1 /* -*- buffer-read-only: t -*- vi: set ro: */ 2 /* DO NOT EDIT! GENERATED AUTOMATICALLY! */ 3 /* Determine a canonical name for the current locale's character encoding. 4 5 Copyright (C) 2000-2006, 2008-2011 Free Software Foundation, Inc. 6 7 This program 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 3, or (at your option) 10 any later version. 11 12 This program 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. 16 17 You should have received a copy of the GNU General Public License along 18 with this program; if not, write to the Free Software Foundation, 19 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ 20 21 /* Written by Bruno Haible <bruno@clisp.org>. */ 22 23 #include <config.h> 24 25 /* Specification. */ 26 #include "localcharset.h" 27 28 #include <fcntl.h> 29 #include <stddef.h> 30 #include <stdio.h> 31 #include <string.h> 32 #include <stdlib.h> 33 34 #if defined __APPLE__ && defined __MACH__ && HAVE_LANGINFO_CODESET 35 # define DARWIN7 /* Darwin 7 or newer, i.e. MacOS X 10.3 or newer */ 36 #endif 37 38 #if defined _WIN32 || defined __WIN32__ 39 # define WIN32_NATIVE 40 #endif 41 42 #if defined __EMX__ 43 /* Assume EMX program runs on OS/2, even if compiled under DOS. */ 44 # ifndef OS2 45 # define OS2 46 # endif 47 #endif 48 49 #if !defined WIN32_NATIVE 50 # include <unistd.h> 51 # if HAVE_LANGINFO_CODESET 52 # include <langinfo.h> 53 # else 54 # if 0 /* see comment below */ 55 # include <locale.h> 56 # endif 57 # endif 58 # ifdef __CYGWIN__ 59 # define WIN32_LEAN_AND_MEAN 60 # include <windows.h> 61 # endif 62 #elif defined WIN32_NATIVE 63 # define WIN32_LEAN_AND_MEAN 64 # include <windows.h> 65 #endif 66 #if defined OS2 67 # define INCL_DOS 68 # include <os2.h> 69 #endif 70 71 #if ENABLE_RELOCATABLE 72 # include "relocatable.h" 73 #else 74 # define relocate(pathname) (pathname) 75 #endif 76 77 /* Get LIBDIR. */ 78 #ifndef LIBDIR 79 # include "configmake.h" 80 #endif 81 82 /* Define O_NOFOLLOW to 0 on platforms where it does not exist. */ 83 #ifndef O_NOFOLLOW 84 # define O_NOFOLLOW 0 85 #endif 86 87 #if defined _WIN32 || defined __WIN32__ || defined __CYGWIN__ || defined __EMX__ || defined __DJGPP__ 88 /* Win32, Cygwin, OS/2, DOS */ 89 # define ISSLASH(C) ((C) == '/' || (C) == '\\') 90 #endif 91 92 #ifndef DIRECTORY_SEPARATOR 93 # define DIRECTORY_SEPARATOR '/' 94 #endif 95 96 #ifndef ISSLASH 97 # define ISSLASH(C) ((C) == DIRECTORY_SEPARATOR) 98 #endif 99 100 #if HAVE_DECL_GETC_UNLOCKED 101 # undef getc 102 # define getc getc_unlocked 103 #endif 104 105 /* The following static variable is declared 'volatile' to avoid a 106 possible multithread problem in the function get_charset_aliases. If we 107 are running in a threaded environment, and if two threads initialize 108 'charset_aliases' simultaneously, both will produce the same value, 109 and everything will be ok if the two assignments to 'charset_aliases' 110 are atomic. But I don't know what will happen if the two assignments mix. */ 111 #if __STDC__ != 1 112 # define volatile /* empty */ 113 #endif 114 /* Pointer to the contents of the charset.alias file, if it has already been 115 read, else NULL. Its format is: 116 ALIAS_1 '\0' CANONICAL_1 '\0' ... ALIAS_n '\0' CANONICAL_n '\0' '\0' */ 117 static const char * volatile charset_aliases; 118 119 /* Return a pointer to the contents of the charset.alias file. */ 120 static const char * 121 get_charset_aliases (void) 122 { 123 const char *cp; 124 125 cp = charset_aliases; 126 if (cp == NULL) 127 { 128 #if !(defined DARWIN7 || defined VMS || defined WIN32_NATIVE || defined __CYGWIN__) 129 const char *dir; 130 const char *base = "charset.alias"; 131 char *file_name; 132 133 /* Make it possible to override the charset.alias location. This is 134 necessary for running the testsuite before "make install". */ 135 dir = getenv ("CHARSETALIASDIR"); 136 if (dir == NULL || dir[0] == '\0') 137 dir = relocate (LIBDIR); 138 139 /* Concatenate dir and base into freshly allocated file_name. */ 140 { 141 size_t dir_len = strlen (dir); 142 size_t base_len = strlen (base); 143 int add_slash = (dir_len > 0 && !ISSLASH (dir[dir_len - 1])); 144 file_name = (char *) malloc (dir_len + add_slash + base_len + 1); 145 if (file_name != NULL) 146 { 147 memcpy (file_name, dir, dir_len); 148 if (add_slash) 149 file_name[dir_len] = DIRECTORY_SEPARATOR; 150 memcpy (file_name + dir_len + add_slash, base, base_len + 1); 151 } 152 } 153 154 if (file_name == NULL) 155 /* Out of memory. Treat the file as empty. */ 156 cp = ""; 157 else 158 { 159 int fd; 160 161 /* Open the file. Reject symbolic links on platforms that support 162 O_NOFOLLOW. This is a security feature. Without it, an attacker 163 could retrieve parts of the contents (namely, the tail of the 164 first line that starts with "* ") of an arbitrary file by placing 165 a symbolic link to that file under the name "charset.alias" in 166 some writable directory and defining the environment variable 167 CHARSETALIASDIR to point to that directory. */ 168 fd = open (file_name, 169 O_RDONLY | (HAVE_WORKING_O_NOFOLLOW ? O_NOFOLLOW : 0)); 170 if (fd < 0) 171 /* File not found. Treat it as empty. */ 172 cp = ""; 173 else 174 { 175 FILE *fp; 176 177 fp = fdopen (fd, "r"); 178 if (fp == NULL) 179 { 180 /* Out of memory. Treat the file as empty. */ 181 close (fd); 182 cp = ""; 183 } 184 else 185 { 186 /* Parse the file's contents. */ 187 char *res_ptr = NULL; 188 size_t res_size = 0; 189 190 for (;;) 191 { 192 int c; 193 char buf1[50+1]; 194 char buf2[50+1]; 195 size_t l1, l2; 196 char *old_res_ptr; 197 198 c = getc (fp); 199 if (c == EOF) 200 break; 201 if (c == '\n' || c == ' ' || c == '\t') 202 continue; 203 if (c == '#') 204 { 205 /* Skip comment, to end of line. */ 206 do 207 c = getc (fp); 208 while (!(c == EOF || c == '\n')); 209 if (c == EOF) 210 break; 211 continue; 212 } 213 ungetc (c, fp); 214 if (fscanf (fp, "%50s %50s", buf1, buf2) < 2) 215 break; 216 l1 = strlen (buf1); 217 l2 = strlen (buf2); 218 old_res_ptr = res_ptr; 219 if (res_size == 0) 220 { 221 res_size = l1 + 1 + l2 + 1; 222 res_ptr = (char *) malloc (res_size + 1); 223 } 224 else 225 { 226 res_size += l1 + 1 + l2 + 1; 227 res_ptr = (char *) realloc (res_ptr, res_size + 1); 228 } 229 if (res_ptr == NULL) 230 { 231 /* Out of memory. */ 232 res_size = 0; 233 free (old_res_ptr); 234 break; 235 } 236 strcpy (res_ptr + res_size - (l2 + 1) - (l1 + 1), buf1); 237 strcpy (res_ptr + res_size - (l2 + 1), buf2); 238 } 239 fclose (fp); 240 if (res_size == 0) 241 cp = ""; 242 else 243 { 244 *(res_ptr + res_size) = '\0'; 245 cp = res_ptr; 246 } 247 } 248 } 249 250 free (file_name); 251 } 252 253 #else 254 255 # if defined DARWIN7 256 /* To avoid the trouble of installing a file that is shared by many 257 GNU packages -- many packaging systems have problems with this --, 258 simply inline the aliases here. */ 259 cp = "ISO8859-1" "\0" "ISO-8859-1" "\0" 260 "ISO8859-2" "\0" "ISO-8859-2" "\0" 261 "ISO8859-4" "\0" "ISO-8859-4" "\0" 262 "ISO8859-5" "\0" "ISO-8859-5" "\0" 263 "ISO8859-7" "\0" "ISO-8859-7" "\0" 264 "ISO8859-9" "\0" "ISO-8859-9" "\0" 265 "ISO8859-13" "\0" "ISO-8859-13" "\0" 266 "ISO8859-15" "\0" "ISO-8859-15" "\0" 267 "KOI8-R" "\0" "KOI8-R" "\0" 268 "KOI8-U" "\0" "KOI8-U" "\0" 269 "CP866" "\0" "CP866" "\0" 270 "CP949" "\0" "CP949" "\0" 271 "CP1131" "\0" "CP1131" "\0" 272 "CP1251" "\0" "CP1251" "\0" 273 "eucCN" "\0" "GB2312" "\0" 274 "GB2312" "\0" "GB2312" "\0" 275 "eucJP" "\0" "EUC-JP" "\0" 276 "eucKR" "\0" "EUC-KR" "\0" 277 "Big5" "\0" "BIG5" "\0" 278 "Big5HKSCS" "\0" "BIG5-HKSCS" "\0" 279 "GBK" "\0" "GBK" "\0" 280 "GB18030" "\0" "GB18030" "\0" 281 "SJIS" "\0" "SHIFT_JIS" "\0" 282 "ARMSCII-8" "\0" "ARMSCII-8" "\0" 283 "PT154" "\0" "PT154" "\0" 284 /*"ISCII-DEV" "\0" "?" "\0"*/ 285 "*" "\0" "UTF-8" "\0"; 286 # endif 287 288 # if defined VMS 289 /* To avoid the troubles of an extra file charset.alias_vms in the 290 sources of many GNU packages, simply inline the aliases here. */ 291 /* The list of encodings is taken from the OpenVMS 7.3-1 documentation 292 "Compaq C Run-Time Library Reference Manual for OpenVMS systems" 293 section 10.7 "Handling Different Character Sets". */ 294 cp = "ISO8859-1" "\0" "ISO-8859-1" "\0" 295 "ISO8859-2" "\0" "ISO-8859-2" "\0" 296 "ISO8859-5" "\0" "ISO-8859-5" "\0" 297 "ISO8859-7" "\0" "ISO-8859-7" "\0" 298 "ISO8859-8" "\0" "ISO-8859-8" "\0" 299 "ISO8859-9" "\0" "ISO-8859-9" "\0" 300 /* Japanese */ 301 "eucJP" "\0" "EUC-JP" "\0" 302 "SJIS" "\0" "SHIFT_JIS" "\0" 303 "DECKANJI" "\0" "DEC-KANJI" "\0" 304 "SDECKANJI" "\0" "EUC-JP" "\0" 305 /* Chinese */ 306 "eucTW" "\0" "EUC-TW" "\0" 307 "DECHANYU" "\0" "DEC-HANYU" "\0" 308 "DECHANZI" "\0" "GB2312" "\0" 309 /* Korean */ 310 "DECKOREAN" "\0" "EUC-KR" "\0"; 311 # endif 312 313 # if defined WIN32_NATIVE || defined __CYGWIN__ 314 /* To avoid the troubles of installing a separate file in the same 315 directory as the DLL and of retrieving the DLL's directory at 316 runtime, simply inline the aliases here. */ 317 318 cp = "CP936" "\0" "GBK" "\0" 319 "CP1361" "\0" "JOHAB" "\0" 320 "CP20127" "\0" "ASCII" "\0" 321 "CP20866" "\0" "KOI8-R" "\0" 322 "CP20936" "\0" "GB2312" "\0" 323 "CP21866" "\0" "KOI8-RU" "\0" 324 "CP28591" "\0" "ISO-8859-1" "\0" 325 "CP28592" "\0" "ISO-8859-2" "\0" 326 "CP28593" "\0" "ISO-8859-3" "\0" 327 "CP28594" "\0" "ISO-8859-4" "\0" 328 "CP28595" "\0" "ISO-8859-5" "\0" 329 "CP28596" "\0" "ISO-8859-6" "\0" 330 "CP28597" "\0" "ISO-8859-7" "\0" 331 "CP28598" "\0" "ISO-8859-8" "\0" 332 "CP28599" "\0" "ISO-8859-9" "\0" 333 "CP28605" "\0" "ISO-8859-15" "\0" 334 "CP38598" "\0" "ISO-8859-8" "\0" 335 "CP51932" "\0" "EUC-JP" "\0" 336 "CP51936" "\0" "GB2312" "\0" 337 "CP51949" "\0" "EUC-KR" "\0" 338 "CP51950" "\0" "EUC-TW" "\0" 339 "CP54936" "\0" "GB18030" "\0" 340 "CP65001" "\0" "UTF-8" "\0"; 341 # endif 342 #endif 343 344 charset_aliases = cp; 345 } 346 347 return cp; 348 } 349 350 /* Determine the current locale's character encoding, and canonicalize it 351 into one of the canonical names listed in config.charset. 352 The result must not be freed; it is statically allocated. 353 If the canonical name cannot be determined, the result is a non-canonical 354 name. */ 355 356 #ifdef STATIC 357 STATIC 358 #endif 359 const char * 360 locale_charset (void) 361 { 362 const char *codeset; 363 const char *aliases; 364 365 #if !(defined WIN32_NATIVE || defined OS2) 366 367 # if HAVE_LANGINFO_CODESET 368 369 /* Most systems support nl_langinfo (CODESET) nowadays. */ 370 codeset = nl_langinfo (CODESET); 371 372 # ifdef __CYGWIN__ 373 /* Cygwin < 1.7 does not have locales. nl_langinfo (CODESET) always 374 returns "US-ASCII". Return the suffix of the locale name from the 375 environment variables (if present) or the codepage as a number. */ 376 if (codeset != NULL && strcmp (codeset, "US-ASCII") == 0) 377 { 378 const char *locale; 379 static char buf[2 + 10 + 1]; 380 381 locale = getenv ("LC_ALL"); 382 if (locale == NULL || locale[0] == '\0') 383 { 384 locale = getenv ("LC_CTYPE"); 385 if (locale == NULL || locale[0] == '\0') 386 locale = getenv ("LANG"); 387 } 388 if (locale != NULL && locale[0] != '\0') 389 { 390 /* If the locale name contains an encoding after the dot, return 391 it. */ 392 const char *dot = strchr (locale, '.'); 393 394 if (dot != NULL) 395 { 396 const char *modifier; 397 398 dot++; 399 /* Look for the possible @... trailer and remove it, if any. */ 400 modifier = strchr (dot, '@'); 401 if (modifier == NULL) 402 return dot; 403 if (modifier - dot < sizeof (buf)) 404 { 405 memcpy (buf, dot, modifier - dot); 406 buf [modifier - dot] = '\0'; 407 return buf; 408 } 409 } 410 } 411 412 /* Woe32 has a function returning the locale's codepage as a number: 413 GetACP(). This encoding is used by Cygwin, unless the user has set 414 the environment variable CYGWIN=codepage:oem (which very few people 415 do). 416 Output directed to console windows needs to be converted (to 417 GetOEMCP() if the console is using a raster font, or to 418 GetConsoleOutputCP() if it is using a TrueType font). Cygwin does 419 this conversion transparently (see winsup/cygwin/fhandler_console.cc), 420 converting to GetConsoleOutputCP(). This leads to correct results, 421 except when SetConsoleOutputCP has been called and a raster font is 422 in use. */ 423 sprintf (buf, "CP%u", GetACP ()); 424 codeset = buf; 425 } 426 # endif 427 428 # else 429 430 /* On old systems which lack it, use setlocale or getenv. */ 431 const char *locale = NULL; 432 433 /* But most old systems don't have a complete set of locales. Some 434 (like SunOS 4 or DJGPP) have only the C locale. Therefore we don't 435 use setlocale here; it would return "C" when it doesn't support the 436 locale name the user has set. */ 437 # if 0 438 locale = setlocale (LC_CTYPE, NULL); 439 # endif 440 if (locale == NULL || locale[0] == '\0') 441 { 442 locale = getenv ("LC_ALL"); 443 if (locale == NULL || locale[0] == '\0') 444 { 445 locale = getenv ("LC_CTYPE"); 446 if (locale == NULL || locale[0] == '\0') 447 locale = getenv ("LANG"); 448 } 449 } 450 451 /* On some old systems, one used to set locale = "iso8859_1". On others, 452 you set it to "language_COUNTRY.charset". In any case, we resolve it 453 through the charset.alias file. */ 454 codeset = locale; 455 456 # endif 457 458 #elif defined WIN32_NATIVE 459 460 static char buf[2 + 10 + 1]; 461 462 /* Woe32 has a function returning the locale's codepage as a number: 463 GetACP(). 464 When the output goes to a console window, it needs to be provided in 465 GetOEMCP() encoding if the console is using a raster font, or in 466 GetConsoleOutputCP() encoding if it is using a TrueType font. 467 But in GUI programs and for output sent to files and pipes, GetACP() 468 encoding is the best bet. */ 469 sprintf (buf, "CP%u", GetACP ()); 470 codeset = buf; 471 472 #elif defined OS2 473 474 const char *locale; 475 static char buf[2 + 10 + 1]; 476 ULONG cp[3]; 477 ULONG cplen; 478 479 /* Allow user to override the codeset, as set in the operating system, 480 with standard language environment variables. */ 481 locale = getenv ("LC_ALL"); 482 if (locale == NULL || locale[0] == '\0') 483 { 484 locale = getenv ("LC_CTYPE"); 485 if (locale == NULL || locale[0] == '\0') 486 locale = getenv ("LANG"); 487 } 488 if (locale != NULL && locale[0] != '\0') 489 { 490 /* If the locale name contains an encoding after the dot, return it. */ 491 const char *dot = strchr (locale, '.'); 492 493 if (dot != NULL) 494 { 495 const char *modifier; 496 497 dot++; 498 /* Look for the possible @... trailer and remove it, if any. */ 499 modifier = strchr (dot, '@'); 500 if (modifier == NULL) 501 return dot; 502 if (modifier - dot < sizeof (buf)) 503 { 504 memcpy (buf, dot, modifier - dot); 505 buf [modifier - dot] = '\0'; 506 return buf; 507 } 508 } 509 510 /* Resolve through the charset.alias file. */ 511 codeset = locale; 512 } 513 else 514 { 515 /* OS/2 has a function returning the locale's codepage as a number. */ 516 if (DosQueryCp (sizeof (cp), cp, &cplen)) 517 codeset = ""; 518 else 519 { 520 sprintf (buf, "CP%u", cp[0]); 521 codeset = buf; 522 } 523 } 524 525 #endif 526 527 if (codeset == NULL) 528 /* The canonical name cannot be determined. */ 529 codeset = ""; 530 531 /* Resolve alias. */ 532 for (aliases = get_charset_aliases (); 533 *aliases != '\0'; 534 aliases += strlen (aliases) + 1, aliases += strlen (aliases) + 1) 535 if (strcmp (codeset, aliases) == 0 536 || (aliases[0] == '*' && aliases[1] == '\0')) 537 { 538 codeset = aliases + strlen (aliases) + 1; 539 break; 540 } 541 542 /* Don't return an empty string. GNU libc and GNU libiconv interpret 543 the empty string as denoting "the locale's character encoding", 544 thus GNU libiconv would call this function a second time. */ 545 if (codeset[0] == '\0') 546 codeset = "ASCII"; 547 548 return codeset; 549 } 550