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8690e634 JK |
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 General Public License as published by | |
7 | the Free Software Foundation; either version 3, 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 General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU 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 | } |