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8690e634 JK |
1 | /* Determine a canonical name for the current locale's character encoding. |
2 | ||
5e8754f9 | 3 | Copyright (C) 2000-2006, 2008-2016 Free Software Foundation, Inc. |
8690e634 JK |
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 | |
5e8754f9 | 16 | with this program; if not, see <http://www.gnu.org/licenses/>. */ |
8690e634 JK |
17 | |
18 | /* Written by Bruno Haible <bruno@clisp.org>. */ | |
19 | ||
20 | #include <config.h> | |
21 | ||
22 | /* Specification. */ | |
23 | #include "localcharset.h" | |
24 | ||
5e8754f9 | 25 | #include <fcntl.h> |
8690e634 JK |
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 | ||
5e8754f9 | 35 | #if defined _WIN32 || defined __WIN32__ |
8690e634 | 36 | # define WINDOWS_NATIVE |
4a626d0a | 37 | # include <locale.h> |
8690e634 JK |
38 | #endif |
39 | ||
40 | #if defined __EMX__ | |
41 | /* Assume EMX program runs on OS/2, even if compiled under DOS. */ | |
42 | # ifndef OS2 | |
43 | # define OS2 | |
44 | # endif | |
45 | #endif | |
46 | ||
47 | #if !defined WINDOWS_NATIVE | |
5e8754f9 | 48 | # include <unistd.h> |
8690e634 JK |
49 | # if HAVE_LANGINFO_CODESET |
50 | # include <langinfo.h> | |
51 | # else | |
5e8754f9 | 52 | # if 0 /* see comment below */ |
8690e634 JK |
53 | # include <locale.h> |
54 | # endif | |
55 | # endif | |
56 | # ifdef __CYGWIN__ | |
57 | # define WIN32_LEAN_AND_MEAN | |
58 | # include <windows.h> | |
59 | # endif | |
60 | #elif defined WINDOWS_NATIVE | |
61 | # define WIN32_LEAN_AND_MEAN | |
62 | # include <windows.h> | |
63 | #endif | |
64 | #if defined OS2 | |
65 | # define INCL_DOS | |
66 | # include <os2.h> | |
67 | #endif | |
68 | ||
4a626d0a PA |
69 | /* For MB_CUR_MAX_L */ |
70 | #if defined DARWIN7 | |
71 | # include <xlocale.h> | |
72 | #endif | |
73 | ||
5e8754f9 SDJ |
74 | #if ENABLE_RELOCATABLE |
75 | # include "relocatable.h" | |
76 | #else | |
77 | # define relocate(pathname) (pathname) | |
78 | #endif | |
79 | ||
80 | /* Get LIBDIR. */ | |
81 | #ifndef LIBDIR | |
82 | # include "configmake.h" | |
83 | #endif | |
84 | ||
85 | /* Define O_NOFOLLOW to 0 on platforms where it does not exist. */ | |
86 | #ifndef O_NOFOLLOW | |
87 | # define O_NOFOLLOW 0 | |
88 | #endif | |
89 | ||
90 | #if defined _WIN32 || defined __WIN32__ || defined __CYGWIN__ || defined __EMX__ || defined __DJGPP__ | |
91 | /* Native Windows, Cygwin, OS/2, DOS */ | |
92 | # define ISSLASH(C) ((C) == '/' || (C) == '\\') | |
93 | #endif | |
8690e634 | 94 | |
5e8754f9 SDJ |
95 | #ifndef DIRECTORY_SEPARATOR |
96 | # define DIRECTORY_SEPARATOR '/' | |
97 | #endif | |
8690e634 | 98 | |
5e8754f9 SDJ |
99 | #ifndef ISSLASH |
100 | # define ISSLASH(C) ((C) == DIRECTORY_SEPARATOR) | |
101 | #endif | |
8690e634 | 102 | |
5e8754f9 SDJ |
103 | #if HAVE_DECL_GETC_UNLOCKED |
104 | # undef getc | |
105 | # define getc getc_unlocked | |
106 | #endif | |
8690e634 | 107 | |
5e8754f9 SDJ |
108 | /* The following static variable is declared 'volatile' to avoid a |
109 | possible multithread problem in the function get_charset_aliases. If we | |
110 | are running in a threaded environment, and if two threads initialize | |
111 | 'charset_aliases' simultaneously, both will produce the same value, | |
112 | and everything will be ok if the two assignments to 'charset_aliases' | |
113 | are atomic. But I don't know what will happen if the two assignments mix. */ | |
114 | #if __STDC__ != 1 | |
115 | # define volatile /* empty */ | |
116 | #endif | |
117 | /* Pointer to the contents of the charset.alias file, if it has already been | |
118 | read, else NULL. Its format is: | |
119 | ALIAS_1 '\0' CANONICAL_1 '\0' ... ALIAS_n '\0' CANONICAL_n '\0' '\0' */ | |
120 | static const char * volatile charset_aliases; | |
121 | ||
122 | /* Return a pointer to the contents of the charset.alias file. */ | |
123 | static const char * | |
124 | get_charset_aliases (void) | |
8690e634 | 125 | { |
5e8754f9 | 126 | const char *cp; |
8690e634 | 127 | |
5e8754f9 SDJ |
128 | cp = charset_aliases; |
129 | if (cp == NULL) | |
130 | { | |
131 | #if !(defined DARWIN7 || defined VMS || defined WINDOWS_NATIVE || defined __CYGWIN__ || defined OS2) | |
132 | const char *dir; | |
133 | const char *base = "charset.alias"; | |
134 | char *file_name; | |
135 | ||
136 | /* Make it possible to override the charset.alias location. This is | |
137 | necessary for running the testsuite before "make install". */ | |
138 | dir = getenv ("CHARSETALIASDIR"); | |
139 | if (dir == NULL || dir[0] == '\0') | |
140 | dir = relocate (LIBDIR); | |
141 | ||
142 | /* Concatenate dir and base into freshly allocated file_name. */ | |
143 | { | |
144 | size_t dir_len = strlen (dir); | |
145 | size_t base_len = strlen (base); | |
146 | int add_slash = (dir_len > 0 && !ISSLASH (dir[dir_len - 1])); | |
147 | file_name = (char *) malloc (dir_len + add_slash + base_len + 1); | |
148 | if (file_name != NULL) | |
149 | { | |
150 | memcpy (file_name, dir, dir_len); | |
151 | if (add_slash) | |
152 | file_name[dir_len] = DIRECTORY_SEPARATOR; | |
153 | memcpy (file_name + dir_len + add_slash, base, base_len + 1); | |
154 | } | |
155 | } | |
156 | ||
157 | if (file_name == NULL) | |
158 | /* Out of memory. Treat the file as empty. */ | |
159 | cp = ""; | |
160 | else | |
161 | { | |
162 | int fd; | |
163 | ||
164 | /* Open the file. Reject symbolic links on platforms that support | |
165 | O_NOFOLLOW. This is a security feature. Without it, an attacker | |
166 | could retrieve parts of the contents (namely, the tail of the | |
167 | first line that starts with "* ") of an arbitrary file by placing | |
168 | a symbolic link to that file under the name "charset.alias" in | |
169 | some writable directory and defining the environment variable | |
170 | CHARSETALIASDIR to point to that directory. */ | |
171 | fd = open (file_name, | |
172 | O_RDONLY | (HAVE_WORKING_O_NOFOLLOW ? O_NOFOLLOW : 0)); | |
173 | if (fd < 0) | |
174 | /* File not found. Treat it as empty. */ | |
175 | cp = ""; | |
176 | else | |
177 | { | |
178 | FILE *fp; | |
179 | ||
180 | fp = fdopen (fd, "r"); | |
181 | if (fp == NULL) | |
182 | { | |
183 | /* Out of memory. Treat the file as empty. */ | |
184 | close (fd); | |
185 | cp = ""; | |
186 | } | |
187 | else | |
188 | { | |
189 | /* Parse the file's contents. */ | |
190 | char *res_ptr = NULL; | |
191 | size_t res_size = 0; | |
192 | ||
193 | for (;;) | |
194 | { | |
195 | int c; | |
196 | char buf1[50+1]; | |
197 | char buf2[50+1]; | |
198 | size_t l1, l2; | |
199 | char *old_res_ptr; | |
200 | ||
201 | c = getc (fp); | |
202 | if (c == EOF) | |
203 | break; | |
204 | if (c == '\n' || c == ' ' || c == '\t') | |
205 | continue; | |
206 | if (c == '#') | |
207 | { | |
208 | /* Skip comment, to end of line. */ | |
209 | do | |
210 | c = getc (fp); | |
211 | while (!(c == EOF || c == '\n')); | |
212 | if (c == EOF) | |
213 | break; | |
214 | continue; | |
215 | } | |
216 | ungetc (c, fp); | |
217 | if (fscanf (fp, "%50s %50s", buf1, buf2) < 2) | |
218 | break; | |
219 | l1 = strlen (buf1); | |
220 | l2 = strlen (buf2); | |
221 | old_res_ptr = res_ptr; | |
222 | if (res_size == 0) | |
223 | { | |
224 | res_size = l1 + 1 + l2 + 1; | |
225 | res_ptr = (char *) malloc (res_size + 1); | |
226 | } | |
227 | else | |
228 | { | |
229 | res_size += l1 + 1 + l2 + 1; | |
230 | res_ptr = (char *) realloc (res_ptr, res_size + 1); | |
231 | } | |
232 | if (res_ptr == NULL) | |
233 | { | |
234 | /* Out of memory. */ | |
235 | res_size = 0; | |
236 | free (old_res_ptr); | |
237 | break; | |
238 | } | |
239 | strcpy (res_ptr + res_size - (l2 + 1) - (l1 + 1), buf1); | |
240 | strcpy (res_ptr + res_size - (l2 + 1), buf2); | |
241 | } | |
242 | fclose (fp); | |
243 | if (res_size == 0) | |
244 | cp = ""; | |
245 | else | |
246 | { | |
247 | *(res_ptr + res_size) = '\0'; | |
248 | cp = res_ptr; | |
249 | } | |
250 | } | |
251 | } | |
252 | ||
253 | free (file_name); | |
254 | } | |
8690e634 JK |
255 | |
256 | #else | |
257 | ||
5e8754f9 SDJ |
258 | # if defined DARWIN7 |
259 | /* To avoid the trouble of installing a file that is shared by many | |
260 | GNU packages -- many packaging systems have problems with this --, | |
261 | simply inline the aliases here. */ | |
262 | cp = "ISO8859-1" "\0" "ISO-8859-1" "\0" | |
263 | "ISO8859-2" "\0" "ISO-8859-2" "\0" | |
264 | "ISO8859-4" "\0" "ISO-8859-4" "\0" | |
265 | "ISO8859-5" "\0" "ISO-8859-5" "\0" | |
266 | "ISO8859-7" "\0" "ISO-8859-7" "\0" | |
267 | "ISO8859-9" "\0" "ISO-8859-9" "\0" | |
268 | "ISO8859-13" "\0" "ISO-8859-13" "\0" | |
269 | "ISO8859-15" "\0" "ISO-8859-15" "\0" | |
270 | "KOI8-R" "\0" "KOI8-R" "\0" | |
271 | "KOI8-U" "\0" "KOI8-U" "\0" | |
272 | "CP866" "\0" "CP866" "\0" | |
273 | "CP949" "\0" "CP949" "\0" | |
274 | "CP1131" "\0" "CP1131" "\0" | |
275 | "CP1251" "\0" "CP1251" "\0" | |
276 | "eucCN" "\0" "GB2312" "\0" | |
277 | "GB2312" "\0" "GB2312" "\0" | |
278 | "eucJP" "\0" "EUC-JP" "\0" | |
279 | "eucKR" "\0" "EUC-KR" "\0" | |
280 | "Big5" "\0" "BIG5" "\0" | |
281 | "Big5HKSCS" "\0" "BIG5-HKSCS" "\0" | |
282 | "GBK" "\0" "GBK" "\0" | |
283 | "GB18030" "\0" "GB18030" "\0" | |
284 | "SJIS" "\0" "SHIFT_JIS" "\0" | |
285 | "ARMSCII-8" "\0" "ARMSCII-8" "\0" | |
286 | "PT154" "\0" "PT154" "\0" | |
287 | /*"ISCII-DEV" "\0" "?" "\0"*/ | |
288 | "*" "\0" "UTF-8" "\0"; | |
289 | # endif | |
8690e634 | 290 | |
5e8754f9 SDJ |
291 | # if defined VMS |
292 | /* To avoid the troubles of an extra file charset.alias_vms in the | |
293 | sources of many GNU packages, simply inline the aliases here. */ | |
294 | /* The list of encodings is taken from the OpenVMS 7.3-1 documentation | |
295 | "Compaq C Run-Time Library Reference Manual for OpenVMS systems" | |
296 | section 10.7 "Handling Different Character Sets". */ | |
297 | cp = "ISO8859-1" "\0" "ISO-8859-1" "\0" | |
298 | "ISO8859-2" "\0" "ISO-8859-2" "\0" | |
299 | "ISO8859-5" "\0" "ISO-8859-5" "\0" | |
300 | "ISO8859-7" "\0" "ISO-8859-7" "\0" | |
301 | "ISO8859-8" "\0" "ISO-8859-8" "\0" | |
302 | "ISO8859-9" "\0" "ISO-8859-9" "\0" | |
303 | /* Japanese */ | |
304 | "eucJP" "\0" "EUC-JP" "\0" | |
305 | "SJIS" "\0" "SHIFT_JIS" "\0" | |
306 | "DECKANJI" "\0" "DEC-KANJI" "\0" | |
307 | "SDECKANJI" "\0" "EUC-JP" "\0" | |
308 | /* Chinese */ | |
309 | "eucTW" "\0" "EUC-TW" "\0" | |
310 | "DECHANYU" "\0" "DEC-HANYU" "\0" | |
311 | "DECHANZI" "\0" "GB2312" "\0" | |
312 | /* Korean */ | |
313 | "DECKOREAN" "\0" "EUC-KR" "\0"; | |
8690e634 | 314 | # endif |
5e8754f9 SDJ |
315 | |
316 | # if defined WINDOWS_NATIVE || defined __CYGWIN__ | |
317 | /* To avoid the troubles of installing a separate file in the same | |
318 | directory as the DLL and of retrieving the DLL's directory at | |
319 | runtime, simply inline the aliases here. */ | |
320 | ||
321 | cp = "CP936" "\0" "GBK" "\0" | |
322 | "CP1361" "\0" "JOHAB" "\0" | |
323 | "CP20127" "\0" "ASCII" "\0" | |
324 | "CP20866" "\0" "KOI8-R" "\0" | |
325 | "CP20936" "\0" "GB2312" "\0" | |
326 | "CP21866" "\0" "KOI8-RU" "\0" | |
327 | "CP28591" "\0" "ISO-8859-1" "\0" | |
328 | "CP28592" "\0" "ISO-8859-2" "\0" | |
329 | "CP28593" "\0" "ISO-8859-3" "\0" | |
330 | "CP28594" "\0" "ISO-8859-4" "\0" | |
331 | "CP28595" "\0" "ISO-8859-5" "\0" | |
332 | "CP28596" "\0" "ISO-8859-6" "\0" | |
333 | "CP28597" "\0" "ISO-8859-7" "\0" | |
334 | "CP28598" "\0" "ISO-8859-8" "\0" | |
335 | "CP28599" "\0" "ISO-8859-9" "\0" | |
336 | "CP28605" "\0" "ISO-8859-15" "\0" | |
337 | "CP38598" "\0" "ISO-8859-8" "\0" | |
338 | "CP51932" "\0" "EUC-JP" "\0" | |
339 | "CP51936" "\0" "GB2312" "\0" | |
340 | "CP51949" "\0" "EUC-KR" "\0" | |
341 | "CP51950" "\0" "EUC-TW" "\0" | |
342 | "CP54936" "\0" "GB18030" "\0" | |
343 | "CP65001" "\0" "UTF-8" "\0"; | |
8690e634 | 344 | # endif |
5e8754f9 SDJ |
345 | # if defined OS2 |
346 | /* To avoid the troubles of installing a separate file in the same | |
347 | directory as the DLL and of retrieving the DLL's directory at | |
348 | runtime, simply inline the aliases here. */ | |
349 | ||
350 | /* The list of encodings is taken from "List of OS/2 Codepages" | |
351 | by Alex Taylor: | |
352 | <http://altsan.org/os2/toolkits/uls/index.html#codepages>. | |
353 | See also "IBM Globalization - Code page identifiers": | |
354 | <http://www-01.ibm.com/software/globalization/cp/cp_cpgid.html>. */ | |
355 | cp = "CP813" "\0" "ISO-8859-7" "\0" | |
356 | "CP878" "\0" "KOI8-R" "\0" | |
357 | "CP819" "\0" "ISO-8859-1" "\0" | |
358 | "CP912" "\0" "ISO-8859-2" "\0" | |
359 | "CP913" "\0" "ISO-8859-3" "\0" | |
360 | "CP914" "\0" "ISO-8859-4" "\0" | |
361 | "CP915" "\0" "ISO-8859-5" "\0" | |
362 | "CP916" "\0" "ISO-8859-8" "\0" | |
363 | "CP920" "\0" "ISO-8859-9" "\0" | |
364 | "CP921" "\0" "ISO-8859-13" "\0" | |
365 | "CP923" "\0" "ISO-8859-15" "\0" | |
366 | "CP954" "\0" "EUC-JP" "\0" | |
367 | "CP964" "\0" "EUC-TW" "\0" | |
368 | "CP970" "\0" "EUC-KR" "\0" | |
369 | "CP1089" "\0" "ISO-8859-6" "\0" | |
370 | "CP1208" "\0" "UTF-8" "\0" | |
371 | "CP1381" "\0" "GB2312" "\0" | |
372 | "CP1386" "\0" "GBK" "\0" | |
373 | "CP3372" "\0" "EUC-JP" "\0"; | |
4a626d0a | 374 | # endif |
7a6dbc2f | 375 | #endif |
8690e634 | 376 | |
5e8754f9 SDJ |
377 | charset_aliases = cp; |
378 | } | |
379 | ||
380 | return cp; | |
381 | } | |
8690e634 JK |
382 | |
383 | /* Determine the current locale's character encoding, and canonicalize it | |
5e8754f9 | 384 | into one of the canonical names listed in config.charset. |
8690e634 JK |
385 | The result must not be freed; it is statically allocated. |
386 | If the canonical name cannot be determined, the result is a non-canonical | |
387 | name. */ | |
388 | ||
389 | #ifdef STATIC | |
390 | STATIC | |
391 | #endif | |
392 | const char * | |
393 | locale_charset (void) | |
394 | { | |
395 | const char *codeset; | |
5e8754f9 | 396 | const char *aliases; |
8690e634 | 397 | |
5e8754f9 | 398 | #if !(defined WINDOWS_NATIVE || defined OS2) |
8690e634 JK |
399 | |
400 | # if HAVE_LANGINFO_CODESET | |
401 | ||
402 | /* Most systems support nl_langinfo (CODESET) nowadays. */ | |
403 | codeset = nl_langinfo (CODESET); | |
404 | ||
405 | # ifdef __CYGWIN__ | |
406 | /* Cygwin < 1.7 does not have locales. nl_langinfo (CODESET) always | |
407 | returns "US-ASCII". Return the suffix of the locale name from the | |
408 | environment variables (if present) or the codepage as a number. */ | |
409 | if (codeset != NULL && strcmp (codeset, "US-ASCII") == 0) | |
410 | { | |
411 | const char *locale; | |
412 | static char buf[2 + 10 + 1]; | |
413 | ||
414 | locale = getenv ("LC_ALL"); | |
415 | if (locale == NULL || locale[0] == '\0') | |
416 | { | |
417 | locale = getenv ("LC_CTYPE"); | |
418 | if (locale == NULL || locale[0] == '\0') | |
419 | locale = getenv ("LANG"); | |
420 | } | |
421 | if (locale != NULL && locale[0] != '\0') | |
422 | { | |
423 | /* If the locale name contains an encoding after the dot, return | |
424 | it. */ | |
425 | const char *dot = strchr (locale, '.'); | |
426 | ||
427 | if (dot != NULL) | |
428 | { | |
429 | const char *modifier; | |
430 | ||
431 | dot++; | |
432 | /* Look for the possible @... trailer and remove it, if any. */ | |
433 | modifier = strchr (dot, '@'); | |
434 | if (modifier == NULL) | |
435 | return dot; | |
436 | if (modifier - dot < sizeof (buf)) | |
437 | { | |
438 | memcpy (buf, dot, modifier - dot); | |
439 | buf [modifier - dot] = '\0'; | |
440 | return buf; | |
441 | } | |
442 | } | |
443 | } | |
444 | ||
445 | /* The Windows API has a function returning the locale's codepage as a | |
446 | number: GetACP(). This encoding is used by Cygwin, unless the user | |
447 | has set the environment variable CYGWIN=codepage:oem (which very few | |
448 | people do). | |
449 | Output directed to console windows needs to be converted (to | |
450 | GetOEMCP() if the console is using a raster font, or to | |
451 | GetConsoleOutputCP() if it is using a TrueType font). Cygwin does | |
452 | this conversion transparently (see winsup/cygwin/fhandler_console.cc), | |
453 | converting to GetConsoleOutputCP(). This leads to correct results, | |
454 | except when SetConsoleOutputCP has been called and a raster font is | |
455 | in use. */ | |
456 | sprintf (buf, "CP%u", GetACP ()); | |
457 | codeset = buf; | |
458 | } | |
459 | # endif | |
460 | ||
5e8754f9 SDJ |
461 | # else |
462 | ||
463 | /* On old systems which lack it, use setlocale or getenv. */ | |
464 | const char *locale = NULL; | |
465 | ||
466 | /* But most old systems don't have a complete set of locales. Some | |
467 | (like SunOS 4 or DJGPP) have only the C locale. Therefore we don't | |
468 | use setlocale here; it would return "C" when it doesn't support the | |
469 | locale name the user has set. */ | |
470 | # if 0 | |
471 | locale = setlocale (LC_CTYPE, NULL); | |
472 | # endif | |
473 | if (locale == NULL || locale[0] == '\0') | |
474 | { | |
475 | locale = getenv ("LC_ALL"); | |
476 | if (locale == NULL || locale[0] == '\0') | |
477 | { | |
478 | locale = getenv ("LC_CTYPE"); | |
479 | if (locale == NULL || locale[0] == '\0') | |
480 | locale = getenv ("LANG"); | |
481 | } | |
482 | } | |
483 | ||
484 | /* On some old systems, one used to set locale = "iso8859_1". On others, | |
485 | you set it to "language_COUNTRY.charset". In any case, we resolve it | |
486 | through the charset.alias file. */ | |
487 | codeset = locale; | |
8690e634 | 488 | |
5e8754f9 SDJ |
489 | # endif |
490 | ||
491 | #elif defined WINDOWS_NATIVE | |
8690e634 JK |
492 | |
493 | static char buf[2 + 10 + 1]; | |
494 | ||
4a626d0a PA |
495 | /* The Windows API has a function returning the locale's codepage as |
496 | a number, but the value doesn't change according to what the | |
497 | 'setlocale' call specified. So we use it as a last resort, in | |
498 | case the string returned by 'setlocale' doesn't specify the | |
499 | codepage. */ | |
500 | char *current_locale = setlocale (LC_ALL, NULL); | |
501 | char *pdot; | |
502 | ||
503 | /* If they set different locales for different categories, | |
504 | 'setlocale' will return a semi-colon separated list of locale | |
505 | values. To make sure we use the correct one, we choose LC_CTYPE. */ | |
506 | if (strchr (current_locale, ';')) | |
507 | current_locale = setlocale (LC_CTYPE, NULL); | |
508 | ||
509 | pdot = strrchr (current_locale, '.'); | |
5e8754f9 | 510 | if (pdot) |
4a626d0a PA |
511 | sprintf (buf, "CP%s", pdot + 1); |
512 | else | |
513 | { | |
514 | /* The Windows API has a function returning the locale's codepage as a | |
515 | number: GetACP(). | |
516 | When the output goes to a console window, it needs to be provided in | |
517 | GetOEMCP() encoding if the console is using a raster font, or in | |
518 | GetConsoleOutputCP() encoding if it is using a TrueType font. | |
519 | But in GUI programs and for output sent to files and pipes, GetACP() | |
520 | encoding is the best bet. */ | |
521 | sprintf (buf, "CP%u", GetACP ()); | |
522 | } | |
8690e634 JK |
523 | codeset = buf; |
524 | ||
5e8754f9 | 525 | #elif defined OS2 |
8690e634 JK |
526 | |
527 | const char *locale; | |
528 | static char buf[2 + 10 + 1]; | |
529 | ULONG cp[3]; | |
530 | ULONG cplen; | |
531 | ||
4a626d0a PA |
532 | codeset = NULL; |
533 | ||
8690e634 JK |
534 | /* Allow user to override the codeset, as set in the operating system, |
535 | with standard language environment variables. */ | |
536 | locale = getenv ("LC_ALL"); | |
537 | if (locale == NULL || locale[0] == '\0') | |
538 | { | |
539 | locale = getenv ("LC_CTYPE"); | |
540 | if (locale == NULL || locale[0] == '\0') | |
541 | locale = getenv ("LANG"); | |
542 | } | |
543 | if (locale != NULL && locale[0] != '\0') | |
544 | { | |
545 | /* If the locale name contains an encoding after the dot, return it. */ | |
546 | const char *dot = strchr (locale, '.'); | |
547 | ||
548 | if (dot != NULL) | |
549 | { | |
550 | const char *modifier; | |
551 | ||
552 | dot++; | |
553 | /* Look for the possible @... trailer and remove it, if any. */ | |
554 | modifier = strchr (dot, '@'); | |
555 | if (modifier == NULL) | |
556 | return dot; | |
557 | if (modifier - dot < sizeof (buf)) | |
558 | { | |
559 | memcpy (buf, dot, modifier - dot); | |
560 | buf [modifier - dot] = '\0'; | |
561 | return buf; | |
562 | } | |
563 | } | |
564 | ||
4a626d0a PA |
565 | /* For the POSIX locale, don't use the system's codepage. */ |
566 | if (strcmp (locale, "C") == 0 || strcmp (locale, "POSIX") == 0) | |
567 | codeset = ""; | |
8690e634 | 568 | } |
4a626d0a PA |
569 | |
570 | if (codeset == NULL) | |
8690e634 JK |
571 | { |
572 | /* OS/2 has a function returning the locale's codepage as a number. */ | |
573 | if (DosQueryCp (sizeof (cp), cp, &cplen)) | |
574 | codeset = ""; | |
575 | else | |
576 | { | |
577 | sprintf (buf, "CP%u", cp[0]); | |
578 | codeset = buf; | |
579 | } | |
580 | } | |
581 | ||
5e8754f9 | 582 | #endif |
7a6dbc2f | 583 | |
5e8754f9 SDJ |
584 | if (codeset == NULL) |
585 | /* The canonical name cannot be determined. */ | |
586 | codeset = ""; | |
7a6dbc2f | 587 | |
5e8754f9 SDJ |
588 | /* Resolve alias. */ |
589 | for (aliases = get_charset_aliases (); | |
590 | *aliases != '\0'; | |
591 | aliases += strlen (aliases) + 1, aliases += strlen (aliases) + 1) | |
592 | if (strcmp (codeset, aliases) == 0 | |
593 | || (aliases[0] == '*' && aliases[1] == '\0')) | |
7a6dbc2f | 594 | { |
5e8754f9 SDJ |
595 | codeset = aliases + strlen (aliases) + 1; |
596 | break; | |
7a6dbc2f | 597 | } |
7a6dbc2f | 598 | |
5e8754f9 SDJ |
599 | /* Don't return an empty string. GNU libc and GNU libiconv interpret |
600 | the empty string as denoting "the locale's character encoding", | |
601 | thus GNU libiconv would call this function a second time. */ | |
602 | if (codeset[0] == '\0') | |
603 | codeset = "ASCII"; | |
8690e634 | 604 | |
a512b375 JB |
605 | #ifdef DARWIN7 |
606 | /* Mac OS X sets MB_CUR_MAX to 1 when LC_ALL=C, and "UTF-8" | |
607 | (the default codeset) does not work when MB_CUR_MAX is 1. */ | |
4a626d0a | 608 | if (strcmp (codeset, "UTF-8") == 0 && MB_CUR_MAX_L (uselocale (NULL)) <= 1) |
a512b375 JB |
609 | codeset = "ASCII"; |
610 | #endif | |
611 | ||
8690e634 JK |
612 | return codeset; |
613 | } |