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7f8e40b7 NJ |
1 | /* Determine a canonical name for the current locale's character encoding. |
2 | ||
f240aacb | 3 | Copyright (C) 2000-2006, 2008-2009 Free Software Foundation, Inc. |
7f8e40b7 NJ |
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, write to the Free Software Foundation, | |
17 | Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ | |
18 | ||
19 | /* Written by Bruno Haible <bruno@clisp.org>. */ | |
20 | ||
21 | #include <config.h> | |
22 | ||
23 | /* Specification. */ | |
24 | #include "localcharset.h" | |
25 | ||
26 | #include <stddef.h> | |
27 | #include <stdio.h> | |
28 | #include <string.h> | |
29 | #include <stdlib.h> | |
30 | ||
f240aacb LC |
31 | #if defined __APPLE__ && defined __MACH__ && HAVE_LANGINFO_CODESET |
32 | # define DARWIN7 /* Darwin 7 or newer, i.e. MacOS X 10.3 or newer */ | |
33 | #endif | |
34 | ||
7f8e40b7 NJ |
35 | #if defined _WIN32 || defined __WIN32__ |
36 | # define WIN32_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 WIN32_NATIVE | |
47 | # if HAVE_LANGINFO_CODESET | |
48 | # include <langinfo.h> | |
49 | # else | |
50 | # if 0 /* see comment below */ | |
51 | # include <locale.h> | |
52 | # endif | |
53 | # endif | |
54 | # ifdef __CYGWIN__ | |
55 | # define WIN32_LEAN_AND_MEAN | |
56 | # include <windows.h> | |
57 | # endif | |
58 | #elif defined WIN32_NATIVE | |
59 | # define WIN32_LEAN_AND_MEAN | |
60 | # include <windows.h> | |
61 | #endif | |
62 | #if defined OS2 | |
63 | # define INCL_DOS | |
64 | # include <os2.h> | |
65 | #endif | |
66 | ||
67 | #if ENABLE_RELOCATABLE | |
68 | # include "relocatable.h" | |
69 | #else | |
70 | # define relocate(pathname) (pathname) | |
71 | #endif | |
72 | ||
73 | /* Get LIBDIR. */ | |
74 | #ifndef LIBDIR | |
75 | # include "configmake.h" | |
76 | #endif | |
77 | ||
78 | #if defined _WIN32 || defined __WIN32__ || defined __CYGWIN__ || defined __EMX__ || defined __DJGPP__ | |
79 | /* Win32, Cygwin, OS/2, DOS */ | |
80 | # define ISSLASH(C) ((C) == '/' || (C) == '\\') | |
81 | #endif | |
82 | ||
83 | #ifndef DIRECTORY_SEPARATOR | |
84 | # define DIRECTORY_SEPARATOR '/' | |
85 | #endif | |
86 | ||
87 | #ifndef ISSLASH | |
88 | # define ISSLASH(C) ((C) == DIRECTORY_SEPARATOR) | |
89 | #endif | |
90 | ||
91 | #if HAVE_DECL_GETC_UNLOCKED | |
92 | # undef getc | |
93 | # define getc getc_unlocked | |
94 | #endif | |
95 | ||
96 | /* The following static variable is declared 'volatile' to avoid a | |
97 | possible multithread problem in the function get_charset_aliases. If we | |
98 | are running in a threaded environment, and if two threads initialize | |
99 | 'charset_aliases' simultaneously, both will produce the same value, | |
100 | and everything will be ok if the two assignments to 'charset_aliases' | |
101 | are atomic. But I don't know what will happen if the two assignments mix. */ | |
102 | #if __STDC__ != 1 | |
103 | # define volatile /* empty */ | |
104 | #endif | |
105 | /* Pointer to the contents of the charset.alias file, if it has already been | |
106 | read, else NULL. Its format is: | |
107 | ALIAS_1 '\0' CANONICAL_1 '\0' ... ALIAS_n '\0' CANONICAL_n '\0' '\0' */ | |
108 | static const char * volatile charset_aliases; | |
109 | ||
110 | /* Return a pointer to the contents of the charset.alias file. */ | |
111 | static const char * | |
112 | get_charset_aliases (void) | |
113 | { | |
114 | const char *cp; | |
115 | ||
116 | cp = charset_aliases; | |
117 | if (cp == NULL) | |
118 | { | |
f240aacb | 119 | #if !(defined DARWIN7 || defined VMS || defined WIN32_NATIVE || defined __CYGWIN__) |
7f8e40b7 NJ |
120 | FILE *fp; |
121 | const char *dir; | |
122 | const char *base = "charset.alias"; | |
123 | char *file_name; | |
124 | ||
125 | /* Make it possible to override the charset.alias location. This is | |
126 | necessary for running the testsuite before "make install". */ | |
127 | dir = getenv ("CHARSETALIASDIR"); | |
128 | if (dir == NULL || dir[0] == '\0') | |
129 | dir = relocate (LIBDIR); | |
130 | ||
131 | /* Concatenate dir and base into freshly allocated file_name. */ | |
132 | { | |
133 | size_t dir_len = strlen (dir); | |
134 | size_t base_len = strlen (base); | |
135 | int add_slash = (dir_len > 0 && !ISSLASH (dir[dir_len - 1])); | |
136 | file_name = (char *) malloc (dir_len + add_slash + base_len + 1); | |
137 | if (file_name != NULL) | |
138 | { | |
139 | memcpy (file_name, dir, dir_len); | |
140 | if (add_slash) | |
141 | file_name[dir_len] = DIRECTORY_SEPARATOR; | |
142 | memcpy (file_name + dir_len + add_slash, base, base_len + 1); | |
143 | } | |
144 | } | |
145 | ||
146 | if (file_name == NULL || (fp = fopen (file_name, "r")) == NULL) | |
147 | /* Out of memory or file not found, treat it as empty. */ | |
148 | cp = ""; | |
149 | else | |
150 | { | |
151 | /* Parse the file's contents. */ | |
152 | char *res_ptr = NULL; | |
153 | size_t res_size = 0; | |
154 | ||
155 | for (;;) | |
156 | { | |
157 | int c; | |
158 | char buf1[50+1]; | |
159 | char buf2[50+1]; | |
160 | size_t l1, l2; | |
161 | char *old_res_ptr; | |
162 | ||
163 | c = getc (fp); | |
164 | if (c == EOF) | |
165 | break; | |
166 | if (c == '\n' || c == ' ' || c == '\t') | |
167 | continue; | |
168 | if (c == '#') | |
169 | { | |
170 | /* Skip comment, to end of line. */ | |
171 | do | |
172 | c = getc (fp); | |
173 | while (!(c == EOF || c == '\n')); | |
174 | if (c == EOF) | |
175 | break; | |
176 | continue; | |
177 | } | |
178 | ungetc (c, fp); | |
179 | if (fscanf (fp, "%50s %50s", buf1, buf2) < 2) | |
180 | break; | |
181 | l1 = strlen (buf1); | |
182 | l2 = strlen (buf2); | |
183 | old_res_ptr = res_ptr; | |
184 | if (res_size == 0) | |
185 | { | |
186 | res_size = l1 + 1 + l2 + 1; | |
187 | res_ptr = (char *) malloc (res_size + 1); | |
188 | } | |
189 | else | |
190 | { | |
191 | res_size += l1 + 1 + l2 + 1; | |
192 | res_ptr = (char *) realloc (res_ptr, res_size + 1); | |
193 | } | |
194 | if (res_ptr == NULL) | |
195 | { | |
196 | /* Out of memory. */ | |
197 | res_size = 0; | |
198 | if (old_res_ptr != NULL) | |
199 | free (old_res_ptr); | |
200 | break; | |
201 | } | |
202 | strcpy (res_ptr + res_size - (l2 + 1) - (l1 + 1), buf1); | |
203 | strcpy (res_ptr + res_size - (l2 + 1), buf2); | |
204 | } | |
205 | fclose (fp); | |
206 | if (res_size == 0) | |
207 | cp = ""; | |
208 | else | |
209 | { | |
210 | *(res_ptr + res_size) = '\0'; | |
211 | cp = res_ptr; | |
212 | } | |
213 | } | |
214 | ||
215 | if (file_name != NULL) | |
216 | free (file_name); | |
217 | ||
218 | #else | |
219 | ||
f240aacb LC |
220 | # if defined DARWIN7 |
221 | /* To avoid the trouble of installing a file that is shared by many | |
222 | GNU packages -- many packaging systems have problems with this --, | |
223 | simply inline the aliases here. */ | |
224 | cp = "ISO8859-1" "\0" "ISO-8859-1" "\0" | |
225 | "ISO8859-2" "\0" "ISO-8859-2" "\0" | |
226 | "ISO8859-4" "\0" "ISO-8859-4" "\0" | |
227 | "ISO8859-5" "\0" "ISO-8859-5" "\0" | |
228 | "ISO8859-7" "\0" "ISO-8859-7" "\0" | |
229 | "ISO8859-9" "\0" "ISO-8859-9" "\0" | |
230 | "ISO8859-13" "\0" "ISO-8859-13" "\0" | |
231 | "ISO8859-15" "\0" "ISO-8859-15" "\0" | |
232 | "KOI8-R" "\0" "KOI8-R" "\0" | |
233 | "KOI8-U" "\0" "KOI8-U" "\0" | |
234 | "CP866" "\0" "CP866" "\0" | |
235 | "CP949" "\0" "CP949" "\0" | |
236 | "CP1131" "\0" "CP1131" "\0" | |
237 | "CP1251" "\0" "CP1251" "\0" | |
238 | "eucCN" "\0" "GB2312" "\0" | |
239 | "GB2312" "\0" "GB2312" "\0" | |
240 | "eucJP" "\0" "EUC-JP" "\0" | |
241 | "eucKR" "\0" "EUC-KR" "\0" | |
242 | "Big5" "\0" "BIG5" "\0" | |
243 | "Big5HKSCS" "\0" "BIG5-HKSCS" "\0" | |
244 | "GBK" "\0" "GBK" "\0" | |
245 | "GB18030" "\0" "GB18030" "\0" | |
246 | "SJIS" "\0" "SHIFT_JIS" "\0" | |
247 | "ARMSCII-8" "\0" "ARMSCII-8" "\0" | |
248 | "PT154" "\0" "PT154" "\0" | |
249 | /*"ISCII-DEV" "\0" "?" "\0"*/ | |
250 | "*" "\0" "UTF-8" "\0"; | |
251 | # endif | |
252 | ||
7f8e40b7 NJ |
253 | # if defined VMS |
254 | /* To avoid the troubles of an extra file charset.alias_vms in the | |
255 | sources of many GNU packages, simply inline the aliases here. */ | |
256 | /* The list of encodings is taken from the OpenVMS 7.3-1 documentation | |
257 | "Compaq C Run-Time Library Reference Manual for OpenVMS systems" | |
258 | section 10.7 "Handling Different Character Sets". */ | |
259 | cp = "ISO8859-1" "\0" "ISO-8859-1" "\0" | |
260 | "ISO8859-2" "\0" "ISO-8859-2" "\0" | |
261 | "ISO8859-5" "\0" "ISO-8859-5" "\0" | |
262 | "ISO8859-7" "\0" "ISO-8859-7" "\0" | |
263 | "ISO8859-8" "\0" "ISO-8859-8" "\0" | |
264 | "ISO8859-9" "\0" "ISO-8859-9" "\0" | |
265 | /* Japanese */ | |
266 | "eucJP" "\0" "EUC-JP" "\0" | |
267 | "SJIS" "\0" "SHIFT_JIS" "\0" | |
268 | "DECKANJI" "\0" "DEC-KANJI" "\0" | |
269 | "SDECKANJI" "\0" "EUC-JP" "\0" | |
270 | /* Chinese */ | |
271 | "eucTW" "\0" "EUC-TW" "\0" | |
272 | "DECHANYU" "\0" "DEC-HANYU" "\0" | |
273 | "DECHANZI" "\0" "GB2312" "\0" | |
274 | /* Korean */ | |
275 | "DECKOREAN" "\0" "EUC-KR" "\0"; | |
276 | # endif | |
277 | ||
278 | # if defined WIN32_NATIVE || defined __CYGWIN__ | |
279 | /* To avoid the troubles of installing a separate file in the same | |
280 | directory as the DLL and of retrieving the DLL's directory at | |
281 | runtime, simply inline the aliases here. */ | |
282 | ||
283 | cp = "CP936" "\0" "GBK" "\0" | |
284 | "CP1361" "\0" "JOHAB" "\0" | |
285 | "CP20127" "\0" "ASCII" "\0" | |
286 | "CP20866" "\0" "KOI8-R" "\0" | |
287 | "CP20936" "\0" "GB2312" "\0" | |
288 | "CP21866" "\0" "KOI8-RU" "\0" | |
289 | "CP28591" "\0" "ISO-8859-1" "\0" | |
290 | "CP28592" "\0" "ISO-8859-2" "\0" | |
291 | "CP28593" "\0" "ISO-8859-3" "\0" | |
292 | "CP28594" "\0" "ISO-8859-4" "\0" | |
293 | "CP28595" "\0" "ISO-8859-5" "\0" | |
294 | "CP28596" "\0" "ISO-8859-6" "\0" | |
295 | "CP28597" "\0" "ISO-8859-7" "\0" | |
296 | "CP28598" "\0" "ISO-8859-8" "\0" | |
297 | "CP28599" "\0" "ISO-8859-9" "\0" | |
298 | "CP28605" "\0" "ISO-8859-15" "\0" | |
299 | "CP38598" "\0" "ISO-8859-8" "\0" | |
300 | "CP51932" "\0" "EUC-JP" "\0" | |
301 | "CP51936" "\0" "GB2312" "\0" | |
302 | "CP51949" "\0" "EUC-KR" "\0" | |
303 | "CP51950" "\0" "EUC-TW" "\0" | |
304 | "CP54936" "\0" "GB18030" "\0" | |
305 | "CP65001" "\0" "UTF-8" "\0"; | |
306 | # endif | |
307 | #endif | |
308 | ||
309 | charset_aliases = cp; | |
310 | } | |
311 | ||
312 | return cp; | |
313 | } | |
314 | ||
315 | /* Determine the current locale's character encoding, and canonicalize it | |
316 | into one of the canonical names listed in config.charset. | |
317 | The result must not be freed; it is statically allocated. | |
318 | If the canonical name cannot be determined, the result is a non-canonical | |
319 | name. */ | |
320 | ||
321 | #ifdef STATIC | |
322 | STATIC | |
323 | #endif | |
324 | const char * | |
325 | locale_charset (void) | |
326 | { | |
327 | const char *codeset; | |
328 | const char *aliases; | |
329 | ||
330 | #if !(defined WIN32_NATIVE || defined OS2) | |
331 | ||
332 | # if HAVE_LANGINFO_CODESET | |
333 | ||
334 | /* Most systems support nl_langinfo (CODESET) nowadays. */ | |
335 | codeset = nl_langinfo (CODESET); | |
336 | ||
337 | # ifdef __CYGWIN__ | |
338 | /* Cygwin 2006 does not have locales. nl_langinfo (CODESET) always | |
339 | returns "US-ASCII". As long as this is not fixed, return the suffix | |
340 | of the locale name from the environment variables (if present) or | |
341 | the codepage as a number. */ | |
342 | if (codeset != NULL && strcmp (codeset, "US-ASCII") == 0) | |
343 | { | |
344 | const char *locale; | |
345 | static char buf[2 + 10 + 1]; | |
346 | ||
347 | locale = getenv ("LC_ALL"); | |
348 | if (locale == NULL || locale[0] == '\0') | |
349 | { | |
350 | locale = getenv ("LC_CTYPE"); | |
351 | if (locale == NULL || locale[0] == '\0') | |
352 | locale = getenv ("LANG"); | |
353 | } | |
354 | if (locale != NULL && locale[0] != '\0') | |
355 | { | |
356 | /* If the locale name contains an encoding after the dot, return | |
357 | it. */ | |
358 | const char *dot = strchr (locale, '.'); | |
359 | ||
360 | if (dot != NULL) | |
361 | { | |
362 | const char *modifier; | |
363 | ||
364 | dot++; | |
365 | /* Look for the possible @... trailer and remove it, if any. */ | |
366 | modifier = strchr (dot, '@'); | |
367 | if (modifier == NULL) | |
368 | return dot; | |
369 | if (modifier - dot < sizeof (buf)) | |
370 | { | |
371 | memcpy (buf, dot, modifier - dot); | |
372 | buf [modifier - dot] = '\0'; | |
373 | return buf; | |
374 | } | |
375 | } | |
376 | } | |
377 | ||
378 | /* Woe32 has a function returning the locale's codepage as a number. */ | |
379 | sprintf (buf, "CP%u", GetACP ()); | |
380 | codeset = buf; | |
381 | } | |
382 | # endif | |
383 | ||
384 | # else | |
385 | ||
386 | /* On old systems which lack it, use setlocale or getenv. */ | |
387 | const char *locale = NULL; | |
388 | ||
389 | /* But most old systems don't have a complete set of locales. Some | |
390 | (like SunOS 4 or DJGPP) have only the C locale. Therefore we don't | |
391 | use setlocale here; it would return "C" when it doesn't support the | |
392 | locale name the user has set. */ | |
393 | # if 0 | |
394 | locale = setlocale (LC_CTYPE, NULL); | |
395 | # endif | |
396 | if (locale == NULL || locale[0] == '\0') | |
397 | { | |
398 | locale = getenv ("LC_ALL"); | |
399 | if (locale == NULL || locale[0] == '\0') | |
400 | { | |
401 | locale = getenv ("LC_CTYPE"); | |
402 | if (locale == NULL || locale[0] == '\0') | |
403 | locale = getenv ("LANG"); | |
404 | } | |
405 | } | |
406 | ||
407 | /* On some old systems, one used to set locale = "iso8859_1". On others, | |
408 | you set it to "language_COUNTRY.charset". In any case, we resolve it | |
409 | through the charset.alias file. */ | |
410 | codeset = locale; | |
411 | ||
412 | # endif | |
413 | ||
414 | #elif defined WIN32_NATIVE | |
415 | ||
416 | static char buf[2 + 10 + 1]; | |
417 | ||
418 | /* Woe32 has a function returning the locale's codepage as a number. */ | |
419 | sprintf (buf, "CP%u", GetACP ()); | |
420 | codeset = buf; | |
421 | ||
422 | #elif defined OS2 | |
423 | ||
424 | const char *locale; | |
425 | static char buf[2 + 10 + 1]; | |
426 | ULONG cp[3]; | |
427 | ULONG cplen; | |
428 | ||
429 | /* Allow user to override the codeset, as set in the operating system, | |
430 | with standard language environment variables. */ | |
431 | locale = getenv ("LC_ALL"); | |
432 | if (locale == NULL || locale[0] == '\0') | |
433 | { | |
434 | locale = getenv ("LC_CTYPE"); | |
435 | if (locale == NULL || locale[0] == '\0') | |
436 | locale = getenv ("LANG"); | |
437 | } | |
438 | if (locale != NULL && locale[0] != '\0') | |
439 | { | |
440 | /* If the locale name contains an encoding after the dot, return it. */ | |
441 | const char *dot = strchr (locale, '.'); | |
442 | ||
443 | if (dot != NULL) | |
444 | { | |
445 | const char *modifier; | |
446 | ||
447 | dot++; | |
448 | /* Look for the possible @... trailer and remove it, if any. */ | |
449 | modifier = strchr (dot, '@'); | |
450 | if (modifier == NULL) | |
451 | return dot; | |
452 | if (modifier - dot < sizeof (buf)) | |
453 | { | |
454 | memcpy (buf, dot, modifier - dot); | |
455 | buf [modifier - dot] = '\0'; | |
456 | return buf; | |
457 | } | |
458 | } | |
459 | ||
460 | /* Resolve through the charset.alias file. */ | |
461 | codeset = locale; | |
462 | } | |
463 | else | |
464 | { | |
465 | /* OS/2 has a function returning the locale's codepage as a number. */ | |
466 | if (DosQueryCp (sizeof (cp), cp, &cplen)) | |
467 | codeset = ""; | |
468 | else | |
469 | { | |
470 | sprintf (buf, "CP%u", cp[0]); | |
471 | codeset = buf; | |
472 | } | |
473 | } | |
474 | ||
475 | #endif | |
476 | ||
477 | if (codeset == NULL) | |
478 | /* The canonical name cannot be determined. */ | |
479 | codeset = ""; | |
480 | ||
481 | /* Resolve alias. */ | |
482 | for (aliases = get_charset_aliases (); | |
483 | *aliases != '\0'; | |
484 | aliases += strlen (aliases) + 1, aliases += strlen (aliases) + 1) | |
485 | if (strcmp (codeset, aliases) == 0 | |
486 | || (aliases[0] == '*' && aliases[1] == '\0')) | |
487 | { | |
488 | codeset = aliases + strlen (aliases) + 1; | |
489 | break; | |
490 | } | |
491 | ||
492 | /* Don't return an empty string. GNU libc and GNU libiconv interpret | |
493 | the empty string as denoting "the locale's character encoding", | |
494 | thus GNU libiconv would call this function a second time. */ | |
495 | if (codeset[0] == '\0') | |
496 | codeset = "ASCII"; | |
497 | ||
498 | return codeset; | |
499 | } |