1 /* Copyright (C) 1996, 1997, 1998 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper, <drepper@gnu.ai.mit.edu>.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Library General Public License as
7 published by the Free Software Foundation; either version 2 of the
8 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 Library General Public License for more details.
15 You should have received a copy of the GNU Library General Public
16 License along with the GNU C Library; see the file COPYING.LIB. If not,
17 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA. */
30 #include "catgetsinfo.h"
33 #define SWAPU32(w) bswap_32 (w)
37 __open_catalog (__nl_catd catalog)
47 /* Make sure we are alone. */
48 __libc_lock_lock (catalog->lock);
50 /* Check whether there was no other thread faster. */
51 if (catalog->status != closed)
52 /* While we waited some other thread tried to open the catalog. */
55 if (strchr (catalog->cat_name, '/') != NULL || catalog->nlspath == NULL)
56 fd = __open (catalog->cat_name, O_RDONLY);
59 const char *run_nlspath = catalog->nlspath;
61 if (bufact + (n) >=bufmax) \
63 char *old_buf = buf; \
64 bufmax += 256 + (n); \
65 buf = (char *) alloca (bufmax); \
66 memcpy (buf, old_buf, bufact); \
69 /* The RUN_NLSPATH variable contains a colon separated list of
70 descriptions where we expect to find catalogs. We have to
71 recognize certain % substitutions and stop when we found the
72 first existing file. */
82 while (*run_nlspath != '\0')
85 while (*run_nlspath != ':' && *run_nlspath != '\0')
86 if (*run_nlspath == '%')
90 ++run_nlspath; /* We have seen the `%'. */
91 switch (*run_nlspath++)
94 /* Use the catalog name. */
95 len = strlen (catalog->cat_name);
97 memcpy (&buf[bufact], catalog->cat_name, len);
101 /* Use the current locale category value. */
102 len = strlen (catalog->env_var);
104 memcpy (&buf[bufact], catalog->env_var, len);
108 /* Use language element of locale category value. */
109 tmp = catalog->env_var;
113 buf[bufact++] = *tmp++;
115 while (*tmp != '\0' && *tmp != '_' && *tmp != '.');
118 /* Use territory element of locale category value. */
119 tmp = catalog->env_var;
122 while (*tmp != '\0' && *tmp != '_' && *tmp != '.');
129 buf[bufact++] = *tmp;
131 while (*tmp != '\0' && *tmp != '.');
135 /* Use code set element of locale category value. */
136 tmp = catalog->env_var;
139 while (*tmp != '\0' && *tmp != '.');
146 buf[bufact++] = *tmp;
148 while (*tmp != '\0');
156 /* Unknown variable: ignore this path element. */
158 while (*run_nlspath != '\0' && *run_nlspath != ':')
166 buf[bufact++] = *run_nlspath++;
173 fd = __open (buf, O_RDONLY);
182 /* Avoid dealing with directories and block devices */
183 if (fd < 0 || __fstat (fd, &st) < 0)
185 catalog->status = nonexisting;
188 if (!S_ISREG (st.st_mode) || st.st_size < sizeof (struct catalog_obj))
190 /* `errno' is not set correctly but the file is not usable.
191 Use an reasonable error value. */
192 __set_errno (EINVAL);
193 catalog->status = nonexisting;
198 /* Linux seems to lack read-only copy-on-write. */
199 # define MAP_COPY MAP_PRIVATE
202 /* Some systems do not have this flag; it is superfluous. */
206 /* Some systems might lack this; they lose. */
207 # define MAP_INHERIT 0
209 catalog->file_size = st.st_size;
211 (struct catalog_obj *) __mmap (NULL, st.st_size, PROT_READ,
212 MAP_FILE|MAP_COPY|MAP_INHERIT, fd, 0);
213 if (catalog->file_ptr != (struct catalog_obj *) MAP_FAILED)
214 /* Tell the world we managed to mmap the file. */
215 catalog->status = mmapped;
218 /* mmap failed perhaps because the system call is not
219 implemented. Try to load the file. */
221 catalog->file_ptr = malloc (st.st_size);
222 if (catalog->file_ptr == NULL)
224 catalog->status = nonexisting;
228 /* Save read, handle partial reads. */
231 size_t now = __read (fd, (((char *) &catalog->file_ptr)
232 + (st.st_size - todo)), todo);
235 free ((void *) catalog->file_ptr);
236 catalog->status = nonexisting;
242 catalog->status = malloced;
245 /* We don't need the file anymore. */
249 /* Determine whether the file is a catalog file and if yes whether
250 it is written using the correct byte order. Else we have to swap
252 if (catalog->file_ptr->magic == CATGETS_MAGIC)
254 else if (catalog->file_ptr->magic == SWAPU32 (CATGETS_MAGIC))
259 /* Invalid file. Free the resources and mark catalog as not
261 if (catalog->status == mmapped)
262 __munmap ((void *) catalog->file_ptr, catalog->file_size);
264 free (catalog->file_ptr);
265 catalog->status = nonexisting;
269 #define SWAP(x) (swapping ? SWAPU32 (x) : (x))
271 /* Get dimensions of the used hashing table. */
272 catalog->plane_size = SWAP (catalog->file_ptr->plane_size);
273 catalog->plane_depth = SWAP (catalog->file_ptr->plane_depth);
275 /* The file contains two versions of the pointer tables. Pick the
276 right one for the local byte order. */
277 #if __BYTE_ORDER == __LITTLE_ENDIAN
278 catalog->name_ptr = &catalog->file_ptr->name_ptr[0];
279 #elif __BYTE_ORDER == __BIG_ENDIAN
280 catalog->name_ptr = &catalog->file_ptr->name_ptr[catalog->plane_size
281 * catalog->plane_depth
284 # error Cannot handle __BYTE_ORDER byte order
287 /* The rest of the file contains all the strings. They are
288 addressed relative to the position of the first string. */
290 (const char *) &catalog->file_ptr->name_ptr[catalog->plane_size
291 * catalog->plane_depth * 3 * 2];
293 /* Determine the largest string offset mentioned in the table. */
295 tab_size = 3 * catalog->plane_size * catalog->plane_depth;
296 for (cnt = 2; cnt < tab_size; cnt += 3)
297 if (catalog->name_ptr[cnt] > max_offset)
298 max_offset = catalog->name_ptr[cnt];
300 /* Now we can check whether the file is large enough to contain the
301 tables it says it contains. */
302 if (st.st_size <= (sizeof (struct catalog_obj) + 2 * tab_size + max_offset))
303 /* The last string is not contained in the file. */
306 lastp = catalog->strings + max_offset;
307 max_offset = (st.st_size
308 - sizeof (struct catalog_obj) + 2 * tab_size + max_offset);
309 while (*lastp != '\0')
311 if (--max_offset == 0)
316 /* Release the lock again. */
320 __libc_lock_unlock (catalog->lock);