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c2c2b5a4 LC |
1 | /* Determine a canonical name for the current locale's character encoding. |
2 | ||
5e69ceb7 | 3 | Copyright (C) 2000-2006, 2008-2014 Free Software Foundation, Inc. |
c2c2b5a4 LC |
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 | |
005de2e8 | 16 | with this program; if not, see <http://www.gnu.org/licenses/>. */ |
c2c2b5a4 LC |
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 | |
005de2e8 | 32 | # define DARWIN7 /* Darwin 7 or newer, i.e. Mac OS X 10.3 or newer */ |
c2c2b5a4 LC |
33 | #endif |
34 | ||
35 | #if defined _WIN32 || defined __WIN32__ | |
f0007cad | 36 | # define WINDOWS_NATIVE |
c2c2b5a4 LC |
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 | ||
f0007cad | 46 | #if !defined WINDOWS_NATIVE |
c2c2b5a4 LC |
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 | |
f0007cad | 59 | #elif defined WINDOWS_NATIVE |
c2c2b5a4 LC |
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 | ||
5e69ceb7 MW |
68 | /* For MB_CUR_MAX_L */ |
69 | #if defined DARWIN7 | |
70 | # include <xlocale.h> | |
71 | #endif | |
72 | ||
c2c2b5a4 LC |
73 | #if ENABLE_RELOCATABLE |
74 | # include "relocatable.h" | |
75 | #else | |
76 | # define relocate(pathname) (pathname) | |
77 | #endif | |
78 | ||
79 | /* Get LIBDIR. */ | |
80 | #ifndef LIBDIR | |
81 | # include "configmake.h" | |
82 | #endif | |
83 | ||
84 | /* Define O_NOFOLLOW to 0 on platforms where it does not exist. */ | |
85 | #ifndef O_NOFOLLOW | |
86 | # define O_NOFOLLOW 0 | |
87 | #endif | |
88 | ||
89 | #if defined _WIN32 || defined __WIN32__ || defined __CYGWIN__ || defined __EMX__ || defined __DJGPP__ | |
f0007cad | 90 | /* Native Windows, Cygwin, OS/2, DOS */ |
c2c2b5a4 LC |
91 | # define ISSLASH(C) ((C) == '/' || (C) == '\\') |
92 | #endif | |
93 | ||
94 | #ifndef DIRECTORY_SEPARATOR | |
95 | # define DIRECTORY_SEPARATOR '/' | |
96 | #endif | |
97 | ||
98 | #ifndef ISSLASH | |
99 | # define ISSLASH(C) ((C) == DIRECTORY_SEPARATOR) | |
100 | #endif | |
101 | ||
102 | #if HAVE_DECL_GETC_UNLOCKED | |
103 | # undef getc | |
104 | # define getc getc_unlocked | |
105 | #endif | |
106 | ||
107 | /* The following static variable is declared 'volatile' to avoid a | |
108 | possible multithread problem in the function get_charset_aliases. If we | |
109 | are running in a threaded environment, and if two threads initialize | |
110 | 'charset_aliases' simultaneously, both will produce the same value, | |
111 | and everything will be ok if the two assignments to 'charset_aliases' | |
112 | are atomic. But I don't know what will happen if the two assignments mix. */ | |
113 | #if __STDC__ != 1 | |
114 | # define volatile /* empty */ | |
115 | #endif | |
116 | /* Pointer to the contents of the charset.alias file, if it has already been | |
117 | read, else NULL. Its format is: | |
118 | ALIAS_1 '\0' CANONICAL_1 '\0' ... ALIAS_n '\0' CANONICAL_n '\0' '\0' */ | |
119 | static const char * volatile charset_aliases; | |
120 | ||
121 | /* Return a pointer to the contents of the charset.alias file. */ | |
122 | static const char * | |
123 | get_charset_aliases (void) | |
124 | { | |
125 | const char *cp; | |
126 | ||
127 | cp = charset_aliases; | |
128 | if (cp == NULL) | |
129 | { | |
f0007cad | 130 | #if !(defined DARWIN7 || defined VMS || defined WINDOWS_NATIVE || defined __CYGWIN__) |
c2c2b5a4 LC |
131 | const char *dir; |
132 | const char *base = "charset.alias"; | |
133 | char *file_name; | |
134 | ||
135 | /* Make it possible to override the charset.alias location. This is | |
136 | necessary for running the testsuite before "make install". */ | |
137 | dir = getenv ("CHARSETALIASDIR"); | |
138 | if (dir == NULL || dir[0] == '\0') | |
139 | dir = relocate (LIBDIR); | |
140 | ||
141 | /* Concatenate dir and base into freshly allocated file_name. */ | |
142 | { | |
143 | size_t dir_len = strlen (dir); | |
144 | size_t base_len = strlen (base); | |
145 | int add_slash = (dir_len > 0 && !ISSLASH (dir[dir_len - 1])); | |
146 | file_name = (char *) malloc (dir_len + add_slash + base_len + 1); | |
147 | if (file_name != NULL) | |
148 | { | |
149 | memcpy (file_name, dir, dir_len); | |
150 | if (add_slash) | |
151 | file_name[dir_len] = DIRECTORY_SEPARATOR; | |
152 | memcpy (file_name + dir_len + add_slash, base, base_len + 1); | |
153 | } | |
154 | } | |
155 | ||
156 | if (file_name == NULL) | |
157 | /* Out of memory. Treat the file as empty. */ | |
158 | cp = ""; | |
159 | else | |
160 | { | |
161 | int fd; | |
162 | ||
163 | /* Open the file. Reject symbolic links on platforms that support | |
164 | O_NOFOLLOW. This is a security feature. Without it, an attacker | |
165 | could retrieve parts of the contents (namely, the tail of the | |
166 | first line that starts with "* ") of an arbitrary file by placing | |
167 | a symbolic link to that file under the name "charset.alias" in | |
168 | some writable directory and defining the environment variable | |
169 | CHARSETALIASDIR to point to that directory. */ | |
170 | fd = open (file_name, | |
171 | O_RDONLY | (HAVE_WORKING_O_NOFOLLOW ? O_NOFOLLOW : 0)); | |
172 | if (fd < 0) | |
173 | /* File not found. Treat it as empty. */ | |
174 | cp = ""; | |
175 | else | |
176 | { | |
177 | FILE *fp; | |
178 | ||
179 | fp = fdopen (fd, "r"); | |
180 | if (fp == NULL) | |
181 | { | |
182 | /* Out of memory. Treat the file as empty. */ | |
183 | close (fd); | |
184 | cp = ""; | |
185 | } | |
186 | else | |
187 | { | |
188 | /* Parse the file's contents. */ | |
189 | char *res_ptr = NULL; | |
190 | size_t res_size = 0; | |
191 | ||
192 | for (;;) | |
193 | { | |
194 | int c; | |
195 | char buf1[50+1]; | |
196 | char buf2[50+1]; | |
197 | size_t l1, l2; | |
198 | char *old_res_ptr; | |
199 | ||
200 | c = getc (fp); | |
201 | if (c == EOF) | |
202 | break; | |
203 | if (c == '\n' || c == ' ' || c == '\t') | |
204 | continue; | |
205 | if (c == '#') | |
206 | { | |
207 | /* Skip comment, to end of line. */ | |
208 | do | |
209 | c = getc (fp); | |
210 | while (!(c == EOF || c == '\n')); | |
211 | if (c == EOF) | |
212 | break; | |
213 | continue; | |
214 | } | |
215 | ungetc (c, fp); | |
216 | if (fscanf (fp, "%50s %50s", buf1, buf2) < 2) | |
217 | break; | |
218 | l1 = strlen (buf1); | |
219 | l2 = strlen (buf2); | |
220 | old_res_ptr = res_ptr; | |
221 | if (res_size == 0) | |
222 | { | |
223 | res_size = l1 + 1 + l2 + 1; | |
224 | res_ptr = (char *) malloc (res_size + 1); | |
225 | } | |
226 | else | |
227 | { | |
228 | res_size += l1 + 1 + l2 + 1; | |
229 | res_ptr = (char *) realloc (res_ptr, res_size + 1); | |
230 | } | |
231 | if (res_ptr == NULL) | |
232 | { | |
233 | /* Out of memory. */ | |
234 | res_size = 0; | |
235 | free (old_res_ptr); | |
236 | break; | |
237 | } | |
238 | strcpy (res_ptr + res_size - (l2 + 1) - (l1 + 1), buf1); | |
239 | strcpy (res_ptr + res_size - (l2 + 1), buf2); | |
240 | } | |
241 | fclose (fp); | |
242 | if (res_size == 0) | |
243 | cp = ""; | |
244 | else | |
245 | { | |
246 | *(res_ptr + res_size) = '\0'; | |
247 | cp = res_ptr; | |
248 | } | |
249 | } | |
250 | } | |
251 | ||
252 | free (file_name); | |
253 | } | |
254 | ||
255 | #else | |
256 | ||
257 | # if defined DARWIN7 | |
258 | /* To avoid the trouble of installing a file that is shared by many | |
259 | GNU packages -- many packaging systems have problems with this --, | |
260 | simply inline the aliases here. */ | |
261 | cp = "ISO8859-1" "\0" "ISO-8859-1" "\0" | |
262 | "ISO8859-2" "\0" "ISO-8859-2" "\0" | |
263 | "ISO8859-4" "\0" "ISO-8859-4" "\0" | |
264 | "ISO8859-5" "\0" "ISO-8859-5" "\0" | |
265 | "ISO8859-7" "\0" "ISO-8859-7" "\0" | |
266 | "ISO8859-9" "\0" "ISO-8859-9" "\0" | |
267 | "ISO8859-13" "\0" "ISO-8859-13" "\0" | |
268 | "ISO8859-15" "\0" "ISO-8859-15" "\0" | |
269 | "KOI8-R" "\0" "KOI8-R" "\0" | |
270 | "KOI8-U" "\0" "KOI8-U" "\0" | |
271 | "CP866" "\0" "CP866" "\0" | |
272 | "CP949" "\0" "CP949" "\0" | |
273 | "CP1131" "\0" "CP1131" "\0" | |
274 | "CP1251" "\0" "CP1251" "\0" | |
275 | "eucCN" "\0" "GB2312" "\0" | |
276 | "GB2312" "\0" "GB2312" "\0" | |
277 | "eucJP" "\0" "EUC-JP" "\0" | |
278 | "eucKR" "\0" "EUC-KR" "\0" | |
279 | "Big5" "\0" "BIG5" "\0" | |
280 | "Big5HKSCS" "\0" "BIG5-HKSCS" "\0" | |
281 | "GBK" "\0" "GBK" "\0" | |
282 | "GB18030" "\0" "GB18030" "\0" | |
283 | "SJIS" "\0" "SHIFT_JIS" "\0" | |
284 | "ARMSCII-8" "\0" "ARMSCII-8" "\0" | |
285 | "PT154" "\0" "PT154" "\0" | |
286 | /*"ISCII-DEV" "\0" "?" "\0"*/ | |
287 | "*" "\0" "UTF-8" "\0"; | |
288 | # endif | |
289 | ||
290 | # if defined VMS | |
291 | /* To avoid the troubles of an extra file charset.alias_vms in the | |
292 | sources of many GNU packages, simply inline the aliases here. */ | |
293 | /* The list of encodings is taken from the OpenVMS 7.3-1 documentation | |
294 | "Compaq C Run-Time Library Reference Manual for OpenVMS systems" | |
295 | section 10.7 "Handling Different Character Sets". */ | |
296 | cp = "ISO8859-1" "\0" "ISO-8859-1" "\0" | |
297 | "ISO8859-2" "\0" "ISO-8859-2" "\0" | |
298 | "ISO8859-5" "\0" "ISO-8859-5" "\0" | |
299 | "ISO8859-7" "\0" "ISO-8859-7" "\0" | |
300 | "ISO8859-8" "\0" "ISO-8859-8" "\0" | |
301 | "ISO8859-9" "\0" "ISO-8859-9" "\0" | |
302 | /* Japanese */ | |
303 | "eucJP" "\0" "EUC-JP" "\0" | |
304 | "SJIS" "\0" "SHIFT_JIS" "\0" | |
305 | "DECKANJI" "\0" "DEC-KANJI" "\0" | |
306 | "SDECKANJI" "\0" "EUC-JP" "\0" | |
307 | /* Chinese */ | |
308 | "eucTW" "\0" "EUC-TW" "\0" | |
309 | "DECHANYU" "\0" "DEC-HANYU" "\0" | |
310 | "DECHANZI" "\0" "GB2312" "\0" | |
311 | /* Korean */ | |
312 | "DECKOREAN" "\0" "EUC-KR" "\0"; | |
313 | # endif | |
314 | ||
f0007cad | 315 | # if defined WINDOWS_NATIVE || defined __CYGWIN__ |
c2c2b5a4 LC |
316 | /* To avoid the troubles of installing a separate file in the same |
317 | directory as the DLL and of retrieving the DLL's directory at | |
318 | runtime, simply inline the aliases here. */ | |
319 | ||
320 | cp = "CP936" "\0" "GBK" "\0" | |
321 | "CP1361" "\0" "JOHAB" "\0" | |
322 | "CP20127" "\0" "ASCII" "\0" | |
323 | "CP20866" "\0" "KOI8-R" "\0" | |
324 | "CP20936" "\0" "GB2312" "\0" | |
325 | "CP21866" "\0" "KOI8-RU" "\0" | |
326 | "CP28591" "\0" "ISO-8859-1" "\0" | |
327 | "CP28592" "\0" "ISO-8859-2" "\0" | |
328 | "CP28593" "\0" "ISO-8859-3" "\0" | |
329 | "CP28594" "\0" "ISO-8859-4" "\0" | |
330 | "CP28595" "\0" "ISO-8859-5" "\0" | |
331 | "CP28596" "\0" "ISO-8859-6" "\0" | |
332 | "CP28597" "\0" "ISO-8859-7" "\0" | |
333 | "CP28598" "\0" "ISO-8859-8" "\0" | |
334 | "CP28599" "\0" "ISO-8859-9" "\0" | |
335 | "CP28605" "\0" "ISO-8859-15" "\0" | |
336 | "CP38598" "\0" "ISO-8859-8" "\0" | |
337 | "CP51932" "\0" "EUC-JP" "\0" | |
338 | "CP51936" "\0" "GB2312" "\0" | |
339 | "CP51949" "\0" "EUC-KR" "\0" | |
340 | "CP51950" "\0" "EUC-TW" "\0" | |
341 | "CP54936" "\0" "GB18030" "\0" | |
342 | "CP65001" "\0" "UTF-8" "\0"; | |
343 | # endif | |
344 | #endif | |
345 | ||
346 | charset_aliases = cp; | |
347 | } | |
348 | ||
349 | return cp; | |
350 | } | |
351 | ||
352 | /* Determine the current locale's character encoding, and canonicalize it | |
353 | into one of the canonical names listed in config.charset. | |
354 | The result must not be freed; it is statically allocated. | |
355 | If the canonical name cannot be determined, the result is a non-canonical | |
356 | name. */ | |
357 | ||
358 | #ifdef STATIC | |
359 | STATIC | |
360 | #endif | |
361 | const char * | |
362 | locale_charset (void) | |
363 | { | |
364 | const char *codeset; | |
365 | const char *aliases; | |
366 | ||
f0007cad | 367 | #if !(defined WINDOWS_NATIVE || defined OS2) |
c2c2b5a4 LC |
368 | |
369 | # if HAVE_LANGINFO_CODESET | |
370 | ||
371 | /* Most systems support nl_langinfo (CODESET) nowadays. */ | |
372 | codeset = nl_langinfo (CODESET); | |
373 | ||
374 | # ifdef __CYGWIN__ | |
375 | /* Cygwin < 1.7 does not have locales. nl_langinfo (CODESET) always | |
376 | returns "US-ASCII". Return the suffix of the locale name from the | |
377 | environment variables (if present) or the codepage as a number. */ | |
378 | if (codeset != NULL && strcmp (codeset, "US-ASCII") == 0) | |
379 | { | |
380 | const char *locale; | |
381 | static char buf[2 + 10 + 1]; | |
382 | ||
383 | locale = getenv ("LC_ALL"); | |
384 | if (locale == NULL || locale[0] == '\0') | |
385 | { | |
386 | locale = getenv ("LC_CTYPE"); | |
387 | if (locale == NULL || locale[0] == '\0') | |
388 | locale = getenv ("LANG"); | |
389 | } | |
390 | if (locale != NULL && locale[0] != '\0') | |
391 | { | |
392 | /* If the locale name contains an encoding after the dot, return | |
393 | it. */ | |
394 | const char *dot = strchr (locale, '.'); | |
395 | ||
396 | if (dot != NULL) | |
397 | { | |
398 | const char *modifier; | |
399 | ||
400 | dot++; | |
401 | /* Look for the possible @... trailer and remove it, if any. */ | |
402 | modifier = strchr (dot, '@'); | |
403 | if (modifier == NULL) | |
404 | return dot; | |
405 | if (modifier - dot < sizeof (buf)) | |
406 | { | |
407 | memcpy (buf, dot, modifier - dot); | |
408 | buf [modifier - dot] = '\0'; | |
409 | return buf; | |
410 | } | |
411 | } | |
412 | } | |
413 | ||
f0007cad LC |
414 | /* The Windows API has a function returning the locale's codepage as a |
415 | number: GetACP(). This encoding is used by Cygwin, unless the user | |
416 | has set the environment variable CYGWIN=codepage:oem (which very few | |
417 | people do). | |
c2c2b5a4 LC |
418 | Output directed to console windows needs to be converted (to |
419 | GetOEMCP() if the console is using a raster font, or to | |
420 | GetConsoleOutputCP() if it is using a TrueType font). Cygwin does | |
421 | this conversion transparently (see winsup/cygwin/fhandler_console.cc), | |
422 | converting to GetConsoleOutputCP(). This leads to correct results, | |
423 | except when SetConsoleOutputCP has been called and a raster font is | |
424 | in use. */ | |
425 | sprintf (buf, "CP%u", GetACP ()); | |
426 | codeset = buf; | |
427 | } | |
428 | # endif | |
429 | ||
430 | # else | |
431 | ||
432 | /* On old systems which lack it, use setlocale or getenv. */ | |
433 | const char *locale = NULL; | |
434 | ||
435 | /* But most old systems don't have a complete set of locales. Some | |
436 | (like SunOS 4 or DJGPP) have only the C locale. Therefore we don't | |
437 | use setlocale here; it would return "C" when it doesn't support the | |
438 | locale name the user has set. */ | |
439 | # if 0 | |
440 | locale = setlocale (LC_CTYPE, NULL); | |
441 | # endif | |
442 | if (locale == NULL || locale[0] == '\0') | |
443 | { | |
444 | locale = getenv ("LC_ALL"); | |
445 | if (locale == NULL || locale[0] == '\0') | |
446 | { | |
447 | locale = getenv ("LC_CTYPE"); | |
448 | if (locale == NULL || locale[0] == '\0') | |
449 | locale = getenv ("LANG"); | |
450 | } | |
451 | } | |
452 | ||
453 | /* On some old systems, one used to set locale = "iso8859_1". On others, | |
454 | you set it to "language_COUNTRY.charset". In any case, we resolve it | |
455 | through the charset.alias file. */ | |
456 | codeset = locale; | |
457 | ||
458 | # endif | |
459 | ||
f0007cad | 460 | #elif defined WINDOWS_NATIVE |
c2c2b5a4 LC |
461 | |
462 | static char buf[2 + 10 + 1]; | |
463 | ||
f0007cad LC |
464 | /* The Windows API has a function returning the locale's codepage as a |
465 | number: GetACP(). | |
c2c2b5a4 LC |
466 | When the output goes to a console window, it needs to be provided in |
467 | GetOEMCP() encoding if the console is using a raster font, or in | |
468 | GetConsoleOutputCP() encoding if it is using a TrueType font. | |
469 | But in GUI programs and for output sent to files and pipes, GetACP() | |
470 | encoding is the best bet. */ | |
471 | sprintf (buf, "CP%u", GetACP ()); | |
472 | codeset = buf; | |
473 | ||
474 | #elif defined OS2 | |
475 | ||
476 | const char *locale; | |
477 | static char buf[2 + 10 + 1]; | |
478 | ULONG cp[3]; | |
479 | ULONG cplen; | |
480 | ||
481 | /* Allow user to override the codeset, as set in the operating system, | |
482 | with standard language environment variables. */ | |
483 | locale = getenv ("LC_ALL"); | |
484 | if (locale == NULL || locale[0] == '\0') | |
485 | { | |
486 | locale = getenv ("LC_CTYPE"); | |
487 | if (locale == NULL || locale[0] == '\0') | |
488 | locale = getenv ("LANG"); | |
489 | } | |
490 | if (locale != NULL && locale[0] != '\0') | |
491 | { | |
492 | /* If the locale name contains an encoding after the dot, return it. */ | |
493 | const char *dot = strchr (locale, '.'); | |
494 | ||
495 | if (dot != NULL) | |
496 | { | |
497 | const char *modifier; | |
498 | ||
499 | dot++; | |
500 | /* Look for the possible @... trailer and remove it, if any. */ | |
501 | modifier = strchr (dot, '@'); | |
502 | if (modifier == NULL) | |
503 | return dot; | |
504 | if (modifier - dot < sizeof (buf)) | |
505 | { | |
506 | memcpy (buf, dot, modifier - dot); | |
507 | buf [modifier - dot] = '\0'; | |
508 | return buf; | |
509 | } | |
510 | } | |
511 | ||
512 | /* Resolve through the charset.alias file. */ | |
513 | codeset = locale; | |
514 | } | |
515 | else | |
516 | { | |
517 | /* OS/2 has a function returning the locale's codepage as a number. */ | |
518 | if (DosQueryCp (sizeof (cp), cp, &cplen)) | |
519 | codeset = ""; | |
520 | else | |
521 | { | |
522 | sprintf (buf, "CP%u", cp[0]); | |
523 | codeset = buf; | |
524 | } | |
525 | } | |
526 | ||
527 | #endif | |
528 | ||
529 | if (codeset == NULL) | |
530 | /* The canonical name cannot be determined. */ | |
531 | codeset = ""; | |
532 | ||
533 | /* Resolve alias. */ | |
534 | for (aliases = get_charset_aliases (); | |
535 | *aliases != '\0'; | |
536 | aliases += strlen (aliases) + 1, aliases += strlen (aliases) + 1) | |
537 | if (strcmp (codeset, aliases) == 0 | |
538 | || (aliases[0] == '*' && aliases[1] == '\0')) | |
539 | { | |
540 | codeset = aliases + strlen (aliases) + 1; | |
541 | break; | |
542 | } | |
543 | ||
544 | /* Don't return an empty string. GNU libc and GNU libiconv interpret | |
545 | the empty string as denoting "the locale's character encoding", | |
546 | thus GNU libiconv would call this function a second time. */ | |
547 | if (codeset[0] == '\0') | |
548 | codeset = "ASCII"; | |
549 | ||
7ae4e75a LC |
550 | #ifdef DARWIN7 |
551 | /* Mac OS X sets MB_CUR_MAX to 1 when LC_ALL=C, and "UTF-8" | |
552 | (the default codeset) does not work when MB_CUR_MAX is 1. */ | |
5e69ceb7 | 553 | if (strcmp (codeset, "UTF-8") == 0 && MB_CUR_MAX_L (uselocale (NULL)) <= 1) |
7ae4e75a LC |
554 | codeset = "ASCII"; |
555 | #endif | |
556 | ||
c2c2b5a4 LC |
557 | return codeset; |
558 | } | |
559 | ||
560 | /* A variant of the above, without calls to `setlocale', `nl_langinfo', | |
561 | etc. */ | |
562 | const char * | |
563 | environ_locale_charset (void) | |
564 | { | |
565 | static char buf[2 + 10 + 1]; | |
566 | const char *codeset, *aliases; | |
567 | const char *locale = NULL; | |
568 | ||
569 | locale = getenv ("LC_ALL"); | |
570 | if (locale == NULL || locale[0] == '\0') | |
571 | { | |
572 | locale = getenv ("LC_CTYPE"); | |
573 | if (locale == NULL || locale[0] == '\0') | |
574 | locale = getenv ("LANG"); | |
575 | } | |
576 | ||
577 | if (locale != NULL && locale[0] != '\0') | |
578 | { | |
579 | /* If the locale name contains an encoding after the dot, return it. */ | |
580 | const char *dot = strchr (locale, '.'); | |
581 | ||
582 | if (dot != NULL) | |
583 | { | |
584 | const char *modifier; | |
585 | ||
586 | dot++; | |
587 | /* Look for the possible @... trailer and remove it, if any. */ | |
588 | modifier = strchr (dot, '@'); | |
589 | if (modifier == NULL) | |
590 | return dot; | |
591 | if (modifier - dot < sizeof (buf)) | |
592 | { | |
593 | memcpy (buf, dot, modifier - dot); | |
594 | buf [modifier - dot] = '\0'; | |
595 | return buf; | |
596 | } | |
597 | } | |
598 | else if (strcmp (locale, "C") == 0) | |
599 | { | |
600 | strcpy (buf, "ASCII"); | |
601 | return buf; | |
602 | } | |
5de00531 LC |
603 | else |
604 | codeset = ""; | |
c2c2b5a4 LC |
605 | } |
606 | else | |
607 | codeset = ""; | |
608 | ||
609 | /* Resolve alias. */ | |
610 | for (aliases = get_charset_aliases (); | |
611 | *aliases != '\0'; | |
612 | aliases += strlen (aliases) + 1, aliases += strlen (aliases) + 1) | |
613 | if (strcmp (codeset, aliases) == 0 | |
614 | || (aliases[0] == '*' && aliases[1] == '\0')) | |
615 | { | |
616 | codeset = aliases + strlen (aliases) + 1; | |
617 | break; | |
618 | } | |
619 | ||
620 | /* Don't return an empty string. GNU libc and GNU libiconv interpret | |
621 | the empty string as denoting "the locale's character encoding", | |
622 | thus GNU libiconv would call this function a second time. */ | |
623 | if (codeset[0] == '\0') | |
5de00531 LC |
624 | /* Default to Latin-1, for backward compatibility with Guile 1.8. */ |
625 | codeset = "ISO-8859-1"; | |
c2c2b5a4 LC |
626 | |
627 | return codeset; | |
628 | } |