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[/] [openrisc/] [trunk/] [gnu-src/] [gcc-4.2.2/] [intl/] [localcharset.c] - Blame information for rev 301

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1 38 julius
/* Determine a canonical name for the current locale's character encoding.
2
 
3
   Copyright (C) 2000-2003 Free Software Foundation, Inc.
4
 
5
   This program is free software; you can redistribute it and/or modify it
6
   under the terms of the GNU Library General Public License as published
7
   by the Free Software Foundation; either version 2, or (at your option)
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   any later version.
9
 
10
   This program is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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   Library General Public License for more details.
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15
   You should have received a copy of the GNU Library General Public
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   License along with this program; if not, write to the Free Software
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   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301,
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   USA.  */
19
 
20
/* Written by Bruno Haible <bruno@clisp.org>.  */
21
 
22
#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
25
 
26
/* Specification.  */
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#include "localcharset.h"
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29
#if HAVE_STDDEF_H
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# include <stddef.h>
31
#endif
32
 
33
#include <stdio.h>
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#if HAVE_STRING_H
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# include <string.h>
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#else
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# include <strings.h>
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#endif
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#if HAVE_STDLIB_H
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# include <stdlib.h>
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#endif
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43
#if defined _WIN32 || defined __WIN32__
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# undef WIN32   /* avoid warning on mingw32 */
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# define WIN32
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#endif
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#if defined __EMX__
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/* Assume EMX program runs on OS/2, even if compiled under DOS.  */
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# define OS2
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#endif
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#if !defined WIN32
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# if HAVE_LANGINFO_CODESET
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#  include <langinfo.h>
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# else
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#  if HAVE_SETLOCALE
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#   include <locale.h>
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#  endif
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# endif
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#elif defined WIN32
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# define WIN32_LEAN_AND_MEAN
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# include <windows.h>
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#endif
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#if defined OS2
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# define INCL_DOS
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# include <os2.h>
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#endif
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70
#if ENABLE_RELOCATABLE
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# include "relocatable.h"
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#else
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# define relocate(pathname) (pathname)
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#endif
75
 
76
#if defined _WIN32 || defined __WIN32__ || defined __EMX__ || defined __DJGPP__
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  /* Win32, OS/2, DOS */
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# define ISSLASH(C) ((C) == '/' || (C) == '\\')
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#endif
80
 
81
#ifndef DIRECTORY_SEPARATOR
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# define DIRECTORY_SEPARATOR '/'
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#endif
84
 
85
#ifndef ISSLASH
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# define ISSLASH(C) ((C) == DIRECTORY_SEPARATOR)
87
#endif
88
 
89
#ifdef HAVE_GETC_UNLOCKED
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# undef getc
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# define getc getc_unlocked
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#endif
93
 
94
/* The following static variable is declared 'volatile' to avoid a
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   possible multithread problem in the function get_charset_aliases. If we
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   are running in a threaded environment, and if two threads initialize
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   'charset_aliases' simultaneously, both will produce the same value,
98
   and everything will be ok if the two assignments to 'charset_aliases'
99
   are atomic. But I don't know what will happen if the two assignments mix.  */
100
#if __STDC__ != 1
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# define volatile /* empty */
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#endif
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/* Pointer to the contents of the charset.alias file, if it has already been
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   read, else NULL.  Its format is:
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   ALIAS_1 '\0' CANONICAL_1 '\0' ... ALIAS_n '\0' CANONICAL_n '\0' '\0'  */
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static const char * volatile charset_aliases;
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108
/* Return a pointer to the contents of the charset.alias file.  */
109
static const char *
110
get_charset_aliases ()
111
{
112
  const char *cp;
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114
  cp = charset_aliases;
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  if (cp == NULL)
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    {
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#if !(defined VMS || defined WIN32)
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      FILE *fp;
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      const char *dir = relocate (LIBDIR);
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      const char *base = "charset.alias";
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      char *file_name;
122
 
123
      /* Concatenate dir and base into freshly allocated file_name.  */
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      {
125
        size_t dir_len = strlen (dir);
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        size_t base_len = strlen (base);
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        int add_slash = (dir_len > 0 && !ISSLASH (dir[dir_len - 1]));
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        file_name = (char *) malloc (dir_len + add_slash + base_len + 1);
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        if (file_name != NULL)
130
          {
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            memcpy (file_name, dir, dir_len);
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            if (add_slash)
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              file_name[dir_len] = DIRECTORY_SEPARATOR;
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            memcpy (file_name + dir_len + add_slash, base, base_len + 1);
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          }
136
      }
137
 
138
      if (file_name == NULL || (fp = fopen (file_name, "r")) == NULL)
139
        /* Out of memory or file not found, treat it as empty.  */
140
        cp = "";
141
      else
142
        {
143
          /* Parse the file's contents.  */
144
          int c;
145
          char buf1[50+1];
146
          char buf2[50+1];
147
          char *res_ptr = NULL;
148
          size_t res_size = 0;
149
          size_t l1, l2;
150
 
151
          for (;;)
152
            {
153
              c = getc (fp);
154
              if (c == EOF)
155
                break;
156
              if (c == '\n' || c == ' ' || c == '\t')
157
                continue;
158
              if (c == '#')
159
                {
160
                  /* Skip comment, to end of line.  */
161
                  do
162
                    c = getc (fp);
163
                  while (!(c == EOF || c == '\n'));
164
                  if (c == EOF)
165
                    break;
166
                  continue;
167
                }
168
              ungetc (c, fp);
169
              if (fscanf (fp, "%50s %50s", buf1, buf2) < 2)
170
                break;
171
              l1 = strlen (buf1);
172
              l2 = strlen (buf2);
173
              if (res_size == 0)
174
                {
175
                  res_size = l1 + 1 + l2 + 1;
176
                  res_ptr = (char *) malloc (res_size + 1);
177
                }
178
              else
179
                {
180
                  res_size += l1 + 1 + l2 + 1;
181
                  res_ptr = (char *) realloc (res_ptr, res_size + 1);
182
                }
183
              if (res_ptr == NULL)
184
                {
185
                  /* Out of memory. */
186
                  res_size = 0;
187
                  break;
188
                }
189
              strcpy (res_ptr + res_size - (l2 + 1) - (l1 + 1), buf1);
190
              strcpy (res_ptr + res_size - (l2 + 1), buf2);
191
            }
192
          fclose (fp);
193
          if (res_size == 0)
194
            cp = "";
195
          else
196
            {
197
              *(res_ptr + res_size) = '\0';
198
              cp = res_ptr;
199
            }
200
        }
201
 
202
      if (file_name != NULL)
203
        free (file_name);
204
 
205
#else
206
 
207
# if defined VMS
208
      /* To avoid the troubles of an extra file charset.alias_vms in the
209
         sources of many GNU packages, simply inline the aliases here.  */
210
      /* The list of encodings is taken from the OpenVMS 7.3-1 documentation
211
         "Compaq C Run-Time Library Reference Manual for OpenVMS systems"
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         section 10.7 "Handling Different Character Sets".  */
213
      cp = "ISO8859-1" "\0" "ISO-8859-1" "\0"
214
           "ISO8859-2" "\0" "ISO-8859-2" "\0"
215
           "ISO8859-5" "\0" "ISO-8859-5" "\0"
216
           "ISO8859-7" "\0" "ISO-8859-7" "\0"
217
           "ISO8859-8" "\0" "ISO-8859-8" "\0"
218
           "ISO8859-9" "\0" "ISO-8859-9" "\0"
219
           /* Japanese */
220
           "eucJP" "\0" "EUC-JP" "\0"
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           "SJIS" "\0" "SHIFT_JIS" "\0"
222
           "DECKANJI" "\0" "DEC-KANJI" "\0"
223
           "SDECKANJI" "\0" "EUC-JP" "\0"
224
           /* Chinese */
225
           "eucTW" "\0" "EUC-TW" "\0"
226
           "DECHANYU" "\0" "DEC-HANYU" "\0"
227
           "DECHANZI" "\0" "GB2312" "\0"
228
           /* Korean */
229
           "DECKOREAN" "\0" "EUC-KR" "\0";
230
# endif
231
 
232
# if defined WIN32
233
      /* To avoid the troubles of installing a separate file in the same
234
         directory as the DLL and of retrieving the DLL's directory at
235
         runtime, simply inline the aliases here.  */
236
 
237
      cp = "CP936" "\0" "GBK" "\0"
238
           "CP1361" "\0" "JOHAB" "\0"
239
           "CP20127" "\0" "ASCII" "\0"
240
           "CP20866" "\0" "KOI8-R" "\0"
241
           "CP21866" "\0" "KOI8-RU" "\0"
242
           "CP28591" "\0" "ISO-8859-1" "\0"
243
           "CP28592" "\0" "ISO-8859-2" "\0"
244
           "CP28593" "\0" "ISO-8859-3" "\0"
245
           "CP28594" "\0" "ISO-8859-4" "\0"
246
           "CP28595" "\0" "ISO-8859-5" "\0"
247
           "CP28596" "\0" "ISO-8859-6" "\0"
248
           "CP28597" "\0" "ISO-8859-7" "\0"
249
           "CP28598" "\0" "ISO-8859-8" "\0"
250
           "CP28599" "\0" "ISO-8859-9" "\0"
251
           "CP28605" "\0" "ISO-8859-15" "\0";
252
# endif
253
#endif
254
 
255
      charset_aliases = cp;
256
    }
257
 
258
  return cp;
259
}
260
 
261
/* Determine the current locale's character encoding, and canonicalize it
262
   into one of the canonical names listed in config.charset.
263
   The result must not be freed; it is statically allocated.
264
   If the canonical name cannot be determined, the result is a non-canonical
265
   name.  */
266
 
267
#ifdef STATIC
268
STATIC
269
#endif
270
const char *
271
locale_charset ()
272
{
273
  const char *codeset;
274
  const char *aliases;
275
 
276
#if !(defined WIN32 || defined OS2)
277
 
278
# if HAVE_LANGINFO_CODESET
279
 
280
  /* Most systems support nl_langinfo (CODESET) nowadays.  */
281
  codeset = nl_langinfo (CODESET);
282
 
283
# else
284
 
285
  /* On old systems which lack it, use setlocale or getenv.  */
286
  const char *locale = NULL;
287
 
288
  /* But most old systems don't have a complete set of locales.  Some
289
     (like SunOS 4 or DJGPP) have only the C locale.  Therefore we don't
290
     use setlocale here; it would return "C" when it doesn't support the
291
     locale name the user has set.  */
292
#  if HAVE_SETLOCALE && 0
293
  locale = setlocale (LC_CTYPE, NULL);
294
#  endif
295
  if (locale == NULL || locale[0] == '\0')
296
    {
297
      locale = getenv ("LC_ALL");
298
      if (locale == NULL || locale[0] == '\0')
299
        {
300
          locale = getenv ("LC_CTYPE");
301
          if (locale == NULL || locale[0] == '\0')
302
            locale = getenv ("LANG");
303
        }
304
    }
305
 
306
  /* On some old systems, one used to set locale = "iso8859_1". On others,
307
     you set it to "language_COUNTRY.charset". In any case, we resolve it
308
     through the charset.alias file.  */
309
  codeset = locale;
310
 
311
# endif
312
 
313
#elif defined WIN32
314
 
315
  static char buf[2 + 10 + 1];
316
 
317
  /* Woe32 has a function returning the locale's codepage as a number.  */
318
  sprintf (buf, "CP%u", GetACP ());
319
  codeset = buf;
320
 
321
#elif defined OS2
322
 
323
  const char *locale;
324
  static char buf[2 + 10 + 1];
325
  ULONG cp[3];
326
  ULONG cplen;
327
 
328
  /* Allow user to override the codeset, as set in the operating system,
329
     with standard language environment variables.  */
330
  locale = getenv ("LC_ALL");
331
  if (locale == NULL || locale[0] == '\0')
332
    {
333
      locale = getenv ("LC_CTYPE");
334
      if (locale == NULL || locale[0] == '\0')
335
        locale = getenv ("LANG");
336
    }
337
  if (locale != NULL && locale[0] != '\0')
338
    {
339
      /* If the locale name contains an encoding after the dot, return it.  */
340
      const char *dot = strchr (locale, '.');
341
 
342
      if (dot != NULL)
343
        {
344
          const char *modifier;
345
 
346
          dot++;
347
          /* Look for the possible @... trailer and remove it, if any.  */
348
          modifier = strchr (dot, '@');
349
          if (modifier == NULL)
350
            return dot;
351
          if (modifier - dot < sizeof (buf))
352
            {
353
              memcpy (buf, dot, modifier - dot);
354
              buf [modifier - dot] = '\0';
355
              return buf;
356
            }
357
        }
358
 
359
      /* Resolve through the charset.alias file.  */
360
      codeset = locale;
361
    }
362
  else
363
    {
364
      /* OS/2 has a function returning the locale's codepage as a number.  */
365
      if (DosQueryCp (sizeof (cp), cp, &cplen))
366
        codeset = "";
367
      else
368
        {
369
          sprintf (buf, "CP%u", cp[0]);
370
          codeset = buf;
371
        }
372
    }
373
 
374
#endif
375
 
376
  if (codeset == NULL)
377
    /* The canonical name cannot be determined.  */
378
    codeset = "";
379
 
380
  /* Resolve alias. */
381
  for (aliases = get_charset_aliases ();
382
       *aliases != '\0';
383
       aliases += strlen (aliases) + 1, aliases += strlen (aliases) + 1)
384
    if (strcmp (codeset, aliases) == 0
385
        || (aliases[0] == '*' && aliases[1] == '\0'))
386
      {
387
        codeset = aliases + strlen (aliases) + 1;
388
        break;
389
      }
390
 
391
  /* Don't return an empty string.  GNU libc and GNU libiconv interpret
392
     the empty string as denoting "the locale's character encoding",
393
     thus GNU libiconv would call this function a second time.  */
394
  if (codeset[0] == '\0')
395
    codeset = "ASCII";
396
 
397
  return codeset;
398
}

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