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. */
29 #include "catgetsinfo.h"
32 #define SWAPU32(w) bswap_32 (w)
36 __open_catalog (__nl_catd catalog)
42 /* Make sure we are alone. */
43 __libc_lock_lock (catalog->lock);
45 /* Check whether there was no other thread faster. */
46 if (catalog->status != closed)
47 /* While we waited some other thread tried to open the catalog. */
50 if (strchr (catalog->cat_name, '/') != NULL || catalog->nlspath == NULL)
51 fd = __open (catalog->cat_name, O_RDONLY);
54 const char *run_nlspath = catalog->nlspath;
56 if (bufact + (n) >=bufmax) \
58 char *old_buf = buf; \
59 bufmax += 256 + (n); \
60 buf = (char *) alloca (bufmax); \
61 memcpy (buf, old_buf, bufact); \
64 /* The RUN_NLSPATH variable contains a colon separated list of
65 descriptions where we expect to find catalogs. We have to
66 recognize certain % substitutions and stop when we found the
67 first existing file. */
77 while (*run_nlspath != '\0')
80 while (*run_nlspath != ':' && *run_nlspath != '\0')
81 if (*run_nlspath == '%')
85 ++run_nlspath; /* We have seen the `%'. */
86 switch (*run_nlspath++)
89 /* Use the catalog name. */
90 len = strlen (catalog->cat_name);
92 memcpy (&buf[bufact], catalog->cat_name, len);
96 /* Use the current locale category value. */
97 len = strlen (catalog->env_var);
99 memcpy (&buf[bufact], catalog->env_var, len);
103 /* Use language element of locale category value. */
104 tmp = catalog->env_var;
108 buf[bufact++] = *tmp++;
110 while (*tmp != '\0' && *tmp != '_' && *tmp != '.');
113 /* Use territory element of locale category value. */
114 tmp = catalog->env_var;
117 while (*tmp != '\0' && *tmp != '_' && *tmp != '.');
124 buf[bufact++] = *tmp;
126 while (*tmp != '\0' && *tmp != '.');
130 /* Use code set element of locale category value. */
131 tmp = catalog->env_var;
134 while (*tmp != '\0' && *tmp != '.');
141 buf[bufact++] = *tmp;
143 while (*tmp != '\0');
151 /* Unknown variable: ignore this path element. */
153 while (*run_nlspath != '\0' && *run_nlspath != ':')
161 buf[bufact++] = *run_nlspath++;
168 fd = __open (buf, O_RDONLY);
177 /* Avoid dealing with directories and block devices */
178 if (fd < 0 || __fstat (fd, &st) < 0 || !S_ISREG (st.st_mode))
180 catalog->status = nonexisting;
185 /* Linux seems to lack read-only copy-on-write. */
186 # define MAP_COPY MAP_PRIVATE
189 /* Some systems do not have this flag; it is superfluous. */
193 /* Some systems might lack this; they lose. */
194 # define MAP_INHERIT 0
196 catalog->file_size = st.st_size;
198 (struct catalog_obj *) __mmap (NULL, st.st_size, PROT_READ,
199 MAP_FILE|MAP_COPY|MAP_INHERIT, fd, 0);
200 if (catalog->file_ptr != (struct catalog_obj *) MAP_FAILED)
201 /* Tell the world we managed to mmap the file. */
202 catalog->status = mmapped;
205 /* mmap failed perhaps because the system call is not
206 implemented. Try to load the file. */
208 catalog->file_ptr = malloc (st.st_size);
209 if (catalog->file_ptr == NULL)
211 catalog->status = nonexisting;
215 /* Save read, handle partial reads. */
218 size_t now = __read (fd, (((char *) &catalog->file_ptr)
219 + (st.st_size - todo)), todo);
222 free ((void *) catalog->file_ptr);
223 catalog->status = nonexisting;
229 catalog->status = malloced;
232 /* We don't need the file anymore. */
236 /* Determine whether the file is a catalog file and if yes whether
237 it is written using the correct byte order. Else we have to swap
239 if (catalog->file_ptr->magic == CATGETS_MAGIC)
241 else if (catalog->file_ptr->magic == SWAPU32 (CATGETS_MAGIC))
245 /* Invalid file. Free the resources and mark catalog as not
247 if (catalog->status == mmapped)
248 __munmap ((void *) catalog->file_ptr, catalog->file_size);
250 free (catalog->file_ptr);
251 catalog->status = nonexisting;
255 #define SWAP(x) (swapping ? SWAPU32 (x) : (x))
257 /* Get dimensions of the used hashing table. */
258 catalog->plane_size = SWAP (catalog->file_ptr->plane_size);
259 catalog->plane_depth = SWAP (catalog->file_ptr->plane_depth);
261 /* The file contains two versions of the pointer tables. Pick the
262 right one for the local byte order. */
263 #if __BYTE_ORDER == __LITTLE_ENDIAN
264 catalog->name_ptr = &catalog->file_ptr->name_ptr[0];
265 #elif __BYTE_ORDER == __BIG_ENDIAN
266 catalog->name_ptr = &catalog->file_ptr->name_ptr[catalog->plane_size
267 * catalog->plane_depth
270 # error Cannot handle __BYTE_ORDER byte order
273 /* The rest of the file contains all the strings. They are
274 addressed relative to the position of the first string. */
276 (const char *) &catalog->file_ptr->name_ptr[catalog->plane_size
277 * catalog->plane_depth * 3 * 2];
279 /* Release the lock again. */
283 __libc_lock_unlock (catalog->lock);