summaryrefslogtreecommitdiffstats
path: root/lib/nl_langinfo.c
blob: 3fa4782231c668087258ef55788ee9c621171ffa (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
/* nl_langinfo() replacement: query locale dependent information.

   Copyright (C) 2007-2022 Free Software Foundation, Inc.

   This file is free software: you can redistribute it and/or modify
   it under the terms of the GNU Lesser General Public License as
   published by the Free Software Foundation; either version 2.1 of the
   License, or (at your option) any later version.

   This file 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 Lesser General Public License for more details.

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

#include <config.h>

/* Specification.  */
#include <langinfo.h>

#include <locale.h>
#include <stdlib.h>
#include <string.h>
#if defined _WIN32 && ! defined __CYGWIN__
# define WIN32_LEAN_AND_MEAN  /* avoid including junk */
# include <windows.h>
# include <stdio.h>
#endif

#if REPLACE_NL_LANGINFO && !NL_LANGINFO_MTSAFE
# if defined _WIN32 && !defined __CYGWIN__

#  define WIN32_LEAN_AND_MEAN  /* avoid including junk */
#  include <windows.h>

# elif HAVE_PTHREAD_API

#  include <pthread.h>
#  if HAVE_THREADS_H && HAVE_WEAK_SYMBOLS
#   include <threads.h>
#   pragma weak thrd_exit
#   define c11_threads_in_use() (thrd_exit != NULL)
#  else
#   define c11_threads_in_use() 0
#  endif

# elif HAVE_THREADS_H

#  include <threads.h>

# endif
#endif

/* nl_langinfo() must be multithread-safe.  To achieve this without using
   thread-local storage:
     1. We use a specific static buffer for each possible argument.
        So that different threads can call nl_langinfo with different arguments,
        without interfering.
     2. We use a simple strcpy or memcpy to fill this static buffer.  Filling it
        through, for example, strcpy + strcat would not be guaranteed to leave
        the buffer's contents intact if another thread is currently accessing
        it.  If necessary, the contents is first assembled in a stack-allocated
        buffer.  */

#if !REPLACE_NL_LANGINFO || GNULIB_defined_CODESET
/* Return the codeset of the current locale, if this is easily deducible.
   Otherwise, return "".  */
static char *
ctype_codeset (void)
{
  static char result[2 + 10 + 1];
  char buf[2 + 10 + 1];
  char locale[SETLOCALE_NULL_MAX];
  char *codeset;
  size_t codesetlen;

  if (setlocale_null_r (LC_CTYPE, locale, sizeof (locale)))
    locale[0] = '\0';

  codeset = buf;
  codeset[0] = '\0';

  if (locale[0])
    {
      /* If the locale name contains an encoding after the dot, return it.  */
      char *dot = strchr (locale, '.');

      if (dot)
        {
          /* Look for the possible @... trailer and remove it, if any.  */
          char *codeset_start = dot + 1;
          char const *modifier = strchr (codeset_start, '@');

          if (! modifier)
            codeset = codeset_start;
          else
            {
              codesetlen = modifier - codeset_start;
              if (codesetlen < sizeof buf)
                {
                  codeset = memcpy (buf, codeset_start, codesetlen);
                  codeset[codesetlen] = '\0';
                }
            }
        }
    }

# if defined _WIN32 && ! defined __CYGWIN__
  /* If setlocale is successful, it returns the number of the
     codepage, as a string.  Otherwise, fall back on Windows API
     GetACP, which returns the locale's codepage as a number (although
     this doesn't change according to what the 'setlocale' call specified).
     Either way, prepend "CP" to make it a valid codeset name.  */
  codesetlen = strlen (codeset);
  if (0 < codesetlen && codesetlen < sizeof buf - 2)
    memmove (buf + 2, codeset, codesetlen + 1);
  else
    sprintf (buf + 2, "%u", GetACP ());
  /* For a locale name such as "French_France.65001", in Windows 10,
     setlocale now returns "French_France.utf8" instead.  */
  if (strcmp (buf + 2, "65001") == 0 || strcmp (buf + 2, "utf8") == 0)
    return (char *) "UTF-8";
  else
    {
      memcpy (buf, "CP", 2);
      strcpy (result, buf);
      return result;
    }
# else
  strcpy (result, codeset);
  return result;
#endif
}
#endif


#if REPLACE_NL_LANGINFO

/* Override nl_langinfo with support for added nl_item values.  */

# undef nl_langinfo

/* Without locking, on Solaris 11.3, test-nl_langinfo-mt fails, with message
   "thread5 disturbed by threadN!", even when threadN invokes only
      nl_langinfo (CODESET);
      nl_langinfo (CRNCYSTR);
   Similarly on Solaris 10.  */

# if !NL_LANGINFO_MTSAFE /* Solaris */

#  define ITEMS (MAXSTRMSG + 1)
#  define MAX_RESULT_LEN 80

static char *
nl_langinfo_unlocked (nl_item item)
{
  static char result[ITEMS][MAX_RESULT_LEN];

  /* The result of nl_langinfo is in storage that can be overwritten by
     other calls to nl_langinfo.  */
  char *tmp = nl_langinfo (item);
  if (item >= 0 && item < ITEMS && tmp != NULL)
    {
      size_t tmp_len = strlen (tmp);
      if (tmp_len < MAX_RESULT_LEN)
        strcpy (result[item], tmp);
      else
        {
          /* Produce a truncated result.  Oh well...  */
          result[item][MAX_RESULT_LEN - 1] = '\0';
          memcpy (result[item], tmp, MAX_RESULT_LEN - 1);
        }
      return result[item];
    }
  else
    return tmp;
}

/* Use a lock, so that no two threads can invoke nl_langinfo_unlocked
   at the same time.  */

/* Prohibit renaming this symbol.  */
#  undef gl_get_nl_langinfo_lock

#  if defined _WIN32 && !defined __CYGWIN__

extern __declspec(dllimport) CRITICAL_SECTION *gl_get_nl_langinfo_lock (void);

static char *
nl_langinfo_with_lock (nl_item item)
{
  CRITICAL_SECTION *lock = gl_get_nl_langinfo_lock ();
  char *ret;

  EnterCriticalSection (lock);
  ret = nl_langinfo_unlocked (item);
  LeaveCriticalSection (lock);

  return ret;
}

#  elif HAVE_PTHREAD_API

extern
#   if defined _WIN32 || defined __CYGWIN__
  __declspec(dllimport)
#   endif
  pthread_mutex_t *gl_get_nl_langinfo_lock (void);

#   if HAVE_WEAK_SYMBOLS /* musl libc, FreeBSD, NetBSD, OpenBSD, Haiku */

     /* Avoid the need to link with '-lpthread'.  */
#    pragma weak pthread_mutex_lock
#    pragma weak pthread_mutex_unlock

     /* Determine whether libpthread is in use.  */
#    pragma weak pthread_mutexattr_gettype
     /* See the comments in lock.h.  */
#    define pthread_in_use() \
       (pthread_mutexattr_gettype != NULL || c11_threads_in_use ())

#   else
#    define pthread_in_use() 1
#   endif

static char *
nl_langinfo_with_lock (nl_item item)
{
  if (pthread_in_use())
    {
      pthread_mutex_t *lock = gl_get_nl_langinfo_lock ();
      char *ret;

      if (pthread_mutex_lock (lock))
        abort ();
      ret = nl_langinfo_unlocked (item);
      if (pthread_mutex_unlock (lock))
        abort ();

      return ret;
    }
  else
    return nl_langinfo_unlocked (item);
}

#  elif HAVE_THREADS_H

extern mtx_t *gl_get_nl_langinfo_lock (void);

static char *
nl_langinfo_with_lock (nl_item item)
{
  mtx_t *lock = gl_get_nl_langinfo_lock ();
  char *ret;

  if (mtx_lock (lock) != thrd_success)
    abort ();
  ret = nl_langinfo_unlocked (item);
  if (mtx_unlock (lock) != thrd_success)
    abort ();

  return ret;
}

#  endif

# else

/* On other platforms, no lock is needed.  */
#  define nl_langinfo_with_lock nl_langinfo

# endif

char *
rpl_nl_langinfo (nl_item item)
{
  switch (item)
    {
# if GNULIB_defined_CODESET
    case CODESET:
      return ctype_codeset ();
# endif
# if GNULIB_defined_T_FMT_AMPM
    case T_FMT_AMPM:
      return (char *) "%I:%M:%S %p";
# endif
# if GNULIB_defined_ALTMON
    case ALTMON_1:
    case ALTMON_2:
    case ALTMON_3:
    case ALTMON_4:
    case ALTMON_5:
    case ALTMON_6:
    case ALTMON_7:
    case ALTMON_8:
    case ALTMON_9:
    case ALTMON_10:
    case ALTMON_11:
    case ALTMON_12:
      /* We don't ship the appropriate localizations with gnulib.  Therefore,
         treat ALTMON_i like MON_i.  */
      item = item - ALTMON_1 + MON_1;
      break;
# endif
# if GNULIB_defined_ERA
    case ERA:
      /* The format is not standardized.  In glibc it is a sequence of strings
         of the form "direction:offset:start_date:end_date:era_name:era_format"
         with an empty string at the end.  */
      return (char *) "";
    case ERA_D_FMT:
      /* The %Ex conversion in strftime behaves like %x if the locale does not
         have an alternative time format.  */
      item = D_FMT;
      break;
    case ERA_D_T_FMT:
      /* The %Ec conversion in strftime behaves like %c if the locale does not
         have an alternative time format.  */
      item = D_T_FMT;
      break;
    case ERA_T_FMT:
      /* The %EX conversion in strftime behaves like %X if the locale does not
         have an alternative time format.  */
      item = T_FMT;
      break;
    case ALT_DIGITS:
      /* The format is not standardized.  In glibc it is a sequence of 10
         strings, appended in memory.  */
      return (char *) "\0\0\0\0\0\0\0\0\0\0";
# endif
# if GNULIB_defined_YESEXPR || !FUNC_NL_LANGINFO_YESEXPR_WORKS
    case YESEXPR:
      return (char *) "^[yY]";
    case NOEXPR:
      return (char *) "^[nN]";
# endif
    default:
      break;
    }
  return nl_langinfo_with_lock (item);
}

#else

/* Provide nl_langinfo from scratch, either for native MS-Windows, or
   for old Unix platforms without locales, such as Linux libc5 or
   BeOS.  */

# include <time.h>

char *
nl_langinfo (nl_item item)
{
  char buf[100];
  struct tm tmm = { 0 };

  switch (item)
    {
    /* nl_langinfo items of the LC_CTYPE category */
    case CODESET:
      {
        char *codeset = ctype_codeset ();
        if (*codeset)
          return codeset;
      }
# ifdef __BEOS__
      return (char *) "UTF-8";
# else
      return (char *) "ISO-8859-1";
# endif
    /* nl_langinfo items of the LC_NUMERIC category */
    case RADIXCHAR:
      return localeconv () ->decimal_point;
    case THOUSEP:
      return localeconv () ->thousands_sep;
# ifdef GROUPING
    case GROUPING:
      return localeconv () ->grouping;
# endif
    /* nl_langinfo items of the LC_TIME category.
       TODO: Really use the locale.  */
    case D_T_FMT:
    case ERA_D_T_FMT:
      return (char *) "%a %b %e %H:%M:%S %Y";
    case D_FMT:
    case ERA_D_FMT:
      return (char *) "%m/%d/%y";
    case T_FMT:
    case ERA_T_FMT:
      return (char *) "%H:%M:%S";
    case T_FMT_AMPM:
      return (char *) "%I:%M:%S %p";
    case AM_STR:
      {
        static char result[80];
        if (!strftime (buf, sizeof result, "%p", &tmm))
          return (char *) "AM";
        strcpy (result, buf);
        return result;
      }
    case PM_STR:
      {
        static char result[80];
        tmm.tm_hour = 12;
        if (!strftime (buf, sizeof result, "%p", &tmm))
          return (char *) "PM";
        strcpy (result, buf);
        return result;
      }
    case DAY_1:
    case DAY_2:
    case DAY_3:
    case DAY_4:
    case DAY_5:
    case DAY_6:
    case DAY_7:
      {
        static char result[7][50];
        static char const days[][sizeof "Wednesday"] = {
          "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday",
          "Friday", "Saturday"
        };
        tmm.tm_wday = item - DAY_1;
        if (!strftime (buf, sizeof result[0], "%A", &tmm))
          return (char *) days[item - DAY_1];
        strcpy (result[item - DAY_1], buf);
        return result[item - DAY_1];
      }
    case ABDAY_1:
    case ABDAY_2:
    case ABDAY_3:
    case ABDAY_4:
    case ABDAY_5:
    case ABDAY_6:
    case ABDAY_7:
      {
        static char result[7][30];
        static char const abdays[][sizeof "Sun"] = {
          "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
        };
        tmm.tm_wday = item - ABDAY_1;
        if (!strftime (buf, sizeof result[0], "%a", &tmm))
          return (char *) abdays[item - ABDAY_1];
        strcpy (result[item - ABDAY_1], buf);
        return result[item - ABDAY_1];
      }
    {
      static char const months[][sizeof "September"] = {
        "January", "February", "March", "April", "May", "June", "July",
        "September", "October", "November", "December"
      };
      case MON_1:
      case MON_2:
      case MON_3:
      case MON_4:
      case MON_5:
      case MON_6:
      case MON_7:
      case MON_8:
      case MON_9:
      case MON_10:
      case MON_11:
      case MON_12:
        {
          static char result[12][50];
          tmm.tm_mon = item - MON_1;
          if (!strftime (buf, sizeof result[0], "%B", &tmm))
            return (char *) months[item - MON_1];
          strcpy (result[item - MON_1], buf);
          return result[item - MON_1];
        }
      case ALTMON_1:
      case ALTMON_2:
      case ALTMON_3:
      case ALTMON_4:
      case ALTMON_5:
      case ALTMON_6:
      case ALTMON_7:
      case ALTMON_8:
      case ALTMON_9:
      case ALTMON_10:
      case ALTMON_11:
      case ALTMON_12:
        {
          static char result[12][50];
          tmm.tm_mon = item - ALTMON_1;
          /* The platforms without nl_langinfo() don't support strftime with
             %OB.  We don't even need to try.  */
          #if 0
          if (!strftime (buf, sizeof result[0], "%OB", &tmm))
          #endif
            if (!strftime (buf, sizeof result[0], "%B", &tmm))
              return (char *) months[item - ALTMON_1];
          strcpy (result[item - ALTMON_1], buf);
          return result[item - ALTMON_1];
        }
    }
    case ABMON_1:
    case ABMON_2:
    case ABMON_3:
    case ABMON_4:
    case ABMON_5:
    case ABMON_6:
    case ABMON_7:
    case ABMON_8:
    case ABMON_9:
    case ABMON_10:
    case ABMON_11:
    case ABMON_12:
      {
        static char result[12][30];
        static char const abmonths[][sizeof "Jan"] = {
          "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul",
          "Sep", "Oct", "Nov", "Dec"
        };
        tmm.tm_mon = item - ABMON_1;
        if (!strftime (buf, sizeof result[0], "%b", &tmm))
          return (char *) abmonths[item - ABMON_1];
        strcpy (result[item - ABMON_1], buf);
        return result[item - ABMON_1];
      }
    case ERA:
      return (char *) "";
    case ALT_DIGITS:
      return (char *) "\0\0\0\0\0\0\0\0\0\0";
    /* nl_langinfo items of the LC_MONETARY category.  */
    case CRNCYSTR:
      return localeconv () ->currency_symbol;
# ifdef INT_CURR_SYMBOL
    case INT_CURR_SYMBOL:
      return localeconv () ->int_curr_symbol;
    case MON_DECIMAL_POINT:
      return localeconv () ->mon_decimal_point;
    case MON_THOUSANDS_SEP:
      return localeconv () ->mon_thousands_sep;
    case MON_GROUPING:
      return localeconv () ->mon_grouping;
    case POSITIVE_SIGN:
      return localeconv () ->positive_sign;
    case NEGATIVE_SIGN:
      return localeconv () ->negative_sign;
    case FRAC_DIGITS:
      return & localeconv () ->frac_digits;
    case INT_FRAC_DIGITS:
      return & localeconv () ->int_frac_digits;
    case P_CS_PRECEDES:
      return & localeconv () ->p_cs_precedes;
    case N_CS_PRECEDES:
      return & localeconv () ->n_cs_precedes;
    case P_SEP_BY_SPACE:
      return & localeconv () ->p_sep_by_space;
    case N_SEP_BY_SPACE:
      return & localeconv () ->n_sep_by_space;
    case P_SIGN_POSN:
      return & localeconv () ->p_sign_posn;
    case N_SIGN_POSN:
      return & localeconv () ->n_sign_posn;
# endif
    /* nl_langinfo items of the LC_MESSAGES category
       TODO: Really use the locale. */
    case YESEXPR:
      return (char *) "^[yY]";
    case NOEXPR:
      return (char *) "^[nN]";
    default:
      return (char *) "";
    }
}

#endif