summaryrefslogtreecommitdiffstats
path: root/lib/setlocale_null.c
blob: 89c8a065981da3fdfedb1968d6b438f5e269635d (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
/* Query the name of the current global locale.
   Copyright (C) 2019-2023 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/>.  */

/* Written by Bruno Haible <bruno@clisp.org>, 2019.  */

#include <config.h>

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

#include <errno.h>
#include <locale.h>
#include <stdlib.h>
#include <string.h>
#if defined _WIN32 && !defined __CYGWIN__
# include <wchar.h>
#endif

#if !(SETLOCALE_NULL_ALL_MTSAFE && SETLOCALE_NULL_ONE_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

/* Use the system's setlocale() function, not the gnulib override, here.  */
#undef setlocale

static const char *
setlocale_null_androidfix (int category)
{
  const char *result = setlocale (category, NULL);

#ifdef __ANDROID__
  if (result == NULL)
    switch (category)
      {
      case LC_CTYPE:
      case LC_NUMERIC:
      case LC_TIME:
      case LC_COLLATE:
      case LC_MONETARY:
      case LC_MESSAGES:
      case LC_ALL:
      case LC_PAPER:
      case LC_NAME:
      case LC_ADDRESS:
      case LC_TELEPHONE:
      case LC_MEASUREMENT:
        result = "C";
        break;
      default:
        break;
      }
#endif

  return result;
}

static int
setlocale_null_unlocked (int category, char *buf, size_t bufsize)
{
#if defined _WIN32 && !defined __CYGWIN__ && defined _MSC_VER
  /* On native Windows, nowadays, the setlocale() implementation is based
     on _wsetlocale() and uses malloc() for the result.  We are better off
     using _wsetlocale() directly.  */
  const wchar_t *result = _wsetlocale (category, NULL);

  if (result == NULL)
    {
      /* CATEGORY is invalid.  */
      if (bufsize > 0)
        /* Return an empty string in BUF.
           This is a convenience for callers that don't want to write explicit
           code for handling EINVAL.  */
        buf[0] = '\0';
      return EINVAL;
    }
  else
    {
      size_t length = wcslen (result);
      if (length < bufsize)
        {
          size_t i;

          /* Convert wchar_t[] -> char[], assuming plain ASCII.  */
          for (i = 0; i <= length; i++)
            buf[i] = result[i];

          return 0;
        }
      else
        {
          if (bufsize > 0)
            {
              /* Return a truncated result in BUF.
                 This is a convenience for callers that don't want to write
                 explicit code for handling ERANGE.  */
              size_t i;

              /* Convert wchar_t[] -> char[], assuming plain ASCII.  */
              for (i = 0; i < bufsize; i++)
                buf[i] = result[i];
              buf[bufsize - 1] = '\0';
            }
          return ERANGE;
        }
    }
#else
  const char *result = setlocale_null_androidfix (category);

  if (result == NULL)
    {
      /* CATEGORY is invalid.  */
      if (bufsize > 0)
        /* Return an empty string in BUF.
           This is a convenience for callers that don't want to write explicit
           code for handling EINVAL.  */
        buf[0] = '\0';
      return EINVAL;
    }
  else
    {
      size_t length = strlen (result);
      if (length < bufsize)
        {
          memcpy (buf, result, length + 1);
          return 0;
        }
      else
        {
          if (bufsize > 0)
            {
              /* Return a truncated result in BUF.
                 This is a convenience for callers that don't want to write
                 explicit code for handling ERANGE.  */
              memcpy (buf, result, bufsize - 1);
              buf[bufsize - 1] = '\0';
            }
          return ERANGE;
        }
    }
#endif
}

#if !(SETLOCALE_NULL_ALL_MTSAFE && SETLOCALE_NULL_ONE_MTSAFE) /* musl libc, macOS, FreeBSD, NetBSD, OpenBSD, AIX, Haiku, Cygwin < 3.4.6 */

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

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

# if defined _WIN32 && !defined __CYGWIN__

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

static int
setlocale_null_with_lock (int category, char *buf, size_t bufsize)
{
  CRITICAL_SECTION *lock = gl_get_setlocale_null_lock ();
  int ret;

  EnterCriticalSection (lock);
  ret = setlocale_null_unlocked (category, buf, bufsize);
  LeaveCriticalSection (lock);

  return ret;
}

# elif HAVE_PTHREAD_API /* musl libc, macOS, FreeBSD, NetBSD, OpenBSD, AIX, Haiku, Cygwin < 3.4.6 */

extern
#  if defined _WIN32 || defined __CYGWIN__
  __declspec(dllimport)
#  endif
  pthread_mutex_t *gl_get_setlocale_null_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 int
setlocale_null_with_lock (int category, char *buf, size_t bufsize)
{
  if (pthread_in_use())
    {
      pthread_mutex_t *lock = gl_get_setlocale_null_lock ();
      int ret;

      if (pthread_mutex_lock (lock))
        abort ();
      ret = setlocale_null_unlocked (category, buf, bufsize);
      if (pthread_mutex_unlock (lock))
        abort ();

      return ret;
    }
  else
    return setlocale_null_unlocked (category, buf, bufsize);
}

# elif HAVE_THREADS_H

extern mtx_t *gl_get_setlocale_null_lock (void);

static int
setlocale_null_with_lock (int category, char *buf, size_t bufsize)
{
  mtx_t *lock = gl_get_setlocale_null_lock ();
  int ret;

  if (mtx_lock (lock) != thrd_success)
    abort ();
  ret = setlocale_null_unlocked (category, buf, bufsize);
  if (mtx_unlock (lock) != thrd_success)
    abort ();

  return ret;
}

# endif

#endif

int
setlocale_null_r (int category, char *buf, size_t bufsize)
{
#if SETLOCALE_NULL_ALL_MTSAFE
# if SETLOCALE_NULL_ONE_MTSAFE

  return setlocale_null_unlocked (category, buf, bufsize);

# else

  if (category == LC_ALL)
    return setlocale_null_unlocked (category, buf, bufsize);
  else
    return setlocale_null_with_lock (category, buf, bufsize);

# endif
#else
# if SETLOCALE_NULL_ONE_MTSAFE

  if (category == LC_ALL)
    return setlocale_null_with_lock (category, buf, bufsize);
  else
    return setlocale_null_unlocked (category, buf, bufsize);

# else

  return setlocale_null_with_lock (category, buf, bufsize);

# endif
#endif
}

const char *
setlocale_null (int category)
{
#if SETLOCALE_NULL_ALL_MTSAFE && SETLOCALE_NULL_ONE_MTSAFE
  return setlocale_null_androidfix (category);
#else

  /* This call must be multithread-safe.  To achieve this without using
     thread-local storage:
       1. We use a specific static buffer for each possible CATEGORY
          argument.  So that different threads can call setlocale_mtsafe
          with different CATEGORY 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 (category == LC_ALL)
    {
# if SETLOCALE_NULL_ALL_MTSAFE
      return setlocale_null_androidfix (LC_ALL);
# else
      char buf[SETLOCALE_NULL_ALL_MAX];
      static char resultbuf[SETLOCALE_NULL_ALL_MAX];

      if (setlocale_null_r (LC_ALL, buf, sizeof (buf)))
        return "C";
      strcpy (resultbuf, buf);
      return resultbuf;
# endif
    }
  else
    {
# if SETLOCALE_NULL_ONE_MTSAFE
      return setlocale_null_androidfix (category);
# else
      enum
        {
          LC_CTYPE_INDEX,
          LC_NUMERIC_INDEX,
          LC_TIME_INDEX,
          LC_COLLATE_INDEX,
          LC_MONETARY_INDEX,
          LC_MESSAGES_INDEX,
#  ifdef LC_PAPER
          LC_PAPER_INDEX,
#  endif
#  ifdef LC_NAME
          LC_NAME_INDEX,
#  endif
#  ifdef LC_ADDRESS
          LC_ADDRESS_INDEX,
#  endif
#  ifdef LC_TELEPHONE
          LC_TELEPHONE_INDEX,
#  endif
#  ifdef LC_MEASUREMENT
          LC_MEASUREMENT_INDEX,
#  endif
#  ifdef LC_IDENTIFICATION
          LC_IDENTIFICATION_INDEX,
#  endif
          LC_INDICES_COUNT
        }
        i;
      char buf[SETLOCALE_NULL_MAX];
      static char resultbuf[LC_INDICES_COUNT][SETLOCALE_NULL_MAX];
      int err;

      err = setlocale_null_r (category, buf, sizeof (buf));
      if (err == EINVAL)
        return NULL;
      if (err)
        return "C";

      switch (category)
        {
        case LC_CTYPE:          i = LC_CTYPE_INDEX;          break;
        case LC_NUMERIC:        i = LC_NUMERIC_INDEX;        break;
        case LC_TIME:           i = LC_TIME_INDEX;           break;
        case LC_COLLATE:        i = LC_COLLATE_INDEX;        break;
        case LC_MONETARY:       i = LC_MONETARY_INDEX;       break;
        case LC_MESSAGES:       i = LC_MESSAGES_INDEX;       break;
#  ifdef LC_PAPER
        case LC_PAPER:          i = LC_PAPER_INDEX;          break;
#  endif
#  ifdef LC_NAME
        case LC_NAME:           i = LC_NAME_INDEX;           break;
#  endif
#  ifdef LC_ADDRESS
        case LC_ADDRESS:        i = LC_ADDRESS_INDEX;        break;
#  endif
#  ifdef LC_TELEPHONE
        case LC_TELEPHONE:      i = LC_TELEPHONE_INDEX;      break;
#  endif
#  ifdef LC_MEASUREMENT
        case LC_MEASUREMENT:    i = LC_MEASUREMENT_INDEX;    break;
#  endif
#  ifdef LC_IDENTIFICATION
        case LC_IDENTIFICATION: i = LC_IDENTIFICATION_INDEX; break;
#  endif
        default:
          /* If you get here, a #ifdef LC_xxx is missing.  */
          abort ();
        }

      strcpy (resultbuf[i], buf);
      return resultbuf[i];
# endif
    }
#endif
}