are targets of code detection. */ |
| 611 | coding_category_raw_text, |
| 612 | coding_category_undecided, |
| 613 | coding_category_max |
| 614 | }; |
| 615 | |
| 616 | /* Definitions of flag bits used in detect_coding_XXXX. */ |
| 617 | #define CATEGORY_MASK_ISO_7 (1 << coding_category_iso_7) |
| 618 | #define CATEGORY_MASK_ISO_7_TIGHT (1 << coding_category_iso_7_tight) |
| 619 | #define CATEGORY_MASK_ISO_8_1 (1 << coding_category_iso_8_1) |
| 620 | #define CATEGORY_MASK_ISO_8_2 (1 << coding_category_iso_8_2) |
| 621 | #define CATEGORY_MASK_ISO_7_ELSE (1 << coding_category_iso_7_else) |
| 622 | #define CATEGORY_MASK_ISO_8_ELSE (1 << coding_category_iso_8_else) |
| 623 | #define CATEGORY_MASK_UTF_8 (1 << coding_category_utf_8) |
| 624 | #define CATEGORY_MASK_UTF_16_BE (1 << coding_category_utf_16_be) |
| 625 | #define CATEGORY_MASK_UTF_16_LE (1 << coding_category_utf_16_le) |
| 626 | #define CATEGORY_MASK_UTF_16_BE_NOSIG (1 << coding_category_utf_16_be_nosig) |
| 627 | #define CATEGORY_MASK_UTF_16_LE_NOSIG (1 << coding_category_utf_16_le_nosig) |
| 628 | #define CATEGORY_MASK_CHARSET (1 << coding_category_charset) |
| 629 | #define CATEGORY_MASK_SJIS (1 << coding_category_sjis) |
| 630 | #define CATEGORY_MASK_BIG5 (1 << coding_category_big5) |
| 631 | #define CATEGORY_MASK_CCL (1 << coding_category_ccl) |
| 632 | #define CATEGORY_MASK_EMACS_MULE (1 << coding_category_emacs_mule) |
| 633 | |
| 634 | /* This value is returned if detect_coding_mask () find nothing other |
| 635 | than ASCII characters. */ |
| 636 | #define CATEGORY_MASK_ANY \ |
| 637 | (CATEGORY_MASK_ISO_7 \ |
| 638 | | CATEGORY_MASK_ISO_7_TIGHT \ |
| 639 | | CATEGORY_MASK_ISO_8_1 \ |
| 640 | | CATEGORY_MASK_ISO_8_2 \ |
| 641 | | CATEGORY_MASK_ISO_7_ELSE \ |
| 642 | | CATEGORY_MASK_ISO_8_ELSE \ |
| 643 | | CATEGORY_MASK_UTF_8 \ |
| 644 | | CATEGORY_MASK_UTF_16_BE \ |
| 645 | | CATEGORY_MASK_UTF_16_LE \ |
| 646 | | CATEGORY_MASK_UTF_16_BE_NOSIG \ |
| 647 | | CATEGORY_MASK_UTF_16_LE_NOSIG \ |
| 648 | | CATEGORY_MASK_CHARSET \ |
| 649 | | CATEGORY_MASK_SJIS \ |
| 650 | | CATEGORY_MASK_BIG5 \ |
| 651 | | CATEGORY_MASK_CCL \ |
| 652 | | CATEGORY_MASK_EMACS_MULE) |
| 653 | |
| 654 | |
| 655 | #define CATEGORY_MASK_ISO_7BIT \ |
| 656 | (CATEGORY_MASK_ISO_7 | CATEGORY_MASK_ISO_7_TIGHT) |
| 657 | |
| 658 | #define CATEGORY_MASK_ISO_8BIT \ |
| 659 | (CATEGORY_MASK_ISO_8_1 | CATEGORY_MASK_ISO_8_2) |
| 660 | |
| 661 | #define CATEGORY_MASK_ISO_ELSE \ |
| 662 | (CATEGORY_MASK_ISO_7_ELSE | CATEGORY_MASK_ISO_8_ELSE) |
| 663 | |
| 664 | #define CATEGORY_MASK_ISO_ESCAPE \ |
| 665 | (CATEGORY_MASK_ISO_7 \ |
| 666 | | CATEGORY_MASK_ISO_7_TIGHT \ |
| 667 | | CATEGORY_MASK_ISO_7_ELSE \ |
| 668 | | CATEGORY_MASK_ISO_8_ELSE) |
| 669 | |
| 670 | #define CATEGORY_MASK_ISO \ |
| 671 | ( CATEGORY_MASK_ISO_7BIT \ |
| 672 | | CATEGORY_MASK_ISO_8BIT \ |
| 673 | | CATEGORY_MASK_ISO_ELSE) |
| 674 | |
| 675 | #define CATEGORY_MASK_UTF_16 \ |
| 676 | (CATEGORY_MASK_UTF_16_BE \ |
| 677 | | CATEGORY_MASK_UTF_16_LE \ |
| 678 | | CATEGORY_MASK_UTF_16_BE_NOSIG \ |
| 679 | | CATEGORY_MASK_UTF_16_LE_NOSIG) |
| 680 | |
| 681 | |
| 682 | /* List of symbols `coding-category-xxx' ordered by priority. This |
| 683 | variable is exposed to Emacs Lisp. */ |
| 684 | static Lisp_Object Vcoding_category_list; |
| 685 | |
| 686 | /* Table of coding categories (Lisp symbols). This variable is for |
| 687 | internal use oly. */ |
| 688 | static Lisp_Object Vcoding_category_table; |
| 689 | |
| 690 | /* Table of coding-categories ordered by priority. */ |
| 691 | static enum coding_category coding_priorities[coding_category_max]; |
| 692 | |
| 693 | /* Nth element is a coding context for the coding system bound to the |
| 694 | Nth coding category. */ |
| 695 | static struct coding_system coding_categories[coding_category_max]; |
| 696 | |
| 697 | static int detected_mask[coding_category_raw_text] = |
| 698 | { CATEGORY_MASK_ISO, |
| 699 | CATEGORY_MASK_ISO, |
| 700 | CATEGORY_MASK_ISO, |
| 701 | CATEGORY_MASK_ISO, |
| 702 | CATEGORY_MASK_ISO, |
| 703 | CATEGORY_MASK_ISO, |
| 704 | CATEGORY_MASK_UTF_8, |
| 705 | CATEGORY_MASK_UTF_16, |
| 706 | CATEGORY_MASK_UTF_16, |
| 707 | CATEGORY_MASK_UTF_16, |
| 708 | CATEGORY_MASK_UTF_16, |
| 709 | CATEGORY_MASK_UTF_16, |
| 710 | CATEGORY_MASK_CHARSET, |
| 711 | CATEGORY_MASK_SJIS, |
| 712 | CATEGORY_MASK_BIG5, |
| 713 | CATEGORY_MASK_CCL, |
| 714 | CATEGORY_MASK_EMACS_MULE |
| 715 | }; |
| 716 | |
| 717 | /*** Commonly used macros and functions ***/ |
| 718 | |
| 719 | #ifndef min |
| 720 | #define min(a, b) ((a) < (b) ? (a) : (b)) |
| 721 | #endif |
| 722 | #ifndef max |
| 723 | #define max(a, b) ((a) > (b) ? (a) : (b)) |
| 724 | #endif |
| 725 | |
| 726 | #define CODING_GET_INFO(coding, attrs, eol_type, charset_list) \ |
| 727 | do { \ |
| 728 | attrs = CODING_ID_ATTRS (coding->id); \ |
| 729 | eol_type = CODING_ID_EOL_TYPE (coding->id); \ |
| 730 | if (VECTORP (eol_type)) \ |
| 731 | eol_type = Qunix; \ |
| 732 | charset_list = CODING_ATTR_CHARSET_LIST (attrs); \ |
| 733 | } while (0) |
| 734 | |
| 735 | |
| 736 | /* Safely get one byte from the source text pointed by SRC which ends |
| 737 | at SRC_END, and set C to that byte. If there are not enough bytes |
| 738 | in the source, it jumps to `no_more_source'. The caller |
| 739 | should declare and set these variables appropriately in advance: |
| 740 | src, src_end, multibytep |
| 741 | */ |
| 742 | |
| 743 | #define ONE_MORE_BYTE(c) \ |
| 744 | do { \ |
| 745 | if (src == src_end) \ |
| 746 | { \ |
| 747 | if (src_base < src) \ |
| 748 | coding->result = CODING_RESULT_INSUFFICIENT_SRC; \ |
| 749 | goto no_more_source; \ |
| 750 | } \ |
| 751 | c = *src++; \ |
| 752 | if (multibytep && (c & 0x80)) \ |
| 753 | { \ |
| 754 | if ((c & 0xFE) != 0xC0) \ |
| 755 | error ("Undecodable char found"); \ |
| 756 | c = ((c & 1) << 6) | *src++; \ |
| 757 | } \ |
| 758 | consumed_chars++; \ |
| 759 | } while (0) |
| 760 | |
| 761 | |
| 762 | #define ONE_MORE_BYTE_NO_CHECK(c) \ |
| 763 | do { \ |
| 764 | c = *src++; \ |
| 765 | if (multibytep && (c & 0x80)) \ |
| 766 | { \ |
| 767 | if ((c & 0xFE) != 0xC0) \ |
| 768 | error ("Undecodable char found"); \ |
| 769 | c = ((c & 1) << 6) | *src++; \ |
| 770 | } \ |
| 771 | } while (0) |
| 772 | |
| 773 | |
| 774 | /* Store a byte C in the place pointed by DST and increment DST to the |
| 775 | next free point, and increment PRODUCED_CHARS. The caller should |
| 776 | assure that C is 0..127, and declare and set the variable `dst' |
| 777 | appropriately in advance. |
| 778 | */ |
| 779 | |
| 780 | |
| 781 | #define EMIT_ONE_ASCII_BYTE(c) \ |
| 782 | do { \ |
| 783 | produced_chars++; \ |
| 784 | *dst++ = (c); \ |
| 785 | } while (0) |
| 786 | |
| 787 | |
| 788 | /* Like EMIT_ONE_ASCII_BYTE byt store two bytes; C1 and C2. */ |
| 789 | |
| 790 | #define EMIT_TWO_ASCII_BYTES(c1, c2) \ |
| 791 | do { \ |
| 792 | produced_chars += 2; \ |
| 793 | *dst++ = (c1), *dst++ = (c2); \ |
| 794 | } while (0) |
| 795 | |
| 796 | |
| 797 | /* Store a byte C in the place pointed by DST and increment DST to the |
| 798 | next free point, and increment PRODUCED_CHARS. If MULTIBYTEP is |
| 799 | nonzero, store in an appropriate multibyte from. The caller should |
| 800 | declare and set the variables `dst' and `multibytep' appropriately |
| 801 | in advance. */ |
| 802 | |
| 803 | #define EMIT_ONE_BYTE(c) \ |
| 804 | do { \ |
| 805 | produced_chars++; \ |
| 806 | if (multibytep) \ |
| 807 | { \ |
| 808 | int ch = (c); \ |
| 809 | if (ch >= 0x80) \ |
| 810 | ch = BYTE8_TO_CHAR (ch); \ |
| 811 | CHAR_STRING_ADVANCE (ch, dst); \ |
| 812 | } \ |
| 813 | else \ |
| 814 | *dst++ = (c); \ |
| 815 | } while (0) |
| 816 | |
| 817 | |
| 818 | /* Like EMIT_ONE_BYTE, but emit two bytes; C1 and C2. */ |
| 819 | |
| 820 | #define EMIT_TWO_BYTES(c1, c2) \ |
| 821 | do { \ |
| 822 | produced_chars += 2; \ |
| 823 | if (multibytep) \ |
| 824 | { \ |
| 825 | int ch; \ |
| 826 | \ |
| 827 | ch = (c1); \ |
| 828 | if (ch >= 0x80) \ |
| 829 | ch = BYTE8_TO_CHAR (ch); \ |
| 830 | CHAR_STRING_ADVANCE (ch, dst); \ |
| 831 | ch = (c2); \ |
| 832 | if (ch >= 0x80) \ |
| 833 | ch = BYTE8_TO_CHAR (ch); \ |
| 834 | CHAR_STRING_ADVANCE (ch, dst); \ |
| 835 | } \ |
| 836 | else \ |
| 837 | { \ |
| 838 | *dst++ = (c1); \ |
| 839 | *dst++ = (c2); \ |
| 840 | } \ |
| 841 | } while (0) |
| 842 | |
| 843 | |
| 844 | #define EMIT_THREE_BYTES(c1, c2, c3) \ |
| 845 | do { \ |
| 846 | EMIT_ONE_BYTE (c1); \ |
| 847 | EMIT_TWO_BYTES (c2, c3); \ |
| 848 | } while (0) |
| 849 | |
| 850 | |
| 851 | #define EMIT_FOUR_BYTES(c1, c2, c3, c4) \ |
| 852 | do { \ |
| 853 | EMIT_TWO_BYTES (c1, c2); \ |
| 854 | EMIT_TWO_BYTES (c3, c4); \ |
| 855 | } while (0) |
| 856 | |
| 857 | |
| 858 | #define CODING_DECODE_CHAR(coding, src, src_base, src_end, charset, code, c) \ |
| 859 | do { \ |
| 860 | charset_map_loaded = 0; \ |
| 861 | c = DECODE_CHAR (charset, code); \ |
| 862 | if (charset_map_loaded) \ |
| 863 | { \ |
| 864 | unsigned char *orig = coding->source; \ |
| 865 | EMACS_INT offset; \ |
| 866 | \ |
| 867 | coding_set_source (coding); \ |
| 868 | offset = coding->source - orig; \ |
| 869 | src += offset; \ |
| 870 | src_base += offset; \ |
| 871 | src_end += offset; \ |
| 872 | } \ |
| 873 | } while (0) |
| 874 | |
| 875 | |
| 876 | #define ASSURE_DESTINATION(bytes) \ |
| 877 | do { \ |
| 878 | if (dst + (bytes) >= dst_end) \ |
| 879 | { \ |
| 880 | int more_bytes = charbuf_end - charbuf + (bytes); \ |
| 881 | \ |
| 882 | dst = alloc_destination (coding, more_bytes, dst); \ |
| 883 | dst_end = coding->destination + coding->dst_bytes; \ |
| 884 | } \ |
| 885 | } while (0) |
| 886 | |
| 887 | |
| 888 | |
| 889 | static void |
| 890 | coding_set_source (coding) |
| 891 | struct coding_system *coding; |
| 892 | { |
| 893 | if (BUFFERP (coding->src_object)) |
| 894 | { |
| 895 | if (coding->src_pos < 0) |
| 896 | coding->source = GAP_END_ADDR + coding->src_pos_byte; |
| 897 | else |
| 898 | { |
| 899 | struct buffer *buf = XBUFFER (coding->src_object); |
| 900 | EMACS_INT beg_byte = BUF_BEG_BYTE (buf); |
| 901 | EMACS_INT gpt_byte = BUF_GPT_BYTE (buf); |
| 902 | unsigned char *beg_addr = BUF_BEG_ADDR (buf); |
| 903 | |
| 904 | coding->source = beg_addr + coding->src_pos_byte - 1; |
| 905 | if (coding->src_pos_byte >= gpt_byte) |
| 906 | coding->source += BUF_GAP_SIZE (buf); |
| 907 | } |
| 908 | } |
| 909 | else if (STRINGP (coding->src_object)) |
| 910 | { |
| 911 | coding->source = (XSTRING (coding->src_object)->data |
| 912 | + coding->src_pos_byte); |
| 913 | } |
| 914 | else |
| 915 | /* Otherwise, the source is C string and is never relocated |
| 916 | automatically. Thus we don't have to update anything. */ |
| 917 | ; |
| 918 | } |
| 919 | |
| 920 | static void |
| 921 | coding_set_destination (coding) |
| 922 | struct coding_system *coding; |
| 923 | { |
| 924 | if (BUFFERP (coding->dst_object)) |
| 925 | { |
| 926 | /* We are sure that coding->dst_pos_byte is before the gap of the |
| 927 | buffer. */ |
| 928 | coding->destination = (BUF_BEG_ADDR (XBUFFER (coding->dst_object)) |
| 929 | + coding->dst_pos_byte - 1); |
| 930 | if (coding->src_pos < 0) |
| 931 | /* The source and destination is in the same buffer. */ |
| 932 | coding->dst_bytes = (GAP_END_ADDR |
| 933 | - (coding->src_bytes - coding->consumed) |
| 934 | - coding->destination); |
| 935 | else |
| 936 | coding->dst_bytes = (BUF_GAP_END_ADDR (XBUFFER (coding->dst_object)) |
| 937 | - coding->destination); |
| 938 | } |
| 939 | else |
| 940 | /* Otherwise, the destination is C string and is never relocated |
| 941 | automatically. Thus we don't have to update anything. */ |
| 942 | ; |
| 943 | } |
| 944 | |
| 945 | |
| 946 | static void |
| 947 | coding_alloc_by_realloc (coding, bytes) |
| 948 | struct coding_system *coding; |
| 949 | EMACS_INT bytes; |
| 950 | { |
| 951 | coding->destination = (unsigned char *) xrealloc (coding->destination, |
| 952 | coding->dst_bytes + bytes); |
| 953 | coding->dst_bytes += bytes; |
| 954 | } |
| 955 | |
| 956 | static void |
| 957 | coding_alloc_by_making_gap (coding, bytes) |
| 958 | struct coding_system *coding; |
| 959 | EMACS_INT bytes; |
| 960 | { |
| 961 | Lisp_Object this_buffer; |
| 962 | |
| 963 | this_buffer = Fcurrent_buffer (); |
| 964 | if (EQ (this_buffer, coding->dst_object)) |
| 965 | { |
| 966 | EMACS_INT add = coding->src_bytes - coding->consumed; |
| 967 | |
| 968 | GAP_SIZE -= add; ZV += add; Z += add; ZV_BYTE += add; Z_BYTE += add; |
| 969 | make_gap (bytes); |
| 970 | GAP_SIZE += add; ZV -= add; Z -= add; ZV_BYTE -= add; Z_BYTE -= add; |
| 971 | } |
| 972 | else |
| 973 | { |
| 974 | set_buffer_internal (XBUFFER (coding->dst_object)); |
| 975 | make_gap (bytes); |
| 976 | set_buffer_internal (XBUFFER (this_buffer)); |
| 977 | } |
| 978 | } |
| 979 | |
| 980 | |
| 981 | static unsigned char * |
| 982 | alloc_destination (coding, nbytes, dst) |
| 983 | struct coding_system *coding; |
| 984 | int nbytes; |
| 985 | unsigned char *dst; |
| 986 | { |
| 987 | EMACS_INT offset = dst - coding->destination; |
| 988 | |
| 989 | if (BUFFERP (coding->dst_object)) |
| 990 | coding_alloc_by_making_gap (coding, nbytes); |
| 991 | else |
| 992 | coding_alloc_by_realloc (coding, nbytes); |
| 993 | coding->result = CODING_RESULT_SUCCESS; |
| 994 | coding_set_destination (coding); |
| 995 | dst = coding->destination + offset; |
| 996 | return dst; |
| 997 | } |
| 998 | |
| 999 | \f |
| 1000 | /*** 2. Emacs' internal format (emacs-utf-8) ***/ |
| 1001 | |
| 1002 | |
| 1003 | |
| 1004 | \f |
| 1005 | /*** 3. UTF-8 ***/ |
| 1006 | |
| 1007 | /* See the above "GENERAL NOTES on `detect_coding_XXX ()' functions". |
| 1008 | Check if a text is encoded in UTF-8. If it is, return |
| 1009 | CATEGORY_MASK_UTF_8, else return 0. */ |
| 1010 | |
| 1011 | #define UTF_8_1_OCTET_P(c) ((c) < 0x80) |
| 1012 | #define UTF_8_EXTRA_OCTET_P(c) (((c) & 0xC0) == 0x80) |
| 1013 | #define UTF_8_2_OCTET_LEADING_P(c) (((c) & 0xE0) == 0xC0) |
| 1014 | #define UTF_8_3_OCTET_LEADING_P(c) (((c) & 0xF0) == 0xE0) |
| 1015 | #define UTF_8_4_OCTET_LEADING_P(c) (((c) & 0xF8) == 0xF0) |
| 1016 | #define UTF_8_5_OCTET_LEADING_P(c) (((c) & 0xFC) == 0xF8) |
| 1017 | |
| 1018 | static int |
| 1019 | detect_coding_utf_8 (coding, mask) |
| 1020 | struct coding_system *coding; |
| 1021 | int *mask; |
| 1022 | { |
| 1023 | unsigned char *src = coding->source, *src_base = src; |
| 1024 | unsigned char *src_end = coding->source + coding->src_bytes; |
| 1025 | int multibytep = coding->src_multibyte; |
| 1026 | int consumed_chars = 0; |
| 1027 | int found = 0; |
| 1028 | |
| 1029 | /* A coding system of this category is always ASCII compatible. */ |
| 1030 | src += coding->head_ascii; |
| 1031 | |
| 1032 | while (1) |
| 1033 | { |
| 1034 | int c, c1, c2, c3, c4; |
| 1035 | |
| 1036 | ONE_MORE_BYTE (c); |
| 1037 | if (UTF_8_1_OCTET_P (c)) |
| 1038 | continue; |
| 1039 | ONE_MORE_BYTE (c1); |
| 1040 | if (! UTF_8_EXTRA_OCTET_P (c1)) |
| 1041 | break; |
| 1042 | if (UTF_8_2_OCTET_LEADING_P (c)) |
| 1043 | { |
| 1044 | found++; |
| 1045 | continue; |
| 1046 | } |
| 1047 | ONE_MORE_BYTE (c2); |
| 1048 | if (! UTF_8_EXTRA_OCTET_P (c2)) |
| 1049 | break; |
| 1050 | if (UTF_8_3_OCTET_LEADING_P (c)) |
| 1051 | { |
| 1052 | found++; |
| 1053 | continue; |
| 1054 | } |
| 1055 | ONE_MORE_BYTE (c3); |
| 1056 | if (! UTF_8_EXTRA_OCTET_P (c3)) |
| 1057 | break; |
| 1058 | if (UTF_8_4_OCTET_LEADING_P (c)) |
| 1059 | { |
| 1060 | found++; |
| 1061 | continue; |
| 1062 | } |
| 1063 | ONE_MORE_BYTE (c4); |
| 1064 | if (! UTF_8_EXTRA_OCTET_P (c4)) |
| 1065 | break; |
| 1066 | if (UTF_8_5_OCTET_LEADING_P (c)) |
| 1067 | { |
| 1068 | found++; |
| 1069 | continue; |
| 1070 | } |
| 1071 | break; |
| 1072 | } |
| 1073 | *mask &= ~CATEGORY_MASK_UTF_8; |
| 1074 | return 0; |
| 1075 | |
| 1076 | no_more_source: |
| 1077 | if (! found) |
| 1078 | return 0; |
| 1079 | *mask &= CATEGORY_MASK_UTF_8; |
| 1080 | return 1; |
| 1081 | } |
| 1082 | |
| 1083 | |
| 1084 | static void |
| 1085 | decode_coding_utf_8 (coding) |
| 1086 | struct coding_system *coding; |
| 1087 | { |
| 1088 | unsigned char *src = coding->source + coding->consumed; |
| 1089 | unsigned char *src_end = coding->source + coding->src_bytes; |
| 1090 | unsigned char *src_base; |
| 1091 | int *charbuf = coding->charbuf; |
| 1092 | int *charbuf_end = charbuf + coding->charbuf_size; |
| 1093 | int consumed_chars = 0, consumed_chars_base; |
| 1094 | int multibytep = coding->src_multibyte; |
| 1095 | Lisp_Object attr, eol_type, charset_list; |
| 1096 | |
| 1097 | CODING_GET_INFO (coding, attr, eol_type, charset_list); |
| 1098 | |
| 1099 | while (1) |
| 1100 | { |
| 1101 | int c, c1, c2, c3, c4, c5; |
| 1102 | |
| 1103 | src_base = src; |
| 1104 | consumed_chars_base = consumed_chars; |
| 1105 | |
| 1106 | if (charbuf >= charbuf_end) |
| 1107 | break; |
| 1108 | |
| 1109 | ONE_MORE_BYTE (c1); |
| 1110 | if (UTF_8_1_OCTET_P(c1)) |
| 1111 | { |
| 1112 | c = c1; |
| 1113 | if (c == '\r') |
| 1114 | { |
| 1115 | if (EQ (eol_type, Qdos)) |
| 1116 | { |
| 1117 | if (src == src_end) |
| 1118 | goto no_more_source; |
| 1119 | if (*src == '\n') |
| 1120 | ONE_MORE_BYTE (c); |
| 1121 | } |
| 1122 | else if (EQ (eol_type, Qmac)) |
| 1123 | c = '\n'; |
| 1124 | } |
| 1125 | } |
| 1126 | else |
| 1127 | { |
| 1128 | ONE_MORE_BYTE (c2); |
| 1129 | if (! UTF_8_EXTRA_OCTET_P (c2)) |
| 1130 | goto invalid_code; |
| 1131 | if (UTF_8_2_OCTET_LEADING_P (c1)) |
| 1132 | c = ((c1 & 0x1F) << 6) | (c2 & 0x3F); |
| 1133 | else |
| 1134 | { |
| 1135 | ONE_MORE_BYTE (c3); |
| 1136 | if (! UTF_8_EXTRA_OCTET_P (c3)) |
| 1137 | goto invalid_code; |
| 1138 | if (UTF_8_3_OCTET_LEADING_P (c1)) |
| 1139 | c = (((c1 & 0xF) << 12) |
| 1140 | | ((c2 & 0x3F) << 6) | (c3 & 0x3F)); |
| 1141 | else |
| 1142 | { |
| 1143 | ONE_MORE_BYTE (c4); |
| 1144 | if (! UTF_8_EXTRA_OCTET_P (c4)) |
| 1145 | goto invalid_code; |
| 1146 | if (UTF_8_4_OCTET_LEADING_P (c1)) |
| 1147 | c = (((c1 & 0x7) << 18) | ((c2 & 0x3F) << 12) |
| 1148 | | ((c3 & 0x3F) << 6) | (c4 & 0x3F)); |
| 1149 | else |
| 1150 | { |
| 1151 | ONE_MORE_BYTE (c5); |
| 1152 | if (! UTF_8_EXTRA_OCTET_P (c5)) |
| 1153 | goto invalid_code; |
| 1154 | if (UTF_8_5_OCTET_LEADING_P (c1)) |
| 1155 | { |
| 1156 | c = (((c1 & 0x3) << 24) | ((c2 & 0x3F) << 18) |
| 1157 | | ((c3 & 0x3F) << 12) | ((c4 & 0x3F) << 6) |
| 1158 | | (c5 & 0x3F)); |
| 1159 | if (c > MAX_CHAR) |
| 1160 | goto invalid_code; |
| 1161 | } |
| 1162 | else |
| 1163 | goto invalid_code; |
| 1164 | } |
| 1165 | } |
| 1166 | } |
| 1167 | } |
| 1168 | |
| 1169 | *charbuf++ = c; |
| 1170 | continue; |
| 1171 | |
| 1172 | invalid_code: |
| 1173 | src = src_base; |
| 1174 | consumed_chars = consumed_chars_base; |
| 1175 | ONE_MORE_BYTE (c); |
| 1176 | *charbuf++ = ASCII_BYTE_P (c) ? c : BYTE8_TO_CHAR (c); |
| 1177 | coding->errors++; |
| 1178 | } |
| 1179 | |
| 1180 | no_more_source: |
| 1181 | coding->consumed_char += consumed_chars_base; |
| 1182 | coding->consumed = src_base - coding->source; |
| 1183 | coding->charbuf_used = charbuf - coding->charbuf; |
| 1184 | } |
| 1185 | |
| 1186 | |
| 1187 | static int |
| 1188 | encode_coding_utf_8 (coding) |
| 1189 | struct coding_system *coding; |
| 1190 | { |
| 1191 | int multibytep = coding->dst_multibyte; |
| 1192 | int *charbuf = coding->charbuf; |
| 1193 | int *charbuf_end = charbuf + coding->charbuf_used; |
| 1194 | unsigned char *dst = coding->destination + coding->produced; |
| 1195 | unsigned char *dst_end = coding->destination + coding->dst_bytes; |
| 1196 | int produced_chars = 0; |
| 1197 | int c; |
| 1198 | |
| 1199 | if (multibytep) |
| 1200 | { |
| 1201 | int safe_room = MAX_MULTIBYTE_LENGTH * 2; |
| 1202 | |
| 1203 | while (charbuf < charbuf_end) |
| 1204 | { |
| 1205 | unsigned char str[MAX_MULTIBYTE_LENGTH], *p, *pend = str; |
| 1206 | |
| 1207 | ASSURE_DESTINATION (safe_room); |
| 1208 | c = *charbuf++; |
| 1209 | CHAR_STRING_ADVANCE (c, pend); |
| 1210 | for (p = str; p < pend; p++) |
| 1211 | EMIT_ONE_BYTE (*p); |
| 1212 | } |
| 1213 | } |
| 1214 | else |
| 1215 | { |
| 1216 | int safe_room = MAX_MULTIBYTE_LENGTH; |
| 1217 | |
| 1218 | while (charbuf < charbuf_end) |
| 1219 | { |
| 1220 | ASSURE_DESTINATION (safe_room); |
| 1221 | c = *charbuf++; |
| 1222 | dst += CHAR_STRING (c, dst); |
| 1223 | produced_chars++; |
| 1224 | } |
| 1225 | } |
| 1226 | coding->result = CODING_RESULT_SUCCESS; |
| 1227 | coding->produced_char += produced_chars; |
| 1228 | coding->produced = dst - coding->destination; |
| 1229 | return 0; |
| 1230 | } |
| 1231 | |
| 1232 | |
| 1233 | /* See the above "GENERAL NOTES on `detect_coding_XXX ()' functions". |
| 1234 | Check if a text is encoded in UTF-16 Big Endian (endian == 1) or |
| 1235 | Little Endian (otherwise). If it is, return |
| 1236 | CATEGORY_MASK_UTF_16_BE or CATEGORY_MASK_UTF_16_LE, |
| 1237 | else return 0. */ |
| 1238 | |
| 1239 | #define UTF_16_HIGH_SURROGATE_P(val) \ |
| 1240 | (((val) & 0xFC00) == 0xD800) |
| 1241 | |
| 1242 | #define UTF_16_LOW_SURROGATE_P(val) \ |
| 1243 | (((val) & 0xFC00) == 0xDC00) |
| 1244 | |
| 1245 | #define UTF_16_INVALID_P(val) \ |
| 1246 | (((val) == 0xFFFE) \ |
| 1247 | || ((val) == 0xFFFF) \ |
| 1248 | || UTF_16_LOW_SURROGATE_P (val)) |
| 1249 | |
| 1250 | |
| 1251 | static int |
| 1252 | detect_coding_utf_16 (coding, mask) |
| 1253 | struct coding_system *coding; |
| 1254 | int *mask; |
| 1255 | { |
| 1256 | unsigned char *src = coding->source, *src_base = src; |
| 1257 | unsigned char *src_end = coding->source + coding->src_bytes; |
| 1258 | int multibytep = coding->src_multibyte; |
| 1259 | int consumed_chars = 0; |
| 1260 | int c1, c2; |
| 1261 | |
| 1262 | ONE_MORE_BYTE (c1); |
| 1263 | ONE_MORE_BYTE (c2); |
| 1264 | |
| 1265 | if ((c1 == 0xFF) && (c2 == 0xFE)) |
| 1266 | { |
| 1267 | *mask &= CATEGORY_MASK_UTF_16_LE; |
| 1268 | return 1; |
| 1269 | } |
| 1270 | else if ((c1 == 0xFE) && (c2 == 0xFF)) |
| 1271 | { |
| 1272 | *mask &= CATEGORY_MASK_UTF_16_BE; |
| 1273 | return 1; |
| 1274 | } |
| 1275 | no_more_source: |
| 1276 | return 0; |
| 1277 | } |
| 1278 | |
| 1279 | static void |
| 1280 | decode_coding_utf_16 (coding) |
| 1281 | struct coding_system *coding; |
| 1282 | { |
| 1283 | unsigned char *src = coding->source + coding->consumed; |
| 1284 | unsigned char *src_end = coding->source + coding->src_bytes; |
| 1285 | unsigned char *src_base; |
| 1286 | int *charbuf = coding->charbuf; |
| 1287 | int *charbuf_end = charbuf + coding->charbuf_size; |
| 1288 | int consumed_chars = 0, consumed_chars_base; |
| 1289 | int multibytep = coding->src_multibyte; |
| 1290 | enum utf_16_bom_type bom = CODING_UTF_16_BOM (coding); |
| 1291 | enum utf_16_endian_type endian = CODING_UTF_16_ENDIAN (coding); |
| 1292 | int surrogate = CODING_UTF_16_SURROGATE (coding); |
| 1293 | Lisp_Object attr, eol_type, charset_list; |
| 1294 | |
| 1295 | CODING_GET_INFO (coding, attr, eol_type, charset_list); |
| 1296 | |
| 1297 | if (bom != utf_16_without_bom) |
| 1298 | { |
| 1299 | int c, c1, c2; |
| 1300 | |
| 1301 | src_base = src; |
| 1302 | ONE_MORE_BYTE (c1); |
| 1303 | ONE_MORE_BYTE (c2); |
| 1304 | c = (c1 << 8) | c2; |
| 1305 | if (bom == utf_16_with_bom) |
| 1306 | { |
| 1307 | if (endian == utf_16_big_endian |
| 1308 | ? c != 0xFFFE : c != 0xFEFF) |
| 1309 | { |
| 1310 | /* We are sure that there's enouph room at CHARBUF. */ |
| 1311 | *charbuf++ = c1; |
| 1312 | *charbuf++ = c2; |
| 1313 | coding->errors++; |
| 1314 | } |
| 1315 | } |
| 1316 | else |
| 1317 | { |
| 1318 | if (c == 0xFFFE) |
| 1319 | CODING_UTF_16_ENDIAN (coding) |
| 1320 | = endian = utf_16_big_endian; |
| 1321 | else if (c == 0xFEFF) |
| 1322 | CODING_UTF_16_ENDIAN (coding) |
| 1323 | = endian = utf_16_little_endian; |
| 1324 | else |
| 1325 | { |
| 1326 | CODING_UTF_16_ENDIAN (coding) |
| 1327 | = endian = utf_16_big_endian; |
| 1328 | src = src_base; |
| 1329 | } |
| 1330 | } |
| 1331 | CODING_UTF_16_BOM (coding) = utf_16_with_bom; |
| 1332 | } |
| 1333 | |
| 1334 | while (1) |
| 1335 | { |
| 1336 | int c, c1, c2; |
| 1337 | |
| 1338 | src_base = src; |
| 1339 | consumed_chars_base = consumed_chars; |
| 1340 | |
| 1341 | if (charbuf + 2 >= charbuf_end) |
| 1342 | break; |
| 1343 | |
| 1344 | ONE_MORE_BYTE (c1); |
| 1345 | ONE_MORE_BYTE (c2); |
| 1346 | c = (endian == utf_16_big_endian |
| 1347 | ? ((c1 << 8) | c2) : ((c2 << 8) | c1)); |
| 1348 | if (surrogate) |
| 1349 | { |
| 1350 | if (! UTF_16_LOW_SURROGATE_P (c)) |
| 1351 | { |
| 1352 | if (endian == utf_16_big_endian) |
| 1353 | c1 = surrogate >> 8, c2 = surrogate & 0xFF; |
| 1354 | else |
| 1355 | c1 = surrogate & 0xFF, c2 = surrogate >> 8; |
| 1356 | *charbuf++ = c1; |
| 1357 | *charbuf++ = c2; |
| 1358 | coding->errors++; |
| 1359 | if (UTF_16_HIGH_SURROGATE_P (c)) |
| 1360 | CODING_UTF_16_SURROGATE (coding) = surrogate = c; |
| 1361 | else |
| 1362 | *charbuf++ = c; |
| 1363 | } |
| 1364 | else |
| 1365 | { |
| 1366 | c = ((surrogate - 0xD800) << 10) | (c - 0xDC00); |
| 1367 | CODING_UTF_16_SURROGATE (coding) = surrogate = 0; |
| 1368 | *charbuf++ = c; |
| 1369 | } |
| 1370 | } |
| 1371 | else |
| 1372 | { |
| 1373 | if (UTF_16_HIGH_SURROGATE_P (c)) |
| 1374 | CODING_UTF_16_SURROGATE (coding) = surrogate = c; |
| 1375 | else |
| 1376 | *charbuf++ = c; |
| 1377 | } |
| 1378 | } |
| 1379 | |
| 1380 | no_more_source: |
| 1381 | coding->consumed_char += consumed_chars_base; |
| 1382 | coding->consumed = src_base - coding->source; |
| 1383 | coding->charbuf_used = charbuf - coding->charbuf; |
| 1384 | } |
| 1385 | |
| 1386 | static int |
| 1387 | encode_coding_utf_16 (coding) |
| 1388 | struct coding_system *coding; |
| 1389 | { |
| 1390 | int multibytep = coding->dst_multibyte; |
| 1391 | int *charbuf = coding->charbuf; |
| 1392 | int *charbuf_end = charbuf + coding->charbuf_used; |
| 1393 | unsigned char *dst = coding->destination + coding->produced; |
| 1394 | unsigned char *dst_end = coding->destination + coding->dst_bytes; |
| 1395 | int safe_room = 8; |
| 1396 | enum utf_16_bom_type bom = CODING_UTF_16_BOM (coding); |
| 1397 | int big_endian = CODING_UTF_16_ENDIAN (coding) == utf_16_big_endian; |
| 1398 | int produced_chars = 0; |
| 1399 | Lisp_Object attrs, eol_type, charset_list; |
| 1400 | int c; |
| 1401 | |
| 1402 | CODING_GET_INFO (coding, attrs, eol_type, charset_list); |
| 1403 | |
| 1404 | if (bom == utf_16_with_bom) |
| 1405 | { |
| 1406 | ASSURE_DESTINATION (safe_room); |
| 1407 | if (big_endian) |
| 1408 | EMIT_TWO_BYTES (0xFF, 0xFE); |
| 1409 | else |
| 1410 | EMIT_TWO_BYTES (0xFE, 0xFF); |
| 1411 | CODING_UTF_16_BOM (coding) = utf_16_without_bom; |
| 1412 | } |
| 1413 | |
| 1414 | while (charbuf < charbuf_end) |
| 1415 | { |
| 1416 | ASSURE_DESTINATION (safe_room); |
| 1417 | c = *charbuf++; |
| 1418 | if (c >= MAX_UNICODE_CHAR) |
| 1419 | c = coding->default_char; |
| 1420 | |
| 1421 | if (c < 0x10000) |
| 1422 | { |
| 1423 | if (big_endian) |
| 1424 | EMIT_TWO_BYTES (c >> 8, c & 0xFF); |
| 1425 | else |
| 1426 | EMIT_TWO_BYTES (c & 0xFF, c >> 8); |
| 1427 | } |
| 1428 | else |
| 1429 | { |
| 1430 | int c1, c2; |
| 1431 | |
| 1432 | c -= 0x10000; |
| 1433 | c1 = (c >> 10) + 0xD800; |
| 1434 | c2 = (c & 0x3FF) + 0xDC00; |
| 1435 | if (big_endian) |
| 1436 | EMIT_FOUR_BYTES (c1 >> 8, c1 & 0xFF, c2 >> 8, c2 & 0xFF); |
| 1437 | else |
| 1438 | EMIT_FOUR_BYTES (c1 & 0xFF, c1 >> 8, c2 & 0xFF, c2 >> 8); |
| 1439 | } |
| 1440 | } |
| 1441 | coding->result = CODING_RESULT_SUCCESS; |
| 1442 | coding->produced = dst - coding->destination; |
| 1443 | coding->produced_char += produced_chars; |
| 1444 | return 0; |
| 1445 | } |
| 1446 | |
| 1447 | \f |
| 1448 | /*** 6. Old Emacs' internal format (emacs-mule) ***/ |
| 1449 | |
| 1450 | /* Emacs' internal format for representation of multiple character |
| 1451 | sets is a kind of multi-byte encoding, i.e. characters are |
| 1452 | represented by variable-length sequences of one-byte codes. |
| 1453 | |
| 1454 | ASCII characters and control characters (e.g. `tab', `newline') are |
| 1455 | represented by one-byte sequences which are their ASCII codes, in |
| 1456 | the range 0x00 through 0x7F. |
| 1457 | |
| 1458 | 8-bit characters of the range 0x80..0x9F are represented by |
| 1459 | two-byte sequences of LEADING_CODE_8_BIT_CONTROL and (their 8-bit |
| 1460 | code + 0x20). |
| 1461 | |
| 1462 | 8-bit characters of the range 0xA0..0xFF are represented by |
| 1463 | one-byte sequences which are their 8-bit code. |
| 1464 | |
| 1465 | The other characters are represented by a sequence of `base |
| 1466 | leading-code', optional `extended leading-code', and one or two |
| 1467 | `position-code's. The length of the sequence is determined by the |
| 1468 | base leading-code. Leading-code takes the range 0x81 through 0x9D, |
| 1469 | whereas extended leading-code and position-code take the range 0xA0 |
| 1470 | through 0xFF. See `charset.h' for more details about leading-code |
| 1471 | and position-code. |
| 1472 | |
| 1473 | --- CODE RANGE of Emacs' internal format --- |
| 1474 | character set range |
| 1475 | ------------- ----- |
| 1476 | ascii 0x00..0x7F |
| 1477 | eight-bit-control LEADING_CODE_8_BIT_CONTROL + 0xA0..0xBF |
| 1478 | eight-bit-graphic 0xA0..0xBF |
| 1479 | ELSE 0x81..0x9D + [0xA0..0xFF]+ |
| 1480 | --------------------------------------------- |
| 1481 | |
| 1482 | As this is the internal character representation, the format is |
| 1483 | usually not used externally (i.e. in a file or in a data sent to a |
| 1484 | process). But, it is possible to have a text externally in this |
| 1485 | format (i.e. by encoding by the coding system `emacs-mule'). |
| 1486 | |
| 1487 | In that case, a sequence of one-byte codes has a slightly different |
| 1488 | form. |
| 1489 | |
| 1490 | At first, all characters in eight-bit-control are represented by |
| 1491 | one-byte sequences which are their 8-bit code. |
| 1492 | |
| 1493 | Next, character composition data are represented by the byte |
| 1494 | sequence of the form: 0x80 METHOD BYTES CHARS COMPONENT ..., |
| 1495 | where, |
| 1496 | METHOD is 0xF0 plus one of composition method (enum |
| 1497 | composition_method), |
| 1498 | |
| 1499 | BYTES is 0xA0 plus a byte length of this composition data, |
| 1500 | |
| 1501 | CHARS is 0x20 plus a number of characters composed by this |
| 1502 | data, |
| 1503 | |
| 1504 | COMPONENTs are characters of multibye form or composition |
| 1505 | rules encoded by two-byte of ASCII codes. |
| 1506 | |
| 1507 | In addition, for backward compatibility, the following formats are |
| 1508 | also recognized as composition data on decoding. |
| 1509 | |
| 1510 | 0x80 MSEQ ... |
| 1511 | 0x80 0xFF MSEQ RULE MSEQ RULE ... MSEQ |
| 1512 | |
| 1513 | Here, |
| 1514 | MSEQ is a multibyte form but in these special format: |
| 1515 | ASCII: 0xA0 ASCII_CODE+0x80, |
| 1516 | other: LEADING_CODE+0x20 FOLLOWING-BYTE ..., |
| 1517 | RULE is a one byte code of the range 0xA0..0xF0 that |
| 1518 | represents a composition rule. |
| 1519 | */ |
| 1520 | |
| 1521 | char emacs_mule_bytes[256]; |
| 1522 | |
| 1523 | /* Leading-code followed by extended leading-code. */ |
| 1524 | #define LEADING_CODE_PRIVATE_11 0x9A /* for private DIMENSION1 of 1-column */ |
| 1525 | #define LEADING_CODE_PRIVATE_12 0x9B /* for private DIMENSION1 of 2-column */ |
| 1526 | #define LEADING_CODE_PRIVATE_21 0x9C /* for private DIMENSION2 of 1-column */ |
| 1527 | #define LEADING_CODE_PRIVATE_22 0x9D /* for private DIMENSION2 of 2-column */ |
| 1528 | |
| 1529 | |
| 1530 | int |
| 1531 | emacs_mule_char (coding, composition, nbytes, nchars) |
| 1532 | struct coding_system *coding; |
| 1533 | int composition; |
| 1534 | int *nbytes, *nchars; |
| 1535 | { |
| 1536 | unsigned char *src = coding->source + coding->consumed; |
| 1537 | unsigned char *src_end = coding->source + coding->src_bytes; |
| 1538 | int multibytep = coding->src_multibyte; |
| 1539 | unsigned char *src_base = src; |
| 1540 | struct charset *charset; |
| 1541 | unsigned code; |
| 1542 | int c; |
| 1543 | int consumed_chars = 0; |
| 1544 | |
| 1545 | ONE_MORE_BYTE (c); |
| 1546 | if (composition) |
| 1547 | { |
| 1548 | c -= 0x20; |
| 1549 | if (c == 0x80) |
| 1550 | { |
| 1551 | ONE_MORE_BYTE (c); |
| 1552 | if (c < 0xA0) |
| 1553 | goto invalid_code; |
| 1554 | *nbytes = src - src_base; |
| 1555 | *nchars = consumed_chars; |
| 1556 | return (c - 0x80); |
| 1557 | } |
| 1558 | } |
| 1559 | |
| 1560 | switch (emacs_mule_bytes[c]) |
| 1561 | { |
| 1562 | case 2: |
| 1563 | if (! (charset = emacs_mule_charset[c])) |
| 1564 | goto invalid_code; |
| 1565 | ONE_MORE_BYTE (c); |
| 1566 | code = c & 0x7F; |
| 1567 | break; |
| 1568 | |
| 1569 | case 3: |
| 1570 | if (c == LEADING_CODE_PRIVATE_11 |
| 1571 | || c == LEADING_CODE_PRIVATE_12) |
| 1572 | { |
| 1573 | ONE_MORE_BYTE (c); |
| 1574 | if (! (charset = emacs_mule_charset[c])) |
| 1575 | goto invalid_code; |
| 1576 | ONE_MORE_BYTE (c); |
| 1577 | code = c & 0x7F; |
| 1578 | } |
| 1579 | else |
| 1580 | { |
| 1581 | if (! (charset = emacs_mule_charset[c])) |
| 1582 | goto invalid_code; |
| 1583 | ONE_MORE_BYTE (c); |
| 1584 | code = (c & 0x7F) << 7; |
| 1585 | ONE_MORE_BYTE (c); |
| 1586 | code |= c & 0x7F; |
| 1587 | } |
| 1588 | break; |
| 1589 | |
| 1590 | case 4: |
| 1591 | if (! (charset = emacs_mule_charset[c])) |
| 1592 | goto invalid_code; |
| 1593 | ONE_MORE_BYTE (c); |
| 1594 | code = (c & 0x7F) << 7; |
| 1595 | ONE_MORE_BYTE (c); |
| 1596 | code |= c & 0x7F; |
| 1597 | break; |
| 1598 | |
| 1599 | case 1: |
| 1600 | code = c; |
| 1601 | charset = CHARSET_FROM_ID (ASCII_BYTE_P (code) ? charset_ascii |
| 1602 | : code < 0xA0 ? charset_8_bit_control |
| 1603 | : charset_8_bit_graphic); |
| 1604 | break; |
| 1605 | |
| 1606 | default: |
| 1607 | abort (); |
| 1608 | } |
| 1609 | c = DECODE_CHAR (charset, code); |
| 1610 | if (c < 0) |
| 1611 | goto invalid_code; |
| 1612 | *nbytes = src - src_base; |
| 1613 | *nchars = consumed_chars; |
| 1614 | return c; |
| 1615 | |
| 1616 | no_more_source: |
| 1617 | return -2; |
| 1618 | |
| 1619 | invalid_code: |
| 1620 | return -1; |
| 1621 | } |
| 1622 | |
| 1623 | |
| 1624 | /* See the above "GENERAL NOTES on `detect_coding_XXX ()' functions". |
| 1625 | Check if a text is encoded in `emacs-mule'. */ |
| 1626 | |
| 1627 | static int |
| 1628 | detect_coding_emacs_mule (coding, mask) |
| 1629 | struct coding_system *coding; |
| 1630 | int *mask; |
| 1631 | { |
| 1632 | unsigned char *src = coding->source, *src_base = src; |
| 1633 | unsigned char *src_end = coding->source + coding->src_bytes; |
| 1634 | int multibytep = coding->src_multibyte; |
| 1635 | int consumed_chars = 0; |
| 1636 | int c; |
| 1637 | int found = 0; |
| 1638 | |
| 1639 | /* A coding system of this category is always ASCII compatible. */ |
| 1640 | src += coding->head_ascii; |
| 1641 | |
| 1642 | while (1) |
| 1643 | { |
| 1644 | ONE_MORE_BYTE (c); |
| 1645 | |
| 1646 | if (c == 0x80) |
| 1647 | { |
| 1648 | /* Perhaps the start of composite character. We simple skip |
| 1649 | it because analyzing it is too heavy for detecting. But, |
| 1650 | at least, we check that the composite character |
| 1651 | constitues of more than 4 bytes. */ |
| 1652 | unsigned char *src_base; |
| 1653 | |
| 1654 | repeat: |
| 1655 | src_base = src; |
| 1656 | do |
| 1657 | { |
| 1658 | ONE_MORE_BYTE (c); |
| 1659 | } |
| 1660 | while (c >= 0xA0); |
| 1661 | |
| 1662 | if (src - src_base <= 4) |
| 1663 | break; |
| 1664 | found = 1; |
| 1665 | if (c == 0x80) |
| 1666 | goto repeat; |
| 1667 | } |
| 1668 | |
| 1669 | if (c < 0x80) |
| 1670 | { |
| 1671 | if (c < 0x20 |
| 1672 | && (c == ISO_CODE_ESC || c == ISO_CODE_SI || c == ISO_CODE_SO)) |
| 1673 | break; |
| 1674 | } |
| 1675 | else |
| 1676 | { |
| 1677 | unsigned char *src_base = src - 1; |
| 1678 | |
| 1679 | do |
| 1680 | { |
| 1681 | ONE_MORE_BYTE (c); |
| 1682 | } |
| 1683 | while (c >= 0xA0); |
| 1684 | if (src - src_base != emacs_mule_bytes[*src_base]) |
| 1685 | break; |
| 1686 | found = 1; |
| 1687 | } |
| 1688 | } |
| 1689 | *mask &= ~CATEGORY_MASK_EMACS_MULE; |
| 1690 | return 0; |
| 1691 | |
| 1692 | no_more_source: |
| 1693 | if (!found) |
| 1694 | return 0; |
| 1695 | *mask &= CATEGORY_MASK_EMACS_MULE; |
| 1696 | return 1; |
| 1697 | } |
| 1698 | |
| 1699 | |
| 1700 | /* See the above "GENERAL NOTES on `decode_coding_XXX ()' functions". */ |
| 1701 | |
| 1702 | /* Decode a character represented as a component of composition |
| 1703 | sequence of Emacs 20/21 style at SRC. Set C to that character and |
| 1704 | update SRC to the head of next character (or an encoded composition |
| 1705 | rule). If SRC doesn't points a composition component, set C to -1. |
| 1706 | If SRC points an invalid byte sequence, global exit by a return |
| 1707 | value 0. */ |
| 1708 | |
| 1709 | #define DECODE_EMACS_MULE_COMPOSITION_CHAR(buf) \ |
| 1710 | if (1) \ |
| 1711 | { \ |
| 1712 | int c; \ |
| 1713 | int nbytes, nchars; \ |
| 1714 | \ |
| 1715 | if (src == src_end) \ |
| 1716 | break; \ |
| 1717 | c = emacs_mule_char (coding, 1, &nbytes, &nchars); \ |
| 1718 | if (c < 0) \ |
| 1719 | { \ |
| 1720 | if (c == -2) \ |
| 1721 | break; \ |
| 1722 | goto invalid_code; \ |
| 1723 | } \ |
| 1724 | *buf++ = c; \ |
| 1725 | src += nbytes; \ |
| 1726 | consumed_chars += nchars; \ |
| 1727 | } \ |
| 1728 | else |
| 1729 | |
| 1730 | |
| 1731 | /* Decode a composition rule represented as a component of composition |
| 1732 | sequence of Emacs 20 style at SRC. Set C to the rule. If SRC |
| 1733 | points an invalid byte sequence, set C to -1. */ |
| 1734 | |
| 1735 | #define DECODE_EMACS_MULE_COMPOSITION_RULE(buf) \ |
| 1736 | do { \ |
| 1737 | int c, gref, nref; \ |
| 1738 | \ |
| 1739 | if (src < src_end) \ |
| 1740 | goto invalid_code; \ |
| 1741 | ONE_MORE_BYTE_NO_CHECK (c); \ |
| 1742 | c -= 0xA0; \ |
| 1743 | if (c < 0 || c >= 81) \ |
| 1744 | goto invalid_code; \ |
| 1745 | \ |
| 1746 | gref = c / 9, nref = c % 9; \ |
| 1747 | *buf++ = COMPOSITION_ENCODE_RULE (gref, nref); \ |
| 1748 | } while (0) |
| 1749 | |
| 1750 | |
| 1751 | #define ADD_COMPOSITION_DATA(buf, method, nchars) \ |
| 1752 | do { \ |
| 1753 | *buf++ = -5; \ |
| 1754 | *buf++ = coding->produced_char + char_offset; \ |
| 1755 | *buf++ = CODING_ANNOTATE_COMPOSITION_MASK; \ |
| 1756 | *buf++ = method; \ |
| 1757 | *buf++ = nchars; \ |
| 1758 | } while (0) |
| 1759 | |
| 1760 | |
| 1761 | #define DECODE_EMACS_MULE_21_COMPOSITION(c) \ |
| 1762 | do { \ |
| 1763 | /* Emacs 21 style format. The first three bytes at SRC are \ |
| 1764 | (METHOD - 0xF0), (BYTES - 0xA0), (CHARS - 0xA0), where BYTES is \ |
| 1765 | the byte length of this composition information, CHARS is the \ |
| 1766 | number of characters composed by this composition. */ \ |
| 1767 | enum composition_method method = c - 0xF0; \ |
| 1768 | int consumed_chars_limit; \ |
| 1769 | int nbytes, nchars; \ |
| 1770 | \ |
| 1771 | ONE_MORE_BYTE (c); \ |
| 1772 | nbytes = c - 0xA0; \ |
| 1773 | if (nbytes < 3) \ |
| 1774 | goto invalid_code; \ |
| 1775 | ONE_MORE_BYTE (c); \ |
| 1776 | nchars = c - 0xA0; \ |
| 1777 | ADD_COMPOSITION_DATA (charbuf, method, nchars); \ |
| 1778 | consumed_chars_limit = consumed_chars_base + nbytes; \ |
| 1779 | if (method != COMPOSITION_RELATIVE) \ |
| 1780 | { \ |
| 1781 | int i = 0; \ |
| 1782 | while (consumed_chars < consumed_chars_limit) \ |
| 1783 | { \ |
| 1784 | if (i % 2 && method != COMPOSITION_WITH_ALTCHARS) \ |
| 1785 | DECODE_EMACS_MULE_COMPOSITION_RULE (charbuf); \ |
| 1786 | else \ |
| 1787 | DECODE_EMACS_MULE_COMPOSITION_CHAR (charbuf); \ |
| 1788 | } \ |
| 1789 | if (consumed_chars < consumed_chars_limit) \ |
| 1790 | goto invalid_code; \ |
| 1791 | } \ |
| 1792 | } while (0) |
| 1793 | |
| 1794 | |
| 1795 | #define DECODE_EMACS_MULE_20_RELATIVE_COMPOSITION(c) \ |
| 1796 | do { \ |
| 1797 | /* Emacs 20 style format for relative composition. */ \ |
| 1798 | /* Store multibyte form of characters to be composed. */ \ |
| 1799 | int components[MAX_COMPOSITION_COMPONENTS * 2 - 1]; \ |
| 1800 | int *buf = components; \ |
| 1801 | int i, j; \ |
| 1802 | \ |
| 1803 | src = src_base; \ |
| 1804 | ONE_MORE_BYTE (c); /* skip 0x80 */ \ |
| 1805 | for (i = 0; i < MAX_COMPOSITION_COMPONENTS; i++) \ |
| 1806 | DECODE_EMACS_MULE_COMPOSITION_CHAR (buf); \ |
| 1807 | if (i < 2) \ |
| 1808 | goto invalid_code; \ |
| 1809 | ADD_COMPOSITION_DATA (charbuf, COMPOSITION_RELATIVE, i); \ |
| 1810 | for (j = 0; j < i; j++) \ |
| 1811 | *charbuf++ = components[j]; \ |
| 1812 | } while (0) |
| 1813 | |
| 1814 | |
| 1815 | #define DECODE_EMACS_MULE_20_RULEBASE_COMPOSITION(c) \ |
| 1816 | do { \ |
| 1817 | /* Emacs 20 style format for rule-base composition. */ \ |
| 1818 | /* Store multibyte form of characters to be composed. */ \ |
| 1819 | int components[MAX_COMPOSITION_COMPONENTS * 2 - 1]; \ |
| 1820 | int *buf = components; \ |
| 1821 | int i, j; \ |
| 1822 | \ |
| 1823 | DECODE_EMACS_MULE_COMPOSITION_CHAR (buf); \ |
| 1824 | for (i = 0; i < MAX_COMPOSITION_COMPONENTS; i++) \ |
| 1825 | { \ |
| 1826 | DECODE_EMACS_MULE_COMPOSITION_RULE (buf); \ |
| 1827 | DECODE_EMACS_MULE_COMPOSITION_CHAR (buf); \ |
| 1828 | } \ |
| 1829 | if (i < 1 || (buf - components) % 2 == 0) \ |
| 1830 | goto invalid_code; \ |
| 1831 | if (charbuf + i + (i / 2) + 1 < charbuf_end) \ |
| 1832 | goto no_more_source; \ |
| 1833 | ADD_COMPOSITION_DATA (buf, COMPOSITION_WITH_RULE, i); \ |
| 1834 | for (j = 0; j < i; j++) \ |
| 1835 | *charbuf++ = components[j]; \ |
| 1836 | for (j = 0; j < i; j += 2) \ |
| 1837 | *charbuf++ = components[j]; \ |
| 1838 | } while (0) |
| 1839 | |
| 1840 | |
| 1841 | static void |
| 1842 | decode_coding_emacs_mule (coding) |
| 1843 | struct coding_system *coding; |
| 1844 | { |
| 1845 | unsigned char *src = coding->source + coding->consumed; |
| 1846 | unsigned char *src_end = coding->source + coding->src_bytes; |
| 1847 | unsigned char *src_base; |
| 1848 | int *charbuf = coding->charbuf; |
| 1849 | int *charbuf_end = charbuf + coding->charbuf_size; |
| 1850 | int consumed_chars = 0, consumed_chars_base; |
| 1851 | int char_offset = 0; |
| 1852 | int multibytep = coding->src_multibyte; |
| 1853 | Lisp_Object attrs, eol_type, charset_list; |
| 1854 | |
| 1855 | CODING_GET_INFO (coding, attrs, eol_type, charset_list); |
| 1856 | |
| 1857 | while (1) |
| 1858 | { |
| 1859 | int c; |
| 1860 | |
| 1861 | src_base = src; |
| 1862 | consumed_chars_base = consumed_chars; |
| 1863 | |
| 1864 | if (charbuf >= charbuf_end) |
| 1865 | break; |
| 1866 | |
| 1867 | ONE_MORE_BYTE (c); |
| 1868 | |
| 1869 | if (c < 0x80) |
| 1870 | { |
| 1871 | if (c == '\r') |
| 1872 | { |
| 1873 | if (EQ (eol_type, Qdos)) |
| 1874 | { |
| 1875 | if (src == src_end) |
| 1876 | goto no_more_source; |
| 1877 | if (*src == '\n') |
| 1878 | ONE_MORE_BYTE (c); |
| 1879 | } |
| 1880 | else if (EQ (eol_type, Qmac)) |
| 1881 | c = '\n'; |
| 1882 | } |
| 1883 | *charbuf++ = c; |
| 1884 | char_offset++; |
| 1885 | } |
| 1886 | else if (c == 0x80) |
| 1887 | { |
| 1888 | if (charbuf + 5 + (MAX_COMPOSITION_COMPONENTS * 2) - 1 > charbuf_end) |
| 1889 | break; |
| 1890 | ONE_MORE_BYTE (c); |
| 1891 | if (c - 0xF0 >= COMPOSITION_RELATIVE |
| 1892 | && c - 0xF0 <= COMPOSITION_WITH_RULE_ALTCHARS) |
| 1893 | DECODE_EMACS_MULE_21_COMPOSITION (c); |
| 1894 | else if (c < 0xC0) |
| 1895 | DECODE_EMACS_MULE_20_RELATIVE_COMPOSITION (c); |
| 1896 | else if (c == 0xFF) |
| 1897 | DECODE_EMACS_MULE_20_RULEBASE_COMPOSITION (c); |
| 1898 | else |
| 1899 | goto invalid_code; |
| 1900 | } |
| 1901 | else if (c < 0xA0 && emacs_mule_bytes[c] > 1) |
| 1902 | { |
| 1903 | int nbytes, nchars; |
| 1904 | src--; |
| 1905 | c = emacs_mule_char (coding, 0, &nbytes, &nchars); |
| 1906 | if (c < 0) |
| 1907 | { |
| 1908 | if (c == -2) |
| 1909 | break; |
| 1910 | goto invalid_code; |
| 1911 | } |
| 1912 | *charbuf++ = c; |
| 1913 | char_offset++; |
| 1914 | } |
| 1915 | continue; |
| 1916 | |
| 1917 | invalid_code: |
| 1918 | src = src_base; |
| 1919 | consumed_chars = consumed_chars_base; |
| 1920 | ONE_MORE_BYTE (c); |
| 1921 | *charbuf++ = ASCII_BYTE_P (c) ? c : BYTE8_TO_CHAR (c); |
| 1922 | coding->errors++; |
| 1923 | } |
| 1924 | |
| 1925 | no_more_source: |
| 1926 | coding->consumed_char += consumed_chars_base; |
| 1927 | coding->consumed = src_base - coding->source; |
| 1928 | coding->charbuf_used = charbuf - coding->charbuf; |
| 1929 | } |
| 1930 | |
| 1931 | |
| 1932 | #define EMACS_MULE_LEADING_CODES(id, codes) \ |
| 1933 | do { \ |
| 1934 | if (id < 0xA0) \ |
| 1935 | codes[0] = id, codes[1] = 0; \ |
| 1936 | else if (id < 0xE0) \ |
| 1937 | codes[0] = 0x9A, codes[1] = id; \ |
| 1938 | else if (id < 0xF0) \ |
| 1939 | codes[0] = 0x9B, codes[1] = id; \ |
| 1940 | else if (id < 0xF5) \ |
| 1941 | codes[0] = 0x9C, codes[1] = id; \ |
| 1942 | else \ |
| 1943 | codes[0] = 0x9D, codes[1] = id; \ |
| 1944 | } while (0); |
| 1945 | |
| 1946 | |
| 1947 | static int |
| 1948 | encode_coding_emacs_mule (coding) |
| 1949 | struct coding_system *coding; |
| 1950 | { |
| 1951 | int multibytep = coding->dst_multibyte; |
| 1952 | int *charbuf = coding->charbuf; |
| 1953 | int *charbuf_end = charbuf + coding->charbuf_used; |
| 1954 | unsigned char *dst = coding->destination + coding->produced; |
| 1955 | unsigned char *dst_end = coding->destination + coding->dst_bytes; |
| 1956 | int safe_room = 8; |
| 1957 | int produced_chars = 0; |
| 1958 | Lisp_Object attrs, eol_type, charset_list; |
| 1959 | int c; |
| 1960 | |
| 1961 | CODING_GET_INFO (coding, attrs, eol_type, charset_list); |
| 1962 | |
| 1963 | while (charbuf < charbuf_end) |
| 1964 | { |
| 1965 | ASSURE_DESTINATION (safe_room); |
| 1966 | c = *charbuf++; |
| 1967 | if (ASCII_CHAR_P (c)) |
| 1968 | EMIT_ONE_ASCII_BYTE (c); |
| 1969 | else |
| 1970 | { |
| 1971 | struct charset *charset; |
| 1972 | unsigned code; |
| 1973 | int dimension; |
| 1974 | int emacs_mule_id; |
| 1975 | unsigned char leading_codes[2]; |
| 1976 | |
| 1977 | charset = char_charset (c, charset_list, &code); |
| 1978 | if (! charset) |
| 1979 | { |
| 1980 | c = coding->default_char; |
| 1981 | if (ASCII_CHAR_P (c)) |
| 1982 | { |
| 1983 | EMIT_ONE_ASCII_BYTE (c); |
| 1984 | continue; |
| 1985 | } |
| 1986 | charset = char_charset (c, charset_list, &code); |
| 1987 | } |
| 1988 | dimension = CHARSET_DIMENSION (charset); |
| 1989 | emacs_mule_id = CHARSET_EMACS_MULE_ID (charset); |
| 1990 | EMACS_MULE_LEADING_CODES (emacs_mule_id, leading_codes); |
| 1991 | EMIT_ONE_BYTE (leading_codes[0]); |
| 1992 | if (leading_codes[1]) |
| 1993 | EMIT_ONE_BYTE (leading_codes[1]); |
| 1994 | if (dimension == 1) |
| 1995 | EMIT_ONE_BYTE (code); |
| 1996 | else |
| 1997 | { |
| 1998 | EMIT_ONE_BYTE (code >> 8); |
| 1999 | EMIT_ONE_BYTE (code & 0xFF); |
| 2000 | } |
| 2001 | } |
| 2002 | } |
| 2003 | coding->result = CODING_RESULT_SUCCESS; |
| 2004 | coding->produced_char += produced_chars; |
| 2005 | coding->produced = dst - coding->destination; |
| 2006 | return 0; |
| 2007 | } |
| 2008 | |
| 2009 | \f |
| 2010 | /*** 7. ISO2022 handlers ***/ |
| 2011 | |
| 2012 | /* The following note describes the coding system ISO2022 briefly. |
| 2013 | Since the intention of this note is to help understand the |
| 2014 | functions in this file, some parts are NOT ACCURATE or OVERLY |
| 2015 | SIMPLIFIED. For thorough understanding, please refer to the |
| 2016 | original document of ISO2022. |
| 2017 | |
| 2018 | ISO2022 provides many mechanisms to encode several character sets |
| 2019 | in 7-bit and 8-bit environments. For 7-bite environments, all text |
| 2020 | is encoded using bytes less than 128. This may make the encoded |
| 2021 | text a little bit longer, but the text passes more easily through |
| 2022 | several gateways, some of which strip off MSB (Most Signigant Bit). |
| 2023 | |
| 2024 | There are two kinds of character sets: control character set and |
| 2025 | graphic character set. The former contains control characters such |
| 2026 | as `newline' and `escape' to provide control functions (control |
| 2027 | functions are also provided by escape sequences). The latter |
| 2028 | contains graphic characters such as 'A' and '-'. Emacs recognizes |
| 2029 | two control character sets and many graphic character sets. |
| 2030 | |
| 2031 | Graphic character sets are classified into one of the following |
| 2032 | four classes, according to the number of bytes (DIMENSION) and |
| 2033 | number of characters in one dimension (CHARS) of the set: |
| 2034 | - DIMENSION1_CHARS94 |
| 2035 | - DIMENSION1_CHARS96 |
| 2036 | - DIMENSION2_CHARS94 |
| 2037 | - DIMENSION2_CHARS96 |
| 2038 | |
| 2039 | In addition, each character set is assigned an identification tag, |
| 2040 | unique for each set, called "final character" (denoted as <F> |
| 2041 | hereafter). The <F> of each character set is decided by ECMA(*) |
| 2042 | when it is registered in ISO. The code range of <F> is 0x30..0x7F |
| 2043 | (0x30..0x3F are for private use only). |
| 2044 | |
| 2045 | Note (*): ECMA = European Computer Manufacturers Association |
| 2046 | |
| 2047 | Here are examples of graphic character set [NAME(<F>)]: |
| 2048 | o DIMENSION1_CHARS94 -- ASCII('B'), right-half-of-JISX0201('I'), ... |
| 2049 | o DIMENSION1_CHARS96 -- right-half-of-ISO8859-1('A'), ... |
| 2050 | o DIMENSION2_CHARS94 -- GB2312('A'), JISX0208('B'), ... |
| 2051 | o DIMENSION2_CHARS96 -- none for the moment |
| 2052 | |
| 2053 | A code area (1 byte=8 bits) is divided into 4 areas, C0, GL, C1, and GR. |
| 2054 | C0 [0x00..0x1F] -- control character plane 0 |
| 2055 | GL [0x20..0x7F] -- graphic character plane 0 |
| 2056 | C1 [0x80..0x9F] -- control character plane 1 |
| 2057 | GR [0xA0..0xFF] -- graphic character plane 1 |
| 2058 | |
| 2059 | A control character set is directly designated and invoked to C0 or |
| 2060 | C1 by an escape sequence. The most common case is that: |
| 2061 | - ISO646's control character set is designated/invoked to C0, and |
| 2062 | - ISO6429's control character set is designated/invoked to C1, |
| 2063 | and usually these designations/invocations are omitted in encoded |
| 2064 | text. In a 7-bit environment, only C0 can be used, and a control |
| 2065 | character for C1 is encoded by an appropriate escape sequence to |
| 2066 | fit into the environment. All control characters for C1 are |
| 2067 | defined to have corresponding escape sequences. |
| 2068 | |
| 2069 | A graphic character set is at first designated to one of four |
| 2070 | graphic registers (G0 through G3), then these graphic registers are |
| 2071 | invoked to GL or GR. These designations and invocations can be |
| 2072 | done independently. The most common case is that G0 is invoked to |
| 2073 | GL, G1 is invoked to GR, and ASCII is designated to G0. Usually |
| 2074 | these invocations and designations are omitted in encoded text. |
| 2075 | In a 7-bit environment, only GL can be used. |
| 2076 | |
| 2077 | When a graphic character set of CHARS94 is invoked to GL, codes |
| 2078 | 0x20 and 0x7F of the GL area work as control characters SPACE and |
| 2079 | DEL respectively, and codes 0xA0 and 0xFF of the GR area should not |
| 2080 | be used. |
| 2081 | |
| 2082 | There are two ways of invocation: locking-shift and single-shift. |
| 2083 | With locking-shift, the invocation lasts until the next different |
| 2084 | invocation, whereas with single-shift, the invocation affects the |
| 2085 | following character only and doesn't affect the locking-shift |
| 2086 | state. Invocations are done by the following control characters or |
| 2087 | escape sequences: |
| 2088 | |
| 2089 | ---------------------------------------------------------------------- |
| 2090 | abbrev function cntrl escape seq description |
| 2091 | ---------------------------------------------------------------------- |
| 2092 | SI/LS0 (shift-in) 0x0F none invoke G0 into GL |
| 2093 | SO/LS1 (shift-out) 0x0E none invoke G1 into GL |
| 2094 | LS2 (locking-shift-2) none ESC 'n' invoke G2 into GL |
| 2095 | LS3 (locking-shift-3) none ESC 'o' invoke G3 into GL |
| 2096 | LS1R (locking-shift-1 right) none ESC '~' invoke G1 into GR (*) |
| 2097 | LS2R (locking-shift-2 right) none ESC '}' invoke G2 into GR (*) |
| 2098 | LS3R (locking-shift 3 right) none ESC '|' invoke G3 into GR (*) |
| 2099 | SS2 (single-shift-2) 0x8E ESC 'N' invoke G2 for one char |
| 2100 | SS3 (single-shift-3) 0x8F ESC 'O' invoke G3 for one char |
| 2101 | ---------------------------------------------------------------------- |
| 2102 | (*) These are not used by any known coding system. |
| 2103 | |
| 2104 | Control characters for these functions are defined by macros |
| 2105 | ISO_CODE_XXX in `coding.h'. |
| 2106 | |
| 2107 | Designations are done by the following escape sequences: |
| 2108 | ---------------------------------------------------------------------- |
| 2109 | escape sequence description |
| 2110 | ---------------------------------------------------------------------- |
| 2111 | ESC '(' <F> designate DIMENSION1_CHARS94<F> to G0 |
| 2112 | ESC ')' <F> designate DIMENSION1_CHARS94<F> to G1 |
| 2113 | ESC '*' <F> designate DIMENSION1_CHARS94<F> to G2 |
| 2114 | ESC '+' <F> designate DIMENSION1_CHARS94<F> to G3 |
| 2115 | ESC ',' <F> designate DIMENSION1_CHARS96<F> to G0 (*) |
| 2116 | ESC '-' <F> designate DIMENSION1_CHARS96<F> to G1 |
| 2117 | ESC '.' <F> designate DIMENSION1_CHARS96<F> to G2 |
| 2118 | ESC '/' <F> designate DIMENSION1_CHARS96<F> to G3 |
| 2119 | ESC '$' '(' <F> designate DIMENSION2_CHARS94<F> to G0 (**) |
| 2120 | ESC '$' ')' <F> designate DIMENSION2_CHARS94<F> to G1 |
| 2121 | ESC '$' '*' <F> designate DIMENSION2_CHARS94<F> to G2 |
| 2122 | ESC '$' '+' <F> designate DIMENSION2_CHARS94<F> to G3 |
| 2123 | ESC '$' ',' <F> designate DIMENSION2_CHARS96<F> to G0 (*) |
| 2124 | ESC '$' '-' <F> designate DIMENSION2_CHARS96<F> to G1 |
| 2125 | ESC '$' '.' <F> designate DIMENSION2_CHARS96<F> to G2 |
| 2126 | ESC '$' '/' <F> designate DIMENSION2_CHARS96<F> to G3 |
| 2127 | ---------------------------------------------------------------------- |
| 2128 | |
| 2129 | In this list, "DIMENSION1_CHARS94<F>" means a graphic character set |
| 2130 | of dimension 1, chars 94, and final character <F>, etc... |
| 2131 | |
| 2132 | Note (*): Although these designations are not allowed in ISO2022, |
| 2133 | Emacs accepts them on decoding, and produces them on encoding |
| 2134 | CHARS96 character sets in a coding system which is characterized as |
| 2135 | 7-bit environment, non-locking-shift, and non-single-shift. |
| 2136 | |
| 2137 | Note (**): If <F> is '@', 'A', or 'B', the intermediate character |
| 2138 | '(' must be omitted. We refer to this as "short-form" hereafter. |
| 2139 | |
| 2140 | Now you may notice that there are a lot of ways for encoding the |
| 2141 | same multilingual text in ISO2022. Actually, there exist many |
| 2142 | coding systems such as Compound Text (used in X11's inter client |
| 2143 | communication, ISO-2022-JP (used in Japanese internet), ISO-2022-KR |
| 2144 | (used in Korean internet), EUC (Extended UNIX Code, used in Asian |
| 2145 | localized platforms), and all of these are variants of ISO2022. |
| 2146 | |
| 2147 | In addition to the above, Emacs handles two more kinds of escape |
| 2148 | sequences: ISO6429's direction specification and Emacs' private |
| 2149 | sequence for specifying character composition. |
| 2150 | |
| 2151 | ISO6429's direction specification takes the following form: |
| 2152 | o CSI ']' -- end of the current direction |
| 2153 | o CSI '0' ']' -- end of the current direction |
| 2154 | o CSI '1' ']' -- start of left-to-right text |
| 2155 | o CSI '2' ']' -- start of right-to-left text |
| 2156 | The control character CSI (0x9B: control sequence introducer) is |
| 2157 | abbreviated to the escape sequence ESC '[' in a 7-bit environment. |
| 2158 | |
| 2159 | Character composition specification takes the following form: |
| 2160 | o ESC '0' -- start relative composition |
| 2161 | o ESC '1' -- end composition |
| 2162 | o ESC '2' -- start rule-base composition (*) |
| 2163 | o ESC '3' -- start relative composition with alternate chars (**) |
| 2164 | o ESC '4' -- start rule-base composition with alternate chars (**) |
| 2165 | Since these are not standard escape sequences of any ISO standard, |
| 2166 | the use of them for these meaning is restricted to Emacs only. |
| 2167 | |
| 2168 | (*) This form is used only in Emacs 20.5 and the older versions, |
| 2169 | but the newer versions can safely decode it. |
| 2170 | (**) This form is used only in Emacs 21.1 and the newer versions, |
| 2171 | and the older versions can't decode it. |
| 2172 | |
| 2173 | Here's a list of examples usages of these composition escape |
| 2174 | sequences (categorized by `enum composition_method'). |
| 2175 | |
| 2176 | COMPOSITION_RELATIVE: |
| 2177 | ESC 0 CHAR [ CHAR ] ESC 1 |
| 2178 | COMPOSITOIN_WITH_RULE: |
| 2179 | ESC 2 CHAR [ RULE CHAR ] ESC 1 |
| 2180 | COMPOSITION_WITH_ALTCHARS: |
| 2181 | ESC 3 ALTCHAR [ ALTCHAR ] ESC 0 CHAR [ CHAR ] ESC 1 |
| 2182 | COMPOSITION_WITH_RULE_ALTCHARS: |
| 2183 | ESC 4 ALTCHAR [ RULE ALTCHAR ] ESC 0 CHAR [ CHAR ] ESC 1 */ |
| 2184 | |
| 2185 | enum iso_code_class_type iso_code_class[256]; |
| 2186 | |
| 2187 | #define SAFE_CHARSET_P(coding, id) \ |
| 2188 | ((id) <= (coding)->max_charset_id \ |
| 2189 | && (coding)->safe_charsets[id] >= 0) |
| 2190 | |
| 2191 | |
| 2192 | #define SHIFT_OUT_OK(category) \ |
| 2193 | (CODING_ISO_INITIAL (&coding_categories[category], 1) >= 0) |
| 2194 | |
| 2195 | static void |
| 2196 | setup_iso_safe_charsets (Lisp_Object attrs) |
| 2197 | { |
| 2198 | Lisp_Object charset_list, safe_charsets; |
| 2199 | Lisp_Object request; |
| 2200 | Lisp_Object reg_usage; |
| 2201 | Lisp_Object tail; |
| 2202 | int reg94, reg96; |
| 2203 | int flags = XINT (AREF (attrs, coding_attr_iso_flags)); |
| 2204 | int max_charset_id; |
| 2205 | |
| 2206 | charset_list = CODING_ATTR_CHARSET_LIST (attrs); |
| 2207 | if ((flags & CODING_ISO_FLAG_FULL_SUPPORT) |
| 2208 | && ! EQ (charset_list, Viso_2022_charset_list)) |
| 2209 | { |
| 2210 | CODING_ATTR_CHARSET_LIST (attrs) |
| 2211 | = charset_list = Viso_2022_charset_list; |
| 2212 | ASET (attrs, coding_attr_safe_charsets, Qnil); |
| 2213 | } |
| 2214 | |
| 2215 | if (STRINGP (AREF (attrs, coding_attr_safe_charsets))) |
| 2216 | return; |
| 2217 | |
| 2218 | max_charset_id = 0; |
| 2219 | for (tail = charset_list; CONSP (tail); tail = XCDR (tail)) |
| 2220 | { |
| 2221 | int id = XINT (XCAR (tail)); |
| 2222 | if (max_charset_id < id) |
| 2223 | max_charset_id = id; |
| 2224 | } |
| 2225 | |
| 2226 | safe_charsets = Fmake_string (make_number (max_charset_id + 1), |
| 2227 | make_number (255)); |
| 2228 | request = AREF (attrs, coding_attr_iso_request); |
| 2229 | reg_usage = AREF (attrs, coding_attr_iso_usage); |
| 2230 | reg94 = XINT (XCAR (reg_usage)); |
| 2231 | reg96 = XINT (XCDR (reg_usage)); |
| 2232 | |
| 2233 | for (tail = charset_list; CONSP (tail); tail = XCDR (tail)) |
| 2234 | { |
| 2235 | Lisp_Object id; |
| 2236 | Lisp_Object reg; |
| 2237 | struct charset *charset; |
| 2238 | |
| 2239 | id = XCAR (tail); |
| 2240 | charset = CHARSET_FROM_ID (XINT (id)); |
| 2241 | reg = Fcdr (Fassq (request, id)); |
| 2242 | if (! NILP (reg)) |
| 2243 | XSTRING (safe_charsets)->data[XINT (id)] = XINT (reg); |
| 2244 | else if (charset->iso_chars_96) |
| 2245 | { |
| 2246 | if (reg96 < 4) |
| 2247 | XSTRING (safe_charsets)->data[XINT (id)] = reg96; |
| 2248 | } |
| 2249 | else |
| 2250 | { |
| 2251 | if (reg94 < 4) |
| 2252 | XSTRING (safe_charsets)->data[XINT (id)] = reg94; |
| 2253 | } |
| 2254 | } |
| 2255 | ASET (attrs, coding_attr_safe_charsets, safe_charsets); |
| 2256 | } |
| 2257 | |
| 2258 | |
| 2259 | /* See the above "GENERAL NOTES on `detect_coding_XXX ()' functions". |
| 2260 | Check if a text is encoded in ISO2022. If it is, returns an |
| 2261 | integer in which appropriate flag bits any of: |
| 2262 | CATEGORY_MASK_ISO_7 |
| 2263 | CATEGORY_MASK_ISO_7_TIGHT |
| 2264 | CATEGORY_MASK_ISO_8_1 |
| 2265 | CATEGORY_MASK_ISO_8_2 |
| 2266 | CATEGORY_MASK_ISO_7_ELSE |
| 2267 | CATEGORY_MASK_ISO_8_ELSE |
| 2268 | are set. If a code which should never appear in ISO2022 is found, |
| 2269 | returns 0. */ |
| 2270 | |
| 2271 | static int |
| 2272 | detect_coding_iso_2022 (coding, mask) |
| 2273 | struct coding_system *coding; |
| 2274 | int *mask; |
| 2275 | { |
| 2276 | unsigned char *src = coding->source, *src_base = src; |
| 2277 | unsigned char *src_end = coding->source + coding->src_bytes; |
| 2278 | int multibytep = coding->src_multibyte; |
| 2279 | int mask_iso = CATEGORY_MASK_ISO; |
| 2280 | int mask_found = 0, mask_8bit_found = 0; |
| 2281 | int reg[4], shift_out = 0, single_shifting = 0; |
| 2282 | int id; |
| 2283 | int c, c1; |
| 2284 | int consumed_chars = 0; |
| 2285 | int i; |
| 2286 | |
| 2287 | for (i = coding_category_iso_7; i <= coding_category_iso_8_else; i++) |
| 2288 | { |
| 2289 | struct coding_system *this = &(coding_categories[i]); |
| 2290 | Lisp_Object attrs, val; |
| 2291 | |
| 2292 | attrs = CODING_ID_ATTRS (this->id); |
| 2293 | if (CODING_ISO_FLAGS (this) & CODING_ISO_FLAG_FULL_SUPPORT |
| 2294 | && ! EQ (CODING_ATTR_SAFE_CHARSETS (attrs), Viso_2022_charset_list)) |
| 2295 | setup_iso_safe_charsets (attrs); |
| 2296 | val = CODING_ATTR_SAFE_CHARSETS (attrs); |
| 2297 | this->max_charset_id = XSTRING (val)->size - 1; |
| 2298 | this->safe_charsets = (char *) XSTRING (val)->data; |
| 2299 | } |
| 2300 | |
| 2301 | /* A coding system of this category is always ASCII compatible. */ |
| 2302 | src += coding->head_ascii; |
| 2303 | |
| 2304 | reg[0] = charset_ascii, reg[1] = reg[2] = reg[3] = -1; |
| 2305 | while (mask_iso && src < src_end) |
| 2306 | { |
| 2307 | ONE_MORE_BYTE (c); |
| 2308 | switch (c) |
| 2309 | { |
| 2310 | case ISO_CODE_ESC: |
| 2311 | if (inhibit_iso_escape_detection) |
| 2312 | break; |
| 2313 | single_shifting = 0; |
| 2314 | ONE_MORE_BYTE (c); |
| 2315 | if (c >= '(' && c <= '/') |
| 2316 | { |
| 2317 | /* Designation sequence for a charset of dimension 1. */ |
| 2318 | ONE_MORE_BYTE (c1); |
| 2319 | if (c1 < ' ' || c1 >= 0x80 |
| 2320 | || (id = iso_charset_table[0][c >= ','][c1]) < 0) |
| 2321 | /* Invalid designation sequence. Just ignore. */ |
| 2322 | break; |
| 2323 | reg[(c - '(') % 4] = id; |
| 2324 | } |
| 2325 | else if (c == '$') |
| 2326 | { |
| 2327 | /* Designation sequence for a charset of dimension 2. */ |
| 2328 | ONE_MORE_BYTE (c); |
| 2329 | if (c >= '@' && c <= 'B') |
| 2330 | /* Designation for JISX0208.1978, GB2312, or JISX0208. */ |
| 2331 | reg[0] = id = iso_charset_table[1][0][c]; |
| 2332 | else if (c >= '(' && c <= '/') |
| 2333 | { |
| 2334 | ONE_MORE_BYTE (c1); |
| 2335 | if (c1 < ' ' || c1 >= 0x80 |
| 2336 | || (id = iso_charset_table[1][c >= ','][c1]) < 0) |
| 2337 | /* Invalid designation sequence. Just ignore. */ |
| 2338 | break; |
| 2339 | reg[(c - '(') % 4] = id; |
| 2340 | } |
| 2341 | else |
| 2342 | /* Invalid designation sequence. Just ignore. */ |
| 2343 | break; |
| 2344 | } |
| 2345 | else if (c == 'N' || c == 'O') |
| 2346 | { |
| 2347 | /* ESC <Fe> for SS2 or SS3. */ |
| 2348 | mask_iso &= CATEGORY_MASK_ISO_7_ELSE; |
| 2349 | break; |
| 2350 | } |
| 2351 | else if (c >= '0' && c <= '4') |
| 2352 | { |
| 2353 | /* ESC <Fp> for start/end composition. */ |
| 2354 | mask_found |= CATEGORY_MASK_ISO; |
| 2355 | break; |
| 2356 | } |
| 2357 | else |
| 2358 | { |
| 2359 | /* Invalid escape sequence. */ |
| 2360 | mask_iso &= ~CATEGORY_MASK_ISO_ESCAPE; |
| 2361 | break; |
| 2362 | } |
| 2363 | |
| 2364 | /* We found a valid designation sequence for CHARSET. */ |
| 2365 | mask_iso &= ~CATEGORY_MASK_ISO_8BIT; |
| 2366 | if (SAFE_CHARSET_P (&coding_categories[coding_category_iso_7], |
| 2367 | id)) |
| 2368 | mask_found |= CATEGORY_MASK_ISO_7; |
| 2369 | else |
| 2370 | mask_iso &= ~CATEGORY_MASK_ISO_7; |
| 2371 | if (SAFE_CHARSET_P (&coding_categories[coding_category_iso_7_tight], |
| 2372 | id)) |
| 2373 | mask_found |= CATEGORY_MASK_ISO_7_TIGHT; |
| 2374 | else |
| 2375 | mask_iso &= ~CATEGORY_MASK_ISO_7_TIGHT; |
| 2376 | if (SAFE_CHARSET_P (&coding_categories[coding_category_iso_7_else], |
| 2377 | id)) |
| 2378 | mask_found |= CATEGORY_MASK_ISO_7_ELSE; |
| 2379 | else |
| 2380 | mask_iso &= ~CATEGORY_MASK_ISO_7_ELSE; |
| 2381 | if (SAFE_CHARSET_P (&coding_categories[coding_category_iso_8_else], |
| 2382 | id)) |
| 2383 | mask_found |= CATEGORY_MASK_ISO_8_ELSE; |
| 2384 | else |
| 2385 | mask_iso &= ~CATEGORY_MASK_ISO_8_ELSE; |
| 2386 | break; |
| 2387 | |
| 2388 | case ISO_CODE_SO: |
| 2389 | if (inhibit_iso_escape_detection) |
| 2390 | break; |
| 2391 | single_shifting = 0; |
| 2392 | if (shift_out == 0 |
| 2393 | && (reg[1] >= 0 |
| 2394 | || SHIFT_OUT_OK (coding_category_iso_7_else) |
| 2395 | || SHIFT_OUT_OK (coding_category_iso_8_else))) |
| 2396 | { |
| 2397 | /* Locking shift out. */ |
| 2398 | mask_iso &= ~CATEGORY_MASK_ISO_7BIT; |
| 2399 | mask_found |= CATEGORY_MASK_ISO_ELSE; |
| 2400 | } |
| 2401 | break; |
| 2402 | |
| 2403 | case ISO_CODE_SI: |
| 2404 | if (inhibit_iso_escape_detection) |
| 2405 | break; |
| 2406 | single_shifting = 0; |
| 2407 | if (shift_out == 1) |
| 2408 | { |
| 2409 | /* Locking shift in. */ |
| 2410 | mask_iso &= ~CATEGORY_MASK_ISO_7BIT; |
| 2411 | mask_found |= CATEGORY_MASK_ISO_ELSE; |
| 2412 | } |
| 2413 | break; |
| 2414 | |
| 2415 | case ISO_CODE_CSI: |
| 2416 | single_shifting = 0; |
| 2417 | case ISO_CODE_SS2: |
| 2418 | case ISO_CODE_SS3: |
| 2419 | { |
| 2420 | int newmask = CATEGORY_MASK_ISO_8_ELSE; |
| 2421 | |
| 2422 | if (inhibit_iso_escape_detection) |
| 2423 | break; |
| 2424 | if (c != ISO_CODE_CSI) |
| 2425 | { |
| 2426 | if (CODING_ISO_FLAGS (&coding_categories[coding_category_iso_8_1]) |
| 2427 | & CODING_ISO_FLAG_SINGLE_SHIFT) |
| 2428 | newmask |= CATEGORY_MASK_ISO_8_1; |
| 2429 | if (CODING_ISO_FLAGS (&coding_categories[coding_category_iso_8_2]) |
| 2430 | & CODING_ISO_FLAG_SINGLE_SHIFT) |
| 2431 | newmask |= CATEGORY_MASK_ISO_8_2; |
| 2432 | single_shifting = 1; |
| 2433 | } |
| 2434 | if (VECTORP (Vlatin_extra_code_table) |
| 2435 | && !NILP (XVECTOR (Vlatin_extra_code_table)->contents[c])) |
| 2436 | { |
| 2437 | if (CODING_ISO_FLAGS (&coding_categories[coding_category_iso_8_1]) |
| 2438 | & CODING_ISO_FLAG_LATIN_EXTRA) |
| 2439 | newmask |= CATEGORY_MASK_ISO_8_1; |
| 2440 | if (CODING_ISO_FLAGS (&coding_categories[coding_category_iso_8_2]) |
| 2441 | & CODING_ISO_FLAG_LATIN_EXTRA) |
| 2442 | newmask |= CATEGORY_MASK_ISO_8_2; |
| 2443 | } |
| 2444 | mask_iso &= newmask; |
| 2445 | mask_found |= newmask; |
| 2446 | } |
| 2447 | break; |
| 2448 | |
| 2449 | default: |
| 2450 | if (c < 0x80) |
| 2451 | { |
| 2452 | single_shifting = 0; |
| 2453 | break; |
| 2454 | } |
| 2455 | else if (c < 0xA0) |
| 2456 | { |
| 2457 | single_shifting = 0; |
| 2458 | mask_8bit_found = 1; |
| 2459 | if (VECTORP (Vlatin_extra_code_table) |
| 2460 | && !NILP (XVECTOR (Vlatin_extra_code_table)->contents[c])) |
| 2461 | { |
| 2462 | int newmask = 0; |
| 2463 | |
| 2464 | if (CODING_ISO_FLAGS (&coding_categories[coding_category_iso_8_1]) |
| 2465 | & CODING_ISO_FLAG_LATIN_EXTRA) |
| 2466 | newmask |= CATEGORY_MASK_ISO_8_1; |
| 2467 | if (CODING_ISO_FLAGS (&coding_categories[coding_category_iso_8_2]) |
| 2468 | & CODING_ISO_FLAG_LATIN_EXTRA) |
| 2469 | newmask |= CATEGORY_MASK_ISO_8_2; |
| 2470 | mask_iso &= newmask; |
| 2471 | mask_found |= newmask; |
| 2472 | } |
| 2473 | else |
| 2474 | return 0; |
| 2475 | } |
| 2476 | else |
| 2477 | { |
| 2478 | mask_iso &= ~(CATEGORY_MASK_ISO_7BIT |
| 2479 | | CATEGORY_MASK_ISO_7_ELSE); |
| 2480 | mask_found |= CATEGORY_MASK_ISO_8_1; |
| 2481 | mask_8bit_found = 1; |
| 2482 | /* Check the length of succeeding codes of the range |
| 2483 | 0xA0..0FF. If the byte length is odd, we exclude |
| 2484 | CATEGORY_MASK_ISO_8_2. We can check this only |
| 2485 | when we are not single shifting. */ |
| 2486 | if (!single_shifting |
| 2487 | && mask_iso & CATEGORY_MASK_ISO_8_2) |
| 2488 | { |
| 2489 | int i = 1; |
| 2490 | while (src < src_end) |
| 2491 | { |
| 2492 | ONE_MORE_BYTE (c); |
| 2493 | if (c < 0xA0) |
| 2494 | break; |
| 2495 | i++; |
| 2496 | } |
| 2497 | |
| 2498 | if (i & 1 && src < src_end) |
| 2499 | mask_iso &= ~CATEGORY_MASK_ISO_8_2; |
| 2500 | else |
| 2501 | mask_found |= CATEGORY_MASK_ISO_8_2; |
| 2502 | } |
| 2503 | } |
| 2504 | break; |
| 2505 | } |
| 2506 | } |
| 2507 | no_more_source: |
| 2508 | if (!mask_iso) |
| 2509 | { |
| 2510 | *mask &= ~CATEGORY_MASK_ISO; |
| 2511 | return 0; |
| 2512 | } |
| 2513 | if (!mask_found) |
| 2514 | return 0; |
| 2515 | *mask &= mask_iso & mask_found; |
| 2516 | if (! mask_8bit_found) |
| 2517 | *mask &= ~(CATEGORY_MASK_ISO_8BIT | CATEGORY_MASK_ISO_8_ELSE); |
| 2518 | return 1; |
| 2519 | } |
| 2520 | |
| 2521 | |
| 2522 | /* Set designation state into CODING. */ |
| 2523 | #define DECODE_DESIGNATION(reg, dim, chars_96, final) \ |
| 2524 | do { \ |
| 2525 | int id, prev; \ |
| 2526 | \ |
| 2527 | if (final < '0' || final >= 128 \ |
| 2528 | || ((id = ISO_CHARSET_TABLE (dim, chars_96, final)) < 0) \ |
| 2529 | || !SAFE_CHARSET_P (coding, id)) \ |
| 2530 | { \ |
| 2531 | CODING_ISO_DESIGNATION (coding, reg) = -2; \ |
| 2532 | goto invalid_code; \ |
| 2533 | } \ |
| 2534 | prev = CODING_ISO_DESIGNATION (coding, reg); \ |
| 2535 | CODING_ISO_DESIGNATION (coding, reg) = id; \ |
| 2536 | /* If there was an invalid designation to REG previously, and this \ |
| 2537 | designation is ASCII to REG, we should keep this designation \ |
| 2538 | sequence. */ \ |
| 2539 | if (prev == -2 && id == charset_ascii) \ |
| 2540 | goto invalid_code; \ |
| 2541 | } while (0) |
| 2542 | |
| 2543 | |
| 2544 | #define MAYBE_FINISH_COMPOSITION() \ |
| 2545 | do { \ |
| 2546 | int i; \ |
| 2547 | if (composition_state == COMPOSING_NO) \ |
| 2548 | break; \ |
| 2549 | /* It is assured that we have enough room for producing \ |
| 2550 | characters stored in the table `components'. */ \ |
| 2551 | if (charbuf + component_idx > charbuf_end) \ |
| 2552 | goto no_more_source; \ |
| 2553 | composition_state = COMPOSING_NO; \ |
| 2554 | if (method == COMPOSITION_RELATIVE \ |
| 2555 | || method == COMPOSITION_WITH_ALTCHARS) \ |
| 2556 | { \ |
| 2557 | for (i = 0; i < component_idx; i++) \ |
| 2558 | *charbuf++ = components[i]; \ |
| 2559 | char_offset += component_idx; \ |
| 2560 | } \ |
| 2561 | else \ |
| 2562 | { \ |
| 2563 | for (i = 0; i < component_idx; i += 2) \ |
| 2564 | *charbuf++ = components[i]; \ |
| 2565 | char_offset += (component_idx / 2) + 1; \ |
| 2566 | } \ |
| 2567 | } while (0) |
| 2568 | |
| 2569 | |
| 2570 | /* Handle composition start sequence ESC 0, ESC 2, ESC 3, or ESC 4. |
| 2571 | ESC 0 : relative composition : ESC 0 CHAR ... ESC 1 |
| 2572 | ESC 2 : rulebase composition : ESC 2 CHAR RULE CHAR RULE ... CHAR ESC 1 |
| 2573 | ESC 3 : altchar composition : ESC 3 CHAR ... ESC 0 CHAR ... ESC 1 |
| 2574 | ESC 4 : alt&rule composition : ESC 4 CHAR RULE ... CHAR ESC 0 CHAR ... ESC 1 |
| 2575 | */ |
| 2576 | |
| 2577 | #define DECODE_COMPOSITION_START(c1) \ |
| 2578 | do { \ |
| 2579 | if (c1 == '0' \ |
| 2580 | && composition_state == COMPOSING_COMPONENT_CHAR) \ |
| 2581 | { \ |
| 2582 | component_len = component_idx; \ |
| 2583 | composition_state = COMPOSING_CHAR; \ |
| 2584 | } \ |
| 2585 | else \ |
| 2586 | { \ |
| 2587 | unsigned char *p; \ |
| 2588 | \ |
| 2589 | MAYBE_FINISH_COMPOSITION (); \ |
| 2590 | if (charbuf + MAX_COMPOSITION_COMPONENTS > charbuf_end) \ |
| 2591 | goto no_more_source; \ |
| 2592 | for (p = src; p < src_end - 1; p++) \ |
| 2593 | if (*p == ISO_CODE_ESC && p[1] == '1') \ |
| 2594 | break; \ |
| 2595 | if (p == src_end - 1) \ |
| 2596 | { \ |
| 2597 | if (coding->mode & CODING_MODE_LAST_BLOCK) \ |
| 2598 | goto invalid_code; \ |
| 2599 | goto no_more_source; \ |
| 2600 | } \ |
| 2601 | \ |
| 2602 | /* This is surely the start of a composition. */ \ |
| 2603 | method = (c1 == '0' ? COMPOSITION_RELATIVE \ |
| 2604 | : c1 == '2' ? COMPOSITION_WITH_RULE \ |
| 2605 | : c1 == '3' ? COMPOSITION_WITH_ALTCHARS \ |
| 2606 | : COMPOSITION_WITH_RULE_ALTCHARS); \ |
| 2607 | composition_state = (c1 <= '2' ? COMPOSING_CHAR \ |
| 2608 | : COMPOSING_COMPONENT_CHAR); \ |
| 2609 | component_idx = component_len = 0; \ |
| 2610 | } \ |
| 2611 | } while (0) |
| 2612 | |
| 2613 | |
| 2614 | /* Handle compositoin end sequence ESC 1. */ |
| 2615 | |
| 2616 | #define DECODE_COMPOSITION_END() \ |
| 2617 | do { \ |
| 2618 | int nchars = (component_len > 0 ? component_idx - component_len \ |
| 2619 | : method == COMPOSITION_RELATIVE ? component_idx \ |
| 2620 | : (component_idx + 1) / 2); \ |
| 2621 | int i; \ |
| 2622 | int *saved_charbuf = charbuf; \ |
| 2623 | \ |
| 2624 | ADD_COMPOSITION_DATA (charbuf, method, nchars); \ |
| 2625 | if (method != COMPOSITION_RELATIVE) \ |
| 2626 | { \ |
| 2627 | if (component_len == 0) \ |
| 2628 | for (i = 0; i < component_idx; i++) \ |
| 2629 | *charbuf++ = components[i]; \ |
| 2630 | else \ |
| 2631 | for (i = 0; i < component_len; i++) \ |
| 2632 | *charbuf++ = components[i]; \ |
| 2633 | *saved_charbuf = saved_charbuf - charbuf; \ |
| 2634 | } \ |
| 2635 | if (method == COMPOSITION_WITH_RULE) \ |
| 2636 | for (i = 0; i < component_idx; i += 2, char_offset++) \ |
| 2637 | *charbuf++ = components[i]; \ |
| 2638 | else \ |
| 2639 | for (i = component_len; i < component_idx; i++, char_offset++) \ |
| 2640 | *charbuf++ = components[i]; \ |
| 2641 | coding->annotated = 1; \ |
| 2642 | composition_state = COMPOSING_NO; \ |
| 2643 | } while (0) |
| 2644 | |
| 2645 | |
| 2646 | /* Decode a composition rule from the byte C1 (and maybe one more byte |
| 2647 | from SRC) and store one encoded composition rule in |
| 2648 | coding->cmp_data. */ |
| 2649 | |
| 2650 | #define DECODE_COMPOSITION_RULE(c1) \ |
| 2651 | do { \ |
| 2652 | (c1) -= 32; \ |
| 2653 | if (c1 < 81) /* old format (before ver.21) */ \ |
| 2654 | { \ |
| 2655 | int gref = (c1) / 9; \ |
| 2656 | int nref = (c1) % 9; \ |
| 2657 | if (gref == 4) gref = 10; \ |
| 2658 | if (nref == 4) nref = 10; \ |
| 2659 | c1 = COMPOSITION_ENCODE_RULE (gref, nref); \ |
| 2660 | } \ |
| 2661 | else if (c1 < 93) /* new format (after ver.21) */ \ |
| 2662 | { \ |
| 2663 | ONE_MORE_BYTE (c2); \ |
| 2664 | c1 = COMPOSITION_ENCODE_RULE (c1 - 81, c2 - 32); \ |
| 2665 | } \ |
| 2666 | else \ |
| 2667 | c1 = 0; \ |
| 2668 | } while (0) |
| 2669 | |
| 2670 | |
| 2671 | /* See the above "GENERAL NOTES on `decode_coding_XXX ()' functions". */ |
| 2672 | |
| 2673 | static void |
| 2674 | decode_coding_iso_2022 (coding) |
| 2675 | struct coding_system *coding; |
| 2676 | { |
| 2677 | unsigned char *src = coding->source + coding->consumed; |
| 2678 | unsigned char *src_end = coding->source + coding->src_bytes; |
| 2679 | unsigned char *src_base; |
| 2680 | int *charbuf = coding->charbuf; |
| 2681 | int *charbuf_end = charbuf + coding->charbuf_size - 4; |
| 2682 | int consumed_chars = 0, consumed_chars_base; |
| 2683 | int char_offset = 0; |
| 2684 | int multibytep = coding->src_multibyte; |
| 2685 | /* Charsets invoked to graphic plane 0 and 1 respectively. */ |
| 2686 | int charset_id_0 = CODING_ISO_INVOKED_CHARSET (coding, 0); |
| 2687 | int charset_id_1 = CODING_ISO_INVOKED_CHARSET (coding, 1); |
| 2688 | struct charset *charset; |
| 2689 | int c; |
| 2690 | /* For handling composition sequence. */ |
| 2691 | #define COMPOSING_NO 0 |
| 2692 | #define COMPOSING_CHAR 1 |
| 2693 | #define COMPOSING_RULE 2 |
| 2694 | #define COMPOSING_COMPONENT_CHAR 3 |
| 2695 | #define COMPOSING_COMPONENT_RULE 4 |
| 2696 | |
| 2697 | int composition_state = COMPOSING_NO; |
| 2698 | enum composition_method method; |
| 2699 | int components[MAX_COMPOSITION_COMPONENTS * 2 + 1]; |
| 2700 | int component_idx; |
| 2701 | int component_len; |
| 2702 | Lisp_Object attrs, eol_type, charset_list; |
| 2703 | |
| 2704 | CODING_GET_INFO (coding, attrs, eol_type, charset_list); |
| 2705 | setup_iso_safe_charsets (attrs); |
| 2706 | |
| 2707 | while (1) |
| 2708 | { |
| 2709 | int c1, c2; |
| 2710 | |
| 2711 | src_base = src; |
| 2712 | consumed_chars_base = consumed_chars; |
| 2713 | |
| 2714 | if (charbuf >= charbuf_end) |
| 2715 | break; |
| 2716 | |
| 2717 | ONE_MORE_BYTE (c1); |
| 2718 | |
| 2719 | /* We produce no character or one character. */ |
| 2720 | switch (iso_code_class [c1]) |
| 2721 | { |
| 2722 | case ISO_0x20_or_0x7F: |
| 2723 | if (composition_state != COMPOSING_NO) |
| 2724 | { |
| 2725 | if (composition_state == COMPOSING_RULE |
| 2726 | || composition_state == COMPOSING_COMPONENT_RULE) |
| 2727 | { |
| 2728 | DECODE_COMPOSITION_RULE (c1); |
| 2729 | components[component_idx++] = c1; |
| 2730 | composition_state--; |
| 2731 | continue; |
| 2732 | } |
| 2733 | else if (method == COMPOSITION_WITH_RULE) |
| 2734 | composition_state = COMPOSING_RULE; |
| 2735 | else if (method == COMPOSITION_WITH_RULE_ALTCHARS |
| 2736 | && composition_state == COMPOSING_COMPONENT_CHAR) |
| 2737 | composition_state = COMPOSING_COMPONENT_CHAR; |
| 2738 | } |
| 2739 | if (charset_id_0 < 0 |
| 2740 | || ! CHARSET_ISO_CHARS_96 (CHARSET_FROM_ID (charset_id_0))) |
| 2741 | { |
| 2742 | /* This is SPACE or DEL. */ |
| 2743 | charset = CHARSET_FROM_ID (charset_ascii); |
| 2744 | break; |
| 2745 | } |
| 2746 | /* This is a graphic character, we fall down ... */ |
| 2747 | |
| 2748 | case ISO_graphic_plane_0: |
| 2749 | if (composition_state == COMPOSING_RULE) |
| 2750 | { |
| 2751 | DECODE_COMPOSITION_RULE (c1); |
| 2752 | components[component_idx++] = c1; |
| 2753 | composition_state = COMPOSING_CHAR; |
| 2754 | } |
| 2755 | charset = CHARSET_FROM_ID (charset_id_0); |
| 2756 | break; |
| 2757 | |
| 2758 | case ISO_0xA0_or_0xFF: |
| 2759 | if (charset_id_1 < 0 |
| 2760 | || ! CHARSET_ISO_CHARS_96 (CHARSET_FROM_ID (charset_id_1)) |
| 2761 | || CODING_ISO_FLAGS (coding) & CODING_ISO_FLAG_SEVEN_BITS) |
| 2762 | goto invalid_code; |
| 2763 | /* This is a graphic character, we fall down ... */ |
| 2764 | |
| 2765 | case ISO_graphic_plane_1: |
| 2766 | if (charset_id_1 < 0) |
| 2767 | goto invalid_code; |
| 2768 | charset = CHARSET_FROM_ID (charset_id_1); |
| 2769 | break; |
| 2770 | |
| 2771 | case ISO_carriage_return: |
| 2772 | if (c1 == '\r') |
| 2773 | { |
| 2774 | if (EQ (eol_type, Qdos)) |
| 2775 | { |
| 2776 | if (src == src_end) |
| 2777 | goto no_more_source; |
| 2778 | if (*src == '\n') |
| 2779 | ONE_MORE_BYTE (c1); |
| 2780 | } |
| 2781 | else if (EQ (eol_type, Qmac)) |
| 2782 | c1 = '\n'; |
| 2783 | } |
| 2784 | /* fall through */ |
| 2785 | |
| 2786 | case ISO_control_0: |
| 2787 | MAYBE_FINISH_COMPOSITION (); |
| 2788 | charset = CHARSET_FROM_ID (charset_ascii); |
| 2789 | break; |
| 2790 | |
| 2791 | case ISO_control_1: |
| 2792 | MAYBE_FINISH_COMPOSITION (); |
| 2793 | goto invalid_code; |
| 2794 | |
| 2795 | case ISO_shift_out: |
| 2796 | if (! (CODING_ISO_FLAGS (coding) & CODING_ISO_FLAG_LOCKING_SHIFT) |
| 2797 | || CODING_ISO_DESIGNATION (coding, 1) < 0) |
| 2798 | goto invalid_code; |
| 2799 | CODING_ISO_INVOCATION (coding, 0) = 1; |
| 2800 | charset_id_0 = CODING_ISO_INVOKED_CHARSET (coding, 0); |
| 2801 | continue; |
| 2802 | |
| 2803 | case ISO_shift_in: |
| 2804 | if (! (CODING_ISO_FLAGS (coding) & CODING_ISO_FLAG_LOCKING_SHIFT)) |
| 2805 | goto invalid_code; |
| 2806 | CODING_ISO_INVOCATION (coding, 0) = 0; |
| 2807 | charset_id_0 = CODING_ISO_INVOKED_CHARSET (coding, 0); |
| 2808 | continue; |
| 2809 | |
| 2810 | case ISO_single_shift_2_7: |
| 2811 | case ISO_single_shift_2: |
| 2812 | if (! (CODING_ISO_FLAGS (coding) & CODING_ISO_FLAG_SINGLE_SHIFT)) |
| 2813 | goto invalid_code; |
| 2814 | /* SS2 is handled as an escape sequence of ESC 'N' */ |
| 2815 | c1 = 'N'; |
| 2816 | goto label_escape_sequence; |
| 2817 | |
| 2818 | case ISO_single_shift_3: |
| 2819 | if (! (CODING_ISO_FLAGS (coding) & CODING_ISO_FLAG_SINGLE_SHIFT)) |
| 2820 | goto invalid_code; |
| 2821 | /* SS2 is handled as an escape sequence of ESC 'O' */ |
| 2822 | c1 = 'O'; |
| 2823 | goto label_escape_sequence; |
| 2824 | |
| 2825 | case ISO_control_sequence_introducer: |
| 2826 | /* CSI is handled as an escape sequence of ESC '[' ... */ |
| 2827 | c1 = '['; |
| 2828 | goto label_escape_sequence; |
| 2829 | |
| 2830 | case ISO_escape: |
| 2831 | ONE_MORE_BYTE (c1); |
| 2832 | label_escape_sequence: |
| 2833 | /* Escape sequences handled here are invocation, |
| 2834 | designation, direction specification, and character |
| 2835 | composition specification. */ |
| 2836 | switch (c1) |
| 2837 | { |
| 2838 | case '&': /* revision of following character set */ |
| 2839 | ONE_MORE_BYTE (c1); |
| 2840 | if (!(c1 >= '@' && c1 <= '~')) |
| 2841 | goto invalid_code; |
| 2842 | ONE_MORE_BYTE (c1); |
| 2843 | if (c1 != ISO_CODE_ESC) |
| 2844 | goto invalid_code; |
| 2845 | ONE_MORE_BYTE (c1); |
| 2846 | goto label_escape_sequence; |
| 2847 | |
| 2848 | case '$': /* designation of 2-byte character set */ |
| 2849 | if (! (CODING_ISO_FLAGS (coding) & CODING_ISO_FLAG_DESIGNATION)) |
| 2850 | goto invalid_code; |
| 2851 | ONE_MORE_BYTE (c1); |
| 2852 | if (c1 >= '@' && c1 <= 'B') |
| 2853 | { /* designation of JISX0208.1978, GB2312.1980, |
| 2854 | or JISX0208.1980 */ |
| 2855 | DECODE_DESIGNATION (0, 2, 0, c1); |
| 2856 | } |
| 2857 | else if (c1 >= 0x28 && c1 <= 0x2B) |
| 2858 | { /* designation of DIMENSION2_CHARS94 character set */ |
| 2859 | ONE_MORE_BYTE (c2); |
| 2860 | DECODE_DESIGNATION (c1 - 0x28, 2, 0, c2); |
| 2861 | } |
| 2862 | else if (c1 >= 0x2C && c1 <= 0x2F) |
| 2863 | { /* designation of DIMENSION2_CHARS96 character set */ |
| 2864 | ONE_MORE_BYTE (c2); |
| 2865 | DECODE_DESIGNATION (c1 - 0x2C, 2, 1, c2); |
| 2866 | } |
| 2867 | else |
| 2868 | goto invalid_code; |
| 2869 | /* We must update these variables now. */ |
| 2870 | charset_id_0 = CODING_ISO_INVOKED_CHARSET (coding, 0); |
| 2871 | charset_id_1 = CODING_ISO_INVOKED_CHARSET (coding, 1); |
| 2872 | continue; |
| 2873 | |
| 2874 | case 'n': /* invocation of locking-shift-2 */ |
| 2875 | if (! (CODING_ISO_FLAGS (coding) & CODING_ISO_FLAG_LOCKING_SHIFT) |
| 2876 | || CODING_ISO_DESIGNATION (coding, 2) < 0) |
| 2877 | goto invalid_code; |
| 2878 | CODING_ISO_INVOCATION (coding, 0) = 2; |
| 2879 | charset_id_0 = CODING_ISO_INVOKED_CHARSET (coding, 0); |
| 2880 | continue; |
| 2881 | |
| 2882 | case 'o': /* invocation of locking-shift-3 */ |
| 2883 | if (! (CODING_ISO_FLAGS (coding) & CODING_ISO_FLAG_LOCKING_SHIFT) |
| 2884 | || CODING_ISO_DESIGNATION (coding, 3) < 0) |
| 2885 | goto invalid_code; |
| 2886 | CODING_ISO_INVOCATION (coding, 0) = 3; |
| 2887 | charset_id_0 = CODING_ISO_INVOKED_CHARSET (coding, 0); |
| 2888 | continue; |
| 2889 | |
| 2890 | case 'N': /* invocation of single-shift-2 */ |
| 2891 | if (! (CODING_ISO_FLAGS (coding) & CODING_ISO_FLAG_SINGLE_SHIFT) |
| 2892 | || CODING_ISO_DESIGNATION (coding, 2) < 0) |
| 2893 | goto invalid_code; |
| 2894 | charset = CHARSET_FROM_ID (CODING_ISO_DESIGNATION (coding, 2)); |
| 2895 | ONE_MORE_BYTE (c1); |
| 2896 | if (c1 < 0x20 || (c1 >= 0x80 && c1 < 0xA0)) |
| 2897 | goto invalid_code; |
| 2898 | break; |
| 2899 | |
| 2900 | case 'O': /* invocation of single-shift-3 */ |
| 2901 | if (! (CODING_ISO_FLAGS (coding) & CODING_ISO_FLAG_SINGLE_SHIFT) |
| 2902 | || CODING_ISO_DESIGNATION (coding, 3) < 0) |
| 2903 | goto invalid_code; |
| 2904 | charset = CHARSET_FROM_ID (CODING_ISO_DESIGNATION (coding, 3)); |
| 2905 | ONE_MORE_BYTE (c1); |
| 2906 | if (c1 < 0x20 || (c1 >= 0x80 && c1 < 0xA0)) |
| 2907 | goto invalid_code; |
| 2908 | break; |
| 2909 | |
| 2910 | case '0': case '2': case '3': case '4': /* start composition */ |
| 2911 | if (! (coding->common_flags & CODING_ANNOTATE_COMPOSITION_MASK)) |
| 2912 | goto invalid_code; |
| 2913 | DECODE_COMPOSITION_START (c1); |
| 2914 | continue; |
| 2915 | |
| 2916 | case '1': /* end composition */ |
| 2917 | if (composition_state == COMPOSING_NO) |
| 2918 | goto invalid_code; |
| 2919 | DECODE_COMPOSITION_END (); |
| 2920 | continue; |
| 2921 | |
| 2922 | case '[': /* specification of direction */ |
| 2923 | if (! CODING_ISO_FLAGS (coding) & CODING_ISO_FLAG_DIRECTION) |
| 2924 | goto invalid_code; |
| 2925 | /* For the moment, nested direction is not supported. |
| 2926 | So, `coding->mode & CODING_MODE_DIRECTION' zero means |
| 2927 | left-to-right, and nozero means right-to-left. */ |
| 2928 | ONE_MORE_BYTE (c1); |
| 2929 | switch (c1) |
| 2930 | { |
| 2931 | case ']': /* end of the current direction */ |
| 2932 | coding->mode &= ~CODING_MODE_DIRECTION; |
| 2933 | |
| 2934 | case '0': /* end of the current direction */ |
| 2935 | case '1': /* start of left-to-right direction */ |
| 2936 | ONE_MORE_BYTE (c1); |
| 2937 | if (c1 == ']') |
| 2938 | coding->mode &= ~CODING_MODE_DIRECTION; |
| 2939 | else |
| 2940 | goto invalid_code; |
| 2941 | break; |
| 2942 | |
| 2943 | case '2': /* start of right-to-left direction */ |
| 2944 | ONE_MORE_BYTE (c1); |
| 2945 | if (c1 == ']') |
| 2946 | coding->mode |= CODING_MODE_DIRECTION; |
| 2947 | else |
| 2948 | goto invalid_code; |
| 2949 | break; |
| 2950 | |
| 2951 | default: |
| 2952 | goto invalid_code; |
| 2953 | } |
| 2954 | continue; |
| 2955 | |
| 2956 | default: |
| 2957 | if (! (CODING_ISO_FLAGS (coding) & CODING_ISO_FLAG_DESIGNATION)) |
| 2958 | goto invalid_code; |
| 2959 | if (c1 >= 0x28 && c1 <= 0x2B) |
| 2960 | { /* designation of DIMENSION1_CHARS94 character set */ |
| 2961 | ONE_MORE_BYTE (c2); |
| 2962 | DECODE_DESIGNATION (c1 - 0x28, 1, 0, c2); |
| 2963 | } |
| 2964 | else if (c1 >= 0x2C && c1 <= 0x2F) |
| 2965 | { /* designation of DIMENSION1_CHARS96 character set */ |
| 2966 | ONE_MORE_BYTE (c2); |
| 2967 | DECODE_DESIGNATION (c1 - 0x2C, 1, 1, c2); |
| 2968 | } |
| 2969 | else |
| 2970 | goto invalid_code; |
| 2971 | /* We must update these variables now. */ |
| 2972 | charset_id_0 = CODING_ISO_INVOKED_CHARSET (coding, 0); |
| 2973 | charset_id_1 = CODING_ISO_INVOKED_CHARSET (coding, 1); |
| 2974 | continue; |
| 2975 | } |
| 2976 | } |
| 2977 | |
| 2978 | /* Now we know CHARSET and 1st position code C1 of a character. |
| 2979 | Produce a decoded character while getting 2nd position code |
| 2980 | C2 if necessary. */ |
| 2981 | c1 &= 0x7F; |
| 2982 | if (CHARSET_DIMENSION (charset) > 1) |
| 2983 | { |
| 2984 | ONE_MORE_BYTE (c2); |
| 2985 | if (c2 < 0x20 || (c2 >= 0x80 && c2 < 0xA0)) |
| 2986 | /* C2 is not in a valid range. */ |
| 2987 | goto invalid_code; |
| 2988 | c1 = (c1 << 8) | (c2 & 0x7F); |
| 2989 | if (CHARSET_DIMENSION (charset) > 2) |
| 2990 | { |
| 2991 | ONE_MORE_BYTE (c2); |
| 2992 | if (c2 < 0x20 || (c2 >= 0x80 && c2 < 0xA0)) |
| 2993 | /* C2 is not in a valid range. */ |
| 2994 | goto invalid_code; |
| 2995 | c1 = (c1 << 8) | (c2 & 0x7F); |
| 2996 | } |
| 2997 | } |
| 2998 | |
| 2999 | CODING_DECODE_CHAR (coding, src, src_base, src_end, charset, c1, c); |
| 3000 | if (c < 0) |
| 3001 | { |
| 3002 | MAYBE_FINISH_COMPOSITION (); |
| 3003 | for (; src_base < src; src_base++, char_offset++) |
| 3004 | { |
| 3005 | if (ASCII_BYTE_P (*src_base)) |
| 3006 | *charbuf++ = *src_base; |
| 3007 | else |
| 3008 | *charbuf++ = BYTE8_TO_CHAR (*src_base); |
| 3009 | } |
| 3010 | } |
| 3011 | else if (composition_state == COMPOSING_NO) |
| 3012 | { |
| 3013 | *charbuf++ = c; |
| 3014 | char_offset++; |
| 3015 | } |
| 3016 | else |
| 3017 | components[component_idx++] = c; |
| 3018 | continue; |
| 3019 | |
| 3020 | invalid_code: |
| 3021 | MAYBE_FINISH_COMPOSITION (); |
| 3022 | src = src_base; |
| 3023 | consumed_chars = consumed_chars_base; |
| 3024 | ONE_MORE_BYTE (c); |
| 3025 | *charbuf++ = ASCII_BYTE_P (c) ? c : BYTE8_TO_CHAR (c); |
| 3026 | coding->errors++; |
| 3027 | } |
| 3028 | |
| 3029 | no_more_source: |
| 3030 | coding->consumed_char += consumed_chars_base; |
| 3031 | coding->consumed = src_base - coding->source; |
| 3032 | coding->charbuf_used = charbuf - coding->charbuf; |
| 3033 | } |
| 3034 | |
| 3035 | |
| 3036 | /* ISO2022 encoding stuff. */ |
| 3037 | |
| 3038 | /* |
| 3039 | It is not enough to say just "ISO2022" on encoding, we have to |
| 3040 | specify more details. In Emacs, each coding system of ISO2022 |
| 3041 | variant has the following specifications: |
| 3042 | 1. Initial designation to G0 thru G3. |
| 3043 | 2. Allows short-form designation? |
| 3044 | 3. ASCII should be designated to G0 before control characters? |
| 3045 | 4. ASCII should be designated to G0 at end of line? |
| 3046 | 5. 7-bit environment or 8-bit environment? |
| 3047 | 6. Use locking-shift? |
| 3048 | 7. Use Single-shift? |
| 3049 | And the following two are only for Japanese: |
| 3050 | 8. Use ASCII in place of JIS0201-1976-Roman? |
| 3051 | 9. Use JISX0208-1983 in place of JISX0208-1978? |
| 3052 | These specifications are encoded in CODING_ISO_FLAGS (coding) as flag bits |
| 3053 | defined by macros CODING_ISO_FLAG_XXX. See `coding.h' for more |
| 3054 | details. |
| 3055 | */ |
| 3056 | |
| 3057 | /* Produce codes (escape sequence) for designating CHARSET to graphic |
| 3058 | register REG at DST, and increment DST. If <final-char> of CHARSET is |
| 3059 | '@', 'A', or 'B' and the coding system CODING allows, produce |
| 3060 | designation sequence of short-form. */ |
| 3061 | |
| 3062 | #define ENCODE_DESIGNATION(charset, reg, coding) \ |
| 3063 | do { \ |
| 3064 | unsigned char final_char = CHARSET_ISO_FINAL (charset); \ |
| 3065 | char *intermediate_char_94 = "()*+"; \ |
| 3066 | char *intermediate_char_96 = ",-./"; \ |
| 3067 | int revision = -1; \ |
| 3068 | int c; \ |
| 3069 | \ |
| 3070 | if (CODING_ISO_FLAGS (coding) & CODING_ISO_FLAG_REVISION) \ |
| 3071 | revision = XINT (CHARSET_ISO_REVISION (charset)); \ |
| 3072 | \ |
| 3073 | if (revision >= 0) \ |
| 3074 | { \ |
| 3075 | EMIT_TWO_ASCII_BYTES (ISO_CODE_ESC, '&'); \ |
| 3076 | EMIT_ONE_BYTE ('@' + revision); \ |
| 3077 | } \ |
| 3078 | EMIT_ONE_ASCII_BYTE (ISO_CODE_ESC); \ |
| 3079 | if (CHARSET_DIMENSION (charset) == 1) \ |
| 3080 | { \ |
| 3081 | if (! CHARSET_ISO_CHARS_96 (charset)) \ |
| 3082 | c = intermediate_char_94[reg]; \ |
| 3083 | else \ |
| 3084 | c = intermediate_char_96[reg]; \ |
| 3085 | EMIT_ONE_ASCII_BYTE (c); \ |
| 3086 | } \ |
| 3087 | else \ |
| 3088 | { \ |
| 3089 | EMIT_ONE_ASCII_BYTE ('$'); \ |
| 3090 | if (! CHARSET_ISO_CHARS_96 (charset)) \ |
| 3091 | { \ |
| 3092 | if (CODING_ISO_FLAGS (coding) & CODING_ISO_FLAG_LONG_FORM \ |
| 3093 | || reg != 0 \ |
| 3094 | || final_char < '@' || final_char > 'B') \ |
| 3095 | EMIT_ONE_ASCII_BYTE (intermediate_char_94[reg]); \ |
| 3096 | } \ |
| 3097 | else \ |
| 3098 | EMIT_ONE_ASCII_BYTE (intermediate_char_96[reg]); \ |
| 3099 | } \ |
| 3100 | EMIT_ONE_ASCII_BYTE (final_char); \ |
| 3101 | \ |
| 3102 | CODING_ISO_DESIGNATION (coding, reg) = CHARSET_ID (charset); \ |
| 3103 | } while (0) |
| 3104 | |
| 3105 | |
| 3106 | /* The following two macros produce codes (control character or escape |
| 3107 | sequence) for ISO2022 single-shift functions (single-shift-2 and |
| 3108 | single-shift-3). */ |
| 3109 | |
| 3110 | #define ENCODE_SINGLE_SHIFT_2 \ |
| 3111 | do { \ |
| 3112 | if (CODING_ISO_FLAGS (coding) & CODING_ISO_FLAG_SEVEN_BITS) \ |
| 3113 | EMIT_TWO_ASCII_BYTES (ISO_CODE_ESC, 'N'); \ |
| 3114 | else \ |
| 3115 | EMIT_ONE_BYTE (ISO_CODE_SS2); \ |
| 3116 | CODING_ISO_SINGLE_SHIFTING (coding) = 1; \ |
| 3117 | } while (0) |
| 3118 | |
| 3119 | |
| 3120 | #define ENCODE_SINGLE_SHIFT_3 \ |
| 3121 | do { \ |
| 3122 | if (CODING_ISO_FLAGS (coding) & CODING_ISO_FLAG_SEVEN_BITS) \ |
| 3123 | EMIT_TWO_ASCII_BYTES (ISO_CODE_ESC, 'O'); \ |
| 3124 | else \ |
| 3125 | EMIT_ONE_BYTE (ISO_CODE_SS3); \ |
| 3126 | CODING_ISO_SINGLE_SHIFTING (coding) = 1; \ |
| 3127 | } while (0) |
| 3128 | |
| 3129 | |
| 3130 | /* The following four macros produce codes (control character or |
| 3131 | escape sequence) for ISO2022 locking-shift functions (shift-in, |
| 3132 | shift-out, locking-shift-2, and locking-shift-3). */ |
| 3133 | |
| 3134 | #define ENCODE_SHIFT_IN \ |
| 3135 | do { \ |
| 3136 | EMIT_ONE_ASCII_BYTE (ISO_CODE_SI); \ |
| 3137 | CODING_ISO_INVOCATION (coding, 0) = 0; \ |
| 3138 | } while (0) |
| 3139 | |
| 3140 | |
| 3141 | #define ENCODE_SHIFT_OUT \ |
| 3142 | do { \ |
| 3143 | EMIT_ONE_ASCII_BYTE (ISO_CODE_SO); \ |
| 3144 | CODING_ISO_INVOCATION (coding, 0) = 1; \ |
| 3145 | } while (0) |
| 3146 | |
| 3147 | |
| 3148 | #define ENCODE_LOCKING_SHIFT_2 \ |
| 3149 | do { \ |
| 3150 | EMIT_TWO_ASCII_BYTES (ISO_CODE_ESC, 'n'); \ |
| 3151 | CODING_ISO_INVOCATION (coding, 0) = 2; \ |
| 3152 | } while (0) |
| 3153 | |
| 3154 | |
| 3155 | #define ENCODE_LOCKING_SHIFT_3 \ |
| 3156 | do { \ |
| 3157 | EMIT_TWO_ASCII_BYTES (ISO_CODE_ESC, 'n'); \ |
| 3158 | CODING_ISO_INVOCATION (coding, 0) = 3; \ |
| 3159 | } while (0) |
| 3160 | |
| 3161 | |
| 3162 | /* Produce codes for a DIMENSION1 character whose character set is |
| 3163 | CHARSET and whose position-code is C1. Designation and invocation |
| 3164 | sequences are also produced in advance if necessary. */ |
| 3165 | |
| 3166 | #define ENCODE_ISO_CHARACTER_DIMENSION1(charset, c1) \ |
| 3167 | do { \ |
| 3168 | int id = CHARSET_ID (charset); \ |
| 3169 | if (CODING_ISO_SINGLE_SHIFTING (coding)) \ |
| 3170 | { \ |
| 3171 | if (CODING_ISO_FLAGS (coding) & CODING_ISO_FLAG_SEVEN_BITS) \ |
| 3172 | EMIT_ONE_ASCII_BYTE (c1 & 0x7F); \ |
| 3173 | else \ |
| 3174 | EMIT_ONE_BYTE (c1 | 0x80); \ |
| 3175 | CODING_ISO_SINGLE_SHIFTING (coding) = 0; \ |
| 3176 | break; \ |
| 3177 | } \ |
| 3178 | else if (id == CODING_ISO_INVOKED_CHARSET (coding, 0)) \ |
| 3179 | { \ |
| 3180 | EMIT_ONE_ASCII_BYTE (c1 & 0x7F); \ |
| 3181 | break; \ |
| 3182 | } \ |
| 3183 | else if (id == CODING_ISO_INVOKED_CHARSET (coding, 1)) \ |
| 3184 | { \ |
| 3185 | EMIT_ONE_BYTE (c1 | 0x80); \ |
| 3186 | break; \ |
| 3187 | } \ |
| 3188 | else \ |
| 3189 | /* Since CHARSET is not yet invoked to any graphic planes, we \ |
| 3190 | must invoke it, or, at first, designate it to some graphic \ |
| 3191 | register. Then repeat the loop to actually produce the \ |
| 3192 | character. */ \ |
| 3193 | dst = encode_invocation_designation (charset, coding, dst, \ |
| 3194 | &produced_chars); \ |
| 3195 | } while (1) |
| 3196 | |
| 3197 | |
| 3198 | /* Produce codes for a DIMENSION2 character whose character set is |
| 3199 | CHARSET and whose position-codes are C1 and C2. Designation and |
| 3200 | invocation codes are also produced in advance if necessary. */ |
| 3201 | |
| 3202 | #define ENCODE_ISO_CHARACTER_DIMENSION2(charset, c1, c2) \ |
| 3203 | do { \ |
| 3204 | int id = CHARSET_ID (charset); \ |
| 3205 | if (CODING_ISO_SINGLE_SHIFTING (coding)) \ |
| 3206 | { \ |
| 3207 | if (CODING_ISO_FLAGS (coding) & CODING_ISO_FLAG_SEVEN_BITS) \ |
| 3208 | EMIT_TWO_ASCII_BYTES ((c1) & 0x7F, (c2) & 0x7F); \ |
| 3209 | else \ |
| 3210 | EMIT_TWO_BYTES ((c1) | 0x80, (c2) | 0x80); \ |
| 3211 | CODING_ISO_SINGLE_SHIFTING (coding) = 0; \ |
| 3212 | break; \ |
| 3213 | } \ |
| 3214 | else if (id == CODING_ISO_INVOKED_CHARSET (coding, 0)) \ |
| 3215 | { \ |
| 3216 | EMIT_TWO_ASCII_BYTES ((c1) & 0x7F, (c2) & 0x7F); \ |
| 3217 | break; \ |
| 3218 | } \ |
| 3219 | else if (id == CODING_ISO_INVOKED_CHARSET (coding, 1)) \ |
| 3220 | { \ |
| 3221 | EMIT_TWO_BYTES ((c1) | 0x80, (c2) | 0x80); \ |
| 3222 | break; \ |
| 3223 | } \ |
| 3224 | else \ |
| 3225 | /* Since CHARSET is not yet invoked to any graphic planes, we \ |
| 3226 | must invoke it, or, at first, designate it to some graphic \ |
| 3227 | register. Then repeat the loop to actually produce the \ |
| 3228 | character. */ \ |
| 3229 | dst = encode_invocation_designation (charset, coding, dst, \ |
| 3230 | &produced_chars); \ |
| 3231 | } while (1) |
| 3232 | |
| 3233 | |
| 3234 | #define ENCODE_ISO_CHARACTER(charset, c) \ |
| 3235 | do { \ |
| 3236 | int code = ENCODE_CHAR ((charset),(c)); \ |
| 3237 | \ |
| 3238 | if (CHARSET_DIMENSION (charset) == 1) \ |
| 3239 | ENCODE_ISO_CHARACTER_DIMENSION1 ((charset), code); \ |
| 3240 | else \ |
| 3241 | ENCODE_ISO_CHARACTER_DIMENSION2 ((charset), code >> 8, code & 0xFF); \ |
| 3242 | } while (0) |
| 3243 | |
| 3244 | |
| 3245 | /* Produce designation and invocation codes at a place pointed by DST |
| 3246 | to use CHARSET. The element `spec.iso_2022' of *CODING is updated. |
| 3247 | Return new DST. */ |
| 3248 | |
| 3249 | unsigned char * |
| 3250 | encode_invocation_designation (charset, coding, dst, p_nchars) |
| 3251 | struct charset *charset; |
| 3252 | struct coding_system *coding; |
| 3253 | unsigned char *dst; |
| 3254 | int *p_nchars; |
| 3255 | { |
| 3256 | int multibytep = coding->dst_multibyte; |
| 3257 | int produced_chars = *p_nchars; |
| 3258 | int reg; /* graphic register number */ |
| 3259 | int id = CHARSET_ID (charset); |
| 3260 | |
| 3261 | /* At first, check designations. */ |
| 3262 | for (reg = 0; reg < 4; reg++) |
| 3263 | if (id == CODING_ISO_DESIGNATION (coding, reg)) |
| 3264 | break; |
| 3265 | |
| 3266 | if (reg >= 4) |
| 3267 | { |
| 3268 | /* CHARSET is not yet designated to any graphic registers. */ |
| 3269 | /* At first check the requested designation. */ |
| 3270 | reg = CODING_ISO_REQUEST (coding, id); |
| 3271 | if (reg < 0) |
| 3272 | /* Since CHARSET requests no special designation, designate it |
| 3273 | to graphic register 0. */ |
| 3274 | reg = 0; |
| 3275 | |
| 3276 | ENCODE_DESIGNATION (charset, reg, coding); |
| 3277 | } |
| 3278 | |
| 3279 | if (CODING_ISO_INVOCATION (coding, 0) != reg |
| 3280 | && CODING_ISO_INVOCATION (coding, 1) != reg) |
| 3281 | { |
| 3282 | /* Since the graphic register REG is not invoked to any graphic |
| 3283 | planes, invoke it to graphic plane 0. */ |
| 3284 | switch (reg) |
| 3285 | { |
| 3286 | case 0: /* graphic register 0 */ |
| 3287 | ENCODE_SHIFT_IN; |
| 3288 | break; |
| 3289 | |
| 3290 | case 1: /* graphic register 1 */ |
| 3291 | ENCODE_SHIFT_OUT; |
| 3292 | break; |
| 3293 | |
| 3294 | case 2: /* graphic register 2 */ |
| 3295 | if (CODING_ISO_FLAGS (coding) & CODING_ISO_FLAG_SINGLE_SHIFT) |
| 3296 | ENCODE_SINGLE_SHIFT_2; |
| 3297 | else |
| 3298 | ENCODE_LOCKING_SHIFT_2; |
| 3299 | break; |
| 3300 | |
| 3301 | case 3: /* graphic register 3 */ |
| 3302 | if (CODING_ISO_FLAGS (coding) & CODING_ISO_FLAG_SINGLE_SHIFT) |
| 3303 | ENCODE_SINGLE_SHIFT_3; |
| 3304 | else |
| 3305 | ENCODE_LOCKING_SHIFT_3; |
| 3306 | break; |
| 3307 | } |
| 3308 | } |
| 3309 | |
| 3310 | *p_nchars = produced_chars; |
| 3311 | return dst; |
| 3312 | } |
| 3313 | |
| 3314 | /* The following three macros produce codes for indicating direction |
| 3315 | of text. */ |
| 3316 | #define ENCODE_CONTROL_SEQUENCE_INTRODUCER \ |
| 3317 | do { \ |
| 3318 | if (CODING_ISO_FLAGS (coding) == CODING_ISO_FLAG_SEVEN_BITS) \ |
| 3319 | EMIT_TWO_ASCII_BYTES (ISO_CODE_ESC, '['); \ |
| 3320 | else \ |
| 3321 | EMIT_ONE_BYTE (ISO_CODE_CSI); \ |
| 3322 | } while (0) |
| 3323 | |
| 3324 | |
| 3325 | #define ENCODE_DIRECTION_R2L() \ |
| 3326 | do { \ |
| 3327 | ENCODE_CONTROL_SEQUENCE_INTRODUCER (dst); \ |
| 3328 | EMIT_TWO_ASCII_BYTES ('2', ']'); \ |
| 3329 | } while (0) |
| 3330 | |
| 3331 | |
| 3332 | #define ENCODE_DIRECTION_L2R() \ |
| 3333 | do { \ |
| 3334 | ENCODE_CONTROL_SEQUENCE_INTRODUCER (dst); \ |
| 3335 | EMIT_TWO_ASCII_BYTES ('0', ']'); \ |
| 3336 | } while (0) |
| 3337 | |
| 3338 | |
| 3339 | /* Produce codes for designation and invocation to reset the graphic |
| 3340 | planes and registers to initial state. */ |
| 3341 | #define ENCODE_RESET_PLANE_AND_REGISTER() \ |
| 3342 | do { \ |
| 3343 | int reg; \ |
| 3344 | struct charset *charset; \ |
| 3345 | \ |
| 3346 | if (CODING_ISO_INVOCATION (coding, 0) != 0) \ |
| 3347 | ENCODE_SHIFT_IN; \ |
| 3348 | for (reg = 0; reg < 4; reg++) \ |
| 3349 | if (CODING_ISO_INITIAL (coding, reg) >= 0 \ |
| 3350 | && (CODING_ISO_DESIGNATION (coding, reg) \ |
| 3351 | != CODING_ISO_INITIAL (coding, reg))) \ |
| 3352 | { \ |
| 3353 | charset = CHARSET_FROM_ID (CODING_ISO_INITIAL (coding, reg)); \ |
| 3354 | ENCODE_DESIGNATION (charset, reg, coding); \ |
| 3355 | } \ |
| 3356 | } while (0) |
| 3357 | |
| 3358 | |
| 3359 | /* Produce designation sequences of charsets in the line started from |
| 3360 | SRC to a place pointed by DST, and return updated DST. |
| 3361 | |
| 3362 | If the current block ends before any end-of-line, we may fail to |
| 3363 | find all the necessary designations. */ |
| 3364 | |
| 3365 | static unsigned char * |
| 3366 | encode_designation_at_bol (coding, charbuf, charbuf_end, dst) |
| 3367 | struct coding_system *coding; |
| 3368 | int *charbuf, *charbuf_end; |
| 3369 | unsigned char *dst; |
| 3370 | { |
| 3371 | struct charset *charset; |
| 3372 | /* Table of charsets to be designated to each graphic register. */ |
| 3373 | int r[4]; |
| 3374 | int c, found = 0, reg; |
| 3375 | int produced_chars = 0; |
| 3376 | int multibytep = coding->dst_multibyte; |
| 3377 | Lisp_Object attrs; |
| 3378 | Lisp_Object charset_list; |
| 3379 | |
| 3380 | attrs = CODING_ID_ATTRS (coding->id); |
| 3381 | charset_list = CODING_ATTR_CHARSET_LIST (attrs); |
| 3382 | if (EQ (charset_list, Qiso_2022)) |
| 3383 | charset_list = Viso_2022_charset_list; |
| 3384 | |
| 3385 | for (reg = 0; reg < 4; reg++) |
| 3386 | r[reg] = -1; |
| 3387 | |
| 3388 | while (found < 4) |
| 3389 | { |
| 3390 | int id; |
| 3391 | |
| 3392 | c = *charbuf++; |
| 3393 | if (c == '\n') |
| 3394 | break; |
| 3395 | charset = char_charset (c, charset_list, NULL); |
| 3396 | id = CHARSET_ID (charset); |
| 3397 | reg = CODING_ISO_REQUEST (coding, id); |
| 3398 | if (reg >= 0 && r[reg] < 0) |
| 3399 | { |
| 3400 | found++; |
| 3401 | r[reg] = id; |
| 3402 | } |
| 3403 | } |
| 3404 | |
| 3405 | if (found) |
| 3406 | { |
| 3407 | for (reg = 0; reg < 4; reg++) |
| 3408 | if (r[reg] >= 0 |
| 3409 | && CODING_ISO_DESIGNATION (coding, reg) != r[reg]) |
| 3410 | ENCODE_DESIGNATION (CHARSET_FROM_ID (r[reg]), reg, coding); |
| 3411 | } |
| 3412 | |
| 3413 | return dst; |
| 3414 | } |
| 3415 | |
| 3416 | /* See the above "GENERAL NOTES on `encode_coding_XXX ()' functions". */ |
| 3417 | |
| 3418 | static int |
| 3419 | encode_coding_iso_2022 (coding) |
| 3420 | struct coding_system *coding; |
| 3421 | { |
| 3422 | int multibytep = coding->dst_multibyte; |
| 3423 | int *charbuf = coding->charbuf; |
| 3424 | int *charbuf_end = charbuf + coding->charbuf_used; |
| 3425 | unsigned char *dst = coding->destination + coding->produced; |
| 3426 | unsigned char *dst_end = coding->destination + coding->dst_bytes; |
| 3427 | int safe_room = 16; |
| 3428 | int bol_designation |
| 3429 | = (CODING_ISO_FLAGS (coding) & CODING_ISO_FLAG_DESIGNATE_AT_BOL |
| 3430 | && CODING_ISO_BOL (coding)); |
| 3431 | int produced_chars = 0; |
| 3432 | Lisp_Object attrs, eol_type, charset_list; |
| 3433 | int ascii_compatible; |
| 3434 | int c; |
| 3435 | |
| 3436 | CODING_GET_INFO (coding, attrs, eol_type, charset_list); |
| 3437 | |
| 3438 | ascii_compatible = ! NILP (CODING_ATTR_ASCII_COMPAT (attrs)); |
| 3439 | |
| 3440 | while (charbuf < charbuf_end) |
| 3441 | { |
| 3442 | ASSURE_DESTINATION (safe_room); |
| 3443 | |
| 3444 | if (bol_designation) |
| 3445 | { |
| 3446 | unsigned char *dst_prev = dst; |
| 3447 | |
| 3448 | /* We have to produce designation sequences if any now. */ |
| 3449 | dst = encode_designation_at_bol (coding, charbuf, charbuf_end, dst); |
| 3450 | bol_designation = 0; |
| 3451 | /* We are sure that designation sequences are all ASCII bytes. */ |
| 3452 | produced_chars += dst - dst_prev; |
| 3453 | } |
| 3454 | |
| 3455 | c = *charbuf++; |
| 3456 | |
| 3457 | /* Now encode the character C. */ |
| 3458 | if (c < 0x20 || c == 0x7F) |
| 3459 | { |
| 3460 | if (c == '\n' |
| 3461 | || (c == '\r' && EQ (eol_type, Qmac))) |
| 3462 | { |
| 3463 | if (CODING_ISO_FLAGS (coding) & CODING_ISO_FLAG_RESET_AT_EOL) |
| 3464 | ENCODE_RESET_PLANE_AND_REGISTER (); |
| 3465 | if (CODING_ISO_FLAGS (coding) & CODING_ISO_FLAG_INIT_AT_BOL) |
| 3466 | { |
| 3467 | int i; |
| 3468 | |
| 3469 | for (i = 0; i < 4; i++) |
| 3470 | CODING_ISO_DESIGNATION (coding, i) |
| 3471 | = CODING_ISO_INITIAL (coding, i); |
| 3472 | } |
| 3473 | bol_designation |
| 3474 | = CODING_ISO_FLAGS (coding) & CODING_ISO_FLAG_DESIGNATE_AT_BOL; |
| 3475 | } |
| 3476 | else if (CODING_ISO_FLAGS (coding) & CODING_ISO_FLAG_RESET_AT_CNTL) |
| 3477 | ENCODE_RESET_PLANE_AND_REGISTER (); |
| 3478 | EMIT_ONE_ASCII_BYTE (c); |
| 3479 | } |
| 3480 | else if (ASCII_CHAR_P (c)) |
| 3481 | { |
| 3482 | if (ascii_compatible) |
| 3483 | EMIT_ONE_ASCII_BYTE (c); |
| 3484 | else |
| 3485 | ENCODE_ISO_CHARACTER (CHARSET_FROM_ID (charset_ascii), c); |
| 3486 | } |
| 3487 | else |
| 3488 | { |
| 3489 | struct charset *charset = char_charset (c, charset_list, NULL); |
| 3490 | |
| 3491 | if (!charset) |
| 3492 | { |
| 3493 | c = coding->default_char; |
| 3494 | charset = char_charset (c, charset_list, NULL); |
| 3495 | } |
| 3496 | ENCODE_ISO_CHARACTER (charset, c); |
| 3497 | } |
| 3498 | } |
| 3499 | |
| 3500 | if (coding->mode & CODING_MODE_LAST_BLOCK |
| 3501 | && CODING_ISO_FLAGS (coding) & CODING_ISO_FLAG_RESET_AT_EOL) |
| 3502 | { |
| 3503 | ASSURE_DESTINATION (safe_room); |
| 3504 | ENCODE_RESET_PLANE_AND_REGISTER (); |
| 3505 | } |
| 3506 | coding->result = CODING_RESULT_SUCCESS; |
| 3507 | CODING_ISO_BOL (coding) = bol_designation; |
| 3508 | coding->produced_char += produced_chars; |
| 3509 | coding->produced = dst - coding->destination; |
| 3510 | return 0; |
| 3511 | } |
| 3512 | |
| 3513 | \f |
| 3514 | /*** 8,9. SJIS and BIG5 handlers ***/ |
| 3515 | |
| 3516 | /* Although SJIS and BIG5 are not ISO's coding system, they are used |
| 3517 | quite widely. So, for the moment, Emacs supports them in the bare |
| 3518 | C code. But, in the future, they may be supported only by CCL. */ |
| 3519 | |
| 3520 | /* SJIS is a coding system encoding three character sets: ASCII, right |
| 3521 | half of JISX0201-Kana, and JISX0208. An ASCII character is encoded |
| 3522 | as is. A character of charset katakana-jisx0201 is encoded by |
| 3523 | "position-code + 0x80". A character of charset japanese-jisx0208 |
| 3524 | is encoded in 2-byte but two position-codes are divided and shifted |
| 3525 | so that it fit in the range below. |
| 3526 | |
| 3527 | --- CODE RANGE of SJIS --- |
| 3528 | (character set) (range) |
| 3529 | ASCII 0x00 .. 0x7F |
| 3530 | KATAKANA-JISX0201 0xA0 .. 0xDF |
| 3531 | JISX0208 (1st byte) 0x81 .. 0x9F and 0xE0 .. 0xEF |
| 3532 | (2nd byte) 0x40 .. 0x7E and 0x80 .. 0xFC |
| 3533 | ------------------------------- |
| 3534 | |
| 3535 | */ |
| 3536 | |
| 3537 | /* BIG5 is a coding system encoding two character sets: ASCII and |
| 3538 | Big5. An ASCII character is encoded as is. Big5 is a two-byte |
| 3539 | character set and is encoded in two-byte. |
| 3540 | |
| 3541 | --- CODE RANGE of BIG5 --- |
| 3542 | (character set) (range) |
| 3543 | ASCII 0x00 .. 0x7F |
| 3544 | Big5 (1st byte) 0xA1 .. 0xFE |
| 3545 | (2nd byte) 0x40 .. 0x7E and 0xA1 .. 0xFE |
| 3546 | -------------------------- |
| 3547 | |
| 3548 | */ |
| 3549 | |
| 3550 | /* See the above "GENERAL NOTES on `detect_coding_XXX ()' functions". |
| 3551 | Check if a text is encoded in SJIS. If it is, return |
| 3552 | CATEGORY_MASK_SJIS, else return 0. */ |
| 3553 | |
| 3554 | static int |
| 3555 | detect_coding_sjis (coding, mask) |
| 3556 | struct coding_system *coding; |
| 3557 | int *mask; |
| 3558 | { |
| 3559 | unsigned char *src = coding->source, *src_base = src; |
| 3560 | unsigned char *src_end = coding->source + coding->src_bytes; |
| 3561 | int multibytep = coding->src_multibyte; |
| 3562 | int consumed_chars = 0; |
| 3563 | int found = 0; |
| 3564 | int c; |
| 3565 | |
| 3566 | /* A coding system of this category is always ASCII compatible. */ |
| 3567 | src += coding->head_ascii; |
| 3568 | |
| 3569 | while (1) |
| 3570 | { |
| 3571 | ONE_MORE_BYTE (c); |
| 3572 | if (c < 0x80) |
| 3573 | continue; |
| 3574 | if ((c >= 0x81 && c <= 0x9F) || (c >= 0xE0 && c <= 0xEF)) |
| 3575 | { |
| 3576 | ONE_MORE_BYTE (c); |
| 3577 | if (c < 0x40 || c == 0x7F || c > 0xFC) |
| 3578 | break; |
| 3579 | found = 1; |
| 3580 | } |
| 3581 | else if (c >= 0xA0 && c < 0xE0) |
| 3582 | found = 1; |
| 3583 | else |
| 3584 | break; |
| 3585 | } |
| 3586 | *mask &= ~CATEGORY_MASK_SJIS; |
| 3587 | return 0; |
| 3588 | |
| 3589 | no_more_source: |
| 3590 | if (!found) |
| 3591 | return 0; |
| 3592 | *mask &= CATEGORY_MASK_SJIS; |
| 3593 | return 1; |
| 3594 | } |
| 3595 | |
| 3596 | /* See the above "GENERAL NOTES on `detect_coding_XXX ()' functions". |
| 3597 | Check if a text is encoded in BIG5. If it is, return |
| 3598 | CATEGORY_MASK_BIG5, else return 0. */ |
| 3599 | |
| 3600 | static int |
| 3601 | detect_coding_big5 (coding, mask) |
| 3602 | struct coding_system *coding; |
| 3603 | int *mask; |
| 3604 | { |
| 3605 | unsigned char *src = coding->source, *src_base = src; |
| 3606 | unsigned char *src_end = coding->source + coding->src_bytes; |
| 3607 | int multibytep = coding->src_multibyte; |
| 3608 | int consumed_chars = 0; |
| 3609 | int found = 0; |
| 3610 | int c; |
| 3611 | |
| 3612 | /* A coding system of this category is always ASCII compatible. */ |
| 3613 | src += coding->head_ascii; |
| 3614 | |
| 3615 | while (1) |
| 3616 | { |
| 3617 | ONE_MORE_BYTE (c); |
| 3618 | if (c < 0x80) |
| 3619 | continue; |
| 3620 | if (c >= 0xA1) |
| 3621 | { |
| 3622 | ONE_MORE_BYTE (c); |
| 3623 | if (c < 0x40 || (c >= 0x7F && c <= 0xA0)) |
| 3624 | return 0; |
| 3625 | found = 1; |
| 3626 | } |
| 3627 | else |
| 3628 | break; |
| 3629 | } |
| 3630 | *mask &= ~CATEGORY_MASK_BIG5; |
| 3631 | return 0; |
| 3632 | |
| 3633 | no_more_source: |
| 3634 | if (!found) |
| 3635 | return 0; |
| 3636 | *mask &= CATEGORY_MASK_BIG5; |
| 3637 | return 1; |
| 3638 | } |
| 3639 | |
| 3640 | /* See the above "GENERAL NOTES on `decode_coding_XXX ()' functions". |
| 3641 | If SJIS_P is 1, decode SJIS text, else decode BIG5 test. */ |
| 3642 | |
| 3643 | static void |
| 3644 | decode_coding_sjis (coding) |
| 3645 | struct coding_system *coding; |
| 3646 | { |
| 3647 | unsigned char *src = coding->source + coding->consumed; |
| 3648 | unsigned char *src_end = coding->source + coding->src_bytes; |
| 3649 | unsigned char *src_base; |
| 3650 | int *charbuf = coding->charbuf; |
| 3651 | int *charbuf_end = charbuf + coding->charbuf_size; |
| 3652 | int consumed_chars = 0, consumed_chars_base; |
| 3653 | int multibytep = coding->src_multibyte; |
| 3654 | struct charset *charset_roman, *charset_kanji, *charset_kana; |
| 3655 | Lisp_Object attrs, eol_type, charset_list, val; |
| 3656 | |
| 3657 | CODING_GET_INFO (coding, attrs, eol_type, charset_list); |
| 3658 | |
| 3659 | val = charset_list; |
| 3660 | charset_roman = CHARSET_FROM_ID (XINT (XCAR (val))), val = XCDR (val); |
| 3661 | charset_kanji = CHARSET_FROM_ID (XINT (XCAR (val))), val = XCDR (val); |
| 3662 | charset_kana = CHARSET_FROM_ID (XINT (XCAR (val))); |
| 3663 | |
| 3664 | while (1) |
| 3665 | { |
| 3666 | int c, c1; |
| 3667 | |
| 3668 | src_base = src; |
| 3669 | consumed_chars_base = consumed_chars; |
| 3670 | |
| 3671 | if (charbuf >= charbuf_end) |
| 3672 | break; |
| 3673 | |
| 3674 | ONE_MORE_BYTE (c); |
| 3675 | |
| 3676 | if (c == '\r') |
| 3677 | { |
| 3678 | if (EQ (eol_type, Qdos)) |
| 3679 | { |
| 3680 | if (src == src_end) |
| 3681 | goto no_more_source; |
| 3682 | if (*src == '\n') |
| 3683 | ONE_MORE_BYTE (c); |
| 3684 | } |
| 3685 | else if (EQ (eol_type, Qmac)) |
| 3686 | c = '\n'; |
| 3687 | } |
| 3688 | else |
| 3689 | { |
| 3690 | struct charset *charset; |
| 3691 | |
| 3692 | if (c < 0x80) |
| 3693 | charset = charset_roman; |
| 3694 | else |
| 3695 | { |
| 3696 | if (c >= 0xF0) |
| 3697 | goto invalid_code; |
| 3698 | if (c < 0xA0 || c >= 0xE0) |
| 3699 | { |
| 3700 | /* SJIS -> JISX0208 */ |
| 3701 | ONE_MORE_BYTE (c1); |
| 3702 | if (c1 < 0x40 || c1 == 0x7F || c1 > 0xFC) |
| 3703 | goto invalid_code; |
| 3704 | c = (c << 8) | c1; |
| 3705 | SJIS_TO_JIS (c); |
| 3706 | charset = charset_kanji; |
| 3707 | } |
| 3708 | else |
| 3709 | /* SJIS -> JISX0201-Kana */ |
| 3710 | charset = charset_kana; |
| 3711 | } |
| 3712 | CODING_DECODE_CHAR (coding, src, src_base, src_end, charset, c, c); |
| 3713 | } |
| 3714 | *charbuf++ = c; |
| 3715 | continue; |
| 3716 | |
| 3717 | invalid_code: |
| 3718 | src = src_base; |
| 3719 | consumed_chars = consumed_chars_base; |
| 3720 | ONE_MORE_BYTE (c); |
| 3721 | *charbuf++ = ASCII_BYTE_P (c) ? c : BYTE8_TO_CHAR (c); |
| 3722 | coding->errors++; |
| 3723 | } |
| 3724 | |
| 3725 | no_more_source: |
| 3726 | coding->consumed_char += consumed_chars_base; |
| 3727 | coding->consumed = src_base - coding->source; |
| 3728 | coding->charbuf_used = charbuf - coding->charbuf; |
| 3729 | } |
| 3730 | |
| 3731 | static void |
| 3732 | decode_coding_big5 (coding) |
| 3733 | struct coding_system *coding; |
| 3734 | { |
| 3735 | unsigned char *src = coding->source + coding->consumed; |
| 3736 | unsigned char *src_end = coding->source + coding->src_bytes; |
| 3737 | unsigned char *src_base; |
| 3738 | int *charbuf = coding->charbuf; |
| 3739 | int *charbuf_end = charbuf + coding->charbuf_size; |
| 3740 | int consumed_chars = 0, consumed_chars_base; |
| 3741 | int multibytep = coding->src_multibyte; |
| 3742 | struct charset *charset_roman, *charset_big5; |
| 3743 | Lisp_Object attrs, eol_type, charset_list, val; |
| 3744 | |
| 3745 | CODING_GET_INFO (coding, attrs, eol_type, charset_list); |
| 3746 | val = charset_list; |
| 3747 | charset_roman = CHARSET_FROM_ID (XINT (XCAR (val))), val = XCDR (val); |
| 3748 | charset_big5 = CHARSET_FROM_ID (XINT (XCAR (val))); |
| 3749 | |
| 3750 | while (1) |
| 3751 | { |
| 3752 | int c, c1; |
| 3753 | |
| 3754 | src_base = src; |
| 3755 | consumed_chars_base = consumed_chars; |
| 3756 | |
| 3757 | if (charbuf >= charbuf_end) |
| 3758 | break; |
| 3759 | |
| 3760 | ONE_MORE_BYTE (c); |
| 3761 | |
| 3762 | if (c == '\r') |
| 3763 | { |
| 3764 | if (EQ (eol_type, Qdos)) |
| 3765 | { |
| 3766 | if (src == src_end) |
| 3767 | goto no_more_source; |
| 3768 | if (*src == '\n') |
| 3769 | ONE_MORE_BYTE (c); |
| 3770 | } |
| 3771 | else if (EQ (eol_type, Qmac)) |
| 3772 | c = '\n'; |
| 3773 | } |
| 3774 | else |
| 3775 | { |
| 3776 | struct charset *charset; |
| 3777 | if (c < 0x80) |
| 3778 | charset = charset_roman; |
| 3779 | else |
| 3780 | { |
| 3781 | /* BIG5 -> Big5 */ |
| 3782 | if (c < 0xA1 || c > 0xFE) |
| 3783 | goto invalid_code; |
| 3784 | ONE_MORE_BYTE (c1); |
| 3785 | if (c1 < 0x40 || (c1 > 0x7E && c1 < 0xA1) || c1 > 0xFE) |
| 3786 | goto invalid_code; |
| 3787 | c = c << 8 | c1; |
| 3788 | charset = charset_big5; |
| 3789 | } |
| 3790 | CODING_DECODE_CHAR (coding, src, src_base, src_end, charset, c, c); |
| 3791 | } |
| 3792 | |
| 3793 | *charbuf++ = c; |
| 3794 | continue; |
| 3795 | |
| 3796 | invalid_code: |
| 3797 | src = src_base; |
| 3798 | consumed_chars = consumed_chars_base; |
| 3799 | ONE_MORE_BYTE (c); |
| 3800 | *charbuf++ = ASCII_BYTE_P (c) ? c : BYTE8_TO_CHAR (c); |
| 3801 | coding->errors++; |
| 3802 | } |
| 3803 | |
| 3804 | no_more_source: |
| 3805 | coding->consumed_char += consumed_chars_base; |
| 3806 | coding->consumed = src_base - coding->source; |
| 3807 | coding->charbuf_used = charbuf - coding->charbuf; |
| 3808 | } |
| 3809 | |
| 3810 | /* See the above "GENERAL NOTES on `encode_coding_XXX ()' functions". |
| 3811 | This function can encode charsets `ascii', `katakana-jisx0201', |
| 3812 | `japanese-jisx0208', `chinese-big5-1', and `chinese-big5-2'. We |
| 3813 | are sure that all these charsets are registered as official charset |
| 3814 | (i.e. do not have extended leading-codes). Characters of other |
| 3815 | charsets are produced without any encoding. If SJIS_P is 1, encode |
| 3816 | SJIS text, else encode BIG5 text. */ |
| 3817 | |
| 3818 | static int |
| 3819 | encode_coding_sjis (coding) |
| 3820 | struct coding_system *coding; |
| 3821 | { |
| 3822 | int multibytep = coding->dst_multibyte; |
| 3823 | int *charbuf = coding->charbuf; |
| 3824 | int *charbuf_end = charbuf + coding->charbuf_used; |
| 3825 | unsigned char *dst = coding->destination + coding->produced; |
| 3826 | unsigned char *dst_end = coding->destination + coding->dst_bytes; |
| 3827 | int safe_room = 4; |
| 3828 | int produced_chars = 0; |
| 3829 | Lisp_Object attrs, eol_type, charset_list, val; |
| 3830 | int ascii_compatible; |
| 3831 | struct charset *charset_roman, *charset_kanji, *charset_kana; |
| 3832 | int c; |
| 3833 | |
| 3834 | CODING_GET_INFO (coding, attrs, eol_type, charset_list); |
| 3835 | val = charset_list; |
| 3836 | charset_roman = CHARSET_FROM_ID (XINT (XCAR (val))), val = XCDR (val); |
| 3837 | charset_kana = CHARSET_FROM_ID (XINT (XCAR (val))), val = XCDR (val); |
| 3838 | charset_kanji = CHARSET_FROM_ID (XINT (XCAR (val))); |
| 3839 | |
| 3840 | ascii_compatible = ! NILP (CODING_ATTR_ASCII_COMPAT (attrs)); |
| 3841 | |
| 3842 | while (charbuf < charbuf_end) |
| 3843 | { |
| 3844 | ASSURE_DESTINATION (safe_room); |
| 3845 | c = *charbuf++; |
| 3846 | /* Now encode the character C. */ |
| 3847 | if (ASCII_CHAR_P (c) && ascii_compatible) |
| 3848 | EMIT_ONE_ASCII_BYTE (c); |
| 3849 | else |
| 3850 | { |
| 3851 | unsigned code; |
| 3852 | struct charset *charset = char_charset (c, charset_list, &code); |
| 3853 | |
| 3854 | if (!charset) |
| 3855 | { |
| 3856 | c = coding->default_char; |
| 3857 | charset = char_charset (c, charset_list, &code); |
| 3858 | } |
| 3859 | if (code == CHARSET_INVALID_CODE (charset)) |
| 3860 | abort (); |
| 3861 | if (charset == charset_kanji) |
| 3862 | { |
| 3863 | int c1, c2; |
| 3864 | JIS_TO_SJIS (code); |
| 3865 | c1 = code >> 8, c2 = code & 0xFF; |
| 3866 | EMIT_TWO_BYTES (c1, c2); |
| 3867 | } |
| 3868 | else if (charset == charset_kana) |
| 3869 | EMIT_ONE_BYTE (code | 0x80); |
| 3870 | else |
| 3871 | EMIT_ONE_ASCII_BYTE (code & 0x7F); |
| 3872 | } |
| 3873 | } |
| 3874 | coding->result = CODING_RESULT_SUCCESS; |
| 3875 | coding->produced_char += produced_chars; |
| 3876 | coding->produced = dst - coding->destination; |
| 3877 | return 0; |
| 3878 | } |
| 3879 | |
| 3880 | static int |
| 3881 | encode_coding_big5 (coding) |
| 3882 | struct coding_system *coding; |
| 3883 | { |
| 3884 | int multibytep = coding->dst_multibyte; |
| 3885 | int *charbuf = coding->charbuf; |
| 3886 | int *charbuf_end = charbuf + coding->charbuf_used; |
| 3887 | unsigned char *dst = coding->destination + coding->produced; |
| 3888 | unsigned char *dst_end = coding->destination + coding->dst_bytes; |
| 3889 | int safe_room = 4; |
| 3890 | int produced_chars = 0; |
| 3891 | Lisp_Object attrs, eol_type, charset_list, val; |
| 3892 | int ascii_compatible; |
| 3893 | struct charset *charset_roman, *charset_big5; |
| 3894 | int c; |
| 3895 | |
| 3896 | CODING_GET_INFO (coding, attrs, eol_type, charset_list); |
| 3897 | val = charset_list; |
| 3898 | charset_roman = CHARSET_FROM_ID (XINT (XCAR (val))), val = XCDR (val); |
| 3899 | charset_big5 = CHARSET_FROM_ID (XINT (XCAR (val))); |
| 3900 | ascii_compatible = ! NILP (CODING_ATTR_ASCII_COMPAT (attrs)); |
| 3901 | |
| 3902 | while (charbuf < charbuf_end) |
| 3903 | { |
| 3904 | ASSURE_DESTINATION (safe_room); |
| 3905 | c = *charbuf++; |
| 3906 | /* Now encode the character C. */ |
| 3907 | if (ASCII_CHAR_P (c) && ascii_compatible) |
| 3908 | EMIT_ONE_ASCII_BYTE (c); |
| 3909 | else |
| 3910 | { |
| 3911 | unsigned code; |
| 3912 | struct charset *charset = char_charset (c, charset_list, &code); |
| 3913 | |
| 3914 | if (! charset) |
| 3915 | { |
| 3916 | c = coding->default_char; |
| 3917 | charset = char_charset (c, charset_list, &code); |
| 3918 | } |
| 3919 | if (code == CHARSET_INVALID_CODE (charset)) |
| 3920 | abort (); |
| 3921 | if (charset == charset_big5) |
| 3922 | { |
| 3923 | int c1, c2; |
| 3924 | |
| 3925 | c1 = code >> 8, c2 = code & 0xFF; |
| 3926 | EMIT_TWO_BYTES (c1, c2); |
| 3927 | } |
| 3928 | else |
| 3929 | EMIT_ONE_ASCII_BYTE (code & 0x7F); |
| 3930 | } |
| 3931 | } |
| 3932 | coding->result = CODING_RESULT_SUCCESS; |
| 3933 | coding->produced_char += produced_chars; |
| 3934 | coding->produced = dst - coding->destination; |
| 3935 | return 0; |
| 3936 | } |
| 3937 | |
| 3938 | \f |
| 3939 | /*** 10. CCL handlers ***/ |
| 3940 | |
| 3941 | /* See the above "GENERAL NOTES on `detect_coding_XXX ()' functions". |
| 3942 | Check if a text is encoded in a coding system of which |
| 3943 | encoder/decoder are written in CCL program. If it is, return |
| 3944 | CATEGORY_MASK_CCL, else return 0. */ |
| 3945 | |
| 3946 | static int |
| 3947 | detect_coding_ccl (coding, mask) |
| 3948 | struct coding_system *coding; |
| 3949 | int *mask; |
| 3950 | { |
| 3951 | unsigned char *src = coding->source, *src_base = src; |
| 3952 | unsigned char *src_end = coding->source + coding->src_bytes; |
| 3953 | int multibytep = coding->src_multibyte; |
| 3954 | int consumed_chars = 0; |
| 3955 | int found = 0; |
| 3956 | unsigned char *valids = CODING_CCL_VALIDS (coding); |
| 3957 | int head_ascii = coding->head_ascii; |
| 3958 | Lisp_Object attrs; |
| 3959 | |
| 3960 | coding = &coding_categories[coding_category_ccl]; |
| 3961 | attrs = CODING_ID_ATTRS (coding->id); |
| 3962 | if (! NILP (CODING_ATTR_ASCII_COMPAT (attrs))) |
| 3963 | src += head_ascii; |
| 3964 | |
| 3965 | while (1) |
| 3966 | { |
| 3967 | int c; |
| 3968 | ONE_MORE_BYTE (c); |
| 3969 | if (! valids[c]) |
| 3970 | break; |
| 3971 | if (!found && valids[c] > 1) |
| 3972 | found = 1; |
| 3973 | } |
| 3974 | *mask &= ~CATEGORY_MASK_CCL; |
| 3975 | return 0; |
| 3976 | |
| 3977 | no_more_source: |
| 3978 | if (!found) |
| 3979 | return 0; |
| 3980 | *mask &= CATEGORY_MASK_CCL; |
| 3981 | return 1; |
| 3982 | } |
| 3983 | |
| 3984 | static void |
| 3985 | decode_coding_ccl (coding) |
| 3986 | struct coding_system *coding; |
| 3987 | { |
| 3988 | unsigned char *src = coding->source + coding->consumed; |
| 3989 | unsigned char *src_end = coding->source + coding->src_bytes; |
| 3990 | int *charbuf = coding->charbuf; |
| 3991 | int *charbuf_end = charbuf + coding->charbuf_size; |
| 3992 | int consumed_chars = 0; |
| 3993 | int multibytep = coding->src_multibyte; |
| 3994 | struct ccl_program ccl; |
| 3995 | int source_charbuf[1024]; |
| 3996 | int source_byteidx[1024]; |
| 3997 | |
| 3998 | setup_ccl_program (&ccl, CODING_CCL_DECODER (coding)); |
| 3999 | |
| 4000 | while (src < src_end) |
| 4001 | { |
| 4002 | unsigned char *p = src; |
| 4003 | int *source, *source_end; |
| 4004 | int i = 0; |
| 4005 | |
| 4006 | if (multibytep) |
| 4007 | while (i < 1024 && p < src_end) |
| 4008 | { |
| 4009 | source_byteidx[i] = p - src; |
| 4010 | source_charbuf[i++] = STRING_CHAR_ADVANCE (p); |
| 4011 | } |
| 4012 | else |
| 4013 | while (i < 1024 && p < src_end) |
| 4014 | source_charbuf[i++] = *p++; |
| 4015 | |
| 4016 | if (p == src_end && coding->mode & CODING_MODE_LAST_BLOCK) |
| 4017 | ccl.last_block = 1; |
| 4018 | |
| 4019 | source = source_charbuf; |
| 4020 | source_end = source + i; |
| 4021 | while (source < source_end) |
| 4022 | { |
| 4023 | ccl_driver (&ccl, source, charbuf, |
| 4024 | source_end - source, charbuf_end - charbuf); |
| 4025 | source += ccl.consumed; |
| 4026 | charbuf += ccl.produced; |
| 4027 | if (ccl.status != CCL_STAT_SUSPEND_BY_DST) |
| 4028 | break; |
| 4029 | } |
| 4030 | if (source < source_end) |
| 4031 | src += source_byteidx[source - source_charbuf]; |
| 4032 | else |
| 4033 | src = p; |
| 4034 | consumed_chars += source - source_charbuf; |
| 4035 | |
| 4036 | if (ccl.status != CCL_STAT_SUSPEND_BY_SRC |
| 4037 | && ccl.status != CODING_RESULT_INSUFFICIENT_SRC) |
| 4038 | break; |
| 4039 | } |
| 4040 | |
| 4041 | switch (ccl.status) |
| 4042 | { |
| 4043 | case CCL_STAT_SUSPEND_BY_SRC: |
| 4044 | coding->result = CODING_RESULT_INSUFFICIENT_SRC; |
| 4045 | break; |
| 4046 | case CCL_STAT_SUSPEND_BY_DST: |
| 4047 | break; |
| 4048 | case CCL_STAT_QUIT: |
| 4049 | case CCL_STAT_INVALID_CMD: |
| 4050 | coding->result = CODING_RESULT_INTERRUPT; |
| 4051 | break; |
| 4052 | default: |
| 4053 | coding->result = CODING_RESULT_SUCCESS; |
| 4054 | break; |
| 4055 | } |
| 4056 | coding->consumed_char += consumed_chars; |
| 4057 | coding->consumed = src - coding->source; |
| 4058 | coding->charbuf_used = charbuf - coding->charbuf; |
| 4059 | } |
| 4060 | |
| 4061 | static int |
| 4062 | encode_coding_ccl (coding) |
| 4063 | struct coding_system *coding; |
| 4064 | { |
| 4065 | struct ccl_program ccl; |
| 4066 | int multibytep = coding->dst_multibyte; |
| 4067 | int *charbuf = coding->charbuf; |
| 4068 | int *charbuf_end = charbuf + coding->charbuf_used; |
| 4069 | unsigned char *dst = coding->destination + coding->produced; |
| 4070 | unsigned char *dst_end = coding->destination + coding->dst_bytes; |
| 4071 | unsigned char *adjusted_dst_end = dst_end - 1; |
| 4072 | int destination_charbuf[1024]; |
| 4073 | int i, produced_chars = 0; |
| 4074 | |
| 4075 | setup_ccl_program (&ccl, CODING_CCL_ENCODER (coding)); |
| 4076 | |
| 4077 | ccl.last_block = coding->mode & CODING_MODE_LAST_BLOCK; |
| 4078 | ccl.dst_multibyte = coding->dst_multibyte; |
| 4079 | |
| 4080 | while (charbuf < charbuf_end && dst < adjusted_dst_end) |
| 4081 | { |
| 4082 | int dst_bytes = dst_end - dst; |
| 4083 | if (dst_bytes > 1024) |
| 4084 | dst_bytes = 1024; |
| 4085 | |
| 4086 | ccl_driver (&ccl, charbuf, destination_charbuf, |
| 4087 | charbuf_end - charbuf, dst_bytes); |
| 4088 | charbuf += ccl.consumed; |
| 4089 | if (multibytep) |
| 4090 | for (i = 0; i < ccl.produced; i++) |
| 4091 | EMIT_ONE_BYTE (destination_charbuf[i] & 0xFF); |
| 4092 | else |
| 4093 | { |
| 4094 | for (i = 0; i < ccl.produced; i++) |
| 4095 | *dst++ = destination_charbuf[i] & 0xFF; |
| 4096 | produced_chars += ccl.produced; |
| 4097 | } |
| 4098 | } |
| 4099 | |
| 4100 | switch (ccl.status) |
| 4101 | { |
| 4102 | case CCL_STAT_SUSPEND_BY_SRC: |
| 4103 | coding->result = CODING_RESULT_INSUFFICIENT_SRC; |
| 4104 | break; |
| 4105 | case CCL_STAT_SUSPEND_BY_DST: |
| 4106 | coding->result = CODING_RESULT_INSUFFICIENT_DST; |
| 4107 | break; |
| 4108 | case CCL_STAT_QUIT: |
| 4109 | case CCL_STAT_INVALID_CMD: |
| 4110 | coding->result = CODING_RESULT_INTERRUPT; |
| 4111 | break; |
| 4112 | default: |
| 4113 | coding->result = CODING_RESULT_SUCCESS; |
| 4114 | break; |
| 4115 | } |
| 4116 | |
| 4117 | coding->produced_char += produced_chars; |
| 4118 | coding->produced = dst - coding->destination; |
| 4119 | return 0; |
| 4120 | } |
| 4121 | |
| 4122 | |
| 4123 | \f |
| 4124 | /*** 10, 11. no-conversion handlers ***/ |
| 4125 | |
| 4126 | /* See the above "GENERAL NOTES on `decode_coding_XXX ()' functions". */ |
| 4127 | |
| 4128 | static void |
| 4129 | decode_coding_raw_text (coding) |
| 4130 | struct coding_system *coding; |
| 4131 | { |
| 4132 | coding->chars_at_source = 1; |
| 4133 | coding->consumed_char = coding->src_chars; |
| 4134 | coding->consumed = coding->src_bytes; |
| 4135 | coding->result = CODING_RESULT_SUCCESS; |
| 4136 | } |
| 4137 | |
| 4138 | static int |
| 4139 | encode_coding_raw_text (coding) |
| 4140 | struct coding_system *coding; |
| 4141 | { |
| 4142 | int multibytep = coding->dst_multibyte; |
| 4143 | int *charbuf = coding->charbuf; |
| 4144 | int *charbuf_end = coding->charbuf + coding->charbuf_used; |
| 4145 | unsigned char *dst = coding->destination + coding->produced; |
| 4146 | unsigned char *dst_end = coding->destination + coding->dst_bytes; |
| 4147 | int produced_chars = 0; |
| 4148 | int c; |
| 4149 | |
| 4150 | if (multibytep) |
| 4151 | { |
| 4152 | int safe_room = MAX_MULTIBYTE_LENGTH * 2; |
| 4153 | |
| 4154 | if (coding->src_multibyte) |
| 4155 | while (charbuf < charbuf_end) |
| 4156 | { |
| 4157 | ASSURE_DESTINATION (safe_room); |
| 4158 | c = *charbuf++; |
| 4159 | if (ASCII_CHAR_P (c)) |
| 4160 | EMIT_ONE_ASCII_BYTE (c); |
| 4161 | else if (CHAR_BYTE8_P (c)) |
| 4162 | { |
| 4163 | c = CHAR_TO_BYTE8 (c); |
| 4164 | EMIT_ONE_BYTE (c); |
| 4165 | } |
| 4166 | else |
| 4167 | { |
| 4168 | unsigned char str[MAX_MULTIBYTE_LENGTH], *p0 = str, *p1 = str; |
| 4169 | |
| 4170 | CHAR_STRING_ADVANCE (c, p1); |
| 4171 | while (p0 < p1) |
| 4172 | EMIT_ONE_BYTE (*p0); |
| 4173 | } |
| 4174 | } |
| 4175 | else |
| 4176 | while (charbuf < charbuf_end) |
| 4177 | { |
| 4178 | ASSURE_DESTINATION (safe_room); |
| 4179 | c = *charbuf++; |
| 4180 | EMIT_ONE_BYTE (c); |
| 4181 | } |
| 4182 | } |
| 4183 | else |
| 4184 | { |
| 4185 | if (coding->src_multibyte) |
| 4186 | { |
| 4187 | int safe_room = MAX_MULTIBYTE_LENGTH; |
| 4188 | |
| 4189 | while (charbuf < charbuf_end) |
| 4190 | { |
| 4191 | ASSURE_DESTINATION (safe_room); |
| 4192 | c = *charbuf++; |
| 4193 | if (ASCII_CHAR_P (c)) |
| 4194 | *dst++ = c; |
| 4195 | else if (CHAR_BYTE8_P (c)) |
| 4196 | *dst++ = CHAR_TO_BYTE8 (c); |
| 4197 | else |
| 4198 | CHAR_STRING_ADVANCE (c, dst); |
| 4199 | produced_chars++; |
| 4200 | } |
| 4201 | } |
| 4202 | else |
| 4203 | { |
| 4204 | ASSURE_DESTINATION (charbuf_end - charbuf); |
| 4205 | while (charbuf < charbuf_end && dst < dst_end) |
| 4206 | *dst++ = *charbuf++; |
| 4207 | produced_chars = dst - (coding->destination + coding->dst_bytes); |
| 4208 | } |
| 4209 | } |
| 4210 | coding->result = CODING_RESULT_SUCCESS; |
| 4211 | coding->produced_char += produced_chars; |
| 4212 | coding->produced = dst - coding->destination; |
| 4213 | return 0; |
| 4214 | } |
| 4215 | |
| 4216 | static int |
| 4217 | detect_coding_charset (coding, mask) |
| 4218 | struct coding_system *coding; |
| 4219 | int *mask; |
| 4220 | { |
| 4221 | unsigned char *src = coding->source, *src_base = src; |
| 4222 | unsigned char *src_end = coding->source + coding->src_bytes; |
| 4223 | int multibytep = coding->src_multibyte; |
| 4224 | int consumed_chars = 0; |
| 4225 | Lisp_Object attrs, valids; |
| 4226 | |
| 4227 | coding = &coding_categories[coding_category_charset]; |
| 4228 | attrs = CODING_ID_ATTRS (coding->id); |
| 4229 | valids = AREF (attrs, coding_attr_charset_valids); |
| 4230 | |
| 4231 | if (! NILP (CODING_ATTR_ASCII_COMPAT (attrs))) |
| 4232 | src += coding->head_ascii; |
| 4233 | |
| 4234 | while (1) |
| 4235 | { |
| 4236 | int c; |
| 4237 | |
| 4238 | ONE_MORE_BYTE (c); |
| 4239 | if (NILP (AREF (valids, c))) |
| 4240 | break; |
| 4241 | } |
| 4242 | *mask &= ~CATEGORY_MASK_CHARSET; |
| 4243 | return 0; |
| 4244 | |
| 4245 | no_more_source: |
| 4246 | *mask &= CATEGORY_MASK_CHARSET; |
| 4247 | return 1; |
| 4248 | } |
| 4249 | |
| 4250 | static void |
| 4251 | decode_coding_charset (coding) |
| 4252 | struct coding_system *coding; |
| 4253 | { |
| 4254 | unsigned char *src = coding->source + coding->consumed; |
| 4255 | unsigned char *src_end = coding->source + coding->src_bytes; |
| 4256 | unsigned char *src_base; |
| 4257 | int *charbuf = coding->charbuf; |
| 4258 | int *charbuf_end = charbuf + coding->charbuf_size; |
| 4259 | int consumed_chars = 0, consumed_chars_base; |
| 4260 | int multibytep = coding->src_multibyte; |
| 4261 | struct charset *charset; |
| 4262 | Lisp_Object attrs, eol_type, charset_list; |
| 4263 | |
| 4264 | CODING_GET_INFO (coding, attrs, eol_type, charset_list); |
| 4265 | charset = CHARSET_FROM_ID (XINT (XCAR (charset_list))); |
| 4266 | |
| 4267 | while (1) |
| 4268 | { |
| 4269 | int c, c1; |
| 4270 | |
| 4271 | src_base = src; |
| 4272 | consumed_chars_base = consumed_chars; |
| 4273 | |
| 4274 | if (charbuf >= charbuf_end) |
| 4275 | break; |
| 4276 | |
| 4277 | ONE_MORE_BYTE (c1); |
| 4278 | if (c == '\r') |
| 4279 | { |
| 4280 | if (EQ (eol_type, Qdos)) |
| 4281 | { |
| 4282 | if (src == src_end) |
| 4283 | goto no_more_source; |
| 4284 | if (*src == '\n') |
| 4285 | ONE_MORE_BYTE (c); |
| 4286 | } |
| 4287 | else if (EQ (eol_type, Qmac)) |
| 4288 | c = '\n'; |
| 4289 | } |
| 4290 | else |
| 4291 | { |
| 4292 | CODING_DECODE_CHAR (coding, src, src_base, src_end, charset, c1, c); |
| 4293 | if (c < 0) |
| 4294 | goto invalid_code; |
| 4295 | } |
| 4296 | *charbuf++ = c; |
| 4297 | continue; |
| 4298 | |
| 4299 | invalid_code: |
| 4300 | src = src_base; |
| 4301 | consumed_chars = consumed_chars_base; |
| 4302 | ONE_MORE_BYTE (c); |
| 4303 | *charbuf++ = ASCII_BYTE_P (c) ? c : BYTE8_TO_CHAR (c); |
| 4304 | coding->errors++; |
| 4305 | } |
| 4306 | |
| 4307 | no_more_source: |
| 4308 | coding->consumed_char += consumed_chars_base; |
| 4309 | coding->consumed = src_base - coding->source; |
| 4310 | coding->charbuf_used = charbuf - coding->charbuf; |
| 4311 | } |
| 4312 | |
| 4313 | static int |
| 4314 | encode_coding_charset (coding) |
| 4315 | struct coding_system *coding; |
| 4316 | { |
| 4317 | int multibytep = coding->dst_multibyte; |
| 4318 | int *charbuf = coding->charbuf; |
| 4319 | int *charbuf_end = charbuf + coding->charbuf_used; |
| 4320 | unsigned char *dst = coding->destination + coding->produced; |
| 4321 | unsigned char *dst_end = coding->destination + coding->dst_bytes; |
| 4322 | int safe_room = MAX_MULTIBYTE_LENGTH; |
| 4323 | int produced_chars = 0; |
| 4324 | struct charset *charset; |
| 4325 | Lisp_Object attrs, eol_type, charset_list; |
| 4326 | int ascii_compatible; |
| 4327 | int c; |
| 4328 | |
| 4329 | CODING_GET_INFO (coding, attrs, eol_type, charset_list); |
| 4330 | charset = CHARSET_FROM_ID (XINT (XCAR (charset_list))); |
| 4331 | ascii_compatible = ! NILP (CODING_ATTR_ASCII_COMPAT (attrs)); |
| 4332 | |
| 4333 | while (charbuf < charbuf_end) |
| 4334 | { |
| 4335 | unsigned code; |
| 4336 | |
| 4337 | ASSURE_DESTINATION (safe_room); |
| 4338 | c = *charbuf++; |
| 4339 | if (ascii_compatible && ASCII_CHAR_P (c)) |
| 4340 | EMIT_ONE_ASCII_BYTE (c); |
| 4341 | else if ((code = ENCODE_CHAR (charset, c)) |
| 4342 | != CHARSET_INVALID_CODE (charset)) |
| 4343 | EMIT_ONE_BYTE (code); |
| 4344 | else |
| 4345 | EMIT_ONE_BYTE (coding->default_char); |
| 4346 | } |
| 4347 | |
| 4348 | coding->result = CODING_RESULT_SUCCESS; |
| 4349 | coding->produced_char += produced_chars; |
| 4350 | coding->produced = dst - coding->destination; |
| 4351 | return 0; |
| 4352 | } |
| 4353 | |
| 4354 | \f |
| 4355 | /*** 7. C library functions ***/ |
| 4356 | |
| 4357 | /* In Emacs Lisp, coding system is represented by a Lisp symbol which |
| 4358 | has a property `coding-system'. The value of this property is a |
| 4359 | vector of length 5 (called as coding-vector). Among elements of |
| 4360 | this vector, the first (element[0]) and the fifth (element[4]) |
| 4361 | carry important information for decoding/encoding. Before |
| 4362 | decoding/encoding, this information should be set in fields of a |
| 4363 | structure of type `coding_system'. |
| 4364 | |
| 4365 | A value of property `coding-system' can be a symbol of another |
| 4366 | subsidiary coding-system. In that case, Emacs gets coding-vector |
| 4367 | from that symbol. |
| 4368 | |
| 4369 | `element[0]' contains information to be set in `coding->type'. The |
| 4370 | value and its meaning is as follows: |
| 4371 | |
| 4372 | 0 -- coding_type_emacs_mule |
| 4373 | 1 -- coding_type_sjis |
| 4374 | 2 -- coding_type_iso_2022 |
| 4375 | 3 -- coding_type_big5 |
| 4376 | 4 -- coding_type_ccl encoder/decoder written in CCL |
| 4377 | nil -- coding_type_no_conversion |
| 4378 | t -- coding_type_undecided (automatic conversion on decoding, |
| 4379 | no-conversion on encoding) |
| 4380 | |
| 4381 | `element[4]' contains information to be set in `coding->flags' and |
| 4382 | `coding->spec'. The meaning varies by `coding->type'. |
| 4383 | |
| 4384 | If `coding->type' is `coding_type_iso_2022', element[4] is a vector |
| 4385 | of length 32 (of which the first 13 sub-elements are used now). |
| 4386 | Meanings of these sub-elements are: |
| 4387 | |
| 4388 | sub-element[N] where N is 0 through 3: to be set in `coding->spec.iso_2022' |
| 4389 | If the value is an integer of valid charset, the charset is |
| 4390 | assumed to be designated to graphic register N initially. |
| 4391 | |
| 4392 | If the value is minus, it is a minus value of charset which |
| 4393 | reserves graphic register N, which means that the charset is |
| 4394 | not designated initially but should be designated to graphic |
| 4395 | register N just before encoding a character in that charset. |
| 4396 | |
| 4397 | If the value is nil, graphic register N is never used on |
| 4398 | encoding. |
| 4399 | |
| 4400 | sub-element[N] where N is 4 through 11: to be set in `coding->flags' |
| 4401 | Each value takes t or nil. See the section ISO2022 of |
| 4402 | `coding.h' for more information. |
| 4403 | |
| 4404 | If `coding->type' is `coding_type_big5', element[4] is t to denote |
| 4405 | BIG5-ETen or nil to denote BIG5-HKU. |
| 4406 | |
| 4407 | If `coding->type' takes the other value, element[4] is ignored. |
| 4408 | |
| 4409 | Emacs Lisp's coding system also carries information about format of |
| 4410 | end-of-line in a value of property `eol-type'. If the value is |
| 4411 | integer, 0 means eol_lf, 1 means eol_crlf, and 2 means eol_cr. If |
| 4412 | it is not integer, it should be a vector of subsidiary coding |
| 4413 | systems of which property `eol-type' has one of above values. |
| 4414 | |
| 4415 | */ |
| 4416 | |
| 4417 | /* Setup coding context CODING from information about CODING_SYSTEM. |
| 4418 | If CODING_SYSTEM is nil, `no-conversion' is assumed. If |
| 4419 | CODING_SYSTEM is invalid, signal an error. */ |
| 4420 | |
| 4421 | void |
| 4422 | setup_coding_system (coding_system, coding) |
| 4423 | Lisp_Object coding_system; |
| 4424 | struct coding_system *coding; |
| 4425 | { |
| 4426 | Lisp_Object attrs; |
| 4427 | Lisp_Object eol_type; |
| 4428 | Lisp_Object coding_type; |
| 4429 | Lisp_Object val; |
| 4430 | |
| 4431 | if (NILP (coding_system)) |
| 4432 | coding_system = Qno_conversion; |
| 4433 | |
| 4434 | CHECK_CODING_SYSTEM_GET_ID (coding_system, coding->id); |
| 4435 | |
| 4436 | attrs = CODING_ID_ATTRS (coding->id); |
| 4437 | eol_type = CODING_ID_EOL_TYPE (coding->id); |
| 4438 | |
| 4439 | coding->mode = 0; |
| 4440 | coding->head_ascii = -1; |
| 4441 | coding->common_flags |
| 4442 | = (VECTORP (eol_type) ? CODING_REQUIRE_DETECTION_MASK : 0); |
| 4443 | |
| 4444 | val = CODING_ATTR_SAFE_CHARSETS (attrs); |
| 4445 | coding->max_charset_id = XSTRING (val)->size - 1; |
| 4446 | coding->safe_charsets = (char *) XSTRING (val)->data; |
| 4447 | coding->default_char = XINT (CODING_ATTR_DEFAULT_CHAR (attrs)); |
| 4448 | |
| 4449 | coding_type = CODING_ATTR_TYPE (attrs); |
| 4450 | if (EQ (coding_type, Qundecided)) |
| 4451 | { |
| 4452 | coding->detector = NULL; |
| 4453 | coding->decoder = decode_coding_raw_text; |
| 4454 | coding->encoder = encode_coding_raw_text; |
| 4455 | coding->common_flags |= CODING_REQUIRE_DETECTION_MASK; |
| 4456 | } |
| 4457 | else if (EQ (coding_type, Qiso_2022)) |
| 4458 | { |
| 4459 | int i; |
| 4460 | int flags = XINT (AREF (attrs, coding_attr_iso_flags)); |
| 4461 | |
| 4462 | /* Invoke graphic register 0 to plane 0. */ |
| 4463 | CODING_ISO_INVOCATION (coding, 0) = 0; |
| 4464 | /* Invoke graphic register 1 to plane 1 if we can use 8-bit. */ |
| 4465 | CODING_ISO_INVOCATION (coding, 1) |
| 4466 | = (flags & CODING_ISO_FLAG_SEVEN_BITS ? -1 : 1); |
| 4467 | /* Setup the initial status of designation. */ |
| 4468 | for (i = 0; i < 4; i++) |
| 4469 | CODING_ISO_DESIGNATION (coding, i) = CODING_ISO_INITIAL (coding, i); |
| 4470 | /* Not single shifting initially. */ |
| 4471 | CODING_ISO_SINGLE_SHIFTING (coding) = 0; |
| 4472 | /* Beginning of buffer should also be regarded as bol. */ |
| 4473 | CODING_ISO_BOL (coding) = 1; |
| 4474 | coding->detector = detect_coding_iso_2022; |
| 4475 | coding->decoder = decode_coding_iso_2022; |
| 4476 | coding->encoder = encode_coding_iso_2022; |
| 4477 | if (flags & CODING_ISO_FLAG_SAFE) |
| 4478 | coding->mode |= CODING_MODE_SAFE_ENCODING; |
| 4479 | coding->common_flags |
| 4480 | |= (CODING_REQUIRE_DECODING_MASK | CODING_REQUIRE_ENCODING_MASK |
| 4481 | | CODING_REQUIRE_FLUSHING_MASK); |
| 4482 | if (flags & CODING_ISO_FLAG_COMPOSITION) |
| 4483 | coding->common_flags |= CODING_ANNOTATE_COMPOSITION_MASK; |
| 4484 | if (flags & CODING_ISO_FLAG_FULL_SUPPORT) |
| 4485 | { |
| 4486 | setup_iso_safe_charsets (attrs); |
| 4487 | val = CODING_ATTR_SAFE_CHARSETS (attrs); |
| 4488 | coding->max_charset_id = XSTRING (val)->size - 1; |
| 4489 | coding->safe_charsets = (char *) XSTRING (val)->data; |
| 4490 | } |
| 4491 | CODING_ISO_FLAGS (coding) = flags; |
| 4492 | } |
| 4493 | else if (EQ (coding_type, Qcharset)) |
| 4494 | { |
| 4495 | coding->detector = detect_coding_charset; |
| 4496 | coding->decoder = decode_coding_charset; |
| 4497 | coding->encoder = encode_coding_charset; |
| 4498 | coding->common_flags |
| 4499 | |= (CODING_REQUIRE_DECODING_MASK | CODING_REQUIRE_ENCODING_MASK); |
| 4500 | } |
| 4501 | else if (EQ (coding_type, Qutf_8)) |
| 4502 | { |
| 4503 | coding->detector = detect_coding_utf_8; |
| 4504 | coding->decoder = decode_coding_utf_8; |
| 4505 | coding->encoder = encode_coding_utf_8; |
| 4506 | coding->common_flags |
| 4507 | |= (CODING_REQUIRE_DECODING_MASK | CODING_REQUIRE_ENCODING_MASK); |
| 4508 | } |
| 4509 | else if (EQ (coding_type, Qutf_16)) |
| 4510 | { |
| 4511 | val = AREF (attrs, coding_attr_utf_16_bom); |
| 4512 | CODING_UTF_16_BOM (coding) = (CONSP (val) ? utf_16_detect_bom |
| 4513 | : EQ (val, Qt) ? utf_16_with_bom |
| 4514 | : utf_16_without_bom); |
| 4515 | val = AREF (attrs, coding_attr_utf_16_endian); |
| 4516 | CODING_UTF_16_ENDIAN (coding) = (NILP (val) ? utf_16_big_endian |
| 4517 | : utf_16_little_endian); |
| 4518 | CODING_UTF_16_SURROGATE (coding) = 0; |
| 4519 | coding->detector = detect_coding_utf_16; |
| 4520 | coding->decoder = decode_coding_utf_16; |
| 4521 | coding->encoder = encode_coding_utf_16; |
| 4522 | coding->common_flags |
| 4523 | |= (CODING_REQUIRE_DECODING_MASK | CODING_REQUIRE_ENCODING_MASK); |
| 4524 | } |
| 4525 | else if (EQ (coding_type, Qccl)) |
| 4526 | { |
| 4527 | coding->detector = detect_coding_ccl; |
| 4528 | coding->decoder = decode_coding_ccl; |
| 4529 | coding->encoder = encode_coding_ccl; |
| 4530 | coding->common_flags |
| 4531 | |= (CODING_REQUIRE_DECODING_MASK | CODING_REQUIRE_ENCODING_MASK |
| 4532 | | CODING_REQUIRE_FLUSHING_MASK); |
| 4533 | } |
| 4534 | else if (EQ (coding_type, Qemacs_mule)) |
| 4535 | { |
| 4536 | coding->detector = detect_coding_emacs_mule; |
| 4537 | coding->decoder = decode_coding_emacs_mule; |
| 4538 | coding->encoder = encode_coding_emacs_mule; |
| 4539 | coding->common_flags |
| 4540 | |= (CODING_REQUIRE_DECODING_MASK | CODING_REQUIRE_ENCODING_MASK); |
| 4541 | if (! NILP (AREF (attrs, coding_attr_emacs_mule_full)) |
| 4542 | && ! EQ (CODING_ATTR_CHARSET_LIST (attrs), Vemacs_mule_charset_list)) |
| 4543 | { |
| 4544 | Lisp_Object tail, safe_charsets; |
| 4545 | int max_charset_id = 0; |
| 4546 | |
| 4547 | for (tail = Vemacs_mule_charset_list; CONSP (tail); |
| 4548 | tail = XCDR (tail)) |
| 4549 | if (max_charset_id < XFASTINT (XCAR (tail))) |
| 4550 | max_charset_id = XFASTINT (XCAR (tail)); |
| 4551 | safe_charsets = Fmake_string (make_number (max_charset_id + 1), |
| 4552 | make_number (255)); |
| 4553 | for (tail = Vemacs_mule_charset_list; CONSP (tail); |
| 4554 | tail = XCDR (tail)) |
| 4555 | XSTRING (safe_charsets)->data[XFASTINT (XCAR (tail))] = 0; |
| 4556 | coding->max_charset_id = max_charset_id; |
| 4557 | coding->safe_charsets = (char *) XSTRING (safe_charsets)->data; |
| 4558 | } |
| 4559 | } |
| 4560 | else if (EQ (coding_type, Qshift_jis)) |
| 4561 | { |
| 4562 | coding->detector = detect_coding_sjis; |
| 4563 | coding->decoder = decode_coding_sjis; |
| 4564 | coding->encoder = encode_coding_sjis; |
| 4565 | coding->common_flags |
| 4566 | |= (CODING_REQUIRE_DECODING_MASK | CODING_REQUIRE_ENCODING_MASK); |
| 4567 | } |
| 4568 | else if (EQ (coding_type, Qbig5)) |
| 4569 | { |
| 4570 | coding->detector = detect_coding_big5; |
| 4571 | coding->decoder = decode_coding_big5; |
| 4572 | coding->encoder = encode_coding_big5; |
| 4573 | coding->common_flags |
| 4574 | |= (CODING_REQUIRE_DECODING_MASK | CODING_REQUIRE_ENCODING_MASK); |
| 4575 | } |
| 4576 | else /* EQ (coding_type, Qraw_text) */ |
| 4577 | { |
| 4578 | coding->detector = NULL; |
| 4579 | coding->decoder = decode_coding_raw_text; |
| 4580 | coding->encoder = encode_coding_raw_text; |
| 4581 | coding->common_flags |= CODING_FOR_UNIBYTE_MASK; |
| 4582 | } |
| 4583 | |
| 4584 | return; |
| 4585 | } |
| 4586 | |
| 4587 | /* Return raw-text or one of its subsidiaries that has the same |
| 4588 | eol_type as CODING-SYSTEM. */ |
| 4589 | |
| 4590 | Lisp_Object |
| 4591 | raw_text_coding_system (coding_system) |
| 4592 | Lisp_Object coding_system; |
| 4593 | { |
| 4594 | Lisp_Object spec, attrs; |
| 4595 | Lisp_Object eol_type, raw_text_eol_type; |
| 4596 | |
| 4597 | spec = CODING_SYSTEM_SPEC (coding_system); |
| 4598 | attrs = AREF (spec, 0); |
| 4599 | |
| 4600 | if (EQ (CODING_ATTR_TYPE (attrs), Qraw_text)) |
| 4601 | return coding_system; |
| 4602 | |
| 4603 | eol_type = AREF (spec, 2); |
| 4604 | if (VECTORP (eol_type)) |
| 4605 | return Qraw_text; |
| 4606 | spec = CODING_SYSTEM_SPEC (Qraw_text); |
| 4607 | raw_text_eol_type = AREF (spec, 2); |
| 4608 | return (EQ (eol_type, Qunix) ? AREF (raw_text_eol_type, 0) |
| 4609 | : EQ (eol_type, Qdos) ? AREF (raw_text_eol_type, 1) |
| 4610 | : AREF (raw_text_eol_type, 2)); |
| 4611 | } |
| 4612 | |
| 4613 | |
| 4614 | /* If CODING_SYSTEM doesn't specify end-of-line format but PARENT |
| 4615 | does, return one of the subsidiary that has the same eol-spec as |
| 4616 | PARENT. Otherwise, return CODING_SYSTEM. */ |
| 4617 | |
| 4618 | Lisp_Object |
| 4619 | coding_inherit_eol_type (coding_system, parent) |
| 4620 | { |
| 4621 | Lisp_Object spec, attrs, eol_type; |
| 4622 | |
| 4623 | spec = CODING_SYSTEM_SPEC (coding_system); |
| 4624 | attrs = AREF (spec, 0); |
| 4625 | eol_type = AREF (spec, 2); |
| 4626 | if (VECTORP (eol_type)) |
| 4627 | { |
| 4628 | Lisp_Object parent_spec; |
| 4629 | Lisp_Object parent_eol_type; |
| 4630 | |
| 4631 | parent_spec |
| 4632 | = CODING_SYSTEM_SPEC (buffer_defaults.buffer_file_coding_system); |
| 4633 | parent_eol_type = AREF (parent_spec, 2); |
| 4634 | if (EQ (parent_eol_type, Qunix)) |
| 4635 | coding_system = AREF (eol_type, 0); |
| 4636 | else if (EQ (parent_eol_type, Qdos)) |
| 4637 | coding_system = AREF (eol_type, 1); |
| 4638 | else if (EQ (parent_eol_type, Qmac)) |
| 4639 | coding_system = AREF (eol_type, 2); |
| 4640 | } |
| 4641 | return coding_system; |
| 4642 | } |
| 4643 | |
| 4644 | /* Emacs has a mechanism to automatically detect a coding system if it |
| 4645 | is one of Emacs' internal format, ISO2022, SJIS, and BIG5. But, |
| 4646 | it's impossible to distinguish some coding systems accurately |
| 4647 | because they use the same range of codes. So, at first, coding |
| 4648 | systems are categorized into 7, those are: |
| 4649 | |
| 4650 | o coding-category-emacs-mule |
| 4651 | |
| 4652 | The category for a coding system which has the same code range |
| 4653 | as Emacs' internal format. Assigned the coding-system (Lisp |
| 4654 | symbol) `emacs-mule' by default. |
| 4655 | |
| 4656 | o coding-category-sjis |
| 4657 | |
| 4658 | The category for a coding system which has the same code range |
| 4659 | as SJIS. Assigned the coding-system (Lisp |
| 4660 | symbol) `japanese-shift-jis' by default. |
| 4661 | |
| 4662 | o coding-category-iso-7 |
| 4663 | |
| 4664 | The category for a coding system which has the same code range |
| 4665 | as ISO2022 of 7-bit environment. This doesn't use any locking |
| 4666 | shift and single shift functions. This can encode/decode all |
| 4667 | charsets. Assigned the coding-system (Lisp symbol) |
| 4668 | `iso-2022-7bit' by default. |
| 4669 | |
| 4670 | o coding-category-iso-7-tight |
| 4671 | |
| 4672 | Same as coding-category-iso-7 except that this can |
| 4673 | encode/decode only the specified charsets. |
| 4674 | |
| 4675 | o coding-category-iso-8-1 |
| 4676 | |
| 4677 | The category for a coding system which has the same code range |
| 4678 | as ISO2022 of 8-bit environment and graphic plane 1 used only |
| 4679 | for DIMENSION1 charset. This doesn't use any locking shift |
| 4680 | and single shift functions. Assigned the coding-system (Lisp |
| 4681 | symbol) `iso-latin-1' by default. |
| 4682 | |
| 4683 | o coding-category-iso-8-2 |
| 4684 | |
| 4685 | The category for a coding system which has the same code range |
| 4686 | as ISO2022 of 8-bit environment and graphic plane 1 used only |
| 4687 | for DIMENSION2 charset. This doesn't use any locking shift |
| 4688 | and single shift functions. Assigned the coding-system (Lisp |
| 4689 | symbol) `japanese-iso-8bit' by default. |
| 4690 | |
| 4691 | o coding-category-iso-7-else |
| 4692 | |
| 4693 | The category for a coding system which has the same code range |
| 4694 | as ISO2022 of 7-bit environemnt but uses locking shift or |
| 4695 | single shift functions. Assigned the coding-system (Lisp |
| 4696 | symbol) `iso-2022-7bit-lock' by default. |
| 4697 | |
| 4698 | o coding-category-iso-8-else |
| 4699 | |
| 4700 | The category for a coding system which has the same code range |
| 4701 | as ISO2022 of 8-bit environemnt but uses locking shift or |
| 4702 | single shift functions. Assigned the coding-system (Lisp |
| 4703 | symbol) `iso-2022-8bit-ss2' by default. |
| 4704 | |
| 4705 | o coding-category-big5 |
| 4706 | |
| 4707 | The category for a coding system which has the same code range |
| 4708 | as BIG5. Assigned the coding-system (Lisp symbol) |
| 4709 | `cn-big5' by default. |
| 4710 | |
| 4711 | o coding-category-utf-8 |
| 4712 | |
| 4713 | The category for a coding system which has the same code range |
| 4714 | as UTF-8 (cf. RFC2279). Assigned the coding-system (Lisp |
| 4715 | symbol) `utf-8' by default. |
| 4716 | |
| 4717 | o coding-category-utf-16-be |
| 4718 | |
| 4719 | The category for a coding system in which a text has an |
| 4720 | Unicode signature (cf. Unicode Standard) in the order of BIG |
| 4721 | endian at the head. Assigned the coding-system (Lisp symbol) |
| 4722 | `utf-16-be' by default. |
| 4723 | |
| 4724 | o coding-category-utf-16-le |
| 4725 | |
| 4726 | The category for a coding system in which a text has an |
| 4727 | Unicode signature (cf. Unicode Standard) in the order of |
| 4728 | LITTLE endian at the head. Assigned the coding-system (Lisp |
| 4729 | symbol) `utf-16-le' by default. |
| 4730 | |
| 4731 | o coding-category-ccl |
| 4732 | |
| 4733 | The category for a coding system of which encoder/decoder is |
| 4734 | written in CCL programs. The default value is nil, i.e., no |
| 4735 | coding system is assigned. |
| 4736 | |
| 4737 | o coding-category-binary |
| 4738 | |
| 4739 | The category for a coding system not categorized in any of the |
| 4740 | above. Assigned the coding-system (Lisp symbol) |
| 4741 | `no-conversion' by default. |
| 4742 | |
| 4743 | Each of them is a Lisp symbol and the value is an actual |
| 4744 | `coding-system's (this is also a Lisp symbol) assigned by a user. |
| 4745 | What Emacs does actually is to detect a category of coding system. |
| 4746 | Then, it uses a `coding-system' assigned to it. If Emacs can't |
| 4747 | decide only one possible category, it selects a category of the |
| 4748 | highest priority. Priorities of categories are also specified by a |
| 4749 | user in a Lisp variable `coding-category-list'. |
| 4750 | |
| 4751 | */ |
| 4752 | |
| 4753 | #define EOL_SEEN_NONE 0 |
| 4754 | #define EOL_SEEN_LF 1 |
| 4755 | #define EOL_SEEN_CR 2 |
| 4756 | #define EOL_SEEN_CRLF 4 |
| 4757 | |
| 4758 | /* Detect how end-of-line of a text of length CODING->src_bytes |
| 4759 | pointed by CODING->source is encoded. Return one of |
| 4760 | EOL_SEEN_XXX. */ |
| 4761 | |
| 4762 | #define MAX_EOL_CHECK_COUNT 3 |
| 4763 | |
| 4764 | static int |
| 4765 | detect_eol (coding, source, src_bytes) |
| 4766 | struct coding_system *coding; |
| 4767 | unsigned char *source; |
| 4768 | EMACS_INT src_bytes; |
| 4769 | { |
| 4770 | Lisp_Object attrs, coding_type; |
| 4771 | unsigned char *src = source, *src_end = src + src_bytes; |
| 4772 | unsigned char c; |
| 4773 | int total = 0; |
| 4774 | int eol_seen = EOL_SEEN_NONE; |
| 4775 | |
| 4776 | attrs = CODING_ID_ATTRS (coding->id); |
| 4777 | coding_type = CODING_ATTR_TYPE (attrs); |
| 4778 | |
| 4779 | if (EQ (coding_type, Qccl)) |
| 4780 | { |
| 4781 | int msb, lsb; |
| 4782 | |
| 4783 | msb = coding->spec.utf_16.endian == utf_16_little_endian; |
| 4784 | lsb = 1 - msb; |
| 4785 | |
| 4786 | while (src + 1 < src_end) |
| 4787 | { |
| 4788 | c = src[lsb]; |
| 4789 | if (src[msb] == 0 && (c == '\n' || c == '\r')) |
| 4790 | { |
| 4791 | int this_eol; |
| 4792 | |
| 4793 | if (c == '\n') |
| 4794 | this_eol = EOL_SEEN_LF; |
| 4795 | else if (src + 3 >= src_end |
| 4796 | || src[msb + 2] != 0 |
| 4797 | || src[lsb + 2] != '\n') |
| 4798 | this_eol = EOL_SEEN_CR; |
| 4799 | else |
| 4800 | this_eol = EOL_SEEN_CRLF; |
| 4801 | |
| 4802 | if (eol_seen == EOL_SEEN_NONE) |
| 4803 | /* This is the first end-of-line. */ |
| 4804 | eol_seen = this_eol; |
| 4805 | else if (eol_seen != this_eol) |
| 4806 | { |
| 4807 | /* The found type is different from what found before. */ |
| 4808 | eol_seen = EOL_SEEN_LF; |
| 4809 | break; |
| 4810 | } |
| 4811 | if (++total == MAX_EOL_CHECK_COUNT) |
| 4812 | break; |
| 4813 | } |
| 4814 | src += 2; |
| 4815 | } |
| 4816 | } |
| 4817 | else |
| 4818 | { |
| 4819 | while (src < src_end) |
| 4820 | { |
| 4821 | c = *src++; |
| 4822 | if (c == '\n' || c == '\r') |
| 4823 | { |
| 4824 | int this_eol; |
| 4825 | |
| 4826 | if (c == '\n') |
| 4827 | this_eol = EOL_SEEN_LF; |
| 4828 | else if (src >= src_end || *src != '\n') |
| 4829 | this_eol = EOL_SEEN_CR; |
| 4830 | else |
| 4831 | this_eol = EOL_SEEN_CRLF, src++; |
| 4832 | |
| 4833 | if (eol_seen == EOL_SEEN_NONE) |
| 4834 | /* This is the first end-of-line. */ |
| 4835 | eol_seen = this_eol; |
| 4836 | else if (eol_seen != this_eol) |
| 4837 | { |
| 4838 | /* The found type is different from what found before. */ |
| 4839 | eol_seen = EOL_SEEN_LF; |
| 4840 | break; |
| 4841 | } |
| 4842 | if (++total == MAX_EOL_CHECK_COUNT) |
| 4843 | break; |
| 4844 | } |
| 4845 | } |
| 4846 | } |
| 4847 | return eol_seen; |
| 4848 | } |
| 4849 | |
| 4850 | |
| 4851 | static void |
| 4852 | adjust_coding_eol_type (coding, eol_seen) |
| 4853 | struct coding_system *coding; |
| 4854 | int eol_seen; |
| 4855 | { |
| 4856 | Lisp_Object eol_type; |
| 4857 | |
| 4858 | eol_type = CODING_ID_EOL_TYPE (coding->id); |
| 4859 | if (eol_seen & EOL_SEEN_LF) |
| 4860 | coding->id = CODING_SYSTEM_ID (AREF (eol_type, 0)); |
| 4861 | else if (eol_type & EOL_SEEN_CRLF) |
| 4862 | coding->id = CODING_SYSTEM_ID (AREF (eol_type, 1)); |
| 4863 | else if (eol_type & EOL_SEEN_CR) |
| 4864 | coding->id = CODING_SYSTEM_ID (AREF (eol_type, 2)); |
| 4865 | } |
| 4866 | |
| 4867 | /* Detect how a text specified in CODING is encoded. If a coding |
| 4868 | system is detected, update fields of CODING by the detected coding |
| 4869 | system. */ |
| 4870 | |
| 4871 | void |
| 4872 | detect_coding (coding) |
| 4873 | struct coding_system *coding; |
| 4874 | { |
| 4875 | unsigned char *src, *src_end; |
| 4876 | Lisp_Object attrs, coding_type; |
| 4877 | |
| 4878 | coding->consumed = coding->consumed_char = 0; |
| 4879 | coding->produced = coding->produced_char = 0; |
| 4880 | coding_set_source (coding); |
| 4881 | |
| 4882 | src_end = coding->source + coding->src_bytes; |
| 4883 | |
| 4884 | /* If we have not yet decided the text encoding type, detect it |
| 4885 | now. */ |
| 4886 | if (EQ (CODING_ATTR_TYPE (CODING_ID_ATTRS (coding->id)), Qundecided)) |
| 4887 | { |
| 4888 | int mask = CATEGORY_MASK_ANY; |
| 4889 | int c, i; |
| 4890 | |
| 4891 | for (src = coding->source; src < src_end; src++) |
| 4892 | { |
| 4893 | c = *src; |
| 4894 | if (c & 0x80 || (c < 0x20 && (c == ISO_CODE_ESC |
| 4895 | || c == ISO_CODE_SI |
| 4896 | || c == ISO_CODE_SO))) |
| 4897 | break; |
| 4898 | } |
| 4899 | coding->head_ascii = src - (coding->source + coding->consumed); |
| 4900 | |
| 4901 | if (coding->head_ascii < coding->src_bytes) |
| 4902 | { |
| 4903 | int detected = 0; |
| 4904 | |
| 4905 | for (i = 0; i < coding_category_raw_text; i++) |
| 4906 | { |
| 4907 | enum coding_category category = coding_priorities[i]; |
| 4908 | struct coding_system *this = coding_categories + category; |
| 4909 | |
| 4910 | if (category >= coding_category_raw_text |
| 4911 | || detected & (1 << category)) |
| 4912 | continue; |
| 4913 | |
| 4914 | if (this->id < 0) |
| 4915 | { |
| 4916 | /* No coding system of this category is defined. */ |
| 4917 | mask &= ~(1 << category); |
| 4918 | } |
| 4919 | else |
| 4920 | { |
| 4921 | detected |= detected_mask[category]; |
| 4922 | if ((*(this->detector)) (coding, &mask)) |
| 4923 | break; |
| 4924 | } |
| 4925 | } |
| 4926 | if (! mask) |
| 4927 | setup_coding_system (Qraw_text, coding); |
| 4928 | else if (mask != CATEGORY_MASK_ANY) |
| 4929 | for (i = 0; i < coding_category_raw_text; i++) |
| 4930 | { |
| 4931 | enum coding_category category = coding_priorities[i]; |
| 4932 | struct coding_system *this = coding_categories + category; |
| 4933 | |
| 4934 | if (mask & (1 << category)) |
| 4935 | { |
| 4936 | setup_coding_system (CODING_ID_NAME (this->id), coding); |
| 4937 | break; |
| 4938 | } |
| 4939 | } |
| 4940 | } |
| 4941 | } |
| 4942 | |
| 4943 | attrs = CODING_ID_ATTRS (coding->id); |
| 4944 | coding_type = CODING_ATTR_TYPE (attrs); |
| 4945 | |
| 4946 | /* If we have not yet decided the EOL type, detect it now. But, the |
| 4947 | detection is impossible for a CCL based coding system, in which |
| 4948 | case, we detct the EOL type after decoding. */ |
| 4949 | if (VECTORP (CODING_ID_EOL_TYPE (coding->id)) |
| 4950 | && ! EQ (coding_type, Qccl)) |
| 4951 | { |
| 4952 | int eol_seen = detect_eol (coding, coding->source, coding->src_bytes); |
| 4953 | |
| 4954 | if (eol_seen != EOL_SEEN_NONE) |
| 4955 | adjust_coding_eol_type (coding, eol_seen); |
| 4956 | } |
| 4957 | } |
| 4958 | |
| 4959 | |
| 4960 | static void |
| 4961 | decode_eol (coding) |
| 4962 | struct coding_system *coding; |
| 4963 | { |
| 4964 | if (VECTORP (CODING_ID_EOL_TYPE (coding->id))) |
| 4965 | { |
| 4966 | unsigned char *p = CHAR_POS_ADDR (coding->dst_pos); |
| 4967 | unsigned char *pend = p + coding->produced; |
| 4968 | int eol_seen = EOL_SEEN_NONE; |
| 4969 | |
| 4970 | for (; p < pend; p++) |
| 4971 | { |
| 4972 | if (*p == '\n') |
| 4973 | eol_seen |= EOL_SEEN_LF; |
| 4974 | else if (*p == '\r') |
| 4975 | { |
| 4976 | if (p + 1 < pend && *(p + 1) == '\n') |
| 4977 | { |
| 4978 | eol_seen |= EOL_SEEN_CRLF; |
| 4979 | p++; |
| 4980 | } |
| 4981 | else |
| 4982 | eol_seen |= EOL_SEEN_CR; |
| 4983 | } |
| 4984 | } |
| 4985 | if (eol_seen != EOL_SEEN_NONE) |
| 4986 | adjust_coding_eol_type (coding, eol_seen); |
| 4987 | } |
| 4988 | |
| 4989 | if (EQ (CODING_ID_EOL_TYPE (coding->id), Qmac)) |
| 4990 | { |
| 4991 | unsigned char *p = CHAR_POS_ADDR (coding->dst_pos); |
| 4992 | unsigned char *pend = p + coding->produced; |
| 4993 | |
| 4994 | for (; p < pend; p++) |
| 4995 | if (*p == '\r') |
| 4996 | *p = '\n'; |
| 4997 | } |
| 4998 | else if (EQ (CODING_ID_EOL_TYPE (coding->id), Qdos)) |
| 4999 | { |
| 5000 | unsigned char *p, *pbeg, *pend; |
| 5001 | Lisp_Object undo_list; |
| 5002 | |
| 5003 | move_gap_both (coding->dst_pos + coding->produced_char, |
| 5004 | coding->dst_pos_byte + coding->produced); |
| 5005 | undo_list = current_buffer->undo_list; |
| 5006 | current_buffer->undo_list = Qt; |
| 5007 | del_range_2 (coding->dst_pos, coding->dst_pos_byte, GPT, GPT_BYTE, Qnil); |
| 5008 | current_buffer->undo_list = undo_list; |
| 5009 | pbeg = GPT_ADDR; |
| 5010 | pend = pbeg + coding->produced; |
| 5011 | |
| 5012 | for (p = pend - 1; p >= pbeg; p--) |
| 5013 | if (*p == '\r') |
| 5014 | { |
| 5015 | safe_bcopy ((char *) (p + 1), (char *) p, pend - p - 1); |
| 5016 | pend--; |
| 5017 | } |
| 5018 | coding->produced_char -= coding->produced - (pend - pbeg); |
| 5019 | coding->produced = pend - pbeg; |
| 5020 | insert_from_gap (coding->produced_char, coding->produced); |
| 5021 | } |
| 5022 | } |
| 5023 | |
| 5024 | static void |
| 5025 | translate_chars (coding, table) |
| 5026 | struct coding_system *coding; |
| 5027 | Lisp_Object table; |
| 5028 | { |
| 5029 | int *charbuf = coding->charbuf; |
| 5030 | int *charbuf_end = charbuf + coding->charbuf_used; |
| 5031 | int c; |
| 5032 | |
| 5033 | if (coding->chars_at_source) |
| 5034 | return; |
| 5035 | |
| 5036 | while (charbuf < charbuf_end) |
| 5037 | { |
| 5038 | c = *charbuf; |
| 5039 | if (c < 0) |
| 5040 | charbuf += c; |
| 5041 | else |
| 5042 | *charbuf++ = translate_char (table, c); |
| 5043 | } |
| 5044 | } |
| 5045 | |
| 5046 | static int |
| 5047 | produce_chars (coding) |
| 5048 | struct coding_system *coding; |
| 5049 | { |
| 5050 | unsigned char *dst = coding->destination + coding->produced; |
| 5051 | unsigned char *dst_end = coding->destination + coding->dst_bytes; |
| 5052 | int produced; |
| 5053 | int produced_chars = 0; |
| 5054 | |
| 5055 | if (! coding->chars_at_source) |
| 5056 | { |
| 5057 | /* Characters are in coding->charbuf. */ |
| 5058 | int *buf = coding->charbuf; |
| 5059 | int *buf_end = buf + coding->charbuf_used; |
| 5060 | unsigned char *adjusted_dst_end; |
| 5061 | |
| 5062 | if (BUFFERP (coding->src_object) |
| 5063 | && EQ (coding->src_object, coding->dst_object)) |
| 5064 | dst_end = coding->source + coding->consumed; |
| 5065 | adjusted_dst_end = dst_end - MAX_MULTIBYTE_LENGTH; |
| 5066 | |
| 5067 | while (buf < buf_end) |
| 5068 | { |
| 5069 | int c = *buf++; |
| 5070 | |
| 5071 | if (dst >= adjusted_dst_end) |
| 5072 | { |
| 5073 | dst = alloc_destination (coding, |
| 5074 | buf_end - buf + MAX_MULTIBYTE_LENGTH, |
| 5075 | dst); |
| 5076 | dst_end = coding->destination + coding->dst_bytes; |
| 5077 | adjusted_dst_end = dst_end - MAX_MULTIBYTE_LENGTH; |
| 5078 | } |
| 5079 | if (c >= 0) |
| 5080 | { |
| 5081 | if (coding->dst_multibyte |
| 5082 | || ! CHAR_BYTE8_P (c)) |
| 5083 | CHAR_STRING_ADVANCE (c, dst); |
| 5084 | else |
| 5085 | *dst++ = CHAR_TO_BYTE8 (c); |
| 5086 | produced_chars++; |
| 5087 | } |
| 5088 | else |
| 5089 | /* This is an annotation data. */ |
| 5090 | buf -= c + 1; |
| 5091 | } |
| 5092 | } |
| 5093 | else |
| 5094 | { |
| 5095 | int multibytep = coding->src_multibyte; |
| 5096 | unsigned char *src = coding->source; |
| 5097 | unsigned char *src_end = src + coding->src_bytes; |
| 5098 | Lisp_Object eol_type; |
| 5099 | |
| 5100 | eol_type = CODING_ID_EOL_TYPE (coding->id); |
| 5101 | |
| 5102 | if (coding->src_multibyte != coding->dst_multibyte) |
| 5103 | { |
| 5104 | if (coding->src_multibyte) |
| 5105 | { |
| 5106 | int consumed_chars; |
| 5107 | |
| 5108 | while (1) |
| 5109 | { |
| 5110 | unsigned char *src_base = src; |
| 5111 | int c; |
| 5112 | |
| 5113 | ONE_MORE_BYTE (c); |
| 5114 | if (c == '\r') |
| 5115 | { |
| 5116 | if (EQ (eol_type, Qdos)) |
| 5117 | { |
| 5118 | if (src < src_end |
| 5119 | && *src == '\n') |
| 5120 | c = *src++; |
| 5121 | } |
| 5122 | else if (EQ (eol_type, Qmac)) |
| 5123 | c = '\n'; |
| 5124 | } |
| 5125 | if (dst == dst_end) |
| 5126 | { |
| 5127 | EMACS_INT offset = src - coding->source; |
| 5128 | |
| 5129 | dst = alloc_destination (coding, src_end - src + 1, dst); |
| 5130 | dst_end = coding->destination + coding->dst_bytes; |
| 5131 | coding_set_source (coding); |
| 5132 | src = coding->source + offset; |
| 5133 | src_end = coding->source + coding->src_bytes; |
| 5134 | } |
| 5135 | *dst++ = c; |
| 5136 | produced_chars++; |
| 5137 | } |
| 5138 | no_more_source: |
| 5139 | ; |
| 5140 | } |
| 5141 | else |
| 5142 | while (src < src_end) |
| 5143 | { |
| 5144 | int c = *src++; |
| 5145 | |
| 5146 | if (c == '\r') |
| 5147 | { |
| 5148 | if (EQ (eol_type, Qdos)) |
| 5149 | { |
| 5150 | if (src < src_end |
| 5151 | && *src == '\n') |
| 5152 | c = *src++; |
| 5153 | } |
| 5154 | else if (EQ (eol_type, Qmac)) |
| 5155 | c = '\n'; |
| 5156 | } |
| 5157 | if (dst >= dst_end - 1) |
| 5158 | { |
| 5159 | EMACS_INT offset = src - coding->source; |
| 5160 | |
| 5161 | dst = alloc_destination (coding, src_end - src + 2, dst); |
| 5162 | dst_end = coding->destination + coding->dst_bytes; |
| 5163 | coding_set_source (coding); |
| 5164 | src = coding->source + offset; |
| 5165 | src_end = coding->source + coding->src_bytes; |
| 5166 | } |
| 5167 | EMIT_ONE_BYTE (c); |
| 5168 | } |
| 5169 | } |
| 5170 | else |
| 5171 | { |
| 5172 | if (!EQ (coding->src_object, coding->dst_object)) |
| 5173 | { |
| 5174 | int require = coding->src_bytes - coding->dst_bytes; |
| 5175 | |
| 5176 | if (require > 0) |
| 5177 | { |
| 5178 | EMACS_INT offset = src - coding->source; |
| 5179 | |
| 5180 | dst = alloc_destination (coding, require, dst); |
| 5181 | coding_set_source (coding); |
| 5182 | src = coding->source + offset; |
| 5183 | src_end = coding->source + coding->src_bytes; |
| 5184 | } |
| 5185 | } |
| 5186 | produced_chars = coding->src_chars; |
| 5187 | while (src < src_end) |
| 5188 | { |
| 5189 | int c = *src++; |
| 5190 | |
| 5191 | if (c == '\r') |
| 5192 | { |
| 5193 | if (EQ (eol_type, Qdos)) |
| 5194 | { |
| 5195 | if (src < src_end |
| 5196 | && *src == '\n') |
| 5197 | c = *src++; |
| 5198 | produced_chars--; |
| 5199 | } |
| 5200 | else if (EQ (eol_type, Qmac)) |
| 5201 | c = '\n'; |
| 5202 | } |
| 5203 | *dst++ = c; |
| 5204 | } |
| 5205 | } |
| 5206 | } |
| 5207 | |
| 5208 | produced = dst - (coding->destination + coding->produced); |
| 5209 | if (BUFFERP (coding->dst_object)) |
| 5210 | insert_from_gap (produced_chars, produced); |
| 5211 | coding->produced += produced; |
| 5212 | coding->produced_char += produced_chars; |
| 5213 | return produced_chars; |
| 5214 | } |
| 5215 | |
| 5216 | /* [ -LENGTH CHAR_POS_OFFSET MASK METHOD COMP_LEN ] |
| 5217 | or |
| 5218 | [ -LENGTH CHAR_POS_OFFSET MASK METHOD COMP_LEN COMPONENTS... ] |
| 5219 | */ |
| 5220 | |
| 5221 | static INLINE void |
| 5222 | produce_composition (coding, charbuf) |
| 5223 | struct coding_system *coding; |
| 5224 | int *charbuf; |
| 5225 | { |
| 5226 | Lisp_Object buffer; |
| 5227 | int len; |
| 5228 | EMACS_INT pos; |
| 5229 | enum composition_method method; |
| 5230 | int cmp_len; |
| 5231 | Lisp_Object components; |
| 5232 | |
| 5233 | buffer = coding->dst_object; |
| 5234 | len = -charbuf[0]; |
| 5235 | pos = coding->dst_pos + charbuf[1]; |
| 5236 | method = (enum composition_method) (charbuf[3]); |
| 5237 | cmp_len = charbuf[4]; |
| 5238 | |
| 5239 | if (method == COMPOSITION_RELATIVE) |
| 5240 | components = Qnil; |
| 5241 | else |
| 5242 | { |
| 5243 | Lisp_Object args[MAX_COMPOSITION_COMPONENTS * 2 - 1]; |
| 5244 | int i; |
| 5245 | |
| 5246 | len -= 5; |
| 5247 | charbuf += 5; |
| 5248 | for (i = 0; i < len; i++) |
| 5249 | args[i] = make_number (charbuf[i]); |
| 5250 | components = (method == COMPOSITION_WITH_ALTCHARS |
| 5251 | ? Fstring (len, args) : Fvector (len, args)); |
| 5252 | } |
| 5253 | compose_text (pos, pos + cmp_len, components, Qnil, Qnil); |
| 5254 | } |
| 5255 | |
| 5256 | static int * |
| 5257 | save_composition_data (buf, buf_end, prop) |
| 5258 | int *buf, *buf_end; |
| 5259 | Lisp_Object prop; |
| 5260 | { |
| 5261 | enum composition_method method = COMPOSITION_METHOD (prop); |
| 5262 | int cmp_len = COMPOSITION_LENGTH (prop); |
| 5263 | |
| 5264 | if (buf + 4 + (MAX_COMPOSITION_COMPONENTS * 2 - 1) > buf_end) |
| 5265 | return NULL; |
| 5266 | |
| 5267 | buf[1] = CODING_ANNOTATE_COMPOSITION_MASK; |
| 5268 | buf[2] = method; |
| 5269 | buf[3] = cmp_len; |
| 5270 | |
| 5271 | if (method == COMPOSITION_RELATIVE) |
| 5272 | buf[0] = 4; |
| 5273 | else |
| 5274 | { |
| 5275 | Lisp_Object components; |
| 5276 | int len, i; |
| 5277 | |
| 5278 | components = COMPOSITION_COMPONENTS (prop); |
| 5279 | if (VECTORP (components)) |
| 5280 | { |
| 5281 | len = XVECTOR (components)->size; |
| 5282 | for (i = 0; i < len; i++) |
| 5283 | buf[4 + i] = XINT (AREF (components, i)); |
| 5284 | } |
| 5285 | else if (STRINGP (components)) |
| 5286 | { |
| 5287 | int i_byte; |
| 5288 | |
| 5289 | len = XSTRING (components)->size; |
| 5290 | i = i_byte = 0; |
| 5291 | while (i < len) |
| 5292 | FETCH_STRING_CHAR_ADVANCE (buf[4 + i], components, i, i_byte); |
| 5293 | } |
| 5294 | else if (INTEGERP (components)) |
| 5295 | { |
| 5296 | len = 1; |
| 5297 | buf[4] = XINT (components); |
| 5298 | } |
| 5299 | else if (CONSP (components)) |
| 5300 | { |
| 5301 | for (len = 0; CONSP (components); |
| 5302 | len++, components = XCDR (components)) |
| 5303 | buf[4 + len] = XINT (XCAR (components)); |
| 5304 | } |
| 5305 | else |
| 5306 | abort (); |
| 5307 | buf[0] = 4 + len; |
| 5308 | } |
| 5309 | return (buf + buf[0]); |
| 5310 | } |
| 5311 | |
| 5312 | #define CHARBUF_SIZE 0x4000 |
| 5313 | |
| 5314 | #define ALLOC_CONVERSION_WORK_AREA(coding) \ |
| 5315 | do { \ |
| 5316 | int size = CHARBUF_SIZE;; \ |
| 5317 | \ |
| 5318 | coding->charbuf = NULL; \ |
| 5319 | while (size > 1024) \ |
| 5320 | { \ |
| 5321 | coding->charbuf = (int *) alloca (sizeof (int) * size); \ |
| 5322 | if (coding->charbuf) \ |
| 5323 | break; \ |
| 5324 | size >>= 1; \ |
| 5325 | } \ |
| 5326 | if (! coding->charbuf) \ |
| 5327 | { \ |
| 5328 | coding->result = CODING_RESULT_INSUFFICIENT_MEM; \ |
| 5329 | return coding->result; \ |
| 5330 | } \ |
| 5331 | coding->charbuf_size = size; \ |
| 5332 | } while (0) |
| 5333 | |
| 5334 | |
| 5335 | static void |
| 5336 | produce_annotation (coding) |
| 5337 | struct coding_system *coding; |
| 5338 | { |
| 5339 | int *charbuf = coding->charbuf; |
| 5340 | int *charbuf_end = charbuf + coding->charbuf_used; |
| 5341 | |
| 5342 | while (charbuf < charbuf_end) |
| 5343 | { |
| 5344 | if (*charbuf >= 0) |
| 5345 | charbuf++; |
| 5346 | else |
| 5347 | { |
| 5348 | int len = -*charbuf; |
| 5349 | switch (charbuf[2]) |
| 5350 | { |
| 5351 | case CODING_ANNOTATE_COMPOSITION_MASK: |
| 5352 | produce_composition (coding, charbuf); |
| 5353 | break; |
| 5354 | default: |
| 5355 | abort (); |
| 5356 | } |
| 5357 | charbuf += len; |
| 5358 | } |
| 5359 | } |
| 5360 | } |
| 5361 | |
| 5362 | /* Decode the data at CODING->src_object into CODING->dst_object. |
| 5363 | CODING->src_object is a buffer, a string, or nil. |
| 5364 | CODING->dst_object is a buffer. |
| 5365 | |
| 5366 | If CODING->src_object is a buffer, it must be the current buffer. |
| 5367 | In this case, if CODING->src_pos is positive, it is a position of |
| 5368 | the source text in the buffer, otherwise, the source text is in the |
| 5369 | gap area of the buffer, and CODING->src_pos specifies the offset of |
| 5370 | the text from GPT (which must be the same as PT). If this is the |
| 5371 | same buffer as CODING->dst_object, CODING->src_pos must be |
| 5372 | negative. |
| 5373 | |
| 5374 | If CODING->src_object is a string, CODING->src_pos in an index to |
| 5375 | that string. |
| 5376 | |
| 5377 | If CODING->src_object is nil, CODING->source must already point to |
| 5378 | the non-relocatable memory area. In this case, CODING->src_pos is |
| 5379 | an offset from CODING->source. |
| 5380 | |
| 5381 | The decoded data is inserted at the current point of the buffer |
| 5382 | CODING->dst_object. |
| 5383 | */ |
| 5384 | |
| 5385 | static int |
| 5386 | decode_coding (coding) |
| 5387 | struct coding_system *coding; |
| 5388 | { |
| 5389 | Lisp_Object attrs; |
| 5390 | |
| 5391 | if (BUFFERP (coding->src_object) |
| 5392 | && coding->src_pos > 0 |
| 5393 | && coding->src_pos < GPT |
| 5394 | && coding->src_pos + coding->src_chars > GPT) |
| 5395 | move_gap_both (coding->src_pos, coding->src_pos_byte); |
| 5396 | |
| 5397 | if (BUFFERP (coding->dst_object)) |
| 5398 | { |
| 5399 | if (current_buffer != XBUFFER (coding->dst_object)) |
| 5400 | set_buffer_internal (XBUFFER (coding->dst_object)); |
| 5401 | if (GPT != PT) |
| 5402 | move_gap_both (PT, PT_BYTE); |
| 5403 | } |
| 5404 | |
| 5405 | coding->consumed = coding->consumed_char = 0; |
| 5406 | coding->produced = coding->produced_char = 0; |
| 5407 | coding->chars_at_source = 0; |
| 5408 | coding->result = CODING_RESULT_SUCCESS; |
| 5409 | coding->errors = 0; |
| 5410 | |
| 5411 | ALLOC_CONVERSION_WORK_AREA (coding); |
| 5412 | |
| 5413 | attrs = CODING_ID_ATTRS (coding->id); |
| 5414 | |
| 5415 | do |
| 5416 | { |
| 5417 | coding_set_source (coding); |
| 5418 | coding->annotated = 0; |
| 5419 | (*(coding->decoder)) (coding); |
| 5420 | if (!NILP (CODING_ATTR_DECODE_TBL (attrs))) |
| 5421 | translate_chars (CODING_ATTR_DECODE_TBL (attrs), coding); |
| 5422 | coding_set_destination (coding); |
| 5423 | produce_chars (coding); |
| 5424 | if (coding->annotated) |
| 5425 | produce_annotation (coding); |
| 5426 | } |
| 5427 | while (coding->consumed < coding->src_bytes |
| 5428 | && ! coding->result); |
| 5429 | |
| 5430 | if (EQ (CODING_ATTR_TYPE (CODING_ID_ATTRS (coding->id)), Qccl) |
| 5431 | && SYMBOLP (CODING_ID_EOL_TYPE (coding->id)) |
| 5432 | && ! EQ (CODING_ID_EOL_TYPE (coding->id), Qunix)) |
| 5433 | decode_eol (coding); |
| 5434 | |
| 5435 | coding->carryover_bytes = 0; |
| 5436 | if (coding->consumed < coding->src_bytes) |
| 5437 | { |
| 5438 | int nbytes = coding->src_bytes - coding->consumed; |
| 5439 | unsigned char *src; |
| 5440 | |
| 5441 | coding_set_source (coding); |
| 5442 | coding_set_destination (coding); |
| 5443 | src = coding->source + coding->consumed; |
| 5444 | |
| 5445 | if (coding->mode & CODING_MODE_LAST_BLOCK) |
| 5446 | { |
| 5447 | /* Flush out unprocessed data as binary chars. We are sure |
| 5448 | that the number of data is less than the size of |
| 5449 | coding->charbuf. */ |
| 5450 | int *charbuf = coding->charbuf; |
| 5451 | |
| 5452 | while (nbytes-- > 0) |
| 5453 | { |
| 5454 | int c = *src++; |
| 5455 | *charbuf++ = (c & 0x80 ? - c : c); |
| 5456 | } |
| 5457 | produce_chars (coding); |
| 5458 | } |
| 5459 | else |
| 5460 | { |
| 5461 | /* Record unprocessed bytes in coding->carryover. We are |
| 5462 | sure that the number of data is less than the size of |
| 5463 | coding->carryover. */ |
| 5464 | unsigned char *p = coding->carryover; |
| 5465 | |
| 5466 | coding->carryover_bytes = nbytes; |
| 5467 | while (nbytes-- > 0) |
| 5468 | *p++ = *src++; |
| 5469 | } |
| 5470 | coding->consumed = coding->src_bytes; |
| 5471 | } |
| 5472 | |
| 5473 | return coding->result; |
| 5474 | } |
| 5475 | |
| 5476 | static void |
| 5477 | consume_chars (coding) |
| 5478 | struct coding_system *coding; |
| 5479 | { |
| 5480 | int *buf = coding->charbuf; |
| 5481 | /* -1 is to compensate for CRLF. */ |
| 5482 | int *buf_end = coding->charbuf + coding->charbuf_size - 1; |
| 5483 | unsigned char *src = coding->source + coding->consumed; |
| 5484 | int pos = coding->src_pos + coding->consumed_char; |
| 5485 | int end_pos = coding->src_pos + coding->src_chars; |
| 5486 | int multibytep = coding->src_multibyte; |
| 5487 | Lisp_Object eol_type; |
| 5488 | int c; |
| 5489 | int start, end, stop; |
| 5490 | Lisp_Object object, prop; |
| 5491 | |
| 5492 | eol_type = CODING_ID_EOL_TYPE (coding->id); |
| 5493 | if (VECTORP (eol_type)) |
| 5494 | eol_type = Qunix; |
| 5495 | |
| 5496 | object = coding->src_object; |
| 5497 | |
| 5498 | /* Note: composition handling is not yet implemented. */ |
| 5499 | coding->common_flags &= ~CODING_ANNOTATE_COMPOSITION_MASK; |
| 5500 | |
| 5501 | if (coding->common_flags & CODING_ANNOTATE_COMPOSITION_MASK |
| 5502 | && find_composition (pos, end_pos, &start, &end, &prop, object) |
| 5503 | && end <= end_pos |
| 5504 | && (start >= pos |
| 5505 | || (find_composition (end, end_pos, &start, &end, &prop, object) |
| 5506 | && end <= end_pos))) |
| 5507 | stop = start; |
| 5508 | else |
| 5509 | stop = end_pos; |
| 5510 | |
| 5511 | while (buf < buf_end) |
| 5512 | { |
| 5513 | if (pos == stop) |
| 5514 | { |
| 5515 | int *p; |
| 5516 | |
| 5517 | if (pos == end_pos) |
| 5518 | break; |
| 5519 | p = save_composition_data (buf, buf_end, prop); |
| 5520 | if (p == NULL) |
| 5521 | break; |
| 5522 | buf = p; |
| 5523 | if (find_composition (end, end_pos, &start, &end, &prop, object) |
| 5524 | && end <= end_pos) |
| 5525 | stop = start; |
| 5526 | else |
| 5527 | stop = end_pos; |
| 5528 | } |
| 5529 | |
| 5530 | if (! multibytep) |
| 5531 | c = *src++; |
| 5532 | else |
| 5533 | c = STRING_CHAR_ADVANCE (src); |
| 5534 | if ((c == '\r') && (coding->mode & CODING_MODE_SELECTIVE_DISPLAY)) |
| 5535 | c = '\n'; |
| 5536 | if (! EQ (eol_type, Qunix)) |
| 5537 | { |
| 5538 | if (c == '\n') |
| 5539 | { |
| 5540 | if (EQ (eol_type, Qdos)) |
| 5541 | *buf++ = '\r'; |
| 5542 | else |
| 5543 | c = '\r'; |
| 5544 | } |
| 5545 | } |
| 5546 | *buf++ = c; |
| 5547 | pos++; |
| 5548 | } |
| 5549 | |
| 5550 | coding->consumed = src - coding->source; |
| 5551 | coding->consumed_char = pos - coding->src_pos; |
| 5552 | coding->charbuf_used = buf - coding->charbuf; |
| 5553 | coding->chars_at_source = 0; |
| 5554 | } |
| 5555 | |
| 5556 | |
| 5557 | /* Encode the text at CODING->src_object into CODING->dst_object. |
| 5558 | CODING->src_object is a buffer or a string. |
| 5559 | CODING->dst_object is a buffer or nil. |
| 5560 | |
| 5561 | If CODING->src_object is a buffer, it must be the current buffer. |
| 5562 | In this case, if CODING->src_pos is positive, it is a position of |
| 5563 | the source text in the buffer, otherwise. the source text is in the |
| 5564 | gap area of the buffer, and coding->src_pos specifies the offset of |
| 5565 | the text from GPT (which must be the same as PT). If this is the |
| 5566 | same buffer as CODING->dst_object, CODING->src_pos must be |
| 5567 | negative and CODING should not have `pre-write-conversion'. |
| 5568 | |
| 5569 | If CODING->src_object is a string, CODING should not have |
| 5570 | `pre-write-conversion'. |
| 5571 | |
| 5572 | If CODING->dst_object is a buffer, the encoded data is inserted at |
| 5573 | the current point of that buffer. |
| 5574 | |
| 5575 | If CODING->dst_object is nil, the encoded data is placed at the |
| 5576 | memory area specified by CODING->destination. */ |
| 5577 | |
| 5578 | static int |
| 5579 | encode_coding (coding) |
| 5580 | struct coding_system *coding; |
| 5581 | { |
| 5582 | Lisp_Object attrs; |
| 5583 | |
| 5584 | attrs = CODING_ID_ATTRS (coding->id); |
| 5585 | |
| 5586 | if (BUFFERP (coding->dst_object)) |
| 5587 | { |
| 5588 | set_buffer_internal (XBUFFER (coding->dst_object)); |
| 5589 | coding->dst_multibyte |
| 5590 | = ! NILP (current_buffer->enable_multibyte_characters); |
| 5591 | } |
| 5592 | |
| 5593 | coding->consumed = coding->consumed_char = 0; |
| 5594 | coding->produced = coding->produced_char = 0; |
| 5595 | coding->result = CODING_RESULT_SUCCESS; |
| 5596 | coding->errors = 0; |
| 5597 | |
| 5598 | ALLOC_CONVERSION_WORK_AREA (coding); |
| 5599 | |
| 5600 | do { |
| 5601 | coding_set_source (coding); |
| 5602 | consume_chars (coding); |
| 5603 | |
| 5604 | if (!NILP (CODING_ATTR_ENCODE_TBL (attrs))) |
| 5605 | translate_chars (CODING_ATTR_ENCODE_TBL (attrs), coding); |
| 5606 | |
| 5607 | coding_set_destination (coding); |
| 5608 | (*(coding->encoder)) (coding); |
| 5609 | } while (coding->consumed_char < coding->src_chars); |
| 5610 | |
| 5611 | if (BUFFERP (coding->dst_object)) |
| 5612 | insert_from_gap (coding->produced_char, coding->produced); |
| 5613 | |
| 5614 | return (coding->result); |
| 5615 | } |
| 5616 | |
| 5617 | /* Work buffer */ |
| 5618 | |
| 5619 | /* List of currently used working buffer. */ |
| 5620 | Lisp_Object Vcode_conversion_work_buf_list; |
| 5621 | |
| 5622 | /* A working buffer used by the top level conversion. */ |
| 5623 | Lisp_Object Vcode_conversion_reused_work_buf; |
| 5624 | |
| 5625 | |
| 5626 | /* Return a working buffer that can be freely used by the following |
| 5627 | code conversion. MULTIBYTEP specifies the multibyteness of the |
| 5628 | buffer. */ |
| 5629 | |
| 5630 | Lisp_Object |
| 5631 | make_conversion_work_buffer (multibytep) |
| 5632 | int multibytep; |
| 5633 | { |
| 5634 | struct buffer *current = current_buffer; |
| 5635 | Lisp_Object buf; |
| 5636 | |
| 5637 | if (NILP (Vcode_conversion_work_buf_list)) |
| 5638 | { |
| 5639 | if (NILP (Vcode_conversion_reused_work_buf)) |
| 5640 | Vcode_conversion_reused_work_buf |
| 5641 | = Fget_buffer_create (build_string (" *code-conversion-work*")); |
| 5642 | Vcode_conversion_work_buf_list |
| 5643 | = Fcons (Vcode_conversion_reused_work_buf, Qnil); |
| 5644 | } |
| 5645 | else |
| 5646 | { |
| 5647 | int depth = Flength (Vcode_conversion_work_buf_list); |
| 5648 | char str[128]; |
| 5649 | |
| 5650 | sprintf (str, " *code-conversion-work*<%d>", depth); |
| 5651 | Vcode_conversion_work_buf_list |
| 5652 | = Fcons (Fget_buffer_create (build_string (str)), |
| 5653 | Vcode_conversion_work_buf_list); |
| 5654 | } |
| 5655 | |
| 5656 | buf = XCAR (Vcode_conversion_work_buf_list); |
| 5657 | set_buffer_internal (XBUFFER (buf)); |
| 5658 | current_buffer->undo_list = Qt; |
| 5659 | Ferase_buffer (); |
| 5660 | Fset_buffer_multibyte (multibytep ? Qt : Qnil); |
| 5661 | set_buffer_internal (current); |
| 5662 | return buf; |
| 5663 | } |
| 5664 | |
| 5665 | static struct coding_system *saved_coding; |
| 5666 | |
| 5667 | Lisp_Object |
| 5668 | code_conversion_restore (info) |
| 5669 | Lisp_Object info; |
| 5670 | { |
| 5671 | int depth = Flength (Vcode_conversion_work_buf_list); |
| 5672 | Lisp_Object buf; |
| 5673 | |
| 5674 | if (depth > 0) |
| 5675 | { |
| 5676 | buf = XCAR (Vcode_conversion_work_buf_list); |
| 5677 | Vcode_conversion_work_buf_list = XCDR (Vcode_conversion_work_buf_list); |
| 5678 | if (depth > 1 && !NILP (Fbuffer_live_p (buf))) |
| 5679 | Fkill_buffer (buf); |
| 5680 | } |
| 5681 | |
| 5682 | if (saved_coding->dst_object == Qt |
| 5683 | && saved_coding->destination) |
| 5684 | xfree (saved_coding->destination); |
| 5685 | |
| 5686 | return save_excursion_restore (info); |
| 5687 | } |
| 5688 | |
| 5689 | |
| 5690 | int |
| 5691 | decode_coding_gap (coding, chars, bytes) |
| 5692 | struct coding_system *coding; |
| 5693 | EMACS_INT chars, bytes; |
| 5694 | { |
| 5695 | int count = specpdl_ptr - specpdl; |
| 5696 | |
| 5697 | saved_coding = coding; |
| 5698 | record_unwind_protect (code_conversion_restore, save_excursion_save ()); |
| 5699 | |
| 5700 | coding->src_object = Fcurrent_buffer (); |
| 5701 | coding->src_chars = chars; |
| 5702 | coding->src_bytes = bytes; |
| 5703 | coding->src_pos = -chars; |
| 5704 | coding->src_pos_byte = -bytes; |
| 5705 | coding->src_multibyte = chars < bytes; |
| 5706 | coding->dst_object = coding->src_object; |
| 5707 | coding->dst_pos = PT; |
| 5708 | coding->dst_pos_byte = PT_BYTE; |
| 5709 | |
| 5710 | if (CODING_REQUIRE_DETECTION (coding)) |
| 5711 | detect_coding (coding); |
| 5712 | |
| 5713 | decode_coding (coding); |
| 5714 | |
| 5715 | unbind_to (count, Qnil); |
| 5716 | return coding->result; |
| 5717 | } |
| 5718 | |
| 5719 | int |
| 5720 | encode_coding_gap (coding, chars, bytes) |
| 5721 | struct coding_system *coding; |
| 5722 | EMACS_INT chars, bytes; |
| 5723 | { |
| 5724 | int count = specpdl_ptr - specpdl; |
| 5725 | Lisp_Object buffer; |
| 5726 | |
| 5727 | saved_coding = coding; |
| 5728 | record_unwind_protect (code_conversion_restore, save_excursion_save ()); |
| 5729 | |
| 5730 | buffer = Fcurrent_buffer (); |
| 5731 | coding->src_object = buffer; |
| 5732 | coding->src_chars = chars; |
| 5733 | coding->src_bytes = bytes; |
| 5734 | coding->src_pos = -chars; |
| 5735 | coding->src_pos_byte = -bytes; |
| 5736 | coding->src_multibyte = chars < bytes; |
| 5737 | coding->dst_object = coding->src_object; |
| 5738 | coding->dst_pos = PT; |
| 5739 | coding->dst_pos_byte = PT_BYTE; |
| 5740 | |
| 5741 | encode_coding (coding); |
| 5742 | |
| 5743 | unbind_to (count, Qnil); |
| 5744 | return coding->result; |
| 5745 | } |
| 5746 | |
| 5747 | |
| 5748 | /* Decode the text in the range FROM/FROM_BYTE and TO/TO_BYTE in |
| 5749 | SRC_OBJECT into DST_OBJECT by coding context CODING. |
| 5750 | |
| 5751 | SRC_OBJECT is a buffer, a string, or Qnil. |
| 5752 | |
| 5753 | If it is a buffer, the text is at point of the buffer. FROM and TO |
| 5754 | are positions in the buffer. |
| 5755 | |
| 5756 | If it is a string, the text is at the beginning of the string. |
| 5757 | FROM and TO are indices to the string. |
| 5758 | |
| 5759 | If it is nil, the text is at coding->source. FROM and TO are |
| 5760 | indices to coding->source. |
| 5761 | |
| 5762 | DST_OBJECT is a buffer, Qt, or Qnil. |
| 5763 | |
| 5764 | If it is a buffer, the decoded text is inserted at point of the |
| 5765 | buffer. If the buffer is the same as SRC_OBJECT, the source text |
| 5766 | is deleted. |
| 5767 | |
| 5768 | If it is Qt, a string is made from the decoded text, and |
| 5769 | set in CODING->dst_object. |
| 5770 | |
| 5771 | If it is Qnil, the decoded text is stored at CODING->destination. |
| 5772 | The called must allocate CODING->dst_bytes bytes at |
| 5773 | CODING->destination by xmalloc. If the decoded text is longer than |
| 5774 | CODING->dst_bytes, CODING->destination is relocated by xrealloc. |
| 5775 | */ |
| 5776 | |
| 5777 | void |
| 5778 | decode_coding_object (coding, src_object, from, from_byte, to, to_byte, |
| 5779 | dst_object) |
| 5780 | struct coding_system *coding; |
| 5781 | Lisp_Object src_object; |
| 5782 | EMACS_INT from, from_byte, to, to_byte; |
| 5783 | Lisp_Object dst_object; |
| 5784 | { |
| 5785 | int count = specpdl_ptr - specpdl; |
| 5786 | unsigned char *destination; |
| 5787 | EMACS_INT dst_bytes; |
| 5788 | EMACS_INT chars = to - from; |
| 5789 | EMACS_INT bytes = to_byte - from_byte; |
| 5790 | Lisp_Object attrs; |
| 5791 | |
| 5792 | saved_coding = coding; |
| 5793 | record_unwind_protect (code_conversion_restore, save_excursion_save ()); |
| 5794 | |
| 5795 | if (NILP (dst_object)) |
| 5796 | { |
| 5797 | destination = coding->destination; |
| 5798 | dst_bytes = coding->dst_bytes; |
| 5799 | } |
| 5800 | |
| 5801 | coding->src_object = src_object; |
| 5802 | coding->src_chars = chars; |
| 5803 | coding->src_bytes = bytes; |
| 5804 | coding->src_multibyte = chars < bytes; |
| 5805 | |
| 5806 | if (STRINGP (src_object)) |
| 5807 | { |
| 5808 | coding->src_pos = from; |
| 5809 | coding->src_pos_byte = from_byte; |
| 5810 | } |
| 5811 | else if (BUFFERP (src_object)) |
| 5812 | { |
| 5813 | set_buffer_internal (XBUFFER (src_object)); |
| 5814 | if (from != GPT) |
| 5815 | move_gap_both (from, from_byte); |
| 5816 | if (EQ (src_object, dst_object)) |
| 5817 | { |
| 5818 | TEMP_SET_PT_BOTH (from, from_byte); |
| 5819 | del_range_both (from, from_byte, to, to_byte, 1); |
| 5820 | coding->src_pos = -chars; |
| 5821 | coding->src_pos_byte = -bytes; |
| 5822 | } |
| 5823 | else |
| 5824 | { |
| 5825 | coding->src_pos = from; |
| 5826 | coding->src_pos_byte = from_byte; |
| 5827 | } |
| 5828 | } |
| 5829 | |
| 5830 | if (CODING_REQUIRE_DETECTION (coding)) |
| 5831 | detect_coding (coding); |
| 5832 | attrs = CODING_ID_ATTRS (coding->id); |
| 5833 | |
| 5834 | if (! NILP (CODING_ATTR_POST_READ (attrs)) |
| 5835 | || EQ (dst_object, Qt)) |
| 5836 | { |
| 5837 | coding->dst_object = make_conversion_work_buffer (1); |
| 5838 | coding->dst_pos = BEG; |
| 5839 | coding->dst_pos_byte = BEG_BYTE; |
| 5840 | coding->dst_multibyte = 1; |
| 5841 | } |
| 5842 | else if (BUFFERP (dst_object)) |
| 5843 | { |
| 5844 | coding->dst_object = dst_object; |
| 5845 | coding->dst_pos = BUF_PT (XBUFFER (dst_object)); |
| 5846 | coding->dst_pos_byte = BUF_PT_BYTE (XBUFFER (dst_object)); |
| 5847 | coding->dst_multibyte |
| 5848 | = ! NILP (XBUFFER (dst_object)->enable_multibyte_characters); |
| 5849 | } |
| 5850 | else |
| 5851 | { |
| 5852 | coding->dst_object = Qnil; |
| 5853 | coding->dst_multibyte = 1; |
| 5854 | } |
| 5855 | |
| 5856 | decode_coding (coding); |
| 5857 | |
| 5858 | if (BUFFERP (coding->dst_object)) |
| 5859 | set_buffer_internal (XBUFFER (coding->dst_object)); |
| 5860 | |
| 5861 | if (! NILP (CODING_ATTR_POST_READ (attrs))) |
| 5862 | { |
| 5863 | struct gcpro gcpro1, gcpro2; |
| 5864 | EMACS_INT prev_Z = Z, prev_Z_BYTE = Z_BYTE; |
| 5865 | Lisp_Object val; |
| 5866 | |
| 5867 | GCPRO2 (coding->src_object, coding->dst_object); |
| 5868 | val = call1 (CODING_ATTR_POST_READ (attrs), |
| 5869 | make_number (coding->produced_char)); |
| 5870 | UNGCPRO; |
| 5871 | CHECK_NATNUM (val); |
| 5872 | coding->produced_char += Z - prev_Z; |
| 5873 | coding->produced += Z_BYTE - prev_Z_BYTE; |
| 5874 | } |
| 5875 | |
| 5876 | if (EQ (dst_object, Qt)) |
| 5877 | { |
| 5878 | coding->dst_object = Fbuffer_string (); |
| 5879 | } |
| 5880 | else if (NILP (dst_object) && BUFFERP (coding->dst_object)) |
| 5881 | { |
| 5882 | set_buffer_internal (XBUFFER (coding->dst_object)); |
| 5883 | if (dst_bytes < coding->produced) |
| 5884 | { |
| 5885 | destination |
| 5886 | = (unsigned char *) xrealloc (destination, coding->produced); |
| 5887 | if (! destination) |
| 5888 | { |
| 5889 | coding->result = CODING_RESULT_INSUFFICIENT_DST; |
| 5890 | unbind_to (count, Qnil); |
| 5891 | return; |
| 5892 | } |
| 5893 | if (BEGV < GPT && GPT < BEGV + coding->produced_char) |
| 5894 | move_gap_both (BEGV, BEGV_BYTE); |
| 5895 | bcopy (BEGV_ADDR, destination, coding->produced); |
| 5896 | coding->destination = destination; |
| 5897 | } |
| 5898 | } |
| 5899 | |
| 5900 | unbind_to (count, Qnil); |
| 5901 | } |
| 5902 | |
| 5903 | |
| 5904 | void |
| 5905 | encode_coding_object (coding, src_object, from, from_byte, to, to_byte, |
| 5906 | dst_object) |
| 5907 | struct coding_system *coding; |
| 5908 | Lisp_Object src_object; |
| 5909 | EMACS_INT from, from_byte, to, to_byte; |
| 5910 | Lisp_Object dst_object; |
| 5911 | { |
| 5912 | int count = specpdl_ptr - specpdl; |
| 5913 | EMACS_INT chars = to - from; |
| 5914 | EMACS_INT bytes = to_byte - from_byte; |
| 5915 | Lisp_Object attrs; |
| 5916 | |
| 5917 | saved_coding = coding; |
| 5918 | record_unwind_protect (code_conversion_restore, save_excursion_save ()); |
| 5919 | |
| 5920 | coding->src_object = src_object; |
| 5921 | coding->src_chars = chars; |
| 5922 | coding->src_bytes = bytes; |
| 5923 | coding->src_multibyte = chars < bytes; |
| 5924 | |
| 5925 | attrs = CODING_ID_ATTRS (coding->id); |
| 5926 | |
| 5927 | if (! NILP (CODING_ATTR_PRE_WRITE (attrs))) |
| 5928 | { |
| 5929 | Lisp_Object val; |
| 5930 | |
| 5931 | coding->src_object = make_conversion_work_buffer (coding->src_multibyte); |
| 5932 | set_buffer_internal (XBUFFER (coding->src_object)); |
| 5933 | if (STRINGP (src_object)) |
| 5934 | insert_from_string (src_object, from, from_byte, chars, bytes, 0); |
| 5935 | else if (BUFFERP (src_object)) |
| 5936 | insert_from_buffer (XBUFFER (src_object), from, chars, 0); |
| 5937 | else |
| 5938 | insert_1_both (coding->source + from, chars, bytes, 0, 0, 0); |
| 5939 | |
| 5940 | if (EQ (src_object, dst_object)) |
| 5941 | { |
| 5942 | set_buffer_internal (XBUFFER (src_object)); |
| 5943 | del_range_both (from, from_byte, to, to_byte, 1); |
| 5944 | set_buffer_internal (XBUFFER (coding->src_object)); |
| 5945 | } |
| 5946 | |
| 5947 | val = call2 (CODING_ATTR_PRE_WRITE (attrs), |
| 5948 | make_number (1), make_number (chars)); |
| 5949 | CHECK_NATNUM (val); |
| 5950 | if (BEG != GPT) |
| 5951 | move_gap_both (BEG, BEG_BYTE); |
| 5952 | coding->src_chars = Z - BEG; |
| 5953 | coding->src_bytes = Z_BYTE - BEG_BYTE; |
| 5954 | coding->src_pos = BEG; |
| 5955 | coding->src_pos_byte = BEG_BYTE; |
| 5956 | coding->src_multibyte = Z < Z_BYTE; |
| 5957 | } |
| 5958 | else if (STRINGP (src_object)) |
| 5959 | { |
| 5960 | coding->src_pos = from; |
| 5961 | coding->src_pos_byte = from_byte; |
| 5962 | } |
| 5963 | else if (BUFFERP (src_object)) |
| 5964 | { |
| 5965 | set_buffer_internal (XBUFFER (src_object)); |
| 5966 | if (from != GPT) |
| 5967 | move_gap_both (from, from_byte); |
| 5968 | if (EQ (src_object, dst_object)) |
| 5969 | { |
| 5970 | del_range_both (from, from_byte, to, to_byte, 1); |
| 5971 | coding->src_pos = -chars; |
| 5972 | coding->src_pos_byte = -bytes; |
| 5973 | } |
| 5974 | else |
| 5975 | { |
| 5976 | coding->src_pos = from; |
| 5977 | coding->src_pos_byte = from_byte; |
| 5978 | } |
| 5979 | } |
| 5980 | |
| 5981 | if (BUFFERP (dst_object)) |
| 5982 | { |
| 5983 | coding->dst_object = dst_object; |
| 5984 | coding->dst_pos = BUF_PT (XBUFFER (dst_object)); |
| 5985 | coding->dst_pos_byte = BUF_PT_BYTE (XBUFFER (dst_object)); |
| 5986 | coding->dst_multibyte |
| 5987 | = ! NILP (XBUFFER (dst_object)->enable_multibyte_characters); |
| 5988 | } |
| 5989 | else if (EQ (dst_object, Qt)) |
| 5990 | { |
| 5991 | coding->dst_object = Qnil; |
| 5992 | coding->destination = (unsigned char *) xmalloc (coding->src_chars); |
| 5993 | coding->dst_bytes = coding->src_chars; |
| 5994 | coding->dst_multibyte = 0; |
| 5995 | } |
| 5996 | else |
| 5997 | { |
| 5998 | coding->dst_object = Qnil; |
| 5999 | coding->dst_multibyte = 0; |
| 6000 | } |
| 6001 | |
| 6002 | encode_coding (coding); |
| 6003 | |
| 6004 | if (EQ (dst_object, Qt)) |
| 6005 | { |
| 6006 | if (BUFFERP (coding->dst_object)) |
| 6007 | coding->dst_object = Fbuffer_string (); |
| 6008 | else |
| 6009 | { |
| 6010 | coding->dst_object |
| 6011 | = make_unibyte_string ((char *) coding->destination, |
| 6012 | coding->produced); |
| 6013 | xfree (coding->destination); |
| 6014 | } |
| 6015 | } |
| 6016 | |
| 6017 | unbind_to (count, Qnil); |
| 6018 | } |
| 6019 | |
| 6020 | |
| 6021 | Lisp_Object |
| 6022 | preferred_coding_system () |
| 6023 | { |
| 6024 | int id = coding_categories[coding_priorities[0]].id; |
| 6025 | |
| 6026 | return CODING_ID_NAME (id); |
| 6027 | } |
| 6028 | |
| 6029 | \f |
| 6030 | #ifdef emacs |
| 6031 | /*** 8. Emacs Lisp library functions ***/ |
| 6032 | |
| 6033 | DEFUN ("coding-system-p", Fcoding_system_p, Scoding_system_p, 1, 1, 0, |
| 6034 | doc: /* Return t if OBJECT is nil or a coding-system. |
| 6035 | See the documentation of `define-coding-system' for information |
| 6036 | about coding-system objects. */) |
| 6037 | (obj) |
| 6038 | Lisp_Object obj; |
| 6039 | { |
| 6040 | return ((NILP (obj) || CODING_SYSTEM_P (obj)) ? Qt : Qnil); |
| 6041 | } |
| 6042 | |
| 6043 | DEFUN ("read-non-nil-coding-system", Fread_non_nil_coding_system, |
| 6044 | Sread_non_nil_coding_system, 1, 1, 0, |
| 6045 | doc: /* Read a coding system from the minibuffer, prompting with string PROMPT. */) |
| 6046 | (prompt) |
| 6047 | Lisp_Object prompt; |
| 6048 | { |
| 6049 | Lisp_Object val; |
| 6050 | do |
| 6051 | { |
| 6052 | val = Fcompleting_read (prompt, Vcoding_system_alist, Qnil, |
| 6053 | Qt, Qnil, Qcoding_system_history, Qnil, Qnil); |
| 6054 | } |
| 6055 | while (XSTRING (val)->size == 0); |
| 6056 | return (Fintern (val, Qnil)); |
| 6057 | } |
| 6058 | |
| 6059 | DEFUN ("read-coding-system", Fread_coding_system, Sread_coding_system, 1, 2, 0, |
| 6060 | doc: /* Read a coding system from the minibuffer, prompting with string PROMPT. |
| 6061 | If the user enters null input, return second argument DEFAULT-CODING-SYSTEM. */) |
| 6062 | (prompt, default_coding_system) |
| 6063 | Lisp_Object prompt, default_coding_system; |
| 6064 | { |
| 6065 | Lisp_Object val; |
| 6066 | if (SYMBOLP (default_coding_system)) |
| 6067 | XSETSTRING (default_coding_system, XSYMBOL (default_coding_system)->name); |
| 6068 | val = Fcompleting_read (prompt, Vcoding_system_alist, Qnil, |
| 6069 | Qt, Qnil, Qcoding_system_history, |
| 6070 | default_coding_system, Qnil); |
| 6071 | return (XSTRING (val)->size == 0 ? Qnil : Fintern (val, Qnil)); |
| 6072 | } |
| 6073 | |
| 6074 | DEFUN ("check-coding-system", Fcheck_coding_system, Scheck_coding_system, |
| 6075 | 1, 1, 0, |
| 6076 | doc: /* Check validity of CODING-SYSTEM. |
| 6077 | If valid, return CODING-SYSTEM, else signal a `coding-system-error' error. |
| 6078 | It is valid if it is a symbol with a non-nil `coding-system' property. |
| 6079 | The value of property should be a vector of length 5. */) |
| 6080 | (coding_system) |
| 6081 | Lisp_Object coding_system; |
| 6082 | { |
| 6083 | CHECK_SYMBOL (coding_system); |
| 6084 | if (!NILP (Fcoding_system_p (coding_system))) |
| 6085 | return coding_system; |
| 6086 | while (1) |
| 6087 | Fsignal (Qcoding_system_error, Fcons (coding_system, Qnil)); |
| 6088 | } |
| 6089 | |
| 6090 | \f |
| 6091 | Lisp_Object |
| 6092 | detect_coding_system (src, src_bytes, highest, multibytep, coding_system) |
| 6093 | unsigned char *src; |
| 6094 | int src_bytes, highest; |
| 6095 | int multibytep; |
| 6096 | Lisp_Object coding_system; |
| 6097 | { |
| 6098 | unsigned char *src_end = src + src_bytes; |
| 6099 | int mask = CATEGORY_MASK_ANY; |
| 6100 | int detected = 0; |
| 6101 | int c, i; |
| 6102 | Lisp_Object attrs, eol_type; |
| 6103 | Lisp_Object val; |
| 6104 | struct coding_system coding; |
| 6105 | |
| 6106 | if (NILP (coding_system)) |
| 6107 | coding_system = Qundecided; |
| 6108 | setup_coding_system (coding_system, &coding); |
| 6109 | attrs = CODING_ID_ATTRS (coding.id); |
| 6110 | eol_type = CODING_ID_EOL_TYPE (coding.id); |
| 6111 | |
| 6112 | coding.source = src; |
| 6113 | coding.src_bytes = src_bytes; |
| 6114 | coding.src_multibyte = multibytep; |
| 6115 | coding.consumed = 0; |
| 6116 | |
| 6117 | if (XINT (CODING_ATTR_CATEGORY (attrs)) != coding_category_undecided) |
| 6118 | { |
| 6119 | mask = 1 << XINT (CODING_ATTR_CATEGORY (attrs)); |
| 6120 | } |
| 6121 | else |
| 6122 | { |
| 6123 | coding_system = Qnil; |
| 6124 | for (; src < src_end; src++) |
| 6125 | { |
| 6126 | c = *src; |
| 6127 | if (c & 0x80 || (c < 0x20 && (c == ISO_CODE_ESC |
| 6128 | || c == ISO_CODE_SI |
| 6129 | || c == ISO_CODE_SO))) |
| 6130 | break; |
| 6131 | } |
| 6132 | coding.head_ascii = src - coding.source; |
| 6133 | |
| 6134 | if (src < src_end) |
| 6135 | for (i = 0; i < coding_category_raw_text; i++) |
| 6136 | { |
| 6137 | enum coding_category category = coding_priorities[i]; |
| 6138 | struct coding_system *this = coding_categories + category; |
| 6139 | |
| 6140 | if (category >= coding_category_raw_text |
| 6141 | || detected & (1 << category)) |
| 6142 | continue; |
| 6143 | |
| 6144 | if (this->id < 0) |
| 6145 | { |
| 6146 | /* No coding system of this category is defined. */ |
| 6147 | mask &= ~(1 << category); |
| 6148 | } |
| 6149 | else |
| 6150 | { |
| 6151 | detected |= detected_mask[category]; |
| 6152 | if ((*(coding_categories[category].detector)) (&coding, &mask) |
| 6153 | && highest) |
| 6154 | { |
| 6155 | mask &= detected_mask[category]; |
| 6156 | break; |
| 6157 | } |
| 6158 | } |
| 6159 | } |
| 6160 | } |
| 6161 | |
| 6162 | if (!mask) |
| 6163 | val = Fcons (make_number (coding_category_raw_text), Qnil); |
| 6164 | else if (mask == CATEGORY_MASK_ANY) |
| 6165 | val = Fcons (make_number (coding_category_undecided), Qnil); |
| 6166 | else if (highest) |
| 6167 | { |
| 6168 | for (i = 0; i < coding_category_raw_text; i++) |
| 6169 | if (mask & (1 << coding_priorities[i])) |
| 6170 | { |
| 6171 | val = Fcons (make_number (coding_priorities[i]), Qnil); |
| 6172 | break; |
| 6173 | } |
| 6174 | } |
| 6175 | else |
| 6176 | { |
| 6177 | val = Qnil; |
| 6178 | for (i = coding_category_raw_text - 1; i >= 0; i--) |
| 6179 | if (mask & (1 << coding_priorities[i])) |
| 6180 | val = Fcons (make_number (coding_priorities[i]), val); |
| 6181 | } |
| 6182 | |
| 6183 | { |
| 6184 | int one_byte_eol = -1, two_byte_eol = -1; |
| 6185 | Lisp_Object tail; |
| 6186 | |
| 6187 | for (tail = val; CONSP (tail); tail = XCDR (tail)) |
| 6188 | { |
| 6189 | struct coding_system *this |
| 6190 | = (NILP (coding_system) ? coding_categories + XINT (XCAR (tail)) |
| 6191 | : &coding); |
| 6192 | int this_eol; |
| 6193 | |
| 6194 | attrs = CODING_ID_ATTRS (this->id); |
| 6195 | eol_type = CODING_ID_EOL_TYPE (this->id); |
| 6196 | XSETCAR (tail, CODING_ID_NAME (this->id)); |
| 6197 | if (VECTORP (eol_type)) |
| 6198 | { |
| 6199 | if (EQ (CODING_ATTR_TYPE (attrs), Qutf_16)) |
| 6200 | { |
| 6201 | if (two_byte_eol < 0) |
| 6202 | two_byte_eol = detect_eol (this, coding.source, src_bytes); |
| 6203 | this_eol = two_byte_eol; |
| 6204 | } |
| 6205 | else |
| 6206 | { |
| 6207 | if (one_byte_eol < 0) |
| 6208 | one_byte_eol =detect_eol (this, coding.source, src_bytes); |
| 6209 | this_eol = one_byte_eol; |
| 6210 | } |
| 6211 | if (this_eol == EOL_SEEN_LF) |
| 6212 | XSETCAR (tail, AREF (eol_type, 0)); |
| 6213 | else if (this_eol == EOL_SEEN_CRLF) |
| 6214 | XSETCAR (tail, AREF (eol_type, 1)); |
| 6215 | else if (this_eol == EOL_SEEN_CR) |
| 6216 | XSETCAR (tail, AREF (eol_type, 2)); |
| 6217 | } |
| 6218 | } |
| 6219 | } |
| 6220 | |
| 6221 | return (highest ? XCAR (val) : val); |
| 6222 | } |
| 6223 | |
| 6224 | |
| 6225 | DEFUN ("detect-coding-region", Fdetect_coding_region, Sdetect_coding_region, |
| 6226 | 2, 3, 0, |
| 6227 | doc: /* Detect coding system of the text in the region between START and END. |
| 6228 | Return a list of possible coding systems ordered by priority. |
| 6229 | |
| 6230 | If only ASCII characters are found, it returns a list of single element |
| 6231 | `undecided' or its subsidiary coding system according to a detected |
| 6232 | end-of-line format. |
| 6233 | |
| 6234 | If optional argument HIGHEST is non-nil, return the coding system of |
| 6235 | highest priority. */) |
| 6236 | (start, end, highest) |
| 6237 | Lisp_Object start, end, highest; |
| 6238 | { |
| 6239 | int from, to; |
| 6240 | int from_byte, to_byte; |
| 6241 | |
| 6242 | CHECK_NUMBER_COERCE_MARKER (start); |
| 6243 | CHECK_NUMBER_COERCE_MARKER (end); |
| 6244 | |
| 6245 | validate_region (&start, &end); |
| 6246 | from = XINT (start), to = XINT (end); |
| 6247 | from_byte = CHAR_TO_BYTE (from); |
| 6248 | to_byte = CHAR_TO_BYTE (to); |
| 6249 | |
| 6250 | if (from < GPT && to >= GPT) |
| 6251 | move_gap_both (to, to_byte); |
| 6252 | |
| 6253 | return detect_coding_system (BYTE_POS_ADDR (from_byte), |
| 6254 | to_byte - from_byte, |
| 6255 | !NILP (highest), |
| 6256 | !NILP (current_buffer |
| 6257 | ->enable_multibyte_characters), |
| 6258 | Qnil); |
| 6259 | } |
| 6260 | |
| 6261 | DEFUN ("detect-coding-string", Fdetect_coding_string, Sdetect_coding_string, |
| 6262 | 1, 2, 0, |
| 6263 | doc: /* Detect coding system of the text in STRING. |
| 6264 | Return a list of possible coding systems ordered by priority. |
| 6265 | |
| 6266 | If only ASCII characters are found, it returns a list of single element |
| 6267 | `undecided' or its subsidiary coding system according to a detected |
| 6268 | end-of-line format. |
| 6269 | |
| 6270 | If optional argument HIGHEST is non-nil, return the coding system of |
| 6271 | highest priority. */) |
| 6272 | (string, highest) |
| 6273 | Lisp_Object string, highest; |
| 6274 | { |
| 6275 | CHECK_STRING (string); |
| 6276 | |
| 6277 | return detect_coding_system (XSTRING (string)->data, |
| 6278 | STRING_BYTES (XSTRING (string)), |
| 6279 | !NILP (highest), |
| 6280 | STRING_MULTIBYTE (string), |
| 6281 | Qnil); |
| 6282 | } |
| 6283 | |
| 6284 | |
| 6285 | static INLINE int |
| 6286 | char_encodable_p (c, attrs) |
| 6287 | int c; |
| 6288 | Lisp_Object attrs; |
| 6289 | { |
| 6290 | Lisp_Object tail; |
| 6291 | struct charset *charset; |
| 6292 | |
| 6293 | for (tail = CODING_ATTR_CHARSET_LIST (attrs); |
| 6294 | CONSP (tail); tail = XCDR (tail)) |
| 6295 | { |
| 6296 | charset = CHARSET_FROM_ID (XINT (XCAR (tail))); |
| 6297 | if (CHAR_CHARSET_P (c, charset)) |
| 6298 | break; |
| 6299 | } |
| 6300 | return (! NILP (tail)); |
| 6301 | } |
| 6302 | |
| 6303 | |
| 6304 | /* Return a list of coding systems that safely encode the text between |
| 6305 | START and END. If EXCLUDE is non-nil, it is a list of coding |
| 6306 | systems not to check. The returned list doesn't contain any such |
| 6307 | coding systems. In any case, If the text contains only ASCII or is |
| 6308 | unibyte, return t. */ |
| 6309 | |
| 6310 | DEFUN ("find-coding-systems-region-internal", |
| 6311 | Ffind_coding_systems_region_internal, |
| 6312 | Sfind_coding_systems_region_internal, 2, 3, 0, |
| 6313 | doc: /* Internal use only. */) |
| 6314 | (start, end, exclude) |
| 6315 | Lisp_Object start, end, exclude; |
| 6316 | { |
| 6317 | Lisp_Object coding_attrs_list, safe_codings; |
| 6318 | EMACS_INT start_byte, end_byte; |
| 6319 | unsigned char *p, *pbeg, *pend; |
| 6320 | int c; |
| 6321 | Lisp_Object tail, elt; |
| 6322 | |
| 6323 | if (STRINGP (start)) |
| 6324 | { |
| 6325 | if (!STRING_MULTIBYTE (start) |
| 6326 | && XSTRING (start)->size != STRING_BYTES (XSTRING (start))) |
| 6327 | return Qt; |
| 6328 | start_byte = 0; |
| 6329 | end_byte = STRING_BYTES (XSTRING (start)); |
| 6330 | } |
| 6331 | else |
| 6332 | { |
| 6333 | CHECK_NUMBER_COERCE_MARKER (start); |
| 6334 | CHECK_NUMBER_COERCE_MARKER (end); |
| 6335 | if (XINT (start) < BEG || XINT (end) > Z || XINT (start) > XINT (end)) |
| 6336 | args_out_of_range (start, end); |
| 6337 | if (NILP (current_buffer->enable_multibyte_characters)) |
| 6338 | return Qt; |
| 6339 | start_byte = CHAR_TO_BYTE (XINT (start)); |
| 6340 | end_byte = CHAR_TO_BYTE (XINT (end)); |
| 6341 | if (XINT (end) - XINT (start) == end_byte - start_byte) |
| 6342 | return Qt; |
| 6343 | |
| 6344 | if (start < GPT && end > GPT) |
| 6345 | { |
| 6346 | if ((GPT - start) < (end - GPT)) |
| 6347 | move_gap_both (start, start_byte); |
| 6348 | else |
| 6349 | move_gap_both (end, end_byte); |
| 6350 | } |
| 6351 | } |
| 6352 | |
| 6353 | coding_attrs_list = Qnil; |
| 6354 | for (tail = Vcoding_system_list; CONSP (tail); tail = XCDR (tail)) |
| 6355 | if (NILP (exclude) |
| 6356 | || NILP (Fmemq (XCAR (tail), exclude))) |
| 6357 | { |
| 6358 | Lisp_Object attrs; |
| 6359 | |
| 6360 | attrs = AREF (CODING_SYSTEM_SPEC (XCAR (tail)), 0); |
| 6361 | if (EQ (XCAR (tail), CODING_ATTR_BASE_NAME (attrs)) |
| 6362 | && ! EQ (CODING_ATTR_TYPE (attrs), Qundecided)) |
| 6363 | coding_attrs_list = Fcons (attrs, coding_attrs_list); |
| 6364 | } |
| 6365 | |
| 6366 | if (STRINGP (start)) |
| 6367 | p = pbeg = XSTRING (start)->data; |
| 6368 | else |
| 6369 | p = pbeg = BYTE_POS_ADDR (start_byte); |
| 6370 | pend = p + (end_byte - start_byte); |
| 6371 | |
| 6372 | while (p < pend && ASCII_BYTE_P (*p)) p++; |
| 6373 | while (p < pend && ASCII_BYTE_P (*(pend - 1))) pend--; |
| 6374 | |
| 6375 | while (p < pend) |
| 6376 | { |
| 6377 | if (ASCII_BYTE_P (*p)) |
| 6378 | p++; |
| 6379 | else |
| 6380 | { |
| 6381 | c = STRING_CHAR_ADVANCE (p); |
| 6382 | |
| 6383 | charset_map_loaded = 0; |
| 6384 | for (tail = coding_attrs_list; CONSP (tail);) |
| 6385 | { |
| 6386 | elt = XCAR (tail); |
| 6387 | if (NILP (elt)) |
| 6388 | tail = XCDR (tail); |
| 6389 | else if (char_encodable_p (c, elt)) |
| 6390 | tail = XCDR (tail); |
| 6391 | else if (CONSP (XCDR (tail))) |
| 6392 | { |
| 6393 | XSETCAR (tail, XCAR (XCDR (tail))); |
| 6394 | XSETCDR (tail, XCDR (XCDR (tail))); |
| 6395 | } |
| 6396 | else |
| 6397 | { |
| 6398 | XSETCAR (tail, Qnil); |
| 6399 | tail = XCDR (tail); |
| 6400 | } |
| 6401 | } |
| 6402 | if (charset_map_loaded) |
| 6403 | { |
| 6404 | EMACS_INT p_offset = p - pbeg, pend_offset = pend - pbeg; |
| 6405 | |
| 6406 | if (STRINGP (start)) |
| 6407 | pbeg = XSTRING (start)->data; |
| 6408 | else |
| 6409 | pbeg = BYTE_POS_ADDR (start_byte); |
| 6410 | p = pbeg + p_offset; |
| 6411 | pend = pbeg + pend_offset; |
| 6412 | } |
| 6413 | } |
| 6414 | } |
| 6415 | |
| 6416 | safe_codings = Qnil; |
| 6417 | for (tail = coding_attrs_list; CONSP (tail); tail = XCDR (tail)) |
| 6418 | if (! NILP (XCAR (tail))) |
| 6419 | safe_codings = Fcons (CODING_ATTR_BASE_NAME (XCAR (tail)), safe_codings); |
| 6420 | |
| 6421 | return safe_codings; |
| 6422 | } |
| 6423 | |
| 6424 | |
| 6425 | DEFUN ("check-coding-systems-region", Fcheck_coding_systems_region, |
| 6426 | Scheck_coding_systems_region, 3, 3, 0, |
| 6427 | doc: /* Check if the region is encodable by coding systems. |
| 6428 | |
| 6429 | START and END are buffer positions specifying the region. |
| 6430 | CODING-SYSTEM-LIST is a list of coding systems to check. |
| 6431 | |
| 6432 | The value is an alist ((CODING-SYSTEM POS0 POS1 ...) ...), where |
| 6433 | CODING-SYSTEM is a member of CODING-SYSTEM-LIst and can't encode the |
| 6434 | whole region, POS0, POS1, ... are buffer positions where non-encodable |
| 6435 | characters are found. |
| 6436 | |
| 6437 | If all coding systems in CODING-SYSTEM-LIST can encode the region, the |
| 6438 | value is nil. |
| 6439 | |
| 6440 | START may be a string. In that case, check if the string is |
| 6441 | encodable, and the value contains indices to the string instead of |
| 6442 | buffer positions. END is ignored. */) |
| 6443 | (start, end, coding_system_list) |
| 6444 | Lisp_Object start, end, coding_system_list; |
| 6445 | { |
| 6446 | Lisp_Object list; |
| 6447 | EMACS_INT start_byte, end_byte; |
| 6448 | int pos; |
| 6449 | unsigned char *p, *pbeg, *pend; |
| 6450 | int c; |
| 6451 | Lisp_Object tail, elt; |
| 6452 | |
| 6453 | if (STRINGP (start)) |
| 6454 | { |
| 6455 | if (!STRING_MULTIBYTE (start) |
| 6456 | && XSTRING (start)->size != STRING_BYTES (XSTRING (start))) |
| 6457 | return Qnil; |
| 6458 | start_byte = 0; |
| 6459 | end_byte = STRING_BYTES (XSTRING (start)); |
| 6460 | pos = 0; |
| 6461 | } |
| 6462 | else |
| 6463 | { |
| 6464 | CHECK_NUMBER_COERCE_MARKER (start); |
| 6465 | CHECK_NUMBER_COERCE_MARKER (end); |
| 6466 | if (XINT (start) < BEG || XINT (end) > Z || XINT (start) > XINT (end)) |
| 6467 | args_out_of_range (start, end); |
| 6468 | if (NILP (current_buffer->enable_multibyte_characters)) |
| 6469 | return Qnil; |
| 6470 | start_byte = CHAR_TO_BYTE (XINT (start)); |
| 6471 | end_byte = CHAR_TO_BYTE (XINT (end)); |
| 6472 | if (XINT (end) - XINT (start) == end_byte - start_byte) |
| 6473 | return Qt; |
| 6474 | |
| 6475 | if (start < GPT && end > GPT) |
| 6476 | { |
| 6477 | if ((GPT - start) < (end - GPT)) |
| 6478 | move_gap_both (start, start_byte); |
| 6479 | else |
| 6480 | move_gap_both (end, end_byte); |
| 6481 | } |
| 6482 | pos = start; |
| 6483 | } |
| 6484 | |
| 6485 | list = Qnil; |
| 6486 | for (tail = coding_system_list; CONSP (tail); tail = XCDR (tail)) |
| 6487 | { |
| 6488 | elt = XCAR (tail); |
| 6489 | list = Fcons (Fcons (elt, Fcons (AREF (CODING_SYSTEM_SPEC (elt), 0), |
| 6490 | Qnil)), |
| 6491 | list); |
| 6492 | } |
| 6493 | |
| 6494 | if (STRINGP (start)) |
| 6495 | p = pbeg = XSTRING (start)->data; |
| 6496 | else |
| 6497 | p = pbeg = BYTE_POS_ADDR (start_byte); |
| 6498 | pend = p + (end_byte - start_byte); |
| 6499 | |
| 6500 | while (p < pend && ASCII_BYTE_P (*p)) p++, pos++; |
| 6501 | while (p < pend && ASCII_BYTE_P (*(pend - 1))) pend--; |
| 6502 | |
| 6503 | while (p < pend) |
| 6504 | { |
| 6505 | if (ASCII_BYTE_P (*p)) |
| 6506 | p++; |
| 6507 | else |
| 6508 | { |
| 6509 | c = STRING_CHAR_ADVANCE (p); |
| 6510 | |
| 6511 | charset_map_loaded = 0; |
| 6512 | for (tail = list; CONSP (tail); tail = XCDR (tail)) |
| 6513 | { |
| 6514 | elt = XCDR (XCAR (tail)); |
| 6515 | if (! char_encodable_p (c, XCAR (elt))) |
| 6516 | XSETCDR (elt, Fcons (make_number (pos), XCDR (elt))); |
| 6517 | } |
| 6518 | if (charset_map_loaded) |
| 6519 | { |
| 6520 | EMACS_INT p_offset = p - pbeg, pend_offset = pend - pbeg; |
| 6521 | |
| 6522 | if (STRINGP (start)) |
| 6523 | pbeg = XSTRING (start)->data; |
| 6524 | else |
| 6525 | pbeg = BYTE_POS_ADDR (start_byte); |
| 6526 | p = pbeg + p_offset; |
| 6527 | pend = pbeg + pend_offset; |
| 6528 | } |
| 6529 | } |
| 6530 | pos++; |
| 6531 | } |
| 6532 | |
| 6533 | tail = list; |
| 6534 | list = Qnil; |
| 6535 | for (; CONSP (tail); tail = XCDR (tail)) |
| 6536 | { |
| 6537 | elt = XCAR (tail); |
| 6538 | if (CONSP (XCDR (XCDR (elt)))) |
| 6539 | list = Fcons (Fcons (XCAR (elt), Fnreverse (XCDR (XCDR (elt)))), |
| 6540 | list); |
| 6541 | } |
| 6542 | |
| 6543 | return list; |
| 6544 | } |
| 6545 | |
| 6546 | |
| 6547 | |
| 6548 | Lisp_Object |
| 6549 | code_convert_region (start, end, coding_system, dst_object, encodep, norecord) |
| 6550 | Lisp_Object start, end, coding_system, dst_object; |
| 6551 | int encodep, norecord; |
| 6552 | { |
| 6553 | struct coding_system coding; |
| 6554 | EMACS_INT from, from_byte, to, to_byte; |
| 6555 | Lisp_Object src_object; |
| 6556 | |
| 6557 | CHECK_NUMBER_COERCE_MARKER (start); |
| 6558 | CHECK_NUMBER_COERCE_MARKER (end); |
| 6559 | if (NILP (coding_system)) |
| 6560 | coding_system = Qno_conversion; |
| 6561 | else |
| 6562 | CHECK_CODING_SYSTEM (coding_system); |
| 6563 | src_object = Fcurrent_buffer (); |
| 6564 | if (NILP (dst_object)) |
| 6565 | dst_object = src_object; |
| 6566 | else if (! EQ (dst_object, Qt)) |
| 6567 | CHECK_BUFFER (dst_object); |
| 6568 | |
| 6569 | validate_region (&start, &end); |
| 6570 | from = XFASTINT (start); |
| 6571 | from_byte = CHAR_TO_BYTE (from); |
| 6572 | to = XFASTINT (end); |
| 6573 | to_byte = CHAR_TO_BYTE (to); |
| 6574 | |
| 6575 | setup_coding_system (coding_system, &coding); |
| 6576 | coding.mode |= CODING_MODE_LAST_BLOCK; |
| 6577 | |
| 6578 | if (encodep) |
| 6579 | encode_coding_object (&coding, src_object, from, from_byte, to, to_byte, |
| 6580 | dst_object); |
| 6581 | else |
| 6582 | decode_coding_object (&coding, src_object, from, from_byte, to, to_byte, |
| 6583 | dst_object); |
| 6584 | if (! norecord) |
| 6585 | Vlast_coding_system_used = CODING_ID_NAME (coding.id); |
| 6586 | |
| 6587 | if (coding.result != CODING_RESULT_SUCCESS) |
| 6588 | error ("Code conversion error: %d", coding.result); |
| 6589 | |
| 6590 | return (BUFFERP (dst_object) |
| 6591 | ? make_number (coding.produced_char) |
| 6592 | : coding.dst_object); |
| 6593 | } |
| 6594 | |
| 6595 | |
| 6596 | DEFUN ("decode-coding-region", Fdecode_coding_region, Sdecode_coding_region, |
| 6597 | 3, 4, "r\nzCoding system: ", |
| 6598 | doc: /* Decode the current region from the specified coding system. |
| 6599 | When called from a program, takes four arguments: |
| 6600 | START, END, CODING-SYSTEM, and DESTINATION. |
| 6601 | START and END are buffer positions. |
| 6602 | |
| 6603 | Optional 4th arguments DESTINATION specifies where the decoded text goes. |
| 6604 | If nil, the region between START and END is replace by the decoded text. |
| 6605 | If buffer, the decoded text is inserted in the buffer. |
| 6606 | If t, the decoded text is returned. |
| 6607 | |
| 6608 | This function sets `last-coding-system-used' to the precise coding system |
| 6609 | used (which may be different from CODING-SYSTEM if CODING-SYSTEM is |
| 6610 | not fully specified.) |
| 6611 | It returns the length of the decoded text. */) |
| 6612 | (start, end, coding_system, destination) |
| 6613 | Lisp_Object start, end, coding_system, destination; |
| 6614 | { |
| 6615 | return code_convert_region (start, end, coding_system, destination, 0, 0); |
| 6616 | } |
| 6617 | |
| 6618 | DEFUN ("encode-coding-region", Fencode_coding_region, Sencode_coding_region, |
| 6619 | 3, 4, "r\nzCoding system: ", |
| 6620 | doc: /* Encode the current region by specified coding system. |
| 6621 | When called from a program, takes three arguments: |
| 6622 | START, END, and CODING-SYSTEM. START and END are buffer positions. |
| 6623 | |
| 6624 | Optional 4th arguments DESTINATION specifies where the encoded text goes. |
| 6625 | If nil, the region between START and END is replace by the encoded text. |
| 6626 | If buffer, the encoded text is inserted in the buffer. |
| 6627 | If t, the encoded text is returned. |
| 6628 | |
| 6629 | This function sets `last-coding-system-used' to the precise coding system |
| 6630 | used (which may be different from CODING-SYSTEM if CODING-SYSTEM is |
| 6631 | not fully specified.) |
| 6632 | It returns the length of the encoded text. */) |
| 6633 | (start, end, coding_system, destination) |
| 6634 | Lisp_Object start, end, coding_system, destination; |
| 6635 | { |
| 6636 | return code_convert_region (start, end, coding_system, destination, 1, 0); |
| 6637 | } |
| 6638 | |
| 6639 | Lisp_Object |
| 6640 | code_convert_string (string, coding_system, dst_object, |
| 6641 | encodep, nocopy, norecord) |
| 6642 | Lisp_Object string, coding_system, dst_object; |
| 6643 | int encodep, nocopy, norecord; |
| 6644 | { |
| 6645 | struct coding_system coding; |
| 6646 | EMACS_INT chars, bytes; |
| 6647 | |
| 6648 | CHECK_STRING (string); |
| 6649 | if (NILP (coding_system)) |
| 6650 | { |
| 6651 | if (! norecord) |
| 6652 | Vlast_coding_system_used = Qno_conversion; |
| 6653 | if (NILP (dst_object)) |
| 6654 | return (nocopy ? Fcopy_sequence (string) : string); |
| 6655 | } |
| 6656 | |
| 6657 | if (NILP (coding_system)) |
| 6658 | coding_system = Qno_conversion; |
| 6659 | else |
| 6660 | CHECK_CODING_SYSTEM (coding_system); |
| 6661 | if (NILP (dst_object)) |
| 6662 | dst_object = Qt; |
| 6663 | else if (! EQ (dst_object, Qt)) |
| 6664 | CHECK_BUFFER (dst_object); |
| 6665 | |
| 6666 | setup_coding_system (coding_system, &coding); |
| 6667 | coding.mode |= CODING_MODE_LAST_BLOCK; |
| 6668 | chars = XSTRING (string)->size; |
| 6669 | bytes = STRING_BYTES (XSTRING (string)); |
| 6670 | if (encodep) |
| 6671 | encode_coding_object (&coding, string, 0, 0, chars, bytes, dst_object); |
| 6672 | else |
| 6673 | decode_coding_object (&coding, string, 0, 0, chars, bytes, dst_object); |
| 6674 | if (! norecord) |
| 6675 | Vlast_coding_system_used = CODING_ID_NAME (coding.id); |
| 6676 | |
| 6677 | if (coding.result != CODING_RESULT_SUCCESS) |
| 6678 | error ("Code conversion error: %d", coding.result); |
| 6679 | |
| 6680 | return (BUFFERP (dst_object) |
| 6681 | ? make_number (coding.produced_char) |
| 6682 | : coding.dst_object); |
| 6683 | } |
| 6684 | |
| 6685 | |
| 6686 | /* Encode or decode STRING according to CODING_SYSTEM. |
| 6687 | Do not set Vlast_coding_system_used. |
| 6688 | |
| 6689 | This function is called only from macros DECODE_FILE and |
| 6690 | ENCODE_FILE, thus we ignore character composition. */ |
| 6691 | |
| 6692 | Lisp_Object |
| 6693 | code_convert_string_norecord (string, coding_system, encodep) |
| 6694 | Lisp_Object string, coding_system; |
| 6695 | int encodep; |
| 6696 | { |
| 6697 | return code_convert_string (string, coding_system, Qt, encodep, 0, 1); |
| 6698 | } |
| 6699 | |
| 6700 | |
| 6701 | DEFUN ("decode-coding-string", Fdecode_coding_string, Sdecode_coding_string, |
| 6702 | 2, 4, 0, |
| 6703 | doc: /* Decode STRING which is encoded in CODING-SYSTEM, and return the result. |
| 6704 | |
| 6705 | Optional third arg NOCOPY non-nil means it is OK to return STRING itself |
| 6706 | if the decoding operation is trivial. |
| 6707 | |
| 6708 | Optional fourth arg BUFFER non-nil meant that the decoded text is |
| 6709 | inserted in BUFFER instead of returned as a astring. In this case, |
| 6710 | the return value is BUFFER. |
| 6711 | |
| 6712 | This function sets `last-coding-system-used' to the precise coding system |
| 6713 | used (which may be different from CODING-SYSTEM if CODING-SYSTEM is |
| 6714 | not fully specified. */) |
| 6715 | (string, coding_system, nocopy, buffer) |
| 6716 | Lisp_Object string, coding_system, nocopy, buffer; |
| 6717 | { |
| 6718 | return code_convert_string (string, coding_system, buffer, |
| 6719 | 0, ! NILP (nocopy), 0); |
| 6720 | } |
| 6721 | |
| 6722 | DEFUN ("encode-coding-string", Fencode_coding_string, Sencode_coding_string, |
| 6723 | 2, 4, 0, |
| 6724 | doc: /* Encode STRING to CODING-SYSTEM, and return the result. |
| 6725 | |
| 6726 | Optional third arg NOCOPY non-nil means it is OK to return STRING |
| 6727 | itself if the encoding operation is trivial. |
| 6728 | |
| 6729 | Optional fourth arg BUFFER non-nil meant that the encoded text is |
| 6730 | inserted in BUFFER instead of returned as a astring. In this case, |
| 6731 | the return value is BUFFER. |
| 6732 | |
| 6733 | This function sets `last-coding-system-used' to the precise coding system |
| 6734 | used (which may be different from CODING-SYSTEM if CODING-SYSTEM is |
| 6735 | not fully specified.) */) |
| 6736 | (string, coding_system, nocopy, buffer) |
| 6737 | Lisp_Object string, coding_system, nocopy, buffer; |
| 6738 | { |
| 6739 | return code_convert_string (string, coding_system, buffer, |
| 6740 | nocopy, ! NILP (nocopy), 1); |
| 6741 | } |
| 6742 | |
| 6743 | \f |
| 6744 | DEFUN ("decode-sjis-char", Fdecode_sjis_char, Sdecode_sjis_char, 1, 1, 0, |
| 6745 | doc: /* Decode a Japanese character which has CODE in shift_jis encoding. |
| 6746 | Return the corresponding character. */) |
| 6747 | (code) |
| 6748 | Lisp_Object code; |
| 6749 | { |
| 6750 | Lisp_Object spec, attrs, val; |
| 6751 | struct charset *charset_roman, *charset_kanji, *charset_kana, *charset; |
| 6752 | int c; |
| 6753 | |
| 6754 | CHECK_NATNUM (code); |
| 6755 | c = XFASTINT (code); |
| 6756 | CHECK_CODING_SYSTEM_GET_SPEC (Vsjis_coding_system, spec); |
| 6757 | attrs = AREF (spec, 0); |
| 6758 | |
| 6759 | if (ASCII_BYTE_P (c) |
| 6760 | && ! NILP (CODING_ATTR_ASCII_COMPAT (attrs))) |
| 6761 | return code; |
| 6762 | |
| 6763 | val = CODING_ATTR_CHARSET_LIST (attrs); |
| 6764 | charset_roman = CHARSET_FROM_ID (XINT (XCAR (val))), val = XCDR (val); |
| 6765 | charset_kanji = CHARSET_FROM_ID (XINT (XCAR (val))), val = XCDR (val); |
| 6766 | charset_kana = CHARSET_FROM_ID (XINT (XCAR (val))); |
| 6767 | |
| 6768 | if (c <= 0x7F) |
| 6769 | charset = charset_roman; |
| 6770 | else if (c >= 0xA0 && c < 0xDF) |
| 6771 | { |
| 6772 | charset = charset_kana; |
| 6773 | c -= 0x80; |
| 6774 | } |
| 6775 | else |
| 6776 | { |
| 6777 | int s1 = c >> 8, s2 = c & 0x7F; |
| 6778 | |
| 6779 | if (s1 < 0x81 || (s1 > 0x9F && s1 < 0xE0) || s1 > 0xEF |
| 6780 | || s2 < 0x40 || s2 == 0x7F || s2 > 0xFC) |
| 6781 | error ("Invalid code: %d", code); |
| 6782 | SJIS_TO_JIS (c); |
| 6783 | charset = charset_kanji; |
| 6784 | } |
| 6785 | c = DECODE_CHAR (charset, c); |
| 6786 | if (c < 0) |
| 6787 | error ("Invalid code: %d", code); |
| 6788 | return make_number (c); |
| 6789 | } |
| 6790 | |
| 6791 | |
| 6792 | DEFUN ("encode-sjis-char", Fencode_sjis_char, Sencode_sjis_char, 1, 1, 0, |
| 6793 | doc: /* Encode a Japanese character CHAR to shift_jis encoding. |
| 6794 | Return the corresponding code in SJIS. */) |
| 6795 | (ch) |
| 6796 | Lisp_Object ch; |
| 6797 | { |
| 6798 | Lisp_Object spec, attrs, charset_list; |
| 6799 | int c; |
| 6800 | struct charset *charset; |
| 6801 | unsigned code; |
| 6802 | |
| 6803 | CHECK_CHARACTER (ch); |
| 6804 | c = XFASTINT (ch); |
| 6805 | CHECK_CODING_SYSTEM_GET_SPEC (Vsjis_coding_system, spec); |
| 6806 | attrs = AREF (spec, 0); |
| 6807 | |
| 6808 | if (ASCII_CHAR_P (c) |
| 6809 | && ! NILP (CODING_ATTR_ASCII_COMPAT (attrs))) |
| 6810 | return ch; |
| 6811 | |
| 6812 | charset_list = CODING_ATTR_CHARSET_LIST (attrs); |
| 6813 | charset = char_charset (c, charset_list, &code); |
| 6814 | if (code == CHARSET_INVALID_CODE (charset)) |
| 6815 | error ("Can't encode by shift_jis encoding: %d", c); |
| 6816 | JIS_TO_SJIS (code); |
| 6817 | |
| 6818 | return make_number (code); |
| 6819 | } |
| 6820 | |
| 6821 | DEFUN ("decode-big5-char", Fdecode_big5_char, Sdecode_big5_char, 1, 1, 0, |
| 6822 | doc: /* Decode a Big5 character which has CODE in BIG5 coding system. |
| 6823 | Return the corresponding character. */) |
| 6824 | (code) |
| 6825 | Lisp_Object code; |
| 6826 | { |
| 6827 | Lisp_Object spec, attrs, val; |
| 6828 | struct charset *charset_roman, *charset_big5, *charset; |
| 6829 | int c; |
| 6830 | |
| 6831 | CHECK_NATNUM (code); |
| 6832 | c = XFASTINT (code); |
| 6833 | CHECK_CODING_SYSTEM_GET_SPEC (Vbig5_coding_system, spec); |
| 6834 | attrs = AREF (spec, 0); |
| 6835 | |
| 6836 | if (ASCII_BYTE_P (c) |
| 6837 | && ! NILP (CODING_ATTR_ASCII_COMPAT (attrs))) |
| 6838 | return code; |
| 6839 | |
| 6840 | val = CODING_ATTR_CHARSET_LIST (attrs); |
| 6841 | charset_roman = CHARSET_FROM_ID (XINT (XCAR (val))), val = XCDR (val); |
| 6842 | charset_big5 = CHARSET_FROM_ID (XINT (XCAR (val))); |
| 6843 | |
| 6844 | if (c <= 0x7F) |
| 6845 | charset = charset_roman; |
| 6846 | else |
| 6847 | { |
| 6848 | int b1 = c >> 8, b2 = c & 0x7F; |
| 6849 | if (b1 < 0xA1 || b1 > 0xFE |
| 6850 | || b2 < 0x40 || (b2 > 0x7E && b2 < 0xA1) || b2 > 0xFE) |
| 6851 | error ("Invalid code: %d", code); |
| 6852 | charset = charset_big5; |
| 6853 | } |
| 6854 | c = DECODE_CHAR (charset, (unsigned )c); |
| 6855 | if (c < 0) |
| 6856 | error ("Invalid code: %d", code); |
| 6857 | return make_number (c); |
| 6858 | } |
| 6859 | |
| 6860 | DEFUN ("encode-big5-char", Fencode_big5_char, Sencode_big5_char, 1, 1, 0, |
| 6861 | doc: /* Encode the Big5 character CHAR to BIG5 coding system. |
| 6862 | Return the corresponding character code in Big5. */) |
| 6863 | (ch) |
| 6864 | Lisp_Object ch; |
| 6865 | { |
| 6866 | Lisp_Object spec, attrs, charset_list; |
| 6867 | struct charset *charset; |
| 6868 | int c; |
| 6869 | unsigned code; |
| 6870 | |
| 6871 | CHECK_CHARACTER (ch); |
| 6872 | c = XFASTINT (ch); |
| 6873 | CHECK_CODING_SYSTEM_GET_SPEC (Vbig5_coding_system, spec); |
| 6874 | attrs = AREF (spec, 0); |
| 6875 | if (ASCII_CHAR_P (c) |
| 6876 | && ! NILP (CODING_ATTR_ASCII_COMPAT (attrs))) |
| 6877 | return ch; |
| 6878 | |
| 6879 | charset_list = CODING_ATTR_CHARSET_LIST (attrs); |
| 6880 | charset = char_charset (c, charset_list, &code); |
| 6881 | if (code == CHARSET_INVALID_CODE (charset)) |
| 6882 | error ("Can't encode by Big5 encoding: %d", c); |
| 6883 | |
| 6884 | return make_number (code); |
| 6885 | } |
| 6886 | |
| 6887 | \f |
| 6888 | DEFUN ("set-terminal-coding-system-internal", |
| 6889 | Fset_terminal_coding_system_internal, |
| 6890 | Sset_terminal_coding_system_internal, 1, 1, 0, |
| 6891 | doc: /* Internal use only. */) |
| 6892 | (coding_system) |
| 6893 | { |
| 6894 | CHECK_SYMBOL (coding_system); |
| 6895 | setup_coding_system (Fcheck_coding_system (coding_system), |
| 6896 | &terminal_coding); |
| 6897 | |
| 6898 | /* We had better not send unsafe characters to terminal. */ |
| 6899 | terminal_coding.mode |= CODING_MODE_SAFE_ENCODING; |
| 6900 | /* Characer composition should be disabled. */ |
| 6901 | terminal_coding.common_flags &= ~CODING_ANNOTATE_COMPOSITION_MASK; |
| 6902 | terminal_coding.src_multibyte = 1; |
| 6903 | terminal_coding.dst_multibyte = 0; |
| 6904 | return Qnil; |
| 6905 | } |
| 6906 | |
| 6907 | DEFUN ("set-safe-terminal-coding-system-internal", |
| 6908 | Fset_safe_terminal_coding_system_internal, |
| 6909 | Sset_safe_terminal_coding_system_internal, 1, 1, 0, |
| 6910 | doc: /* Internal use only. */) |
| 6911 | (coding_system) |
| 6912 | { |
| 6913 | CHECK_SYMBOL (coding_system); |
| 6914 | setup_coding_system (Fcheck_coding_system (coding_system), |
| 6915 | &safe_terminal_coding); |
| 6916 | /* Characer composition should be disabled. */ |
| 6917 | safe_terminal_coding.common_flags &= ~CODING_ANNOTATE_COMPOSITION_MASK; |
| 6918 | safe_terminal_coding.src_multibyte = 1; |
| 6919 | safe_terminal_coding.dst_multibyte = 0; |
| 6920 | return Qnil; |
| 6921 | } |
| 6922 | |
| 6923 | DEFUN ("terminal-coding-system", |
| 6924 | Fterminal_coding_system, Sterminal_coding_system, 0, 0, 0, |
| 6925 | doc: /* Return coding system specified for terminal output. */) |
| 6926 | () |
| 6927 | { |
| 6928 | return CODING_ID_NAME (terminal_coding.id); |
| 6929 | } |
| 6930 | |
| 6931 | DEFUN ("set-keyboard-coding-system-internal", |
| 6932 | Fset_keyboard_coding_system_internal, |
| 6933 | Sset_keyboard_coding_system_internal, 1, 1, 0, |
| 6934 | doc: /* Internal use only. */) |
| 6935 | (coding_system) |
| 6936 | Lisp_Object coding_system; |
| 6937 | { |
| 6938 | CHECK_SYMBOL (coding_system); |
| 6939 | setup_coding_system (Fcheck_coding_system (coding_system), |
| 6940 | &keyboard_coding); |
| 6941 | /* Characer composition should be disabled. */ |
| 6942 | keyboard_coding.common_flags &= ~CODING_ANNOTATE_COMPOSITION_MASK; |
| 6943 | return Qnil; |
| 6944 | } |
| 6945 | |
| 6946 | DEFUN ("keyboard-coding-system", |
| 6947 | Fkeyboard_coding_system, Skeyboard_coding_system, 0, 0, 0, |
| 6948 | doc: /* Return coding system specified for decoding keyboard input. */) |
| 6949 | () |
| 6950 | { |
| 6951 | return CODING_ID_NAME (keyboard_coding.id); |
| 6952 | } |
| 6953 | |
| 6954 | \f |
| 6955 | DEFUN ("find-operation-coding-system", Ffind_operation_coding_system, |
| 6956 | Sfind_operation_coding_system, 1, MANY, 0, |
| 6957 | doc: /* Choose a coding system for an operation based on the target name. |
| 6958 | The value names a pair of coding systems: (DECODING-SYSTEM . ENCODING-SYSTEM). |
| 6959 | DECODING-SYSTEM is the coding system to use for decoding |
| 6960 | \(in case OPERATION does decoding), and ENCODING-SYSTEM is the coding system |
| 6961 | for encoding (in case OPERATION does encoding). |
| 6962 | |
| 6963 | The first argument OPERATION specifies an I/O primitive: |
| 6964 | For file I/O, `insert-file-contents' or `write-region'. |
| 6965 | For process I/O, `call-process', `call-process-region', or `start-process'. |
| 6966 | For network I/O, `open-network-stream'. |
| 6967 | |
| 6968 | The remaining arguments should be the same arguments that were passed |
| 6969 | to the primitive. Depending on which primitive, one of those arguments |
| 6970 | is selected as the TARGET. For example, if OPERATION does file I/O, |
| 6971 | whichever argument specifies the file name is TARGET. |
| 6972 | |
| 6973 | TARGET has a meaning which depends on OPERATION: |
| 6974 | For file I/O, TARGET is a file name. |
| 6975 | For process I/O, TARGET is a process name. |
| 6976 | For network I/O, TARGET is a service name or a port number |
| 6977 | |
| 6978 | This function looks up what specified for TARGET in, |
| 6979 | `file-coding-system-alist', `process-coding-system-alist', |
| 6980 | or `network-coding-system-alist' depending on OPERATION. |
| 6981 | They may specify a coding system, a cons of coding systems, |
| 6982 | or a function symbol to call. |
| 6983 | In the last case, we call the function with one argument, |
| 6984 | which is a list of all the arguments given to this function. |
| 6985 | |
| 6986 | usage: (find-operation-coding-system OPERATION ARGUMENTS ...) */) |
| 6987 | (nargs, args) |
| 6988 | int nargs; |
| 6989 | Lisp_Object *args; |
| 6990 | { |
| 6991 | Lisp_Object operation, target_idx, target, val; |
| 6992 | register Lisp_Object chain; |
| 6993 | |
| 6994 | if (nargs < 2) |
| 6995 | error ("Too few arguments"); |
| 6996 | operation = args[0]; |
| 6997 | if (!SYMBOLP (operation) |
| 6998 | || !INTEGERP (target_idx = Fget (operation, Qtarget_idx))) |
| 6999 | error ("Invalid first arguement"); |
| 7000 | if (nargs < 1 + XINT (target_idx)) |
| 7001 | error ("Too few arguments for operation: %s", |
| 7002 | XSYMBOL (operation)->name->data); |
| 7003 | target = args[XINT (target_idx) + 1]; |
| 7004 | if (!(STRINGP (target) |
| 7005 | || (EQ (operation, Qopen_network_stream) && INTEGERP (target)))) |
| 7006 | error ("Invalid %dth argument", XINT (target_idx) + 1); |
| 7007 | |
| 7008 | chain = ((EQ (operation, Qinsert_file_contents) |
| 7009 | || EQ (operation, Qwrite_region)) |
| 7010 | ? Vfile_coding_system_alist |
| 7011 | : (EQ (operation, Qopen_network_stream) |
| 7012 | ? Vnetwork_coding_system_alist |
| 7013 | : Vprocess_coding_system_alist)); |
| 7014 | if (NILP (chain)) |
| 7015 | return Qnil; |
| 7016 | |
| 7017 | for (; CONSP (chain); chain = XCDR (chain)) |
| 7018 | { |
| 7019 | Lisp_Object elt; |
| 7020 | |
| 7021 | elt = XCAR (chain); |
| 7022 | if (CONSP (elt) |
| 7023 | && ((STRINGP (target) |
| 7024 | && STRINGP (XCAR (elt)) |
| 7025 | && fast_string_match (XCAR (elt), target) >= 0) |
| 7026 | || (INTEGERP (target) && EQ (target, XCAR (elt))))) |
| 7027 | { |
| 7028 | val = XCDR (elt); |
| 7029 | /* Here, if VAL is both a valid coding system and a valid |
| 7030 | function symbol, we return VAL as a coding system. */ |
| 7031 | if (CONSP (val)) |
| 7032 | return val; |
| 7033 | if (! SYMBOLP (val)) |
| 7034 | return Qnil; |
| 7035 | if (! NILP (Fcoding_system_p (val))) |
| 7036 | return Fcons (val, val); |
| 7037 | if (! NILP (Ffboundp (val))) |
| 7038 | { |
| 7039 | val = call1 (val, Flist (nargs, args)); |
| 7040 | if (CONSP (val)) |
| 7041 | return val; |
| 7042 | if (SYMBOLP (val) && ! NILP (Fcoding_system_p (val))) |
| 7043 | return Fcons (val, val); |
| 7044 | } |
| 7045 | return Qnil; |
| 7046 | } |
| 7047 | } |
| 7048 | return Qnil; |
| 7049 | } |
| 7050 | |
| 7051 | DEFUN ("set-coding-system-priority", Fset_coding_system_priority, |
| 7052 | Sset_coding_system_priority, 1, MANY, 0, |
| 7053 | doc: /* Put higher priority to coding systems of the arguments. */) |
| 7054 | (nargs, args) |
| 7055 | int nargs; |
| 7056 | Lisp_Object *args; |
| 7057 | { |
| 7058 | int i, j; |
| 7059 | int changed[coding_category_max]; |
| 7060 | enum coding_category priorities[coding_category_max]; |
| 7061 | |
| 7062 | bzero (changed, sizeof changed); |
| 7063 | |
| 7064 | for (i = j = 0; i < nargs; i++) |
| 7065 | { |
| 7066 | enum coding_category category; |
| 7067 | Lisp_Object spec, attrs; |
| 7068 | |
| 7069 | CHECK_CODING_SYSTEM_GET_SPEC (args[i], spec); |
| 7070 | attrs = AREF (spec, 0); |
| 7071 | category = XINT (CODING_ATTR_CATEGORY (attrs)); |
| 7072 | if (changed[category]) |
| 7073 | /* Ignore this coding system because a coding system of the |
| 7074 | same category already had a higher priority. */ |
| 7075 | continue; |
| 7076 | changed[category] = 1; |
| 7077 | priorities[j++] = category; |
| 7078 | if (coding_categories[category].id >= 0 |
| 7079 | && ! EQ (args[i], CODING_ID_NAME (coding_categories[category].id))) |
| 7080 | setup_coding_system (args[i], &coding_categories[category]); |
| 7081 | } |
| 7082 | |
| 7083 | /* Now we have decided top J priorities. Reflect the order of the |
| 7084 | original priorities to the remaining priorities. */ |
| 7085 | |
| 7086 | for (i = j, j = 0; i < coding_category_max; i++, j++) |
| 7087 | { |
| 7088 | while (j < coding_category_max |
| 7089 | && changed[coding_priorities[j]]) |
| 7090 | j++; |
| 7091 | if (j == coding_category_max) |
| 7092 | abort (); |
| 7093 | priorities[i] = coding_priorities[j]; |
| 7094 | } |
| 7095 | |
| 7096 | bcopy (priorities, coding_priorities, sizeof priorities); |
| 7097 | return Qnil; |
| 7098 | } |
| 7099 | |
| 7100 | DEFUN ("coding-system-priority-list", Fcoding_system_priority_list, |
| 7101 | Scoding_system_priority_list, 0, 1, 0, |
| 7102 | doc: /* Return a list of coding systems ordered by their priorities. */) |
| 7103 | (highestp) |
| 7104 | Lisp_Object highestp; |
| 7105 | { |
| 7106 | int i; |
| 7107 | Lisp_Object val; |
| 7108 | |
| 7109 | for (i = 0, val = Qnil; i < coding_category_max; i++) |
| 7110 | { |
| 7111 | enum coding_category category = coding_priorities[i]; |
| 7112 | int id = coding_categories[category].id; |
| 7113 | Lisp_Object attrs; |
| 7114 | |
| 7115 | if (id < 0) |
| 7116 | continue; |
| 7117 | attrs = CODING_ID_ATTRS (id); |
| 7118 | if (! NILP (highestp)) |
| 7119 | return CODING_ATTR_BASE_NAME (attrs); |
| 7120 | val = Fcons (CODING_ATTR_BASE_NAME (attrs), val); |
| 7121 | } |
| 7122 | return Fnreverse (val); |
| 7123 | } |
| 7124 | |
| 7125 | static Lisp_Object |
| 7126 | make_subsidiaries (base) |
| 7127 | Lisp_Object base; |
| 7128 | { |
| 7129 | Lisp_Object subsidiaries; |
| 7130 | char *suffixes[] = { "-unix", "-dos", "-mac" }; |
| 7131 | int base_name_len = STRING_BYTES (XSYMBOL (base)->name); |
| 7132 | char *buf = (char *) alloca (base_name_len + 6); |
| 7133 | int i; |
| 7134 | |
| 7135 | bcopy (XSYMBOL (base)->name->data, buf, base_name_len); |
| 7136 | subsidiaries = Fmake_vector (make_number (3), Qnil); |
| 7137 | for (i = 0; i < 3; i++) |
| 7138 | { |
| 7139 | bcopy (suffixes[i], buf + base_name_len, strlen (suffixes[i]) + 1); |
| 7140 | ASET (subsidiaries, i, intern (buf)); |
| 7141 | } |
| 7142 | return subsidiaries; |
| 7143 | } |
| 7144 | |
| 7145 | |
| 7146 | DEFUN ("define-coding-system-internal", Fdefine_coding_system_internal, |
| 7147 | Sdefine_coding_system_internal, coding_arg_max, MANY, 0, |
| 7148 | doc: /* For internal use only. */) |
| 7149 | (nargs, args) |
| 7150 | int nargs; |
| 7151 | Lisp_Object *args; |
| 7152 | { |
| 7153 | Lisp_Object name; |
| 7154 | Lisp_Object spec_vec; /* [ ATTRS ALIASE EOL_TYPE ] */ |
| 7155 | Lisp_Object attrs; /* Vector of attributes. */ |
| 7156 | Lisp_Object eol_type; |
| 7157 | Lisp_Object aliases; |
| 7158 | Lisp_Object coding_type, charset_list, safe_charsets; |
| 7159 | enum coding_category category; |
| 7160 | Lisp_Object tail, val; |
| 7161 | int max_charset_id = 0; |
| 7162 | int i; |
| 7163 | |
| 7164 | if (nargs < coding_arg_max) |
| 7165 | goto short_args; |
| 7166 | |
| 7167 | attrs = Fmake_vector (make_number (coding_attr_last_index), Qnil); |
| 7168 | |
| 7169 | name = args[coding_arg_name]; |
| 7170 | CHECK_SYMBOL (name); |
| 7171 | CODING_ATTR_BASE_NAME (attrs) = name; |
| 7172 | |
| 7173 | val = args[coding_arg_mnemonic]; |
| 7174 | if (! STRINGP (val)) |
| 7175 | CHECK_CHARACTER (val); |
| 7176 | CODING_ATTR_MNEMONIC (attrs) = val; |
| 7177 | |
| 7178 | coding_type = args[coding_arg_coding_type]; |
| 7179 | CHECK_SYMBOL (coding_type); |
| 7180 | CODING_ATTR_TYPE (attrs) = coding_type; |
| 7181 | |
| 7182 | charset_list = args[coding_arg_charset_list]; |
| 7183 | if (SYMBOLP (charset_list)) |
| 7184 | { |
| 7185 | if (EQ (charset_list, Qiso_2022)) |
| 7186 | { |
| 7187 | if (! EQ (coding_type, Qiso_2022)) |
| 7188 | error ("Invalid charset-list"); |
| 7189 | charset_list = Viso_2022_charset_list; |
| 7190 | } |
| 7191 | else if (EQ (charset_list, Qemacs_mule)) |
| 7192 | { |
| 7193 | if (! EQ (coding_type, Qemacs_mule)) |
| 7194 | error ("Invalid charset-list"); |
| 7195 | charset_list = Vemacs_mule_charset_list; |
| 7196 | } |
| 7197 | for (tail = charset_list; CONSP (tail); tail = XCDR (tail)) |
| 7198 | if (max_charset_id < XFASTINT (XCAR (tail))) |
| 7199 | max_charset_id = XFASTINT (XCAR (tail)); |
| 7200 | } |
| 7201 | else |
| 7202 | { |
| 7203 | charset_list = Fcopy_sequence (charset_list); |
| 7204 | for (tail = charset_list; !NILP (tail); tail = Fcdr (tail)) |
| 7205 | { |
| 7206 | struct charset *charset; |
| 7207 | |
| 7208 | val = Fcar (tail); |
| 7209 | CHECK_CHARSET_GET_CHARSET (val, charset); |
| 7210 | if (EQ (coding_type, Qiso_2022) |
| 7211 | ? CHARSET_ISO_FINAL (charset) < 0 |
| 7212 | : EQ (coding_type, Qemacs_mule) |
| 7213 | ? CHARSET_EMACS_MULE_ID (charset) < 0 |
| 7214 | : 0) |
| 7215 | error ("Can't handle charset `%s'", |
| 7216 | XSYMBOL (CHARSET_NAME (charset))->name->data); |
| 7217 | |
| 7218 | XCAR (tail) = make_number (charset->id); |
| 7219 | if (max_charset_id < charset->id) |
| 7220 | max_charset_id = charset->id; |
| 7221 | } |
| 7222 | } |
| 7223 | CODING_ATTR_CHARSET_LIST (attrs) = charset_list; |
| 7224 | |
| 7225 | safe_charsets = Fmake_string (make_number (max_charset_id + 1), |
| 7226 | make_number (255)); |
| 7227 | for (tail = charset_list; CONSP (tail); tail = XCDR (tail)) |
| 7228 | XSTRING (safe_charsets)->data[XFASTINT (XCAR (tail))] = 0; |
| 7229 | CODING_ATTR_SAFE_CHARSETS (attrs) = safe_charsets; |
| 7230 | |
| 7231 | val = args[coding_arg_decode_translation_table]; |
| 7232 | if (! NILP (val)) |
| 7233 | CHECK_CHAR_TABLE (val); |
| 7234 | CODING_ATTR_DECODE_TBL (attrs) = val; |
| 7235 | |
| 7236 | val = args[coding_arg_encode_translation_table]; |
| 7237 | if (! NILP (val)) |
| 7238 | CHECK_CHAR_TABLE (val); |
| 7239 | CODING_ATTR_ENCODE_TBL (attrs) = val; |
| 7240 | |
| 7241 | val = args[coding_arg_post_read_conversion]; |
| 7242 | CHECK_SYMBOL (val); |
| 7243 | CODING_ATTR_POST_READ (attrs) = val; |
| 7244 | |
| 7245 | val = args[coding_arg_pre_write_conversion]; |
| 7246 | CHECK_SYMBOL (val); |
| 7247 | CODING_ATTR_PRE_WRITE (attrs) = val; |
| 7248 | |
| 7249 | val = args[coding_arg_default_char]; |
| 7250 | if (NILP (val)) |
| 7251 | CODING_ATTR_DEFAULT_CHAR (attrs) = make_number (' '); |
| 7252 | else |
| 7253 | { |
| 7254 | CHECK_CHARACTER (val); |
| 7255 | CODING_ATTR_DEFAULT_CHAR (attrs) = val; |
| 7256 | } |
| 7257 | |
| 7258 | val = args[coding_arg_plist]; |
| 7259 | CHECK_LIST (val); |
| 7260 | CODING_ATTR_PLIST (attrs) = val; |
| 7261 | |
| 7262 | if (EQ (coding_type, Qcharset)) |
| 7263 | { |
| 7264 | val = Fmake_vector (make_number (256), Qnil); |
| 7265 | |
| 7266 | for (tail = charset_list; CONSP (tail); tail = XCDR (tail)) |
| 7267 | { |
| 7268 | struct charset *charset = CHARSET_FROM_ID (XINT (XCAR (tail))); |
| 7269 | |
| 7270 | for (i = charset->code_space[0]; i <= charset->code_space[1]; i++) |
| 7271 | if (NILP (AREF (val, i))) |
| 7272 | ASET (val, i, XCAR (tail)); |
| 7273 | } |
| 7274 | ASET (attrs, coding_attr_charset_valids, val); |
| 7275 | category = coding_category_charset; |
| 7276 | } |
| 7277 | else if (EQ (coding_type, Qccl)) |
| 7278 | { |
| 7279 | Lisp_Object valids; |
| 7280 | |
| 7281 | if (nargs < coding_arg_ccl_max) |
| 7282 | goto short_args; |
| 7283 | |
| 7284 | val = args[coding_arg_ccl_decoder]; |
| 7285 | CHECK_CCL_PROGRAM (val); |
| 7286 | if (VECTORP (val)) |
| 7287 | val = Fcopy_sequence (val); |
| 7288 | ASET (attrs, coding_attr_ccl_decoder, val); |
| 7289 | |
| 7290 | val = args[coding_arg_ccl_encoder]; |
| 7291 | CHECK_CCL_PROGRAM (val); |
| 7292 | if (VECTORP (val)) |
| 7293 | val = Fcopy_sequence (val); |
| 7294 | ASET (attrs, coding_attr_ccl_encoder, val); |
| 7295 | |
| 7296 | val = args[coding_arg_ccl_valids]; |
| 7297 | valids = Fmake_string (make_number (256), make_number (0)); |
| 7298 | for (tail = val; !NILP (tail); tail = Fcdr (tail)) |
| 7299 | { |
| 7300 | val = Fcar (tail); |
| 7301 | if (INTEGERP (val)) |
| 7302 | ASET (valids, XINT (val), 1); |
| 7303 | else |
| 7304 | { |
| 7305 | int from, to; |
| 7306 | |
| 7307 | CHECK_CONS (val); |
| 7308 | CHECK_NUMBER (XCAR (val)); |
| 7309 | CHECK_NUMBER (XCDR (val)); |
| 7310 | from = XINT (XCAR (val)); |
| 7311 | to = XINT (XCDR (val)); |
| 7312 | for (i = from; i <= to; i++) |
| 7313 | ASET (valids, i, 1); |
| 7314 | } |
| 7315 | } |
| 7316 | ASET (attrs, coding_attr_ccl_valids, valids); |
| 7317 | |
| 7318 | category = coding_category_ccl; |
| 7319 | } |
| 7320 | else if (EQ (coding_type, Qutf_16)) |
| 7321 | { |
| 7322 | Lisp_Object bom, endian; |
| 7323 | |
| 7324 | if (nargs < coding_arg_utf16_max) |
| 7325 | goto short_args; |
| 7326 | |
| 7327 | bom = args[coding_arg_utf16_bom]; |
| 7328 | if (! NILP (bom) && ! EQ (bom, Qt)) |
| 7329 | { |
| 7330 | CHECK_CONS (bom); |
| 7331 | CHECK_CODING_SYSTEM (XCAR (bom)); |
| 7332 | CHECK_CODING_SYSTEM (XCDR (bom)); |
| 7333 | } |
| 7334 | ASET (attrs, coding_attr_utf_16_bom, bom); |
| 7335 | |
| 7336 | endian = args[coding_arg_utf16_endian]; |
| 7337 | ASET (attrs, coding_attr_utf_16_endian, endian); |
| 7338 | |
| 7339 | category = (CONSP (bom) |
| 7340 | ? coding_category_utf_16_auto |
| 7341 | : NILP (bom) |
| 7342 | ? (NILP (endian) |
| 7343 | ? coding_category_utf_16_be_nosig |
| 7344 | : coding_category_utf_16_le_nosig) |
| 7345 | : (NILP (endian) |
| 7346 | ? coding_category_utf_16_be |
| 7347 | : coding_category_utf_16_le)); |
| 7348 | } |
| 7349 | else if (EQ (coding_type, Qiso_2022)) |
| 7350 | { |
| 7351 | Lisp_Object initial, reg_usage, request, flags; |
| 7352 | struct charset *charset; |
| 7353 | int i, id; |
| 7354 | |
| 7355 | if (nargs < coding_arg_iso2022_max) |
| 7356 | goto short_args; |
| 7357 | |
| 7358 | initial = Fcopy_sequence (args[coding_arg_iso2022_initial]); |
| 7359 | CHECK_VECTOR (initial); |
| 7360 | for (i = 0; i < 4; i++) |
| 7361 | { |
| 7362 | val = Faref (initial, make_number (i)); |
| 7363 | if (! NILP (val)) |
| 7364 | { |
| 7365 | CHECK_CHARSET_GET_ID (val, id); |
| 7366 | ASET (initial, i, make_number (id)); |
| 7367 | } |
| 7368 | else |
| 7369 | ASET (initial, i, make_number (-1)); |
| 7370 | } |
| 7371 | |
| 7372 | reg_usage = args[coding_arg_iso2022_reg_usage]; |
| 7373 | CHECK_CONS (reg_usage); |
| 7374 | CHECK_NATNUM (XCAR (reg_usage)); |
| 7375 | CHECK_NATNUM (XCDR (reg_usage)); |
| 7376 | |
| 7377 | request = Fcopy_sequence (args[coding_arg_iso2022_request]); |
| 7378 | for (tail = request; ! NILP (tail); tail = Fcdr (tail)) |
| 7379 | { |
| 7380 | int id; |
| 7381 | |
| 7382 | val = Fcar (tail); |
| 7383 | CHECK_CONS (val); |
| 7384 | CHECK_CHARSET_GET_ID (XCAR (val), id); |
| 7385 | CHECK_NATNUM (XCDR (val)); |
| 7386 | if (XINT (XCDR (val)) >= 4) |
| 7387 | error ("Invalid graphic register number: %d", XINT (XCDR (val))); |
| 7388 | XCAR (val) = make_number (id); |
| 7389 | } |
| 7390 | |
| 7391 | flags = args[coding_arg_iso2022_flags]; |
| 7392 | CHECK_NATNUM (flags); |
| 7393 | i = XINT (flags); |
| 7394 | if (EQ (args[coding_arg_charset_list], Qiso_2022)) |
| 7395 | flags = make_number (i | CODING_ISO_FLAG_FULL_SUPPORT); |
| 7396 | |
| 7397 | ASET (attrs, coding_attr_iso_initial, initial); |
| 7398 | ASET (attrs, coding_attr_iso_usage, reg_usage); |
| 7399 | ASET (attrs, coding_attr_iso_request, request); |
| 7400 | ASET (attrs, coding_attr_iso_flags, flags); |
| 7401 | setup_iso_safe_charsets (attrs); |
| 7402 | |
| 7403 | if (i & CODING_ISO_FLAG_SEVEN_BITS) |
| 7404 | category = ((i & (CODING_ISO_FLAG_LOCKING_SHIFT |
| 7405 | | CODING_ISO_FLAG_SINGLE_SHIFT)) |
| 7406 | ? coding_category_iso_7_else |
| 7407 | : EQ (args[coding_arg_charset_list], Qiso_2022) |
| 7408 | ? coding_category_iso_7 |
| 7409 | : coding_category_iso_7_tight); |
| 7410 | else |
| 7411 | { |
| 7412 | int id = XINT (AREF (initial, 1)); |
| 7413 | |
| 7414 | category = (((i & (CODING_ISO_FLAG_LOCKING_SHIFT |
| 7415 | | CODING_ISO_FLAG_SINGLE_SHIFT)) |
| 7416 | || EQ (args[coding_arg_charset_list], Qiso_2022) |
| 7417 | || id < 0) |
| 7418 | ? coding_category_iso_8_else |
| 7419 | : (CHARSET_DIMENSION (CHARSET_FROM_ID (id)) == 1) |
| 7420 | ? coding_category_iso_8_1 |
| 7421 | : coding_category_iso_8_2); |
| 7422 | } |
| 7423 | } |
| 7424 | else if (EQ (coding_type, Qemacs_mule)) |
| 7425 | { |
| 7426 | if (EQ (args[coding_arg_charset_list], Qemacs_mule)) |
| 7427 | ASET (attrs, coding_attr_emacs_mule_full, Qt); |
| 7428 | |
| 7429 | category = coding_category_emacs_mule; |
| 7430 | } |
| 7431 | else if (EQ (coding_type, Qshift_jis)) |
| 7432 | { |
| 7433 | |
| 7434 | struct charset *charset; |
| 7435 | |
| 7436 | if (XINT (Flength (charset_list)) != 3) |
| 7437 | error ("There should be just three charsets"); |
| 7438 | |
| 7439 | charset = CHARSET_FROM_ID (XINT (XCAR (charset_list))); |
| 7440 | if (CHARSET_DIMENSION (charset) != 1) |
| 7441 | error ("Dimension of charset %s is not one", |
| 7442 | XSYMBOL (CHARSET_NAME (charset))->name->data); |
| 7443 | |
| 7444 | charset_list = XCDR (charset_list); |
| 7445 | charset = CHARSET_FROM_ID (XINT (XCAR (charset_list))); |
| 7446 | if (CHARSET_DIMENSION (charset) != 1) |
| 7447 | error ("Dimension of charset %s is not one", |
| 7448 | XSYMBOL (CHARSET_NAME (charset))->name->data); |
| 7449 | |
| 7450 | charset_list = XCDR (charset_list); |
| 7451 | charset = CHARSET_FROM_ID (XINT (XCAR (charset_list))); |
| 7452 | if (CHARSET_DIMENSION (charset) != 2) |
| 7453 | error ("Dimension of charset %s is not two", |
| 7454 | XSYMBOL (CHARSET_NAME (charset))->name->data); |
| 7455 | |
| 7456 | category = coding_category_sjis; |
| 7457 | Vsjis_coding_system = name; |
| 7458 | } |
| 7459 | else if (EQ (coding_type, Qbig5)) |
| 7460 | { |
| 7461 | struct charset *charset; |
| 7462 | |
| 7463 | if (XINT (Flength (charset_list)) != 2) |
| 7464 | error ("There should be just two charsets"); |
| 7465 | |
| 7466 | charset = CHARSET_FROM_ID (XINT (XCAR (charset_list))); |
| 7467 | if (CHARSET_DIMENSION (charset) != 1) |
| 7468 | error ("Dimension of charset %s is not one", |
| 7469 | XSYMBOL (CHARSET_NAME (charset))->name->data); |
| 7470 | |
| 7471 | charset_list = XCDR (charset_list); |
| 7472 | charset = CHARSET_FROM_ID (XINT (XCAR (charset_list))); |
| 7473 | if (CHARSET_DIMENSION (charset) != 2) |
| 7474 | error ("Dimension of charset %s is not two", |
| 7475 | XSYMBOL (CHARSET_NAME (charset))->name->data); |
| 7476 | |
| 7477 | category = coding_category_big5; |
| 7478 | Vbig5_coding_system = name; |
| 7479 | } |
| 7480 | else if (EQ (coding_type, Qraw_text)) |
| 7481 | category = coding_category_raw_text; |
| 7482 | else if (EQ (coding_type, Qutf_8)) |
| 7483 | category = coding_category_utf_8; |
| 7484 | else if (EQ (coding_type, Qundecided)) |
| 7485 | category = coding_category_undecided; |
| 7486 | else |
| 7487 | error ("Invalid coding system type: %s", |
| 7488 | XSYMBOL (coding_type)->name->data); |
| 7489 | |
| 7490 | CODING_ATTR_CATEGORY (attrs) = make_number (category); |
| 7491 | |
| 7492 | eol_type = args[coding_arg_eol_type]; |
| 7493 | if (! NILP (eol_type) |
| 7494 | && ! EQ (eol_type, Qunix) |
| 7495 | && ! EQ (eol_type, Qdos) |
| 7496 | && ! EQ (eol_type, Qmac)) |
| 7497 | error ("Invalid eol-type"); |
| 7498 | |
| 7499 | aliases = Fcons (name, Qnil); |
| 7500 | |
| 7501 | if (NILP (eol_type)) |
| 7502 | { |
| 7503 | eol_type = make_subsidiaries (name); |
| 7504 | for (i = 0; i < 3; i++) |
| 7505 | { |
| 7506 | Lisp_Object this_spec, this_name, this_aliases, this_eol_type; |
| 7507 | |
| 7508 | this_name = AREF (eol_type, i); |
| 7509 | this_aliases = Fcons (this_name, Qnil); |
| 7510 | this_eol_type = (i == 0 ? Qunix : i == 1 ? Qdos : Qmac); |
| 7511 | this_spec = Fmake_vector (make_number (3), attrs); |
| 7512 | ASET (this_spec, 1, this_aliases); |
| 7513 | ASET (this_spec, 2, this_eol_type); |
| 7514 | Fputhash (this_name, this_spec, Vcoding_system_hash_table); |
| 7515 | Vcoding_system_list = Fcons (this_name, Vcoding_system_list); |
| 7516 | Vcoding_system_alist = Fcons (Fcons (Fsymbol_name (this_name), Qnil), |
| 7517 | Vcoding_system_alist); |
| 7518 | } |
| 7519 | } |
| 7520 | |
| 7521 | spec_vec = Fmake_vector (make_number (3), attrs); |
| 7522 | ASET (spec_vec, 1, aliases); |
| 7523 | ASET (spec_vec, 2, eol_type); |
| 7524 | |
| 7525 | Fputhash (name, spec_vec, Vcoding_system_hash_table); |
| 7526 | Vcoding_system_list = Fcons (name, Vcoding_system_list); |
| 7527 | Vcoding_system_alist = Fcons (Fcons (Fsymbol_name (name), Qnil), |
| 7528 | Vcoding_system_alist); |
| 7529 | |
| 7530 | { |
| 7531 | int id = coding_categories[category].id; |
| 7532 | |
| 7533 | if (id < 0 || EQ (name, CODING_ID_NAME (id))) |
| 7534 | setup_coding_system (name, &coding_categories[category]); |
| 7535 | } |
| 7536 | |
| 7537 | return Qnil; |
| 7538 | |
| 7539 | short_args: |
| 7540 | return Fsignal (Qwrong_number_of_arguments, |
| 7541 | Fcons (intern ("define-coding-system-internal"), |
| 7542 | make_number (nargs))); |
| 7543 | } |
| 7544 | |
| 7545 | DEFUN ("define-coding-system-alias", Fdefine_coding_system_alias, |
| 7546 | Sdefine_coding_system_alias, 2, 2, 0, |
| 7547 | doc: /* Define ALIAS as an alias for CODING-SYSTEM. */) |
| 7548 | (alias, coding_system) |
| 7549 | Lisp_Object alias, coding_system; |
| 7550 | { |
| 7551 | Lisp_Object spec, aliases, eol_type; |
| 7552 | |
| 7553 | CHECK_SYMBOL (alias); |
| 7554 | CHECK_CODING_SYSTEM_GET_SPEC (coding_system, spec); |
| 7555 | aliases = AREF (spec, 1); |
| 7556 | while (!NILP (XCDR (aliases))) |
| 7557 | aliases = XCDR (aliases); |
| 7558 | XCDR (aliases) = Fcons (alias, Qnil); |
| 7559 | |
| 7560 | eol_type = AREF (spec, 2); |
| 7561 | if (VECTORP (eol_type)) |
| 7562 | { |
| 7563 | Lisp_Object subsidiaries; |
| 7564 | int i; |
| 7565 | |
| 7566 | subsidiaries = make_subsidiaries (alias); |
| 7567 | for (i = 0; i < 3; i++) |
| 7568 | Fdefine_coding_system_alias (AREF (subsidiaries, i), |
| 7569 | AREF (eol_type, i)); |
| 7570 | |
| 7571 | ASET (spec, 2, subsidiaries); |
| 7572 | } |
| 7573 | |
| 7574 | Fputhash (alias, spec, Vcoding_system_hash_table); |
| 7575 | |
| 7576 | return Qnil; |
| 7577 | } |
| 7578 | |
| 7579 | DEFUN ("coding-system-base", Fcoding_system_base, Scoding_system_base, |
| 7580 | 1, 1, 0, |
| 7581 | doc: /* Return the base of CODING-SYSTEM. |
| 7582 | Any alias or subsidiary coding systems are not base coding system. */) |
| 7583 | (coding_system) |
| 7584 | Lisp_Object coding_system; |
| 7585 | { |
| 7586 | Lisp_Object spec, attrs; |
| 7587 | |
| 7588 | if (NILP (coding_system)) |
| 7589 | return (Qno_conversion); |
| 7590 | CHECK_CODING_SYSTEM_GET_SPEC (coding_system, spec); |
| 7591 | attrs = AREF (spec, 0); |
| 7592 | return CODING_ATTR_BASE_NAME (attrs); |
| 7593 | } |
| 7594 | |
| 7595 | DEFUN ("coding-system-plist", Fcoding_system_plist, Scoding_system_plist, |
| 7596 | 1, 1, 0, |
| 7597 | doc: "Return the property list of CODING-SYSTEM.") |
| 7598 | (coding_system) |
| 7599 | Lisp_Object coding_system; |
| 7600 | { |
| 7601 | Lisp_Object spec, attrs; |
| 7602 | |
| 7603 | if (NILP (coding_system)) |
| 7604 | coding_system = Qno_conversion; |
| 7605 | CHECK_CODING_SYSTEM_GET_SPEC (coding_system, spec); |
| 7606 | attrs = AREF (spec, 0); |
| 7607 | return CODING_ATTR_PLIST (attrs); |
| 7608 | } |
| 7609 | |
| 7610 | |
| 7611 | DEFUN ("coding-system-aliases", Fcoding_system_aliases, Scoding_system_aliases, |
| 7612 | 1, 1, 0, |
| 7613 | doc: /* Return the list of aliases of CODING-SYSTEM. |
| 7614 | A base coding system is what made by `define-coding-system'. |
| 7615 | Any alias nor subsidiary coding systems are not base coding system. */) |
| 7616 | (coding_system) |
| 7617 | Lisp_Object coding_system; |
| 7618 | { |
| 7619 | Lisp_Object spec; |
| 7620 | |
| 7621 | if (NILP (coding_system)) |
| 7622 | coding_system = Qno_conversion; |
| 7623 | CHECK_CODING_SYSTEM_GET_SPEC (coding_system, spec); |
| 7624 | return AREF (spec, 2); |
| 7625 | } |
| 7626 | |
| 7627 | DEFUN ("coding-system-eol-type", Fcoding_system_eol_type, |
| 7628 | Scoding_system_eol_type, 1, 1, 0, |
| 7629 | doc: /* Return eol-type of CODING-SYSTEM. |
| 7630 | An eol-type is integer 0, 1, 2, or a vector of coding systems. |
| 7631 | |
| 7632 | Integer values 0, 1, and 2 indicate a format of end-of-line; LF, CRLF, |
| 7633 | and CR respectively. |
| 7634 | |
| 7635 | A vector value indicates that a format of end-of-line should be |
| 7636 | detected automatically. Nth element of the vector is the subsidiary |
| 7637 | coding system whose eol-type is N. */) |
| 7638 | (coding_system) |
| 7639 | Lisp_Object coding_system; |
| 7640 | { |
| 7641 | Lisp_Object spec, eol_type; |
| 7642 | int n; |
| 7643 | |
| 7644 | if (NILP (coding_system)) |
| 7645 | coding_system = Qno_conversion; |
| 7646 | if (! CODING_SYSTEM_P (coding_system)) |
| 7647 | return Qnil; |
| 7648 | spec = CODING_SYSTEM_SPEC (coding_system); |
| 7649 | eol_type = AREF (spec, 2); |
| 7650 | if (VECTORP (eol_type)) |
| 7651 | return Fcopy_sequence (eol_type); |
| 7652 | n = EQ (eol_type, Qunix) ? 0 : EQ (eol_type, Qdos) ? 1 : 2; |
| 7653 | return make_number (n); |
| 7654 | } |
| 7655 | |
| 7656 | #endif /* emacs */ |
| 7657 | |
| 7658 | \f |
| 7659 | /*** 9. Post-amble ***/ |
| 7660 | |
| 7661 | void |
| 7662 | init_coding_once () |
| 7663 | { |
| 7664 | int i; |
| 7665 | |
| 7666 | for (i = 0; i < coding_category_max; i++) |
| 7667 | { |
| 7668 | coding_categories[i].id = -1; |
| 7669 | coding_priorities[i] = i; |
| 7670 | } |
| 7671 | |
| 7672 | /* ISO2022 specific initialize routine. */ |
| 7673 | for (i = 0; i < 0x20; i++) |
| 7674 | iso_code_class[i] = ISO_control_0; |
| 7675 | for (i = 0x21; i < 0x7F; i++) |
| 7676 | iso_code_class[i] = ISO_graphic_plane_0; |
| 7677 | for (i = 0x80; i < 0xA0; i++) |
| 7678 | iso_code_class[i] = ISO_control_1; |
| 7679 | for (i = 0xA1; i < 0xFF; i++) |
| 7680 | iso_code_class[i] = ISO_graphic_plane_1; |
| 7681 | iso_code_class[0x20] = iso_code_class[0x7F] = ISO_0x20_or_0x7F; |
| 7682 | iso_code_class[0xA0] = iso_code_class[0xFF] = ISO_0xA0_or_0xFF; |
| 7683 | iso_code_class[ISO_CODE_CR] = ISO_carriage_return; |
| 7684 | iso_code_class[ISO_CODE_SO] = ISO_shift_out; |
| 7685 | iso_code_class[ISO_CODE_SI] = ISO_shift_in; |
| 7686 | iso_code_class[ISO_CODE_SS2_7] = ISO_single_shift_2_7; |
| 7687 | iso_code_class[ISO_CODE_ESC] = ISO_escape; |
| 7688 | iso_code_class[ISO_CODE_SS2] = ISO_single_shift_2; |
| 7689 | iso_code_class[ISO_CODE_SS3] = ISO_single_shift_3; |
| 7690 | iso_code_class[ISO_CODE_CSI] = ISO_control_sequence_introducer; |
| 7691 | |
| 7692 | inhibit_pre_post_conversion = 0; |
| 7693 | |
| 7694 | for (i = 0; i < 256; i++) |
| 7695 | { |
| 7696 | emacs_mule_bytes[i] = 1; |
| 7697 | } |
| 7698 | } |
| 7699 | |
| 7700 | #ifdef emacs |
| 7701 | |
| 7702 | void |
| 7703 | syms_of_coding () |
| 7704 | { |
| 7705 | staticpro (&Vcoding_system_hash_table); |
| 7706 | Vcoding_system_hash_table = Fmakehash (Qeq); |
| 7707 | |
| 7708 | staticpro (&Vsjis_coding_system); |
| 7709 | Vsjis_coding_system = Qnil; |
| 7710 | |
| 7711 | staticpro (&Vbig5_coding_system); |
| 7712 | Vbig5_coding_system = Qnil; |
| 7713 | |
| 7714 | staticpro (&Vcode_conversion_work_buf_list); |
| 7715 | Vcode_conversion_work_buf_list = Qnil; |
| 7716 | |
| 7717 | staticpro (&Vcode_conversion_reused_work_buf); |
| 7718 | Vcode_conversion_reused_work_buf = Qnil; |
| 7719 | |
| 7720 | DEFSYM (Qcharset, "charset"); |
| 7721 | DEFSYM (Qtarget_idx, "target-idx"); |
| 7722 | DEFSYM (Qcoding_system_history, "coding-system-history"); |
| 7723 | Fset (Qcoding_system_history, Qnil); |
| 7724 | |
| 7725 | /* Target FILENAME is the first argument. */ |
| 7726 | Fput (Qinsert_file_contents, Qtarget_idx, make_number (0)); |
| 7727 | /* Target FILENAME is the third argument. */ |
| 7728 | Fput (Qwrite_region, Qtarget_idx, make_number (2)); |
| 7729 | |
| 7730 | DEFSYM (Qcall_process, "call-process"); |
| 7731 | /* Target PROGRAM is the first argument. */ |
| 7732 | Fput (Qcall_process, Qtarget_idx, make_number (0)); |
| 7733 | |
| 7734 | DEFSYM (Qcall_process_region, "call-process-region"); |
| 7735 | /* Target PROGRAM is the third argument. */ |
| 7736 | Fput (Qcall_process_region, Qtarget_idx, make_number (2)); |
| 7737 | |
| 7738 | DEFSYM (Qstart_process, "start-process"); |
| 7739 | /* Target PROGRAM is the third argument. */ |
| 7740 | Fput (Qstart_process, Qtarget_idx, make_number (2)); |
| 7741 | |
| 7742 | DEFSYM (Qopen_network_stream, "open-network-stream"); |
| 7743 | /* Target SERVICE is the fourth argument. */ |
| 7744 | Fput (Qopen_network_stream, Qtarget_idx, make_number (3)); |
| 7745 | |
| 7746 | DEFSYM (Qcoding_system, "coding-system"); |
| 7747 | DEFSYM (Qcoding_aliases, "coding-aliases"); |
| 7748 | |
| 7749 | DEFSYM (Qeol_type, "eol-type"); |
| 7750 | DEFSYM (Qunix, "unix"); |
| 7751 | DEFSYM (Qdos, "dos"); |
| 7752 | DEFSYM (Qmac, "mac"); |
| 7753 | |
| 7754 | DEFSYM (Qbuffer_file_coding_system, "buffer-file-coding-system"); |
| 7755 | DEFSYM (Qpost_read_conversion, "post-read-conversion"); |
| 7756 | DEFSYM (Qpre_write_conversion, "pre-write-conversion"); |
| 7757 | DEFSYM (Qdefault_char, "default-char"); |
| 7758 | DEFSYM (Qundecided, "undecided"); |
| 7759 | DEFSYM (Qno_conversion, "no-conversion"); |
| 7760 | DEFSYM (Qraw_text, "raw-text"); |
| 7761 | |
| 7762 | DEFSYM (Qiso_2022, "iso-2022"); |
| 7763 | |
| 7764 | DEFSYM (Qutf_8, "utf-8"); |
| 7765 | |
| 7766 | DEFSYM (Qutf_16, "utf-16"); |
| 7767 | DEFSYM (Qutf_16_be, "utf-16-be"); |
| 7768 | DEFSYM (Qutf_16_be_nosig, "utf-16-be-nosig"); |
| 7769 | DEFSYM (Qutf_16_le, "utf-16-l3"); |
| 7770 | DEFSYM (Qutf_16_le_nosig, "utf-16-le-nosig"); |
| 7771 | DEFSYM (Qsignature, "signature"); |
| 7772 | DEFSYM (Qendian, "endian"); |
| 7773 | DEFSYM (Qbig, "big"); |
| 7774 | DEFSYM (Qlittle, "little"); |
| 7775 | |
| 7776 | DEFSYM (Qshift_jis, "shift-jis"); |
| 7777 | DEFSYM (Qbig5, "big5"); |
| 7778 | |
| 7779 | DEFSYM (Qcoding_system_p, "coding-system-p"); |
| 7780 | |
| 7781 | DEFSYM (Qcoding_system_error, "coding-system-error"); |
| 7782 | Fput (Qcoding_system_error, Qerror_conditions, |
| 7783 | Fcons (Qcoding_system_error, Fcons (Qerror, Qnil))); |
| 7784 | Fput (Qcoding_system_error, Qerror_message, |
| 7785 | build_string ("Invalid coding system")); |
| 7786 | |
| 7787 | /* Intern this now in case it isn't already done. |
| 7788 | Setting this variable twice is harmless. |
| 7789 | But don't staticpro it here--that is done in alloc.c. */ |
| 7790 | Qchar_table_extra_slots = intern ("char-table-extra-slots"); |
| 7791 | |
| 7792 | DEFSYM (Qtranslation_table, "translation-table"); |
| 7793 | Fput (Qtranslation_table, Qchar_table_extra_slots, make_number (1)); |
| 7794 | DEFSYM (Qtranslation_table_id, "translation-table-id"); |
| 7795 | DEFSYM (Qtranslation_table_for_decode, "translation-table-for-decode"); |
| 7796 | DEFSYM (Qtranslation_table_for_encode, "translation-table-for-encode"); |
| 7797 | |
| 7798 | DEFSYM (Qchar_coding_system, "char-coding-system"); |
| 7799 | |
| 7800 | Fput (Qchar_coding_system, Qchar_table_extra_slots, make_number (2)); |
| 7801 | |
| 7802 | DEFSYM (Qvalid_codes, "valid-codes"); |
| 7803 | |
| 7804 | DEFSYM (Qemacs_mule, "emacs-mule"); |
| 7805 | |
| 7806 | Vcoding_category_table |
| 7807 | = Fmake_vector (make_number (coding_category_max), Qnil); |
| 7808 | staticpro (&Vcoding_category_table); |
| 7809 | /* Followings are target of code detection. */ |
| 7810 | ASET (Vcoding_category_table, coding_category_iso_7, |
| 7811 | intern ("coding-category-iso-7")); |
| 7812 | ASET (Vcoding_category_table, coding_category_iso_7_tight, |
| 7813 | intern ("coding-category-iso-7-tight")); |
| 7814 | ASET (Vcoding_category_table, coding_category_iso_8_1, |
| 7815 | intern ("coding-category-iso-8-1")); |
| 7816 | ASET (Vcoding_category_table, coding_category_iso_8_2, |
| 7817 | intern ("coding-category-iso-8-2")); |
| 7818 | ASET (Vcoding_category_table, coding_category_iso_7_else, |
| 7819 | intern ("coding-category-iso-7-else")); |
| 7820 | ASET (Vcoding_category_table, coding_category_iso_8_else, |
| 7821 | intern ("coding-category-iso-8-else")); |
| 7822 | ASET (Vcoding_category_table, coding_category_utf_8, |
| 7823 | intern ("coding-category-utf-8")); |
| 7824 | ASET (Vcoding_category_table, coding_category_utf_16_be, |
| 7825 | intern ("coding-category-utf-16-be")); |
| 7826 | ASET (Vcoding_category_table, coding_category_utf_16_le, |
| 7827 | intern ("coding-category-utf-16-le")); |
| 7828 | ASET (Vcoding_category_table, coding_category_utf_16_be_nosig, |
| 7829 | intern ("coding-category-utf-16-be-nosig")); |
| 7830 | ASET (Vcoding_category_table, coding_category_utf_16_le_nosig, |
| 7831 | intern ("coding-category-utf-16-le-nosig")); |
| 7832 | ASET (Vcoding_category_table, coding_category_charset, |
| 7833 | intern ("coding-category-charset")); |
| 7834 | ASET (Vcoding_category_table, coding_category_sjis, |
| 7835 | intern ("coding-category-sjis")); |
| 7836 | ASET (Vcoding_category_table, coding_category_big5, |
| 7837 | intern ("coding-category-big5")); |
| 7838 | ASET (Vcoding_category_table, coding_category_ccl, |
| 7839 | intern ("coding-category-ccl")); |
| 7840 | ASET (Vcoding_category_table, coding_category_emacs_mule, |
| 7841 | intern ("coding-category-emacs-mule")); |
| 7842 | /* Followings are NOT target of code detection. */ |
| 7843 | ASET (Vcoding_category_table, coding_category_raw_text, |
| 7844 | intern ("coding-category-raw-text")); |
| 7845 | ASET (Vcoding_category_table, coding_category_undecided, |
| 7846 | intern ("coding-category-undecided")); |
| 7847 | |
| 7848 | { |
| 7849 | Lisp_Object args[coding_arg_max]; |
| 7850 | Lisp_Object plist[14]; |
| 7851 | int i; |
| 7852 | |
| 7853 | for (i = 0; i < coding_arg_max; i++) |
| 7854 | args[i] = Qnil; |
| 7855 | |
| 7856 | plist[0] = intern (":name"); |
| 7857 | plist[1] = args[coding_arg_name] = Qno_conversion; |
| 7858 | plist[2] = intern (":mnemonic"); |
| 7859 | plist[3] = args[coding_arg_mnemonic] = make_number ('='); |
| 7860 | plist[4] = intern (":coding-type"); |
| 7861 | plist[5] = args[coding_arg_coding_type] = Qraw_text; |
| 7862 | plist[6] = intern (":ascii-compatible-p"); |
| 7863 | plist[7] = args[coding_arg_ascii_compatible_p] = Qt; |
| 7864 | plist[8] = intern (":default-char"); |
| 7865 | plist[9] = args[coding_arg_default_char] = make_number (0); |
| 7866 | plist[10] = intern (":docstring"); |
| 7867 | plist[11] = build_string ("Do no conversion.\n\ |
| 7868 | \n\ |
| 7869 | When you visit a file with this coding, the file is read into a\n\ |
| 7870 | unibyte buffer as is, thus each byte of a file is treated as a\n\ |
| 7871 | character."); |
| 7872 | plist[12] = intern (":eol-type"); |
| 7873 | plist[13] = args[coding_arg_eol_type] = Qunix; |
| 7874 | args[coding_arg_plist] = Flist (14, plist); |
| 7875 | Fdefine_coding_system_internal (coding_arg_max, args); |
| 7876 | } |
| 7877 | |
| 7878 | setup_coding_system (Qno_conversion, &keyboard_coding); |
| 7879 | setup_coding_system (Qno_conversion, &terminal_coding); |
| 7880 | setup_coding_system (Qno_conversion, &safe_terminal_coding); |
| 7881 | |
| 7882 | defsubr (&Scoding_system_p); |
| 7883 | defsubr (&Sread_coding_system); |
| 7884 | defsubr (&Sread_non_nil_coding_system); |
| 7885 | defsubr (&Scheck_coding_system); |
| 7886 | defsubr (&Sdetect_coding_region); |
| 7887 | defsubr (&Sdetect_coding_string); |
| 7888 | defsubr (&Sfind_coding_systems_region_internal); |
| 7889 | defsubr (&Scheck_coding_systems_region); |
| 7890 | defsubr (&Sdecode_coding_region); |
| 7891 | defsubr (&Sencode_coding_region); |
| 7892 | defsubr (&Sdecode_coding_string); |
| 7893 | defsubr (&Sencode_coding_string); |
| 7894 | defsubr (&Sdecode_sjis_char); |
| 7895 | defsubr (&Sencode_sjis_char); |
| 7896 | defsubr (&Sdecode_big5_char); |
| 7897 | defsubr (&Sencode_big5_char); |
| 7898 | defsubr (&Sset_terminal_coding_system_internal); |
| 7899 | defsubr (&Sset_safe_terminal_coding_system_internal); |
| 7900 | defsubr (&Sterminal_coding_system); |
| 7901 | defsubr (&Sset_keyboard_coding_system_internal); |
| 7902 | defsubr (&Skeyboard_coding_system); |
| 7903 | defsubr (&Sfind_operation_coding_system); |
| 7904 | defsubr (&Sset_coding_system_priority); |
| 7905 | defsubr (&Sdefine_coding_system_internal); |
| 7906 | defsubr (&Sdefine_coding_system_alias); |
| 7907 | defsubr (&Scoding_system_base); |
| 7908 | defsubr (&Scoding_system_plist); |
| 7909 | defsubr (&Scoding_system_aliases); |
| 7910 | defsubr (&Scoding_system_eol_type); |
| 7911 | defsubr (&Scoding_system_priority_list); |
| 7912 | |
| 7913 | DEFVAR_LISP ("coding-system-list", &Vcoding_system_list, |
| 7914 | doc: /* List of coding systems. |
| 7915 | |
| 7916 | Do not alter the value of this variable manually. This variable should be |
| 7917 | updated by the functions `define-coding-system' and |
| 7918 | `define-coding-system-alias'. */); |
| 7919 | Vcoding_system_list = Qnil; |
| 7920 | |
| 7921 | DEFVAR_LISP ("coding-system-alist", &Vcoding_system_alist, |
| 7922 | doc: /* Alist of coding system names. |
| 7923 | Each element is one element list of coding system name. |
| 7924 | This variable is given to `completing-read' as TABLE argument. |
| 7925 | |
| 7926 | Do not alter the value of this variable manually. This variable should be |
| 7927 | updated by the functions `make-coding-system' and |
| 7928 | `define-coding-system-alias'. */); |
| 7929 | Vcoding_system_alist = Qnil; |
| 7930 | |
| 7931 | DEFVAR_LISP ("coding-category-list", &Vcoding_category_list, |
| 7932 | doc: /* List of coding-categories (symbols) ordered by priority. |
| 7933 | |
| 7934 | On detecting a coding system, Emacs tries code detection algorithms |
| 7935 | associated with each coding-category one by one in this order. When |
| 7936 | one algorithm agrees with a byte sequence of source text, the coding |
| 7937 | system bound to the corresponding coding-category is selected. */); |
| 7938 | { |
| 7939 | int i; |
| 7940 | |
| 7941 | Vcoding_category_list = Qnil; |
| 7942 | for (i = coding_category_max - 1; i >= 0; i--) |
| 7943 | Vcoding_category_list |
| 7944 | = Fcons (XVECTOR (Vcoding_category_table)->contents[i], |
| 7945 | Vcoding_category_list); |
| 7946 | } |
| 7947 | |
| 7948 | DEFVAR_LISP ("coding-system-for-read", &Vcoding_system_for_read, |
| 7949 | doc: /* Specify the coding system for read operations. |
| 7950 | It is useful to bind this variable with `let', but do not set it globally. |
| 7951 | If the value is a coding system, it is used for decoding on read operation. |
| 7952 | If not, an appropriate element is used from one of the coding system alists: |
| 7953 | There are three such tables, `file-coding-system-alist', |
| 7954 | `process-coding-system-alist', and `network-coding-system-alist'. */); |
| 7955 | Vcoding_system_for_read = Qnil; |
| 7956 | |
| 7957 | DEFVAR_LISP ("coding-system-for-write", &Vcoding_system_for_write, |
| 7958 | doc: /* Specify the coding system for write operations. |
| 7959 | Programs bind this variable with `let', but you should not set it globally. |
| 7960 | If the value is a coding system, it is used for encoding of output, |
| 7961 | when writing it to a file and when sending it to a file or subprocess. |
| 7962 | |
| 7963 | If this does not specify a coding system, an appropriate element |
| 7964 | is used from one of the coding system alists: |
| 7965 | There are three such tables, `file-coding-system-alist', |
| 7966 | `process-coding-system-alist', and `network-coding-system-alist'. |
| 7967 | For output to files, if the above procedure does not specify a coding system, |
| 7968 | the value of `buffer-file-coding-system' is used. */); |
| 7969 | Vcoding_system_for_write = Qnil; |
| 7970 | |
| 7971 | DEFVAR_LISP ("last-coding-system-used", &Vlast_coding_system_used, |
| 7972 | doc: /* |
| 7973 | Coding system used in the latest file or process I/O. */); |
| 7974 | Vlast_coding_system_used = Qnil; |
| 7975 | |
| 7976 | DEFVAR_BOOL ("inhibit-eol-conversion", &inhibit_eol_conversion, |
| 7977 | doc: /* |
| 7978 | *Non-nil means always inhibit code conversion of end-of-line format. |
| 7979 | See info node `Coding Systems' and info node `Text and Binary' concerning |
| 7980 | such conversion. */); |
| 7981 | inhibit_eol_conversion = 0; |
| 7982 | |
| 7983 | DEFVAR_BOOL ("inherit-process-coding-system", &inherit_process_coding_system, |
| 7984 | doc: /* |
| 7985 | Non-nil means process buffer inherits coding system of process output. |
| 7986 | Bind it to t if the process output is to be treated as if it were a file |
| 7987 | read from some filesystem. */); |
| 7988 | inherit_process_coding_system = 0; |
| 7989 | |
| 7990 | DEFVAR_LISP ("file-coding-system-alist", &Vfile_coding_system_alist, |
| 7991 | doc: /* |
| 7992 | Alist to decide a coding system to use for a file I/O operation. |
| 7993 | The format is ((PATTERN . VAL) ...), |
| 7994 | where PATTERN is a regular expression matching a file name, |
| 7995 | VAL is a coding system, a cons of coding systems, or a function symbol. |
| 7996 | If VAL is a coding system, it is used for both decoding and encoding |
| 7997 | the file contents. |
| 7998 | If VAL is a cons of coding systems, the car part is used for decoding, |
| 7999 | and the cdr part is used for encoding. |
| 8000 | If VAL is a function symbol, the function must return a coding system |
| 8001 | or a cons of coding systems which are used as above. The function gets |
| 8002 | the arguments with which `find-operation-coding-systems' was called. |
| 8003 | |
| 8004 | See also the function `find-operation-coding-system' |
| 8005 | and the variable `auto-coding-alist'. */); |
| 8006 | Vfile_coding_system_alist = Qnil; |
| 8007 | |
| 8008 | DEFVAR_LISP ("process-coding-system-alist", &Vprocess_coding_system_alist, |
| 8009 | doc: /* |
| 8010 | Alist to decide a coding system to use for a process I/O operation. |
| 8011 | The format is ((PATTERN . VAL) ...), |
| 8012 | where PATTERN is a regular expression matching a program name, |
| 8013 | VAL is a coding system, a cons of coding systems, or a function symbol. |
| 8014 | If VAL is a coding system, it is used for both decoding what received |
| 8015 | from the program and encoding what sent to the program. |
| 8016 | If VAL is a cons of coding systems, the car part is used for decoding, |
| 8017 | and the cdr part is used for encoding. |
| 8018 | If VAL is a function symbol, the function must return a coding system |
| 8019 | or a cons of coding systems which are used as above. |
| 8020 | |
| 8021 | See also the function `find-operation-coding-system'. */); |
| 8022 | Vprocess_coding_system_alist = Qnil; |
| 8023 | |
| 8024 | DEFVAR_LISP ("network-coding-system-alist", &Vnetwork_coding_system_alist, |
| 8025 | doc: /* |
| 8026 | Alist to decide a coding system to use for a network I/O operation. |
| 8027 | The format is ((PATTERN . VAL) ...), |
| 8028 | where PATTERN is a regular expression matching a network service name |
| 8029 | or is a port number to connect to, |
| 8030 | VAL is a coding system, a cons of coding systems, or a function symbol. |
| 8031 | If VAL is a coding system, it is used for both decoding what received |
| 8032 | from the network stream and encoding what sent to the network stream. |
| 8033 | If VAL is a cons of coding systems, the car part is used for decoding, |
| 8034 | and the cdr part is used for encoding. |
| 8035 | If VAL is a function symbol, the function must return a coding system |
| 8036 | or a cons of coding systems which are used as above. |
| 8037 | |
| 8038 | See also the function `find-operation-coding-system'. */); |
| 8039 | Vnetwork_coding_system_alist = Qnil; |
| 8040 | |
| 8041 | DEFVAR_LISP ("locale-coding-system", &Vlocale_coding_system, |
| 8042 | doc: /* Coding system to use with system messages. |
| 8043 | Also used for decoding keyboard input on X Window system. */); |
| 8044 | Vlocale_coding_system = Qnil; |
| 8045 | |
| 8046 | /* The eol mnemonics are reset in startup.el system-dependently. */ |
| 8047 | DEFVAR_LISP ("eol-mnemonic-unix", &eol_mnemonic_unix, |
| 8048 | doc: /* |
| 8049 | *String displayed in mode line for UNIX-like (LF) end-of-line format. */); |
| 8050 | eol_mnemonic_unix = build_string (":"); |
| 8051 | |
| 8052 | DEFVAR_LISP ("eol-mnemonic-dos", &eol_mnemonic_dos, |
| 8053 | doc: /* |
| 8054 | *String displayed in mode line for DOS-like (CRLF) end-of-line format. */); |
| 8055 | eol_mnemonic_dos = build_string ("\\"); |
| 8056 | |
| 8057 | DEFVAR_LISP ("eol-mnemonic-mac", &eol_mnemonic_mac, |
| 8058 | doc: /* |
| 8059 | *String displayed in mode line for MAC-like (CR) end-of-line format. */); |
| 8060 | eol_mnemonic_mac = build_string ("/"); |
| 8061 | |
| 8062 | DEFVAR_LISP ("eol-mnemonic-undecided", &eol_mnemonic_undecided, |
| 8063 | doc: /* |
| 8064 | *String displayed in mode line when end-of-line format is not yet determined. */); |
| 8065 | eol_mnemonic_undecided = build_string (":"); |
| 8066 | |
| 8067 | DEFVAR_LISP ("enable-character-translation", &Venable_character_translation, |
| 8068 | doc: /* |
| 8069 | *Non-nil enables character translation while encoding and decoding. */); |
| 8070 | Venable_character_translation = Qt; |
| 8071 | |
| 8072 | DEFVAR_LISP ("standard-translation-table-for-decode", |
| 8073 | &Vstandard_translation_table_for_decode, |
| 8074 | doc: /* Table for translating characters while decoding. */); |
| 8075 | Vstandard_translation_table_for_decode = Qnil; |
| 8076 | |
| 8077 | DEFVAR_LISP ("standard-translation-table-for-encode", |
| 8078 | &Vstandard_translation_table_for_encode, |
| 8079 | doc: /* Table for translating characters while encoding. */); |
| 8080 | Vstandard_translation_table_for_encode = Qnil; |
| 8081 | |
| 8082 | DEFVAR_LISP ("charset-revision-table", &Vcharset_revision_table, |
| 8083 | doc: /* Alist of charsets vs revision numbers. |
| 8084 | While encoding, if a charset (car part of an element) is found, |
| 8085 | designate it with the escape sequence identifying revision (cdr part |
| 8086 | of the element). */); |
| 8087 | Vcharset_revision_table = Qnil; |
| 8088 | |
| 8089 | DEFVAR_LISP ("default-process-coding-system", |
| 8090 | &Vdefault_process_coding_system, |
| 8091 | doc: /* Cons of coding systems used for process I/O by default. |
| 8092 | The car part is used for decoding a process output, |
| 8093 | the cdr part is used for encoding a text to be sent to a process. */); |
| 8094 | Vdefault_process_coding_system = Qnil; |
| 8095 | |
| 8096 | DEFVAR_LISP ("latin-extra-code-table", &Vlatin_extra_code_table, |
| 8097 | doc: /* |
| 8098 | Table of extra Latin codes in the range 128..159 (inclusive). |
| 8099 | This is a vector of length 256. |
| 8100 | If Nth element is non-nil, the existence of code N in a file |
| 8101 | \(or output of subprocess) doesn't prevent it to be detected as |
| 8102 | a coding system of ISO 2022 variant which has a flag |
| 8103 | `accept-latin-extra-code' t (e.g. iso-latin-1) on reading a file |
| 8104 | or reading output of a subprocess. |
| 8105 | Only 128th through 159th elements has a meaning. */); |
| 8106 | Vlatin_extra_code_table = Fmake_vector (make_number (256), Qnil); |
| 8107 | |
| 8108 | DEFVAR_LISP ("select-safe-coding-system-function", |
| 8109 | &Vselect_safe_coding_system_function, |
| 8110 | doc: /* |
| 8111 | Function to call to select safe coding system for encoding a text. |
| 8112 | |
| 8113 | If set, this function is called to force a user to select a proper |
| 8114 | coding system which can encode the text in the case that a default |
| 8115 | coding system used in each operation can't encode the text. |
| 8116 | |
| 8117 | The default value is `select-safe-coding-system' (which see). */); |
| 8118 | Vselect_safe_coding_system_function = Qnil; |
| 8119 | |
| 8120 | DEFVAR_LISP ("char-coding-system-table", &Vchar_coding_system_table, |
| 8121 | doc: /* |
| 8122 | Char-table containing safe coding systems of each characters. |
| 8123 | Each element doesn't include such generic coding systems that can |
| 8124 | encode any characters. They are in the first extra slot. */); |
| 8125 | Vchar_coding_system_table = Fmake_char_table (Qchar_coding_system, Qnil); |
| 8126 | |
| 8127 | DEFVAR_BOOL ("inhibit-iso-escape-detection", |
| 8128 | &inhibit_iso_escape_detection, |
| 8129 | doc: /* |
| 8130 | If non-nil, Emacs ignores ISO2022's escape sequence on code detection. |
| 8131 | |
| 8132 | By default, on reading a file, Emacs tries to detect how the text is |
| 8133 | encoded. This code detection is sensitive to escape sequences. If |
| 8134 | the sequence is valid as ISO2022, the code is determined as one of |
| 8135 | the ISO2022 encodings, and the file is decoded by the corresponding |
| 8136 | coding system (e.g. `iso-2022-7bit'). |
| 8137 | |
| 8138 | However, there may be a case that you want to read escape sequences in |
| 8139 | a file as is. In such a case, you can set this variable to non-nil. |
| 8140 | Then, as the code detection ignores any escape sequences, no file is |
| 8141 | detected as encoded in some ISO2022 encoding. The result is that all |
| 8142 | escape sequences become visible in a buffer. |
| 8143 | |
| 8144 | The default value is nil, and it is strongly recommended not to change |
| 8145 | it. That is because many Emacs Lisp source files that contain |
| 8146 | non-ASCII characters are encoded by the coding system `iso-2022-7bit' |
| 8147 | in Emacs's distribution, and they won't be decoded correctly on |
| 8148 | reading if you suppress escape sequence detection. |
| 8149 | |
| 8150 | The other way to read escape sequences in a file without decoding is |
| 8151 | to explicitly specify some coding system that doesn't use ISO2022's |
| 8152 | escape sequence (e.g `latin-1') on reading by \\[universal-coding-system-argument]. */); |
| 8153 | inhibit_iso_escape_detection = 0; |
| 8154 | } |
| 8155 | |
| 8156 | char * |
| 8157 | emacs_strerror (error_number) |
| 8158 | int error_number; |
| 8159 | { |
| 8160 | char *str; |
| 8161 | |
| 8162 | synchronize_system_messages_locale (); |
| 8163 | str = strerror (error_number); |
| 8164 | |
| 8165 | if (! NILP (Vlocale_coding_system)) |
| 8166 | { |
| 8167 | Lisp_Object dec = code_convert_string_norecord (build_string (str), |
| 8168 | Vlocale_coding_system, |
| 8169 | 0); |
| 8170 | str = (char *) XSTRING (dec)->data; |
| 8171 | } |
| 8172 | |
| 8173 | return str; |
| 8174 | } |
| 8175 | |
| 8176 | #endif /* emacs */ |