| 1 | /* Determine a canonical name for the current locale's character encoding. |
| 2 | |
| 3 | Copyright (C) 2000-2006, 2008-2012 Free Software Foundation, Inc. |
| 4 | |
| 5 | This program is free software; you can redistribute it and/or modify |
| 6 | it under the terms of the GNU Lesser General Public License as published by |
| 7 | the Free Software Foundation; either version 2, or (at your option) |
| 8 | any later version. |
| 9 | |
| 10 | This program is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | GNU Lesser General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU Lesser General Public License along |
| 16 | with this program; if not, see <http://www.gnu.org/licenses/>. */ |
| 17 | |
| 18 | /* Written by Bruno Haible <bruno@clisp.org>. */ |
| 19 | |
| 20 | #include <config.h> |
| 21 | |
| 22 | /* Specification. */ |
| 23 | #include "localcharset.h" |
| 24 | |
| 25 | #include <fcntl.h> |
| 26 | #include <stddef.h> |
| 27 | #include <stdio.h> |
| 28 | #include <string.h> |
| 29 | #include <stdlib.h> |
| 30 | |
| 31 | #if defined __APPLE__ && defined __MACH__ && HAVE_LANGINFO_CODESET |
| 32 | # define DARWIN7 /* Darwin 7 or newer, i.e. Mac OS X 10.3 or newer */ |
| 33 | #endif |
| 34 | |
| 35 | #if defined _WIN32 || defined __WIN32__ |
| 36 | # define WINDOWS_NATIVE |
| 37 | #endif |
| 38 | |
| 39 | #if defined __EMX__ |
| 40 | /* Assume EMX program runs on OS/2, even if compiled under DOS. */ |
| 41 | # ifndef OS2 |
| 42 | # define OS2 |
| 43 | # endif |
| 44 | #endif |
| 45 | |
| 46 | #if !defined WINDOWS_NATIVE |
| 47 | # include <unistd.h> |
| 48 | # if HAVE_LANGINFO_CODESET |
| 49 | # include <langinfo.h> |
| 50 | # else |
| 51 | # if 0 /* see comment below */ |
| 52 | # include <locale.h> |
| 53 | # endif |
| 54 | # endif |
| 55 | # ifdef __CYGWIN__ |
| 56 | # define WIN32_LEAN_AND_MEAN |
| 57 | # include <windows.h> |
| 58 | # endif |
| 59 | #elif defined WINDOWS_NATIVE |
| 60 | # define WIN32_LEAN_AND_MEAN |
| 61 | # include <windows.h> |
| 62 | #endif |
| 63 | #if defined OS2 |
| 64 | # define INCL_DOS |
| 65 | # include <os2.h> |
| 66 | #endif |
| 67 | |
| 68 | #if ENABLE_RELOCATABLE |
| 69 | # include "relocatable.h" |
| 70 | #else |
| 71 | # define relocate(pathname) (pathname) |
| 72 | #endif |
| 73 | |
| 74 | /* Get LIBDIR. */ |
| 75 | #ifndef LIBDIR |
| 76 | # include "configmake.h" |
| 77 | #endif |
| 78 | |
| 79 | /* Define O_NOFOLLOW to 0 on platforms where it does not exist. */ |
| 80 | #ifndef O_NOFOLLOW |
| 81 | # define O_NOFOLLOW 0 |
| 82 | #endif |
| 83 | |
| 84 | #if defined _WIN32 || defined __WIN32__ || defined __CYGWIN__ || defined __EMX__ || defined __DJGPP__ |
| 85 | /* Native Windows, Cygwin, OS/2, DOS */ |
| 86 | # define ISSLASH(C) ((C) == '/' || (C) == '\\') |
| 87 | #endif |
| 88 | |
| 89 | #ifndef DIRECTORY_SEPARATOR |
| 90 | # define DIRECTORY_SEPARATOR '/' |
| 91 | #endif |
| 92 | |
| 93 | #ifndef ISSLASH |
| 94 | # define ISSLASH(C) ((C) == DIRECTORY_SEPARATOR) |
| 95 | #endif |
| 96 | |
| 97 | #if HAVE_DECL_GETC_UNLOCKED |
| 98 | # undef getc |
| 99 | # define getc getc_unlocked |
| 100 | #endif |
| 101 | |
| 102 | /* The following static variable is declared 'volatile' to avoid a |
| 103 | possible multithread problem in the function get_charset_aliases. If we |
| 104 | are running in a threaded environment, and if two threads initialize |
| 105 | 'charset_aliases' simultaneously, both will produce the same value, |
| 106 | and everything will be ok if the two assignments to 'charset_aliases' |
| 107 | are atomic. But I don't know what will happen if the two assignments mix. */ |
| 108 | #if __STDC__ != 1 |
| 109 | # define volatile /* empty */ |
| 110 | #endif |
| 111 | /* Pointer to the contents of the charset.alias file, if it has already been |
| 112 | read, else NULL. Its format is: |
| 113 | ALIAS_1 '\0' CANONICAL_1 '\0' ... ALIAS_n '\0' CANONICAL_n '\0' '\0' */ |
| 114 | static const char * volatile charset_aliases; |
| 115 | |
| 116 | /* Return a pointer to the contents of the charset.alias file. */ |
| 117 | static const char * |
| 118 | get_charset_aliases (void) |
| 119 | { |
| 120 | const char *cp; |
| 121 | |
| 122 | cp = charset_aliases; |
| 123 | if (cp == NULL) |
| 124 | { |
| 125 | #if !(defined DARWIN7 || defined VMS || defined WINDOWS_NATIVE || defined __CYGWIN__) |
| 126 | const char *dir; |
| 127 | const char *base = "charset.alias"; |
| 128 | char *file_name; |
| 129 | |
| 130 | /* Make it possible to override the charset.alias location. This is |
| 131 | necessary for running the testsuite before "make install". */ |
| 132 | dir = getenv ("CHARSETALIASDIR"); |
| 133 | if (dir == NULL || dir[0] == '\0') |
| 134 | dir = relocate (LIBDIR); |
| 135 | |
| 136 | /* Concatenate dir and base into freshly allocated file_name. */ |
| 137 | { |
| 138 | size_t dir_len = strlen (dir); |
| 139 | size_t base_len = strlen (base); |
| 140 | int add_slash = (dir_len > 0 && !ISSLASH (dir[dir_len - 1])); |
| 141 | file_name = (char *) malloc (dir_len + add_slash + base_len + 1); |
| 142 | if (file_name != NULL) |
| 143 | { |
| 144 | memcpy (file_name, dir, dir_len); |
| 145 | if (add_slash) |
| 146 | file_name[dir_len] = DIRECTORY_SEPARATOR; |
| 147 | memcpy (file_name + dir_len + add_slash, base, base_len + 1); |
| 148 | } |
| 149 | } |
| 150 | |
| 151 | if (file_name == NULL) |
| 152 | /* Out of memory. Treat the file as empty. */ |
| 153 | cp = ""; |
| 154 | else |
| 155 | { |
| 156 | int fd; |
| 157 | |
| 158 | /* Open the file. Reject symbolic links on platforms that support |
| 159 | O_NOFOLLOW. This is a security feature. Without it, an attacker |
| 160 | could retrieve parts of the contents (namely, the tail of the |
| 161 | first line that starts with "* ") of an arbitrary file by placing |
| 162 | a symbolic link to that file under the name "charset.alias" in |
| 163 | some writable directory and defining the environment variable |
| 164 | CHARSETALIASDIR to point to that directory. */ |
| 165 | fd = open (file_name, |
| 166 | O_RDONLY | (HAVE_WORKING_O_NOFOLLOW ? O_NOFOLLOW : 0)); |
| 167 | if (fd < 0) |
| 168 | /* File not found. Treat it as empty. */ |
| 169 | cp = ""; |
| 170 | else |
| 171 | { |
| 172 | FILE *fp; |
| 173 | |
| 174 | fp = fdopen (fd, "r"); |
| 175 | if (fp == NULL) |
| 176 | { |
| 177 | /* Out of memory. Treat the file as empty. */ |
| 178 | close (fd); |
| 179 | cp = ""; |
| 180 | } |
| 181 | else |
| 182 | { |
| 183 | /* Parse the file's contents. */ |
| 184 | char *res_ptr = NULL; |
| 185 | size_t res_size = 0; |
| 186 | |
| 187 | for (;;) |
| 188 | { |
| 189 | int c; |
| 190 | char buf1[50+1]; |
| 191 | char buf2[50+1]; |
| 192 | size_t l1, l2; |
| 193 | char *old_res_ptr; |
| 194 | |
| 195 | c = getc (fp); |
| 196 | if (c == EOF) |
| 197 | break; |
| 198 | if (c == '\n' || c == ' ' || c == '\t') |
| 199 | continue; |
| 200 | if (c == '#') |
| 201 | { |
| 202 | /* Skip comment, to end of line. */ |
| 203 | do |
| 204 | c = getc (fp); |
| 205 | while (!(c == EOF || c == '\n')); |
| 206 | if (c == EOF) |
| 207 | break; |
| 208 | continue; |
| 209 | } |
| 210 | ungetc (c, fp); |
| 211 | if (fscanf (fp, "%50s %50s", buf1, buf2) < 2) |
| 212 | break; |
| 213 | l1 = strlen (buf1); |
| 214 | l2 = strlen (buf2); |
| 215 | old_res_ptr = res_ptr; |
| 216 | if (res_size == 0) |
| 217 | { |
| 218 | res_size = l1 + 1 + l2 + 1; |
| 219 | res_ptr = (char *) malloc (res_size + 1); |
| 220 | } |
| 221 | else |
| 222 | { |
| 223 | res_size += l1 + 1 + l2 + 1; |
| 224 | res_ptr = (char *) realloc (res_ptr, res_size + 1); |
| 225 | } |
| 226 | if (res_ptr == NULL) |
| 227 | { |
| 228 | /* Out of memory. */ |
| 229 | res_size = 0; |
| 230 | free (old_res_ptr); |
| 231 | break; |
| 232 | } |
| 233 | strcpy (res_ptr + res_size - (l2 + 1) - (l1 + 1), buf1); |
| 234 | strcpy (res_ptr + res_size - (l2 + 1), buf2); |
| 235 | } |
| 236 | fclose (fp); |
| 237 | if (res_size == 0) |
| 238 | cp = ""; |
| 239 | else |
| 240 | { |
| 241 | *(res_ptr + res_size) = '\0'; |
| 242 | cp = res_ptr; |
| 243 | } |
| 244 | } |
| 245 | } |
| 246 | |
| 247 | free (file_name); |
| 248 | } |
| 249 | |
| 250 | #else |
| 251 | |
| 252 | # if defined DARWIN7 |
| 253 | /* To avoid the trouble of installing a file that is shared by many |
| 254 | GNU packages -- many packaging systems have problems with this --, |
| 255 | simply inline the aliases here. */ |
| 256 | cp = "ISO8859-1" "\0" "ISO-8859-1" "\0" |
| 257 | "ISO8859-2" "\0" "ISO-8859-2" "\0" |
| 258 | "ISO8859-4" "\0" "ISO-8859-4" "\0" |
| 259 | "ISO8859-5" "\0" "ISO-8859-5" "\0" |
| 260 | "ISO8859-7" "\0" "ISO-8859-7" "\0" |
| 261 | "ISO8859-9" "\0" "ISO-8859-9" "\0" |
| 262 | "ISO8859-13" "\0" "ISO-8859-13" "\0" |
| 263 | "ISO8859-15" "\0" "ISO-8859-15" "\0" |
| 264 | "KOI8-R" "\0" "KOI8-R" "\0" |
| 265 | "KOI8-U" "\0" "KOI8-U" "\0" |
| 266 | "CP866" "\0" "CP866" "\0" |
| 267 | "CP949" "\0" "CP949" "\0" |
| 268 | "CP1131" "\0" "CP1131" "\0" |
| 269 | "CP1251" "\0" "CP1251" "\0" |
| 270 | "eucCN" "\0" "GB2312" "\0" |
| 271 | "GB2312" "\0" "GB2312" "\0" |
| 272 | "eucJP" "\0" "EUC-JP" "\0" |
| 273 | "eucKR" "\0" "EUC-KR" "\0" |
| 274 | "Big5" "\0" "BIG5" "\0" |
| 275 | "Big5HKSCS" "\0" "BIG5-HKSCS" "\0" |
| 276 | "GBK" "\0" "GBK" "\0" |
| 277 | "GB18030" "\0" "GB18030" "\0" |
| 278 | "SJIS" "\0" "SHIFT_JIS" "\0" |
| 279 | "ARMSCII-8" "\0" "ARMSCII-8" "\0" |
| 280 | "PT154" "\0" "PT154" "\0" |
| 281 | /*"ISCII-DEV" "\0" "?" "\0"*/ |
| 282 | "*" "\0" "UTF-8" "\0"; |
| 283 | # endif |
| 284 | |
| 285 | # if defined VMS |
| 286 | /* To avoid the troubles of an extra file charset.alias_vms in the |
| 287 | sources of many GNU packages, simply inline the aliases here. */ |
| 288 | /* The list of encodings is taken from the OpenVMS 7.3-1 documentation |
| 289 | "Compaq C Run-Time Library Reference Manual for OpenVMS systems" |
| 290 | section 10.7 "Handling Different Character Sets". */ |
| 291 | cp = "ISO8859-1" "\0" "ISO-8859-1" "\0" |
| 292 | "ISO8859-2" "\0" "ISO-8859-2" "\0" |
| 293 | "ISO8859-5" "\0" "ISO-8859-5" "\0" |
| 294 | "ISO8859-7" "\0" "ISO-8859-7" "\0" |
| 295 | "ISO8859-8" "\0" "ISO-8859-8" "\0" |
| 296 | "ISO8859-9" "\0" "ISO-8859-9" "\0" |
| 297 | /* Japanese */ |
| 298 | "eucJP" "\0" "EUC-JP" "\0" |
| 299 | "SJIS" "\0" "SHIFT_JIS" "\0" |
| 300 | "DECKANJI" "\0" "DEC-KANJI" "\0" |
| 301 | "SDECKANJI" "\0" "EUC-JP" "\0" |
| 302 | /* Chinese */ |
| 303 | "eucTW" "\0" "EUC-TW" "\0" |
| 304 | "DECHANYU" "\0" "DEC-HANYU" "\0" |
| 305 | "DECHANZI" "\0" "GB2312" "\0" |
| 306 | /* Korean */ |
| 307 | "DECKOREAN" "\0" "EUC-KR" "\0"; |
| 308 | # endif |
| 309 | |
| 310 | # if defined WINDOWS_NATIVE || defined __CYGWIN__ |
| 311 | /* To avoid the troubles of installing a separate file in the same |
| 312 | directory as the DLL and of retrieving the DLL's directory at |
| 313 | runtime, simply inline the aliases here. */ |
| 314 | |
| 315 | cp = "CP936" "\0" "GBK" "\0" |
| 316 | "CP1361" "\0" "JOHAB" "\0" |
| 317 | "CP20127" "\0" "ASCII" "\0" |
| 318 | "CP20866" "\0" "KOI8-R" "\0" |
| 319 | "CP20936" "\0" "GB2312" "\0" |
| 320 | "CP21866" "\0" "KOI8-RU" "\0" |
| 321 | "CP28591" "\0" "ISO-8859-1" "\0" |
| 322 | "CP28592" "\0" "ISO-8859-2" "\0" |
| 323 | "CP28593" "\0" "ISO-8859-3" "\0" |
| 324 | "CP28594" "\0" "ISO-8859-4" "\0" |
| 325 | "CP28595" "\0" "ISO-8859-5" "\0" |
| 326 | "CP28596" "\0" "ISO-8859-6" "\0" |
| 327 | "CP28597" "\0" "ISO-8859-7" "\0" |
| 328 | "CP28598" "\0" "ISO-8859-8" "\0" |
| 329 | "CP28599" "\0" "ISO-8859-9" "\0" |
| 330 | "CP28605" "\0" "ISO-8859-15" "\0" |
| 331 | "CP38598" "\0" "ISO-8859-8" "\0" |
| 332 | "CP51932" "\0" "EUC-JP" "\0" |
| 333 | "CP51936" "\0" "GB2312" "\0" |
| 334 | "CP51949" "\0" "EUC-KR" "\0" |
| 335 | "CP51950" "\0" "EUC-TW" "\0" |
| 336 | "CP54936" "\0" "GB18030" "\0" |
| 337 | "CP65001" "\0" "UTF-8" "\0"; |
| 338 | # endif |
| 339 | #endif |
| 340 | |
| 341 | charset_aliases = cp; |
| 342 | } |
| 343 | |
| 344 | return cp; |
| 345 | } |
| 346 | |
| 347 | /* Determine the current locale's character encoding, and canonicalize it |
| 348 | into one of the canonical names listed in config.charset. |
| 349 | The result must not be freed; it is statically allocated. |
| 350 | If the canonical name cannot be determined, the result is a non-canonical |
| 351 | name. */ |
| 352 | |
| 353 | #ifdef STATIC |
| 354 | STATIC |
| 355 | #endif |
| 356 | const char * |
| 357 | locale_charset (void) |
| 358 | { |
| 359 | const char *codeset; |
| 360 | const char *aliases; |
| 361 | |
| 362 | #if !(defined WINDOWS_NATIVE || defined OS2) |
| 363 | |
| 364 | # if HAVE_LANGINFO_CODESET |
| 365 | |
| 366 | /* Most systems support nl_langinfo (CODESET) nowadays. */ |
| 367 | codeset = nl_langinfo (CODESET); |
| 368 | |
| 369 | # ifdef __CYGWIN__ |
| 370 | /* Cygwin < 1.7 does not have locales. nl_langinfo (CODESET) always |
| 371 | returns "US-ASCII". Return the suffix of the locale name from the |
| 372 | environment variables (if present) or the codepage as a number. */ |
| 373 | if (codeset != NULL && strcmp (codeset, "US-ASCII") == 0) |
| 374 | { |
| 375 | const char *locale; |
| 376 | static char buf[2 + 10 + 1]; |
| 377 | |
| 378 | locale = getenv ("LC_ALL"); |
| 379 | if (locale == NULL || locale[0] == '\0') |
| 380 | { |
| 381 | locale = getenv ("LC_CTYPE"); |
| 382 | if (locale == NULL || locale[0] == '\0') |
| 383 | locale = getenv ("LANG"); |
| 384 | } |
| 385 | if (locale != NULL && locale[0] != '\0') |
| 386 | { |
| 387 | /* If the locale name contains an encoding after the dot, return |
| 388 | it. */ |
| 389 | const char *dot = strchr (locale, '.'); |
| 390 | |
| 391 | if (dot != NULL) |
| 392 | { |
| 393 | const char *modifier; |
| 394 | |
| 395 | dot++; |
| 396 | /* Look for the possible @... trailer and remove it, if any. */ |
| 397 | modifier = strchr (dot, '@'); |
| 398 | if (modifier == NULL) |
| 399 | return dot; |
| 400 | if (modifier - dot < sizeof (buf)) |
| 401 | { |
| 402 | memcpy (buf, dot, modifier - dot); |
| 403 | buf [modifier - dot] = '\0'; |
| 404 | return buf; |
| 405 | } |
| 406 | } |
| 407 | } |
| 408 | |
| 409 | /* The Windows API has a function returning the locale's codepage as a |
| 410 | number: GetACP(). This encoding is used by Cygwin, unless the user |
| 411 | has set the environment variable CYGWIN=codepage:oem (which very few |
| 412 | people do). |
| 413 | Output directed to console windows needs to be converted (to |
| 414 | GetOEMCP() if the console is using a raster font, or to |
| 415 | GetConsoleOutputCP() if it is using a TrueType font). Cygwin does |
| 416 | this conversion transparently (see winsup/cygwin/fhandler_console.cc), |
| 417 | converting to GetConsoleOutputCP(). This leads to correct results, |
| 418 | except when SetConsoleOutputCP has been called and a raster font is |
| 419 | in use. */ |
| 420 | sprintf (buf, "CP%u", GetACP ()); |
| 421 | codeset = buf; |
| 422 | } |
| 423 | # endif |
| 424 | |
| 425 | # else |
| 426 | |
| 427 | /* On old systems which lack it, use setlocale or getenv. */ |
| 428 | const char *locale = NULL; |
| 429 | |
| 430 | /* But most old systems don't have a complete set of locales. Some |
| 431 | (like SunOS 4 or DJGPP) have only the C locale. Therefore we don't |
| 432 | use setlocale here; it would return "C" when it doesn't support the |
| 433 | locale name the user has set. */ |
| 434 | # if 0 |
| 435 | locale = setlocale (LC_CTYPE, NULL); |
| 436 | # endif |
| 437 | if (locale == NULL || locale[0] == '\0') |
| 438 | { |
| 439 | locale = getenv ("LC_ALL"); |
| 440 | if (locale == NULL || locale[0] == '\0') |
| 441 | { |
| 442 | locale = getenv ("LC_CTYPE"); |
| 443 | if (locale == NULL || locale[0] == '\0') |
| 444 | locale = getenv ("LANG"); |
| 445 | } |
| 446 | } |
| 447 | |
| 448 | /* On some old systems, one used to set locale = "iso8859_1". On others, |
| 449 | you set it to "language_COUNTRY.charset". In any case, we resolve it |
| 450 | through the charset.alias file. */ |
| 451 | codeset = locale; |
| 452 | |
| 453 | # endif |
| 454 | |
| 455 | #elif defined WINDOWS_NATIVE |
| 456 | |
| 457 | static char buf[2 + 10 + 1]; |
| 458 | |
| 459 | /* The Windows API has a function returning the locale's codepage as a |
| 460 | number: GetACP(). |
| 461 | When the output goes to a console window, it needs to be provided in |
| 462 | GetOEMCP() encoding if the console is using a raster font, or in |
| 463 | GetConsoleOutputCP() encoding if it is using a TrueType font. |
| 464 | But in GUI programs and for output sent to files and pipes, GetACP() |
| 465 | encoding is the best bet. */ |
| 466 | sprintf (buf, "CP%u", GetACP ()); |
| 467 | codeset = buf; |
| 468 | |
| 469 | #elif defined OS2 |
| 470 | |
| 471 | const char *locale; |
| 472 | static char buf[2 + 10 + 1]; |
| 473 | ULONG cp[3]; |
| 474 | ULONG cplen; |
| 475 | |
| 476 | /* Allow user to override the codeset, as set in the operating system, |
| 477 | with standard language environment variables. */ |
| 478 | locale = getenv ("LC_ALL"); |
| 479 | if (locale == NULL || locale[0] == '\0') |
| 480 | { |
| 481 | locale = getenv ("LC_CTYPE"); |
| 482 | if (locale == NULL || locale[0] == '\0') |
| 483 | locale = getenv ("LANG"); |
| 484 | } |
| 485 | if (locale != NULL && locale[0] != '\0') |
| 486 | { |
| 487 | /* If the locale name contains an encoding after the dot, return it. */ |
| 488 | const char *dot = strchr (locale, '.'); |
| 489 | |
| 490 | if (dot != NULL) |
| 491 | { |
| 492 | const char *modifier; |
| 493 | |
| 494 | dot++; |
| 495 | /* Look for the possible @... trailer and remove it, if any. */ |
| 496 | modifier = strchr (dot, '@'); |
| 497 | if (modifier == NULL) |
| 498 | return dot; |
| 499 | if (modifier - dot < sizeof (buf)) |
| 500 | { |
| 501 | memcpy (buf, dot, modifier - dot); |
| 502 | buf [modifier - dot] = '\0'; |
| 503 | return buf; |
| 504 | } |
| 505 | } |
| 506 | |
| 507 | /* Resolve through the charset.alias file. */ |
| 508 | codeset = locale; |
| 509 | } |
| 510 | else |
| 511 | { |
| 512 | /* OS/2 has a function returning the locale's codepage as a number. */ |
| 513 | if (DosQueryCp (sizeof (cp), cp, &cplen)) |
| 514 | codeset = ""; |
| 515 | else |
| 516 | { |
| 517 | sprintf (buf, "CP%u", cp[0]); |
| 518 | codeset = buf; |
| 519 | } |
| 520 | } |
| 521 | |
| 522 | #endif |
| 523 | |
| 524 | if (codeset == NULL) |
| 525 | /* The canonical name cannot be determined. */ |
| 526 | codeset = ""; |
| 527 | |
| 528 | /* Resolve alias. */ |
| 529 | for (aliases = get_charset_aliases (); |
| 530 | *aliases != '\0'; |
| 531 | aliases += strlen (aliases) + 1, aliases += strlen (aliases) + 1) |
| 532 | if (strcmp (codeset, aliases) == 0 |
| 533 | || (aliases[0] == '*' && aliases[1] == '\0')) |
| 534 | { |
| 535 | codeset = aliases + strlen (aliases) + 1; |
| 536 | break; |
| 537 | } |
| 538 | |
| 539 | /* Don't return an empty string. GNU libc and GNU libiconv interpret |
| 540 | the empty string as denoting "the locale's character encoding", |
| 541 | thus GNU libiconv would call this function a second time. */ |
| 542 | if (codeset[0] == '\0') |
| 543 | codeset = "ASCII"; |
| 544 | |
| 545 | return codeset; |
| 546 | } |
| 547 | |
| 548 | /* A variant of the above, without calls to `setlocale', `nl_langinfo', |
| 549 | etc. */ |
| 550 | const char * |
| 551 | environ_locale_charset (void) |
| 552 | { |
| 553 | static char buf[2 + 10 + 1]; |
| 554 | const char *codeset, *aliases; |
| 555 | const char *locale = NULL; |
| 556 | |
| 557 | locale = getenv ("LC_ALL"); |
| 558 | if (locale == NULL || locale[0] == '\0') |
| 559 | { |
| 560 | locale = getenv ("LC_CTYPE"); |
| 561 | if (locale == NULL || locale[0] == '\0') |
| 562 | locale = getenv ("LANG"); |
| 563 | } |
| 564 | |
| 565 | if (locale != NULL && locale[0] != '\0') |
| 566 | { |
| 567 | /* If the locale name contains an encoding after the dot, return it. */ |
| 568 | const char *dot = strchr (locale, '.'); |
| 569 | |
| 570 | if (dot != NULL) |
| 571 | { |
| 572 | const char *modifier; |
| 573 | |
| 574 | dot++; |
| 575 | /* Look for the possible @... trailer and remove it, if any. */ |
| 576 | modifier = strchr (dot, '@'); |
| 577 | if (modifier == NULL) |
| 578 | return dot; |
| 579 | if (modifier - dot < sizeof (buf)) |
| 580 | { |
| 581 | memcpy (buf, dot, modifier - dot); |
| 582 | buf [modifier - dot] = '\0'; |
| 583 | return buf; |
| 584 | } |
| 585 | } |
| 586 | else if (strcmp (locale, "C") == 0) |
| 587 | { |
| 588 | strcpy (buf, "ASCII"); |
| 589 | return buf; |
| 590 | } |
| 591 | else |
| 592 | codeset = ""; |
| 593 | } |
| 594 | else |
| 595 | codeset = ""; |
| 596 | |
| 597 | /* Resolve alias. */ |
| 598 | for (aliases = get_charset_aliases (); |
| 599 | *aliases != '\0'; |
| 600 | aliases += strlen (aliases) + 1, aliases += strlen (aliases) + 1) |
| 601 | if (strcmp (codeset, aliases) == 0 |
| 602 | || (aliases[0] == '*' && aliases[1] == '\0')) |
| 603 | { |
| 604 | codeset = aliases + strlen (aliases) + 1; |
| 605 | break; |
| 606 | } |
| 607 | |
| 608 | /* Don't return an empty string. GNU libc and GNU libiconv interpret |
| 609 | the empty string as denoting "the locale's character encoding", |
| 610 | thus GNU libiconv would call this function a second time. */ |
| 611 | if (codeset[0] == '\0') |
| 612 | /* Default to Latin-1, for backward compatibility with Guile 1.8. */ |
| 613 | codeset = "ISO-8859-1"; |
| 614 | |
| 615 | return codeset; |
| 616 | } |