| 1 | /* Copyright (C) 1995,1996,1998,2000,2001, 2004, 2006, 2008, 2009, 2010 Free Software Foundation, Inc. |
| 2 | * |
| 3 | * This library is free software; you can redistribute it and/or |
| 4 | * modify it under the terms of the GNU Lesser General Public License |
| 5 | * as published by the Free Software Foundation; either version 3 of |
| 6 | * the License, or (at your option) any later version. |
| 7 | * |
| 8 | * This library is distributed in the hope that it will be useful, but |
| 9 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 11 | * Lesser General Public License for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU Lesser General Public |
| 14 | * License along with this library; if not, write to the Free Software |
| 15 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 16 | * 02110-1301 USA |
| 17 | */ |
| 18 | |
| 19 | |
| 20 | \f |
| 21 | #ifdef HAVE_CONFIG_H |
| 22 | # include <config.h> |
| 23 | #endif |
| 24 | |
| 25 | #include <string.h> |
| 26 | #include <stdio.h> |
| 27 | #include <ctype.h> |
| 28 | #include <uninorm.h> |
| 29 | #include <unistr.h> |
| 30 | #include <uniconv.h> |
| 31 | |
| 32 | #include "striconveh.h" |
| 33 | |
| 34 | #include "libguile/_scm.h" |
| 35 | #include "libguile/chars.h" |
| 36 | #include "libguile/root.h" |
| 37 | #include "libguile/strings.h" |
| 38 | #include "libguile/error.h" |
| 39 | #include "libguile/generalized-vectors.h" |
| 40 | #include "libguile/deprecation.h" |
| 41 | #include "libguile/validate.h" |
| 42 | |
| 43 | \f |
| 44 | |
| 45 | /* {Strings} |
| 46 | */ |
| 47 | |
| 48 | |
| 49 | /* Stringbufs |
| 50 | * |
| 51 | * XXX - keeping an accurate refcount during GC seems to be quite |
| 52 | * tricky, so we just keep score of whether a stringbuf might be |
| 53 | * shared, not whether it definitely is. |
| 54 | * |
| 55 | * The scheme I (mvo) tried to keep an accurate reference count would |
| 56 | * recount all strings that point to a stringbuf during the mark-phase |
| 57 | * of the GC. This was done since one cannot access the stringbuf of |
| 58 | * a string when that string is freed (in order to decrease the |
| 59 | * reference count). The memory of the stringbuf might have been |
| 60 | * reused already for something completely different. |
| 61 | * |
| 62 | * This recounted worked for a small number of threads beating on |
| 63 | * cow-strings, but it failed randomly with more than 10 threads, say. |
| 64 | * I couldn't figure out what went wrong, so I used the conservative |
| 65 | * approach implemented below. |
| 66 | * |
| 67 | * There are 2 storage strategies for stringbufs: 8-bit and wide. 8-bit |
| 68 | * strings are ISO-8859-1-encoded strings; wide strings are 32-bit (UCS-4) |
| 69 | * strings. |
| 70 | */ |
| 71 | |
| 72 | /* The size in words of the stringbuf header (type tag + size). */ |
| 73 | #define STRINGBUF_HEADER_SIZE 2U |
| 74 | |
| 75 | #define STRINGBUF_HEADER_BYTES (STRINGBUF_HEADER_SIZE * sizeof (SCM)) |
| 76 | |
| 77 | #define STRINGBUF_F_SHARED SCM_I_STRINGBUF_F_SHARED |
| 78 | #define STRINGBUF_F_WIDE SCM_I_STRINGBUF_F_WIDE |
| 79 | |
| 80 | #define STRINGBUF_TAG scm_tc7_stringbuf |
| 81 | #define STRINGBUF_SHARED(buf) (SCM_CELL_WORD_0(buf) & STRINGBUF_F_SHARED) |
| 82 | #define STRINGBUF_WIDE(buf) (SCM_CELL_WORD_0(buf) & STRINGBUF_F_WIDE) |
| 83 | |
| 84 | #define STRINGBUF_CHARS(buf) ((unsigned char *) \ |
| 85 | SCM_CELL_OBJECT_LOC (buf, \ |
| 86 | STRINGBUF_HEADER_SIZE)) |
| 87 | #define STRINGBUF_LENGTH(buf) (SCM_CELL_WORD_1 (buf)) |
| 88 | |
| 89 | #define STRINGBUF_WIDE_CHARS(buf) ((scm_t_wchar *) STRINGBUF_CHARS (buf)) |
| 90 | |
| 91 | #define SET_STRINGBUF_SHARED(buf) \ |
| 92 | do \ |
| 93 | { \ |
| 94 | /* Don't modify BUF if it's already marked as shared since it might be \ |
| 95 | a read-only, statically allocated stringbuf. */ \ |
| 96 | if (SCM_LIKELY (!STRINGBUF_SHARED (buf))) \ |
| 97 | SCM_SET_CELL_WORD_0 ((buf), SCM_CELL_WORD_0 (buf) | STRINGBUF_F_SHARED); \ |
| 98 | } \ |
| 99 | while (0) |
| 100 | |
| 101 | #ifdef SCM_STRING_LENGTH_HISTOGRAM |
| 102 | static size_t lenhist[1001]; |
| 103 | #endif |
| 104 | |
| 105 | /* Make a stringbuf with space for LEN 8-bit Latin-1-encoded |
| 106 | characters. */ |
| 107 | static SCM |
| 108 | make_stringbuf (size_t len) |
| 109 | { |
| 110 | /* XXX - for the benefit of SCM_STRING_CHARS, SCM_SYMBOL_CHARS and |
| 111 | scm_i_symbol_chars, all stringbufs are null-terminated. Once |
| 112 | SCM_STRING_CHARS and SCM_SYMBOL_CHARS are removed and the code |
| 113 | has been changed for scm_i_symbol_chars, this null-termination |
| 114 | can be dropped. |
| 115 | */ |
| 116 | |
| 117 | SCM buf; |
| 118 | |
| 119 | #ifdef SCM_STRING_LENGTH_HISTOGRAM |
| 120 | if (len < 1000) |
| 121 | lenhist[len]++; |
| 122 | else |
| 123 | lenhist[1000]++; |
| 124 | #endif |
| 125 | |
| 126 | buf = PTR2SCM (scm_gc_malloc_pointerless (STRINGBUF_HEADER_BYTES + len + 1, |
| 127 | "string")); |
| 128 | |
| 129 | SCM_SET_CELL_TYPE (buf, STRINGBUF_TAG); |
| 130 | SCM_SET_CELL_WORD_1 (buf, (scm_t_bits) len); |
| 131 | |
| 132 | STRINGBUF_CHARS (buf)[len] = 0; |
| 133 | |
| 134 | return buf; |
| 135 | } |
| 136 | |
| 137 | /* Make a stringbuf with space for LEN 32-bit UCS-4-encoded |
| 138 | characters. */ |
| 139 | static SCM |
| 140 | make_wide_stringbuf (size_t len) |
| 141 | { |
| 142 | SCM buf; |
| 143 | size_t raw_len; |
| 144 | |
| 145 | #ifdef SCM_STRING_LENGTH_HISTOGRAM |
| 146 | if (len < 1000) |
| 147 | lenhist[len]++; |
| 148 | else |
| 149 | lenhist[1000]++; |
| 150 | #endif |
| 151 | |
| 152 | raw_len = (len + 1) * sizeof (scm_t_wchar); |
| 153 | buf = PTR2SCM (scm_gc_malloc_pointerless (STRINGBUF_HEADER_BYTES + raw_len, |
| 154 | "string")); |
| 155 | |
| 156 | SCM_SET_CELL_TYPE (buf, STRINGBUF_TAG | STRINGBUF_F_WIDE); |
| 157 | SCM_SET_CELL_WORD_1 (buf, (scm_t_bits) len); |
| 158 | |
| 159 | STRINGBUF_WIDE_CHARS (buf)[len] = 0; |
| 160 | |
| 161 | return buf; |
| 162 | } |
| 163 | |
| 164 | /* Return a UCS-4-encoded stringbuf containing the (possibly Latin-1-encoded) |
| 165 | characters from BUF. */ |
| 166 | static SCM |
| 167 | wide_stringbuf (SCM buf) |
| 168 | { |
| 169 | SCM new_buf; |
| 170 | |
| 171 | if (STRINGBUF_WIDE (buf)) |
| 172 | new_buf = buf; |
| 173 | else |
| 174 | { |
| 175 | size_t i, len; |
| 176 | scm_t_wchar *mem; |
| 177 | |
| 178 | len = STRINGBUF_LENGTH (buf); |
| 179 | |
| 180 | new_buf = make_wide_stringbuf (len); |
| 181 | |
| 182 | mem = STRINGBUF_WIDE_CHARS (new_buf); |
| 183 | for (i = 0; i < len; i++) |
| 184 | mem[i] = (scm_t_wchar) STRINGBUF_CHARS (buf)[i]; |
| 185 | mem[len] = 0; |
| 186 | } |
| 187 | |
| 188 | return new_buf; |
| 189 | } |
| 190 | |
| 191 | /* Return a Latin-1-encoded stringbuf containing the (possibly UCS-4-encoded) |
| 192 | characters from BUF, if possible. */ |
| 193 | static SCM |
| 194 | narrow_stringbuf (SCM buf) |
| 195 | { |
| 196 | SCM new_buf; |
| 197 | |
| 198 | if (!STRINGBUF_WIDE (buf)) |
| 199 | new_buf = buf; |
| 200 | else |
| 201 | { |
| 202 | size_t i, len; |
| 203 | scm_t_wchar *wmem; |
| 204 | unsigned char *mem; |
| 205 | |
| 206 | len = STRINGBUF_LENGTH (buf); |
| 207 | wmem = STRINGBUF_WIDE_CHARS (buf); |
| 208 | |
| 209 | for (i = 0; i < len; i++) |
| 210 | if (wmem[i] > 0xFF) |
| 211 | /* BUF cannot be narrowed. */ |
| 212 | return buf; |
| 213 | |
| 214 | new_buf = make_stringbuf (len); |
| 215 | |
| 216 | mem = STRINGBUF_CHARS (new_buf); |
| 217 | for (i = 0; i < len; i++) |
| 218 | mem[i] = (unsigned char) wmem[i]; |
| 219 | mem[len] = 0; |
| 220 | } |
| 221 | |
| 222 | return new_buf; |
| 223 | } |
| 224 | |
| 225 | scm_i_pthread_mutex_t stringbuf_write_mutex = SCM_I_PTHREAD_MUTEX_INITIALIZER; |
| 226 | |
| 227 | \f |
| 228 | /* Copy-on-write strings. |
| 229 | */ |
| 230 | |
| 231 | #define STRING_TAG scm_tc7_string |
| 232 | |
| 233 | #define STRING_STRINGBUF(str) (SCM_CELL_OBJECT_1(str)) |
| 234 | #define STRING_START(str) ((size_t)SCM_CELL_WORD_2(str)) |
| 235 | #define STRING_LENGTH(str) ((size_t)SCM_CELL_WORD_3(str)) |
| 236 | |
| 237 | #define SET_STRING_STRINGBUF(str,buf) (SCM_SET_CELL_OBJECT_1(str,buf)) |
| 238 | #define SET_STRING_START(str,start) (SCM_SET_CELL_WORD_2(str,start)) |
| 239 | |
| 240 | #define IS_STRING(str) (SCM_NIMP(str) && SCM_TYP7(str) == STRING_TAG) |
| 241 | |
| 242 | /* Read-only strings. |
| 243 | */ |
| 244 | |
| 245 | #define RO_STRING_TAG scm_tc7_ro_string |
| 246 | #define IS_RO_STRING(str) (SCM_CELL_TYPE(str)==RO_STRING_TAG) |
| 247 | |
| 248 | /* Mutation-sharing substrings |
| 249 | */ |
| 250 | |
| 251 | #define SH_STRING_TAG (scm_tc7_string + 0x100) |
| 252 | |
| 253 | #define SH_STRING_STRING(sh) (SCM_CELL_OBJECT_1(sh)) |
| 254 | /* START and LENGTH as for STRINGs. */ |
| 255 | |
| 256 | #define IS_SH_STRING(str) (SCM_CELL_TYPE(str)==SH_STRING_TAG) |
| 257 | |
| 258 | SCM scm_nullstr; |
| 259 | |
| 260 | /* Create a scheme string with space for LEN 8-bit Latin-1-encoded |
| 261 | characters. CHARSP, if not NULL, will be set to location of the |
| 262 | char array. */ |
| 263 | SCM |
| 264 | scm_i_make_string (size_t len, char **charsp) |
| 265 | { |
| 266 | SCM buf = make_stringbuf (len); |
| 267 | SCM res; |
| 268 | if (charsp) |
| 269 | *charsp = (char *) STRINGBUF_CHARS (buf); |
| 270 | res = scm_double_cell (STRING_TAG, SCM_UNPACK(buf), |
| 271 | (scm_t_bits)0, (scm_t_bits) len); |
| 272 | return res; |
| 273 | } |
| 274 | |
| 275 | /* Create a scheme string with space for LEN 32-bit UCS-4-encoded |
| 276 | characters. CHARSP, if not NULL, will be set to location of the |
| 277 | character array. */ |
| 278 | SCM |
| 279 | scm_i_make_wide_string (size_t len, scm_t_wchar **charsp) |
| 280 | { |
| 281 | SCM buf = make_wide_stringbuf (len); |
| 282 | SCM res; |
| 283 | if (charsp) |
| 284 | *charsp = STRINGBUF_WIDE_CHARS (buf); |
| 285 | res = scm_double_cell (STRING_TAG, SCM_UNPACK (buf), |
| 286 | (scm_t_bits) 0, (scm_t_bits) len); |
| 287 | return res; |
| 288 | } |
| 289 | |
| 290 | static void |
| 291 | validate_substring_args (SCM str, size_t start, size_t end) |
| 292 | { |
| 293 | if (!IS_STRING (str)) |
| 294 | scm_wrong_type_arg_msg (NULL, 0, str, "string"); |
| 295 | if (start > STRING_LENGTH (str)) |
| 296 | scm_out_of_range (NULL, scm_from_size_t (start)); |
| 297 | if (end > STRING_LENGTH (str) || end < start) |
| 298 | scm_out_of_range (NULL, scm_from_size_t (end)); |
| 299 | } |
| 300 | |
| 301 | static inline void |
| 302 | get_str_buf_start (SCM *str, SCM *buf, size_t *start) |
| 303 | { |
| 304 | *start = STRING_START (*str); |
| 305 | if (IS_SH_STRING (*str)) |
| 306 | { |
| 307 | *str = SH_STRING_STRING (*str); |
| 308 | *start += STRING_START (*str); |
| 309 | } |
| 310 | *buf = STRING_STRINGBUF (*str); |
| 311 | } |
| 312 | |
| 313 | SCM |
| 314 | scm_i_substring (SCM str, size_t start, size_t end) |
| 315 | { |
| 316 | SCM buf; |
| 317 | size_t str_start; |
| 318 | get_str_buf_start (&str, &buf, &str_start); |
| 319 | scm_i_pthread_mutex_lock (&stringbuf_write_mutex); |
| 320 | SET_STRINGBUF_SHARED (buf); |
| 321 | scm_i_pthread_mutex_unlock (&stringbuf_write_mutex); |
| 322 | return scm_double_cell (STRING_TAG, SCM_UNPACK(buf), |
| 323 | (scm_t_bits)str_start + start, |
| 324 | (scm_t_bits) end - start); |
| 325 | } |
| 326 | |
| 327 | SCM |
| 328 | scm_i_substring_read_only (SCM str, size_t start, size_t end) |
| 329 | { |
| 330 | SCM buf; |
| 331 | size_t str_start; |
| 332 | get_str_buf_start (&str, &buf, &str_start); |
| 333 | scm_i_pthread_mutex_lock (&stringbuf_write_mutex); |
| 334 | SET_STRINGBUF_SHARED (buf); |
| 335 | scm_i_pthread_mutex_unlock (&stringbuf_write_mutex); |
| 336 | return scm_double_cell (RO_STRING_TAG, SCM_UNPACK(buf), |
| 337 | (scm_t_bits)str_start + start, |
| 338 | (scm_t_bits) end - start); |
| 339 | } |
| 340 | |
| 341 | SCM |
| 342 | scm_i_substring_copy (SCM str, size_t start, size_t end) |
| 343 | { |
| 344 | size_t len = end - start; |
| 345 | SCM buf, my_buf; |
| 346 | size_t str_start; |
| 347 | get_str_buf_start (&str, &buf, &str_start); |
| 348 | if (scm_i_is_narrow_string (str)) |
| 349 | { |
| 350 | my_buf = make_stringbuf (len); |
| 351 | memcpy (STRINGBUF_CHARS (my_buf), |
| 352 | STRINGBUF_CHARS (buf) + str_start + start, len); |
| 353 | } |
| 354 | else |
| 355 | { |
| 356 | my_buf = make_wide_stringbuf (len); |
| 357 | u32_cpy ((scm_t_uint32 *) STRINGBUF_WIDE_CHARS (my_buf), |
| 358 | (scm_t_uint32 *) (STRINGBUF_WIDE_CHARS (buf) + str_start |
| 359 | + start), len); |
| 360 | /* Even though this string is wide, the substring may be narrow. |
| 361 | Consider adding code to narrow the string. */ |
| 362 | } |
| 363 | scm_remember_upto_here_1 (buf); |
| 364 | return scm_double_cell (STRING_TAG, SCM_UNPACK (my_buf), |
| 365 | (scm_t_bits) 0, (scm_t_bits) len); |
| 366 | } |
| 367 | |
| 368 | SCM |
| 369 | scm_i_substring_shared (SCM str, size_t start, size_t end) |
| 370 | { |
| 371 | if (start == 0 && end == STRING_LENGTH (str)) |
| 372 | return str; |
| 373 | else |
| 374 | { |
| 375 | size_t len = end - start; |
| 376 | if (IS_SH_STRING (str)) |
| 377 | { |
| 378 | start += STRING_START (str); |
| 379 | str = SH_STRING_STRING (str); |
| 380 | } |
| 381 | return scm_double_cell (SH_STRING_TAG, SCM_UNPACK(str), |
| 382 | (scm_t_bits)start, (scm_t_bits) len); |
| 383 | } |
| 384 | } |
| 385 | |
| 386 | SCM |
| 387 | scm_c_substring (SCM str, size_t start, size_t end) |
| 388 | { |
| 389 | validate_substring_args (str, start, end); |
| 390 | return scm_i_substring (str, start, end); |
| 391 | } |
| 392 | |
| 393 | SCM |
| 394 | scm_c_substring_read_only (SCM str, size_t start, size_t end) |
| 395 | { |
| 396 | validate_substring_args (str, start, end); |
| 397 | return scm_i_substring_read_only (str, start, end); |
| 398 | } |
| 399 | |
| 400 | SCM |
| 401 | scm_c_substring_copy (SCM str, size_t start, size_t end) |
| 402 | { |
| 403 | validate_substring_args (str, start, end); |
| 404 | return scm_i_substring_copy (str, start, end); |
| 405 | } |
| 406 | |
| 407 | SCM |
| 408 | scm_c_substring_shared (SCM str, size_t start, size_t end) |
| 409 | { |
| 410 | validate_substring_args (str, start, end); |
| 411 | return scm_i_substring_shared (str, start, end); |
| 412 | } |
| 413 | |
| 414 | \f |
| 415 | /* Internal accessors |
| 416 | */ |
| 417 | |
| 418 | /* Returns the number of characters in STR. This may be different |
| 419 | than the memory size of the string storage. */ |
| 420 | size_t |
| 421 | scm_i_string_length (SCM str) |
| 422 | { |
| 423 | return STRING_LENGTH (str); |
| 424 | } |
| 425 | |
| 426 | /* True if the string is 'narrow', meaning it has a 8-bit Latin-1 |
| 427 | encoding. False if it is 'wide', having a 32-bit UCS-4 |
| 428 | encoding. */ |
| 429 | int |
| 430 | scm_i_is_narrow_string (SCM str) |
| 431 | { |
| 432 | return !STRINGBUF_WIDE (STRING_STRINGBUF (str)); |
| 433 | } |
| 434 | |
| 435 | /* Try to coerce a string to be narrow. It if is narrow already, do |
| 436 | nothing. If it is wide, shrink it to narrow if none of its |
| 437 | characters are above 0xFF. Return true if the string is narrow or |
| 438 | was made to be narrow. */ |
| 439 | int |
| 440 | scm_i_try_narrow_string (SCM str) |
| 441 | { |
| 442 | SET_STRING_STRINGBUF (str, narrow_stringbuf (STRING_STRINGBUF (str))); |
| 443 | |
| 444 | return scm_i_is_narrow_string (str); |
| 445 | } |
| 446 | |
| 447 | /* Returns a pointer to the 8-bit Latin-1 encoded character array of |
| 448 | STR. */ |
| 449 | const char * |
| 450 | scm_i_string_chars (SCM str) |
| 451 | { |
| 452 | SCM buf; |
| 453 | size_t start; |
| 454 | get_str_buf_start (&str, &buf, &start); |
| 455 | if (scm_i_is_narrow_string (str)) |
| 456 | return (const char *) STRINGBUF_CHARS (buf) + start; |
| 457 | else |
| 458 | scm_misc_error (NULL, "Invalid read access of chars of wide string: ~s", |
| 459 | scm_list_1 (str)); |
| 460 | return NULL; |
| 461 | } |
| 462 | |
| 463 | /* Returns a pointer to the 32-bit UCS-4 encoded character array of |
| 464 | STR. */ |
| 465 | const scm_t_wchar * |
| 466 | scm_i_string_wide_chars (SCM str) |
| 467 | { |
| 468 | SCM buf; |
| 469 | size_t start; |
| 470 | |
| 471 | get_str_buf_start (&str, &buf, &start); |
| 472 | if (!scm_i_is_narrow_string (str)) |
| 473 | return (const scm_t_wchar *) STRINGBUF_WIDE_CHARS (buf) + start; |
| 474 | else |
| 475 | scm_misc_error (NULL, "Invalid read access of chars of narrow string: ~s", |
| 476 | scm_list_1 (str)); |
| 477 | } |
| 478 | |
| 479 | /* If the buffer in ORIG_STR is shared, copy ORIG_STR's characters to |
| 480 | a new string buffer, so that it can be modified without modifying |
| 481 | other strings. Also, lock the string mutex. Later, one must call |
| 482 | scm_i_string_stop_writing to unlock the mutex. */ |
| 483 | SCM |
| 484 | scm_i_string_start_writing (SCM orig_str) |
| 485 | { |
| 486 | SCM buf, str = orig_str; |
| 487 | size_t start; |
| 488 | |
| 489 | get_str_buf_start (&str, &buf, &start); |
| 490 | if (IS_RO_STRING (str)) |
| 491 | scm_misc_error (NULL, "string is read-only: ~s", scm_list_1 (orig_str)); |
| 492 | |
| 493 | scm_i_pthread_mutex_lock (&stringbuf_write_mutex); |
| 494 | if (STRINGBUF_SHARED (buf)) |
| 495 | { |
| 496 | /* Clone the stringbuf. */ |
| 497 | size_t len = STRING_LENGTH (str); |
| 498 | SCM new_buf; |
| 499 | |
| 500 | scm_i_pthread_mutex_unlock (&stringbuf_write_mutex); |
| 501 | |
| 502 | if (scm_i_is_narrow_string (str)) |
| 503 | { |
| 504 | new_buf = make_stringbuf (len); |
| 505 | memcpy (STRINGBUF_CHARS (new_buf), |
| 506 | STRINGBUF_CHARS (buf) + STRING_START (str), len); |
| 507 | |
| 508 | } |
| 509 | else |
| 510 | { |
| 511 | new_buf = make_wide_stringbuf (len); |
| 512 | u32_cpy ((scm_t_uint32 *) STRINGBUF_WIDE_CHARS (new_buf), |
| 513 | (scm_t_uint32 *) (STRINGBUF_WIDE_CHARS (buf) |
| 514 | + STRING_START (str)), len); |
| 515 | } |
| 516 | |
| 517 | SET_STRING_STRINGBUF (str, new_buf); |
| 518 | start -= STRING_START (str); |
| 519 | |
| 520 | /* FIXME: The following operations are not atomic, so other threads |
| 521 | looking at STR may see an inconsistent state. Nevertheless it can't |
| 522 | hurt much since (i) accessing STR while it is being mutated can't |
| 523 | yield a crash, and (ii) concurrent accesses to STR should be |
| 524 | protected by a mutex at the application level. The latter may not |
| 525 | apply when STR != ORIG_STR, though. */ |
| 526 | SET_STRING_START (str, 0); |
| 527 | SET_STRING_STRINGBUF (str, new_buf); |
| 528 | |
| 529 | buf = new_buf; |
| 530 | |
| 531 | scm_i_pthread_mutex_lock (&stringbuf_write_mutex); |
| 532 | } |
| 533 | return orig_str; |
| 534 | } |
| 535 | |
| 536 | /* Return a pointer to the 8-bit Latin-1 chars of a string. */ |
| 537 | char * |
| 538 | scm_i_string_writable_chars (SCM str) |
| 539 | { |
| 540 | SCM buf; |
| 541 | size_t start; |
| 542 | |
| 543 | get_str_buf_start (&str, &buf, &start); |
| 544 | if (scm_i_is_narrow_string (str)) |
| 545 | return (char *) STRINGBUF_CHARS (buf) + start; |
| 546 | else |
| 547 | scm_misc_error (NULL, "Invalid write access of chars of wide string: ~s", |
| 548 | scm_list_1 (str)); |
| 549 | return NULL; |
| 550 | } |
| 551 | |
| 552 | /* Return a pointer to the UCS-4 codepoints of a string. */ |
| 553 | static scm_t_wchar * |
| 554 | scm_i_string_writable_wide_chars (SCM str) |
| 555 | { |
| 556 | SCM buf; |
| 557 | size_t start; |
| 558 | |
| 559 | get_str_buf_start (&str, &buf, &start); |
| 560 | if (!scm_i_is_narrow_string (str)) |
| 561 | return STRINGBUF_WIDE_CHARS (buf) + start; |
| 562 | else |
| 563 | scm_misc_error (NULL, "Invalid write access of chars of narrow string: ~s", |
| 564 | scm_list_1 (str)); |
| 565 | } |
| 566 | |
| 567 | /* Unlock the string mutex that was locked when |
| 568 | scm_i_string_start_writing was called. */ |
| 569 | void |
| 570 | scm_i_string_stop_writing (void) |
| 571 | { |
| 572 | scm_i_pthread_mutex_unlock (&stringbuf_write_mutex); |
| 573 | } |
| 574 | |
| 575 | /* Return the Xth character of STR as a UCS-4 codepoint. */ |
| 576 | scm_t_wchar |
| 577 | scm_i_string_ref (SCM str, size_t x) |
| 578 | { |
| 579 | if (scm_i_is_narrow_string (str)) |
| 580 | return (scm_t_wchar) (unsigned char) (scm_i_string_chars (str)[x]); |
| 581 | else |
| 582 | return scm_i_string_wide_chars (str)[x]; |
| 583 | } |
| 584 | |
| 585 | /* Returns index+1 of the first char in STR that matches C, or |
| 586 | 0 if the char is not found. */ |
| 587 | int |
| 588 | scm_i_string_contains_char (SCM str, char ch) |
| 589 | { |
| 590 | size_t i; |
| 591 | size_t len = scm_i_string_length (str); |
| 592 | |
| 593 | i = 0; |
| 594 | if (scm_i_is_narrow_string (str)) |
| 595 | { |
| 596 | while (i < len) |
| 597 | { |
| 598 | if (scm_i_string_chars (str)[i] == ch) |
| 599 | return i+1; |
| 600 | i++; |
| 601 | } |
| 602 | } |
| 603 | else |
| 604 | { |
| 605 | while (i < len) |
| 606 | { |
| 607 | if (scm_i_string_wide_chars (str)[i] |
| 608 | == (unsigned char) ch) |
| 609 | return i+1; |
| 610 | i++; |
| 611 | } |
| 612 | } |
| 613 | return 0; |
| 614 | } |
| 615 | |
| 616 | int |
| 617 | scm_i_string_strcmp (SCM sstr, size_t start_x, const char *cstr) |
| 618 | { |
| 619 | if (scm_i_is_narrow_string (sstr)) |
| 620 | { |
| 621 | const char *a = scm_i_string_chars (sstr) + start_x; |
| 622 | const char *b = cstr; |
| 623 | return strncmp (a, b, strlen(b)); |
| 624 | } |
| 625 | else |
| 626 | { |
| 627 | size_t i; |
| 628 | const scm_t_wchar *a = scm_i_string_wide_chars (sstr) + start_x; |
| 629 | const char *b = cstr; |
| 630 | for (i = 0; i < strlen (b); i++) |
| 631 | { |
| 632 | if (a[i] != (unsigned char) b[i]) |
| 633 | return 1; |
| 634 | } |
| 635 | } |
| 636 | return 0; |
| 637 | } |
| 638 | |
| 639 | /* Set the Pth character of STR to UCS-4 codepoint CHR. */ |
| 640 | void |
| 641 | scm_i_string_set_x (SCM str, size_t p, scm_t_wchar chr) |
| 642 | { |
| 643 | if (chr > 0xFF && scm_i_is_narrow_string (str)) |
| 644 | SET_STRING_STRINGBUF (str, wide_stringbuf (STRING_STRINGBUF (str))); |
| 645 | |
| 646 | if (scm_i_is_narrow_string (str)) |
| 647 | { |
| 648 | char *dst = scm_i_string_writable_chars (str); |
| 649 | dst[p] = chr; |
| 650 | } |
| 651 | else |
| 652 | { |
| 653 | scm_t_wchar *dst = scm_i_string_writable_wide_chars (str); |
| 654 | dst[p] = chr; |
| 655 | } |
| 656 | } |
| 657 | |
| 658 | \f |
| 659 | /* Symbols. |
| 660 | |
| 661 | Basic symbol creation and accessing is done here, the rest is in |
| 662 | symbols.[hc]. This has been done to keep stringbufs and the |
| 663 | internals of strings and string-like objects confined to this file. |
| 664 | */ |
| 665 | |
| 666 | #define SYMBOL_STRINGBUF SCM_CELL_OBJECT_1 |
| 667 | |
| 668 | SCM |
| 669 | scm_i_make_symbol (SCM name, scm_t_bits flags, |
| 670 | unsigned long hash, SCM props) |
| 671 | { |
| 672 | SCM buf; |
| 673 | size_t start = STRING_START (name); |
| 674 | size_t length = STRING_LENGTH (name); |
| 675 | |
| 676 | if (IS_SH_STRING (name)) |
| 677 | { |
| 678 | name = SH_STRING_STRING (name); |
| 679 | start += STRING_START (name); |
| 680 | } |
| 681 | buf = SYMBOL_STRINGBUF (name); |
| 682 | |
| 683 | if (start == 0 && length == STRINGBUF_LENGTH (buf)) |
| 684 | { |
| 685 | /* reuse buf. */ |
| 686 | scm_i_pthread_mutex_lock (&stringbuf_write_mutex); |
| 687 | SET_STRINGBUF_SHARED (buf); |
| 688 | scm_i_pthread_mutex_unlock (&stringbuf_write_mutex); |
| 689 | } |
| 690 | else |
| 691 | { |
| 692 | /* make new buf. */ |
| 693 | if (scm_i_is_narrow_string (name)) |
| 694 | { |
| 695 | SCM new_buf = make_stringbuf (length); |
| 696 | memcpy (STRINGBUF_CHARS (new_buf), |
| 697 | STRINGBUF_CHARS (buf) + start, length); |
| 698 | buf = new_buf; |
| 699 | } |
| 700 | else |
| 701 | { |
| 702 | SCM new_buf = make_wide_stringbuf (length); |
| 703 | u32_cpy ((scm_t_uint32 *) STRINGBUF_WIDE_CHARS (new_buf), |
| 704 | (scm_t_uint32 *) STRINGBUF_WIDE_CHARS (buf) + start, |
| 705 | length); |
| 706 | buf = new_buf; |
| 707 | } |
| 708 | } |
| 709 | return scm_double_cell (scm_tc7_symbol | flags, SCM_UNPACK (buf), |
| 710 | (scm_t_bits) hash, SCM_UNPACK (props)); |
| 711 | } |
| 712 | |
| 713 | SCM |
| 714 | scm_i_c_make_symbol (const char *name, size_t len, |
| 715 | scm_t_bits flags, unsigned long hash, SCM props) |
| 716 | { |
| 717 | SCM buf = make_stringbuf (len); |
| 718 | memcpy (STRINGBUF_CHARS (buf), name, len); |
| 719 | |
| 720 | return scm_immutable_double_cell (scm_tc7_symbol | flags, SCM_UNPACK (buf), |
| 721 | (scm_t_bits) hash, SCM_UNPACK (props)); |
| 722 | } |
| 723 | |
| 724 | /* Returns the number of characters in SYM. This may be different |
| 725 | from the memory size of SYM. */ |
| 726 | size_t |
| 727 | scm_i_symbol_length (SCM sym) |
| 728 | { |
| 729 | return STRINGBUF_LENGTH (SYMBOL_STRINGBUF (sym)); |
| 730 | } |
| 731 | |
| 732 | size_t |
| 733 | scm_c_symbol_length (SCM sym) |
| 734 | #define FUNC_NAME "scm_c_symbol_length" |
| 735 | { |
| 736 | SCM_VALIDATE_SYMBOL (1, sym); |
| 737 | |
| 738 | return STRINGBUF_LENGTH (SYMBOL_STRINGBUF (sym)); |
| 739 | } |
| 740 | #undef FUNC_NAME |
| 741 | |
| 742 | /* True if the name of SYM is stored as a Latin-1 encoded string. |
| 743 | False if it is stored as a 32-bit UCS-4-encoded string. */ |
| 744 | int |
| 745 | scm_i_is_narrow_symbol (SCM sym) |
| 746 | { |
| 747 | SCM buf; |
| 748 | |
| 749 | buf = SYMBOL_STRINGBUF (sym); |
| 750 | return !STRINGBUF_WIDE (buf); |
| 751 | } |
| 752 | |
| 753 | /* Returns a pointer to the 8-bit Latin-1 encoded character array that |
| 754 | contains the name of SYM. */ |
| 755 | const char * |
| 756 | scm_i_symbol_chars (SCM sym) |
| 757 | { |
| 758 | SCM buf; |
| 759 | |
| 760 | buf = SYMBOL_STRINGBUF (sym); |
| 761 | if (!STRINGBUF_WIDE (buf)) |
| 762 | return (const char *) STRINGBUF_CHARS (buf); |
| 763 | else |
| 764 | scm_misc_error (NULL, "Invalid access of chars of a wide symbol ~S", |
| 765 | scm_list_1 (sym)); |
| 766 | } |
| 767 | |
| 768 | /* Return a pointer to the 32-bit UCS-4-encoded character array of a |
| 769 | symbol's name. */ |
| 770 | const scm_t_wchar * |
| 771 | scm_i_symbol_wide_chars (SCM sym) |
| 772 | { |
| 773 | SCM buf; |
| 774 | |
| 775 | buf = SYMBOL_STRINGBUF (sym); |
| 776 | if (STRINGBUF_WIDE (buf)) |
| 777 | return (const scm_t_wchar *) STRINGBUF_WIDE_CHARS (buf); |
| 778 | else |
| 779 | scm_misc_error (NULL, "Invalid access of chars of a narrow symbol ~S", |
| 780 | scm_list_1 (sym)); |
| 781 | } |
| 782 | |
| 783 | SCM |
| 784 | scm_i_symbol_substring (SCM sym, size_t start, size_t end) |
| 785 | { |
| 786 | SCM buf = SYMBOL_STRINGBUF (sym); |
| 787 | scm_i_pthread_mutex_lock (&stringbuf_write_mutex); |
| 788 | SET_STRINGBUF_SHARED (buf); |
| 789 | scm_i_pthread_mutex_unlock (&stringbuf_write_mutex); |
| 790 | return scm_double_cell (RO_STRING_TAG, SCM_UNPACK (buf), |
| 791 | (scm_t_bits)start, (scm_t_bits) end - start); |
| 792 | } |
| 793 | |
| 794 | /* Returns the Xth character of symbol SYM as a UCS-4 codepoint. */ |
| 795 | scm_t_wchar |
| 796 | scm_i_symbol_ref (SCM sym, size_t x) |
| 797 | { |
| 798 | if (scm_i_is_narrow_symbol (sym)) |
| 799 | return (scm_t_wchar) (unsigned char) (scm_i_symbol_chars (sym)[x]); |
| 800 | else |
| 801 | return scm_i_symbol_wide_chars (sym)[x]; |
| 802 | } |
| 803 | |
| 804 | /* Debugging |
| 805 | */ |
| 806 | |
| 807 | SCM_DEFINE (scm_sys_string_dump, "%string-dump", 1, 0, 0, (SCM str), |
| 808 | "Returns an association list containing debugging information\n" |
| 809 | "for @var{str}. The association list has the following entries." |
| 810 | "@table @code\n" |
| 811 | "@item string\n" |
| 812 | "The string itself.\n" |
| 813 | "@item start\n" |
| 814 | "The start index of the string into its stringbuf\n" |
| 815 | "@item length\n" |
| 816 | "The length of the string\n" |
| 817 | "@item shared\n" |
| 818 | "If this string is a substring, it returns its parent string.\n" |
| 819 | "Otherwise, it returns @code{#f}\n" |
| 820 | "@item read-only\n" |
| 821 | "@code{#t} if the string is read-only\n" |
| 822 | "@item stringbuf-chars\n" |
| 823 | "A new string containing this string's stringbuf's characters\n" |
| 824 | "@item stringbuf-length\n" |
| 825 | "The number of characters in this stringbuf\n" |
| 826 | "@item stringbuf-shared\n" |
| 827 | "@code{#t} if this stringbuf is shared\n" |
| 828 | "@item stringbuf-wide\n" |
| 829 | "@code{#t} if this stringbuf's characters are stored in a\n" |
| 830 | "32-bit buffer, or @code{#f} if they are stored in an 8-bit\n" |
| 831 | "buffer\n" |
| 832 | "@end table") |
| 833 | #define FUNC_NAME s_scm_sys_string_dump |
| 834 | { |
| 835 | SCM e1, e2, e3, e4, e5, e6, e7, e8, e9; |
| 836 | SCM buf; |
| 837 | SCM_VALIDATE_STRING (1, str); |
| 838 | |
| 839 | /* String info */ |
| 840 | e1 = scm_cons (scm_from_locale_symbol ("string"), |
| 841 | str); |
| 842 | e2 = scm_cons (scm_from_locale_symbol ("start"), |
| 843 | scm_from_size_t (STRING_START (str))); |
| 844 | e3 = scm_cons (scm_from_locale_symbol ("length"), |
| 845 | scm_from_size_t (STRING_LENGTH (str))); |
| 846 | |
| 847 | if (IS_SH_STRING (str)) |
| 848 | { |
| 849 | e4 = scm_cons (scm_from_locale_symbol ("shared"), |
| 850 | SH_STRING_STRING (str)); |
| 851 | buf = STRING_STRINGBUF (SH_STRING_STRING (str)); |
| 852 | } |
| 853 | else |
| 854 | { |
| 855 | e4 = scm_cons (scm_from_locale_symbol ("shared"), |
| 856 | SCM_BOOL_F); |
| 857 | buf = STRING_STRINGBUF (str); |
| 858 | } |
| 859 | |
| 860 | if (IS_RO_STRING (str)) |
| 861 | e5 = scm_cons (scm_from_locale_symbol ("read-only"), |
| 862 | SCM_BOOL_T); |
| 863 | else |
| 864 | e5 = scm_cons (scm_from_locale_symbol ("read-only"), |
| 865 | SCM_BOOL_F); |
| 866 | |
| 867 | /* Stringbuf info */ |
| 868 | if (!STRINGBUF_WIDE (buf)) |
| 869 | { |
| 870 | size_t len = STRINGBUF_LENGTH (buf); |
| 871 | char *cbuf; |
| 872 | SCM sbc = scm_i_make_string (len, &cbuf); |
| 873 | memcpy (cbuf, STRINGBUF_CHARS (buf), len); |
| 874 | e6 = scm_cons (scm_from_locale_symbol ("stringbuf-chars"), |
| 875 | sbc); |
| 876 | } |
| 877 | else |
| 878 | { |
| 879 | size_t len = STRINGBUF_LENGTH (buf); |
| 880 | scm_t_wchar *cbuf; |
| 881 | SCM sbc = scm_i_make_wide_string (len, &cbuf); |
| 882 | u32_cpy ((scm_t_uint32 *) cbuf, |
| 883 | (scm_t_uint32 *) STRINGBUF_WIDE_CHARS (buf), len); |
| 884 | e6 = scm_cons (scm_from_locale_symbol ("stringbuf-chars"), |
| 885 | sbc); |
| 886 | } |
| 887 | e7 = scm_cons (scm_from_locale_symbol ("stringbuf-length"), |
| 888 | scm_from_size_t (STRINGBUF_LENGTH (buf))); |
| 889 | if (STRINGBUF_SHARED (buf)) |
| 890 | e8 = scm_cons (scm_from_locale_symbol ("stringbuf-shared"), |
| 891 | SCM_BOOL_T); |
| 892 | else |
| 893 | e8 = scm_cons (scm_from_locale_symbol ("stringbuf-shared"), |
| 894 | SCM_BOOL_F); |
| 895 | if (STRINGBUF_WIDE (buf)) |
| 896 | e9 = scm_cons (scm_from_locale_symbol ("stringbuf-wide"), |
| 897 | SCM_BOOL_T); |
| 898 | else |
| 899 | e9 = scm_cons (scm_from_locale_symbol ("stringbuf-wide"), |
| 900 | SCM_BOOL_F); |
| 901 | |
| 902 | return scm_list_n (e1, e2, e3, e4, e5, e6, e7, e8, e9, SCM_UNDEFINED); |
| 903 | } |
| 904 | #undef FUNC_NAME |
| 905 | |
| 906 | SCM_DEFINE (scm_sys_symbol_dump, "%symbol-dump", 1, 0, 0, (SCM sym), |
| 907 | "Returns an association list containing debugging information\n" |
| 908 | "for @var{sym}. The association list has the following entries." |
| 909 | "@table @code\n" |
| 910 | "@item symbol\n" |
| 911 | "The symbol itself\n" |
| 912 | "@item hash\n" |
| 913 | "Its hash value\n" |
| 914 | "@item interned\n" |
| 915 | "@code{#t} if it is an interned symbol\n" |
| 916 | "@item stringbuf-chars\n" |
| 917 | "A new string containing this symbols's stringbuf's characters\n" |
| 918 | "@item stringbuf-length\n" |
| 919 | "The number of characters in this stringbuf\n" |
| 920 | "@item stringbuf-shared\n" |
| 921 | "@code{#t} if this stringbuf is shared\n" |
| 922 | "@item stringbuf-wide\n" |
| 923 | "@code{#t} if this stringbuf's characters are stored in a\n" |
| 924 | "32-bit buffer, or @code{#f} if they are stored in an 8-bit\n" |
| 925 | "buffer\n" |
| 926 | "@end table") |
| 927 | #define FUNC_NAME s_scm_sys_symbol_dump |
| 928 | { |
| 929 | SCM e1, e2, e3, e4, e5, e6, e7; |
| 930 | SCM buf; |
| 931 | SCM_VALIDATE_SYMBOL (1, sym); |
| 932 | e1 = scm_cons (scm_from_locale_symbol ("symbol"), |
| 933 | sym); |
| 934 | e2 = scm_cons (scm_from_locale_symbol ("hash"), |
| 935 | scm_from_ulong (scm_i_symbol_hash (sym))); |
| 936 | e3 = scm_cons (scm_from_locale_symbol ("interned"), |
| 937 | scm_symbol_interned_p (sym)); |
| 938 | buf = SYMBOL_STRINGBUF (sym); |
| 939 | |
| 940 | /* Stringbuf info */ |
| 941 | if (!STRINGBUF_WIDE (buf)) |
| 942 | { |
| 943 | size_t len = STRINGBUF_LENGTH (buf); |
| 944 | char *cbuf; |
| 945 | SCM sbc = scm_i_make_string (len, &cbuf); |
| 946 | memcpy (cbuf, STRINGBUF_CHARS (buf), len); |
| 947 | e4 = scm_cons (scm_from_locale_symbol ("stringbuf-chars"), |
| 948 | sbc); |
| 949 | } |
| 950 | else |
| 951 | { |
| 952 | size_t len = STRINGBUF_LENGTH (buf); |
| 953 | scm_t_wchar *cbuf; |
| 954 | SCM sbc = scm_i_make_wide_string (len, &cbuf); |
| 955 | u32_cpy ((scm_t_uint32 *) cbuf, |
| 956 | (scm_t_uint32 *) STRINGBUF_WIDE_CHARS (buf), len); |
| 957 | e4 = scm_cons (scm_from_locale_symbol ("stringbuf-chars"), |
| 958 | sbc); |
| 959 | } |
| 960 | e5 = scm_cons (scm_from_locale_symbol ("stringbuf-length"), |
| 961 | scm_from_size_t (STRINGBUF_LENGTH (buf))); |
| 962 | if (STRINGBUF_SHARED (buf)) |
| 963 | e6 = scm_cons (scm_from_locale_symbol ("stringbuf-shared"), |
| 964 | SCM_BOOL_T); |
| 965 | else |
| 966 | e6 = scm_cons (scm_from_locale_symbol ("stringbuf-shared"), |
| 967 | SCM_BOOL_F); |
| 968 | if (STRINGBUF_WIDE (buf)) |
| 969 | e7 = scm_cons (scm_from_locale_symbol ("stringbuf-wide"), |
| 970 | SCM_BOOL_T); |
| 971 | else |
| 972 | e7 = scm_cons (scm_from_locale_symbol ("stringbuf-wide"), |
| 973 | SCM_BOOL_F); |
| 974 | return scm_list_n (e1, e2, e3, e4, e5, e6, e7, SCM_UNDEFINED); |
| 975 | |
| 976 | } |
| 977 | #undef FUNC_NAME |
| 978 | |
| 979 | #ifdef SCM_STRING_LENGTH_HISTOGRAM |
| 980 | |
| 981 | SCM_DEFINE (scm_sys_stringbuf_hist, "%stringbuf-hist", 0, 0, 0, (void), "") |
| 982 | #define FUNC_NAME s_scm_sys_stringbuf_hist |
| 983 | { |
| 984 | int i; |
| 985 | for (i = 0; i < 1000; i++) |
| 986 | if (lenhist[i]) |
| 987 | fprintf (stderr, " %3d: %u\n", i, lenhist[i]); |
| 988 | fprintf (stderr, ">999: %u\n", lenhist[1000]); |
| 989 | return SCM_UNSPECIFIED; |
| 990 | } |
| 991 | #undef FUNC_NAME |
| 992 | |
| 993 | #endif |
| 994 | |
| 995 | \f |
| 996 | |
| 997 | SCM_DEFINE (scm_string_p, "string?", 1, 0, 0, |
| 998 | (SCM obj), |
| 999 | "Return @code{#t} if @var{obj} is a string, else @code{#f}.") |
| 1000 | #define FUNC_NAME s_scm_string_p |
| 1001 | { |
| 1002 | return scm_from_bool (IS_STRING (obj)); |
| 1003 | } |
| 1004 | #undef FUNC_NAME |
| 1005 | |
| 1006 | |
| 1007 | SCM_REGISTER_PROC (s_scm_list_to_string, "list->string", 1, 0, 0, scm_string); |
| 1008 | |
| 1009 | SCM_DEFINE (scm_string, "string", 0, 0, 1, |
| 1010 | (SCM chrs), |
| 1011 | "@deffnx {Scheme Procedure} list->string chrs\n" |
| 1012 | "Return a newly allocated string composed of the arguments,\n" |
| 1013 | "@var{chrs}.") |
| 1014 | #define FUNC_NAME s_scm_string |
| 1015 | { |
| 1016 | SCM result = SCM_BOOL_F; |
| 1017 | SCM rest; |
| 1018 | size_t len; |
| 1019 | size_t p = 0; |
| 1020 | long i; |
| 1021 | int wide = 0; |
| 1022 | |
| 1023 | /* Verify that this is a list of chars. */ |
| 1024 | i = scm_ilength (chrs); |
| 1025 | SCM_ASSERT (i >= 0, chrs, SCM_ARG1, FUNC_NAME); |
| 1026 | |
| 1027 | len = (size_t) i; |
| 1028 | rest = chrs; |
| 1029 | |
| 1030 | while (len > 0 && scm_is_pair (rest)) |
| 1031 | { |
| 1032 | SCM elt = SCM_CAR (rest); |
| 1033 | SCM_VALIDATE_CHAR (SCM_ARGn, elt); |
| 1034 | if (SCM_CHAR (elt) > 0xFF) |
| 1035 | wide = 1; |
| 1036 | rest = SCM_CDR (rest); |
| 1037 | len--; |
| 1038 | scm_remember_upto_here_1 (elt); |
| 1039 | } |
| 1040 | |
| 1041 | /* Construct a string containing this list of chars. */ |
| 1042 | len = (size_t) i; |
| 1043 | rest = chrs; |
| 1044 | |
| 1045 | if (wide == 0) |
| 1046 | { |
| 1047 | char *buf; |
| 1048 | |
| 1049 | result = scm_i_make_string (len, NULL); |
| 1050 | result = scm_i_string_start_writing (result); |
| 1051 | buf = scm_i_string_writable_chars (result); |
| 1052 | while (len > 0 && scm_is_pair (rest)) |
| 1053 | { |
| 1054 | SCM elt = SCM_CAR (rest); |
| 1055 | buf[p] = (unsigned char) SCM_CHAR (elt); |
| 1056 | p++; |
| 1057 | rest = SCM_CDR (rest); |
| 1058 | len--; |
| 1059 | scm_remember_upto_here_1 (elt); |
| 1060 | } |
| 1061 | } |
| 1062 | else |
| 1063 | { |
| 1064 | scm_t_wchar *buf; |
| 1065 | |
| 1066 | result = scm_i_make_wide_string (len, NULL); |
| 1067 | result = scm_i_string_start_writing (result); |
| 1068 | buf = scm_i_string_writable_wide_chars (result); |
| 1069 | while (len > 0 && scm_is_pair (rest)) |
| 1070 | { |
| 1071 | SCM elt = SCM_CAR (rest); |
| 1072 | buf[p] = SCM_CHAR (elt); |
| 1073 | p++; |
| 1074 | rest = SCM_CDR (rest); |
| 1075 | len--; |
| 1076 | scm_remember_upto_here_1 (elt); |
| 1077 | } |
| 1078 | } |
| 1079 | scm_i_string_stop_writing (); |
| 1080 | |
| 1081 | if (len > 0) |
| 1082 | scm_misc_error (NULL, "list changed while constructing string", SCM_EOL); |
| 1083 | if (!scm_is_null (rest)) |
| 1084 | scm_wrong_type_arg_msg (NULL, 0, chrs, "proper list"); |
| 1085 | |
| 1086 | return result; |
| 1087 | } |
| 1088 | #undef FUNC_NAME |
| 1089 | |
| 1090 | SCM_DEFINE (scm_make_string, "make-string", 1, 1, 0, |
| 1091 | (SCM k, SCM chr), |
| 1092 | "Return a newly allocated string of\n" |
| 1093 | "length @var{k}. If @var{chr} is given, then all elements of\n" |
| 1094 | "the string are initialized to @var{chr}, otherwise the contents\n" |
| 1095 | "of the @var{string} are unspecified.") |
| 1096 | #define FUNC_NAME s_scm_make_string |
| 1097 | { |
| 1098 | return scm_c_make_string (scm_to_size_t (k), chr); |
| 1099 | } |
| 1100 | #undef FUNC_NAME |
| 1101 | |
| 1102 | SCM |
| 1103 | scm_c_make_string (size_t len, SCM chr) |
| 1104 | #define FUNC_NAME NULL |
| 1105 | { |
| 1106 | size_t p; |
| 1107 | SCM res = scm_i_make_string (len, NULL); |
| 1108 | |
| 1109 | if (!SCM_UNBNDP (chr)) |
| 1110 | { |
| 1111 | SCM_VALIDATE_CHAR (0, chr); |
| 1112 | res = scm_i_string_start_writing (res); |
| 1113 | for (p = 0; p < len; p++) |
| 1114 | scm_i_string_set_x (res, p, SCM_CHAR (chr)); |
| 1115 | scm_i_string_stop_writing (); |
| 1116 | } |
| 1117 | |
| 1118 | return res; |
| 1119 | } |
| 1120 | #undef FUNC_NAME |
| 1121 | |
| 1122 | SCM_DEFINE (scm_string_length, "string-length", 1, 0, 0, |
| 1123 | (SCM string), |
| 1124 | "Return the number of characters in @var{string}.") |
| 1125 | #define FUNC_NAME s_scm_string_length |
| 1126 | { |
| 1127 | SCM_VALIDATE_STRING (1, string); |
| 1128 | return scm_from_size_t (STRING_LENGTH (string)); |
| 1129 | } |
| 1130 | #undef FUNC_NAME |
| 1131 | |
| 1132 | SCM_DEFINE (scm_string_bytes_per_char, "string-bytes-per-char", 1, 0, 0, |
| 1133 | (SCM string), |
| 1134 | "Return the bytes used to represent a character in @var{string}." |
| 1135 | "This will return 1 or 4.") |
| 1136 | #define FUNC_NAME s_scm_string_bytes_per_char |
| 1137 | { |
| 1138 | SCM_VALIDATE_STRING (1, string); |
| 1139 | if (!scm_i_is_narrow_string (string)) |
| 1140 | return scm_from_int (4); |
| 1141 | |
| 1142 | return scm_from_int (1); |
| 1143 | } |
| 1144 | #undef FUNC_NAME |
| 1145 | |
| 1146 | size_t |
| 1147 | scm_c_string_length (SCM string) |
| 1148 | { |
| 1149 | if (!IS_STRING (string)) |
| 1150 | scm_wrong_type_arg_msg (NULL, 0, string, "string"); |
| 1151 | return STRING_LENGTH (string); |
| 1152 | } |
| 1153 | |
| 1154 | SCM_DEFINE (scm_string_ref, "string-ref", 2, 0, 0, |
| 1155 | (SCM str, SCM k), |
| 1156 | "Return character @var{k} of @var{str} using zero-origin\n" |
| 1157 | "indexing. @var{k} must be a valid index of @var{str}.") |
| 1158 | #define FUNC_NAME s_scm_string_ref |
| 1159 | { |
| 1160 | size_t len; |
| 1161 | unsigned long idx; |
| 1162 | |
| 1163 | SCM_VALIDATE_STRING (1, str); |
| 1164 | |
| 1165 | len = scm_i_string_length (str); |
| 1166 | if (SCM_LIKELY (len > 0)) |
| 1167 | idx = scm_to_unsigned_integer (k, 0, len - 1); |
| 1168 | else |
| 1169 | scm_out_of_range (NULL, k); |
| 1170 | |
| 1171 | if (scm_i_is_narrow_string (str)) |
| 1172 | return SCM_MAKE_CHAR (scm_i_string_chars (str)[idx]); |
| 1173 | else |
| 1174 | return SCM_MAKE_CHAR (scm_i_string_wide_chars (str)[idx]); |
| 1175 | } |
| 1176 | #undef FUNC_NAME |
| 1177 | |
| 1178 | SCM |
| 1179 | scm_c_string_ref (SCM str, size_t p) |
| 1180 | { |
| 1181 | if (p >= scm_i_string_length (str)) |
| 1182 | scm_out_of_range (NULL, scm_from_size_t (p)); |
| 1183 | if (scm_i_is_narrow_string (str)) |
| 1184 | return SCM_MAKE_CHAR (scm_i_string_chars (str)[p]); |
| 1185 | else |
| 1186 | return SCM_MAKE_CHAR (scm_i_string_wide_chars (str)[p]); |
| 1187 | |
| 1188 | } |
| 1189 | |
| 1190 | SCM_DEFINE (scm_string_set_x, "string-set!", 3, 0, 0, |
| 1191 | (SCM str, SCM k, SCM chr), |
| 1192 | "Store @var{chr} in element @var{k} of @var{str} and return\n" |
| 1193 | "an unspecified value. @var{k} must be a valid index of\n" |
| 1194 | "@var{str}.") |
| 1195 | #define FUNC_NAME s_scm_string_set_x |
| 1196 | { |
| 1197 | size_t len; |
| 1198 | unsigned long idx; |
| 1199 | |
| 1200 | SCM_VALIDATE_STRING (1, str); |
| 1201 | |
| 1202 | len = scm_i_string_length (str); |
| 1203 | if (SCM_LIKELY (len > 0)) |
| 1204 | idx = scm_to_unsigned_integer (k, 0, len - 1); |
| 1205 | else |
| 1206 | scm_out_of_range (NULL, k); |
| 1207 | |
| 1208 | SCM_VALIDATE_CHAR (3, chr); |
| 1209 | str = scm_i_string_start_writing (str); |
| 1210 | scm_i_string_set_x (str, idx, SCM_CHAR (chr)); |
| 1211 | scm_i_string_stop_writing (); |
| 1212 | |
| 1213 | return SCM_UNSPECIFIED; |
| 1214 | } |
| 1215 | #undef FUNC_NAME |
| 1216 | |
| 1217 | void |
| 1218 | scm_c_string_set_x (SCM str, size_t p, SCM chr) |
| 1219 | { |
| 1220 | if (p >= scm_i_string_length (str)) |
| 1221 | scm_out_of_range (NULL, scm_from_size_t (p)); |
| 1222 | str = scm_i_string_start_writing (str); |
| 1223 | scm_i_string_set_x (str, p, SCM_CHAR (chr)); |
| 1224 | scm_i_string_stop_writing (); |
| 1225 | } |
| 1226 | |
| 1227 | SCM_DEFINE (scm_substring, "substring", 2, 1, 0, |
| 1228 | (SCM str, SCM start, SCM end), |
| 1229 | "Return a newly allocated string formed from the characters\n" |
| 1230 | "of @var{str} beginning with index @var{start} (inclusive) and\n" |
| 1231 | "ending with index @var{end} (exclusive).\n" |
| 1232 | "@var{str} must be a string, @var{start} and @var{end} must be\n" |
| 1233 | "exact integers satisfying:\n\n" |
| 1234 | "0 <= @var{start} <= @var{end} <= (string-length @var{str}).") |
| 1235 | #define FUNC_NAME s_scm_substring |
| 1236 | { |
| 1237 | size_t len, from, to; |
| 1238 | |
| 1239 | SCM_VALIDATE_STRING (1, str); |
| 1240 | len = scm_i_string_length (str); |
| 1241 | from = scm_to_unsigned_integer (start, 0, len); |
| 1242 | if (SCM_UNBNDP (end)) |
| 1243 | to = len; |
| 1244 | else |
| 1245 | to = scm_to_unsigned_integer (end, from, len); |
| 1246 | return scm_i_substring (str, from, to); |
| 1247 | } |
| 1248 | #undef FUNC_NAME |
| 1249 | |
| 1250 | SCM_DEFINE (scm_substring_read_only, "substring/read-only", 2, 1, 0, |
| 1251 | (SCM str, SCM start, SCM end), |
| 1252 | "Return a newly allocated string formed from the characters\n" |
| 1253 | "of @var{str} beginning with index @var{start} (inclusive) and\n" |
| 1254 | "ending with index @var{end} (exclusive).\n" |
| 1255 | "@var{str} must be a string, @var{start} and @var{end} must be\n" |
| 1256 | "exact integers satisfying:\n" |
| 1257 | "\n" |
| 1258 | "0 <= @var{start} <= @var{end} <= (string-length @var{str}).\n" |
| 1259 | "\n" |
| 1260 | "The returned string is read-only.\n") |
| 1261 | #define FUNC_NAME s_scm_substring_read_only |
| 1262 | { |
| 1263 | size_t len, from, to; |
| 1264 | |
| 1265 | SCM_VALIDATE_STRING (1, str); |
| 1266 | len = scm_i_string_length (str); |
| 1267 | from = scm_to_unsigned_integer (start, 0, len); |
| 1268 | if (SCM_UNBNDP (end)) |
| 1269 | to = len; |
| 1270 | else |
| 1271 | to = scm_to_unsigned_integer (end, from, len); |
| 1272 | return scm_i_substring_read_only (str, from, to); |
| 1273 | } |
| 1274 | #undef FUNC_NAME |
| 1275 | |
| 1276 | SCM_DEFINE (scm_substring_copy, "substring/copy", 2, 1, 0, |
| 1277 | (SCM str, SCM start, SCM end), |
| 1278 | "Return a newly allocated string formed from the characters\n" |
| 1279 | "of @var{str} beginning with index @var{start} (inclusive) and\n" |
| 1280 | "ending with index @var{end} (exclusive).\n" |
| 1281 | "@var{str} must be a string, @var{start} and @var{end} must be\n" |
| 1282 | "exact integers satisfying:\n\n" |
| 1283 | "0 <= @var{start} <= @var{end} <= (string-length @var{str}).") |
| 1284 | #define FUNC_NAME s_scm_substring_copy |
| 1285 | { |
| 1286 | /* For the Scheme version, START is mandatory, but for the C |
| 1287 | version, it is optional. See scm_string_copy in srfi-13.c for a |
| 1288 | rationale. |
| 1289 | */ |
| 1290 | |
| 1291 | size_t from, to; |
| 1292 | |
| 1293 | SCM_VALIDATE_STRING (1, str); |
| 1294 | scm_i_get_substring_spec (scm_i_string_length (str), |
| 1295 | start, &from, end, &to); |
| 1296 | return scm_i_substring_copy (str, from, to); |
| 1297 | } |
| 1298 | #undef FUNC_NAME |
| 1299 | |
| 1300 | SCM_DEFINE (scm_substring_shared, "substring/shared", 2, 1, 0, |
| 1301 | (SCM str, SCM start, SCM end), |
| 1302 | "Return string that indirectly refers to the characters\n" |
| 1303 | "of @var{str} beginning with index @var{start} (inclusive) and\n" |
| 1304 | "ending with index @var{end} (exclusive).\n" |
| 1305 | "@var{str} must be a string, @var{start} and @var{end} must be\n" |
| 1306 | "exact integers satisfying:\n\n" |
| 1307 | "0 <= @var{start} <= @var{end} <= (string-length @var{str}).") |
| 1308 | #define FUNC_NAME s_scm_substring_shared |
| 1309 | { |
| 1310 | size_t len, from, to; |
| 1311 | |
| 1312 | SCM_VALIDATE_STRING (1, str); |
| 1313 | len = scm_i_string_length (str); |
| 1314 | from = scm_to_unsigned_integer (start, 0, len); |
| 1315 | if (SCM_UNBNDP (end)) |
| 1316 | to = len; |
| 1317 | else |
| 1318 | to = scm_to_unsigned_integer (end, from, len); |
| 1319 | return scm_i_substring_shared (str, from, to); |
| 1320 | } |
| 1321 | #undef FUNC_NAME |
| 1322 | |
| 1323 | SCM_DEFINE (scm_string_append, "string-append", 0, 0, 1, |
| 1324 | (SCM args), |
| 1325 | "Return a newly allocated string whose characters form the\n" |
| 1326 | "concatenation of the given strings, @var{args}.") |
| 1327 | #define FUNC_NAME s_scm_string_append |
| 1328 | { |
| 1329 | SCM res; |
| 1330 | size_t len = 0; |
| 1331 | int wide = 0; |
| 1332 | SCM l, s; |
| 1333 | size_t i; |
| 1334 | union |
| 1335 | { |
| 1336 | char *narrow; |
| 1337 | scm_t_wchar *wide; |
| 1338 | } data; |
| 1339 | |
| 1340 | SCM_VALIDATE_REST_ARGUMENT (args); |
| 1341 | for (l = args; !scm_is_null (l); l = SCM_CDR (l)) |
| 1342 | { |
| 1343 | s = SCM_CAR (l); |
| 1344 | SCM_VALIDATE_STRING (SCM_ARGn, s); |
| 1345 | len += scm_i_string_length (s); |
| 1346 | if (!scm_i_is_narrow_string (s)) |
| 1347 | wide = 1; |
| 1348 | } |
| 1349 | data.narrow = NULL; |
| 1350 | if (!wide) |
| 1351 | res = scm_i_make_string (len, &data.narrow); |
| 1352 | else |
| 1353 | res = scm_i_make_wide_string (len, &data.wide); |
| 1354 | |
| 1355 | for (l = args; !scm_is_null (l); l = SCM_CDR (l)) |
| 1356 | { |
| 1357 | size_t len; |
| 1358 | s = SCM_CAR (l); |
| 1359 | SCM_VALIDATE_STRING (SCM_ARGn, s); |
| 1360 | len = scm_i_string_length (s); |
| 1361 | if (!wide) |
| 1362 | { |
| 1363 | memcpy (data.narrow, scm_i_string_chars (s), len); |
| 1364 | data.narrow += len; |
| 1365 | } |
| 1366 | else |
| 1367 | { |
| 1368 | if (scm_i_is_narrow_string (s)) |
| 1369 | { |
| 1370 | for (i = 0; i < scm_i_string_length (s); i++) |
| 1371 | data.wide[i] = (unsigned char) scm_i_string_chars (s)[i]; |
| 1372 | } |
| 1373 | else |
| 1374 | u32_cpy ((scm_t_uint32 *) data.wide, |
| 1375 | (scm_t_uint32 *) scm_i_string_wide_chars (s), len); |
| 1376 | data.wide += len; |
| 1377 | } |
| 1378 | scm_remember_upto_here_1 (s); |
| 1379 | } |
| 1380 | return res; |
| 1381 | } |
| 1382 | #undef FUNC_NAME |
| 1383 | |
| 1384 | int |
| 1385 | scm_is_string (SCM obj) |
| 1386 | { |
| 1387 | return IS_STRING (obj); |
| 1388 | } |
| 1389 | |
| 1390 | \f |
| 1391 | /* Conversion to/from other encodings. */ |
| 1392 | |
| 1393 | SCM_SYMBOL (scm_encoding_error_key, "encoding-error"); |
| 1394 | static void |
| 1395 | scm_encoding_error (const char *subr, const char *message, SCM args) |
| 1396 | { |
| 1397 | scm_error (scm_encoding_error_key, subr, message, args, SCM_BOOL_F); |
| 1398 | } |
| 1399 | |
| 1400 | SCM |
| 1401 | scm_from_stringn (const char *str, size_t len, const char *encoding, |
| 1402 | scm_t_string_failed_conversion_handler handler) |
| 1403 | { |
| 1404 | size_t u32len, i; |
| 1405 | scm_t_wchar *u32; |
| 1406 | int wide = 0; |
| 1407 | SCM res; |
| 1408 | |
| 1409 | if (len == 0) |
| 1410 | return scm_nullstr; |
| 1411 | |
| 1412 | if (encoding == NULL) |
| 1413 | { |
| 1414 | /* If encoding is null, use Latin-1. */ |
| 1415 | char *buf; |
| 1416 | res = scm_i_make_string (len, &buf); |
| 1417 | memcpy (buf, str, len); |
| 1418 | return res; |
| 1419 | } |
| 1420 | |
| 1421 | u32len = 0; |
| 1422 | u32 = (scm_t_wchar *) u32_conv_from_encoding (encoding, |
| 1423 | (enum iconv_ilseq_handler) |
| 1424 | handler, |
| 1425 | str, len, |
| 1426 | NULL, |
| 1427 | NULL, &u32len); |
| 1428 | |
| 1429 | if (u32 == NULL) |
| 1430 | { |
| 1431 | if (errno == ENOMEM) |
| 1432 | scm_memory_error ("locale string conversion"); |
| 1433 | else |
| 1434 | { |
| 1435 | /* There are invalid sequences in the input string. */ |
| 1436 | SCM errstr; |
| 1437 | char *dst; |
| 1438 | errstr = scm_i_make_string (len, &dst); |
| 1439 | memcpy (dst, str, len); |
| 1440 | scm_encoding_error (NULL, |
| 1441 | "input locale conversion error from ~s: ~s", |
| 1442 | scm_list_2 (scm_from_locale_string (encoding), |
| 1443 | errstr)); |
| 1444 | scm_remember_upto_here_1 (errstr); |
| 1445 | } |
| 1446 | } |
| 1447 | |
| 1448 | i = 0; |
| 1449 | while (i < u32len) |
| 1450 | if (u32[i++] > 0xFF) |
| 1451 | { |
| 1452 | wide = 1; |
| 1453 | break; |
| 1454 | } |
| 1455 | |
| 1456 | if (!wide) |
| 1457 | { |
| 1458 | char *dst; |
| 1459 | res = scm_i_make_string (u32len, &dst); |
| 1460 | for (i = 0; i < u32len; i ++) |
| 1461 | dst[i] = (unsigned char) u32[i]; |
| 1462 | dst[u32len] = '\0'; |
| 1463 | } |
| 1464 | else |
| 1465 | { |
| 1466 | scm_t_wchar *wdst; |
| 1467 | res = scm_i_make_wide_string (u32len, &wdst); |
| 1468 | u32_cpy ((scm_t_uint32 *) wdst, (scm_t_uint32 *) u32, u32len); |
| 1469 | wdst[u32len] = 0; |
| 1470 | } |
| 1471 | |
| 1472 | free (u32); |
| 1473 | return res; |
| 1474 | } |
| 1475 | |
| 1476 | SCM |
| 1477 | scm_from_locale_stringn (const char *str, size_t len) |
| 1478 | { |
| 1479 | const char *enc; |
| 1480 | scm_t_string_failed_conversion_handler hndl; |
| 1481 | SCM inport; |
| 1482 | scm_t_port *pt; |
| 1483 | |
| 1484 | if (len == (size_t) -1) |
| 1485 | len = strlen (str); |
| 1486 | if (len == 0) |
| 1487 | return scm_nullstr; |
| 1488 | |
| 1489 | inport = scm_current_input_port (); |
| 1490 | if (!SCM_UNBNDP (inport) && SCM_OPINPORTP (inport)) |
| 1491 | { |
| 1492 | pt = SCM_PTAB_ENTRY (inport); |
| 1493 | enc = pt->encoding; |
| 1494 | hndl = pt->ilseq_handler; |
| 1495 | } |
| 1496 | else |
| 1497 | { |
| 1498 | enc = NULL; |
| 1499 | hndl = SCM_FAILED_CONVERSION_ERROR; |
| 1500 | } |
| 1501 | |
| 1502 | return scm_from_stringn (str, len, enc, hndl); |
| 1503 | } |
| 1504 | |
| 1505 | SCM |
| 1506 | scm_from_locale_string (const char *str) |
| 1507 | { |
| 1508 | if (str == NULL) |
| 1509 | return scm_nullstr; |
| 1510 | |
| 1511 | return scm_from_locale_stringn (str, -1); |
| 1512 | } |
| 1513 | |
| 1514 | SCM |
| 1515 | scm_i_from_utf8_string (const scm_t_uint8 *str) |
| 1516 | { |
| 1517 | return scm_from_stringn ((const char *) str, |
| 1518 | strlen ((char *) str), "UTF-8", |
| 1519 | SCM_FAILED_CONVERSION_ERROR); |
| 1520 | } |
| 1521 | |
| 1522 | /* Create a new scheme string from the C string STR. The memory of |
| 1523 | STR may be used directly as storage for the new string. */ |
| 1524 | /* FIXME: GC-wise, the only way to use the memory area pointed to by STR |
| 1525 | would be to register a finalizer to eventually free(3) STR, which isn't |
| 1526 | worth it. Should we just deprecate the `scm_take_' functions? */ |
| 1527 | SCM |
| 1528 | scm_take_locale_stringn (char *str, size_t len) |
| 1529 | { |
| 1530 | SCM res; |
| 1531 | |
| 1532 | res = scm_from_locale_stringn (str, len); |
| 1533 | free (str); |
| 1534 | |
| 1535 | return res; |
| 1536 | } |
| 1537 | |
| 1538 | SCM |
| 1539 | scm_take_locale_string (char *str) |
| 1540 | { |
| 1541 | return scm_take_locale_stringn (str, -1); |
| 1542 | } |
| 1543 | |
| 1544 | /* Change libunistring escapes (\uXXXX and \UXXXXXXXX) to \xXX \uXXXX |
| 1545 | and \UXXXXXX. */ |
| 1546 | static void |
| 1547 | unistring_escapes_to_guile_escapes (char **bufp, size_t *lenp) |
| 1548 | { |
| 1549 | char *before, *after; |
| 1550 | size_t i, j; |
| 1551 | |
| 1552 | before = *bufp; |
| 1553 | after = *bufp; |
| 1554 | i = 0; |
| 1555 | j = 0; |
| 1556 | while (i < *lenp) |
| 1557 | { |
| 1558 | if ((i <= *lenp - 6) |
| 1559 | && before[i] == '\\' |
| 1560 | && before[i + 1] == 'u' |
| 1561 | && before[i + 2] == '0' && before[i + 3] == '0') |
| 1562 | { |
| 1563 | /* Convert \u00NN to \xNN */ |
| 1564 | after[j] = '\\'; |
| 1565 | after[j + 1] = 'x'; |
| 1566 | after[j + 2] = tolower ((int) before[i + 4]); |
| 1567 | after[j + 3] = tolower ((int) before[i + 5]); |
| 1568 | i += 6; |
| 1569 | j += 4; |
| 1570 | } |
| 1571 | else if ((i <= *lenp - 10) |
| 1572 | && before[i] == '\\' |
| 1573 | && before[i + 1] == 'U' |
| 1574 | && before[i + 2] == '0' && before[i + 3] == '0') |
| 1575 | { |
| 1576 | /* Convert \U00NNNNNN to \UNNNNNN */ |
| 1577 | after[j] = '\\'; |
| 1578 | after[j + 1] = 'U'; |
| 1579 | after[j + 2] = tolower ((int) before[i + 4]); |
| 1580 | after[j + 3] = tolower ((int) before[i + 5]); |
| 1581 | after[j + 4] = tolower ((int) before[i + 6]); |
| 1582 | after[j + 5] = tolower ((int) before[i + 7]); |
| 1583 | after[j + 6] = tolower ((int) before[i + 8]); |
| 1584 | after[j + 7] = tolower ((int) before[i + 9]); |
| 1585 | i += 10; |
| 1586 | j += 8; |
| 1587 | } |
| 1588 | else |
| 1589 | { |
| 1590 | after[j] = before[i]; |
| 1591 | i++; |
| 1592 | j++; |
| 1593 | } |
| 1594 | } |
| 1595 | *lenp = j; |
| 1596 | after = scm_realloc (after, j); |
| 1597 | } |
| 1598 | |
| 1599 | char * |
| 1600 | scm_to_locale_stringn (SCM str, size_t *lenp) |
| 1601 | { |
| 1602 | SCM outport; |
| 1603 | scm_t_port *pt; |
| 1604 | const char *enc; |
| 1605 | |
| 1606 | outport = scm_current_output_port (); |
| 1607 | if (!SCM_UNBNDP (outport) && SCM_OPOUTPORTP (outport)) |
| 1608 | { |
| 1609 | pt = SCM_PTAB_ENTRY (outport); |
| 1610 | enc = pt->encoding; |
| 1611 | } |
| 1612 | else |
| 1613 | enc = NULL; |
| 1614 | |
| 1615 | return scm_to_stringn (str, lenp, |
| 1616 | enc, |
| 1617 | scm_i_get_conversion_strategy (SCM_BOOL_F)); |
| 1618 | } |
| 1619 | |
| 1620 | /* Return a malloc(3)-allocated buffer containing the contents of STR encoded |
| 1621 | according to ENCODING. If LENP is non-NULL, set it to the size in bytes of |
| 1622 | the returned buffer. If the conversion to ENCODING fails, apply the strategy |
| 1623 | defined by HANDLER. */ |
| 1624 | char * |
| 1625 | scm_to_stringn (SCM str, size_t *lenp, const char *encoding, |
| 1626 | scm_t_string_failed_conversion_handler handler) |
| 1627 | { |
| 1628 | char *buf; |
| 1629 | size_t ilen, len, i; |
| 1630 | int ret; |
| 1631 | const char *enc; |
| 1632 | |
| 1633 | if (!scm_is_string (str)) |
| 1634 | scm_wrong_type_arg_msg (NULL, 0, str, "string"); |
| 1635 | ilen = scm_i_string_length (str); |
| 1636 | |
| 1637 | if (ilen == 0) |
| 1638 | { |
| 1639 | buf = scm_malloc (1); |
| 1640 | buf[0] = '\0'; |
| 1641 | if (lenp) |
| 1642 | *lenp = 0; |
| 1643 | return buf; |
| 1644 | } |
| 1645 | |
| 1646 | if (lenp == NULL) |
| 1647 | for (i = 0; i < ilen; i++) |
| 1648 | if (scm_i_string_ref (str, i) == '\0') |
| 1649 | scm_misc_error (NULL, |
| 1650 | "string contains #\\nul character: ~S", |
| 1651 | scm_list_1 (str)); |
| 1652 | |
| 1653 | if (scm_i_is_narrow_string (str) && (encoding == NULL)) |
| 1654 | { |
| 1655 | /* If using native Latin-1 encoding, just copy the string |
| 1656 | contents. */ |
| 1657 | if (lenp) |
| 1658 | { |
| 1659 | buf = scm_malloc (ilen); |
| 1660 | memcpy (buf, scm_i_string_chars (str), ilen); |
| 1661 | *lenp = ilen; |
| 1662 | return buf; |
| 1663 | } |
| 1664 | else |
| 1665 | { |
| 1666 | buf = scm_malloc (ilen + 1); |
| 1667 | memcpy (buf, scm_i_string_chars (str), ilen); |
| 1668 | buf[ilen] = '\0'; |
| 1669 | return buf; |
| 1670 | } |
| 1671 | } |
| 1672 | |
| 1673 | |
| 1674 | buf = NULL; |
| 1675 | len = 0; |
| 1676 | enc = encoding; |
| 1677 | if (enc == NULL) |
| 1678 | enc = "ISO-8859-1"; |
| 1679 | if (scm_i_is_narrow_string (str)) |
| 1680 | { |
| 1681 | ret = mem_iconveh (scm_i_string_chars (str), ilen, |
| 1682 | "ISO-8859-1", enc, |
| 1683 | (enum iconv_ilseq_handler) handler, NULL, |
| 1684 | &buf, &len); |
| 1685 | |
| 1686 | if (ret == 0 && handler == SCM_FAILED_CONVERSION_ESCAPE_SEQUENCE) |
| 1687 | unistring_escapes_to_guile_escapes (&buf, &len); |
| 1688 | |
| 1689 | if (ret != 0) |
| 1690 | scm_encoding_error (NULL, "cannot convert to output locale ~s: \"~s\"", |
| 1691 | scm_list_2 (scm_from_locale_string (enc), str)); |
| 1692 | } |
| 1693 | else |
| 1694 | { |
| 1695 | buf = u32_conv_to_encoding (enc, |
| 1696 | (enum iconv_ilseq_handler) handler, |
| 1697 | (scm_t_uint32 *) scm_i_string_wide_chars (str), |
| 1698 | ilen, |
| 1699 | NULL, |
| 1700 | NULL, &len); |
| 1701 | if (buf == NULL) |
| 1702 | scm_encoding_error (NULL, "cannot convert to output locale ~s: \"~s\"", |
| 1703 | scm_list_2 (scm_from_locale_string (enc), str)); |
| 1704 | |
| 1705 | if (handler == SCM_FAILED_CONVERSION_ESCAPE_SEQUENCE) |
| 1706 | unistring_escapes_to_guile_escapes (&buf, &len); |
| 1707 | } |
| 1708 | if (lenp) |
| 1709 | *lenp = len; |
| 1710 | else |
| 1711 | { |
| 1712 | buf = scm_realloc (buf, len + 1); |
| 1713 | buf[len] = '\0'; |
| 1714 | } |
| 1715 | |
| 1716 | scm_remember_upto_here_1 (str); |
| 1717 | return buf; |
| 1718 | } |
| 1719 | |
| 1720 | char * |
| 1721 | scm_to_locale_string (SCM str) |
| 1722 | { |
| 1723 | return scm_to_locale_stringn (str, NULL); |
| 1724 | } |
| 1725 | |
| 1726 | scm_t_uint8 * |
| 1727 | scm_i_to_utf8_string (SCM str) |
| 1728 | { |
| 1729 | char *u8str; |
| 1730 | u8str = scm_to_stringn (str, NULL, "UTF-8", SCM_FAILED_CONVERSION_ERROR); |
| 1731 | return (scm_t_uint8 *) u8str; |
| 1732 | } |
| 1733 | |
| 1734 | size_t |
| 1735 | scm_to_locale_stringbuf (SCM str, char *buf, size_t max_len) |
| 1736 | { |
| 1737 | size_t len; |
| 1738 | char *result = NULL; |
| 1739 | if (!scm_is_string (str)) |
| 1740 | scm_wrong_type_arg_msg (NULL, 0, str, "string"); |
| 1741 | result = scm_to_locale_stringn (str, &len); |
| 1742 | |
| 1743 | memcpy (buf, result, (len > max_len) ? max_len : len); |
| 1744 | free (result); |
| 1745 | |
| 1746 | scm_remember_upto_here_1 (str); |
| 1747 | return len; |
| 1748 | } |
| 1749 | |
| 1750 | \f |
| 1751 | /* Unicode string normalization. */ |
| 1752 | |
| 1753 | /* This function is a partial clone of SCM_STRING_TO_U32_BUF from |
| 1754 | libguile/i18n.c. It would be useful to have this factored out into a more |
| 1755 | convenient location, but its use of alloca makes that tricky to do. */ |
| 1756 | |
| 1757 | static SCM |
| 1758 | normalize_str (SCM string, uninorm_t form) |
| 1759 | { |
| 1760 | SCM ret; |
| 1761 | scm_t_uint32 *w_str; |
| 1762 | scm_t_wchar *cbuf; |
| 1763 | size_t rlen, len = scm_i_string_length (string); |
| 1764 | |
| 1765 | if (scm_i_is_narrow_string (string)) |
| 1766 | { |
| 1767 | size_t i; |
| 1768 | const char *buf = scm_i_string_chars (string); |
| 1769 | |
| 1770 | w_str = alloca (sizeof (scm_t_wchar) * (len + 1)); |
| 1771 | |
| 1772 | for (i = 0; i < len; i ++) |
| 1773 | w_str[i] = (unsigned char) buf[i]; |
| 1774 | w_str[len] = 0; |
| 1775 | } |
| 1776 | else |
| 1777 | w_str = (scm_t_uint32 *) scm_i_string_wide_chars (string); |
| 1778 | |
| 1779 | w_str = u32_normalize (form, w_str, len, NULL, &rlen); |
| 1780 | |
| 1781 | ret = scm_i_make_wide_string (rlen, &cbuf); |
| 1782 | u32_cpy ((scm_t_uint32 *) cbuf, w_str, rlen); |
| 1783 | free (w_str); |
| 1784 | |
| 1785 | scm_i_try_narrow_string (ret); |
| 1786 | |
| 1787 | return ret; |
| 1788 | } |
| 1789 | |
| 1790 | SCM_DEFINE (scm_string_normalize_nfc, "string-normalize-nfc", 1, 0, 0, |
| 1791 | (SCM string), |
| 1792 | "Returns the NFC normalized form of @var{string}.") |
| 1793 | #define FUNC_NAME s_scm_string_normalize_nfc |
| 1794 | { |
| 1795 | SCM_VALIDATE_STRING (1, string); |
| 1796 | return normalize_str (string, UNINORM_NFC); |
| 1797 | } |
| 1798 | #undef FUNC_NAME |
| 1799 | |
| 1800 | SCM_DEFINE (scm_string_normalize_nfd, "string-normalize-nfd", 1, 0, 0, |
| 1801 | (SCM string), |
| 1802 | "Returns the NFD normalized form of @var{string}.") |
| 1803 | #define FUNC_NAME s_scm_string_normalize_nfd |
| 1804 | { |
| 1805 | SCM_VALIDATE_STRING (1, string); |
| 1806 | return normalize_str (string, UNINORM_NFD); |
| 1807 | } |
| 1808 | #undef FUNC_NAME |
| 1809 | |
| 1810 | SCM_DEFINE (scm_string_normalize_nfkc, "string-normalize-nfkc", 1, 0, 0, |
| 1811 | (SCM string), |
| 1812 | "Returns the NFKC normalized form of @var{string}.") |
| 1813 | #define FUNC_NAME s_scm_string_normalize_nfkc |
| 1814 | { |
| 1815 | SCM_VALIDATE_STRING (1, string); |
| 1816 | return normalize_str (string, UNINORM_NFKC); |
| 1817 | } |
| 1818 | #undef FUNC_NAME |
| 1819 | |
| 1820 | SCM_DEFINE (scm_string_normalize_nfkd, "string-normalize-nfkd", 1, 0, 0, |
| 1821 | (SCM string), |
| 1822 | "Returns the NFKD normalized form of @var{string}.") |
| 1823 | #define FUNC_NAME s_scm_string_normalize_nfkd |
| 1824 | { |
| 1825 | SCM_VALIDATE_STRING (1, string); |
| 1826 | return normalize_str (string, UNINORM_NFKD); |
| 1827 | } |
| 1828 | #undef FUNC_NAME |
| 1829 | |
| 1830 | /* converts C scm_array of strings to SCM scm_list of strings. */ |
| 1831 | /* If argc < 0, a null terminated scm_array is assumed. */ |
| 1832 | SCM |
| 1833 | scm_makfromstrs (int argc, char **argv) |
| 1834 | { |
| 1835 | int i = argc; |
| 1836 | SCM lst = SCM_EOL; |
| 1837 | if (0 > i) |
| 1838 | for (i = 0; argv[i]; i++); |
| 1839 | while (i--) |
| 1840 | lst = scm_cons (scm_from_locale_string (argv[i]), lst); |
| 1841 | return lst; |
| 1842 | } |
| 1843 | |
| 1844 | /* Return a newly allocated array of char pointers to each of the strings |
| 1845 | in args, with a terminating NULL pointer. */ |
| 1846 | |
| 1847 | char ** |
| 1848 | scm_i_allocate_string_pointers (SCM list) |
| 1849 | #define FUNC_NAME "scm_i_allocate_string_pointers" |
| 1850 | { |
| 1851 | char **result; |
| 1852 | int len = scm_ilength (list); |
| 1853 | int i; |
| 1854 | |
| 1855 | if (len < 0) |
| 1856 | scm_wrong_type_arg_msg (NULL, 0, list, "proper list"); |
| 1857 | |
| 1858 | result = scm_gc_malloc ((len + 1) * sizeof (char *), |
| 1859 | "string pointers"); |
| 1860 | result[len] = NULL; |
| 1861 | |
| 1862 | /* The list might be have been modified in another thread, so |
| 1863 | we check LIST before each access. |
| 1864 | */ |
| 1865 | for (i = 0; i < len && scm_is_pair (list); i++) |
| 1866 | { |
| 1867 | SCM str; |
| 1868 | size_t len; |
| 1869 | |
| 1870 | str = SCM_CAR (list); |
| 1871 | len = scm_c_string_length (str); |
| 1872 | |
| 1873 | result[i] = scm_gc_malloc_pointerless (len + 1, "string pointers"); |
| 1874 | memcpy (result[i], scm_i_string_chars (str), len); |
| 1875 | result[i][len] = '\0'; |
| 1876 | |
| 1877 | list = SCM_CDR (list); |
| 1878 | } |
| 1879 | |
| 1880 | return result; |
| 1881 | } |
| 1882 | #undef FUNC_NAME |
| 1883 | |
| 1884 | void |
| 1885 | scm_i_get_substring_spec (size_t len, |
| 1886 | SCM start, size_t *cstart, |
| 1887 | SCM end, size_t *cend) |
| 1888 | { |
| 1889 | if (SCM_UNBNDP (start)) |
| 1890 | *cstart = 0; |
| 1891 | else |
| 1892 | *cstart = scm_to_unsigned_integer (start, 0, len); |
| 1893 | |
| 1894 | if (SCM_UNBNDP (end)) |
| 1895 | *cend = len; |
| 1896 | else |
| 1897 | *cend = scm_to_unsigned_integer (end, *cstart, len); |
| 1898 | } |
| 1899 | |
| 1900 | #if SCM_ENABLE_DEPRECATED |
| 1901 | |
| 1902 | /* When these definitions are removed, it becomes reasonable to use |
| 1903 | read-only strings for string literals. For that, change the reader |
| 1904 | to create string literals with scm_c_substring_read_only instead of |
| 1905 | with scm_c_substring_copy. |
| 1906 | */ |
| 1907 | |
| 1908 | int |
| 1909 | scm_i_deprecated_stringp (SCM str) |
| 1910 | { |
| 1911 | scm_c_issue_deprecation_warning |
| 1912 | ("SCM_STRINGP is deprecated. Use scm_is_string instead."); |
| 1913 | |
| 1914 | return scm_is_string (str); |
| 1915 | } |
| 1916 | |
| 1917 | char * |
| 1918 | scm_i_deprecated_string_chars (SCM str) |
| 1919 | { |
| 1920 | char *chars; |
| 1921 | |
| 1922 | scm_c_issue_deprecation_warning |
| 1923 | ("SCM_STRING_CHARS is deprecated. See the manual for alternatives."); |
| 1924 | |
| 1925 | /* We don't accept shared substrings here since they are not |
| 1926 | null-terminated. |
| 1927 | */ |
| 1928 | if (IS_SH_STRING (str)) |
| 1929 | scm_misc_error (NULL, |
| 1930 | "SCM_STRING_CHARS does not work with shared substrings", |
| 1931 | SCM_EOL); |
| 1932 | |
| 1933 | /* We explicitly test for read-only strings to produce a better |
| 1934 | error message. |
| 1935 | */ |
| 1936 | |
| 1937 | if (IS_RO_STRING (str)) |
| 1938 | scm_misc_error (NULL, |
| 1939 | "SCM_STRING_CHARS does not work with read-only strings", |
| 1940 | SCM_EOL); |
| 1941 | |
| 1942 | /* The following is still wrong, of course... |
| 1943 | */ |
| 1944 | str = scm_i_string_start_writing (str); |
| 1945 | chars = scm_i_string_writable_chars (str); |
| 1946 | scm_i_string_stop_writing (); |
| 1947 | return chars; |
| 1948 | } |
| 1949 | |
| 1950 | size_t |
| 1951 | scm_i_deprecated_string_length (SCM str) |
| 1952 | { |
| 1953 | scm_c_issue_deprecation_warning |
| 1954 | ("SCM_STRING_LENGTH is deprecated. Use scm_c_string_length instead."); |
| 1955 | return scm_c_string_length (str); |
| 1956 | } |
| 1957 | |
| 1958 | #endif |
| 1959 | |
| 1960 | static SCM |
| 1961 | string_handle_ref (scm_t_array_handle *h, size_t index) |
| 1962 | { |
| 1963 | return scm_c_string_ref (h->array, index); |
| 1964 | } |
| 1965 | |
| 1966 | static void |
| 1967 | string_handle_set (scm_t_array_handle *h, size_t index, SCM val) |
| 1968 | { |
| 1969 | scm_c_string_set_x (h->array, index, val); |
| 1970 | } |
| 1971 | |
| 1972 | static void |
| 1973 | string_get_handle (SCM v, scm_t_array_handle *h) |
| 1974 | { |
| 1975 | h->array = v; |
| 1976 | h->ndims = 1; |
| 1977 | h->dims = &h->dim0; |
| 1978 | h->dim0.lbnd = 0; |
| 1979 | h->dim0.ubnd = scm_c_string_length (v) - 1; |
| 1980 | h->dim0.inc = 1; |
| 1981 | h->element_type = SCM_ARRAY_ELEMENT_TYPE_CHAR; |
| 1982 | h->elements = h->writable_elements = NULL; |
| 1983 | } |
| 1984 | |
| 1985 | SCM_ARRAY_IMPLEMENTATION (scm_tc7_string, 0x7f, |
| 1986 | string_handle_ref, string_handle_set, |
| 1987 | string_get_handle) |
| 1988 | SCM_VECTOR_IMPLEMENTATION (SCM_ARRAY_ELEMENT_TYPE_CHAR, scm_make_string) |
| 1989 | |
| 1990 | void |
| 1991 | scm_init_strings () |
| 1992 | { |
| 1993 | scm_nullstr = scm_i_make_string (0, NULL); |
| 1994 | |
| 1995 | #include "libguile/strings.x" |
| 1996 | } |
| 1997 | |
| 1998 | |
| 1999 | /* |
| 2000 | Local Variables: |
| 2001 | c-file-style: "gnu" |
| 2002 | End: |
| 2003 | */ |