about summary refs log tree commit diff
path: root/locale/setlocale.c
blob: 4eeb5b3bcec5c27818f0e9da1260e1f1c378a566 (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
/* Copyright (C) 1991, 1992, 1995, 1996 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 Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.

You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB.  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 <libc-lock.h>
#include <locale.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "localeinfo.h"

/* For each category declare two external variables (with weak references):
     extern const struct locale_data *_nl_current_CATEGORY;
   This points to the current locale's in-core data for CATEGORY.
     extern const struct locale_data _nl_C_CATEGORY;
   This contains the built-in "C"/"POSIX" locale's data for CATEGORY.
   Both are weak references; if &_nl_current_CATEGORY is zero,
   then nothing is using the locale data.  */
#define DEFINE_CATEGORY(category, category_name, items, a, b, c, d) \
extern const struct locale_data *_nl_current_##category;		      \
extern const struct locale_data _nl_C_##category;			      \
weak_extern (_nl_current_##category) weak_extern (_nl_C_##category)
#include "categories.def"
#undef	DEFINE_CATEGORY

/* Array indexed by category of pointers to _nl_current_CATEGORY slots.
   Elements are zero for categories whose data is never used.  */
static const struct locale_data * *const _nl_current[] =
  {
#define DEFINE_CATEGORY(category, category_name, items, a, b, c, d) \
    [category] = &_nl_current_##category,
#include "categories.def"
#undef	DEFINE_CATEGORY
  };

/* Array indexed by category of pointers to _nl_C_CATEGORY slots.
   Elements are zero for categories whose data is never used.  */
const struct locale_data *const _nl_C[] =
  {
#define DEFINE_CATEGORY(category, category_name, items, a, b, c, d) \
    [category] = &_nl_C_##category,
#include "categories.def"
#undef	DEFINE_CATEGORY
  };


/* Define an array of category names (also the environment variable names),
   indexed by integral category.  */
const char *const _nl_category_names[] =
  {
#define DEFINE_CATEGORY(category, category_name, items, a, b, c, d) \
    [category] = category_name,
#include "categories.def"
#undef	DEFINE_CATEGORY
    [LC_ALL] = "LC_ALL"
  };
/* An array of their lengths, for convenience.  */
const size_t _nl_category_name_sizes[] =
  {
#define DEFINE_CATEGORY(category, category_name, items, a, b, c, d) \
    [category] = sizeof (category_name) - 1,
#include "categories.def"
#undef	DEFINE_CATEGORY
    [LC_ALL] = sizeof ("LC_ALL") - 1
  };


/* 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, b, c, d) \
extern void postload (void);
#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, b, c, d) \
    [category] = postload,
#include "categories.def"
#undef	DEFINE_CATEGORY
  };


/* Name of current locale for each individual category.
   Each is malloc'd unless it is nl_C_name.  */
static const char *_nl_current_names[] =
  {
#define DEFINE_CATEGORY(category, category_name, items, a, b, c, d) \
    [category] = _nl_C_name,
#include "categories.def"
#undef	DEFINE_CATEGORY
    [LC_ALL] = _nl_C_name		/* For LC_ALL.  */
  };


/* Lock for protecting global data.  */
__libc_lock_define_initialized (static, lock)


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


static inline char *
clever_copy (const char *string)
{
  size_t len;
  char *new;

  if (strcmp (string, "C") == 0 || strcmp (string, "POSIX") == 0)
    /* This return is dangerous because the returned string might be
       placed in read-only memory.  But everything should be set up to
       handle this case.  */
    return (char *) _nl_C_name;

  len = strlen (string) + 1;
  new = (char *) malloc (len);
  return new != NULL ? memcpy (new, string, len) : NULL;
}


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

  for (i = 0; i < LC_ALL; ++i)
    {
      char *name = (category == LC_ALL ? newnames[i] :
		    category == i ? newnames[0] :
		    (char *) _nl_current_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], "C") == 0 || strcmp (newnames[0], "POSIX") == 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_ALL; ++i)
    {
      /* Add "CATEGORY=NAME;" to the string.  */
      char *name = (category == LC_ALL ? newnames[i] :
		    category == i ? newnames[0] :
		    (char *) _nl_current_names[i]);
      p = __stpcpy (p, _nl_category_names[i]);
      *p++ = '=';
      p = __stpcpy (p, name);
      *p++ = ';';
    }
  p[-1] = '\0';		/* Clobber the last ';'.  */
  return new;
}


/* Put NAME in _nl_current_names.  */
static inline void
setname (int category, const char *name)
{
  if (_nl_current[category] == NULL
      && _nl_current_names[category] != _nl_C_name)
    free ((void *) _nl_current_names[category]);

  _nl_current_names[category] = name;
}


/* Put DATA in *_nl_current[CATEGORY].  */
static inline void
setdata (int category, const struct locale_data *data)
{
  if (_nl_current[category] != NULL)
    {
      *_nl_current[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;
  char *composite;

  /* Sanity check for CATEGORY argument.  */
  if (category < 0 || category > LC_ALL)
    ERROR_RETURN;

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

  if (strcmp (locale, _nl_current_names[category]) == 0)
    /* Changing to the same thing.  */
    return (char *) _nl_current_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.  */
  locale_path = NULL;
  locale_path_len = 0;

  if (!__libc_enable_secure)
    {
      char *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_append (&locale_path, &locale_path_len,
		     LOCALE_PATH, sizeof (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'.  */
      char *newnames[LC_ALL];
      const struct locale_data *newdata[LC_ALL];

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

      if (strchr (locale, ';') != NULL)
	{
	  /* 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_ALL; ++cnt)
		if ((size_t) (cp - np) == _nl_category_name_sizes[cnt]
		    && memcmp (np, _nl_category_names[cnt], cp - np) == 0)
		  break;

	      if (cnt == LC_ALL)
		/* 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_ALL; ++cnt)
	    if (newnames[cnt] == locale)
	      /* The composite name did not specify all categories.  */
	      ERROR_RETURN;
	}

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

      /* Load the new data for each category.  */
      while (category-- > 0)
	/* Only actually load the data if anything will use it.  */
	if (_nl_current[category] != NULL)
	  {
	    newdata[category] = _nl_find_locale (locale_path, locale_path_len,
						 category,
						 &newnames[category]);

	    if (newdata[category] == NULL)
	      goto abort_composite;
	  }
	else
	  {
	    /* The data is never used; just change the name.  */
	    newnames[category] = clever_copy (newnames[category]);
	    if (newnames[category] == NULL)
	      goto abort_composite;
	  }

      /* Create new composite name.  */
      composite = new_composite_name (LC_ALL, newnames);
      if (composite == NULL)
	{
	  /* Loading this part of the locale failed.  Abort the
	     composite load.  */
	  int save_errno;

	  category = -1;
	abort_composite:
	  save_errno = errno;

	  while (++category < LC_ALL)
	    if (_nl_current[category] != NULL
		&& newdata[category] != _nl_C[category])
	      _nl_free_locale (newdata[category]);
	    else
	      if (_nl_current[category] == NULL
		  && newnames[category] != _nl_C_name)
		free (newnames[category]);

	  errno = save_errno;
	  composite = NULL;
	}
      else
	{
	  /* Now we have loaded all the new data.  Put it in place.  */
	  for (category = 0; category < LC_ALL; ++category)
	    {
	      setdata (category, newdata[category]);
	      setname (category, newnames[category]);
	    }
	  setname (LC_ALL, composite);
	}

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

      return composite;
    }
  else
    {
      const struct locale_data *newdata = NULL;
      char *newname = NULL;

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

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

      /* Create new composite name.  */
      composite = new_composite_name (category, &newname);
      if (composite == NULL)
	{
	  /* If anything went wrong free what we managed to allocate
	     so far.  */
	  int save_errno = errno;

	  if (_nl_current[category] != NULL)
	    _nl_free_locale (newdata);

	  errno = save_errno;
	abort_single:
	  newname = NULL;
	}
      else
	{
	  if (_nl_current[category] != NULL)
	    setdata (category, newdata);

	  setname (category, newname);
	  setname (LC_ALL, composite);
	}

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

      return newname;
    }
}