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[glibc.git] / locale / loadlocale.c
blob467dff157a4ec6f0e97bceefda0274553539a891
1 /* Functions to read locale data files.
2 Copyright (C) 1996-2004, 2005, 2006 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, write to the Free
18 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
19 02111-1307 USA. */
21 #include <assert.h>
22 #include <errno.h>
23 #include <fcntl.h>
24 #include <locale.h>
25 #include <stdlib.h>
26 #include <string.h>
27 #include <unistd.h>
28 #ifdef _POSIX_MAPPED_FILES
29 # include <sys/mman.h>
30 #endif
31 #include <sys/stat.h>
33 #include <not-cancel.h>
34 #include "localeinfo.h"
37 static const size_t _nl_category_num_items[] =
39 #define DEFINE_CATEGORY(category, category_name, items, a) \
40 [category] = _NL_ITEM_INDEX (_NL_NUM_##category),
41 #include "categories.def"
42 #undef DEFINE_CATEGORY
46 #define NO_PAREN(arg, rest...) arg, ##rest
48 #define DEFINE_CATEGORY(category, category_name, items, a) \
49 static const enum value_type _nl_value_type_##category[] = { NO_PAREN items };
50 #define DEFINE_ELEMENT(element, element_name, optstd, type, rest...) \
51 [_NL_ITEM_INDEX (element)] = type,
52 #include "categories.def"
53 #undef DEFINE_CATEGORY
55 static const enum value_type *const _nl_value_types[] =
57 #define DEFINE_CATEGORY(category, category_name, items, a) \
58 [category] = _nl_value_type_##category,
59 #include "categories.def"
60 #undef DEFINE_CATEGORY
64 struct locale_data *
65 internal_function
66 _nl_intern_locale_data (int category, const void *data, size_t datasize)
68 const struct
70 unsigned int magic;
71 unsigned int nstrings;
72 unsigned int strindex[0];
73 } *const filedata = data;
74 struct locale_data *newdata;
75 size_t cnt;
77 if (__builtin_expect (datasize < sizeof *filedata, 0)
78 || __builtin_expect (filedata->magic != LIMAGIC (category), 0))
80 /* Bad data file. */
81 __set_errno (EINVAL);
82 return NULL;
85 if (__builtin_expect (filedata->nstrings < _nl_category_num_items[category],
87 || (__builtin_expect (sizeof *filedata
88 + filedata->nstrings * sizeof (unsigned int)
89 >= datasize, 0)))
91 /* Insufficient data. */
92 __set_errno (EINVAL);
93 return NULL;
96 newdata = malloc (sizeof *newdata
97 + filedata->nstrings * sizeof (union locale_data_value));
98 if (newdata == NULL)
99 return NULL;
101 newdata->filedata = (void *) filedata;
102 newdata->filesize = datasize;
103 newdata->private.data = NULL;
104 newdata->private.cleanup = NULL;
105 newdata->usage_count = 0;
106 newdata->use_translit = 0;
107 newdata->nstrings = filedata->nstrings;
108 for (cnt = 0; cnt < newdata->nstrings; ++cnt)
110 size_t idx = filedata->strindex[cnt];
111 if (__builtin_expect (idx > (size_t) newdata->filesize, 0))
113 puntdata:
114 free (newdata);
115 __set_errno (EINVAL);
116 return NULL;
119 /* Determine the type. There is one special case: the LC_CTYPE
120 category can have more elements than there are in the
121 _nl_value_type_LC_XYZ array. There are all pointers. */
122 switch (category)
124 #define CATTEST(cat) \
125 case LC_##cat: \
126 assert (cnt < (sizeof (_nl_value_type_LC_##cat) \
127 / sizeof (_nl_value_type_LC_##cat[0]))); \
128 break
129 CATTEST (NUMERIC);
130 CATTEST (TIME);
131 CATTEST (COLLATE);
132 CATTEST (MONETARY);
133 CATTEST (MESSAGES);
134 CATTEST (PAPER);
135 CATTEST (NAME);
136 CATTEST (ADDRESS);
137 CATTEST (TELEPHONE);
138 CATTEST (MEASUREMENT);
139 CATTEST (IDENTIFICATION);
140 default:
141 assert (category == LC_CTYPE);
142 break;
145 if ((category == LC_CTYPE
146 && cnt >= (sizeof (_nl_value_type_LC_CTYPE)
147 / sizeof (_nl_value_type_LC_CTYPE[0])))
148 || __builtin_expect (_nl_value_types[category][cnt] != word, 1))
149 newdata->values[cnt].string = newdata->filedata + idx;
150 else
152 if (idx % __alignof__ (u_int32_t) != 0)
153 goto puntdata;
154 newdata->values[cnt].word =
155 *((const u_int32_t *) (newdata->filedata + idx));
159 return newdata;
162 void
163 internal_function
164 _nl_load_locale (struct loaded_l10nfile *file, int category)
166 int fd;
167 void *filedata;
168 struct stat64 st;
169 struct locale_data *newdata;
170 int save_err;
171 int alloc = ld_mapped;
173 file->decided = 1;
174 file->data = NULL;
176 fd = open_not_cancel_2 (file->filename, O_RDONLY);
177 if (__builtin_expect (fd, 0) < 0)
178 /* Cannot open the file. */
179 return;
181 if (__builtin_expect (__fxstat64 (_STAT_VER, fd, &st), 0) < 0)
183 puntfd:
184 close_not_cancel_no_status (fd);
185 return;
187 if (__builtin_expect (S_ISDIR (st.st_mode), 0))
189 /* LOCALE/LC_foo is a directory; open LOCALE/LC_foo/SYS_LC_foo
190 instead. */
191 char *newp;
192 size_t filenamelen;
194 close_not_cancel_no_status (fd);
196 filenamelen = strlen (file->filename);
197 newp = (char *) alloca (filenamelen
198 + 5 + _nl_category_name_sizes[category] + 1);
199 __mempcpy (__mempcpy (__mempcpy (newp, file->filename, filenamelen),
200 "/SYS_", 5),
201 _nl_category_names.str + _nl_category_name_idxs[category],
202 _nl_category_name_sizes[category] + 1);
204 fd = open_not_cancel_2 (newp, O_RDONLY);
205 if (__builtin_expect (fd, 0) < 0)
206 return;
208 if (__builtin_expect (__fxstat64 (_STAT_VER, fd, &st), 0) < 0)
209 goto puntfd;
212 /* Map in the file's data. */
213 save_err = errno;
214 #ifdef _POSIX_MAPPED_FILES
215 # ifndef MAP_COPY
216 /* Linux seems to lack read-only copy-on-write. */
217 # define MAP_COPY MAP_PRIVATE
218 # endif
219 # ifndef MAP_FILE
220 /* Some systems do not have this flag; it is superfluous. */
221 # define MAP_FILE 0
222 # endif
223 filedata = __mmap ((caddr_t) 0, st.st_size,
224 PROT_READ, MAP_FILE|MAP_COPY, fd, 0);
225 if (__builtin_expect (filedata == MAP_FAILED, 0))
227 if (__builtin_expect (errno, ENOSYS) == ENOSYS)
229 #endif /* _POSIX_MAPPED_FILES */
230 /* No mmap; allocate a buffer and read from the file. */
231 alloc = ld_malloced;
232 filedata = malloc (st.st_size);
233 if (filedata != NULL)
235 off_t to_read = st.st_size;
236 ssize_t nread;
237 char *p = (char *) filedata;
238 while (to_read > 0)
240 nread = read_not_cancel (fd, p, to_read);
241 if (__builtin_expect (nread, 1) <= 0)
243 free (filedata);
244 if (nread == 0)
245 __set_errno (EINVAL); /* Bizarreness going on. */
246 goto puntfd;
248 p += nread;
249 to_read -= nread;
251 __set_errno (save_err);
253 #ifdef _POSIX_MAPPED_FILES
256 #endif /* _POSIX_MAPPED_FILES */
258 /* We have mapped the data, so we no longer need the descriptor. */
259 close_not_cancel_no_status (fd);
261 if (__builtin_expect (filedata == NULL, 0))
262 /* We failed to map or read the data. */
263 return;
265 newdata = _nl_intern_locale_data (category, filedata, st.st_size);
266 if (__builtin_expect (newdata == NULL, 0))
267 /* Bad data. */
269 #ifdef _POSIX_MAPPED_FILES
270 if (alloc == ld_mapped)
271 __munmap ((caddr_t) filedata, st.st_size);
272 #endif
273 return;
276 /* _nl_intern_locale_data leaves us these fields to initialize. */
277 newdata->name = NULL; /* This will be filled if necessary in findlocale.c. */
278 newdata->alloc = alloc;
280 file->data = newdata;
283 void
284 internal_function
285 _nl_unload_locale (struct locale_data *locale)
287 if (locale->private.cleanup)
288 (*locale->private.cleanup) (locale);
290 switch (__builtin_expect (locale->alloc, ld_mapped))
292 case ld_malloced:
293 free ((void *) locale->filedata);
294 break;
295 case ld_mapped:
296 #ifdef _POSIX_MAPPED_FILES
297 __munmap ((caddr_t) locale->filedata, locale->filesize);
298 break;
299 #endif
300 case ld_archive: /* Nothing to do. */
301 break;
304 if (__builtin_expect (locale->alloc, ld_mapped) != ld_archive)
305 free ((char *) locale->name);
307 free (locale);