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[glibc/history.git] / locale / findlocale.c
blobea24170df516c69c747845ce5d34795e82da590e
1 /* Copyright (C) 1996-2001, 2002, 2003, 2006 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
18 02111-1307 USA. */
20 #include <assert.h>
21 #include <locale.h>
22 #include <stdlib.h>
23 #include <string.h>
24 #include <unistd.h>
25 #ifdef _POSIX_MAPPED_FILES
26 # include <sys/mman.h>
27 #endif
29 #include "localeinfo.h"
30 #include "../iconv/gconv_charset.h"
31 #include "../iconv/gconv_int.h"
34 #ifdef NL_CURRENT_INDIRECT
35 # define DEFINE_CATEGORY(category, category_name, items, a) \
36 extern struct locale_data _nl_C_##category; \
37 weak_extern (_nl_C_##category)
38 # include "categories.def"
39 # undef DEFINE_CATEGORY
41 /* Array indexed by category of pointers to _nl_C_CATEGORY slots.
42 Elements are zero for categories whose data is never used. */
43 struct locale_data *const _nl_C[] attribute_hidden =
45 # define DEFINE_CATEGORY(category, category_name, items, a) \
46 [category] = &_nl_C_##category,
47 # include "categories.def"
48 # undef DEFINE_CATEGORY
50 #else
51 # define _nl_C (_nl_C_locobj.__locales)
52 #endif
55 /* For each category we keep a list of records for the locale files
56 which are somehow addressed. */
57 struct loaded_l10nfile *_nl_locale_file_list[__LC_LAST];
59 const char _nl_default_locale_path[] attribute_hidden = LOCALEDIR;
62 struct locale_data *
63 internal_function
64 _nl_find_locale (const char *locale_path, size_t locale_path_len,
65 int category, const char **name)
67 int mask;
68 /* Name of the locale for this category. */
69 char *loc_name;
70 const char *language;
71 const char *modifier;
72 const char *territory;
73 const char *codeset;
74 const char *normalized_codeset;
75 struct loaded_l10nfile *locale_file;
77 if ((*name)[0] == '\0')
79 /* The user decides which locale to use by setting environment
80 variables. */
81 *name = getenv ("LC_ALL");
82 if (*name == NULL || (*name)[0] == '\0')
83 *name = getenv (_nl_category_names.str
84 + _nl_category_name_idxs[category]);
85 if (*name == NULL || (*name)[0] == '\0')
86 *name = getenv ("LANG");
89 if (*name == NULL || (*name)[0] == '\0'
90 || (__builtin_expect (__libc_enable_secure, 0)
91 && strchr (*name, '/') != NULL))
92 *name = (char *) _nl_C_name;
94 if (__builtin_expect (strcmp (*name, _nl_C_name), 1) == 0
95 || __builtin_expect (strcmp (*name, _nl_POSIX_name), 1) == 0)
97 /* We need not load anything. The needed data is contained in
98 the library itself. */
99 *name = (char *) _nl_C_name;
100 return _nl_C[category];
103 /* We really have to load some data. First we try the archive,
104 but only if there was no LOCPATH environment variable specified. */
105 if (__builtin_expect (locale_path == NULL, 1))
107 struct locale_data *data = _nl_load_locale_from_archive (category, name);
108 if (__builtin_expect (data != NULL, 1))
109 return data;
111 /* Nothing in the archive. Set the default path to search below. */
112 locale_path = _nl_default_locale_path;
113 locale_path_len = sizeof _nl_default_locale_path;
116 /* We really have to load some data. First see whether the name is
117 an alias. Please note that this makes it impossible to have "C"
118 or "POSIX" as aliases. */
119 loc_name = (char *) _nl_expand_alias (*name);
120 if (loc_name == NULL)
121 /* It is no alias. */
122 loc_name = (char *) *name;
124 /* Make a writable copy of the locale name. */
125 loc_name = strdupa (loc_name);
127 /* LOCALE can consist of up to four recognized parts for the XPG syntax:
129 language[_territory[.codeset]][@modifier]
131 Beside the first all of them are allowed to be missing. If the
132 full specified locale is not found, the less specific one are
133 looked for. The various part will be stripped off according to
134 the following order:
135 (1) codeset
136 (2) normalized codeset
137 (3) territory
138 (4) modifier
140 mask = _nl_explode_name (loc_name, &language, &modifier, &territory,
141 &codeset, &normalized_codeset);
143 /* If exactly this locale was already asked for we have an entry with
144 the complete name. */
145 locale_file = _nl_make_l10nflist (&_nl_locale_file_list[category],
146 locale_path, locale_path_len, mask,
147 language, territory, codeset,
148 normalized_codeset, modifier,
149 _nl_category_names.str
150 + _nl_category_name_idxs[category], 0);
152 if (locale_file == NULL)
154 /* Find status record for addressed locale file. We have to search
155 through all directories in the locale path. */
156 locale_file = _nl_make_l10nflist (&_nl_locale_file_list[category],
157 locale_path, locale_path_len, mask,
158 language, territory, codeset,
159 normalized_codeset, modifier,
160 _nl_category_names.str
161 + _nl_category_name_idxs[category], 1);
162 if (locale_file == NULL)
163 /* This means we are out of core. */
164 return NULL;
167 /* The space for normalized_codeset is dynamically allocated. Free it. */
168 if (mask & XPG_NORM_CODESET)
169 free ((void *) normalized_codeset);
171 if (locale_file->decided == 0)
172 _nl_load_locale (locale_file, category);
174 if (locale_file->data == NULL)
176 int cnt;
177 for (cnt = 0; locale_file->successor[cnt] != NULL; ++cnt)
179 if (locale_file->successor[cnt]->decided == 0)
180 _nl_load_locale (locale_file->successor[cnt], category);
181 if (locale_file->successor[cnt]->data != NULL)
182 break;
184 /* Move the entry we found (or NULL) to the first place of
185 successors. */
186 locale_file->successor[0] = locale_file->successor[cnt];
187 locale_file = locale_file->successor[cnt];
189 if (locale_file == NULL)
190 return NULL;
193 /* The LC_CTYPE category allows to check whether a locale is really
194 usable. If the locale name contains a charset name and the
195 charset name used in the locale (present in the LC_CTYPE data) is
196 not the same (after resolving aliases etc) we reject the locale
197 since using it would irritate users expecting the charset named
198 in the locale name. */
199 if (codeset != NULL)
201 /* Get the codeset information from the locale file. */
202 static const int codeset_idx[] =
204 [__LC_CTYPE] = _NL_ITEM_INDEX (CODESET),
205 [__LC_NUMERIC] = _NL_ITEM_INDEX (_NL_NUMERIC_CODESET),
206 [__LC_TIME] = _NL_ITEM_INDEX (_NL_TIME_CODESET),
207 [__LC_COLLATE] = _NL_ITEM_INDEX (_NL_COLLATE_CODESET),
208 [__LC_MONETARY] = _NL_ITEM_INDEX (_NL_MONETARY_CODESET),
209 [__LC_MESSAGES] = _NL_ITEM_INDEX (_NL_MESSAGES_CODESET),
210 [__LC_PAPER] = _NL_ITEM_INDEX (_NL_PAPER_CODESET),
211 [__LC_NAME] = _NL_ITEM_INDEX (_NL_NAME_CODESET),
212 [__LC_ADDRESS] = _NL_ITEM_INDEX (_NL_ADDRESS_CODESET),
213 [__LC_TELEPHONE] = _NL_ITEM_INDEX (_NL_TELEPHONE_CODESET),
214 [__LC_MEASUREMENT] = _NL_ITEM_INDEX (_NL_MEASUREMENT_CODESET),
215 [__LC_IDENTIFICATION] = _NL_ITEM_INDEX (_NL_IDENTIFICATION_CODESET)
217 const struct locale_data *data;
218 const char *locale_codeset;
219 char *clocale_codeset;
220 char *ccodeset;
222 data = (const struct locale_data *) locale_file->data;
223 locale_codeset =
224 (const char *) data->values[codeset_idx[category]].string;
225 assert (locale_codeset != NULL);
226 /* Note the length of the allocated memory: +3 for up to two slashes
227 and the NUL byte. */
228 clocale_codeset = (char *) alloca (strlen (locale_codeset) + 3);
229 strip (clocale_codeset, locale_codeset);
231 ccodeset = (char *) alloca (strlen (codeset) + 3);
232 strip (ccodeset, codeset);
234 if (__gconv_compare_alias (upstr (ccodeset, ccodeset),
235 upstr (clocale_codeset,
236 clocale_codeset)) != 0)
237 /* The codesets are not identical, don't use the locale. */
238 return NULL;
241 /* Determine the locale name for which loading succeeded. This
242 information comes from the file name. The form is
243 <path>/<locale>/LC_foo. We must extract the <locale> part. */
244 if (((const struct locale_data *) locale_file->data)->name == NULL)
246 char *cp, *endp;
248 endp = strrchr (locale_file->filename, '/');
249 cp = endp - 1;
250 while (cp[-1] != '/')
251 --cp;
252 ((struct locale_data *) locale_file->data)->name = __strndup (cp,
253 endp - cp);
256 /* Determine whether the user wants transliteration or not. */
257 if (modifier != NULL && __strcasecmp (modifier, "TRANSLIT") == 0)
258 ((struct locale_data *) locale_file->data)->use_translit = 1;
260 /* Increment the usage count. */
261 if (((const struct locale_data *) locale_file->data)->usage_count
262 < MAX_USAGE_COUNT)
263 ++((struct locale_data *) locale_file->data)->usage_count;
265 return (struct locale_data *) locale_file->data;
269 /* Calling this function assumes the lock for handling global locale data
270 is acquired. */
271 void
272 internal_function
273 _nl_remove_locale (int locale, struct locale_data *data)
275 if (--data->usage_count == 0)
277 if (data->alloc != ld_archive)
279 /* First search the entry in the list of loaded files. */
280 struct loaded_l10nfile *ptr = _nl_locale_file_list[locale];
282 /* Search for the entry. It must be in the list. Otherwise it
283 is a bug and we crash badly. */
284 while ((struct locale_data *) ptr->data != data)
285 ptr = ptr->next;
287 /* Mark the data as not available anymore. So when the data has
288 to be used again it is reloaded. */
289 ptr->decided = 0;
290 ptr->data = NULL;
293 /* This does the real work. */
294 _nl_unload_locale (data);