1 /* Copyright (C) 1996-2000, 2001, 2002 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper, <drepper@gnu.org>.
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
27 #ifdef _POSIX_MAPPED_FILES
28 # include <sys/mman.h>
32 #include "catgetsinfo.h"
35 #define SWAPU32(w) bswap_32 (w)
39 __open_catalog (const char *cat_name, const char *nlspath, const char *env_var,
51 if (strchr (cat_name, '/') != NULL || nlspath == NULL)
52 fd = __open (cat_name, O_RDONLY);
55 const char *run_nlspath = nlspath;
57 if (__builtin_expect (bufact + (n) >= bufmax, 0)) \
59 char *old_buf = buf; \
60 bufmax += 256 + (n); \
61 buf = (char *) alloca (bufmax); \
62 memcpy (buf, old_buf, bufact); \
65 /* The RUN_NLSPATH variable contains a colon separated list of
66 descriptions where we expect to find catalogs. We have to
67 recognize certain % substitutions and stop when we found the
68 first existing file. */
78 while (*run_nlspath != '\0')
82 if (*run_nlspath == ':')
84 /* Leading colon or adjacent colons - treat same as %N. */
85 len = strlen (cat_name);
87 memcpy (&buf[bufact], cat_name, len);
91 while (*run_nlspath != ':' && *run_nlspath != '\0')
92 if (*run_nlspath == '%')
96 ++run_nlspath; /* We have seen the `%'. */
97 switch (*run_nlspath++)
100 /* Use the catalog name. */
101 len = strlen (cat_name);
103 memcpy (&buf[bufact], cat_name, len);
107 /* Use the current locale category value. */
108 len = strlen (env_var);
110 memcpy (&buf[bufact], env_var, len);
114 /* Use language element of locale category value. */
119 buf[bufact++] = *tmp++;
121 while (*tmp != '\0' && *tmp != '_' && *tmp != '.');
124 /* Use territory element of locale category value. */
128 while (*tmp != '\0' && *tmp != '_' && *tmp != '.');
135 buf[bufact++] = *tmp++;
137 while (*tmp != '\0' && *tmp != '.');
141 /* Use code set element of locale category value. */
145 while (*tmp != '\0' && *tmp != '.');
152 buf[bufact++] = *tmp++;
154 while (*tmp != '\0');
162 /* Unknown variable: ignore this path element. */
164 while (*run_nlspath != '\0' && *run_nlspath != ':')
172 buf[bufact++] = *run_nlspath++;
180 fd = __open (buf, O_RDONLY);
189 /* Avoid dealing with directories and block devices */
190 if (__builtin_expect (fd, 0) < 0)
193 if (__builtin_expect (__fxstat64 (_STAT_VER, fd, &st), 0) < 0)
194 goto close_unlock_return;
196 if (__builtin_expect (!S_ISREG (st.st_mode), 0)
197 || st.st_size < sizeof (struct catalog_obj))
199 /* `errno' is not set correctly but the file is not usable.
200 Use an reasonable error value. */
201 __set_errno (EINVAL);
202 goto close_unlock_return;
205 catalog->file_size = st.st_size;
206 #ifdef _POSIX_MAPPED_FILES
208 /* Linux seems to lack read-only copy-on-write. */
209 # define MAP_COPY MAP_PRIVATE
212 /* Some systems do not have this flag; it is superfluous. */
216 /* Some systems might lack this; they lose. */
217 # define MAP_INHERIT 0
220 (struct catalog_obj *) __mmap (NULL, st.st_size, PROT_READ,
221 MAP_FILE|MAP_COPY|MAP_INHERIT, fd, 0);
222 if (__builtin_expect (catalog->file_ptr != (struct catalog_obj *) MAP_FAILED,
224 /* Tell the world we managed to mmap the file. */
225 catalog->status = mmapped;
227 #endif /* _POSIX_MAPPED_FILES */
229 /* mmap failed perhaps because the system call is not
230 implemented. Try to load the file. */
232 catalog->file_ptr = malloc (st.st_size);
233 if (catalog->file_ptr == NULL)
234 goto close_unlock_return;
237 /* Save read, handle partial reads. */
240 size_t now = __read (fd, (((char *) catalog->file_ptr)
241 + (st.st_size - todo)), todo);
242 if (now == 0 || now == (size_t) -1)
245 if (now == (size_t) -1 && errno == EINTR)
248 free ((void *) catalog->file_ptr);
249 goto close_unlock_return;
254 catalog->status = malloced;
257 /* Determine whether the file is a catalog file and if yes whether
258 it is written using the correct byte order. Else we have to swap
260 if (__builtin_expect (catalog->file_ptr->magic, CATGETS_MAGIC)
263 else if (catalog->file_ptr->magic == SWAPU32 (CATGETS_MAGIC))
268 /* Invalid file. Free the resources and mark catalog as not
270 #ifdef _POSIX_MAPPED_FILES
271 if (catalog->status == mmapped)
272 __munmap ((void *) catalog->file_ptr, catalog->file_size);
274 #endif /* _POSIX_MAPPED_FILES */
275 free (catalog->file_ptr);
276 goto close_unlock_return;
279 #define SWAP(x) (swapping ? SWAPU32 (x) : (x))
281 /* Get dimensions of the used hashing table. */
282 catalog->plane_size = SWAP (catalog->file_ptr->plane_size);
283 catalog->plane_depth = SWAP (catalog->file_ptr->plane_depth);
285 /* The file contains two versions of the pointer tables. Pick the
286 right one for the local byte order. */
287 #if __BYTE_ORDER == __LITTLE_ENDIAN
288 catalog->name_ptr = &catalog->file_ptr->name_ptr[0];
289 #elif __BYTE_ORDER == __BIG_ENDIAN
290 catalog->name_ptr = &catalog->file_ptr->name_ptr[catalog->plane_size
291 * catalog->plane_depth
294 # error Cannot handle __BYTE_ORDER byte order
297 /* The rest of the file contains all the strings. They are
298 addressed relative to the position of the first string. */
300 (const char *) &catalog->file_ptr->name_ptr[catalog->plane_size
301 * catalog->plane_depth * 3 * 2];
303 /* Determine the largest string offset mentioned in the table. */
305 tab_size = 3 * catalog->plane_size * catalog->plane_depth;
306 for (cnt = 2; cnt < tab_size; cnt += 3)
307 if (catalog->name_ptr[cnt] > max_offset)
308 max_offset = catalog->name_ptr[cnt];
310 /* Now we can check whether the file is large enough to contain the
311 tables it says it contains. */
312 if (st.st_size <= (sizeof (struct catalog_obj) + 2 * tab_size + max_offset))
313 /* The last string is not contained in the file. */
316 lastp = catalog->strings + max_offset;
317 max_offset = (st.st_size
318 - sizeof (struct catalog_obj) + 2 * tab_size + max_offset);
319 while (*lastp != '\0')
321 if (--max_offset == 0)
329 /* Release the lock again. */