Commit | Line | Data |
---|---|---|
4ed46869 | 1 | /* Coding system handler (conversion, detection, and etc). |
203cb916 RS |
2 | Copyright (C) 1995, 1997 Electrotechnical Laboratory, JAPAN. |
3 | Licensed to the Free Software Foundation. | |
4ed46869 | 4 | |
369314dc KH |
5 | This file is part of GNU Emacs. |
6 | ||
7 | GNU Emacs is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2, or (at your option) | |
10 | any later version. | |
4ed46869 | 11 | |
369314dc KH |
12 | GNU Emacs is distributed in the hope that it will be useful, |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
4ed46869 | 16 | |
369314dc KH |
17 | You should have received a copy of the GNU General Public License |
18 | along with GNU Emacs; see the file COPYING. If not, write to | |
19 | the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
20 | Boston, MA 02111-1307, USA. */ | |
4ed46869 KH |
21 | |
22 | /*** TABLE OF CONTENTS *** | |
23 | ||
24 | 1. Preamble | |
0ef69138 | 25 | 2. Emacs' internal format (emacs-mule) handlers |
4ed46869 KH |
26 | 3. ISO2022 handlers |
27 | 4. Shift-JIS and BIG5 handlers | |
28 | 5. End-of-line handlers | |
29 | 6. C library functions | |
30 | 7. Emacs Lisp library functions | |
31 | 8. Post-amble | |
32 | ||
33 | */ | |
34 | ||
35 | /*** GENERAL NOTE on CODING SYSTEM *** | |
36 | ||
37 | Coding system is an encoding mechanism of one or more character | |
38 | sets. Here's a list of coding systems which Emacs can handle. When | |
39 | we say "decode", it means converting some other coding system to | |
0ef69138 KH |
40 | Emacs' internal format (emacs-internal), and when we say "encode", |
41 | it means converting the coding system emacs-mule to some other | |
42 | coding system. | |
4ed46869 | 43 | |
0ef69138 | 44 | 0. Emacs' internal format (emacs-mule) |
4ed46869 KH |
45 | |
46 | Emacs itself holds a multi-lingual character in a buffer and a string | |
f4dee582 | 47 | in a special format. Details are described in section 2. |
4ed46869 KH |
48 | |
49 | 1. ISO2022 | |
50 | ||
51 | The most famous coding system for multiple character sets. X's | |
f4dee582 RS |
52 | Compound Text, various EUCs (Extended Unix Code), and coding |
53 | systems used in Internet communication such as ISO-2022-JP are | |
54 | all variants of ISO2022. Details are described in section 3. | |
4ed46869 KH |
55 | |
56 | 2. SJIS (or Shift-JIS or MS-Kanji-Code) | |
57 | ||
58 | A coding system to encode character sets: ASCII, JISX0201, and | |
59 | JISX0208. Widely used for PC's in Japan. Details are described in | |
f4dee582 | 60 | section 4. |
4ed46869 KH |
61 | |
62 | 3. BIG5 | |
63 | ||
64 | A coding system to encode character sets: ASCII and Big5. Widely | |
65 | used by Chinese (mainly in Taiwan and Hong Kong). Details are | |
f4dee582 RS |
66 | described in section 4. In this file, when we write "BIG5" |
67 | (all uppercase), we mean the coding system, and when we write | |
68 | "Big5" (capitalized), we mean the character set. | |
4ed46869 | 69 | |
f4dee582 | 70 | 4. Other |
4ed46869 | 71 | |
f4dee582 | 72 | If a user wants to read/write a text encoded in a coding system not |
4ed46869 KH |
73 | listed above, he can supply a decoder and an encoder for it in CCL |
74 | (Code Conversion Language) programs. Emacs executes the CCL program | |
75 | while reading/writing. | |
76 | ||
f4dee582 | 77 | Emacs represents a coding-system by a Lisp symbol that has a property |
4ed46869 KH |
78 | `coding-system'. But, before actually using the coding-system, the |
79 | information about it is set in a structure of type `struct | |
f4dee582 | 80 | coding_system' for rapid processing. See section 6 for more details. |
4ed46869 KH |
81 | |
82 | */ | |
83 | ||
84 | /*** GENERAL NOTES on END-OF-LINE FORMAT *** | |
85 | ||
86 | How end-of-line of a text is encoded depends on a system. For | |
87 | instance, Unix's format is just one byte of `line-feed' code, | |
f4dee582 | 88 | whereas DOS's format is two-byte sequence of `carriage-return' and |
4ed46869 KH |
89 | `line-feed' codes. MacOS's format is one byte of `carriage-return'. |
90 | ||
f4dee582 RS |
91 | Since text characters encoding and end-of-line encoding are |
92 | independent, any coding system described above can take | |
4ed46869 | 93 | any format of end-of-line. So, Emacs has information of format of |
f4dee582 | 94 | end-of-line in each coding-system. See section 6 for more details. |
4ed46869 KH |
95 | |
96 | */ | |
97 | ||
98 | /*** GENERAL NOTES on `detect_coding_XXX ()' functions *** | |
99 | ||
100 | These functions check if a text between SRC and SRC_END is encoded | |
101 | in the coding system category XXX. Each returns an integer value in | |
102 | which appropriate flag bits for the category XXX is set. The flag | |
103 | bits are defined in macros CODING_CATEGORY_MASK_XXX. Below is the | |
104 | template of these functions. */ | |
105 | #if 0 | |
106 | int | |
0ef69138 | 107 | detect_coding_emacs_mule (src, src_end) |
4ed46869 KH |
108 | unsigned char *src, *src_end; |
109 | { | |
110 | ... | |
111 | } | |
112 | #endif | |
113 | ||
114 | /*** GENERAL NOTES on `decode_coding_XXX ()' functions *** | |
115 | ||
116 | These functions decode SRC_BYTES length text at SOURCE encoded in | |
0ef69138 | 117 | CODING to Emacs' internal format (emacs-mule). The resulting text |
f4dee582 RS |
118 | goes to a place pointed to by DESTINATION, the length of which should |
119 | not exceed DST_BYTES. The number of bytes actually processed is | |
120 | returned as *CONSUMED. The return value is the length of the decoded | |
121 | text. Below is a template of these functions. */ | |
4ed46869 KH |
122 | #if 0 |
123 | decode_coding_XXX (coding, source, destination, src_bytes, dst_bytes, consumed) | |
124 | struct coding_system *coding; | |
125 | unsigned char *source, *destination; | |
126 | int src_bytes, dst_bytes; | |
127 | int *consumed; | |
128 | { | |
129 | ... | |
130 | } | |
131 | #endif | |
132 | ||
133 | /*** GENERAL NOTES on `encode_coding_XXX ()' functions *** | |
134 | ||
0ef69138 KH |
135 | These functions encode SRC_BYTES length text at SOURCE of Emacs' |
136 | internal format (emacs-mule) to CODING. The resulting text goes to | |
f4dee582 RS |
137 | a place pointed to by DESTINATION, the length of which should not |
138 | exceed DST_BYTES. The number of bytes actually processed is | |
139 | returned as *CONSUMED. The return value is the length of the | |
140 | encoded text. Below is a template of these functions. */ | |
4ed46869 KH |
141 | #if 0 |
142 | encode_coding_XXX (coding, source, destination, src_bytes, dst_bytes, consumed) | |
143 | struct coding_system *coding; | |
144 | unsigned char *source, *destination; | |
145 | int src_bytes, dst_bytes; | |
146 | int *consumed; | |
147 | { | |
148 | ... | |
149 | } | |
150 | #endif | |
151 | ||
152 | /*** COMMONLY USED MACROS ***/ | |
153 | ||
154 | /* The following three macros ONE_MORE_BYTE, TWO_MORE_BYTES, and | |
155 | THREE_MORE_BYTES safely get one, two, and three bytes from the | |
156 | source text respectively. If there are not enough bytes in the | |
157 | source, they jump to `label_end_of_loop'. The caller should set | |
158 | variables `src' and `src_end' to appropriate areas in advance. */ | |
159 | ||
160 | #define ONE_MORE_BYTE(c1) \ | |
161 | do { \ | |
162 | if (src < src_end) \ | |
163 | c1 = *src++; \ | |
164 | else \ | |
165 | goto label_end_of_loop; \ | |
166 | } while (0) | |
167 | ||
168 | #define TWO_MORE_BYTES(c1, c2) \ | |
169 | do { \ | |
170 | if (src + 1 < src_end) \ | |
171 | c1 = *src++, c2 = *src++; \ | |
172 | else \ | |
173 | goto label_end_of_loop; \ | |
174 | } while (0) | |
175 | ||
176 | #define THREE_MORE_BYTES(c1, c2, c3) \ | |
177 | do { \ | |
178 | if (src + 2 < src_end) \ | |
179 | c1 = *src++, c2 = *src++, c3 = *src++; \ | |
180 | else \ | |
181 | goto label_end_of_loop; \ | |
182 | } while (0) | |
183 | ||
184 | /* The following three macros DECODE_CHARACTER_ASCII, | |
185 | DECODE_CHARACTER_DIMENSION1, and DECODE_CHARACTER_DIMENSION2 put | |
186 | the multi-byte form of a character of each class at the place | |
187 | pointed by `dst'. The caller should set the variable `dst' to | |
188 | point to an appropriate area and the variable `coding' to point to | |
189 | the coding-system of the currently decoding text in advance. */ | |
190 | ||
191 | /* Decode one ASCII character C. */ | |
192 | ||
193 | #define DECODE_CHARACTER_ASCII(c) \ | |
194 | do { \ | |
195 | if (COMPOSING_P (coding->composing)) \ | |
196 | *dst++ = 0xA0, *dst++ = (c) | 0x80; \ | |
197 | else \ | |
198 | *dst++ = (c); \ | |
199 | } while (0) | |
200 | ||
f4dee582 | 201 | /* Decode one DIMENSION1 character whose charset is CHARSET and whose |
4ed46869 KH |
202 | position-code is C. */ |
203 | ||
204 | #define DECODE_CHARACTER_DIMENSION1(charset, c) \ | |
205 | do { \ | |
206 | unsigned char leading_code = CHARSET_LEADING_CODE_BASE (charset); \ | |
207 | if (COMPOSING_P (coding->composing)) \ | |
208 | *dst++ = leading_code + 0x20; \ | |
209 | else \ | |
210 | *dst++ = leading_code; \ | |
211 | if (leading_code = CHARSET_LEADING_CODE_EXT (charset)) \ | |
212 | *dst++ = leading_code; \ | |
213 | *dst++ = (c) | 0x80; \ | |
214 | } while (0) | |
215 | ||
f4dee582 | 216 | /* Decode one DIMENSION2 character whose charset is CHARSET and whose |
4ed46869 KH |
217 | position-codes are C1 and C2. */ |
218 | ||
219 | #define DECODE_CHARACTER_DIMENSION2(charset, c1, c2) \ | |
220 | do { \ | |
221 | DECODE_CHARACTER_DIMENSION1 (charset, c1); \ | |
222 | *dst++ = (c2) | 0x80; \ | |
223 | } while (0) | |
224 | ||
225 | \f | |
226 | /*** 1. Preamble ***/ | |
227 | ||
228 | #include <stdio.h> | |
229 | ||
230 | #ifdef emacs | |
231 | ||
232 | #include <config.h> | |
233 | #include "lisp.h" | |
234 | #include "buffer.h" | |
235 | #include "charset.h" | |
236 | #include "ccl.h" | |
237 | #include "coding.h" | |
238 | #include "window.h" | |
239 | ||
240 | #else /* not emacs */ | |
241 | ||
242 | #include "mulelib.h" | |
243 | ||
244 | #endif /* not emacs */ | |
245 | ||
246 | Lisp_Object Qcoding_system, Qeol_type; | |
247 | Lisp_Object Qbuffer_file_coding_system; | |
248 | Lisp_Object Qpost_read_conversion, Qpre_write_conversion; | |
249 | ||
250 | extern Lisp_Object Qinsert_file_contents, Qwrite_region; | |
251 | Lisp_Object Qcall_process, Qcall_process_region, Qprocess_argument; | |
252 | Lisp_Object Qstart_process, Qopen_network_stream; | |
253 | Lisp_Object Qtarget_idx; | |
254 | ||
255 | /* Mnemonic character of each format of end-of-line. */ | |
256 | int eol_mnemonic_unix, eol_mnemonic_dos, eol_mnemonic_mac; | |
257 | /* Mnemonic character to indicate format of end-of-line is not yet | |
258 | decided. */ | |
259 | int eol_mnemonic_undecided; | |
260 | ||
9ce27fde KH |
261 | /* Format of end-of-line decided by system. This is CODING_EOL_LF on |
262 | Unix, CODING_EOL_CRLF on DOS/Windows, and CODING_EOL_CR on Mac. */ | |
263 | int system_eol_type; | |
264 | ||
4ed46869 KH |
265 | #ifdef emacs |
266 | ||
02ba4723 | 267 | Lisp_Object Qcoding_system_spec, Qcoding_system_p, Qcoding_system_error; |
4ed46869 | 268 | |
9ce27fde KH |
269 | /* Coding system emacs-mule is for converting only end-of-line format. */ |
270 | Lisp_Object Qemacs_mule; | |
271 | ||
4ed46869 KH |
272 | /* Coding-systems are handed between Emacs Lisp programs and C internal |
273 | routines by the following three variables. */ | |
274 | /* Coding-system for reading files and receiving data from process. */ | |
275 | Lisp_Object Vcoding_system_for_read; | |
276 | /* Coding-system for writing files and sending data to process. */ | |
277 | Lisp_Object Vcoding_system_for_write; | |
278 | /* Coding-system actually used in the latest I/O. */ | |
279 | Lisp_Object Vlast_coding_system_used; | |
280 | ||
9ce27fde KH |
281 | /* Flag to inhibit code conversion of end-of-line format. */ |
282 | int inhibit_eol_conversion; | |
283 | ||
4ed46869 KH |
284 | /* Coding-system of what terminal accept for displaying. */ |
285 | struct coding_system terminal_coding; | |
286 | ||
287 | /* Coding-system of what is sent from terminal keyboard. */ | |
288 | struct coding_system keyboard_coding; | |
289 | ||
02ba4723 KH |
290 | Lisp_Object Vfile_coding_system_alist; |
291 | Lisp_Object Vprocess_coding_system_alist; | |
292 | Lisp_Object Vnetwork_coding_system_alist; | |
4ed46869 KH |
293 | |
294 | #endif /* emacs */ | |
295 | ||
296 | Lisp_Object Qcoding_category_index; | |
297 | ||
298 | /* List of symbols `coding-category-xxx' ordered by priority. */ | |
299 | Lisp_Object Vcoding_category_list; | |
300 | ||
301 | /* Table of coding-systems currently assigned to each coding-category. */ | |
302 | Lisp_Object coding_category_table[CODING_CATEGORY_IDX_MAX]; | |
303 | ||
304 | /* Table of names of symbol for each coding-category. */ | |
305 | char *coding_category_name[CODING_CATEGORY_IDX_MAX] = { | |
0ef69138 | 306 | "coding-category-emacs-mule", |
4ed46869 KH |
307 | "coding-category-sjis", |
308 | "coding-category-iso-7", | |
309 | "coding-category-iso-8-1", | |
310 | "coding-category-iso-8-2", | |
7717c392 KH |
311 | "coding-category-iso-7-else", |
312 | "coding-category-iso-8-else", | |
4ed46869 KH |
313 | "coding-category-big5", |
314 | "coding-category-binary" | |
315 | }; | |
316 | ||
bdd9fb48 KH |
317 | /* Flag to tell if we look up unification table on character code |
318 | conversion. */ | |
319 | Lisp_Object Venable_character_unification; | |
a5d301df KH |
320 | /* Standard unification table to look up on decoding (reading). */ |
321 | Lisp_Object Vstandard_character_unification_table_for_decode; | |
322 | /* Standard unification table to look up on encoding (writing). */ | |
323 | Lisp_Object Vstandard_character_unification_table_for_encode; | |
bdd9fb48 KH |
324 | |
325 | Lisp_Object Qcharacter_unification_table; | |
a5d301df KH |
326 | Lisp_Object Qcharacter_unification_table_for_decode; |
327 | Lisp_Object Qcharacter_unification_table_for_encode; | |
4ed46869 KH |
328 | |
329 | /* Alist of charsets vs revision number. */ | |
330 | Lisp_Object Vcharset_revision_alist; | |
331 | ||
02ba4723 KH |
332 | /* Default coding systems used for process I/O. */ |
333 | Lisp_Object Vdefault_process_coding_system; | |
334 | ||
4ed46869 | 335 | \f |
0ef69138 | 336 | /*** 2. Emacs internal format (emacs-mule) handlers ***/ |
4ed46869 KH |
337 | |
338 | /* Emacs' internal format for encoding multiple character sets is a | |
f4dee582 RS |
339 | kind of multi-byte encoding, i.e. characters are encoded by |
340 | variable-length sequences of one-byte codes. ASCII characters | |
341 | and control characters (e.g. `tab', `newline') are represented by | |
342 | one-byte sequences which are their ASCII codes, in the range 0x00 | |
343 | through 0x7F. The other characters are represented by a sequence | |
344 | of `base leading-code', optional `extended leading-code', and one | |
345 | or two `position-code's. The length of the sequence is determined | |
346 | by the base leading-code. Leading-code takes the range 0x80 | |
347 | through 0x9F, whereas extended leading-code and position-code take | |
348 | the range 0xA0 through 0xFF. See `charset.h' for more details | |
349 | about leading-code and position-code. | |
350 | ||
351 | There's one exception to this rule. Special leading-code | |
4ed46869 KH |
352 | `leading-code-composition' denotes that the following several |
353 | characters should be composed into one character. Leading-codes of | |
354 | components (except for ASCII) are added 0x20. An ASCII character | |
355 | component is represented by a 2-byte sequence of `0xA0' and | |
f4dee582 RS |
356 | `ASCII-code + 0x80'. See also the comments in `charset.h' for the |
357 | details of composite character. Hence, we can summarize the code | |
4ed46869 KH |
358 | range as follows: |
359 | ||
360 | --- CODE RANGE of Emacs' internal format --- | |
361 | (character set) (range) | |
362 | ASCII 0x00 .. 0x7F | |
363 | ELSE (1st byte) 0x80 .. 0x9F | |
364 | (rest bytes) 0xA0 .. 0xFF | |
365 | --------------------------------------------- | |
366 | ||
367 | */ | |
368 | ||
369 | enum emacs_code_class_type emacs_code_class[256]; | |
370 | ||
371 | /* Go to the next statement only if *SRC is accessible and the code is | |
372 | greater than 0xA0. */ | |
373 | #define CHECK_CODE_RANGE_A0_FF \ | |
374 | do { \ | |
375 | if (src >= src_end) \ | |
376 | goto label_end_of_switch; \ | |
377 | else if (*src++ < 0xA0) \ | |
378 | return 0; \ | |
379 | } while (0) | |
380 | ||
381 | /* See the above "GENERAL NOTES on `detect_coding_XXX ()' functions". | |
382 | Check if a text is encoded in Emacs' internal format. If it is, | |
0ef69138 | 383 | return CODING_CATEGORY_MASK_EMASC_MULE, else return 0. */ |
4ed46869 KH |
384 | |
385 | int | |
0ef69138 | 386 | detect_coding_emacs_mule (src, src_end) |
4ed46869 KH |
387 | unsigned char *src, *src_end; |
388 | { | |
389 | unsigned char c; | |
390 | int composing = 0; | |
391 | ||
392 | while (src < src_end) | |
393 | { | |
394 | c = *src++; | |
395 | ||
396 | if (composing) | |
397 | { | |
398 | if (c < 0xA0) | |
399 | composing = 0; | |
400 | else | |
401 | c -= 0x20; | |
402 | } | |
403 | ||
404 | switch (emacs_code_class[c]) | |
405 | { | |
406 | case EMACS_ascii_code: | |
407 | case EMACS_linefeed_code: | |
408 | break; | |
409 | ||
410 | case EMACS_control_code: | |
411 | if (c == ISO_CODE_ESC || c == ISO_CODE_SI || c == ISO_CODE_SO) | |
412 | return 0; | |
413 | break; | |
414 | ||
415 | case EMACS_invalid_code: | |
416 | return 0; | |
417 | ||
418 | case EMACS_leading_code_composition: /* c == 0x80 */ | |
419 | if (composing) | |
420 | CHECK_CODE_RANGE_A0_FF; | |
421 | else | |
422 | composing = 1; | |
423 | break; | |
424 | ||
425 | case EMACS_leading_code_4: | |
426 | CHECK_CODE_RANGE_A0_FF; | |
427 | /* fall down to check it two more times ... */ | |
428 | ||
429 | case EMACS_leading_code_3: | |
430 | CHECK_CODE_RANGE_A0_FF; | |
431 | /* fall down to check it one more time ... */ | |
432 | ||
433 | case EMACS_leading_code_2: | |
434 | CHECK_CODE_RANGE_A0_FF; | |
435 | break; | |
436 | ||
437 | default: | |
438 | label_end_of_switch: | |
439 | break; | |
440 | } | |
441 | } | |
0ef69138 | 442 | return CODING_CATEGORY_MASK_EMACS_MULE; |
4ed46869 KH |
443 | } |
444 | ||
445 | \f | |
446 | /*** 3. ISO2022 handlers ***/ | |
447 | ||
448 | /* The following note describes the coding system ISO2022 briefly. | |
f4dee582 RS |
449 | Since the intention of this note is to help in understanding of |
450 | the programs in this file, some parts are NOT ACCURATE or OVERLY | |
4ed46869 KH |
451 | SIMPLIFIED. For the thorough understanding, please refer to the |
452 | original document of ISO2022. | |
453 | ||
454 | ISO2022 provides many mechanisms to encode several character sets | |
f4dee582 | 455 | in 7-bit and 8-bit environment. If one chooses 7-bite environment, |
4ed46869 | 456 | all text is encoded by codes of less than 128. This may make the |
f4dee582 RS |
457 | encoded text a little bit longer, but the text gets more stability |
458 | to pass through several gateways (some of them strip off the MSB). | |
4ed46869 | 459 | |
f4dee582 | 460 | There are two kinds of character set: control character set and |
4ed46869 KH |
461 | graphic character set. The former contains control characters such |
462 | as `newline' and `escape' to provide control functions (control | |
f4dee582 | 463 | functions are provided also by escape sequences). The latter |
4ed46869 KH |
464 | contains graphic characters such as ' A' and '-'. Emacs recognizes |
465 | two control character sets and many graphic character sets. | |
466 | ||
467 | Graphic character sets are classified into one of the following | |
468 | four classes, DIMENSION1_CHARS94, DIMENSION1_CHARS96, | |
469 | DIMENSION2_CHARS94, DIMENSION2_CHARS96 according to the number of | |
470 | bytes (DIMENSION) and the number of characters in one dimension | |
471 | (CHARS) of the set. In addition, each character set is assigned an | |
472 | identification tag (called "final character" and denoted as <F> | |
473 | here after) which is unique in each class. <F> of each character | |
474 | set is decided by ECMA(*) when it is registered in ISO. Code range | |
475 | of <F> is 0x30..0x7F (0x30..0x3F are for private use only). | |
476 | ||
477 | Note (*): ECMA = European Computer Manufacturers Association | |
478 | ||
479 | Here are examples of graphic character set [NAME(<F>)]: | |
480 | o DIMENSION1_CHARS94 -- ASCII('B'), right-half-of-JISX0201('I'), ... | |
481 | o DIMENSION1_CHARS96 -- right-half-of-ISO8859-1('A'), ... | |
482 | o DIMENSION2_CHARS94 -- GB2312('A'), JISX0208('B'), ... | |
483 | o DIMENSION2_CHARS96 -- none for the moment | |
484 | ||
485 | A code area (1byte=8bits) is divided into 4 areas, C0, GL, C1, and GR. | |
486 | C0 [0x00..0x1F] -- control character plane 0 | |
487 | GL [0x20..0x7F] -- graphic character plane 0 | |
488 | C1 [0x80..0x9F] -- control character plane 1 | |
489 | GR [0xA0..0xFF] -- graphic character plane 1 | |
490 | ||
491 | A control character set is directly designated and invoked to C0 or | |
492 | C1 by an escape sequence. The most common case is that ISO646's | |
493 | control character set is designated/invoked to C0 and ISO6429's | |
494 | control character set is designated/invoked to C1, and usually | |
495 | these designations/invocations are omitted in a coded text. With | |
496 | 7-bit environment, only C0 can be used, and a control character for | |
497 | C1 is encoded by an appropriate escape sequence to fit in the | |
498 | environment. All control characters for C1 are defined the | |
499 | corresponding escape sequences. | |
500 | ||
501 | A graphic character set is at first designated to one of four | |
502 | graphic registers (G0 through G3), then these graphic registers are | |
503 | invoked to GL or GR. These designations and invocations can be | |
504 | done independently. The most common case is that G0 is invoked to | |
505 | GL, G1 is invoked to GR, and ASCII is designated to G0, and usually | |
506 | these invocations and designations are omitted in a coded text. | |
507 | With 7-bit environment, only GL can be used. | |
508 | ||
509 | When a graphic character set of CHARS94 is invoked to GL, code 0x20 | |
510 | and 0x7F of GL area work as control characters SPACE and DEL | |
511 | respectively, and code 0xA0 and 0xFF of GR area should not be used. | |
512 | ||
513 | There are two ways of invocation: locking-shift and single-shift. | |
514 | With locking-shift, the invocation lasts until the next different | |
515 | invocation, whereas with single-shift, the invocation works only | |
516 | for the following character and doesn't affect locking-shift. | |
517 | Invocations are done by the following control characters or escape | |
518 | sequences. | |
519 | ||
520 | ---------------------------------------------------------------------- | |
521 | function control char escape sequence description | |
522 | ---------------------------------------------------------------------- | |
523 | SI (shift-in) 0x0F none invoke G0 to GL | |
10bff6f1 | 524 | SO (shift-out) 0x0E none invoke G1 to GL |
4ed46869 KH |
525 | LS2 (locking-shift-2) none ESC 'n' invoke G2 into GL |
526 | LS3 (locking-shift-3) none ESC 'o' invoke G3 into GL | |
527 | SS2 (single-shift-2) 0x8E ESC 'N' invoke G2 into GL | |
528 | SS3 (single-shift-3) 0x8F ESC 'O' invoke G3 into GL | |
529 | ---------------------------------------------------------------------- | |
530 | The first four are for locking-shift. Control characters for these | |
531 | functions are defined by macros ISO_CODE_XXX in `coding.h'. | |
532 | ||
533 | Designations are done by the following escape sequences. | |
534 | ---------------------------------------------------------------------- | |
535 | escape sequence description | |
536 | ---------------------------------------------------------------------- | |
537 | ESC '(' <F> designate DIMENSION1_CHARS94<F> to G0 | |
538 | ESC ')' <F> designate DIMENSION1_CHARS94<F> to G1 | |
539 | ESC '*' <F> designate DIMENSION1_CHARS94<F> to G2 | |
540 | ESC '+' <F> designate DIMENSION1_CHARS94<F> to G3 | |
541 | ESC ',' <F> designate DIMENSION1_CHARS96<F> to G0 (*) | |
542 | ESC '-' <F> designate DIMENSION1_CHARS96<F> to G1 | |
543 | ESC '.' <F> designate DIMENSION1_CHARS96<F> to G2 | |
544 | ESC '/' <F> designate DIMENSION1_CHARS96<F> to G3 | |
545 | ESC '$' '(' <F> designate DIMENSION2_CHARS94<F> to G0 (**) | |
546 | ESC '$' ')' <F> designate DIMENSION2_CHARS94<F> to G1 | |
547 | ESC '$' '*' <F> designate DIMENSION2_CHARS94<F> to G2 | |
548 | ESC '$' '+' <F> designate DIMENSION2_CHARS94<F> to G3 | |
549 | ESC '$' ',' <F> designate DIMENSION2_CHARS96<F> to G0 (*) | |
550 | ESC '$' '-' <F> designate DIMENSION2_CHARS96<F> to G1 | |
551 | ESC '$' '.' <F> designate DIMENSION2_CHARS96<F> to G2 | |
552 | ESC '$' '/' <F> designate DIMENSION2_CHARS96<F> to G3 | |
553 | ---------------------------------------------------------------------- | |
554 | ||
555 | In this list, "DIMENSION1_CHARS94<F>" means a graphic character set | |
556 | of dimension 1, chars 94, and final character <F>, and etc. | |
557 | ||
558 | Note (*): Although these designations are not allowed in ISO2022, | |
559 | Emacs accepts them on decoding, and produces them on encoding | |
560 | CHARS96 character set in a coding system which is characterized as | |
561 | 7-bit environment, non-locking-shift, and non-single-shift. | |
562 | ||
563 | Note (**): If <F> is '@', 'A', or 'B', the intermediate character | |
564 | '(' can be omitted. We call this as "short-form" here after. | |
565 | ||
566 | Now you may notice that there are a lot of ways for encoding the | |
f4dee582 | 567 | same multilingual text in ISO2022. Actually, there exists many |
4ed46869 KH |
568 | coding systems such as Compound Text (used in X's inter client |
569 | communication, ISO-2022-JP (used in Japanese Internet), ISO-2022-KR | |
570 | (used in Korean Internet), EUC (Extended UNIX Code, used in Asian | |
571 | localized platforms), and all of these are variants of ISO2022. | |
572 | ||
573 | In addition to the above, Emacs handles two more kinds of escape | |
574 | sequences: ISO6429's direction specification and Emacs' private | |
575 | sequence for specifying character composition. | |
576 | ||
577 | ISO6429's direction specification takes the following format: | |
578 | o CSI ']' -- end of the current direction | |
579 | o CSI '0' ']' -- end of the current direction | |
580 | o CSI '1' ']' -- start of left-to-right text | |
581 | o CSI '2' ']' -- start of right-to-left text | |
582 | The control character CSI (0x9B: control sequence introducer) is | |
583 | abbreviated to the escape sequence ESC '[' in 7-bit environment. | |
584 | ||
585 | Character composition specification takes the following format: | |
586 | o ESC '0' -- start character composition | |
587 | o ESC '1' -- end character composition | |
588 | Since these are not standard escape sequences of any ISO, the use | |
589 | of them for these meaning is restricted to Emacs only. */ | |
590 | ||
591 | enum iso_code_class_type iso_code_class[256]; | |
592 | ||
593 | /* See the above "GENERAL NOTES on `detect_coding_XXX ()' functions". | |
594 | Check if a text is encoded in ISO2022. If it is, returns an | |
595 | integer in which appropriate flag bits any of: | |
596 | CODING_CATEGORY_MASK_ISO_7 | |
597 | CODING_CATEGORY_MASK_ISO_8_1 | |
598 | CODING_CATEGORY_MASK_ISO_8_2 | |
7717c392 KH |
599 | CODING_CATEGORY_MASK_ISO_7_ELSE |
600 | CODING_CATEGORY_MASK_ISO_8_ELSE | |
4ed46869 KH |
601 | are set. If a code which should never appear in ISO2022 is found, |
602 | returns 0. */ | |
603 | ||
604 | int | |
605 | detect_coding_iso2022 (src, src_end) | |
606 | unsigned char *src, *src_end; | |
607 | { | |
765a2ca5 KH |
608 | int mask = (CODING_CATEGORY_MASK_ISO_7 |
609 | | CODING_CATEGORY_MASK_ISO_8_1 | |
610 | | CODING_CATEGORY_MASK_ISO_8_2 | |
7717c392 KH |
611 | | CODING_CATEGORY_MASK_ISO_7_ELSE |
612 | | CODING_CATEGORY_MASK_ISO_8_ELSE | |
613 | ); | |
bcf26d6a KH |
614 | int g1 = 0; /* 1 iff designating to G1. */ |
615 | int c, i; | |
4ed46869 | 616 | |
e0e989f6 | 617 | while (src < src_end) |
4ed46869 KH |
618 | { |
619 | c = *src++; | |
620 | switch (c) | |
621 | { | |
622 | case ISO_CODE_ESC: | |
e0e989f6 | 623 | if (src >= src_end) |
4ed46869 KH |
624 | break; |
625 | c = *src++; | |
bf9cdd4e | 626 | if ((c >= '(' && c <= '/')) |
4ed46869 | 627 | { |
bf9cdd4e KH |
628 | /* Designation sequence for a charset of dimension 1. */ |
629 | if (src >= src_end) | |
630 | break; | |
631 | c = *src++; | |
632 | if (c < ' ' || c >= 0x80) | |
633 | /* Invalid designation sequence. */ | |
634 | return 0; | |
635 | } | |
636 | else if (c == '$') | |
637 | { | |
638 | /* Designation sequence for a charset of dimension 2. */ | |
639 | if (src >= src_end) | |
640 | break; | |
641 | c = *src++; | |
642 | if (c >= '@' && c <= 'B') | |
643 | /* Designation for JISX0208.1978, GB2312, or JISX0208. */ | |
644 | ; | |
645 | else if (c >= '(' && c <= '/') | |
bcf26d6a | 646 | { |
bf9cdd4e KH |
647 | if (src >= src_end) |
648 | break; | |
649 | c = *src++; | |
650 | if (c < ' ' || c >= 0x80) | |
651 | /* Invalid designation sequence. */ | |
652 | return 0; | |
bcf26d6a | 653 | } |
bf9cdd4e KH |
654 | else |
655 | /* Invalid designation sequence. */ | |
656 | return 0; | |
4ed46869 | 657 | } |
4ed46869 | 658 | else if (c == 'N' || c == 'O' || c == 'n' || c == 'o') |
bf9cdd4e | 659 | /* Locking shift. */ |
7717c392 KH |
660 | mask &= (CODING_CATEGORY_MASK_ISO_7_ELSE |
661 | | CODING_CATEGORY_MASK_ISO_8_ELSE); | |
bf9cdd4e KH |
662 | else if (c == '0' || c == '1' || c == '2') |
663 | /* Start/end composition. */ | |
664 | ; | |
665 | else | |
666 | /* Invalid escape sequence. */ | |
667 | return 0; | |
4ed46869 KH |
668 | break; |
669 | ||
4ed46869 | 670 | case ISO_CODE_SO: |
bf9cdd4e KH |
671 | mask &= (CODING_CATEGORY_MASK_ISO_7_ELSE |
672 | | CODING_CATEGORY_MASK_ISO_8_ELSE); | |
e0e989f6 KH |
673 | break; |
674 | ||
4ed46869 KH |
675 | case ISO_CODE_CSI: |
676 | case ISO_CODE_SS2: | |
677 | case ISO_CODE_SS3: | |
bf9cdd4e | 678 | return CODING_CATEGORY_MASK_ISO_8_ELSE; |
4ed46869 KH |
679 | |
680 | default: | |
681 | if (c < 0x80) | |
682 | break; | |
683 | else if (c < 0xA0) | |
684 | return 0; | |
685 | else | |
686 | { | |
7717c392 | 687 | unsigned char *src_begin = src; |
4ed46869 | 688 | |
7717c392 KH |
689 | mask &= ~(CODING_CATEGORY_MASK_ISO_7 |
690 | | CODING_CATEGORY_MASK_ISO_7_ELSE); | |
e0e989f6 | 691 | while (src < src_end && *src >= 0xA0) |
7717c392 KH |
692 | src++; |
693 | if ((src - src_begin - 1) & 1 && src < src_end) | |
4ed46869 KH |
694 | mask &= ~CODING_CATEGORY_MASK_ISO_8_2; |
695 | } | |
696 | break; | |
697 | } | |
698 | } | |
699 | ||
700 | return mask; | |
701 | } | |
702 | ||
703 | /* Decode a character of which charset is CHARSET and the 1st position | |
bdd9fb48 | 704 | code is C1. If dimension of CHARSET is 2, the 2nd position code is |
4ed46869 KH |
705 | fetched from SRC and set to C2. If CHARSET is negative, it means |
706 | that we are decoding ill formed text, and what we can do is just to | |
707 | read C1 as is. */ | |
708 | ||
bdd9fb48 KH |
709 | #define DECODE_ISO_CHARACTER(charset, c1) \ |
710 | do { \ | |
711 | int c_alt, charset_alt = (charset); \ | |
712 | if (COMPOSING_HEAD_P (coding->composing)) \ | |
713 | { \ | |
714 | *dst++ = LEADING_CODE_COMPOSITION; \ | |
715 | if (COMPOSING_WITH_RULE_P (coding->composing)) \ | |
716 | /* To tell composition rules are embeded. */ \ | |
717 | *dst++ = 0xFF; \ | |
718 | coding->composing += 2; \ | |
719 | } \ | |
720 | if ((charset) >= 0) \ | |
721 | { \ | |
722 | if (CHARSET_DIMENSION (charset) == 2) \ | |
723 | ONE_MORE_BYTE (c2); \ | |
724 | if (!NILP (unification_table) \ | |
725 | && ((c_alt = unify_char (unification_table, \ | |
726 | -1, (charset), c1, c2)) >= 0)) \ | |
727 | SPLIT_CHAR (c_alt, charset_alt, c1, c2); \ | |
728 | } \ | |
729 | if (charset_alt == CHARSET_ASCII || charset_alt < 0) \ | |
730 | DECODE_CHARACTER_ASCII (c1); \ | |
731 | else if (CHARSET_DIMENSION (charset_alt) == 1) \ | |
732 | DECODE_CHARACTER_DIMENSION1 (charset_alt, c1); \ | |
733 | else \ | |
734 | DECODE_CHARACTER_DIMENSION2 (charset_alt, c1, c2); \ | |
735 | if (COMPOSING_WITH_RULE_P (coding->composing)) \ | |
736 | /* To tell a composition rule follows. */ \ | |
737 | coding->composing = COMPOSING_WITH_RULE_RULE; \ | |
4ed46869 KH |
738 | } while (0) |
739 | ||
740 | /* Set designation state into CODING. */ | |
741 | #define DECODE_DESIGNATION(reg, dimension, chars, final_char) \ | |
742 | do { \ | |
2e34157c RS |
743 | int charset = ISO_CHARSET_TABLE (make_number (dimension), \ |
744 | make_number (chars), \ | |
745 | make_number (final_char)); \ | |
4ed46869 KH |
746 | if (charset >= 0) \ |
747 | { \ | |
748 | if (coding->direction == 1 \ | |
749 | && CHARSET_REVERSE_CHARSET (charset) >= 0) \ | |
750 | charset = CHARSET_REVERSE_CHARSET (charset); \ | |
751 | CODING_SPEC_ISO_DESIGNATION (coding, reg) = charset; \ | |
752 | } \ | |
753 | } while (0) | |
754 | ||
755 | /* See the above "GENERAL NOTES on `decode_coding_XXX ()' functions". */ | |
756 | ||
757 | int | |
758 | decode_coding_iso2022 (coding, source, destination, | |
759 | src_bytes, dst_bytes, consumed) | |
760 | struct coding_system *coding; | |
761 | unsigned char *source, *destination; | |
762 | int src_bytes, dst_bytes; | |
763 | int *consumed; | |
764 | { | |
765 | unsigned char *src = source; | |
766 | unsigned char *src_end = source + src_bytes; | |
767 | unsigned char *dst = destination; | |
768 | unsigned char *dst_end = destination + dst_bytes; | |
769 | /* Since the maximum bytes produced by each loop is 7, we subtract 6 | |
770 | from DST_END to assure that overflow checking is necessary only | |
771 | at the head of loop. */ | |
772 | unsigned char *adjusted_dst_end = dst_end - 6; | |
773 | int charset; | |
774 | /* Charsets invoked to graphic plane 0 and 1 respectively. */ | |
775 | int charset0 = CODING_SPEC_ISO_PLANE_CHARSET (coding, 0); | |
776 | int charset1 = CODING_SPEC_ISO_PLANE_CHARSET (coding, 1); | |
a5d301df KH |
777 | Lisp_Object unification_table |
778 | = coding->character_unification_table_for_decode; | |
bdd9fb48 KH |
779 | |
780 | if (!NILP (Venable_character_unification) && NILP (unification_table)) | |
a5d301df | 781 | unification_table = Vstandard_character_unification_table_for_decode; |
4ed46869 KH |
782 | |
783 | while (src < src_end && dst < adjusted_dst_end) | |
784 | { | |
785 | /* SRC_BASE remembers the start position in source in each loop. | |
786 | The loop will be exited when there's not enough source text | |
787 | to analyze long escape sequence or 2-byte code (within macros | |
788 | ONE_MORE_BYTE or TWO_MORE_BYTES). In that case, SRC is reset | |
789 | to SRC_BASE before exiting. */ | |
790 | unsigned char *src_base = src; | |
bdd9fb48 | 791 | int c1 = *src++, c2; |
4ed46869 KH |
792 | |
793 | switch (iso_code_class [c1]) | |
794 | { | |
795 | case ISO_0x20_or_0x7F: | |
796 | if (!coding->composing | |
797 | && (charset0 < 0 || CHARSET_CHARS (charset0) == 94)) | |
798 | { | |
799 | /* This is SPACE or DEL. */ | |
800 | *dst++ = c1; | |
801 | break; | |
802 | } | |
803 | /* This is a graphic character, we fall down ... */ | |
804 | ||
805 | case ISO_graphic_plane_0: | |
806 | if (coding->composing == COMPOSING_WITH_RULE_RULE) | |
807 | { | |
808 | /* This is a composition rule. */ | |
809 | *dst++ = c1 | 0x80; | |
810 | coding->composing = COMPOSING_WITH_RULE_TAIL; | |
811 | } | |
812 | else | |
813 | DECODE_ISO_CHARACTER (charset0, c1); | |
814 | break; | |
815 | ||
816 | case ISO_0xA0_or_0xFF: | |
817 | if (charset1 < 0 || CHARSET_CHARS (charset1) == 94) | |
818 | { | |
819 | /* Invalid code. */ | |
820 | *dst++ = c1; | |
821 | break; | |
822 | } | |
823 | /* This is a graphic character, we fall down ... */ | |
824 | ||
825 | case ISO_graphic_plane_1: | |
826 | DECODE_ISO_CHARACTER (charset1, c1); | |
827 | break; | |
828 | ||
829 | case ISO_control_code: | |
830 | /* All ISO2022 control characters in this class have the | |
831 | same representation in Emacs internal format. */ | |
832 | *dst++ = c1; | |
833 | break; | |
834 | ||
835 | case ISO_carriage_return: | |
836 | if (coding->eol_type == CODING_EOL_CR) | |
837 | { | |
838 | *dst++ = '\n'; | |
839 | } | |
840 | else if (coding->eol_type == CODING_EOL_CRLF) | |
841 | { | |
842 | ONE_MORE_BYTE (c1); | |
843 | if (c1 == ISO_CODE_LF) | |
844 | *dst++ = '\n'; | |
845 | else | |
846 | { | |
847 | src--; | |
848 | *dst++ = c1; | |
849 | } | |
850 | } | |
851 | else | |
852 | { | |
853 | *dst++ = c1; | |
854 | } | |
855 | break; | |
856 | ||
857 | case ISO_shift_out: | |
e0e989f6 KH |
858 | if (CODING_SPEC_ISO_DESIGNATION (coding, 1) < 0) |
859 | goto label_invalid_escape_sequence; | |
4ed46869 KH |
860 | CODING_SPEC_ISO_INVOCATION (coding, 0) = 1; |
861 | charset0 = CODING_SPEC_ISO_PLANE_CHARSET (coding, 0); | |
862 | break; | |
863 | ||
864 | case ISO_shift_in: | |
865 | CODING_SPEC_ISO_INVOCATION (coding, 0) = 0; | |
866 | charset0 = CODING_SPEC_ISO_PLANE_CHARSET (coding, 0); | |
867 | break; | |
868 | ||
869 | case ISO_single_shift_2_7: | |
870 | case ISO_single_shift_2: | |
871 | /* SS2 is handled as an escape sequence of ESC 'N' */ | |
872 | c1 = 'N'; | |
873 | goto label_escape_sequence; | |
874 | ||
875 | case ISO_single_shift_3: | |
876 | /* SS2 is handled as an escape sequence of ESC 'O' */ | |
877 | c1 = 'O'; | |
878 | goto label_escape_sequence; | |
879 | ||
880 | case ISO_control_sequence_introducer: | |
881 | /* CSI is handled as an escape sequence of ESC '[' ... */ | |
882 | c1 = '['; | |
883 | goto label_escape_sequence; | |
884 | ||
885 | case ISO_escape: | |
886 | ONE_MORE_BYTE (c1); | |
887 | label_escape_sequence: | |
888 | /* Escape sequences handled by Emacs are invocation, | |
889 | designation, direction specification, and character | |
890 | composition specification. */ | |
891 | switch (c1) | |
892 | { | |
893 | case '&': /* revision of following character set */ | |
894 | ONE_MORE_BYTE (c1); | |
895 | if (!(c1 >= '@' && c1 <= '~')) | |
e0e989f6 | 896 | goto label_invalid_escape_sequence; |
4ed46869 KH |
897 | ONE_MORE_BYTE (c1); |
898 | if (c1 != ISO_CODE_ESC) | |
e0e989f6 | 899 | goto label_invalid_escape_sequence; |
4ed46869 KH |
900 | ONE_MORE_BYTE (c1); |
901 | goto label_escape_sequence; | |
902 | ||
903 | case '$': /* designation of 2-byte character set */ | |
904 | ONE_MORE_BYTE (c1); | |
905 | if (c1 >= '@' && c1 <= 'B') | |
906 | { /* designation of JISX0208.1978, GB2312.1980, | |
907 | or JISX0208.1980 */ | |
908 | DECODE_DESIGNATION (0, 2, 94, c1); | |
909 | } | |
910 | else if (c1 >= 0x28 && c1 <= 0x2B) | |
911 | { /* designation of DIMENSION2_CHARS94 character set */ | |
912 | ONE_MORE_BYTE (c2); | |
913 | DECODE_DESIGNATION (c1 - 0x28, 2, 94, c2); | |
914 | } | |
915 | else if (c1 >= 0x2C && c1 <= 0x2F) | |
916 | { /* designation of DIMENSION2_CHARS96 character set */ | |
917 | ONE_MORE_BYTE (c2); | |
918 | DECODE_DESIGNATION (c1 - 0x2C, 2, 96, c2); | |
919 | } | |
920 | else | |
e0e989f6 | 921 | goto label_invalid_escape_sequence; |
4ed46869 KH |
922 | break; |
923 | ||
924 | case 'n': /* invocation of locking-shift-2 */ | |
e0e989f6 KH |
925 | if (CODING_SPEC_ISO_DESIGNATION (coding, 2) < 0) |
926 | goto label_invalid_escape_sequence; | |
4ed46869 | 927 | CODING_SPEC_ISO_INVOCATION (coding, 0) = 2; |
e0e989f6 | 928 | charset0 = CODING_SPEC_ISO_PLANE_CHARSET (coding, 0); |
4ed46869 KH |
929 | break; |
930 | ||
931 | case 'o': /* invocation of locking-shift-3 */ | |
e0e989f6 KH |
932 | if (CODING_SPEC_ISO_DESIGNATION (coding, 3) < 0) |
933 | goto label_invalid_escape_sequence; | |
4ed46869 | 934 | CODING_SPEC_ISO_INVOCATION (coding, 0) = 3; |
e0e989f6 | 935 | charset0 = CODING_SPEC_ISO_PLANE_CHARSET (coding, 0); |
4ed46869 KH |
936 | break; |
937 | ||
938 | case 'N': /* invocation of single-shift-2 */ | |
e0e989f6 KH |
939 | if (CODING_SPEC_ISO_DESIGNATION (coding, 2) < 0) |
940 | goto label_invalid_escape_sequence; | |
4ed46869 KH |
941 | ONE_MORE_BYTE (c1); |
942 | charset = CODING_SPEC_ISO_DESIGNATION (coding, 2); | |
943 | DECODE_ISO_CHARACTER (charset, c1); | |
944 | break; | |
945 | ||
946 | case 'O': /* invocation of single-shift-3 */ | |
e0e989f6 KH |
947 | if (CODING_SPEC_ISO_DESIGNATION (coding, 3) < 0) |
948 | goto label_invalid_escape_sequence; | |
4ed46869 KH |
949 | ONE_MORE_BYTE (c1); |
950 | charset = CODING_SPEC_ISO_DESIGNATION (coding, 3); | |
951 | DECODE_ISO_CHARACTER (charset, c1); | |
952 | break; | |
953 | ||
954 | case '0': /* start composing without embeded rules */ | |
955 | coding->composing = COMPOSING_NO_RULE_HEAD; | |
956 | break; | |
957 | ||
958 | case '1': /* end composing */ | |
959 | coding->composing = COMPOSING_NO; | |
960 | break; | |
961 | ||
962 | case '2': /* start composing with embeded rules */ | |
963 | coding->composing = COMPOSING_WITH_RULE_HEAD; | |
964 | break; | |
965 | ||
966 | case '[': /* specification of direction */ | |
967 | /* For the moment, nested direction is not supported. | |
968 | So, the value of `coding->direction' is 0 or 1: 0 | |
969 | means left-to-right, 1 means right-to-left. */ | |
970 | ONE_MORE_BYTE (c1); | |
971 | switch (c1) | |
972 | { | |
973 | case ']': /* end of the current direction */ | |
974 | coding->direction = 0; | |
975 | ||
976 | case '0': /* end of the current direction */ | |
977 | case '1': /* start of left-to-right direction */ | |
978 | ONE_MORE_BYTE (c1); | |
979 | if (c1 == ']') | |
980 | coding->direction = 0; | |
981 | else | |
982 | goto label_invalid_escape_sequence; | |
983 | break; | |
984 | ||
985 | case '2': /* start of right-to-left direction */ | |
986 | ONE_MORE_BYTE (c1); | |
987 | if (c1 == ']') | |
988 | coding->direction= 1; | |
989 | else | |
990 | goto label_invalid_escape_sequence; | |
991 | break; | |
992 | ||
993 | default: | |
994 | goto label_invalid_escape_sequence; | |
995 | } | |
996 | break; | |
997 | ||
998 | default: | |
999 | if (c1 >= 0x28 && c1 <= 0x2B) | |
1000 | { /* designation of DIMENSION1_CHARS94 character set */ | |
1001 | ONE_MORE_BYTE (c2); | |
1002 | DECODE_DESIGNATION (c1 - 0x28, 1, 94, c2); | |
1003 | } | |
1004 | else if (c1 >= 0x2C && c1 <= 0x2F) | |
1005 | { /* designation of DIMENSION1_CHARS96 character set */ | |
1006 | ONE_MORE_BYTE (c2); | |
1007 | DECODE_DESIGNATION (c1 - 0x2C, 1, 96, c2); | |
1008 | } | |
1009 | else | |
1010 | { | |
1011 | goto label_invalid_escape_sequence; | |
1012 | } | |
1013 | } | |
1014 | /* We must update these variables now. */ | |
1015 | charset0 = CODING_SPEC_ISO_PLANE_CHARSET (coding, 0); | |
1016 | charset1 = CODING_SPEC_ISO_PLANE_CHARSET (coding, 1); | |
1017 | break; | |
1018 | ||
1019 | label_invalid_escape_sequence: | |
1020 | { | |
1021 | int length = src - src_base; | |
1022 | ||
1023 | bcopy (src_base, dst, length); | |
1024 | dst += length; | |
1025 | } | |
1026 | } | |
1027 | continue; | |
1028 | ||
1029 | label_end_of_loop: | |
1030 | coding->carryover_size = src - src_base; | |
1031 | bcopy (src_base, coding->carryover, coding->carryover_size); | |
1032 | src = src_base; | |
1033 | break; | |
1034 | } | |
1035 | ||
1036 | /* If this is the last block of the text to be decoded, we had | |
1037 | better just flush out all remaining codes in the text although | |
1038 | they are not valid characters. */ | |
1039 | if (coding->last_block) | |
1040 | { | |
1041 | bcopy (src, dst, src_end - src); | |
1042 | dst += (src_end - src); | |
1043 | src = src_end; | |
1044 | } | |
1045 | *consumed = src - source; | |
1046 | return dst - destination; | |
1047 | } | |
1048 | ||
f4dee582 | 1049 | /* ISO2022 encoding stuff. */ |
4ed46869 KH |
1050 | |
1051 | /* | |
f4dee582 | 1052 | It is not enough to say just "ISO2022" on encoding, we have to |
4ed46869 KH |
1053 | specify more details. In Emacs, each coding-system of ISO2022 |
1054 | variant has the following specifications: | |
1055 | 1. Initial designation to G0 thru G3. | |
1056 | 2. Allows short-form designation? | |
1057 | 3. ASCII should be designated to G0 before control characters? | |
1058 | 4. ASCII should be designated to G0 at end of line? | |
1059 | 5. 7-bit environment or 8-bit environment? | |
1060 | 6. Use locking-shift? | |
1061 | 7. Use Single-shift? | |
1062 | And the following two are only for Japanese: | |
1063 | 8. Use ASCII in place of JIS0201-1976-Roman? | |
1064 | 9. Use JISX0208-1983 in place of JISX0208-1978? | |
1065 | These specifications are encoded in `coding->flags' as flag bits | |
1066 | defined by macros CODING_FLAG_ISO_XXX. See `coding.h' for more | |
f4dee582 | 1067 | details. |
4ed46869 KH |
1068 | */ |
1069 | ||
1070 | /* Produce codes (escape sequence) for designating CHARSET to graphic | |
1071 | register REG. If <final-char> of CHARSET is '@', 'A', or 'B' and | |
1072 | the coding system CODING allows, produce designation sequence of | |
1073 | short-form. */ | |
1074 | ||
1075 | #define ENCODE_DESIGNATION(charset, reg, coding) \ | |
1076 | do { \ | |
1077 | unsigned char final_char = CHARSET_ISO_FINAL_CHAR (charset); \ | |
1078 | char *intermediate_char_94 = "()*+"; \ | |
1079 | char *intermediate_char_96 = ",-./"; \ | |
1080 | Lisp_Object temp \ | |
1081 | = Fassq (make_number (charset), Vcharset_revision_alist); \ | |
1082 | if (! NILP (temp)) \ | |
1083 | { \ | |
1084 | *dst++ = ISO_CODE_ESC; \ | |
1085 | *dst++ = '&'; \ | |
1086 | *dst++ = XINT (XCONS (temp)->cdr) + '@'; \ | |
1087 | } \ | |
1088 | *dst++ = ISO_CODE_ESC; \ | |
1089 | if (CHARSET_DIMENSION (charset) == 1) \ | |
1090 | { \ | |
1091 | if (CHARSET_CHARS (charset) == 94) \ | |
1092 | *dst++ = (unsigned char) (intermediate_char_94[reg]); \ | |
1093 | else \ | |
1094 | *dst++ = (unsigned char) (intermediate_char_96[reg]); \ | |
1095 | } \ | |
1096 | else \ | |
1097 | { \ | |
1098 | *dst++ = '$'; \ | |
1099 | if (CHARSET_CHARS (charset) == 94) \ | |
1100 | { \ | |
1101 | if (! (coding->flags & CODING_FLAG_ISO_SHORT_FORM) \ | |
1102 | || reg != 0 \ | |
1103 | || final_char < '@' || final_char > 'B') \ | |
1104 | *dst++ = (unsigned char) (intermediate_char_94[reg]); \ | |
1105 | } \ | |
1106 | else \ | |
1107 | *dst++ = (unsigned char) (intermediate_char_96[reg]); \ | |
1108 | } \ | |
1109 | *dst++ = final_char; \ | |
1110 | CODING_SPEC_ISO_DESIGNATION (coding, reg) = charset; \ | |
1111 | } while (0) | |
1112 | ||
1113 | /* The following two macros produce codes (control character or escape | |
1114 | sequence) for ISO2022 single-shift functions (single-shift-2 and | |
1115 | single-shift-3). */ | |
1116 | ||
1117 | #define ENCODE_SINGLE_SHIFT_2 \ | |
1118 | do { \ | |
1119 | if (coding->flags & CODING_FLAG_ISO_SEVEN_BITS) \ | |
1120 | *dst++ = ISO_CODE_ESC, *dst++ = 'N'; \ | |
1121 | else \ | |
1122 | *dst++ = ISO_CODE_SS2; \ | |
1123 | CODING_SPEC_ISO_SINGLE_SHIFTING (coding) = 1; \ | |
1124 | } while (0) | |
1125 | ||
1126 | #define ENCODE_SINGLE_SHIFT_3 \ | |
1127 | do { \ | |
1128 | if (coding->flags & CODING_FLAG_ISO_SEVEN_BITS) \ | |
1129 | *dst++ = ISO_CODE_ESC, *dst++ = 'O'; \ | |
1130 | else \ | |
1131 | *dst++ = ISO_CODE_SS3; \ | |
1132 | CODING_SPEC_ISO_SINGLE_SHIFTING (coding) = 1; \ | |
1133 | } while (0) | |
1134 | ||
1135 | /* The following four macros produce codes (control character or | |
1136 | escape sequence) for ISO2022 locking-shift functions (shift-in, | |
1137 | shift-out, locking-shift-2, and locking-shift-3). */ | |
1138 | ||
1139 | #define ENCODE_SHIFT_IN \ | |
1140 | do { \ | |
1141 | *dst++ = ISO_CODE_SI; \ | |
1142 | CODING_SPEC_ISO_INVOCATION (coding, 0) = 0; \ | |
1143 | } while (0) | |
1144 | ||
1145 | #define ENCODE_SHIFT_OUT \ | |
1146 | do { \ | |
1147 | *dst++ = ISO_CODE_SO; \ | |
1148 | CODING_SPEC_ISO_INVOCATION (coding, 0) = 1; \ | |
1149 | } while (0) | |
1150 | ||
1151 | #define ENCODE_LOCKING_SHIFT_2 \ | |
1152 | do { \ | |
1153 | *dst++ = ISO_CODE_ESC, *dst++ = 'n'; \ | |
1154 | CODING_SPEC_ISO_INVOCATION (coding, 0) = 2; \ | |
1155 | } while (0) | |
1156 | ||
1157 | #define ENCODE_LOCKING_SHIFT_3 \ | |
1158 | do { \ | |
1159 | *dst++ = ISO_CODE_ESC, *dst++ = 'o'; \ | |
1160 | CODING_SPEC_ISO_INVOCATION (coding, 0) = 3; \ | |
1161 | } while (0) | |
1162 | ||
f4dee582 RS |
1163 | /* Produce codes for a DIMENSION1 character whose character set is |
1164 | CHARSET and whose position-code is C1. Designation and invocation | |
4ed46869 KH |
1165 | sequences are also produced in advance if necessary. */ |
1166 | ||
1167 | ||
1168 | #define ENCODE_ISO_CHARACTER_DIMENSION1(charset, c1) \ | |
1169 | do { \ | |
1170 | if (CODING_SPEC_ISO_SINGLE_SHIFTING (coding)) \ | |
1171 | { \ | |
1172 | if (coding->flags & CODING_FLAG_ISO_SEVEN_BITS) \ | |
1173 | *dst++ = c1 & 0x7F; \ | |
1174 | else \ | |
1175 | *dst++ = c1 | 0x80; \ | |
1176 | CODING_SPEC_ISO_SINGLE_SHIFTING (coding) = 0; \ | |
1177 | break; \ | |
1178 | } \ | |
1179 | else if (charset == CODING_SPEC_ISO_PLANE_CHARSET (coding, 0)) \ | |
1180 | { \ | |
1181 | *dst++ = c1 & 0x7F; \ | |
1182 | break; \ | |
1183 | } \ | |
1184 | else if (charset == CODING_SPEC_ISO_PLANE_CHARSET (coding, 1)) \ | |
1185 | { \ | |
1186 | *dst++ = c1 | 0x80; \ | |
1187 | break; \ | |
1188 | } \ | |
1189 | else \ | |
1190 | /* Since CHARSET is not yet invoked to any graphic planes, we \ | |
1191 | must invoke it, or, at first, designate it to some graphic \ | |
1192 | register. Then repeat the loop to actually produce the \ | |
1193 | character. */ \ | |
1194 | dst = encode_invocation_designation (charset, coding, dst); \ | |
1195 | } while (1) | |
1196 | ||
f4dee582 RS |
1197 | /* Produce codes for a DIMENSION2 character whose character set is |
1198 | CHARSET and whose position-codes are C1 and C2. Designation and | |
4ed46869 KH |
1199 | invocation codes are also produced in advance if necessary. */ |
1200 | ||
1201 | #define ENCODE_ISO_CHARACTER_DIMENSION2(charset, c1, c2) \ | |
1202 | do { \ | |
1203 | if (CODING_SPEC_ISO_SINGLE_SHIFTING (coding)) \ | |
1204 | { \ | |
1205 | if (coding->flags & CODING_FLAG_ISO_SEVEN_BITS) \ | |
1206 | *dst++ = c1 & 0x7F, *dst++ = c2 & 0x7F; \ | |
1207 | else \ | |
1208 | *dst++ = c1 | 0x80, *dst++ = c2 | 0x80; \ | |
1209 | CODING_SPEC_ISO_SINGLE_SHIFTING (coding) = 0; \ | |
1210 | break; \ | |
1211 | } \ | |
1212 | else if (charset == CODING_SPEC_ISO_PLANE_CHARSET (coding, 0)) \ | |
1213 | { \ | |
1214 | *dst++ = c1 & 0x7F, *dst++= c2 & 0x7F; \ | |
1215 | break; \ | |
1216 | } \ | |
1217 | else if (charset == CODING_SPEC_ISO_PLANE_CHARSET (coding, 1)) \ | |
1218 | { \ | |
1219 | *dst++ = c1 | 0x80, *dst++= c2 | 0x80; \ | |
1220 | break; \ | |
1221 | } \ | |
1222 | else \ | |
1223 | /* Since CHARSET is not yet invoked to any graphic planes, we \ | |
1224 | must invoke it, or, at first, designate it to some graphic \ | |
1225 | register. Then repeat the loop to actually produce the \ | |
1226 | character. */ \ | |
1227 | dst = encode_invocation_designation (charset, coding, dst); \ | |
1228 | } while (1) | |
1229 | ||
bdd9fb48 KH |
1230 | #define ENCODE_ISO_CHARACTER(charset, c1, c2) \ |
1231 | do { \ | |
1232 | int c_alt, charset_alt; \ | |
1233 | if (!NILP (unification_table) \ | |
1234 | && ((c_alt = unify_char (unification_table, -1, charset, c1, c2)) \ | |
a5d301df | 1235 | >= 0)) \ |
bdd9fb48 KH |
1236 | SPLIT_CHAR (c_alt, charset_alt, c1, c2); \ |
1237 | else \ | |
1238 | charset_alt = charset; \ | |
1239 | if (CHARSET_DIMENSION (charset_alt) == 1) \ | |
1240 | ENCODE_ISO_CHARACTER_DIMENSION1 (charset_alt, c1); \ | |
1241 | else \ | |
1242 | ENCODE_ISO_CHARACTER_DIMENSION2 (charset_alt, c1, c2); \ | |
1243 | } while (0) | |
1244 | ||
4ed46869 KH |
1245 | /* Produce designation and invocation codes at a place pointed by DST |
1246 | to use CHARSET. The element `spec.iso2022' of *CODING is updated. | |
1247 | Return new DST. */ | |
1248 | ||
1249 | unsigned char * | |
1250 | encode_invocation_designation (charset, coding, dst) | |
1251 | int charset; | |
1252 | struct coding_system *coding; | |
1253 | unsigned char *dst; | |
1254 | { | |
1255 | int reg; /* graphic register number */ | |
1256 | ||
1257 | /* At first, check designations. */ | |
1258 | for (reg = 0; reg < 4; reg++) | |
1259 | if (charset == CODING_SPEC_ISO_DESIGNATION (coding, reg)) | |
1260 | break; | |
1261 | ||
1262 | if (reg >= 4) | |
1263 | { | |
1264 | /* CHARSET is not yet designated to any graphic registers. */ | |
1265 | /* At first check the requested designation. */ | |
1266 | reg = CODING_SPEC_ISO_REQUESTED_DESIGNATION (coding, charset); | |
1ba9e4ab KH |
1267 | if (reg == CODING_SPEC_ISO_NO_REQUESTED_DESIGNATION) |
1268 | /* Since CHARSET requests no special designation, designate it | |
1269 | to graphic register 0. */ | |
4ed46869 KH |
1270 | reg = 0; |
1271 | ||
1272 | ENCODE_DESIGNATION (charset, reg, coding); | |
1273 | } | |
1274 | ||
1275 | if (CODING_SPEC_ISO_INVOCATION (coding, 0) != reg | |
1276 | && CODING_SPEC_ISO_INVOCATION (coding, 1) != reg) | |
1277 | { | |
1278 | /* Since the graphic register REG is not invoked to any graphic | |
1279 | planes, invoke it to graphic plane 0. */ | |
1280 | switch (reg) | |
1281 | { | |
1282 | case 0: /* graphic register 0 */ | |
1283 | ENCODE_SHIFT_IN; | |
1284 | break; | |
1285 | ||
1286 | case 1: /* graphic register 1 */ | |
1287 | ENCODE_SHIFT_OUT; | |
1288 | break; | |
1289 | ||
1290 | case 2: /* graphic register 2 */ | |
1291 | if (coding->flags & CODING_FLAG_ISO_SINGLE_SHIFT) | |
1292 | ENCODE_SINGLE_SHIFT_2; | |
1293 | else | |
1294 | ENCODE_LOCKING_SHIFT_2; | |
1295 | break; | |
1296 | ||
1297 | case 3: /* graphic register 3 */ | |
1298 | if (coding->flags & CODING_FLAG_ISO_SINGLE_SHIFT) | |
1299 | ENCODE_SINGLE_SHIFT_3; | |
1300 | else | |
1301 | ENCODE_LOCKING_SHIFT_3; | |
1302 | break; | |
1303 | } | |
1304 | } | |
1305 | return dst; | |
1306 | } | |
1307 | ||
1308 | /* The following two macros produce codes for indicating composition. */ | |
1309 | #define ENCODE_COMPOSITION_NO_RULE_START *dst++ = ISO_CODE_ESC, *dst++ = '0' | |
1310 | #define ENCODE_COMPOSITION_WITH_RULE_START *dst++ = ISO_CODE_ESC, *dst++ = '2' | |
1311 | #define ENCODE_COMPOSITION_END *dst++ = ISO_CODE_ESC, *dst++ = '1' | |
1312 | ||
1313 | /* The following three macros produce codes for indicating direction | |
1314 | of text. */ | |
1315 | #define ENCODE_CONTROL_SEQUENCE_INTRODUCER \ | |
1316 | do { \ | |
1317 | if (coding->flags == CODING_FLAG_ISO_SEVEN_BITS) \ | |
1318 | *dst++ = ISO_CODE_ESC, *dst++ = '['; \ | |
1319 | else \ | |
1320 | *dst++ = ISO_CODE_CSI; \ | |
1321 | } while (0) | |
1322 | ||
1323 | #define ENCODE_DIRECTION_R2L \ | |
1324 | ENCODE_CONTROL_SEQUENCE_INTRODUCER, *dst++ = '2', *dst++ = ']' | |
1325 | ||
1326 | #define ENCODE_DIRECTION_L2R \ | |
1327 | ENCODE_CONTROL_SEQUENCE_INTRODUCER, *dst++ = '0', *dst++ = ']' | |
1328 | ||
1329 | /* Produce codes for designation and invocation to reset the graphic | |
1330 | planes and registers to initial state. */ | |
e0e989f6 KH |
1331 | #define ENCODE_RESET_PLANE_AND_REGISTER \ |
1332 | do { \ | |
1333 | int reg; \ | |
1334 | if (CODING_SPEC_ISO_INVOCATION (coding, 0) != 0) \ | |
1335 | ENCODE_SHIFT_IN; \ | |
1336 | for (reg = 0; reg < 4; reg++) \ | |
1337 | if (CODING_SPEC_ISO_INITIAL_DESIGNATION (coding, reg) >= 0 \ | |
1338 | && (CODING_SPEC_ISO_DESIGNATION (coding, reg) \ | |
1339 | != CODING_SPEC_ISO_INITIAL_DESIGNATION (coding, reg))) \ | |
1340 | ENCODE_DESIGNATION \ | |
1341 | (CODING_SPEC_ISO_INITIAL_DESIGNATION (coding, reg), reg, coding); \ | |
4ed46869 KH |
1342 | } while (0) |
1343 | ||
bdd9fb48 KH |
1344 | /* Produce designation sequences of charsets in the line started from |
1345 | *SRC to a place pointed by DSTP. | |
1346 | ||
1347 | If the current block ends before any end-of-line, we may fail to | |
1348 | find all the necessary *designations. */ | |
1349 | encode_designation_at_bol (coding, table, src, src_end, dstp) | |
e0e989f6 | 1350 | struct coding_system *coding; |
bdd9fb48 | 1351 | Lisp_Object table; |
e0e989f6 KH |
1352 | unsigned char *src, *src_end, **dstp; |
1353 | { | |
bdd9fb48 KH |
1354 | int charset, c, found = 0, reg; |
1355 | /* Table of charsets to be designated to each graphic register. */ | |
1356 | int r[4]; | |
1357 | unsigned char *dst = *dstp; | |
1358 | ||
1359 | for (reg = 0; reg < 4; reg++) | |
1360 | r[reg] = -1; | |
1361 | ||
1362 | while (src < src_end && *src != '\n' && found < 4) | |
e0e989f6 | 1363 | { |
bdd9fb48 KH |
1364 | int bytes = BYTES_BY_CHAR_HEAD (*src); |
1365 | ||
1366 | if (NILP (table)) | |
1367 | charset = CHARSET_AT (src); | |
1368 | else | |
e0e989f6 | 1369 | { |
bdd9fb48 KH |
1370 | int c_alt, c1, c2; |
1371 | ||
1372 | SPLIT_STRING(src, bytes, charset, c1, c2); | |
1373 | if ((c_alt = unify_char (table, -1, charset, c1, c2)) >= 0) | |
1374 | charset = CHAR_CHARSET (c_alt); | |
e0e989f6 | 1375 | } |
bdd9fb48 | 1376 | |
e0e989f6 | 1377 | reg = CODING_SPEC_ISO_REQUESTED_DESIGNATION (coding, charset); |
1ba9e4ab | 1378 | if (r[reg] == CODING_SPEC_ISO_NO_REQUESTED_DESIGNATION) |
bdd9fb48 KH |
1379 | { |
1380 | found++; | |
1381 | r[reg] = charset; | |
1382 | } | |
1383 | ||
1384 | src += bytes; | |
1385 | } | |
1386 | ||
1387 | if (found) | |
1388 | { | |
1389 | for (reg = 0; reg < 4; reg++) | |
1390 | if (r[reg] >= 0 | |
1391 | && CODING_SPEC_ISO_DESIGNATION (coding, reg) != r[reg]) | |
1392 | ENCODE_DESIGNATION (r[reg], reg, coding); | |
1393 | *dstp = dst; | |
e0e989f6 | 1394 | } |
e0e989f6 KH |
1395 | } |
1396 | ||
4ed46869 KH |
1397 | /* See the above "GENERAL NOTES on `encode_coding_XXX ()' functions". */ |
1398 | ||
1399 | int | |
1400 | encode_coding_iso2022 (coding, source, destination, | |
1401 | src_bytes, dst_bytes, consumed) | |
1402 | struct coding_system *coding; | |
1403 | unsigned char *source, *destination; | |
1404 | int src_bytes, dst_bytes; | |
1405 | int *consumed; | |
1406 | { | |
1407 | unsigned char *src = source; | |
1408 | unsigned char *src_end = source + src_bytes; | |
1409 | unsigned char *dst = destination; | |
1410 | unsigned char *dst_end = destination + dst_bytes; | |
e0e989f6 | 1411 | /* Since the maximum bytes produced by each loop is 20, we subtract 19 |
4ed46869 KH |
1412 | from DST_END to assure overflow checking is necessary only at the |
1413 | head of loop. */ | |
e0e989f6 | 1414 | unsigned char *adjusted_dst_end = dst_end - 19; |
a5d301df KH |
1415 | Lisp_Object unification_table |
1416 | = coding->character_unification_table_for_encode; | |
bdd9fb48 KH |
1417 | |
1418 | if (!NILP (Venable_character_unification) && NILP (unification_table)) | |
a5d301df | 1419 | unification_table = Vstandard_character_unification_table_for_encode; |
4ed46869 KH |
1420 | |
1421 | while (src < src_end && dst < adjusted_dst_end) | |
1422 | { | |
1423 | /* SRC_BASE remembers the start position in source in each loop. | |
1424 | The loop will be exited when there's not enough source text | |
1425 | to analyze multi-byte codes (within macros ONE_MORE_BYTE, | |
1426 | TWO_MORE_BYTES, and THREE_MORE_BYTES). In that case, SRC is | |
1427 | reset to SRC_BASE before exiting. */ | |
1428 | unsigned char *src_base = src; | |
bdd9fb48 | 1429 | int charset, c1, c2, c3, c4; |
4ed46869 | 1430 | |
e0e989f6 KH |
1431 | if (coding->flags & CODING_FLAG_ISO_DESIGNATE_AT_BOL |
1432 | && CODING_SPEC_ISO_BOL (coding)) | |
1433 | { | |
bdd9fb48 KH |
1434 | /* We have to produce designation sequences if any now. */ |
1435 | encode_designation_at_bol (coding, unification_table, | |
1436 | src, src_end, &dst); | |
e0e989f6 KH |
1437 | CODING_SPEC_ISO_BOL (coding) = 0; |
1438 | } | |
1439 | ||
1440 | c1 = *src++; | |
4ed46869 KH |
1441 | /* If we are seeing a component of a composite character, we are |
1442 | seeing a leading-code specially encoded for composition, or a | |
1443 | composition rule if composing with rule. We must set C1 | |
1444 | to a normal leading-code or an ASCII code. If we are not at | |
1445 | a composed character, we must reset the composition state. */ | |
1446 | if (COMPOSING_P (coding->composing)) | |
1447 | { | |
1448 | if (c1 < 0xA0) | |
1449 | { | |
1450 | /* We are not in a composite character any longer. */ | |
1451 | coding->composing = COMPOSING_NO; | |
1452 | ENCODE_COMPOSITION_END; | |
1453 | } | |
1454 | else | |
1455 | { | |
1456 | if (coding->composing == COMPOSING_WITH_RULE_RULE) | |
1457 | { | |
1458 | *dst++ = c1 & 0x7F; | |
1459 | coding->composing = COMPOSING_WITH_RULE_HEAD; | |
1460 | continue; | |
1461 | } | |
1462 | else if (coding->composing == COMPOSING_WITH_RULE_HEAD) | |
1463 | coding->composing = COMPOSING_WITH_RULE_RULE; | |
1464 | if (c1 == 0xA0) | |
1465 | { | |
1466 | /* This is an ASCII component. */ | |
1467 | ONE_MORE_BYTE (c1); | |
1468 | c1 &= 0x7F; | |
1469 | } | |
1470 | else | |
1471 | /* This is a leading-code of non ASCII component. */ | |
1472 | c1 -= 0x20; | |
1473 | } | |
1474 | } | |
1475 | ||
1476 | /* Now encode one character. C1 is a control character, an | |
1477 | ASCII character, or a leading-code of multi-byte character. */ | |
1478 | switch (emacs_code_class[c1]) | |
1479 | { | |
1480 | case EMACS_ascii_code: | |
bdd9fb48 | 1481 | ENCODE_ISO_CHARACTER (CHARSET_ASCII, c1, /* dummy */ c2); |
4ed46869 KH |
1482 | break; |
1483 | ||
1484 | case EMACS_control_code: | |
1485 | if (coding->flags & CODING_FLAG_ISO_RESET_AT_CNTL) | |
e0e989f6 | 1486 | ENCODE_RESET_PLANE_AND_REGISTER; |
4ed46869 KH |
1487 | *dst++ = c1; |
1488 | break; | |
1489 | ||
1490 | case EMACS_carriage_return_code: | |
1491 | if (!coding->selective) | |
1492 | { | |
1493 | if (coding->flags & CODING_FLAG_ISO_RESET_AT_CNTL) | |
e0e989f6 | 1494 | ENCODE_RESET_PLANE_AND_REGISTER; |
4ed46869 KH |
1495 | *dst++ = c1; |
1496 | break; | |
1497 | } | |
1498 | /* fall down to treat '\r' as '\n' ... */ | |
1499 | ||
1500 | case EMACS_linefeed_code: | |
1501 | if (coding->flags & CODING_FLAG_ISO_RESET_AT_EOL) | |
e0e989f6 KH |
1502 | ENCODE_RESET_PLANE_AND_REGISTER; |
1503 | if (coding->flags & CODING_FLAG_ISO_INIT_AT_BOL) | |
1504 | bcopy (coding->spec.iso2022.initial_designation, | |
1505 | coding->spec.iso2022.current_designation, | |
1506 | sizeof coding->spec.iso2022.initial_designation); | |
4ed46869 | 1507 | if (coding->eol_type == CODING_EOL_LF |
0ef69138 | 1508 | || coding->eol_type == CODING_EOL_UNDECIDED) |
4ed46869 KH |
1509 | *dst++ = ISO_CODE_LF; |
1510 | else if (coding->eol_type == CODING_EOL_CRLF) | |
1511 | *dst++ = ISO_CODE_CR, *dst++ = ISO_CODE_LF; | |
1512 | else | |
1513 | *dst++ = ISO_CODE_CR; | |
e0e989f6 | 1514 | CODING_SPEC_ISO_BOL (coding) = 1; |
4ed46869 KH |
1515 | break; |
1516 | ||
1517 | case EMACS_leading_code_2: | |
1518 | ONE_MORE_BYTE (c2); | |
19a8d9e0 KH |
1519 | if (c2 < 0xA0) |
1520 | { | |
1521 | /* invalid sequence */ | |
1522 | *dst++ = c1; | |
1523 | *dst++ = c2; | |
1524 | } | |
1525 | else | |
1526 | ENCODE_ISO_CHARACTER (c1, c2, /* dummy */ c3); | |
4ed46869 KH |
1527 | break; |
1528 | ||
1529 | case EMACS_leading_code_3: | |
1530 | TWO_MORE_BYTES (c2, c3); | |
19a8d9e0 KH |
1531 | if (c2 < 0xA0 || c3 < 0xA0) |
1532 | { | |
1533 | /* invalid sequence */ | |
1534 | *dst++ = c1; | |
1535 | *dst++ = c2; | |
1536 | *dst++ = c3; | |
1537 | } | |
1538 | else if (c1 < LEADING_CODE_PRIVATE_11) | |
bdd9fb48 | 1539 | ENCODE_ISO_CHARACTER (c1, c2, c3); |
4ed46869 | 1540 | else |
bdd9fb48 | 1541 | ENCODE_ISO_CHARACTER (c2, c3, /* dummy */ c4); |
4ed46869 KH |
1542 | break; |
1543 | ||
1544 | case EMACS_leading_code_4: | |
1545 | THREE_MORE_BYTES (c2, c3, c4); | |
19a8d9e0 KH |
1546 | if (c2 < 0xA0 || c3 < 0xA0 || c4 < 0xA0) |
1547 | { | |
1548 | /* invalid sequence */ | |
1549 | *dst++ = c1; | |
1550 | *dst++ = c2; | |
1551 | *dst++ = c3; | |
1552 | *dst++ = c4; | |
1553 | } | |
1554 | else | |
1555 | ENCODE_ISO_CHARACTER (c2, c3, c4); | |
4ed46869 KH |
1556 | break; |
1557 | ||
1558 | case EMACS_leading_code_composition: | |
19a8d9e0 KH |
1559 | ONE_MORE_BYTE (c2); |
1560 | if (c2 < 0xA0) | |
1561 | { | |
1562 | /* invalid sequence */ | |
1563 | *dst++ = c1; | |
1564 | *dst++ = c2; | |
1565 | } | |
1566 | else if (c2 == 0xFF) | |
4ed46869 KH |
1567 | { |
1568 | coding->composing = COMPOSING_WITH_RULE_HEAD; | |
1569 | ENCODE_COMPOSITION_WITH_RULE_START; | |
1570 | } | |
1571 | else | |
1572 | { | |
1573 | /* Rewind one byte because it is a character code of | |
1574 | composition elements. */ | |
1575 | src--; | |
1576 | coding->composing = COMPOSING_NO_RULE_HEAD; | |
1577 | ENCODE_COMPOSITION_NO_RULE_START; | |
1578 | } | |
1579 | break; | |
1580 | ||
1581 | case EMACS_invalid_code: | |
1582 | *dst++ = c1; | |
1583 | break; | |
1584 | } | |
1585 | continue; | |
1586 | label_end_of_loop: | |
76376439 KH |
1587 | /* We reach here because the source date ends not at character |
1588 | boundary. */ | |
1589 | coding->carryover_size = src_end - src_base; | |
4ed46869 | 1590 | bcopy (src_base, coding->carryover, coding->carryover_size); |
76376439 | 1591 | src = src_end; |
4ed46869 KH |
1592 | break; |
1593 | } | |
1594 | ||
1595 | /* If this is the last block of the text to be encoded, we must | |
bdd9fb48 KH |
1596 | reset graphic planes and registers to the initial state. */ |
1597 | if (src >= src_end && coding->last_block) | |
4ed46869 | 1598 | { |
e0e989f6 | 1599 | ENCODE_RESET_PLANE_AND_REGISTER; |
bdd9fb48 KH |
1600 | if (coding->carryover_size > 0 |
1601 | && coding->carryover_size < (dst_end - dst)) | |
1602 | { | |
1603 | bcopy (coding->carryover, dst, coding->carryover_size); | |
1604 | dst += coding->carryover_size; | |
1605 | coding->carryover_size = 0; | |
1606 | } | |
4ed46869 KH |
1607 | } |
1608 | *consumed = src - source; | |
1609 | return dst - destination; | |
1610 | } | |
1611 | ||
1612 | \f | |
1613 | /*** 4. SJIS and BIG5 handlers ***/ | |
1614 | ||
f4dee582 | 1615 | /* Although SJIS and BIG5 are not ISO's coding system, they are used |
4ed46869 KH |
1616 | quite widely. So, for the moment, Emacs supports them in the bare |
1617 | C code. But, in the future, they may be supported only by CCL. */ | |
1618 | ||
1619 | /* SJIS is a coding system encoding three character sets: ASCII, right | |
1620 | half of JISX0201-Kana, and JISX0208. An ASCII character is encoded | |
1621 | as is. A character of charset katakana-jisx0201 is encoded by | |
1622 | "position-code + 0x80". A character of charset japanese-jisx0208 | |
1623 | is encoded in 2-byte but two position-codes are divided and shifted | |
1624 | so that it fit in the range below. | |
1625 | ||
1626 | --- CODE RANGE of SJIS --- | |
1627 | (character set) (range) | |
1628 | ASCII 0x00 .. 0x7F | |
1629 | KATAKANA-JISX0201 0xA0 .. 0xDF | |
1630 | JISX0208 (1st byte) 0x80 .. 0x9F and 0xE0 .. 0xFF | |
1631 | (2nd byte) 0x40 .. 0xFF | |
1632 | ------------------------------- | |
1633 | ||
1634 | */ | |
1635 | ||
1636 | /* BIG5 is a coding system encoding two character sets: ASCII and | |
1637 | Big5. An ASCII character is encoded as is. Big5 is a two-byte | |
1638 | character set and is encoded in two-byte. | |
1639 | ||
1640 | --- CODE RANGE of BIG5 --- | |
1641 | (character set) (range) | |
1642 | ASCII 0x00 .. 0x7F | |
1643 | Big5 (1st byte) 0xA1 .. 0xFE | |
1644 | (2nd byte) 0x40 .. 0x7E and 0xA1 .. 0xFE | |
1645 | -------------------------- | |
1646 | ||
1647 | Since the number of characters in Big5 is larger than maximum | |
1648 | characters in Emacs' charset (96x96), it can't be handled as one | |
1649 | charset. So, in Emacs, Big5 is divided into two: `charset-big5-1' | |
1650 | and `charset-big5-2'. Both are DIMENSION2 and CHARS94. The former | |
1651 | contains frequently used characters and the latter contains less | |
1652 | frequently used characters. */ | |
1653 | ||
1654 | /* Macros to decode or encode a character of Big5 in BIG5. B1 and B2 | |
1655 | are the 1st and 2nd position-codes of Big5 in BIG5 coding system. | |
1656 | C1 and C2 are the 1st and 2nd position-codes of of Emacs' internal | |
1657 | format. CHARSET is `charset_big5_1' or `charset_big5_2'. */ | |
1658 | ||
1659 | /* Number of Big5 characters which have the same code in 1st byte. */ | |
1660 | #define BIG5_SAME_ROW (0xFF - 0xA1 + 0x7F - 0x40) | |
1661 | ||
1662 | #define DECODE_BIG5(b1, b2, charset, c1, c2) \ | |
1663 | do { \ | |
1664 | unsigned int temp \ | |
1665 | = (b1 - 0xA1) * BIG5_SAME_ROW + b2 - (b2 < 0x7F ? 0x40 : 0x62); \ | |
1666 | if (b1 < 0xC9) \ | |
1667 | charset = charset_big5_1; \ | |
1668 | else \ | |
1669 | { \ | |
1670 | charset = charset_big5_2; \ | |
1671 | temp -= (0xC9 - 0xA1) * BIG5_SAME_ROW; \ | |
1672 | } \ | |
1673 | c1 = temp / (0xFF - 0xA1) + 0x21; \ | |
1674 | c2 = temp % (0xFF - 0xA1) + 0x21; \ | |
1675 | } while (0) | |
1676 | ||
1677 | #define ENCODE_BIG5(charset, c1, c2, b1, b2) \ | |
1678 | do { \ | |
1679 | unsigned int temp = (c1 - 0x21) * (0xFF - 0xA1) + (c2 - 0x21); \ | |
1680 | if (charset == charset_big5_2) \ | |
1681 | temp += BIG5_SAME_ROW * (0xC9 - 0xA1); \ | |
1682 | b1 = temp / BIG5_SAME_ROW + 0xA1; \ | |
1683 | b2 = temp % BIG5_SAME_ROW; \ | |
1684 | b2 += b2 < 0x3F ? 0x40 : 0x62; \ | |
1685 | } while (0) | |
1686 | ||
a5d301df KH |
1687 | #define DECODE_SJIS_BIG5_CHARACTER(charset, c1, c2) \ |
1688 | do { \ | |
1689 | int c_alt, charset_alt = (charset); \ | |
1690 | if (!NILP (unification_table) \ | |
1691 | && ((c_alt = unify_char (unification_table, \ | |
1692 | -1, (charset), c1, c2)) >= 0)) \ | |
1693 | SPLIT_CHAR (c_alt, charset_alt, c1, c2); \ | |
1694 | if (charset_alt == CHARSET_ASCII || charset_alt < 0) \ | |
1695 | DECODE_CHARACTER_ASCII (c1); \ | |
1696 | else if (CHARSET_DIMENSION (charset_alt) == 1) \ | |
1697 | DECODE_CHARACTER_DIMENSION1 (charset_alt, c1); \ | |
1698 | else \ | |
1699 | DECODE_CHARACTER_DIMENSION2 (charset_alt, c1, c2); \ | |
1700 | } while (0) | |
1701 | ||
1702 | #define ENCODE_SJIS_BIG5_CHARACTER(charset, c1, c2) \ | |
1703 | do { \ | |
1704 | int c_alt, charset_alt; \ | |
1705 | if (!NILP (unification_table) \ | |
1706 | && ((c_alt = unify_char (unification_table, -1, charset, c1, c2)) \ | |
1707 | >= 0)) \ | |
1708 | SPLIT_CHAR (c_alt, charset_alt, c1, c2); \ | |
1709 | else \ | |
1710 | charset_alt = charset; \ | |
1711 | if (charset_alt == charset_ascii) \ | |
1712 | *dst++ = c1; \ | |
1713 | else if (CHARSET_DIMENSION (charset_alt) == 1) \ | |
1714 | { \ | |
1715 | if (sjis_p && charset_alt == charset_katakana_jisx0201) \ | |
1716 | *dst++ = c1; \ | |
1717 | else \ | |
1718 | *dst++ = charset_alt, *dst++ = c1; \ | |
1719 | } \ | |
1720 | else \ | |
1721 | { \ | |
1722 | c1 &= 0x7F, c2 &= 0x7F; \ | |
1723 | if (sjis_p && charset_alt == charset_jisx0208) \ | |
1724 | { \ | |
1725 | unsigned char s1, s2; \ | |
1726 | \ | |
1727 | ENCODE_SJIS (c1, c2, s1, s2); \ | |
1728 | *dst++ = s1, *dst++ = s2; \ | |
1729 | } \ | |
1730 | else if (!sjis_p \ | |
1731 | && (charset_alt == charset_big5_1 \ | |
1732 | || charset_alt == charset_big5_2)) \ | |
1733 | { \ | |
1734 | unsigned char b1, b2; \ | |
1735 | \ | |
9ce27fde | 1736 | ENCODE_BIG5 (charset_alt, c1, c2, b1, b2); \ |
a5d301df KH |
1737 | *dst++ = b1, *dst++ = b2; \ |
1738 | } \ | |
1739 | else \ | |
1740 | *dst++ = charset_alt, *dst++ = c1, *dst++ = c2; \ | |
1741 | } \ | |
1742 | } while (0); | |
1743 | ||
4ed46869 KH |
1744 | /* See the above "GENERAL NOTES on `detect_coding_XXX ()' functions". |
1745 | Check if a text is encoded in SJIS. If it is, return | |
1746 | CODING_CATEGORY_MASK_SJIS, else return 0. */ | |
1747 | ||
1748 | int | |
1749 | detect_coding_sjis (src, src_end) | |
1750 | unsigned char *src, *src_end; | |
1751 | { | |
1752 | unsigned char c; | |
1753 | ||
1754 | while (src < src_end) | |
1755 | { | |
1756 | c = *src++; | |
1757 | if (c == ISO_CODE_ESC || c == ISO_CODE_SI || c == ISO_CODE_SO) | |
1758 | return 0; | |
1759 | if ((c >= 0x80 && c < 0xA0) || c >= 0xE0) | |
1760 | { | |
1761 | if (src < src_end && *src++ < 0x40) | |
1762 | return 0; | |
1763 | } | |
1764 | } | |
1765 | return CODING_CATEGORY_MASK_SJIS; | |
1766 | } | |
1767 | ||
1768 | /* See the above "GENERAL NOTES on `detect_coding_XXX ()' functions". | |
1769 | Check if a text is encoded in BIG5. If it is, return | |
1770 | CODING_CATEGORY_MASK_BIG5, else return 0. */ | |
1771 | ||
1772 | int | |
1773 | detect_coding_big5 (src, src_end) | |
1774 | unsigned char *src, *src_end; | |
1775 | { | |
1776 | unsigned char c; | |
1777 | ||
1778 | while (src < src_end) | |
1779 | { | |
1780 | c = *src++; | |
1781 | if (c == ISO_CODE_ESC || c == ISO_CODE_SI || c == ISO_CODE_SO) | |
1782 | return 0; | |
1783 | if (c >= 0xA1) | |
1784 | { | |
1785 | if (src >= src_end) | |
1786 | break; | |
1787 | c = *src++; | |
1788 | if (c < 0x40 || (c >= 0x7F && c <= 0xA0)) | |
1789 | return 0; | |
1790 | } | |
1791 | } | |
1792 | return CODING_CATEGORY_MASK_BIG5; | |
1793 | } | |
1794 | ||
1795 | /* See the above "GENERAL NOTES on `decode_coding_XXX ()' functions". | |
1796 | If SJIS_P is 1, decode SJIS text, else decode BIG5 test. */ | |
1797 | ||
1798 | int | |
1799 | decode_coding_sjis_big5 (coding, source, destination, | |
1800 | src_bytes, dst_bytes, consumed, sjis_p) | |
1801 | struct coding_system *coding; | |
1802 | unsigned char *source, *destination; | |
1803 | int src_bytes, dst_bytes; | |
1804 | int *consumed; | |
1805 | int sjis_p; | |
1806 | { | |
1807 | unsigned char *src = source; | |
1808 | unsigned char *src_end = source + src_bytes; | |
1809 | unsigned char *dst = destination; | |
1810 | unsigned char *dst_end = destination + dst_bytes; | |
1811 | /* Since the maximum bytes produced by each loop is 4, we subtract 3 | |
1812 | from DST_END to assure overflow checking is necessary only at the | |
1813 | head of loop. */ | |
1814 | unsigned char *adjusted_dst_end = dst_end - 3; | |
a5d301df KH |
1815 | Lisp_Object unification_table |
1816 | = coding->character_unification_table_for_decode; | |
1817 | ||
1818 | if (!NILP (Venable_character_unification) && NILP (unification_table)) | |
1819 | unification_table = Vstandard_character_unification_table_for_decode; | |
4ed46869 KH |
1820 | |
1821 | while (src < src_end && dst < adjusted_dst_end) | |
1822 | { | |
1823 | /* SRC_BASE remembers the start position in source in each loop. | |
1824 | The loop will be exited when there's not enough source text | |
1825 | to analyze two-byte character (within macro ONE_MORE_BYTE). | |
1826 | In that case, SRC is reset to SRC_BASE before exiting. */ | |
1827 | unsigned char *src_base = src; | |
1828 | unsigned char c1 = *src++, c2, c3, c4; | |
1829 | ||
1830 | if (c1 == '\r') | |
1831 | { | |
1832 | if (coding->eol_type == CODING_EOL_CRLF) | |
1833 | { | |
1834 | ONE_MORE_BYTE (c2); | |
1835 | if (c2 == '\n') | |
1836 | *dst++ = c2; | |
1837 | else | |
1838 | /* To process C2 again, SRC is subtracted by 1. */ | |
1839 | *dst++ = c1, src--; | |
1840 | } | |
1841 | else | |
1842 | *dst++ = c1; | |
1843 | } | |
a5d301df | 1844 | else if (c1 < 0x20) |
4ed46869 | 1845 | *dst++ = c1; |
a5d301df KH |
1846 | else if (c1 < 0x80) |
1847 | DECODE_SJIS_BIG5_CHARACTER (charset_ascii, c1, /* dummy */ c2); | |
4ed46869 KH |
1848 | else if (c1 < 0xA0 || c1 >= 0xE0) |
1849 | { | |
1850 | /* SJIS -> JISX0208, BIG5 -> Big5 (only if 0xE0 <= c1 < 0xFF) */ | |
1851 | if (sjis_p) | |
1852 | { | |
1853 | ONE_MORE_BYTE (c2); | |
1854 | DECODE_SJIS (c1, c2, c3, c4); | |
a5d301df | 1855 | DECODE_SJIS_BIG5_CHARACTER (charset_jisx0208, c3, c4); |
4ed46869 KH |
1856 | } |
1857 | else if (c1 >= 0xE0 && c1 < 0xFF) | |
1858 | { | |
1859 | int charset; | |
1860 | ||
1861 | ONE_MORE_BYTE (c2); | |
1862 | DECODE_BIG5 (c1, c2, charset, c3, c4); | |
a5d301df | 1863 | DECODE_SJIS_BIG5_CHARACTER (charset, c3, c4); |
4ed46869 KH |
1864 | } |
1865 | else /* Invalid code */ | |
1866 | *dst++ = c1; | |
1867 | } | |
1868 | else | |
1869 | { | |
1870 | /* SJIS -> JISX0201-Kana, BIG5 -> Big5 */ | |
1871 | if (sjis_p) | |
a5d301df | 1872 | DECODE_SJIS_BIG5_CHARACTER (charset_katakana_jisx0201, c1, /* dummy */ c2); |
4ed46869 KH |
1873 | else |
1874 | { | |
1875 | int charset; | |
1876 | ||
1877 | ONE_MORE_BYTE (c2); | |
1878 | DECODE_BIG5 (c1, c2, charset, c3, c4); | |
a5d301df | 1879 | DECODE_SJIS_BIG5_CHARACTER (charset, c3, c4); |
4ed46869 KH |
1880 | } |
1881 | } | |
1882 | continue; | |
1883 | ||
1884 | label_end_of_loop: | |
1885 | coding->carryover_size = src - src_base; | |
1886 | bcopy (src_base, coding->carryover, coding->carryover_size); | |
1887 | src = src_base; | |
1888 | break; | |
1889 | } | |
1890 | ||
1891 | *consumed = src - source; | |
1892 | return dst - destination; | |
1893 | } | |
1894 | ||
1895 | /* See the above "GENERAL NOTES on `encode_coding_XXX ()' functions". | |
1896 | This function can encode `charset_ascii', `charset_katakana_jisx0201', | |
1897 | `charset_jisx0208', `charset_big5_1', and `charset_big5-2'. We are | |
1898 | sure that all these charsets are registered as official charset | |
1899 | (i.e. do not have extended leading-codes). Characters of other | |
1900 | charsets are produced without any encoding. If SJIS_P is 1, encode | |
1901 | SJIS text, else encode BIG5 text. */ | |
1902 | ||
1903 | int | |
1904 | encode_coding_sjis_big5 (coding, source, destination, | |
1905 | src_bytes, dst_bytes, consumed, sjis_p) | |
1906 | struct coding_system *coding; | |
1907 | unsigned char *source, *destination; | |
1908 | int src_bytes, dst_bytes; | |
1909 | int *consumed; | |
1910 | int sjis_p; | |
1911 | { | |
1912 | unsigned char *src = source; | |
1913 | unsigned char *src_end = source + src_bytes; | |
1914 | unsigned char *dst = destination; | |
1915 | unsigned char *dst_end = destination + dst_bytes; | |
1916 | /* Since the maximum bytes produced by each loop is 2, we subtract 1 | |
1917 | from DST_END to assure overflow checking is necessary only at the | |
1918 | head of loop. */ | |
1919 | unsigned char *adjusted_dst_end = dst_end - 1; | |
a5d301df KH |
1920 | Lisp_Object unification_table |
1921 | = coding->character_unification_table_for_encode; | |
1922 | ||
1923 | if (!NILP (Venable_character_unification) && NILP (unification_table)) | |
1924 | unification_table = Vstandard_character_unification_table_for_encode; | |
4ed46869 KH |
1925 | |
1926 | while (src < src_end && dst < adjusted_dst_end) | |
1927 | { | |
1928 | /* SRC_BASE remembers the start position in source in each loop. | |
1929 | The loop will be exited when there's not enough source text | |
1930 | to analyze multi-byte codes (within macros ONE_MORE_BYTE and | |
1931 | TWO_MORE_BYTES). In that case, SRC is reset to SRC_BASE | |
1932 | before exiting. */ | |
1933 | unsigned char *src_base = src; | |
1934 | unsigned char c1 = *src++, c2, c3, c4; | |
1935 | ||
1936 | if (coding->composing) | |
1937 | { | |
1938 | if (c1 == 0xA0) | |
1939 | { | |
1940 | ONE_MORE_BYTE (c1); | |
1941 | c1 &= 0x7F; | |
1942 | } | |
1943 | else if (c1 >= 0xA0) | |
1944 | c1 -= 0x20; | |
1945 | else | |
1946 | coding->composing = 0; | |
1947 | } | |
1948 | ||
1949 | switch (emacs_code_class[c1]) | |
1950 | { | |
1951 | case EMACS_ascii_code: | |
a5d301df KH |
1952 | ENCODE_SJIS_BIG5_CHARACTER (charset_ascii, c1, /* dummy */ c2); |
1953 | break; | |
1954 | ||
4ed46869 KH |
1955 | case EMACS_control_code: |
1956 | *dst++ = c1; | |
1957 | break; | |
1958 | ||
1959 | case EMACS_carriage_return_code: | |
1960 | if (!coding->selective) | |
1961 | { | |
1962 | *dst++ = c1; | |
1963 | break; | |
1964 | } | |
1965 | /* fall down to treat '\r' as '\n' ... */ | |
1966 | ||
1967 | case EMACS_linefeed_code: | |
1968 | if (coding->eol_type == CODING_EOL_LF | |
0ef69138 | 1969 | || coding->eol_type == CODING_EOL_UNDECIDED) |
4ed46869 KH |
1970 | *dst++ = '\n'; |
1971 | else if (coding->eol_type == CODING_EOL_CRLF) | |
1972 | *dst++ = '\r', *dst++ = '\n'; | |
1973 | else | |
1974 | *dst++ = '\r'; | |
1975 | break; | |
1976 | ||
1977 | case EMACS_leading_code_2: | |
1978 | ONE_MORE_BYTE (c2); | |
a5d301df | 1979 | ENCODE_SJIS_BIG5_CHARACTER (c1, c2, /* dummy */ c3); |
4ed46869 KH |
1980 | break; |
1981 | ||
1982 | case EMACS_leading_code_3: | |
1983 | TWO_MORE_BYTES (c2, c3); | |
a5d301df | 1984 | ENCODE_SJIS_BIG5_CHARACTER (c1, c2, c3); |
4ed46869 KH |
1985 | break; |
1986 | ||
1987 | case EMACS_leading_code_4: | |
1988 | THREE_MORE_BYTES (c2, c3, c4); | |
a5d301df | 1989 | ENCODE_SJIS_BIG5_CHARACTER (c2, c3, c4); |
4ed46869 KH |
1990 | break; |
1991 | ||
1992 | case EMACS_leading_code_composition: | |
1993 | coding->composing = 1; | |
1994 | break; | |
1995 | ||
1996 | default: /* i.e. case EMACS_invalid_code: */ | |
1997 | *dst++ = c1; | |
1998 | } | |
1999 | continue; | |
2000 | ||
2001 | label_end_of_loop: | |
76376439 | 2002 | coding->carryover_size = src_end - src_base; |
4ed46869 | 2003 | bcopy (src_base, coding->carryover, coding->carryover_size); |
76376439 | 2004 | src = src_end; |
4ed46869 KH |
2005 | break; |
2006 | } | |
2007 | ||
2008 | *consumed = src - source; | |
2009 | return dst - destination; | |
2010 | } | |
2011 | ||
2012 | \f | |
2013 | /*** 5. End-of-line handlers ***/ | |
2014 | ||
2015 | /* See the above "GENERAL NOTES on `decode_coding_XXX ()' functions". | |
2016 | This function is called only when `coding->eol_type' is | |
2017 | CODING_EOL_CRLF or CODING_EOL_CR. */ | |
2018 | ||
2019 | decode_eol (coding, source, destination, src_bytes, dst_bytes, consumed) | |
2020 | struct coding_system *coding; | |
2021 | unsigned char *source, *destination; | |
2022 | int src_bytes, dst_bytes; | |
2023 | int *consumed; | |
2024 | { | |
2025 | unsigned char *src = source; | |
2026 | unsigned char *src_end = source + src_bytes; | |
2027 | unsigned char *dst = destination; | |
2028 | unsigned char *dst_end = destination + dst_bytes; | |
2029 | int produced; | |
2030 | ||
2031 | switch (coding->eol_type) | |
2032 | { | |
2033 | case CODING_EOL_CRLF: | |
2034 | { | |
2035 | /* Since the maximum bytes produced by each loop is 2, we | |
2036 | subtract 1 from DST_END to assure overflow checking is | |
2037 | necessary only at the head of loop. */ | |
2038 | unsigned char *adjusted_dst_end = dst_end - 1; | |
2039 | ||
2040 | while (src < src_end && dst < adjusted_dst_end) | |
2041 | { | |
2042 | unsigned char *src_base = src; | |
2043 | unsigned char c = *src++; | |
2044 | if (c == '\r') | |
2045 | { | |
2046 | ONE_MORE_BYTE (c); | |
2047 | if (c != '\n') | |
2048 | *dst++ = '\r'; | |
bfd99048 | 2049 | *dst++ = c; |
4ed46869 KH |
2050 | } |
2051 | else | |
2052 | *dst++ = c; | |
2053 | continue; | |
2054 | ||
2055 | label_end_of_loop: | |
2056 | coding->carryover_size = src - src_base; | |
2057 | bcopy (src_base, coding->carryover, coding->carryover_size); | |
2058 | src = src_base; | |
2059 | break; | |
2060 | } | |
2061 | *consumed = src - source; | |
2062 | produced = dst - destination; | |
2063 | break; | |
2064 | } | |
2065 | ||
2066 | case CODING_EOL_CR: | |
2067 | produced = (src_bytes > dst_bytes) ? dst_bytes : src_bytes; | |
2068 | bcopy (source, destination, produced); | |
2069 | dst_end = destination + produced; | |
2070 | while (dst < dst_end) | |
2071 | if (*dst++ == '\r') dst[-1] = '\n'; | |
2072 | *consumed = produced; | |
2073 | break; | |
2074 | ||
2075 | default: /* i.e. case: CODING_EOL_LF */ | |
2076 | produced = (src_bytes > dst_bytes) ? dst_bytes : src_bytes; | |
2077 | bcopy (source, destination, produced); | |
2078 | *consumed = produced; | |
2079 | break; | |
2080 | } | |
2081 | ||
2082 | return produced; | |
2083 | } | |
2084 | ||
2085 | /* See "GENERAL NOTES about `encode_coding_XXX ()' functions". Encode | |
2086 | format of end-of-line according to `coding->eol_type'. If | |
2087 | `coding->selective' is 1, code '\r' in source text also means | |
2088 | end-of-line. */ | |
2089 | ||
2090 | encode_eol (coding, source, destination, src_bytes, dst_bytes, consumed) | |
2091 | struct coding_system *coding; | |
2092 | unsigned char *source, *destination; | |
2093 | int src_bytes, dst_bytes; | |
2094 | int *consumed; | |
2095 | { | |
2096 | unsigned char *src = source; | |
2097 | unsigned char *dst = destination; | |
2098 | int produced; | |
2099 | ||
2100 | if (src_bytes <= 0) | |
2101 | return 0; | |
2102 | ||
2103 | switch (coding->eol_type) | |
2104 | { | |
2105 | case CODING_EOL_LF: | |
0ef69138 | 2106 | case CODING_EOL_UNDECIDED: |
4ed46869 KH |
2107 | produced = (src_bytes > dst_bytes) ? dst_bytes : src_bytes; |
2108 | bcopy (source, destination, produced); | |
2109 | if (coding->selective) | |
2110 | { | |
2111 | int i = produced; | |
2112 | while (i--) | |
2113 | if (*dst++ == '\r') dst[-1] = '\n'; | |
2114 | } | |
2115 | *consumed = produced; | |
2116 | ||
2117 | case CODING_EOL_CRLF: | |
2118 | { | |
2119 | unsigned char c; | |
2120 | unsigned char *src_end = source + src_bytes; | |
2121 | unsigned char *dst_end = destination + dst_bytes; | |
2122 | /* Since the maximum bytes produced by each loop is 2, we | |
2123 | subtract 1 from DST_END to assure overflow checking is | |
2124 | necessary only at the head of loop. */ | |
2125 | unsigned char *adjusted_dst_end = dst_end - 1; | |
2126 | ||
2127 | while (src < src_end && dst < adjusted_dst_end) | |
2128 | { | |
2129 | c = *src++; | |
2130 | if (c == '\n' || (c == '\r' && coding->selective)) | |
2131 | *dst++ = '\r', *dst++ = '\n'; | |
2132 | else | |
2133 | *dst++ = c; | |
2134 | } | |
2135 | produced = dst - destination; | |
2136 | *consumed = src - source; | |
2137 | break; | |
2138 | } | |
2139 | ||
2140 | default: /* i.e. case CODING_EOL_CR: */ | |
2141 | produced = (src_bytes > dst_bytes) ? dst_bytes : src_bytes; | |
2142 | bcopy (source, destination, produced); | |
2143 | { | |
2144 | int i = produced; | |
2145 | while (i--) | |
2146 | if (*dst++ == '\n') dst[-1] = '\r'; | |
2147 | } | |
2148 | *consumed = produced; | |
2149 | } | |
2150 | ||
2151 | return produced; | |
2152 | } | |
2153 | ||
2154 | \f | |
2155 | /*** 6. C library functions ***/ | |
2156 | ||
2157 | /* In Emacs Lisp, coding system is represented by a Lisp symbol which | |
2158 | has a property `coding-system'. The value of this property is a | |
2159 | vector of length 5 (called as coding-vector). Among elements of | |
2160 | this vector, the first (element[0]) and the fifth (element[4]) | |
2161 | carry important information for decoding/encoding. Before | |
2162 | decoding/encoding, this information should be set in fields of a | |
2163 | structure of type `coding_system'. | |
2164 | ||
2165 | A value of property `coding-system' can be a symbol of another | |
2166 | subsidiary coding-system. In that case, Emacs gets coding-vector | |
2167 | from that symbol. | |
2168 | ||
2169 | `element[0]' contains information to be set in `coding->type'. The | |
2170 | value and its meaning is as follows: | |
2171 | ||
0ef69138 KH |
2172 | 0 -- coding_type_emacs_mule |
2173 | 1 -- coding_type_sjis | |
2174 | 2 -- coding_type_iso2022 | |
2175 | 3 -- coding_type_big5 | |
2176 | 4 -- coding_type_ccl encoder/decoder written in CCL | |
2177 | nil -- coding_type_no_conversion | |
2178 | t -- coding_type_undecided (automatic conversion on decoding, | |
2179 | no-conversion on encoding) | |
4ed46869 KH |
2180 | |
2181 | `element[4]' contains information to be set in `coding->flags' and | |
2182 | `coding->spec'. The meaning varies by `coding->type'. | |
2183 | ||
2184 | If `coding->type' is `coding_type_iso2022', element[4] is a vector | |
2185 | of length 32 (of which the first 13 sub-elements are used now). | |
2186 | Meanings of these sub-elements are: | |
2187 | ||
2188 | sub-element[N] where N is 0 through 3: to be set in `coding->spec.iso2022' | |
2189 | If the value is an integer of valid charset, the charset is | |
2190 | assumed to be designated to graphic register N initially. | |
2191 | ||
2192 | If the value is minus, it is a minus value of charset which | |
2193 | reserves graphic register N, which means that the charset is | |
2194 | not designated initially but should be designated to graphic | |
2195 | register N just before encoding a character in that charset. | |
2196 | ||
2197 | If the value is nil, graphic register N is never used on | |
2198 | encoding. | |
2199 | ||
2200 | sub-element[N] where N is 4 through 11: to be set in `coding->flags' | |
2201 | Each value takes t or nil. See the section ISO2022 of | |
2202 | `coding.h' for more information. | |
2203 | ||
2204 | If `coding->type' is `coding_type_big5', element[4] is t to denote | |
2205 | BIG5-ETen or nil to denote BIG5-HKU. | |
2206 | ||
2207 | If `coding->type' takes the other value, element[4] is ignored. | |
2208 | ||
2209 | Emacs Lisp's coding system also carries information about format of | |
2210 | end-of-line in a value of property `eol-type'. If the value is | |
2211 | integer, 0 means CODING_EOL_LF, 1 means CODING_EOL_CRLF, and 2 | |
2212 | means CODING_EOL_CR. If it is not integer, it should be a vector | |
2213 | of subsidiary coding systems of which property `eol-type' has one | |
2214 | of above values. | |
2215 | ||
2216 | */ | |
2217 | ||
2218 | /* Extract information for decoding/encoding from CODING_SYSTEM_SYMBOL | |
2219 | and set it in CODING. If CODING_SYSTEM_SYMBOL is invalid, CODING | |
2220 | is setup so that no conversion is necessary and return -1, else | |
2221 | return 0. */ | |
2222 | ||
2223 | int | |
e0e989f6 KH |
2224 | setup_coding_system (coding_system, coding) |
2225 | Lisp_Object coding_system; | |
4ed46869 KH |
2226 | struct coding_system *coding; |
2227 | { | |
4ed46869 KH |
2228 | Lisp_Object type, eol_type; |
2229 | ||
f4dee582 | 2230 | /* At first, set several fields to default values. */ |
4ed46869 KH |
2231 | coding->require_flushing = 0; |
2232 | coding->last_block = 0; | |
2233 | coding->selective = 0; | |
2234 | coding->composing = 0; | |
2235 | coding->direction = 0; | |
2236 | coding->carryover_size = 0; | |
4ed46869 | 2237 | coding->post_read_conversion = coding->pre_write_conversion = Qnil; |
a5d301df KH |
2238 | coding->character_unification_table_for_decode = Qnil; |
2239 | coding->character_unification_table_for_encode = Qnil; | |
4ed46869 | 2240 | |
e0e989f6 KH |
2241 | Vlast_coding_system_used = coding->symbol = coding_system; |
2242 | eol_type = Qnil; | |
2243 | /* Get value of property `coding-system' until we get a vector. | |
2244 | While doing that, also get values of properties | |
a5d301df KH |
2245 | `post-read-conversion', `pre-write-conversion', |
2246 | `character-unification-table-for-decode', | |
2247 | `character-unification-table-for-encode' and `eol-type'. */ | |
e0e989f6 | 2248 | while (!NILP (coding_system) && SYMBOLP (coding_system)) |
4ed46869 | 2249 | { |
4ed46869 | 2250 | if (NILP (coding->post_read_conversion)) |
e0e989f6 | 2251 | coding->post_read_conversion = Fget (coding_system, |
4ed46869 | 2252 | Qpost_read_conversion); |
e0e989f6 KH |
2253 | if (NILP (coding->pre_write_conversion)) |
2254 | coding->pre_write_conversion = Fget (coding_system, | |
4ed46869 | 2255 | Qpre_write_conversion); |
9ce27fde | 2256 | if (!inhibit_eol_conversion && NILP (eol_type)) |
e0e989f6 | 2257 | eol_type = Fget (coding_system, Qeol_type); |
a5d301df KH |
2258 | |
2259 | if (NILP (coding->character_unification_table_for_decode)) | |
2260 | coding->character_unification_table_for_decode | |
2261 | = Fget (coding_system, Qcharacter_unification_table_for_decode); | |
2262 | ||
2263 | if (NILP (coding->character_unification_table_for_encode)) | |
2264 | coding->character_unification_table_for_encode | |
2265 | = Fget (coding_system, Qcharacter_unification_table_for_encode); | |
2266 | ||
e0e989f6 | 2267 | coding_system = Fget (coding_system, Qcoding_system); |
4ed46869 | 2268 | } |
a5d301df KH |
2269 | |
2270 | while (!NILP (coding->character_unification_table_for_decode) | |
2271 | && SYMBOLP (coding->character_unification_table_for_decode)) | |
2272 | coding->character_unification_table_for_decode | |
2273 | = Fget (coding->character_unification_table_for_decode, | |
2274 | Qcharacter_unification_table_for_decode); | |
2275 | if (!NILP (coding->character_unification_table_for_decode) | |
2276 | && !CHAR_TABLE_P (coding->character_unification_table_for_decode)) | |
2277 | coding->character_unification_table_for_decode = Qnil; | |
2278 | ||
2279 | while (!NILP (coding->character_unification_table_for_encode) | |
2280 | && SYMBOLP (coding->character_unification_table_for_encode)) | |
2281 | coding->character_unification_table_for_encode | |
2282 | = Fget (coding->character_unification_table_for_encode, | |
2283 | Qcharacter_unification_table_for_encode); | |
2284 | if (!NILP (coding->character_unification_table_for_encode) | |
2285 | && !CHAR_TABLE_P (coding->character_unification_table_for_encode)) | |
2286 | coding->character_unification_table_for_encode = Qnil; | |
2287 | ||
e0e989f6 KH |
2288 | if (!VECTORP (coding_system) |
2289 | || XVECTOR (coding_system)->size != 5) | |
4ed46869 KH |
2290 | goto label_invalid_coding_system; |
2291 | ||
4ed46869 | 2292 | if (VECTORP (eol_type)) |
0ef69138 | 2293 | coding->eol_type = CODING_EOL_UNDECIDED; |
4ed46869 KH |
2294 | else if (XFASTINT (eol_type) == 1) |
2295 | coding->eol_type = CODING_EOL_CRLF; | |
2296 | else if (XFASTINT (eol_type) == 2) | |
2297 | coding->eol_type = CODING_EOL_CR; | |
2298 | else | |
2299 | coding->eol_type = CODING_EOL_LF; | |
2300 | ||
e0e989f6 | 2301 | type = XVECTOR (coding_system)->contents[0]; |
4ed46869 KH |
2302 | switch (XFASTINT (type)) |
2303 | { | |
2304 | case 0: | |
0ef69138 | 2305 | coding->type = coding_type_emacs_mule; |
4ed46869 KH |
2306 | break; |
2307 | ||
2308 | case 1: | |
2309 | coding->type = coding_type_sjis; | |
2310 | break; | |
2311 | ||
2312 | case 2: | |
2313 | coding->type = coding_type_iso2022; | |
2314 | { | |
e0e989f6 | 2315 | Lisp_Object val = XVECTOR (coding_system)->contents[4]; |
4ed46869 KH |
2316 | Lisp_Object *flags; |
2317 | int i, charset, default_reg_bits = 0; | |
2318 | ||
2319 | if (!VECTORP (val) || XVECTOR (val)->size != 32) | |
2320 | goto label_invalid_coding_system; | |
2321 | ||
2322 | flags = XVECTOR (val)->contents; | |
2323 | coding->flags | |
2324 | = ((NILP (flags[4]) ? 0 : CODING_FLAG_ISO_SHORT_FORM) | |
2325 | | (NILP (flags[5]) ? 0 : CODING_FLAG_ISO_RESET_AT_EOL) | |
2326 | | (NILP (flags[6]) ? 0 : CODING_FLAG_ISO_RESET_AT_CNTL) | |
2327 | | (NILP (flags[7]) ? 0 : CODING_FLAG_ISO_SEVEN_BITS) | |
2328 | | (NILP (flags[8]) ? 0 : CODING_FLAG_ISO_LOCKING_SHIFT) | |
2329 | | (NILP (flags[9]) ? 0 : CODING_FLAG_ISO_SINGLE_SHIFT) | |
2330 | | (NILP (flags[10]) ? 0 : CODING_FLAG_ISO_USE_ROMAN) | |
2331 | | (NILP (flags[11]) ? 0 : CODING_FLAG_ISO_USE_OLDJIS) | |
e0e989f6 KH |
2332 | | (NILP (flags[12]) ? 0 : CODING_FLAG_ISO_NO_DIRECTION) |
2333 | | (NILP (flags[13]) ? 0 : CODING_FLAG_ISO_INIT_AT_BOL) | |
2334 | | (NILP (flags[14]) ? 0 : CODING_FLAG_ISO_DESIGNATE_AT_BOL)); | |
4ed46869 KH |
2335 | |
2336 | /* Invoke graphic register 0 to plane 0. */ | |
2337 | CODING_SPEC_ISO_INVOCATION (coding, 0) = 0; | |
2338 | /* Invoke graphic register 1 to plane 1 if we can use full 8-bit. */ | |
2339 | CODING_SPEC_ISO_INVOCATION (coding, 1) | |
2340 | = (coding->flags & CODING_FLAG_ISO_SEVEN_BITS ? -1 : 1); | |
2341 | /* Not single shifting at first. */ | |
2342 | CODING_SPEC_ISO_SINGLE_SHIFTING(coding) = 0; | |
e0e989f6 KH |
2343 | /* Beginning of buffer should also be regarded as bol. */ |
2344 | CODING_SPEC_ISO_BOL(coding) = 1; | |
4ed46869 KH |
2345 | |
2346 | /* Checks FLAGS[REG] (REG = 0, 1, 2 3) and decide designations. | |
2347 | FLAGS[REG] can be one of below: | |
2348 | integer CHARSET: CHARSET occupies register I, | |
2349 | t: designate nothing to REG initially, but can be used | |
2350 | by any charsets, | |
2351 | list of integer, nil, or t: designate the first | |
2352 | element (if integer) to REG initially, the remaining | |
2353 | elements (if integer) is designated to REG on request, | |
2354 | if an element is t, REG can be used by any charset, | |
2355 | nil: REG is never used. */ | |
467e7675 | 2356 | for (charset = 0; charset <= MAX_CHARSET; charset++) |
1ba9e4ab KH |
2357 | CODING_SPEC_ISO_REQUESTED_DESIGNATION (coding, charset) |
2358 | = CODING_SPEC_ISO_NO_REQUESTED_DESIGNATION; | |
4ed46869 KH |
2359 | for (i = 0; i < 4; i++) |
2360 | { | |
2361 | if (INTEGERP (flags[i]) | |
e0e989f6 KH |
2362 | && (charset = XINT (flags[i]), CHARSET_VALID_P (charset)) |
2363 | || (charset = get_charset_id (flags[i])) >= 0) | |
4ed46869 KH |
2364 | { |
2365 | CODING_SPEC_ISO_INITIAL_DESIGNATION (coding, i) = charset; | |
2366 | CODING_SPEC_ISO_REQUESTED_DESIGNATION (coding, charset) = i; | |
2367 | } | |
2368 | else if (EQ (flags[i], Qt)) | |
2369 | { | |
2370 | CODING_SPEC_ISO_INITIAL_DESIGNATION (coding, i) = -1; | |
2371 | default_reg_bits |= 1 << i; | |
2372 | } | |
2373 | else if (CONSP (flags[i])) | |
2374 | { | |
2375 | Lisp_Object tail = flags[i]; | |
2376 | ||
2377 | if (INTEGERP (XCONS (tail)->car) | |
2378 | && (charset = XINT (XCONS (tail)->car), | |
e0e989f6 KH |
2379 | CHARSET_VALID_P (charset)) |
2380 | || (charset = get_charset_id (XCONS (tail)->car)) >= 0) | |
4ed46869 KH |
2381 | { |
2382 | CODING_SPEC_ISO_INITIAL_DESIGNATION (coding, i) = charset; | |
2383 | CODING_SPEC_ISO_REQUESTED_DESIGNATION (coding, charset) =i; | |
2384 | } | |
2385 | else | |
2386 | CODING_SPEC_ISO_INITIAL_DESIGNATION (coding, i) = -1; | |
2387 | tail = XCONS (tail)->cdr; | |
2388 | while (CONSP (tail)) | |
2389 | { | |
2390 | if (INTEGERP (XCONS (tail)->car) | |
2391 | && (charset = XINT (XCONS (tail)->car), | |
e0e989f6 KH |
2392 | CHARSET_VALID_P (charset)) |
2393 | || (charset = get_charset_id (XCONS (tail)->car)) >= 0) | |
4ed46869 KH |
2394 | CODING_SPEC_ISO_REQUESTED_DESIGNATION (coding, charset) |
2395 | = i; | |
2396 | else if (EQ (XCONS (tail)->car, Qt)) | |
2397 | default_reg_bits |= 1 << i; | |
2398 | tail = XCONS (tail)->cdr; | |
2399 | } | |
2400 | } | |
2401 | else | |
2402 | CODING_SPEC_ISO_INITIAL_DESIGNATION (coding, i) = -1; | |
2403 | ||
2404 | CODING_SPEC_ISO_DESIGNATION (coding, i) | |
2405 | = CODING_SPEC_ISO_INITIAL_DESIGNATION (coding, i); | |
2406 | } | |
2407 | ||
2408 | if (! (coding->flags & CODING_FLAG_ISO_LOCKING_SHIFT)) | |
2409 | { | |
2410 | /* REG 1 can be used only by locking shift in 7-bit env. */ | |
2411 | if (coding->flags & CODING_FLAG_ISO_SEVEN_BITS) | |
2412 | default_reg_bits &= ~2; | |
2413 | if (! (coding->flags & CODING_FLAG_ISO_SINGLE_SHIFT)) | |
2414 | /* Without any shifting, only REG 0 and 1 can be used. */ | |
2415 | default_reg_bits &= 3; | |
2416 | } | |
2417 | ||
467e7675 | 2418 | for (charset = 0; charset <= MAX_CHARSET; charset++) |
4ed46869 | 2419 | if (CHARSET_VALID_P (charset) |
1ba9e4ab KH |
2420 | && (CODING_SPEC_ISO_REQUESTED_DESIGNATION (coding, charset) |
2421 | == CODING_SPEC_ISO_NO_REQUESTED_DESIGNATION)) | |
4ed46869 KH |
2422 | { |
2423 | /* We have not yet decided where to designate CHARSET. */ | |
2424 | int reg_bits = default_reg_bits; | |
2425 | ||
2426 | if (CHARSET_CHARS (charset) == 96) | |
2427 | /* A charset of CHARS96 can't be designated to REG 0. */ | |
2428 | reg_bits &= ~1; | |
2429 | ||
2430 | if (reg_bits) | |
2431 | /* There exist some default graphic register. */ | |
2432 | CODING_SPEC_ISO_REQUESTED_DESIGNATION (coding, charset) | |
2433 | = (reg_bits & 1 | |
2434 | ? 0 : (reg_bits & 2 ? 1 : (reg_bits & 4 ? 2 : 3))); | |
2435 | else | |
2436 | /* We anyway have to designate CHARSET to somewhere. */ | |
2437 | CODING_SPEC_ISO_REQUESTED_DESIGNATION (coding, charset) | |
2438 | = (CHARSET_CHARS (charset) == 94 | |
2439 | ? 0 | |
2440 | : ((coding->flags & CODING_FLAG_ISO_LOCKING_SHIFT | |
2441 | || ! coding->flags & CODING_FLAG_ISO_SEVEN_BITS) | |
2442 | ? 1 | |
2443 | : (coding->flags & CODING_FLAG_ISO_SINGLE_SHIFT | |
2444 | ? 2 : 0))); | |
2445 | } | |
2446 | } | |
2447 | coding->require_flushing = 1; | |
2448 | break; | |
2449 | ||
2450 | case 3: | |
2451 | coding->type = coding_type_big5; | |
2452 | coding->flags | |
e0e989f6 | 2453 | = (NILP (XVECTOR (coding_system)->contents[4]) |
4ed46869 KH |
2454 | ? CODING_FLAG_BIG5_HKU |
2455 | : CODING_FLAG_BIG5_ETEN); | |
2456 | break; | |
2457 | ||
2458 | case 4: | |
2459 | coding->type = coding_type_ccl; | |
2460 | { | |
e0e989f6 | 2461 | Lisp_Object val = XVECTOR (coding_system)->contents[4]; |
4ed46869 KH |
2462 | if (CONSP (val) |
2463 | && VECTORP (XCONS (val)->car) | |
2464 | && VECTORP (XCONS (val)->cdr)) | |
2465 | { | |
2466 | setup_ccl_program (&(coding->spec.ccl.decoder), XCONS (val)->car); | |
2467 | setup_ccl_program (&(coding->spec.ccl.encoder), XCONS (val)->cdr); | |
2468 | } | |
2469 | else | |
2470 | goto label_invalid_coding_system; | |
2471 | } | |
2472 | coding->require_flushing = 1; | |
2473 | break; | |
2474 | ||
2475 | default: | |
2476 | if (EQ (type, Qt)) | |
0ef69138 | 2477 | coding->type = coding_type_undecided; |
4ed46869 KH |
2478 | else |
2479 | coding->type = coding_type_no_conversion; | |
2480 | break; | |
2481 | } | |
2482 | return 0; | |
2483 | ||
2484 | label_invalid_coding_system: | |
2485 | coding->type = coding_type_no_conversion; | |
dec137e5 | 2486 | coding->eol_type = CODING_EOL_LF; |
e0e989f6 KH |
2487 | coding->symbol = coding->pre_write_conversion = coding->post_read_conversion |
2488 | = Qnil; | |
4ed46869 KH |
2489 | return -1; |
2490 | } | |
2491 | ||
2492 | /* Emacs has a mechanism to automatically detect a coding system if it | |
2493 | is one of Emacs' internal format, ISO2022, SJIS, and BIG5. But, | |
2494 | it's impossible to distinguish some coding systems accurately | |
2495 | because they use the same range of codes. So, at first, coding | |
2496 | systems are categorized into 7, those are: | |
2497 | ||
0ef69138 | 2498 | o coding-category-emacs-mule |
4ed46869 KH |
2499 | |
2500 | The category for a coding system which has the same code range | |
2501 | as Emacs' internal format. Assigned the coding-system (Lisp | |
0ef69138 | 2502 | symbol) `emacs-mule' by default. |
4ed46869 KH |
2503 | |
2504 | o coding-category-sjis | |
2505 | ||
2506 | The category for a coding system which has the same code range | |
2507 | as SJIS. Assigned the coding-system (Lisp | |
7717c392 | 2508 | symbol) `japanese-shift-jis' by default. |
4ed46869 KH |
2509 | |
2510 | o coding-category-iso-7 | |
2511 | ||
2512 | The category for a coding system which has the same code range | |
7717c392 KH |
2513 | as ISO2022 of 7-bit environment. This doesn't use any locking |
2514 | shift and single shift functions. Assigned the coding-system | |
2515 | (Lisp symbol) `iso-2022-7bit' by default. | |
4ed46869 KH |
2516 | |
2517 | o coding-category-iso-8-1 | |
2518 | ||
2519 | The category for a coding system which has the same code range | |
2520 | as ISO2022 of 8-bit environment and graphic plane 1 used only | |
7717c392 KH |
2521 | for DIMENSION1 charset. This doesn't use any locking shift |
2522 | and single shift functions. Assigned the coding-system (Lisp | |
2523 | symbol) `iso-latin-1' by default. | |
4ed46869 KH |
2524 | |
2525 | o coding-category-iso-8-2 | |
2526 | ||
2527 | The category for a coding system which has the same code range | |
2528 | as ISO2022 of 8-bit environment and graphic plane 1 used only | |
7717c392 KH |
2529 | for DIMENSION2 charset. This doesn't use any locking shift |
2530 | and single shift functions. Assigned the coding-system (Lisp | |
2531 | symbol) `japanese-iso-8bit' by default. | |
4ed46869 | 2532 | |
7717c392 | 2533 | o coding-category-iso-7-else |
4ed46869 KH |
2534 | |
2535 | The category for a coding system which has the same code range | |
7717c392 KH |
2536 | as ISO2022 of 7-bit environemnt but uses locking shift or |
2537 | single shift functions. Assigned the coding-system (Lisp | |
2538 | symbol) `iso-2022-7bit-lock' by default. | |
2539 | ||
2540 | o coding-category-iso-8-else | |
2541 | ||
2542 | The category for a coding system which has the same code range | |
2543 | as ISO2022 of 8-bit environemnt but uses locking shift or | |
2544 | single shift functions. Assigned the coding-system (Lisp | |
2545 | symbol) `iso-2022-8bit-ss2' by default. | |
4ed46869 KH |
2546 | |
2547 | o coding-category-big5 | |
2548 | ||
2549 | The category for a coding system which has the same code range | |
2550 | as BIG5. Assigned the coding-system (Lisp symbol) | |
e0e989f6 | 2551 | `cn-big5' by default. |
4ed46869 KH |
2552 | |
2553 | o coding-category-binary | |
2554 | ||
2555 | The category for a coding system not categorized in any of the | |
2556 | above. Assigned the coding-system (Lisp symbol) | |
e0e989f6 | 2557 | `no-conversion' by default. |
4ed46869 KH |
2558 | |
2559 | Each of them is a Lisp symbol and the value is an actual | |
2560 | `coding-system's (this is also a Lisp symbol) assigned by a user. | |
2561 | What Emacs does actually is to detect a category of coding system. | |
2562 | Then, it uses a `coding-system' assigned to it. If Emacs can't | |
2563 | decide only one possible category, it selects a category of the | |
2564 | highest priority. Priorities of categories are also specified by a | |
2565 | user in a Lisp variable `coding-category-list'. | |
2566 | ||
2567 | */ | |
2568 | ||
2569 | /* Detect how a text of length SRC_BYTES pointed by SRC is encoded. | |
2570 | If it detects possible coding systems, return an integer in which | |
2571 | appropriate flag bits are set. Flag bits are defined by macros | |
2572 | CODING_CATEGORY_MASK_XXX in `coding.h'. */ | |
2573 | ||
2574 | int | |
2575 | detect_coding_mask (src, src_bytes) | |
2576 | unsigned char *src; | |
2577 | int src_bytes; | |
2578 | { | |
2579 | register unsigned char c; | |
2580 | unsigned char *src_end = src + src_bytes; | |
2581 | int mask; | |
2582 | ||
2583 | /* At first, skip all ASCII characters and control characters except | |
2584 | for three ISO2022 specific control characters. */ | |
bcf26d6a | 2585 | label_loop_detect_coding: |
4ed46869 KH |
2586 | while (src < src_end) |
2587 | { | |
2588 | c = *src; | |
2589 | if (c >= 0x80 | |
2590 | || (c == ISO_CODE_ESC || c == ISO_CODE_SI || c == ISO_CODE_SO)) | |
2591 | break; | |
2592 | src++; | |
2593 | } | |
2594 | ||
2595 | if (src >= src_end) | |
2596 | /* We found nothing other than ASCII. There's nothing to do. */ | |
2597 | return CODING_CATEGORY_MASK_ANY; | |
2598 | ||
2599 | /* The text seems to be encoded in some multilingual coding system. | |
2600 | Now, try to find in which coding system the text is encoded. */ | |
2601 | if (c < 0x80) | |
bcf26d6a KH |
2602 | { |
2603 | /* i.e. (c == ISO_CODE_ESC || c == ISO_CODE_SI || c == ISO_CODE_SO) */ | |
2604 | /* C is an ISO2022 specific control code of C0. */ | |
2605 | mask = detect_coding_iso2022 (src, src_end); | |
2606 | src++; | |
2607 | if (mask == CODING_CATEGORY_MASK_ANY) | |
2608 | /* No valid ISO2022 code follows C. Try again. */ | |
2609 | goto label_loop_detect_coding; | |
2610 | } | |
19a8d9e0 | 2611 | else if (c == ISO_CODE_SS2 || c == ISO_CODE_SS3) |
4ed46869 KH |
2612 | /* C is an ISO2022 specific control code of C1, |
2613 | or the first byte of SJIS's 2-byte character code, | |
2614 | or a leading code of Emacs. */ | |
2615 | mask = (detect_coding_iso2022 (src, src_end) | |
2616 | | detect_coding_sjis (src, src_end) | |
10bff6f1 RS |
2617 | | detect_coding_emacs_mule (src, src_end) |
2618 | | CODING_CATEGORY_MASK_BINARY); | |
4ed46869 | 2619 | |
19a8d9e0 KH |
2620 | else if (c == ISO_CODE_CSI |
2621 | && (src < src_end | |
2622 | && (*src == ']' | |
2623 | || (src + 1 < src_end | |
2624 | && src[1] == ']' | |
2625 | && (*src == '0' || *src == '1' || *src == '2'))))) | |
2626 | /* C is an ISO2022's control-sequence-introducer. */ | |
2627 | mask = (detect_coding_iso2022 (src, src_end) | |
2628 | | detect_coding_sjis (src, src_end) | |
10bff6f1 RS |
2629 | | detect_coding_emacs_mule (src, src_end) |
2630 | | CODING_CATEGORY_MASK_BINARY); | |
19a8d9e0 | 2631 | |
4ed46869 KH |
2632 | else if (c < 0xA0) |
2633 | /* C is the first byte of SJIS character code, | |
2634 | or a leading-code of Emacs. */ | |
2635 | mask = (detect_coding_sjis (src, src_end) | |
10bff6f1 RS |
2636 | | detect_coding_emacs_mule (src, src_end) |
2637 | | CODING_CATEGORY_MASK_BINARY); | |
4ed46869 KH |
2638 | |
2639 | else | |
2640 | /* C is a character of ISO2022 in graphic plane right, | |
2641 | or a SJIS's 1-byte character code (i.e. JISX0201), | |
2642 | or the first byte of BIG5's 2-byte code. */ | |
2643 | mask = (detect_coding_iso2022 (src, src_end) | |
2644 | | detect_coding_sjis (src, src_end) | |
10bff6f1 RS |
2645 | | detect_coding_big5 (src, src_end) |
2646 | | CODING_CATEGORY_MASK_BINARY); | |
4ed46869 KH |
2647 | |
2648 | return mask; | |
2649 | } | |
2650 | ||
2651 | /* Detect how a text of length SRC_BYTES pointed by SRC is encoded. | |
2652 | The information of the detected coding system is set in CODING. */ | |
2653 | ||
2654 | void | |
2655 | detect_coding (coding, src, src_bytes) | |
2656 | struct coding_system *coding; | |
2657 | unsigned char *src; | |
2658 | int src_bytes; | |
2659 | { | |
2660 | int mask = detect_coding_mask (src, src_bytes); | |
2661 | int idx; | |
2662 | ||
2663 | if (mask == CODING_CATEGORY_MASK_ANY) | |
2664 | /* We found nothing other than ASCII. There's nothing to do. */ | |
2665 | return; | |
2666 | ||
2667 | if (!mask) | |
2668 | /* The source text seems to be encoded in unknown coding system. | |
2669 | Emacs regards the category of such a kind of coding system as | |
2670 | `coding-category-binary'. We assume that a user has assigned | |
2671 | an appropriate coding system for a `coding-category-binary'. */ | |
2672 | idx = CODING_CATEGORY_IDX_BINARY; | |
2673 | else | |
2674 | { | |
2675 | /* We found some plausible coding systems. Let's use a coding | |
2676 | system of the highest priority. */ | |
2677 | Lisp_Object val = Vcoding_category_list; | |
2678 | ||
2679 | if (CONSP (val)) | |
2680 | while (!NILP (val)) | |
2681 | { | |
2682 | idx = XFASTINT (Fget (XCONS (val)->car, Qcoding_category_index)); | |
2683 | if ((idx < CODING_CATEGORY_IDX_MAX) && (mask & (1 << idx))) | |
2684 | break; | |
2685 | val = XCONS (val)->cdr; | |
2686 | } | |
2687 | else | |
2688 | val = Qnil; | |
2689 | ||
2690 | if (NILP (val)) | |
2691 | { | |
2692 | /* For unknown reason, `Vcoding_category_list' contains none | |
2693 | of found categories. Let's use any of them. */ | |
2694 | for (idx = 0; idx < CODING_CATEGORY_IDX_MAX; idx++) | |
2695 | if (mask & (1 << idx)) | |
2696 | break; | |
2697 | } | |
2698 | } | |
2699 | setup_coding_system (XSYMBOL (coding_category_table[idx])->value, coding); | |
2700 | } | |
2701 | ||
2702 | /* Detect how end-of-line of a text of length SRC_BYTES pointed by SRC | |
2703 | is encoded. Return one of CODING_EOL_LF, CODING_EOL_CRLF, | |
0ef69138 | 2704 | CODING_EOL_CR, and CODING_EOL_UNDECIDED. */ |
4ed46869 | 2705 | |
bc4bc72a RS |
2706 | #define MAX_EOL_CHECK_COUNT 3 |
2707 | ||
4ed46869 KH |
2708 | int |
2709 | detect_eol_type (src, src_bytes) | |
2710 | unsigned char *src; | |
2711 | int src_bytes; | |
2712 | { | |
2713 | unsigned char *src_end = src + src_bytes; | |
2714 | unsigned char c; | |
bc4bc72a RS |
2715 | int total = 0; /* How many end-of-lines are found so far. */ |
2716 | int eol_type = CODING_EOL_UNDECIDED; | |
2717 | int this_eol_type; | |
4ed46869 | 2718 | |
bc4bc72a | 2719 | while (src < src_end && total < MAX_EOL_CHECK_COUNT) |
4ed46869 KH |
2720 | { |
2721 | c = *src++; | |
bc4bc72a | 2722 | if (c == '\n' || c == '\r') |
4ed46869 | 2723 | { |
bc4bc72a RS |
2724 | total++; |
2725 | if (c == '\n') | |
2726 | this_eol_type = CODING_EOL_LF; | |
2727 | else if (src >= src_end || *src != '\n') | |
2728 | this_eol_type = CODING_EOL_CR; | |
4ed46869 | 2729 | else |
bc4bc72a RS |
2730 | this_eol_type = CODING_EOL_CRLF, src++; |
2731 | ||
2732 | if (eol_type == CODING_EOL_UNDECIDED) | |
2733 | /* This is the first end-of-line. */ | |
2734 | eol_type = this_eol_type; | |
2735 | else if (eol_type != this_eol_type) | |
2736 | /* The found type is different from what found before. | |
2737 | We had better not decode end-of-line. */ | |
2738 | return CODING_EOL_LF; | |
4ed46869 KH |
2739 | } |
2740 | } | |
bc4bc72a | 2741 | |
85a02ca4 | 2742 | return eol_type; |
4ed46869 KH |
2743 | } |
2744 | ||
2745 | /* Detect how end-of-line of a text of length SRC_BYTES pointed by SRC | |
2746 | is encoded. If it detects an appropriate format of end-of-line, it | |
2747 | sets the information in *CODING. */ | |
2748 | ||
2749 | void | |
2750 | detect_eol (coding, src, src_bytes) | |
2751 | struct coding_system *coding; | |
2752 | unsigned char *src; | |
2753 | int src_bytes; | |
2754 | { | |
2755 | Lisp_Object val; | |
2756 | int eol_type = detect_eol_type (src, src_bytes); | |
2757 | ||
0ef69138 | 2758 | if (eol_type == CODING_EOL_UNDECIDED) |
4ed46869 KH |
2759 | /* We found no end-of-line in the source text. */ |
2760 | return; | |
2761 | ||
2762 | val = Fget (coding->symbol, Qeol_type); | |
2763 | if (VECTORP (val) && XVECTOR (val)->size == 3) | |
2764 | setup_coding_system (XVECTOR (val)->contents[eol_type], coding); | |
2765 | } | |
2766 | ||
2767 | /* See "GENERAL NOTES about `decode_coding_XXX ()' functions". Before | |
2768 | decoding, it may detect coding system and format of end-of-line if | |
2769 | those are not yet decided. */ | |
2770 | ||
2771 | int | |
2772 | decode_coding (coding, source, destination, src_bytes, dst_bytes, consumed) | |
2773 | struct coding_system *coding; | |
2774 | unsigned char *source, *destination; | |
2775 | int src_bytes, dst_bytes; | |
2776 | int *consumed; | |
2777 | { | |
2778 | int produced; | |
2779 | ||
2780 | if (src_bytes <= 0) | |
2781 | { | |
2782 | *consumed = 0; | |
2783 | return 0; | |
2784 | } | |
2785 | ||
0ef69138 | 2786 | if (coding->type == coding_type_undecided) |
4ed46869 KH |
2787 | detect_coding (coding, source, src_bytes); |
2788 | ||
0ef69138 | 2789 | if (coding->eol_type == CODING_EOL_UNDECIDED) |
4ed46869 KH |
2790 | detect_eol (coding, source, src_bytes); |
2791 | ||
2792 | coding->carryover_size = 0; | |
2793 | switch (coding->type) | |
2794 | { | |
2795 | case coding_type_no_conversion: | |
2796 | label_no_conversion: | |
2797 | produced = (src_bytes > dst_bytes) ? dst_bytes : src_bytes; | |
2798 | bcopy (source, destination, produced); | |
2799 | *consumed = produced; | |
2800 | break; | |
2801 | ||
0ef69138 KH |
2802 | case coding_type_emacs_mule: |
2803 | case coding_type_undecided: | |
4ed46869 | 2804 | if (coding->eol_type == CODING_EOL_LF |
0ef69138 | 2805 | || coding->eol_type == CODING_EOL_UNDECIDED) |
4ed46869 KH |
2806 | goto label_no_conversion; |
2807 | produced = decode_eol (coding, source, destination, | |
2808 | src_bytes, dst_bytes, consumed); | |
2809 | break; | |
2810 | ||
2811 | case coding_type_sjis: | |
2812 | produced = decode_coding_sjis_big5 (coding, source, destination, | |
2813 | src_bytes, dst_bytes, consumed, | |
2814 | 1); | |
2815 | break; | |
2816 | ||
2817 | case coding_type_iso2022: | |
2818 | produced = decode_coding_iso2022 (coding, source, destination, | |
2819 | src_bytes, dst_bytes, consumed); | |
2820 | break; | |
2821 | ||
2822 | case coding_type_big5: | |
2823 | produced = decode_coding_sjis_big5 (coding, source, destination, | |
2824 | src_bytes, dst_bytes, consumed, | |
2825 | 0); | |
2826 | break; | |
2827 | ||
2828 | case coding_type_ccl: | |
2829 | produced = ccl_driver (&coding->spec.ccl.decoder, source, destination, | |
2830 | src_bytes, dst_bytes, consumed); | |
2831 | break; | |
2832 | } | |
2833 | ||
2834 | return produced; | |
2835 | } | |
2836 | ||
2837 | /* See "GENERAL NOTES about `encode_coding_XXX ()' functions". */ | |
2838 | ||
2839 | int | |
2840 | encode_coding (coding, source, destination, src_bytes, dst_bytes, consumed) | |
2841 | struct coding_system *coding; | |
2842 | unsigned char *source, *destination; | |
2843 | int src_bytes, dst_bytes; | |
2844 | int *consumed; | |
2845 | { | |
2846 | int produced; | |
2847 | ||
4ed46869 KH |
2848 | switch (coding->type) |
2849 | { | |
2850 | case coding_type_no_conversion: | |
2851 | label_no_conversion: | |
2852 | produced = (src_bytes > dst_bytes) ? dst_bytes : src_bytes; | |
2853 | if (produced > 0) | |
2854 | { | |
2855 | bcopy (source, destination, produced); | |
2856 | if (coding->selective) | |
2857 | { | |
2858 | unsigned char *p = destination, *pend = destination + produced; | |
2859 | while (p < pend) | |
e0e989f6 | 2860 | if (*p++ == '\015') p[-1] = '\n'; |
4ed46869 KH |
2861 | } |
2862 | } | |
2863 | *consumed = produced; | |
2864 | break; | |
2865 | ||
0ef69138 KH |
2866 | case coding_type_emacs_mule: |
2867 | case coding_type_undecided: | |
4ed46869 | 2868 | if (coding->eol_type == CODING_EOL_LF |
0ef69138 | 2869 | || coding->eol_type == CODING_EOL_UNDECIDED) |
4ed46869 KH |
2870 | goto label_no_conversion; |
2871 | produced = encode_eol (coding, source, destination, | |
2872 | src_bytes, dst_bytes, consumed); | |
2873 | break; | |
2874 | ||
2875 | case coding_type_sjis: | |
2876 | produced = encode_coding_sjis_big5 (coding, source, destination, | |
2877 | src_bytes, dst_bytes, consumed, | |
2878 | 1); | |
2879 | break; | |
2880 | ||
2881 | case coding_type_iso2022: | |
2882 | produced = encode_coding_iso2022 (coding, source, destination, | |
2883 | src_bytes, dst_bytes, consumed); | |
2884 | break; | |
2885 | ||
2886 | case coding_type_big5: | |
2887 | produced = encode_coding_sjis_big5 (coding, source, destination, | |
2888 | src_bytes, dst_bytes, consumed, | |
2889 | 0); | |
2890 | break; | |
2891 | ||
2892 | case coding_type_ccl: | |
2893 | produced = ccl_driver (&coding->spec.ccl.encoder, source, destination, | |
2894 | src_bytes, dst_bytes, consumed); | |
2895 | break; | |
2896 | } | |
2897 | ||
2898 | return produced; | |
2899 | } | |
2900 | ||
2901 | #define CONVERSION_BUFFER_EXTRA_ROOM 256 | |
2902 | ||
2903 | /* Return maximum size (bytes) of a buffer enough for decoding | |
2904 | SRC_BYTES of text encoded in CODING. */ | |
2905 | ||
2906 | int | |
2907 | decoding_buffer_size (coding, src_bytes) | |
2908 | struct coding_system *coding; | |
2909 | int src_bytes; | |
2910 | { | |
2911 | int magnification; | |
2912 | ||
2913 | if (coding->type == coding_type_iso2022) | |
2914 | magnification = 3; | |
2915 | else if (coding->type == coding_type_ccl) | |
2916 | magnification = coding->spec.ccl.decoder.buf_magnification; | |
2917 | else | |
2918 | magnification = 2; | |
2919 | ||
2920 | return (src_bytes * magnification + CONVERSION_BUFFER_EXTRA_ROOM); | |
2921 | } | |
2922 | ||
2923 | /* Return maximum size (bytes) of a buffer enough for encoding | |
2924 | SRC_BYTES of text to CODING. */ | |
2925 | ||
2926 | int | |
2927 | encoding_buffer_size (coding, src_bytes) | |
2928 | struct coding_system *coding; | |
2929 | int src_bytes; | |
2930 | { | |
2931 | int magnification; | |
2932 | ||
2933 | if (coding->type == coding_type_ccl) | |
2934 | magnification = coding->spec.ccl.encoder.buf_magnification; | |
2935 | else | |
2936 | magnification = 3; | |
2937 | ||
2938 | return (src_bytes * magnification + CONVERSION_BUFFER_EXTRA_ROOM); | |
2939 | } | |
2940 | ||
2941 | #ifndef MINIMUM_CONVERSION_BUFFER_SIZE | |
2942 | #define MINIMUM_CONVERSION_BUFFER_SIZE 1024 | |
2943 | #endif | |
2944 | ||
2945 | char *conversion_buffer; | |
2946 | int conversion_buffer_size; | |
2947 | ||
2948 | /* Return a pointer to a SIZE bytes of buffer to be used for encoding | |
2949 | or decoding. Sufficient memory is allocated automatically. If we | |
2950 | run out of memory, return NULL. */ | |
2951 | ||
2952 | char * | |
2953 | get_conversion_buffer (size) | |
2954 | int size; | |
2955 | { | |
2956 | if (size > conversion_buffer_size) | |
2957 | { | |
2958 | char *buf; | |
2959 | int real_size = conversion_buffer_size * 2; | |
2960 | ||
2961 | while (real_size < size) real_size *= 2; | |
2962 | buf = (char *) xmalloc (real_size); | |
2963 | xfree (conversion_buffer); | |
2964 | conversion_buffer = buf; | |
2965 | conversion_buffer_size = real_size; | |
2966 | } | |
2967 | return conversion_buffer; | |
2968 | } | |
2969 | ||
2970 | \f | |
2971 | #ifdef emacs | |
2972 | /*** 7. Emacs Lisp library functions ***/ | |
2973 | ||
02ba4723 | 2974 | DEFUN ("coding-system-spec", Fcoding_system_spec, Scoding_system_spec, |
4ed46869 | 2975 | 1, 1, 0, |
02ba4723 | 2976 | "Return coding-spec of CODING-SYSTEM.\n\ |
4ed46869 KH |
2977 | If CODING-SYSTEM is not a valid coding-system, return nil.") |
2978 | (obj) | |
2979 | Lisp_Object obj; | |
2980 | { | |
2981 | while (SYMBOLP (obj) && !NILP (obj)) | |
2982 | obj = Fget (obj, Qcoding_system); | |
2983 | return ((NILP (obj) || !VECTORP (obj) || XVECTOR (obj)->size != 5) | |
2984 | ? Qnil : obj); | |
2985 | } | |
2986 | ||
2987 | DEFUN ("coding-system-p", Fcoding_system_p, Scoding_system_p, 1, 1, 0, | |
2988 | "Return t if OBJECT is nil or a coding-system.\n\ | |
2989 | See document of make-coding-system for coding-system object.") | |
2990 | (obj) | |
2991 | Lisp_Object obj; | |
2992 | { | |
02ba4723 | 2993 | return ((NILP (obj) || !NILP (Fcoding_system_spec (obj))) ? Qt : Qnil); |
4ed46869 KH |
2994 | } |
2995 | ||
9d991de8 RS |
2996 | DEFUN ("read-non-nil-coding-system", Fread_non_nil_coding_system, |
2997 | Sread_non_nil_coding_system, 1, 1, 0, | |
e0e989f6 | 2998 | "Read a coding system from the minibuffer, prompting with string PROMPT.") |
4ed46869 KH |
2999 | (prompt) |
3000 | Lisp_Object prompt; | |
3001 | { | |
e0e989f6 | 3002 | Lisp_Object val; |
9d991de8 RS |
3003 | do |
3004 | { | |
02ba4723 | 3005 | val = Fcompleting_read (prompt, Vobarray, Qcoding_system_spec, |
9d991de8 RS |
3006 | Qt, Qnil, Qnil, Qnil); |
3007 | } | |
3008 | while (XSTRING (val)->size == 0); | |
e0e989f6 | 3009 | return (Fintern (val, Qnil)); |
4ed46869 KH |
3010 | } |
3011 | ||
3012 | DEFUN ("read-coding-system", Fread_coding_system, Sread_coding_system, 1, 1, 0, | |
e0e989f6 | 3013 | "Read a coding system or nil from the minibuffer, prompting with string PROMPT.") |
4ed46869 KH |
3014 | (prompt) |
3015 | Lisp_Object prompt; | |
3016 | { | |
e0e989f6 | 3017 | Lisp_Object val = Fcompleting_read (prompt, Vobarray, Qcoding_system_p, |
9d991de8 | 3018 | Qt, Qnil, Qnil, Qnil); |
e0e989f6 | 3019 | return (XSTRING (val)->size == 0 ? Qnil : Fintern (val, Qnil)); |
4ed46869 KH |
3020 | } |
3021 | ||
3022 | DEFUN ("check-coding-system", Fcheck_coding_system, Scheck_coding_system, | |
3023 | 1, 1, 0, | |
3024 | "Check validity of CODING-SYSTEM.\n\ | |
3025 | If valid, return CODING-SYSTEM, else `coding-system-error' is signaled.\n\ | |
3026 | CODING-SYSTEM is valid if it is a symbol and has \"coding-system\" property.\n\ | |
3027 | The value of property should be a vector of length 5.") | |
3028 | (coding_system) | |
3029 | Lisp_Object coding_system; | |
3030 | { | |
3031 | CHECK_SYMBOL (coding_system, 0); | |
3032 | if (!NILP (Fcoding_system_p (coding_system))) | |
3033 | return coding_system; | |
3034 | while (1) | |
02ba4723 | 3035 | Fsignal (Qcoding_system_error, Fcons (coding_system, Qnil)); |
4ed46869 KH |
3036 | } |
3037 | ||
3038 | DEFUN ("detect-coding-region", Fdetect_coding_region, Sdetect_coding_region, | |
3039 | 2, 2, 0, | |
bf9cdd4e KH |
3040 | "Detect coding system of the text in the region between START and END.\n\ |
3041 | Return a list of possible coding systems ordered by priority.\n\ | |
0ef69138 | 3042 | If only ASCII characters are found, it returns `undecided'\n\ |
bf9cdd4e | 3043 | or its subsidiary coding system according to a detected end-of-line format.") |
4ed46869 KH |
3044 | (b, e) |
3045 | Lisp_Object b, e; | |
3046 | { | |
3047 | int coding_mask, eol_type; | |
3048 | Lisp_Object val; | |
3049 | int beg, end; | |
3050 | ||
3051 | validate_region (&b, &e); | |
3052 | beg = XINT (b), end = XINT (e); | |
3053 | if (beg < GPT && end >= GPT) move_gap (end); | |
3054 | ||
3055 | coding_mask = detect_coding_mask (POS_ADDR (beg), end - beg); | |
3056 | eol_type = detect_eol_type (POS_ADDR (beg), end - beg); | |
3057 | ||
3058 | if (coding_mask == CODING_CATEGORY_MASK_ANY) | |
3059 | { | |
0ef69138 KH |
3060 | val = intern ("undecided"); |
3061 | if (eol_type != CODING_EOL_UNDECIDED) | |
4ed46869 KH |
3062 | { |
3063 | Lisp_Object val2 = Fget (val, Qeol_type); | |
3064 | if (VECTORP (val2)) | |
3065 | val = XVECTOR (val2)->contents[eol_type]; | |
3066 | } | |
3067 | } | |
3068 | else | |
3069 | { | |
3070 | Lisp_Object val2; | |
3071 | ||
3072 | /* At first, gather possible coding-systems in VAL in a reverse | |
3073 | order. */ | |
3074 | val = Qnil; | |
3075 | for (val2 = Vcoding_category_list; | |
3076 | !NILP (val2); | |
3077 | val2 = XCONS (val2)->cdr) | |
3078 | { | |
3079 | int idx | |
3080 | = XFASTINT (Fget (XCONS (val2)->car, Qcoding_category_index)); | |
3081 | if (coding_mask & (1 << idx)) | |
3082 | val = Fcons (Fsymbol_value (XCONS (val2)->car), val); | |
3083 | } | |
3084 | ||
3085 | /* Then, change the order of the list, while getting subsidiary | |
3086 | coding-systems. */ | |
3087 | val2 = val; | |
3088 | val = Qnil; | |
3089 | for (; !NILP (val2); val2 = XCONS (val2)->cdr) | |
3090 | { | |
0ef69138 | 3091 | if (eol_type == CODING_EOL_UNDECIDED) |
4ed46869 KH |
3092 | val = Fcons (XCONS (val2)->car, val); |
3093 | else | |
3094 | { | |
3095 | Lisp_Object val3 = Fget (XCONS (val2)->car, Qeol_type); | |
3096 | if (VECTORP (val3)) | |
3097 | val = Fcons (XVECTOR (val3)->contents[eol_type], val); | |
3098 | else | |
3099 | val = Fcons (XCONS (val2)->car, val); | |
3100 | } | |
3101 | } | |
3102 | } | |
3103 | ||
3104 | return val; | |
3105 | } | |
3106 | ||
3107 | /* Scan text in the region between *BEGP and *ENDP, skip characters | |
3108 | which we never have to encode to (iff ENCODEP is 1) or decode from | |
3109 | coding system CODING at the head and tail, then set BEGP and ENDP | |
3110 | to the addresses of start and end of the text we actually convert. */ | |
3111 | ||
3112 | void | |
3113 | shrink_conversion_area (begp, endp, coding, encodep) | |
3114 | unsigned char **begp, **endp; | |
3115 | struct coding_system *coding; | |
3116 | int encodep; | |
3117 | { | |
3118 | register unsigned char *beg_addr = *begp, *end_addr = *endp; | |
3119 | ||
3120 | if (coding->eol_type != CODING_EOL_LF | |
0ef69138 | 3121 | && coding->eol_type != CODING_EOL_UNDECIDED) |
4ed46869 KH |
3122 | /* Since we anyway have to convert end-of-line format, it is not |
3123 | worth skipping at most 100 bytes or so. */ | |
3124 | return; | |
3125 | ||
3126 | if (encodep) /* for encoding */ | |
3127 | { | |
3128 | switch (coding->type) | |
3129 | { | |
3130 | case coding_type_no_conversion: | |
0ef69138 KH |
3131 | case coding_type_emacs_mule: |
3132 | case coding_type_undecided: | |
4ed46869 KH |
3133 | /* We need no conversion. */ |
3134 | *begp = *endp; | |
3135 | return; | |
3136 | case coding_type_ccl: | |
3137 | /* We can't skip any data. */ | |
3138 | return; | |
e0e989f6 KH |
3139 | case coding_type_iso2022: |
3140 | if (coding->flags & CODING_FLAG_ISO_DESIGNATE_AT_BOL) | |
3141 | { | |
3142 | unsigned char *bol = beg_addr; | |
3143 | while (beg_addr < end_addr && *beg_addr < 0x80) | |
3144 | { | |
3145 | beg_addr++; | |
3146 | if (*(beg_addr - 1) == '\n') | |
3147 | bol = beg_addr; | |
3148 | } | |
3149 | beg_addr = bol; | |
3150 | goto label_skip_tail; | |
3151 | } | |
3152 | /* fall down ... */ | |
4ed46869 KH |
3153 | default: |
3154 | /* We can skip all ASCII characters at the head and tail. */ | |
3155 | while (beg_addr < end_addr && *beg_addr < 0x80) beg_addr++; | |
e0e989f6 | 3156 | label_skip_tail: |
4ed46869 KH |
3157 | while (beg_addr < end_addr && *(end_addr - 1) < 0x80) end_addr--; |
3158 | break; | |
3159 | } | |
3160 | } | |
3161 | else /* for decoding */ | |
3162 | { | |
3163 | switch (coding->type) | |
3164 | { | |
3165 | case coding_type_no_conversion: | |
3166 | /* We need no conversion. */ | |
3167 | *begp = *endp; | |
3168 | return; | |
0ef69138 | 3169 | case coding_type_emacs_mule: |
4ed46869 KH |
3170 | if (coding->eol_type == CODING_EOL_LF) |
3171 | { | |
3172 | /* We need no conversion. */ | |
3173 | *begp = *endp; | |
3174 | return; | |
3175 | } | |
3176 | /* We can skip all but carriage-return. */ | |
3177 | while (beg_addr < end_addr && *beg_addr != '\r') beg_addr++; | |
3178 | while (beg_addr < end_addr && *(end_addr - 1) != '\r') end_addr--; | |
3179 | break; | |
3180 | case coding_type_sjis: | |
3181 | case coding_type_big5: | |
3182 | /* We can skip all ASCII characters at the head. */ | |
3183 | while (beg_addr < end_addr && *beg_addr < 0x80) beg_addr++; | |
3184 | /* We can skip all ASCII characters at the tail except for | |
3185 | the second byte of SJIS or BIG5 code. */ | |
3186 | while (beg_addr < end_addr && *(end_addr - 1) < 0x80) end_addr--; | |
3187 | if (end_addr != *endp) | |
3188 | end_addr++; | |
3189 | break; | |
3190 | case coding_type_ccl: | |
3191 | /* We can't skip any data. */ | |
3192 | return; | |
3193 | default: /* i.e. case coding_type_iso2022: */ | |
3194 | { | |
3195 | unsigned char c; | |
3196 | ||
3197 | /* We can skip all ASCII characters except for a few | |
3198 | control codes at the head. */ | |
3199 | while (beg_addr < end_addr && (c = *beg_addr) < 0x80 | |
3200 | && c != ISO_CODE_CR && c != ISO_CODE_SO | |
3201 | && c != ISO_CODE_SI && c != ISO_CODE_ESC) | |
3202 | beg_addr++; | |
3203 | } | |
3204 | break; | |
3205 | } | |
3206 | } | |
3207 | *begp = beg_addr; | |
3208 | *endp = end_addr; | |
3209 | return; | |
3210 | } | |
3211 | ||
3212 | /* Encode to (iff ENCODEP is 1) or decode form coding system CODING a | |
3213 | text between B and E. B and E are buffer position. */ | |
3214 | ||
3215 | Lisp_Object | |
3216 | code_convert_region (b, e, coding, encodep) | |
3217 | Lisp_Object b, e; | |
3218 | struct coding_system *coding; | |
3219 | int encodep; | |
3220 | { | |
3221 | int beg, end, len, consumed, produced; | |
3222 | char *buf; | |
3223 | unsigned char *begp, *endp; | |
3224 | int pos = PT; | |
3225 | ||
3226 | validate_region (&b, &e); | |
3227 | beg = XINT (b), end = XINT (e); | |
3228 | if (beg < GPT && end >= GPT) | |
3229 | move_gap (end); | |
3230 | ||
3231 | if (encodep && !NILP (coding->pre_write_conversion)) | |
3232 | { | |
3233 | /* We must call a pre-conversion function which may put a new | |
3234 | text to be converted in a new buffer. */ | |
3235 | struct buffer *old = current_buffer, *new; | |
3236 | ||
3237 | TEMP_SET_PT (beg); | |
3238 | call2 (coding->pre_write_conversion, b, e); | |
3239 | if (old != current_buffer) | |
3240 | { | |
3241 | /* Replace the original text by the text just generated. */ | |
3242 | len = ZV - BEGV; | |
3243 | new = current_buffer; | |
3244 | set_buffer_internal (old); | |
3245 | del_range (beg, end); | |
3246 | insert_from_buffer (new, 1, len, 0); | |
3247 | end = beg + len; | |
3248 | } | |
3249 | } | |
3250 | ||
3251 | /* We may be able to shrink the conversion region. */ | |
3252 | begp = POS_ADDR (beg); endp = begp + (end - beg); | |
3253 | shrink_conversion_area (&begp, &endp, coding, encodep); | |
3254 | ||
3255 | if (begp == endp) | |
3256 | /* We need no conversion. */ | |
3257 | len = end - beg; | |
3258 | else | |
3259 | { | |
3260 | beg += begp - POS_ADDR (beg); | |
3261 | end = beg + (endp - begp); | |
3262 | ||
3263 | if (encodep) | |
3264 | len = encoding_buffer_size (coding, end - beg); | |
3265 | else | |
3266 | len = decoding_buffer_size (coding, end - beg); | |
3267 | buf = get_conversion_buffer (len); | |
3268 | ||
3269 | coding->last_block = 1; | |
3270 | produced = (encodep | |
3271 | ? encode_coding (coding, POS_ADDR (beg), buf, end - beg, len, | |
3272 | &consumed) | |
3273 | : decode_coding (coding, POS_ADDR (beg), buf, end - beg, len, | |
3274 | &consumed)); | |
3275 | ||
3276 | len = produced + (beg - XINT (b)) + (XINT (e) - end); | |
3277 | ||
3278 | TEMP_SET_PT (beg); | |
3279 | insert (buf, produced); | |
3280 | del_range (PT, PT + end - beg); | |
3281 | if (pos >= end) | |
3282 | pos = PT + (pos - end); | |
3283 | else if (pos > beg) | |
3284 | pos = beg; | |
3285 | TEMP_SET_PT (pos); | |
3286 | } | |
3287 | ||
3288 | if (!encodep && !NILP (coding->post_read_conversion)) | |
3289 | { | |
3290 | /* We must call a post-conversion function which may alter | |
3291 | the text just converted. */ | |
3292 | Lisp_Object insval; | |
3293 | ||
3294 | beg = XINT (b); | |
3295 | TEMP_SET_PT (beg); | |
3296 | insval = call1 (coding->post_read_conversion, make_number (len)); | |
3297 | CHECK_NUMBER (insval, 0); | |
3298 | len = XINT (insval); | |
3299 | } | |
3300 | ||
3301 | return make_number (len); | |
3302 | } | |
3303 | ||
3304 | Lisp_Object | |
e0e989f6 KH |
3305 | code_convert_string (str, coding, encodep, nocopy) |
3306 | Lisp_Object str, nocopy; | |
4ed46869 KH |
3307 | struct coding_system *coding; |
3308 | int encodep; | |
3309 | { | |
3310 | int len, consumed, produced; | |
3311 | char *buf; | |
3312 | unsigned char *begp, *endp; | |
3313 | int head_skip, tail_skip; | |
3314 | struct gcpro gcpro1; | |
3315 | ||
3316 | if (encodep && !NILP (coding->pre_write_conversion) | |
3317 | || !encodep && !NILP (coding->post_read_conversion)) | |
3318 | { | |
3319 | /* Since we have to call Lisp functions which assume target text | |
3320 | is in a buffer, after setting a temporary buffer, call | |
3321 | code_convert_region. */ | |
3322 | int count = specpdl_ptr - specpdl; | |
3323 | int len = XSTRING (str)->size; | |
3324 | Lisp_Object result; | |
3325 | struct buffer *old = current_buffer; | |
3326 | ||
3327 | record_unwind_protect (Fset_buffer, Fcurrent_buffer ()); | |
3328 | temp_output_buffer_setup (" *code-converting-work*"); | |
3329 | set_buffer_internal (XBUFFER (Vstandard_output)); | |
3330 | insert_from_string (str, 0, len, 0); | |
3331 | code_convert_region (make_number (BEGV), make_number (ZV), | |
3332 | coding, encodep); | |
3333 | result = make_buffer_string (BEGV, ZV, 0); | |
3334 | set_buffer_internal (old); | |
3335 | return unbind_to (count, result); | |
3336 | } | |
3337 | ||
3338 | /* We may be able to shrink the conversion region. */ | |
3339 | begp = XSTRING (str)->data; | |
3340 | endp = begp + XSTRING (str)->size; | |
3341 | shrink_conversion_area (&begp, &endp, coding, encodep); | |
3342 | ||
3343 | if (begp == endp) | |
3344 | /* We need no conversion. */ | |
e0e989f6 | 3345 | return (NILP (nocopy) ? Fcopy_sequence (str) : str); |
4ed46869 KH |
3346 | |
3347 | head_skip = begp - XSTRING (str)->data; | |
3348 | tail_skip = XSTRING (str)->size - head_skip - (endp - begp); | |
3349 | ||
3350 | GCPRO1 (str); | |
3351 | ||
3352 | if (encodep) | |
3353 | len = encoding_buffer_size (coding, endp - begp); | |
3354 | else | |
3355 | len = decoding_buffer_size (coding, endp - begp); | |
3356 | buf = get_conversion_buffer (len + head_skip + tail_skip); | |
3357 | ||
3358 | bcopy (XSTRING (str)->data, buf, head_skip); | |
3359 | coding->last_block = 1; | |
3360 | produced = (encodep | |
3361 | ? encode_coding (coding, XSTRING (str)->data + head_skip, | |
3362 | buf + head_skip, endp - begp, len, &consumed) | |
3363 | : decode_coding (coding, XSTRING (str)->data + head_skip, | |
3364 | buf + head_skip, endp - begp, len, &consumed)); | |
3365 | bcopy (XSTRING (str)->data + head_skip + (endp - begp), | |
3366 | buf + head_skip + produced, | |
3367 | tail_skip); | |
3368 | ||
3369 | UNGCPRO; | |
3370 | ||
3371 | return make_string (buf, head_skip + produced + tail_skip); | |
3372 | } | |
3373 | ||
3374 | DEFUN ("decode-coding-region", Fdecode_coding_region, Sdecode_coding_region, | |
e0e989f6 KH |
3375 | 3, 3, "r\nzCoding system: ", |
3376 | "Decode current region by specified coding system.\n\ | |
3377 | When called from a program, takes three arguments:\n\ | |
3378 | START, END, and CODING-SYSTEM. START END are buffer positions.\n\ | |
4ed46869 KH |
3379 | Return length of decoded text.") |
3380 | (b, e, coding_system) | |
3381 | Lisp_Object b, e, coding_system; | |
3382 | { | |
3383 | struct coding_system coding; | |
3384 | ||
3385 | CHECK_NUMBER_COERCE_MARKER (b, 0); | |
3386 | CHECK_NUMBER_COERCE_MARKER (e, 1); | |
3387 | CHECK_SYMBOL (coding_system, 2); | |
3388 | ||
e0e989f6 KH |
3389 | if (NILP (coding_system)) |
3390 | return make_number (XFASTINT (e) - XFASTINT (b)); | |
4ed46869 KH |
3391 | if (setup_coding_system (Fcheck_coding_system (coding_system), &coding) < 0) |
3392 | error ("Invalid coding-system: %s", XSYMBOL (coding_system)->name->data); | |
3393 | ||
3394 | return code_convert_region (b, e, &coding, 0); | |
3395 | } | |
3396 | ||
3397 | DEFUN ("encode-coding-region", Fencode_coding_region, Sencode_coding_region, | |
e0e989f6 KH |
3398 | 3, 3, "r\nzCoding system: ", |
3399 | "Encode current region by specified coding system.\n\ | |
3400 | When called from a program, takes three arguments:\n\ | |
3401 | START, END, and CODING-SYSTEM. START END are buffer positions.\n\ | |
4ed46869 KH |
3402 | Return length of encoded text.") |
3403 | (b, e, coding_system) | |
3404 | Lisp_Object b, e, coding_system; | |
3405 | { | |
3406 | struct coding_system coding; | |
3407 | ||
3408 | CHECK_NUMBER_COERCE_MARKER (b, 0); | |
3409 | CHECK_NUMBER_COERCE_MARKER (e, 1); | |
3410 | CHECK_SYMBOL (coding_system, 2); | |
3411 | ||
e0e989f6 KH |
3412 | if (NILP (coding_system)) |
3413 | return make_number (XFASTINT (e) - XFASTINT (b)); | |
4ed46869 KH |
3414 | if (setup_coding_system (Fcheck_coding_system (coding_system), &coding) < 0) |
3415 | error ("Invalid coding-system: %s", XSYMBOL (coding_system)->name->data); | |
3416 | ||
3417 | return code_convert_region (b, e, &coding, 1); | |
3418 | } | |
3419 | ||
3420 | DEFUN ("decode-coding-string", Fdecode_coding_string, Sdecode_coding_string, | |
e0e989f6 KH |
3421 | 2, 3, 0, |
3422 | "Decode STRING which is encoded in CODING-SYSTEM, and return the result.\n\ | |
3423 | Optional arg NOCOPY non-nil means return STRING itself if there's no need\n\ | |
3424 | of decoding.") | |
3425 | (string, coding_system, nocopy) | |
3426 | Lisp_Object string, coding_system, nocopy; | |
4ed46869 KH |
3427 | { |
3428 | struct coding_system coding; | |
3429 | ||
3430 | CHECK_STRING (string, 0); | |
3431 | CHECK_SYMBOL (coding_system, 1); | |
3432 | ||
e0e989f6 KH |
3433 | if (NILP (coding_system)) |
3434 | return (NILP (nocopy) ? Fcopy_sequence (string) : string); | |
4ed46869 KH |
3435 | if (setup_coding_system (Fcheck_coding_system (coding_system), &coding) < 0) |
3436 | error ("Invalid coding-system: %s", XSYMBOL (coding_system)->name->data); | |
3437 | ||
e0e989f6 | 3438 | return code_convert_string (string, &coding, 0, nocopy); |
4ed46869 KH |
3439 | } |
3440 | ||
3441 | DEFUN ("encode-coding-string", Fencode_coding_string, Sencode_coding_string, | |
e0e989f6 KH |
3442 | 2, 3, 0, |
3443 | "Encode STRING to CODING-SYSTEM, and return the result.\n\ | |
3444 | Optional arg NOCOPY non-nil means return STRING itself if there's no need\n\ | |
3445 | of encoding.") | |
3446 | (string, coding_system, nocopy) | |
3447 | Lisp_Object string, coding_system, nocopy; | |
4ed46869 KH |
3448 | { |
3449 | struct coding_system coding; | |
3450 | ||
3451 | CHECK_STRING (string, 0); | |
3452 | CHECK_SYMBOL (coding_system, 1); | |
3453 | ||
e0e989f6 KH |
3454 | if (NILP (coding_system)) |
3455 | return (NILP (nocopy) ? Fcopy_sequence (string) : string); | |
4ed46869 KH |
3456 | if (setup_coding_system (Fcheck_coding_system (coding_system), &coding) < 0) |
3457 | error ("Invalid coding-system: %s", XSYMBOL (coding_system)->name->data); | |
3458 | ||
e0e989f6 | 3459 | return code_convert_string (string, &coding, 1, nocopy); |
4ed46869 KH |
3460 | } |
3461 | ||
3462 | DEFUN ("decode-sjis-char", Fdecode_sjis_char, Sdecode_sjis_char, 1, 1, 0, | |
e0e989f6 | 3463 | "Decode a JISX0208 character of shift-jis encoding.\n\ |
4ed46869 KH |
3464 | CODE is the character code in SJIS.\n\ |
3465 | Return the corresponding character.") | |
3466 | (code) | |
3467 | Lisp_Object code; | |
3468 | { | |
3469 | unsigned char c1, c2, s1, s2; | |
3470 | Lisp_Object val; | |
3471 | ||
3472 | CHECK_NUMBER (code, 0); | |
3473 | s1 = (XFASTINT (code)) >> 8, s2 = (XFASTINT (code)) & 0xFF; | |
3474 | DECODE_SJIS (s1, s2, c1, c2); | |
3475 | XSETFASTINT (val, MAKE_NON_ASCII_CHAR (charset_jisx0208, c1, c2)); | |
3476 | return val; | |
3477 | } | |
3478 | ||
3479 | DEFUN ("encode-sjis-char", Fencode_sjis_char, Sencode_sjis_char, 1, 1, 0, | |
3480 | "Encode a JISX0208 character CHAR to SJIS coding-system.\n\ | |
3481 | Return the corresponding character code in SJIS.") | |
3482 | (ch) | |
3483 | Lisp_Object ch; | |
3484 | { | |
bcf26d6a | 3485 | int charset, c1, c2, s1, s2; |
4ed46869 KH |
3486 | Lisp_Object val; |
3487 | ||
3488 | CHECK_NUMBER (ch, 0); | |
3489 | SPLIT_CHAR (XFASTINT (ch), charset, c1, c2); | |
3490 | if (charset == charset_jisx0208) | |
3491 | { | |
3492 | ENCODE_SJIS (c1, c2, s1, s2); | |
bcf26d6a | 3493 | XSETFASTINT (val, (s1 << 8) | s2); |
4ed46869 KH |
3494 | } |
3495 | else | |
3496 | XSETFASTINT (val, 0); | |
3497 | return val; | |
3498 | } | |
3499 | ||
3500 | DEFUN ("decode-big5-char", Fdecode_big5_char, Sdecode_big5_char, 1, 1, 0, | |
3501 | "Decode a Big5 character CODE of BIG5 coding-system.\n\ | |
3502 | CODE is the character code in BIG5.\n\ | |
3503 | Return the corresponding character.") | |
3504 | (code) | |
3505 | Lisp_Object code; | |
3506 | { | |
3507 | int charset; | |
3508 | unsigned char b1, b2, c1, c2; | |
3509 | Lisp_Object val; | |
3510 | ||
3511 | CHECK_NUMBER (code, 0); | |
3512 | b1 = (XFASTINT (code)) >> 8, b2 = (XFASTINT (code)) & 0xFF; | |
3513 | DECODE_BIG5 (b1, b2, charset, c1, c2); | |
3514 | XSETFASTINT (val, MAKE_NON_ASCII_CHAR (charset, c1, c2)); | |
3515 | return val; | |
3516 | } | |
3517 | ||
3518 | DEFUN ("encode-big5-char", Fencode_big5_char, Sencode_big5_char, 1, 1, 0, | |
3519 | "Encode the Big5 character CHAR to BIG5 coding-system.\n\ | |
3520 | Return the corresponding character code in Big5.") | |
3521 | (ch) | |
3522 | Lisp_Object ch; | |
3523 | { | |
bcf26d6a | 3524 | int charset, c1, c2, b1, b2; |
4ed46869 KH |
3525 | Lisp_Object val; |
3526 | ||
3527 | CHECK_NUMBER (ch, 0); | |
3528 | SPLIT_CHAR (XFASTINT (ch), charset, c1, c2); | |
3529 | if (charset == charset_big5_1 || charset == charset_big5_2) | |
3530 | { | |
3531 | ENCODE_BIG5 (charset, c1, c2, b1, b2); | |
bcf26d6a | 3532 | XSETFASTINT (val, (b1 << 8) | b2); |
4ed46869 KH |
3533 | } |
3534 | else | |
3535 | XSETFASTINT (val, 0); | |
3536 | return val; | |
3537 | } | |
3538 | ||
1ba9e4ab KH |
3539 | DEFUN ("set-terminal-coding-system-internal", |
3540 | Fset_terminal_coding_system_internal, | |
3541 | Sset_terminal_coding_system_internal, 1, 1, 0, "") | |
4ed46869 KH |
3542 | (coding_system) |
3543 | Lisp_Object coding_system; | |
3544 | { | |
3545 | CHECK_SYMBOL (coding_system, 0); | |
3546 | setup_coding_system (Fcheck_coding_system (coding_system), &terminal_coding); | |
4ed46869 KH |
3547 | return Qnil; |
3548 | } | |
3549 | ||
3550 | DEFUN ("terminal-coding-system", | |
3551 | Fterminal_coding_system, Sterminal_coding_system, 0, 0, 0, | |
3552 | "Return coding-system of your terminal.") | |
3553 | () | |
3554 | { | |
3555 | return terminal_coding.symbol; | |
3556 | } | |
3557 | ||
1ba9e4ab KH |
3558 | DEFUN ("set-keyboard-coding-system-internal", |
3559 | Fset_keyboard_coding_system_internal, | |
3560 | Sset_keyboard_coding_system_internal, 1, 1, 0, "") | |
4ed46869 KH |
3561 | (coding_system) |
3562 | Lisp_Object coding_system; | |
3563 | { | |
3564 | CHECK_SYMBOL (coding_system, 0); | |
3565 | setup_coding_system (Fcheck_coding_system (coding_system), &keyboard_coding); | |
3566 | return Qnil; | |
3567 | } | |
3568 | ||
3569 | DEFUN ("keyboard-coding-system", | |
3570 | Fkeyboard_coding_system, Skeyboard_coding_system, 0, 0, 0, | |
3571 | "Return coding-system of what is sent from terminal keyboard.") | |
3572 | () | |
3573 | { | |
3574 | return keyboard_coding.symbol; | |
3575 | } | |
3576 | ||
3577 | \f | |
a5d301df KH |
3578 | DEFUN ("find-operation-coding-system", Ffind_operation_coding_system, |
3579 | Sfind_operation_coding_system, 1, MANY, 0, | |
3580 | "Choose a coding system for an operation based on the target name.\n\ | |
9ce27fde KH |
3581 | The value names a pair of coding systems: (DECODING-SYSTEM ENCODING-SYSTEM).\n\ |
3582 | DECODING-SYSTEM is the coding system to use for decoding\n\ | |
3583 | \(in case OPERATION does decoding), and ENCODING-SYSTEM is the coding system\n\ | |
3584 | for encoding (in case OPERATION does encoding).\n\ | |
ccdb79f5 RS |
3585 | \n\ |
3586 | The first argument OPERATION specifies an I/O primitive:\n\ | |
3587 | For file I/O, `insert-file-contents' or `write-region'.\n\ | |
3588 | For process I/O, `call-process', `call-process-region', or `start-process'.\n\ | |
3589 | For network I/O, `open-network-stream'.\n\ | |
3590 | \n\ | |
3591 | The remaining arguments should be the same arguments that were passed\n\ | |
3592 | to the primitive. Depending on which primitive, one of those arguments\n\ | |
3593 | is selected as the TARGET. For example, if OPERATION does file I/O,\n\ | |
3594 | whichever argument specifies the file name is TARGET.\n\ | |
3595 | \n\ | |
3596 | TARGET has a meaning which depends on OPERATION:\n\ | |
4ed46869 KH |
3597 | For file I/O, TARGET is a file name.\n\ |
3598 | For process I/O, TARGET is a process name.\n\ | |
3599 | For network I/O, TARGET is a service name or a port number\n\ | |
3600 | \n\ | |
02ba4723 KH |
3601 | This function looks up what specified for TARGET in,\n\ |
3602 | `file-coding-system-alist', `process-coding-system-alist',\n\ | |
3603 | or `network-coding-system-alist' depending on OPERATION.\n\ | |
3604 | They may specify a coding system, a cons of coding systems,\n\ | |
3605 | or a function symbol to call.\n\ | |
3606 | In the last case, we call the function with one argument,\n\ | |
9ce27fde | 3607 | which is a list of all the arguments given to this function.") |
4ed46869 KH |
3608 | (nargs, args) |
3609 | int nargs; | |
3610 | Lisp_Object *args; | |
3611 | { | |
3612 | Lisp_Object operation, target_idx, target, val; | |
3613 | register Lisp_Object chain; | |
3614 | ||
3615 | if (nargs < 2) | |
3616 | error ("Too few arguments"); | |
3617 | operation = args[0]; | |
3618 | if (!SYMBOLP (operation) | |
3619 | || !INTEGERP (target_idx = Fget (operation, Qtarget_idx))) | |
3620 | error ("Invalid first arguement"); | |
3621 | if (nargs < 1 + XINT (target_idx)) | |
3622 | error ("Too few arguments for operation: %s", | |
3623 | XSYMBOL (operation)->name->data); | |
3624 | target = args[XINT (target_idx) + 1]; | |
3625 | if (!(STRINGP (target) | |
3626 | || (EQ (operation, Qopen_network_stream) && INTEGERP (target)))) | |
3627 | error ("Invalid %dth argument", XINT (target_idx) + 1); | |
3628 | ||
2e34157c RS |
3629 | chain = ((EQ (operation, Qinsert_file_contents) |
3630 | || EQ (operation, Qwrite_region)) | |
02ba4723 | 3631 | ? Vfile_coding_system_alist |
2e34157c | 3632 | : (EQ (operation, Qopen_network_stream) |
02ba4723 KH |
3633 | ? Vnetwork_coding_system_alist |
3634 | : Vprocess_coding_system_alist)); | |
4ed46869 KH |
3635 | if (NILP (chain)) |
3636 | return Qnil; | |
3637 | ||
02ba4723 | 3638 | for (; CONSP (chain); chain = XCONS (chain)->cdr) |
4ed46869 KH |
3639 | { |
3640 | Lisp_Object elt = XCONS (chain)->car; | |
3641 | ||
3642 | if (CONSP (elt) | |
3643 | && ((STRINGP (target) | |
3644 | && STRINGP (XCONS (elt)->car) | |
3645 | && fast_string_match (XCONS (elt)->car, target) >= 0) | |
3646 | || (INTEGERP (target) && EQ (target, XCONS (elt)->car)))) | |
02ba4723 KH |
3647 | { |
3648 | val = XCONS (elt)->cdr; | |
3649 | if (CONSP (val)) | |
3650 | return val; | |
3651 | if (! SYMBOLP (val)) | |
3652 | return Qnil; | |
3653 | if (! NILP (Fcoding_system_p (val))) | |
3654 | return Fcons (val, val); | |
465edc86 | 3655 | if (!NILP (Ffboundp (val))) |
5d632ccf | 3656 | return call1 (val, Flist (nargs, args)); |
02ba4723 KH |
3657 | return Qnil; |
3658 | } | |
4ed46869 KH |
3659 | } |
3660 | return Qnil; | |
3661 | } | |
3662 | ||
3663 | #endif /* emacs */ | |
3664 | ||
3665 | \f | |
3666 | /*** 8. Post-amble ***/ | |
3667 | ||
3668 | init_coding_once () | |
3669 | { | |
3670 | int i; | |
3671 | ||
0ef69138 | 3672 | /* Emacs' internal format specific initialize routine. */ |
4ed46869 KH |
3673 | for (i = 0; i <= 0x20; i++) |
3674 | emacs_code_class[i] = EMACS_control_code; | |
3675 | emacs_code_class[0x0A] = EMACS_linefeed_code; | |
3676 | emacs_code_class[0x0D] = EMACS_carriage_return_code; | |
3677 | for (i = 0x21 ; i < 0x7F; i++) | |
3678 | emacs_code_class[i] = EMACS_ascii_code; | |
3679 | emacs_code_class[0x7F] = EMACS_control_code; | |
3680 | emacs_code_class[0x80] = EMACS_leading_code_composition; | |
3681 | for (i = 0x81; i < 0xFF; i++) | |
3682 | emacs_code_class[i] = EMACS_invalid_code; | |
3683 | emacs_code_class[LEADING_CODE_PRIVATE_11] = EMACS_leading_code_3; | |
3684 | emacs_code_class[LEADING_CODE_PRIVATE_12] = EMACS_leading_code_3; | |
3685 | emacs_code_class[LEADING_CODE_PRIVATE_21] = EMACS_leading_code_4; | |
3686 | emacs_code_class[LEADING_CODE_PRIVATE_22] = EMACS_leading_code_4; | |
3687 | ||
3688 | /* ISO2022 specific initialize routine. */ | |
3689 | for (i = 0; i < 0x20; i++) | |
3690 | iso_code_class[i] = ISO_control_code; | |
3691 | for (i = 0x21; i < 0x7F; i++) | |
3692 | iso_code_class[i] = ISO_graphic_plane_0; | |
3693 | for (i = 0x80; i < 0xA0; i++) | |
3694 | iso_code_class[i] = ISO_control_code; | |
3695 | for (i = 0xA1; i < 0xFF; i++) | |
3696 | iso_code_class[i] = ISO_graphic_plane_1; | |
3697 | iso_code_class[0x20] = iso_code_class[0x7F] = ISO_0x20_or_0x7F; | |
3698 | iso_code_class[0xA0] = iso_code_class[0xFF] = ISO_0xA0_or_0xFF; | |
3699 | iso_code_class[ISO_CODE_CR] = ISO_carriage_return; | |
3700 | iso_code_class[ISO_CODE_SO] = ISO_shift_out; | |
3701 | iso_code_class[ISO_CODE_SI] = ISO_shift_in; | |
3702 | iso_code_class[ISO_CODE_SS2_7] = ISO_single_shift_2_7; | |
3703 | iso_code_class[ISO_CODE_ESC] = ISO_escape; | |
3704 | iso_code_class[ISO_CODE_SS2] = ISO_single_shift_2; | |
3705 | iso_code_class[ISO_CODE_SS3] = ISO_single_shift_3; | |
3706 | iso_code_class[ISO_CODE_CSI] = ISO_control_sequence_introducer; | |
3707 | ||
e0e989f6 KH |
3708 | conversion_buffer_size = MINIMUM_CONVERSION_BUFFER_SIZE; |
3709 | conversion_buffer = (char *) xmalloc (MINIMUM_CONVERSION_BUFFER_SIZE); | |
3710 | ||
3711 | setup_coding_system (Qnil, &keyboard_coding); | |
3712 | setup_coding_system (Qnil, &terminal_coding); | |
9ce27fde KH |
3713 | |
3714 | #if defined (MSDOS) || defined (WINDOWSNT) | |
3715 | system_eol_type = CODING_EOL_CRLF; | |
3716 | #else | |
3717 | system_eol_type = CODING_EOL_LF; | |
3718 | #endif | |
e0e989f6 KH |
3719 | } |
3720 | ||
3721 | #ifdef emacs | |
3722 | ||
3723 | syms_of_coding () | |
3724 | { | |
3725 | Qtarget_idx = intern ("target-idx"); | |
3726 | staticpro (&Qtarget_idx); | |
3727 | ||
9ce27fde | 3728 | /* Target FILENAME is the first argument. */ |
e0e989f6 | 3729 | Fput (Qinsert_file_contents, Qtarget_idx, make_number (0)); |
9ce27fde | 3730 | /* Target FILENAME is the third argument. */ |
e0e989f6 KH |
3731 | Fput (Qwrite_region, Qtarget_idx, make_number (2)); |
3732 | ||
3733 | Qcall_process = intern ("call-process"); | |
3734 | staticpro (&Qcall_process); | |
9ce27fde | 3735 | /* Target PROGRAM is the first argument. */ |
e0e989f6 KH |
3736 | Fput (Qcall_process, Qtarget_idx, make_number (0)); |
3737 | ||
3738 | Qcall_process_region = intern ("call-process-region"); | |
3739 | staticpro (&Qcall_process_region); | |
9ce27fde | 3740 | /* Target PROGRAM is the third argument. */ |
e0e989f6 KH |
3741 | Fput (Qcall_process_region, Qtarget_idx, make_number (2)); |
3742 | ||
3743 | Qstart_process = intern ("start-process"); | |
3744 | staticpro (&Qstart_process); | |
9ce27fde | 3745 | /* Target PROGRAM is the third argument. */ |
e0e989f6 KH |
3746 | Fput (Qstart_process, Qtarget_idx, make_number (2)); |
3747 | ||
3748 | Qopen_network_stream = intern ("open-network-stream"); | |
3749 | staticpro (&Qopen_network_stream); | |
9ce27fde | 3750 | /* Target SERVICE is the fourth argument. */ |
e0e989f6 KH |
3751 | Fput (Qopen_network_stream, Qtarget_idx, make_number (3)); |
3752 | ||
4ed46869 KH |
3753 | Qcoding_system = intern ("coding-system"); |
3754 | staticpro (&Qcoding_system); | |
3755 | ||
3756 | Qeol_type = intern ("eol-type"); | |
3757 | staticpro (&Qeol_type); | |
3758 | ||
3759 | Qbuffer_file_coding_system = intern ("buffer-file-coding-system"); | |
3760 | staticpro (&Qbuffer_file_coding_system); | |
3761 | ||
3762 | Qpost_read_conversion = intern ("post-read-conversion"); | |
3763 | staticpro (&Qpost_read_conversion); | |
3764 | ||
3765 | Qpre_write_conversion = intern ("pre-write-conversion"); | |
3766 | staticpro (&Qpre_write_conversion); | |
3767 | ||
02ba4723 KH |
3768 | Qcoding_system_spec = intern ("coding-system-spec"); |
3769 | staticpro (&Qcoding_system_spec); | |
4ed46869 KH |
3770 | |
3771 | Qcoding_system_p = intern ("coding-system-p"); | |
3772 | staticpro (&Qcoding_system_p); | |
3773 | ||
3774 | Qcoding_system_error = intern ("coding-system-error"); | |
3775 | staticpro (&Qcoding_system_error); | |
3776 | ||
3777 | Fput (Qcoding_system_error, Qerror_conditions, | |
3778 | Fcons (Qcoding_system_error, Fcons (Qerror, Qnil))); | |
3779 | Fput (Qcoding_system_error, Qerror_message, | |
9ce27fde | 3780 | build_string ("Invalid coding system")); |
4ed46869 KH |
3781 | |
3782 | Qcoding_category_index = intern ("coding-category-index"); | |
3783 | staticpro (&Qcoding_category_index); | |
3784 | ||
3785 | { | |
3786 | int i; | |
3787 | for (i = 0; i < CODING_CATEGORY_IDX_MAX; i++) | |
3788 | { | |
3789 | coding_category_table[i] = intern (coding_category_name[i]); | |
3790 | staticpro (&coding_category_table[i]); | |
3791 | Fput (coding_category_table[i], Qcoding_category_index, | |
3792 | make_number (i)); | |
3793 | } | |
3794 | } | |
3795 | ||
bdd9fb48 KH |
3796 | Qcharacter_unification_table = intern ("character-unification-table"); |
3797 | staticpro (&Qcharacter_unification_table); | |
3798 | Fput (Qcharacter_unification_table, Qchar_table_extra_slots, | |
3799 | make_number (0)); | |
3800 | ||
a5d301df KH |
3801 | Qcharacter_unification_table_for_decode |
3802 | = intern ("character-unification-table-for-decode"); | |
3803 | staticpro (&Qcharacter_unification_table_for_decode); | |
3804 | ||
3805 | Qcharacter_unification_table_for_encode | |
3806 | = intern ("character-unification-table-for-encode"); | |
3807 | staticpro (&Qcharacter_unification_table_for_encode); | |
3808 | ||
9ce27fde KH |
3809 | Qemacs_mule = intern ("emacs-mule"); |
3810 | staticpro (&Qemacs_mule); | |
3811 | ||
02ba4723 | 3812 | defsubr (&Scoding_system_spec); |
4ed46869 KH |
3813 | defsubr (&Scoding_system_p); |
3814 | defsubr (&Sread_coding_system); | |
3815 | defsubr (&Sread_non_nil_coding_system); | |
3816 | defsubr (&Scheck_coding_system); | |
3817 | defsubr (&Sdetect_coding_region); | |
3818 | defsubr (&Sdecode_coding_region); | |
3819 | defsubr (&Sencode_coding_region); | |
3820 | defsubr (&Sdecode_coding_string); | |
3821 | defsubr (&Sencode_coding_string); | |
3822 | defsubr (&Sdecode_sjis_char); | |
3823 | defsubr (&Sencode_sjis_char); | |
3824 | defsubr (&Sdecode_big5_char); | |
3825 | defsubr (&Sencode_big5_char); | |
1ba9e4ab | 3826 | defsubr (&Sset_terminal_coding_system_internal); |
4ed46869 | 3827 | defsubr (&Sterminal_coding_system); |
1ba9e4ab | 3828 | defsubr (&Sset_keyboard_coding_system_internal); |
4ed46869 | 3829 | defsubr (&Skeyboard_coding_system); |
a5d301df | 3830 | defsubr (&Sfind_operation_coding_system); |
4ed46869 KH |
3831 | |
3832 | DEFVAR_LISP ("coding-category-list", &Vcoding_category_list, | |
3833 | "List of coding-categories (symbols) ordered by priority."); | |
3834 | { | |
3835 | int i; | |
3836 | ||
3837 | Vcoding_category_list = Qnil; | |
3838 | for (i = CODING_CATEGORY_IDX_MAX - 1; i >= 0; i--) | |
3839 | Vcoding_category_list | |
3840 | = Fcons (coding_category_table[i], Vcoding_category_list); | |
3841 | } | |
3842 | ||
3843 | DEFVAR_LISP ("coding-system-for-read", &Vcoding_system_for_read, | |
10bff6f1 RS |
3844 | "Specify the coding system for read operations.\n\ |
3845 | It is useful to bind this variable with `let', but do not set it globally. | |
4ed46869 | 3846 | If the value is a coding system, it is used for decoding on read operation.\n\ |
a67a9c66 | 3847 | If not, an appropriate element is used from one of the coding system alists:\n\ |
10bff6f1 | 3848 | There are three such tables, `file-coding-system-alist',\n\ |
a67a9c66 | 3849 | `process-coding-system-alist', and `network-coding-system-alist'."); |
4ed46869 KH |
3850 | Vcoding_system_for_read = Qnil; |
3851 | ||
3852 | DEFVAR_LISP ("coding-system-for-write", &Vcoding_system_for_write, | |
10bff6f1 RS |
3853 | "Specify the coding system for write operations.\n\ |
3854 | It is useful to bind this variable with `let', but do not set it globally. | |
4ed46869 | 3855 | If the value is a coding system, it is used for encoding on write operation.\n\ |
a67a9c66 | 3856 | If not, an appropriate element is used from one of the coding system alists:\n\ |
10bff6f1 | 3857 | There are three such tables, `file-coding-system-alist',\n\ |
a67a9c66 | 3858 | `process-coding-system-alist', and `network-coding-system-alist'."); |
4ed46869 KH |
3859 | Vcoding_system_for_write = Qnil; |
3860 | ||
3861 | DEFVAR_LISP ("last-coding-system-used", &Vlast_coding_system_used, | |
a67a9c66 | 3862 | "Coding system used in the latest file or process I/O."); |
4ed46869 KH |
3863 | Vlast_coding_system_used = Qnil; |
3864 | ||
9ce27fde KH |
3865 | DEFVAR_BOOL ("inhibit-eol-conversion", &inhibit_eol_conversion, |
3866 | "*Non-nil inhibit code conversion of end-of-line format in any cases."); | |
3867 | inhibit_eol_conversion = 0; | |
3868 | ||
02ba4723 KH |
3869 | DEFVAR_LISP ("file-coding-system-alist", &Vfile_coding_system_alist, |
3870 | "Alist to decide a coding system to use for a file I/O operation.\n\ | |
3871 | The format is ((PATTERN . VAL) ...),\n\ | |
3872 | where PATTERN is a regular expression matching a file name,\n\ | |
3873 | VAL is a coding system, a cons of coding systems, or a function symbol.\n\ | |
3874 | If VAL is a coding system, it is used for both decoding and encoding\n\ | |
3875 | the file contents.\n\ | |
3876 | If VAL is a cons of coding systems, the car part is used for decoding,\n\ | |
3877 | and the cdr part is used for encoding.\n\ | |
3878 | If VAL is a function symbol, the function must return a coding system\n\ | |
3879 | or a cons of coding systems which are used as above.\n\ | |
e0e989f6 | 3880 | \n\ |
9ce27fde | 3881 | See also the function `find-operation-coding-system'."); |
02ba4723 KH |
3882 | Vfile_coding_system_alist = Qnil; |
3883 | ||
3884 | DEFVAR_LISP ("process-coding-system-alist", &Vprocess_coding_system_alist, | |
3885 | "Alist to decide a coding system to use for a process I/O operation.\n\ | |
3886 | The format is ((PATTERN . VAL) ...),\n\ | |
3887 | where PATTERN is a regular expression matching a program name,\n\ | |
3888 | VAL is a coding system, a cons of coding systems, or a function symbol.\n\ | |
3889 | If VAL is a coding system, it is used for both decoding what received\n\ | |
3890 | from the program and encoding what sent to the program.\n\ | |
3891 | If VAL is a cons of coding systems, the car part is used for decoding,\n\ | |
3892 | and the cdr part is used for encoding.\n\ | |
3893 | If VAL is a function symbol, the function must return a coding system\n\ | |
3894 | or a cons of coding systems which are used as above.\n\ | |
4ed46869 | 3895 | \n\ |
9ce27fde | 3896 | See also the function `find-operation-coding-system'."); |
02ba4723 KH |
3897 | Vprocess_coding_system_alist = Qnil; |
3898 | ||
3899 | DEFVAR_LISP ("network-coding-system-alist", &Vnetwork_coding_system_alist, | |
3900 | "Alist to decide a coding system to use for a network I/O operation.\n\ | |
3901 | The format is ((PATTERN . VAL) ...),\n\ | |
3902 | where PATTERN is a regular expression matching a network service name\n\ | |
3903 | or is a port number to connect to,\n\ | |
3904 | VAL is a coding system, a cons of coding systems, or a function symbol.\n\ | |
3905 | If VAL is a coding system, it is used for both decoding what received\n\ | |
3906 | from the network stream and encoding what sent to the network stream.\n\ | |
3907 | If VAL is a cons of coding systems, the car part is used for decoding,\n\ | |
3908 | and the cdr part is used for encoding.\n\ | |
3909 | If VAL is a function symbol, the function must return a coding system\n\ | |
3910 | or a cons of coding systems which are used as above.\n\ | |
4ed46869 | 3911 | \n\ |
9ce27fde | 3912 | See also the function `find-operation-coding-system'."); |
02ba4723 | 3913 | Vnetwork_coding_system_alist = Qnil; |
4ed46869 KH |
3914 | |
3915 | DEFVAR_INT ("eol-mnemonic-unix", &eol_mnemonic_unix, | |
3916 | "Mnemonic character indicating UNIX-like end-of-line format (i.e. LF) ."); | |
458822a0 | 3917 | eol_mnemonic_unix = ':'; |
4ed46869 KH |
3918 | |
3919 | DEFVAR_INT ("eol-mnemonic-dos", &eol_mnemonic_dos, | |
3920 | "Mnemonic character indicating DOS-like end-of-line format (i.e. CRLF)."); | |
458822a0 | 3921 | eol_mnemonic_dos = '\\'; |
4ed46869 KH |
3922 | |
3923 | DEFVAR_INT ("eol-mnemonic-mac", &eol_mnemonic_mac, | |
3924 | "Mnemonic character indicating MAC-like end-of-line format (i.e. CR)."); | |
458822a0 | 3925 | eol_mnemonic_mac = '/'; |
4ed46869 KH |
3926 | |
3927 | DEFVAR_INT ("eol-mnemonic-undecided", &eol_mnemonic_undecided, | |
3928 | "Mnemonic character indicating end-of-line format is not yet decided."); | |
458822a0 | 3929 | eol_mnemonic_undecided = ':'; |
4ed46869 | 3930 | |
bdd9fb48 KH |
3931 | DEFVAR_LISP ("enable-character-unification", &Venable_character_unification, |
3932 | "Non-nil means ISO 2022 encoder/decoder do character unification."); | |
3933 | Venable_character_unification = Qt; | |
3934 | ||
a5d301df KH |
3935 | DEFVAR_LISP ("standard-character-unification-table-for-decode", |
3936 | &Vstandard_character_unification_table_for_decode, | |
bdd9fb48 | 3937 | "Table for unifying characters when reading."); |
a5d301df | 3938 | Vstandard_character_unification_table_for_decode = Qnil; |
bdd9fb48 | 3939 | |
a5d301df KH |
3940 | DEFVAR_LISP ("standard-character-unification-table-for-encode", |
3941 | &Vstandard_character_unification_table_for_encode, | |
bdd9fb48 | 3942 | "Table for unifying characters when writing."); |
a5d301df | 3943 | Vstandard_character_unification_table_for_encode = Qnil; |
4ed46869 KH |
3944 | |
3945 | DEFVAR_LISP ("charset-revision-table", &Vcharset_revision_alist, | |
3946 | "Alist of charsets vs revision numbers.\n\ | |
3947 | While encoding, if a charset (car part of an element) is found,\n\ | |
3948 | designate it with the escape sequence identifing revision (cdr part of the element)."); | |
3949 | Vcharset_revision_alist = Qnil; | |
02ba4723 KH |
3950 | |
3951 | DEFVAR_LISP ("default-process-coding-system", | |
3952 | &Vdefault_process_coding_system, | |
3953 | "Cons of coding systems used for process I/O by default.\n\ | |
3954 | The car part is used for decoding a process output,\n\ | |
3955 | the cdr part is used for encoding a text to be sent to a process."); | |
3956 | Vdefault_process_coding_system = Qnil; | |
4ed46869 KH |
3957 | } |
3958 | ||
3959 | #endif /* emacs */ |