summary refs log tree commit diff
path: root/locale/findlocale.c
blob: 94f01b413248c3bfd1b6cba5927523a008854b34 (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
/* Copyright (C) 1996, 1997, 1998, 1999 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Ulrich Drepper <drepper@gnu.org>, 1996.

   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 <locale.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#ifdef _POSIX_MAPPED_FILES
# include <sys/mman.h>
#endif

#include "localeinfo.h"


/* Constant data defined in setlocale.c.  */
extern struct locale_data *const _nl_C[];


/* For each category we keep a list of records for the locale files
   which are somehow addressed.  */
static struct loaded_l10nfile *locale_file_list[LC_ALL];


struct locale_data *
_nl_find_locale (const char *locale_path, size_t locale_path_len,
		 int category, const char **name)
{
  int mask;
  /* Name of the locale for this category.  */
  char *loc_name;
  const char *language;
  const char *modifier;
  const char *territory;
  const char *codeset;
  const char *normalized_codeset;
  const char *special;
  const char *sponsor;
  const char *revision;
  struct loaded_l10nfile *locale_file;

  if ((*name)[0] == '\0'
      /* In SUID binaries we must not allow people to access files
	 outside the dedicated locale directories.  */
      || (__libc_enable_secure
	  && memchr (*name, '/', _nl_find_language (*name) - *name) != NULL))
    {
      /* The user decides which locale to use by setting environment
	 variables.  */
      *name = getenv ("LC_ALL");
      if (*name == NULL || (*name)[0] == '\0')
	*name = getenv (_nl_category_names[category]);
      if (*name == NULL || (*name)[0] == '\0')
	*name = getenv ("LANG");
      if (*name == NULL || (*name)[0] == '\0')
	*name = (char *) _nl_C_name;
    }

  if (strcmp (*name, _nl_C_name) == 0 || strcmp (*name, _nl_POSIX_name) == 0)
    {
      /* We need not load anything.  The needed data is contained in
	 the library itself.  */
      *name = (char *) _nl_C_name;
      return _nl_C[category];
    }

  /* We really have to load some data.  First see whether the name is
     an alias.  Please note that this makes it impossible to have "C"
     or "POSIX" as aliases.  */
  loc_name = (char *) _nl_expand_alias (*name);
  if (loc_name == NULL)
    /* It is no alias.  */
    loc_name = (char *) *name;

  /* Make a writable copy of the locale name.  */
  loc_name = strdupa (loc_name);

  /* LOCALE can consist of up to four recognized parts for the XPG syntax:

		language[_territory[.codeset]][@modifier]

     and six parts for the CEN syntax:

	language[_territory][+audience][+special][,[sponsor][_revision]]

     Beside the first all of them are allowed to be missing.  If the
     full specified locale is not found, the less specific one are
     looked for.  The various part will be stripped of according to
     the following order:
		(1) revision
		(2) sponsor
		(3) special
		(4) codeset
		(5) normalized codeset
		(6) territory
		(7) audience/modifier
   */
  mask = _nl_explode_name (loc_name, &language, &modifier, &territory,
			   &codeset, &normalized_codeset, &special,
			   &sponsor, &revision);

  /* If exactly this locale was already asked for we have an entry with
     the complete name.  */
  locale_file = _nl_make_l10nflist (&locale_file_list[category],
				    locale_path, locale_path_len, mask,
				    language, territory, codeset,
				    normalized_codeset, modifier, special,
				    sponsor, revision,
				    _nl_category_names[category], 0);

  if (locale_file == NULL)
    {
      /* Find status record for addressed locale file.  We have to search
	 through all directories in the locale path.  */
      locale_file = _nl_make_l10nflist (&locale_file_list[category],
					locale_path, locale_path_len, mask,
					language, territory, codeset,
					normalized_codeset, modifier, special,
					sponsor, revision,
					_nl_category_names[category], 1);
      if (locale_file == NULL)
	/* This means we are out of core.  */
	return NULL;
    }

  if (locale_file->decided == 0)
    _nl_load_locale (locale_file, category);

  if (locale_file->data == NULL)
    {
      int cnt;
      for (cnt = 0; locale_file->successor[cnt] != NULL; ++cnt)
	{
	  if (locale_file->successor[cnt]->decided == 0)
	    _nl_load_locale (locale_file->successor[cnt], category);
	  if (locale_file->successor[cnt]->data != NULL)
	    break;
	}
      /* Move the entry we found (or NULL) to the first place of
	 successors.  */
      locale_file->successor[0] = locale_file->successor[cnt];
      locale_file = locale_file->successor[cnt];
    }

  if (locale_file == NULL)
    return NULL;

  /* Determine the locale name for which loading succeeded.  This
     information comes from the file name.  The form is
     <path>/<locale>/LC_foo.  We must extract the <locale> part.  */
  if (((struct locale_data *) locale_file->data)->name == NULL)
    {
      char *cp, *endp;

      endp = strrchr (locale_file->filename, '/');
      cp = endp - 1;
      while (cp[-1] != '/')
	--cp;
      ((struct locale_data *) locale_file->data)->name = __strndup (cp,
								    endp - cp);
    }
  *name = (char *) ((struct locale_data *) locale_file->data)->name;

  /* Increment the usage count.  */
  if (((struct locale_data *) locale_file->data)->usage_count
      < MAX_USAGE_COUNT)
    ++((struct locale_data *) locale_file->data)->usage_count;

  return (struct locale_data *) locale_file->data;
}


/* Calling this function assumes the lock for handling global locale data
   is acquired.  */
void
_nl_remove_locale (int locale, struct locale_data *data)
{
  if (--data->usage_count == 0)
    {
      /* First search the entry in the list of loaded files.  */
      struct loaded_l10nfile *ptr = locale_file_list[locale];

      /* Search for the entry.  It must be in the list.  Otherwise it
	 is a bug and we crash badly.  */
      while ((struct locale_data *) ptr->data != data)
	ptr = ptr->next;

      /* Mark the data as not available anymore.  So when the data has
	 to be used again it is reloaded.  */
      ptr->decided = 0;
      ptr->data = NULL;

      /* Free the name.  */
      free ((char *) data->name);

#ifdef _POSIX_MAPPED_FILES
      /* Really delete the data.  First delete the real data.  */
      if (data->mmaped)
	{
	  /* Try to unmap the area.  If this fails we mark the area as
	     permanent.  */
	  if (__munmap ((caddr_t) data->filedata, data->filesize) != 0)
	    {
	      data->usage_count = UNDELETABLE;
	      return;
	    }
	}
      else
#endif	/* _POSIX_MAPPED_FILES */
	/* The memory was malloced.  */
	free ((void *) data->filedata);

      /* Now free the structure itself.  */
      free (data);
    }
}

static void __attribute__ ((unused))
free_mem (void)
{
  int category;

  for (category = 0; category < LC_ALL; ++category)
    {
      struct loaded_l10nfile *runp = locale_file_list[category];

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

	  if (data != NULL && data->usage_count != UNDELETABLE)
	    _nl_unload_locale (data);
	  runp = runp->next;
	  free ((char *) here->filename);
	  free (here);
	}
    }
}
text_set_element (__libc_subfreeres, free_mem);