summary refs log tree commit diff
path: root/locale/setlocale.c
blob: c1b8c3faeceef8cc772a05c77f8cb2e4d7e1ff93 (plain) (blame)
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
/* Copyright (C) 1991, 1992, 1995-2000, 2002, 2003, 2004, 2006
   Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library 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.

   The GNU C Library 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 the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#include <alloca.h>
#include <argz.h>
#include <errno.h>
#include <bits/libc-lock.h>
#include <locale.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "localeinfo.h"

#ifdef NL_CURRENT_INDIRECT

/* For each category declare a special external symbol
   _nl_current_CATEGORY_used with a weak reference.
   This symbol will is defined in lc-CATEGORY.c and will be linked in
   if anything uses _nl_current_CATEGORY (also defined in that module).
   Also use a weak reference for the _nl_current_CATEGORY thread variable.  */

# define DEFINE_CATEGORY(category, category_name, items, a) \
    extern char _nl_current_##category##_used; \
    weak_extern (_nl_current_##category##_used) \
    weak_extern (_nl_current_##category)
# include "categories.def"
# undef	DEFINE_CATEGORY

/* Now define a table of flags based on those special weak symbols' values.
   _nl_current_used[CATEGORY] will be zero if _nl_current_CATEGORY is not
   linked in.  */
static char *const _nl_current_used[] =
  {
# define DEFINE_CATEGORY(category, category_name, items, a) \
    [category] = &_nl_current_##category##_used,
# include "categories.def"
# undef	DEFINE_CATEGORY
  };

# define CATEGORY_USED(category)	(_nl_current_used[category] != 0)

#else

/* The shared library always loads all the categories,
   and the current global settings are kept in _nl_global_locale.  */

# define CATEGORY_USED(category)	(1)

#endif


/* Define an array of category names (also the environment variable names).  */
const union catnamestr_t _nl_category_names attribute_hidden =
  {
    {
#define DEFINE_CATEGORY(category, category_name, items, a) \
      category_name,
#include "categories.def"
#undef DEFINE_CATEGORY
    }
  };

const uint8_t _nl_category_name_idxs[__LC_LAST] attribute_hidden =
  {
#define DEFINE_CATEGORY(category, category_name, items, a) \
    [category] = offsetof (union catnamestr_t, CATNAMEMF (__LINE__)),
#include "categories.def"
#undef DEFINE_CATEGORY
  };

/* An array of their lengths, for convenience.  */
const uint8_t _nl_category_name_sizes[] attribute_hidden =
  {
#define DEFINE_CATEGORY(category, category_name, items, a) \
    [category] = sizeof (category_name) - 1,
#include "categories.def"
#undef	DEFINE_CATEGORY
    [LC_ALL] = sizeof ("LC_ALL") - 1
  };


#ifdef NL_CURRENT_INDIRECT
# define WEAK_POSTLOAD(postload) weak_extern (postload)
#else
# define WEAK_POSTLOAD(postload) /* Need strong refs in static linking.  */
#endif

/* Declare the postload functions used below.  */
#undef	NO_POSTLOAD
#define NO_POSTLOAD _nl_postload_ctype /* Harmless thing known to exist.  */
#define DEFINE_CATEGORY(category, category_name, items, postload) \
extern void postload (void); WEAK_POSTLOAD (postload)
#include "categories.def"
#undef	DEFINE_CATEGORY
#undef	NO_POSTLOAD

/* Define an array indexed by category of postload functions to call after
   loading and installing that category's data.  */
static void (*const _nl_category_postload[]) (void) =
  {
#define DEFINE_CATEGORY(category, category_name, items, postload) \
    [category] = postload,
#include "categories.def"
#undef	DEFINE_CATEGORY
  };


/* Lock for protecting global data.  */
__libc_lock_define_initialized (, __libc_setlocale_lock attribute_hidden)

/* Defined in loadmsgcat.c.  */
extern int _nl_msg_cat_cntr;


/* Use this when we come along an error.  */
#define ERROR_RETURN							      \
  do {									      \
    __set_errno (EINVAL);						      \
    return NULL;							      \
  } while (0)


/* Construct a new composite name.  */
static char *
new_composite_name (int category, const char *newnames[__LC_LAST])
{
  size_t last_len = 0;
  size_t cumlen = 0;
  int i;
  char *new, *p;
  int same = 1;

  for (i = 0; i < __LC_LAST; ++i)
    if (i != LC_ALL)
      {
	const char *name = (category == LC_ALL ? newnames[i] :
			    category == i ? newnames[0] :
			    _nl_global_locale.__names[i]);
	last_len = strlen (name);
	cumlen += _nl_category_name_sizes[i] + 1 + last_len + 1;
	if (i > 0 && same && strcmp (name, newnames[0]) != 0)
	  same = 0;
      }

  if (same)
    {
      /* All the categories use the same name.  */
      if (strcmp (newnames[0], _nl_C_name) == 0
	  || strcmp (newnames[0], _nl_POSIX_name) == 0)
	return (char *) _nl_C_name;

      new = malloc (last_len + 1);

      return new == NULL ? NULL : memcpy (new, newnames[0], last_len + 1);
    }

  new = malloc (cumlen);
  if (new == NULL)
    return NULL;
  p = new;
  for (i = 0; i < __LC_LAST; ++i)
    if (i != LC_ALL)
      {
	/* Add "CATEGORY=NAME;" to the string.  */
	const char *name = (category == LC_ALL ? newnames[i] :
			    category == i ? newnames[0] :
			    _nl_global_locale.__names[i]);
	p = __stpcpy (p, _nl_category_names.str + _nl_category_name_idxs[i]);
	*p++ = '=';
	p = __stpcpy (p, name);
	*p++ = ';';
      }
  p[-1] = '\0';		/* Clobber the last ';'.  */
  return new;
}


/* Put NAME in _nl_global_locale.__names.  */
static inline void
setname (int category, const char *name)
{
  if (_nl_global_locale.__names[category] == name)
    return;

  if (_nl_global_locale.__names[category] != _nl_C_name)
    free ((char *) _nl_global_locale.__names[category]);

  _nl_global_locale.__names[category] = name;
}

/* Put DATA in *_nl_current[CATEGORY].  */
static inline void
setdata (int category, struct locale_data *data)
{
  if (CATEGORY_USED (category))
    {
      _nl_global_locale.__locales[category] = data;
      if (_nl_category_postload[category])
	(*_nl_category_postload[category]) ();
    }
}

char *
setlocale (int category, const char *locale)
{
  char *locale_path;
  size_t locale_path_len;
  const char *locpath_var;
  char *composite;

  /* Sanity check for CATEGORY argument.  */
  if (__builtin_expect (category, 0) < 0
      || __builtin_expect (category, 0) >= __LC_LAST)
    ERROR_RETURN;

  /* Does user want name of current locale?  */
  if (locale == NULL)
    return (char *) _nl_global_locale.__names[category];

  if (strcmp (locale, _nl_global_locale.__names[category]) == 0)
    /* Changing to the same thing.  */
    return (char *) _nl_global_locale.__names[category];

  /* We perhaps really have to load some data.  So we determine the
     path in which to look for the data now.  The environment variable
     `LOCPATH' must only be used when the binary has no SUID or SGID
     bit set.  If using the default path, we tell _nl_find_locale
     by passing null and it can check the canonical locale archive.  */
  locale_path = NULL;
  locale_path_len = 0;

  locpath_var = getenv ("LOCPATH");
  if (locpath_var != NULL && locpath_var[0] != '\0')
    {
      if (__argz_create_sep (locpath_var, ':',
			     &locale_path, &locale_path_len) != 0)
	return NULL;

      if (__argz_add_sep (&locale_path, &locale_path_len,
			  _nl_default_locale_path, ':') != 0)
	return NULL;
    }

  if (category == LC_ALL)
    {
      /* The user wants to set all categories.  The desired locales
	 for the individual categories can be selected by using a
	 composite locale name.  This is a semi-colon separated list
	 of entries of the form `CATEGORY=VALUE'.  */
      const char *newnames[__LC_LAST];
      struct locale_data *newdata[__LC_LAST];

      /* Set all name pointers to the argument name.  */
      for (category = 0; category < __LC_LAST; ++category)
	if (category != LC_ALL)
	  newnames[category] = (char *) locale;

      if (__builtin_expect (strchr (locale, ';') != NULL, 0))
	{
	  /* This is a composite name.  Make a copy and split it up.  */
	  char *np = strdupa (locale);
	  char *cp;
	  int cnt;

	  while ((cp = strchr (np, '=')) != NULL)
	    {
	      for (cnt = 0; cnt < __LC_LAST; ++cnt)
		if (cnt != LC_ALL
		    && (size_t) (cp - np) == _nl_category_name_sizes[cnt]
		    && (memcmp (np, (_nl_category_names.str
				     + _nl_category_name_idxs[cnt]), cp - np)
			== 0))
		  break;

	      if (cnt == __LC_LAST)
		/* Bogus category name.  */
		ERROR_RETURN;

	      /* Found the category this clause sets.  */
	      newnames[cnt] = ++cp;
	      cp = strchr (cp, ';');
	      if (cp != NULL)
		{
		  /* Examine the next clause.  */
		  *cp = '\0';
		  np = cp + 1;
		}
	      else
		/* This was the last clause.  We are done.  */
		break;
	    }

	  for (cnt = 0; cnt < __LC_LAST; ++cnt)
	    if (cnt != LC_ALL && newnames[cnt] == locale)
	      /* The composite name did not specify all categories.  */
	      ERROR_RETURN;
	}

      /* Protect global data.  */
      __libc_lock_lock (__libc_setlocale_lock);

      /* Load the new data for each category.  */
      while (category-- > 0)
	if (category != LC_ALL)
	  {
	    newdata[category] = _nl_find_locale (locale_path, locale_path_len,
						 category,
						 &newnames[category]);

	    if (newdata[category] == NULL)
	      {
#ifdef NL_CURRENT_INDIRECT
		if (newnames[category] == _nl_C_name)
		  /* Null because it's the weak value of _nl_C_LC_FOO.  */
		  continue;
#endif
		break;
	      }

	    /* We must not simply free a global locale since we have
	       no control over the usage.  So we mark it as
	       un-deletable.  And yes, the 'if' is needed, the data
	       might be in read-only memory.  */
	    if (newdata[category]->usage_count != UNDELETABLE)
	      newdata[category]->usage_count = UNDELETABLE;

	    /* Make a copy of locale name.  */
	    if (newnames[category] != _nl_C_name)
	      {
		if (strcmp (newnames[category],
			    _nl_global_locale.__names[category]) == 0)
		  newnames[category] = _nl_global_locale.__names[category];
		else
		  {
		    newnames[category] = __strdup (newnames[category]);
		    if (newnames[category] == NULL)
		      break;
		  }
	      }
	  }

      /* Create new composite name.  */
      composite = (category >= 0
		   ? NULL : new_composite_name (LC_ALL, newnames));
      if (composite != NULL)
	{
	  /* Now we have loaded all the new data.  Put it in place.  */
	  for (category = 0; category < __LC_LAST; ++category)
	    if (category != LC_ALL)
	      {
		setdata (category, newdata[category]);
		setname (category, newnames[category]);
	      }
	  setname (LC_ALL, composite);

	  /* We successfully loaded a new locale.  Let the message catalog
	     functions know about this.  */
	  ++_nl_msg_cat_cntr;
	}
      else
	for (++category; category < __LC_LAST; ++category)
	  if (category != LC_ALL && newnames[category] != _nl_C_name
	      && newnames[category] != _nl_global_locale.__names[category])
	    free ((char *) newnames[category]);

      /* Critical section left.  */
      __libc_lock_unlock (__libc_setlocale_lock);

      /* Free the resources (the locale path variable).  */
      free (locale_path);

      return composite;
    }
  else
    {
      struct locale_data *newdata = NULL;
      const char *newname[1] = { locale };

      /* Protect global data.  */
      __libc_lock_lock (__libc_setlocale_lock);

      if (CATEGORY_USED (category))
	{
	  /* Only actually load the data if anything will use it.  */
	  newdata = _nl_find_locale (locale_path, locale_path_len, category,
				     &newname[0]);
	  if (newdata == NULL)
	    goto abort_single;

	  /* We must not simply free a global locale since we have no
	     control over the usage.  So we mark it as un-deletable.

	     Note: do not remove the `if', it's necessary to copy with
	     the builtin locale data.  */
	  if (newdata->usage_count != UNDELETABLE)
	    newdata->usage_count = UNDELETABLE;
	}

      /* Make a copy of locale name.  */
      if (newname[0] != _nl_C_name)
	{
	  newname[0] = __strdup (newname[0]);
	  if (newname[0] == NULL)
	    goto abort_single;
	}

      /* Create new composite name.  */
      composite = new_composite_name (category, newname);
      if (composite == NULL)
	{
	  if (newname[0] != _nl_C_name)
	    free ((char *) newname[0]);

	  /* Say that we don't have any data loaded.  */
	abort_single:
	  newname[0] = NULL;
	}
      else
	{
	  if (CATEGORY_USED (category))
	    setdata (category, newdata);

	  setname (category, newname[0]);
	  setname (LC_ALL, composite);

	  /* We successfully loaded a new locale.  Let the message catalog
	     functions know about this.  */
	  ++_nl_msg_cat_cntr;
	}

      /* Critical section left.  */
      __libc_lock_unlock (__libc_setlocale_lock);

      /* Free the resources (the locale path variable.  */
      free (locale_path);

      return (char *) newname[0];
    }
}
libc_hidden_def (setlocale)

static void __libc_freeres_fn_section
free_category (int category,
	       struct locale_data *here, struct locale_data *c_data)
{
  struct loaded_l10nfile *runp = _nl_locale_file_list[category];

  /* If this category is already "C" don't do anything.  */
  if (here != c_data)
    {
      /* We have to be prepared that sometime later we still
	 might need the locale information.  */
      setdata (category, c_data);
      setname (category, _nl_C_name);
    }

  while (runp != NULL)
    {
      struct loaded_l10nfile *curr = runp;
      struct locale_data *data = (struct locale_data *) runp->data;

      if (data != NULL && data != c_data)
	_nl_unload_locale (data);
      runp = runp->next;
      free ((char *) curr->filename);
      free (curr);
    }
}

/* This is called from iconv/gconv_db.c's free_mem, as locales must
   be freed before freeing gconv steps arrays.  */
void __libc_freeres_fn_section
_nl_locale_subfreeres (void)
{
#ifdef NL_CURRENT_INDIRECT
  /* We don't use the loop because we want to have individual weak
     symbol references here.  */
# define DEFINE_CATEGORY(category, category_name, items, a)		      \
  if (CATEGORY_USED (category))						      \
    {									      \
      extern struct locale_data _nl_C_##category;			      \
      weak_extern (_nl_C_##category)					      \
      free_category (category, *_nl_current_##category, &_nl_C_##category);   \
    }
# include "categories.def"
# undef	DEFINE_CATEGORY
#else
  int category;

  for (category = 0; category < __LC_LAST; ++category)
    if (category != LC_ALL)
      free_category (category, _NL_CURRENT_DATA (category),
		     _nl_C_locobj.__locales[category]);
#endif

  setname (LC_ALL, _nl_C_name);

  /* This frees the data structures associated with the locale archive.
     The locales from the archive are not in the file list, so we have
     not called _nl_unload_locale on them above.  */
  _nl_archive_subfreeres ();
}