summaryrefslogtreecommitdiff
path: root/lib/localcharset.c
blob: 14b9cba6ab8418118c9ec2a08360d13eda000b99 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
/* Determine a canonical name for the current locale's character encoding.

   Copyright (C) 2000-2006, 2008-2018 Free Software Foundation, Inc.

   This program is free software: you can redistribute it and/or
   modify it under the terms of either:

     * the GNU Lesser General Public License as published by the Free
       Software Foundation; either version 3 of the License, or (at your
       option) any later version.

   or

     * the GNU General Public License as published by the Free
       Software Foundation; either version 2 of the License, or (at your
       option) any later version.

   or both in parallel, as here.
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License along
   with this program; if not, see <https://www.gnu.org/licenses/>.  */

/* Written by Bruno Haible <bruno@clisp.org>.  */

#include <config.h>

/* Specification.  */
#include "localcharset.h"

#include <fcntl.h>
#include <stddef.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>

#if defined __APPLE__ && defined __MACH__ && HAVE_LANGINFO_CODESET
# define DARWIN7 /* Darwin 7 or newer, i.e. Mac OS X 10.3 or newer */
#endif

#if defined _WIN32 && !defined __CYGWIN__
# define WINDOWS_NATIVE
# include <locale.h>
#endif

#if defined __EMX__
/* Assume EMX program runs on OS/2, even if compiled under DOS.  */
# ifndef OS2
#  define OS2
# endif
#endif

#if !defined WINDOWS_NATIVE
# include <unistd.h>
# if HAVE_LANGINFO_CODESET
#  include <langinfo.h>
# else
#  if 0 /* see comment below */
#   include <locale.h>
#  endif
# endif
# ifdef __CYGWIN__
#  define WIN32_LEAN_AND_MEAN
#  include <windows.h>
# endif
#elif defined WINDOWS_NATIVE
# define WIN32_LEAN_AND_MEAN
# include <windows.h>
#endif
#if defined OS2
# define INCL_DOS
# include <os2.h>
#endif

/* For MB_CUR_MAX_L */
#if defined DARWIN7
# include <xlocale.h>
#endif

#if ENABLE_RELOCATABLE
# include "relocatable.h"
#else
# define relocate(pathname) (pathname)
# define relocate2(pathname,allocatedp) (*(allocatedp) = NULL, (pathname))
#endif

/* Get LIBDIR.  */
#ifndef LIBDIR
# include "configmake.h"
#endif

/* Define O_NOFOLLOW to 0 on platforms where it does not exist.  */
#ifndef O_NOFOLLOW
# define O_NOFOLLOW 0
#endif

#if defined _WIN32 || defined __CYGWIN__ || defined __EMX__ || defined __DJGPP__
  /* Native Windows, Cygwin, OS/2, DOS */
# define ISSLASH(C) ((C) == '/' || (C) == '\\')
#endif

#ifndef DIRECTORY_SEPARATOR
# define DIRECTORY_SEPARATOR '/'
#endif

#ifndef ISSLASH
# define ISSLASH(C) ((C) == DIRECTORY_SEPARATOR)
#endif

#if HAVE_DECL_GETC_UNLOCKED
# undef getc
# define getc getc_unlocked
#endif

/* The following static variable is declared 'volatile' to avoid a
   possible multithread problem in the function get_charset_aliases. If we
   are running in a threaded environment, and if two threads initialize
   'charset_aliases' simultaneously, both will produce the same value,
   and everything will be ok if the two assignments to 'charset_aliases'
   are atomic. But I don't know what will happen if the two assignments mix.  */
#if __STDC__ != 1
# define volatile /* empty */
#endif
/* Pointer to the contents of the charset.alias file, if it has already been
   read, else NULL.  Its format is:
   ALIAS_1 '\0' CANONICAL_1 '\0' ... ALIAS_n '\0' CANONICAL_n '\0' '\0'  */
static const char * volatile charset_aliases;

/* Return a pointer to the contents of the charset.alias file.  */
static const char *
get_charset_aliases (void)
{
  const char *cp;

  cp = charset_aliases;
  if (cp == NULL)
    {
#if !(defined DARWIN7 || defined VMS || defined WINDOWS_NATIVE || defined __CYGWIN__ || defined OS2)
      char *malloc_dir = NULL;
      const char *dir;
      const char *base = "charset.alias";
      char *file_name;

      /* Make it possible to override the charset.alias location.  This is
         necessary for running the testsuite before "make install".  */
      dir = getenv ("CHARSETALIASDIR");
      if (dir == NULL || dir[0] == '\0')
        dir = relocate2 (LIBDIR, &malloc_dir);

      /* Concatenate dir and base into freshly allocated file_name.  */
      {
        size_t dir_len = strlen (dir);
        size_t base_len = strlen (base);
        int add_slash = (dir_len > 0 && !ISSLASH (dir[dir_len - 1]));
        file_name = (char *) malloc (dir_len + add_slash + base_len + 1);
        if (file_name != NULL)
          {
            memcpy (file_name, dir, dir_len);
            if (add_slash)
              file_name[dir_len] = DIRECTORY_SEPARATOR;
            memcpy (file_name + dir_len + add_slash, base, base_len + 1);
          }
      }

      free (malloc_dir);

      if (file_name == NULL)
        /* Out of memory.  Treat the file as empty.  */
        cp = "";
      else
        {
          int fd;

          /* Open the file.  Reject symbolic links on platforms that support
             O_NOFOLLOW.  This is a security feature.  Without it, an attacker
             could retrieve parts of the contents (namely, the tail of the
             first line that starts with "* ") of an arbitrary file by placing
             a symbolic link to that file under the name "charset.alias" in
             some writable directory and defining the environment variable
             CHARSETALIASDIR to point to that directory.  */
          fd = open (file_name,
                     O_RDONLY | (HAVE_WORKING_O_NOFOLLOW ? O_NOFOLLOW : 0));
          if (fd < 0)
            /* File not found.  Treat it as empty.  */
            cp = "";
          else
            {
              FILE *fp;

              fp = fdopen (fd, "r");
              if (fp == NULL)
                {
                  /* Out of memory.  Treat the file as empty.  */
                  close (fd);
                  cp = "";
                }
              else
                {
                  /* Parse the file's contents.  */
                  char *res_ptr = NULL;
                  size_t res_size = 0;

                  for (;;)
                    {
                      int c;
                      char buf1[50+1];
                      char buf2[50+1];
                      size_t l1, l2;
                      char *old_res_ptr;

                      c = getc (fp);
                      if (c == EOF)
                        break;
                      if (c == '\n' || c == ' ' || c == '\t')
                        continue;
                      if (c == '#')
                        {
                          /* Skip comment, to end of line.  */
                          do
                            c = getc (fp);
                          while (!(c == EOF || c == '\n'));
                          if (c == EOF)
                            break;
                          continue;
                        }
                      ungetc (c, fp);
                      if (fscanf (fp, "%50s %50s", buf1, buf2) < 2)
                        break;
                      l1 = strlen (buf1);
                      l2 = strlen (buf2);
                      old_res_ptr = res_ptr;
                      if (res_size == 0)
                        {
                          res_size = l1 + 1 + l2 + 1;
                          res_ptr = (char *) malloc (res_size + 1);
                        }
                      else
                        {
                          res_size += l1 + 1 + l2 + 1;
                          res_ptr = (char *) realloc (res_ptr, res_size + 1);
                        }
                      if (res_ptr == NULL)
                        {
                          /* Out of memory. */
                          res_size = 0;
                          free (old_res_ptr);
                          break;
                        }
                      strcpy (res_ptr + res_size - (l2 + 1) - (l1 + 1), buf1);
                      strcpy (res_ptr + res_size - (l2 + 1), buf2);
                    }
                  fclose (fp);
                  if (res_size == 0)
                    cp = "";
                  else
                    {
                      *(res_ptr + res_size) = '\0';
                      cp = res_ptr;
                    }
                }
            }

          free (file_name);
        }

#else

# if defined DARWIN7
      /* To avoid the trouble of installing a file that is shared by many
         GNU packages -- many packaging systems have problems with this --,
         simply inline the aliases here.
         For speed, map the most frequent case first.  */
      cp = "UTF-8" "\0" "UTF-8" "\0"
           "ISO8859-1" "\0" "ISO-8859-1" "\0"
           "ISO8859-2" "\0" "ISO-8859-2" "\0"
           "ISO8859-4" "\0" "ISO-8859-4" "\0"
           "ISO8859-5" "\0" "ISO-8859-5" "\0"
           "ISO8859-7" "\0" "ISO-8859-7" "\0"
           "ISO8859-9" "\0" "ISO-8859-9" "\0"
           "ISO8859-13" "\0" "ISO-8859-13" "\0"
           "ISO8859-15" "\0" "ISO-8859-15" "\0"
           "KOI8-R" "\0" "KOI8-R" "\0"
           "KOI8-U" "\0" "KOI8-U" "\0"
           "CP866" "\0" "CP866" "\0"
           "CP949" "\0" "CP949" "\0"
           "CP1131" "\0" "CP1131" "\0"
           "CP1251" "\0" "CP1251" "\0"
           "eucCN" "\0" "GB2312" "\0"
           "GB2312" "\0" "GB2312" "\0"
           "eucJP" "\0" "EUC-JP" "\0"
           "eucKR" "\0" "EUC-KR" "\0"
           "Big5" "\0" "BIG5" "\0"
           "Big5HKSCS" "\0" "BIG5-HKSCS" "\0"
           "GBK" "\0" "GBK" "\0"
           "GB18030" "\0" "GB18030" "\0"
           "SJIS" "\0" "SHIFT_JIS" "\0"
           "ARMSCII-8" "\0" "ARMSCII-8" "\0"
           "PT154" "\0" "PT154" "\0"
         /*"ISCII-DEV" "\0" "?" "\0"*/
           "*" "\0" "UTF-8" "\0";
# endif

# if defined VMS
      /* To avoid the troubles of an extra file charset.alias_vms in the
         sources of many GNU packages, simply inline the aliases here.  */
      /* The list of encodings is taken from the OpenVMS 7.3-1 documentation
         "Compaq C Run-Time Library Reference Manual for OpenVMS systems"
         section 10.7 "Handling Different Character Sets".  */
      cp = "ISO8859-1" "\0" "ISO-8859-1" "\0"
           "ISO8859-2" "\0" "ISO-8859-2" "\0"
           "ISO8859-5" "\0" "ISO-8859-5" "\0"
           "ISO8859-7" "\0" "ISO-8859-7" "\0"
           "ISO8859-8" "\0" "ISO-8859-8" "\0"
           "ISO8859-9" "\0" "ISO-8859-9" "\0"
           /* Japanese */
           "eucJP" "\0" "EUC-JP" "\0"
           "SJIS" "\0" "SHIFT_JIS" "\0"
           "DECKANJI" "\0" "DEC-KANJI" "\0"
           "SDECKANJI" "\0" "EUC-JP" "\0"
           /* Chinese */
           "eucTW" "\0" "EUC-TW" "\0"
           "DECHANYU" "\0" "DEC-HANYU" "\0"
           "DECHANZI" "\0" "GB2312" "\0"
           /* Korean */
           "DECKOREAN" "\0" "EUC-KR" "\0";
# endif

# if defined WINDOWS_NATIVE || defined __CYGWIN__
      /* To avoid the troubles of installing a separate file in the same
         directory as the DLL and of retrieving the DLL's directory at
         runtime, simply inline the aliases here.  */

      cp = "CP936" "\0" "GBK" "\0"
           "CP1361" "\0" "JOHAB" "\0"
           "CP20127" "\0" "ASCII" "\0"
           "CP20866" "\0" "KOI8-R" "\0"
           "CP20936" "\0" "GB2312" "\0"
           "CP21866" "\0" "KOI8-RU" "\0"
           "CP28591" "\0" "ISO-8859-1" "\0"
           "CP28592" "\0" "ISO-8859-2" "\0"
           "CP28593" "\0" "ISO-8859-3" "\0"
           "CP28594" "\0" "ISO-8859-4" "\0"
           "CP28595" "\0" "ISO-8859-5" "\0"
           "CP28596" "\0" "ISO-8859-6" "\0"
           "CP28597" "\0" "ISO-8859-7" "\0"
           "CP28598" "\0" "ISO-8859-8" "\0"
           "CP28599" "\0" "ISO-8859-9" "\0"
           "CP28605" "\0" "ISO-8859-15" "\0"
           "CP38598" "\0" "ISO-8859-8" "\0"
           "CP51932" "\0" "EUC-JP" "\0"
           "CP51936" "\0" "GB2312" "\0"
           "CP51949" "\0" "EUC-KR" "\0"
           "CP51950" "\0" "EUC-TW" "\0"
           "CP54936" "\0" "GB18030" "\0"
           "CP65001" "\0" "UTF-8" "\0";
# endif
# if defined OS2
      /* To avoid the troubles of installing a separate file in the same
         directory as the DLL and of retrieving the DLL's directory at
         runtime, simply inline the aliases here.  */

      /* The list of encodings is taken from "List of OS/2 Codepages"
         by Alex Taylor:
         <http://altsan.org/os2/toolkits/uls/index.html#codepages>.
         See also "IBM Globalization - Code page identifiers":
         <https://www-01.ibm.com/software/globalization/cp/cp_cpgid.html>.  */
      cp = "CP813" "\0" "ISO-8859-7" "\0"
           "CP878" "\0" "KOI8-R" "\0"
           "CP819" "\0" "ISO-8859-1" "\0"
           "CP912" "\0" "ISO-8859-2" "\0"
           "CP913" "\0" "ISO-8859-3" "\0"
           "CP914" "\0" "ISO-8859-4" "\0"
           "CP915" "\0" "ISO-8859-5" "\0"
           "CP916" "\0" "ISO-8859-8" "\0"
           "CP920" "\0" "ISO-8859-9" "\0"
           "CP921" "\0" "ISO-8859-13" "\0"
           "CP923" "\0" "ISO-8859-15" "\0"
           "CP954" "\0" "EUC-JP" "\0"
           "CP964" "\0" "EUC-TW" "\0"
           "CP970" "\0" "EUC-KR" "\0"
           "CP1089" "\0" "ISO-8859-6" "\0"
           "CP1208" "\0" "UTF-8" "\0"
           "CP1381" "\0" "GB2312" "\0"
           "CP1386" "\0" "GBK" "\0"
           "CP3372" "\0" "EUC-JP" "\0";
# endif
#endif

      charset_aliases = cp;
    }

  return cp;
}

/* Determine the current locale's character encoding, and canonicalize it
   into one of the canonical names listed in config.charset.
   The result must not be freed; it is statically allocated.
   If the canonical name cannot be determined, the result is a non-canonical
   name.  */

#ifdef STATIC
STATIC
#endif
const char *
locale_charset (void)
{
  const char *codeset;
  const char *aliases;

#if !(defined WINDOWS_NATIVE || defined OS2)

# if HAVE_LANGINFO_CODESET

  /* Most systems support nl_langinfo (CODESET) nowadays.  */
  codeset = nl_langinfo (CODESET);

#  ifdef __CYGWIN__
  /* Cygwin < 1.7 does not have locales.  nl_langinfo (CODESET) always
     returns "US-ASCII".  Return the suffix of the locale name from the
     environment variables (if present) or the codepage as a number.  */
  if (codeset != NULL && strcmp (codeset, "US-ASCII") == 0)
    {
      const char *locale;
      static char buf[2 + 10 + 1];

      locale = getenv ("LC_ALL");
      if (locale == NULL || locale[0] == '\0')
        {
          locale = getenv ("LC_CTYPE");
          if (locale == NULL || locale[0] == '\0')
            locale = getenv ("LANG");
        }
      if (locale != NULL && locale[0] != '\0')
        {
          /* If the locale name contains an encoding after the dot, return
             it.  */
          const char *dot = strchr (locale, '.');

          if (dot != NULL)
            {
              const char *modifier;

              dot++;
              /* Look for the possible @... trailer and remove it, if any.  */
              modifier = strchr (dot, '@');
              if (modifier == NULL)
                return dot;
              if (modifier - dot < sizeof (buf))
                {
                  memcpy (buf, dot, modifier - dot);
                  buf [modifier - dot] = '\0';
                  return buf;
                }
            }
        }

      /* The Windows API has a function returning the locale's codepage as a
         number: GetACP().  This encoding is used by Cygwin, unless the user
         has set the environment variable CYGWIN=codepage:oem (which very few
         people do).
         Output directed to console windows needs to be converted (to
         GetOEMCP() if the console is using a raster font, or to
         GetConsoleOutputCP() if it is using a TrueType font).  Cygwin does
         this conversion transparently (see winsup/cygwin/fhandler_console.cc),
         converting to GetConsoleOutputCP().  This leads to correct results,
         except when SetConsoleOutputCP has been called and a raster font is
         in use.  */
      sprintf (buf, "CP%u", GetACP ());
      codeset = buf;
    }
#  endif

# else

  /* On old systems which lack it, use setlocale or getenv.  */
  const char *locale = NULL;

  /* But most old systems don't have a complete set of locales.  Some
     (like SunOS 4 or DJGPP) have only the C locale.  Therefore we don't
     use setlocale here; it would return "C" when it doesn't support the
     locale name the user has set.  */
#  if 0
  locale = setlocale (LC_CTYPE, NULL);
#  endif
  if (locale == NULL || locale[0] == '\0')
    {
      locale = getenv ("LC_ALL");
      if (locale == NULL || locale[0] == '\0')
        {
          locale = getenv ("LC_CTYPE");
          if (locale == NULL || locale[0] == '\0')
            locale = getenv ("LANG");
        }
    }

  /* On some old systems, one used to set locale = "iso8859_1". On others,
     you set it to "language_COUNTRY.charset". In any case, we resolve it
     through the charset.alias file.  */
  codeset = locale;

# endif

#elif defined WINDOWS_NATIVE

  static char buf[2 + 10 + 1];

  /* The Windows API has a function returning the locale's codepage as
     a number, but the value doesn't change according to what the
     'setlocale' call specified.  So we use it as a last resort, in
     case the string returned by 'setlocale' doesn't specify the
     codepage.  */
  char *current_locale = setlocale (LC_ALL, NULL);
  char *pdot;

  /* If they set different locales for different categories,
     'setlocale' will return a semi-colon separated list of locale
     values.  To make sure we use the correct one, we choose LC_CTYPE.  */
  if (strchr (current_locale, ';'))
    current_locale = setlocale (LC_CTYPE, NULL);

  pdot = strrchr (current_locale, '.');
  if (pdot && 2 + strlen (pdot + 1) + 1 <= sizeof (buf))
    sprintf (buf, "CP%s", pdot + 1);
  else
    {
      /* The Windows API has a function returning the locale's codepage as a
        number: GetACP().
        When the output goes to a console window, it needs to be provided in
        GetOEMCP() encoding if the console is using a raster font, or in
        GetConsoleOutputCP() encoding if it is using a TrueType font.
        But in GUI programs and for output sent to files and pipes, GetACP()
        encoding is the best bet.  */
      sprintf (buf, "CP%u", GetACP ());
    }
  codeset = buf;

#elif defined OS2

  const char *locale;
  static char buf[2 + 10 + 1];
  ULONG cp[3];
  ULONG cplen;

  codeset = NULL;

  /* Allow user to override the codeset, as set in the operating system,
     with standard language environment variables.  */
  locale = getenv ("LC_ALL");
  if (locale == NULL || locale[0] == '\0')
    {
      locale = getenv ("LC_CTYPE");
      if (locale == NULL || locale[0] == '\0')
        locale = getenv ("LANG");
    }
  if (locale != NULL && locale[0] != '\0')
    {
      /* If the locale name contains an encoding after the dot, return it.  */
      const char *dot = strchr (locale, '.');

      if (dot != NULL)
        {
          const char *modifier;

          dot++;
          /* Look for the possible @... trailer and remove it, if any.  */
          modifier = strchr (dot, '@');
          if (modifier == NULL)
            return dot;
          if (modifier - dot < sizeof (buf))
            {
              memcpy (buf, dot, modifier - dot);
              buf [modifier - dot] = '\0';
              return buf;
            }
        }

      /* For the POSIX locale, don't use the system's codepage.  */
      if (strcmp (locale, "C") == 0 || strcmp (locale, "POSIX") == 0)
        codeset = "";
    }

  if (codeset == NULL)
    {
      /* OS/2 has a function returning the locale's codepage as a number.  */
      if (DosQueryCp (sizeof (cp), cp, &cplen))
        codeset = "";
      else
        {
          sprintf (buf, "CP%u", cp[0]);
          codeset = buf;
        }
    }

#endif

  if (codeset == NULL)
    /* The canonical name cannot be determined.  */
    codeset = "";

  /* Resolve alias. */
  for (aliases = get_charset_aliases ();
       *aliases != '\0';
       aliases += strlen (aliases) + 1, aliases += strlen (aliases) + 1)
    if (strcmp (codeset, aliases) == 0
        || (aliases[0] == '*' && aliases[1] == '\0'))
      {
        codeset = aliases + strlen (aliases) + 1;
        break;
      }

  /* Don't return an empty string.  GNU libc and GNU libiconv interpret
     the empty string as denoting "the locale's character encoding",
     thus GNU libiconv would call this function a second time.  */
  if (codeset[0] == '\0')
    codeset = "ASCII";

#ifdef DARWIN7
  /* Mac OS X sets MB_CUR_MAX to 1 when LC_ALL=C, and "UTF-8"
     (the default codeset) does not work when MB_CUR_MAX is 1.  */
  if (strcmp (codeset, "UTF-8") == 0 && MB_CUR_MAX_L (uselocale (NULL)) <= 1)
    codeset = "ASCII";
#endif

  return codeset;
}