Update.
[glibc.git] / locale / loadlocale.c
blob32faad57e9bc7f3f8bc465aec3ba0b4494d7957d
1 /* Functions to read locale data files.
2 Copyright (C) 1996-2001, 2002 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 "localeinfo.h"
36 static const size_t _nl_category_num_items[] =
38 #define DEFINE_CATEGORY(category, category_name, items, a) \
39 [category] = _NL_ITEM_INDEX (_NL_NUM_##category),
40 #include "categories.def"
41 #undef DEFINE_CATEGORY
45 #define NO_PAREN(arg, rest...) arg, ##rest
47 #define DEFINE_CATEGORY(category, category_name, items, a) \
48 static const enum value_type _nl_value_type_##category[] = { NO_PAREN items };
49 #define DEFINE_ELEMENT(element, element_name, optstd, type, rest...) \
50 [_NL_ITEM_INDEX (element)] = type,
51 #include "categories.def"
52 #undef DEFINE_CATEGORY
54 static const enum value_type *_nl_value_types[] =
56 #define DEFINE_CATEGORY(category, category_name, items, a) \
57 [category] = _nl_value_type_##category,
58 #include "categories.def"
59 #undef DEFINE_CATEGORY
63 struct locale_data *
64 internal_function
65 _nl_intern_locale_data (int category, const void *data, size_t datasize)
67 const struct
69 unsigned int magic;
70 unsigned int nstrings;
71 unsigned int strindex[0];
72 } *const filedata = data;
73 struct locale_data *newdata;
74 size_t cnt;
76 if (__builtin_expect (datasize < sizeof *filedata, 0)
77 || __builtin_expect (filedata->magic != LIMAGIC (category), 0))
79 /* Bad data file. */
80 __set_errno (EINVAL);
81 return NULL;
84 if (__builtin_expect (filedata->nstrings < _nl_category_num_items[category],
86 || (__builtin_expect (sizeof *filedata
87 + filedata->nstrings * sizeof (unsigned int)
88 >= datasize, 0)))
90 /* Insufficient data. */
91 __set_errno (EINVAL);
92 return NULL;
95 newdata = malloc (sizeof *newdata
96 + filedata->nstrings * sizeof (union locale_data_value));
97 if (newdata == NULL)
98 return NULL;
100 newdata->filedata = (void *) filedata;
101 newdata->filesize = datasize;
102 newdata->private.data = NULL;
103 newdata->private.cleanup = NULL;
104 newdata->usage_count = 0;
105 newdata->use_translit = 0;
106 newdata->nstrings = filedata->nstrings;
107 for (cnt = 0; cnt < newdata->nstrings; ++cnt)
109 size_t idx = filedata->strindex[cnt];
110 if (__builtin_expect (idx > (size_t) newdata->filesize, 0))
112 puntdata:
113 free (newdata);
114 __set_errno (EINVAL);
115 return NULL;
117 if (__builtin_expect (_nl_value_types[category][cnt] == word, 0))
119 if (idx % __alignof__ (u_int32_t) != 0)
120 goto puntdata;
121 newdata->values[cnt].word =
122 *((const u_int32_t *) (newdata->filedata + idx));
124 else
125 newdata->values[cnt].string = newdata->filedata + idx;
128 return newdata;
131 void
132 internal_function
133 _nl_load_locale (struct loaded_l10nfile *file, int category)
135 int fd;
136 void *filedata;
137 struct stat64 st;
138 struct locale_data *newdata;
139 int save_err;
140 int alloc = ld_mapped;
142 file->decided = 1;
143 file->data = NULL;
145 fd = __open (file->filename, O_RDONLY);
146 if (__builtin_expect (fd, 0) < 0)
147 /* Cannot open the file. */
148 return;
150 if (__builtin_expect (__fxstat64 (_STAT_VER, fd, &st), 0) < 0)
152 puntfd:
153 __close (fd);
154 return;
156 if (__builtin_expect (S_ISDIR (st.st_mode), 0))
158 /* LOCALE/LC_foo is a directory; open LOCALE/LC_foo/SYS_LC_foo
159 instead. */
160 char *newp;
161 size_t filenamelen;
163 __close (fd);
165 filenamelen = strlen (file->filename);
166 newp = (char *) alloca (filenamelen
167 + 5 + _nl_category_name_sizes[category] + 1);
168 __mempcpy (__mempcpy (__mempcpy (newp, file->filename, filenamelen),
169 "/SYS_", 5),
170 _nl_category_names[category],
171 _nl_category_name_sizes[category] + 1);
173 fd = __open (newp, O_RDONLY);
174 if (__builtin_expect (fd, 0) < 0)
175 return;
177 if (__builtin_expect (__fxstat64 (_STAT_VER, fd, &st), 0) < 0)
178 goto puntfd;
181 /* Map in the file's data. */
182 save_err = errno;
183 #ifdef _POSIX_MAPPED_FILES
184 # ifndef MAP_COPY
185 /* Linux seems to lack read-only copy-on-write. */
186 # define MAP_COPY MAP_PRIVATE
187 # endif
188 # ifndef MAP_FILE
189 /* Some systems do not have this flag; it is superfluous. */
190 # define MAP_FILE 0
191 # endif
192 filedata = __mmap ((caddr_t) 0, st.st_size,
193 PROT_READ, MAP_FILE|MAP_COPY, fd, 0);
194 if (__builtin_expect (filedata == MAP_FAILED, 0))
196 if (__builtin_expect (errno, ENOSYS) == ENOSYS)
198 #endif /* _POSIX_MAPPED_FILES */
199 /* No mmap; allocate a buffer and read from the file. */
200 alloc = ld_malloced;
201 filedata = malloc (st.st_size);
202 if (filedata != NULL)
204 off_t to_read = st.st_size;
205 ssize_t nread;
206 char *p = (char *) filedata;
207 while (to_read > 0)
209 nread = __read (fd, p, to_read);
210 if (__builtin_expect (nread, 1) <= 0)
212 free (filedata);
213 if (nread == 0)
214 __set_errno (EINVAL); /* Bizarreness going on. */
215 goto puntfd;
217 p += nread;
218 to_read -= nread;
220 __set_errno (save_err);
222 #ifdef _POSIX_MAPPED_FILES
225 #endif /* _POSIX_MAPPED_FILES */
227 /* We have mapped the data, so we no longer need the descriptor. */
228 __close (fd);
230 if (__builtin_expect (filedata == NULL, 0))
231 /* We failed to map or read the data. */
232 return;
234 newdata = _nl_intern_locale_data (category, filedata, st.st_size);
235 if (__builtin_expect (newdata == NULL, 0))
236 /* Bad data. */
238 #ifdef _POSIX_MAPPED_FILES
239 if (alloc == ld_mapped)
240 __munmap ((caddr_t) filedata, st.st_size);
241 #endif
242 return;
245 /* _nl_intern_locale_data leaves us these fields to initialize. */
246 newdata->name = NULL; /* This will be filled if necessary in findlocale.c. */
247 newdata->alloc = alloc;
249 file->data = newdata;
252 void
253 internal_function
254 _nl_unload_locale (struct locale_data *locale)
256 if (locale->private.cleanup)
257 (*locale->private.cleanup) (locale);
259 switch (__builtin_expect (locale->alloc, ld_mapped))
261 case ld_malloced:
262 free ((void *) locale->filedata);
263 break;
264 case ld_mapped:
265 #ifdef _POSIX_MAPPED_FILES
266 __munmap ((caddr_t) locale->filedata, locale->filesize);
267 break;
268 #endif
269 case ld_archive: /* Nothing to do. */
270 break;
273 if (__builtin_expect (locale->alloc, ld_mapped) != ld_archive)
274 free ((char *) locale->name);
276 free (locale);