332 lines
8.8 KiB
C
332 lines
8.8 KiB
C
/* Copyright (C) 1996-2000, 2001, 2002, 2003 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper, <drepper@gnu.org>.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <byteswap.h>
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#include <endian.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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#ifdef _POSIX_MAPPED_FILES
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# include <sys/mman.h>
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#endif
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#include <sys/stat.h>
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#include "catgetsinfo.h"
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#include <not-cancel.h>
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#define SWAPU32(w) bswap_32 (w)
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int
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__open_catalog (const char *cat_name, const char *nlspath, const char *env_var,
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__nl_catd catalog)
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{
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int fd = -1;
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struct stat64 st;
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int swapping;
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size_t cnt;
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size_t max_offset;
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size_t tab_size;
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const char *lastp;
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int result = -1;
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if (strchr (cat_name, '/') != NULL || nlspath == NULL)
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fd = open_not_cancel_2 (cat_name, O_RDONLY);
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else
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{
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const char *run_nlspath = nlspath;
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#define ENOUGH(n) \
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if (__builtin_expect (bufact + (n) >= bufmax, 0)) \
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{ \
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char *old_buf = buf; \
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bufmax += 256 + (n); \
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buf = (char *) alloca (bufmax); \
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memcpy (buf, old_buf, bufact); \
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}
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/* The RUN_NLSPATH variable contains a colon separated list of
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descriptions where we expect to find catalogs. We have to
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recognize certain % substitutions and stop when we found the
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first existing file. */
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char *buf;
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size_t bufact;
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size_t bufmax;
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size_t len;
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buf = NULL;
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bufmax = 0;
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fd = -1;
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while (*run_nlspath != '\0')
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{
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bufact = 0;
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if (*run_nlspath == ':')
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{
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/* Leading colon or adjacent colons - treat same as %N. */
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len = strlen (cat_name);
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ENOUGH (len);
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memcpy (&buf[bufact], cat_name, len);
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bufact += len;
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}
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else
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while (*run_nlspath != ':' && *run_nlspath != '\0')
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if (*run_nlspath == '%')
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{
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const char *tmp;
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++run_nlspath; /* We have seen the `%'. */
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switch (*run_nlspath++)
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{
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case 'N':
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/* Use the catalog name. */
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len = strlen (cat_name);
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ENOUGH (len);
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memcpy (&buf[bufact], cat_name, len);
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bufact += len;
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break;
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case 'L':
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/* Use the current locale category value. */
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len = strlen (env_var);
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ENOUGH (len);
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memcpy (&buf[bufact], env_var, len);
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bufact += len;
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break;
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case 'l':
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/* Use language element of locale category value. */
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tmp = env_var;
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do
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{
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ENOUGH (1);
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buf[bufact++] = *tmp++;
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}
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while (*tmp != '\0' && *tmp != '_' && *tmp != '.');
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break;
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case 't':
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/* Use territory element of locale category value. */
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tmp = env_var;
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do
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++tmp;
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while (*tmp != '\0' && *tmp != '_' && *tmp != '.');
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if (*tmp == '_')
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{
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++tmp;
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do
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{
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ENOUGH (1);
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buf[bufact++] = *tmp++;
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}
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while (*tmp != '\0' && *tmp != '.');
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}
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break;
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case 'c':
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/* Use code set element of locale category value. */
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tmp = env_var;
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do
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++tmp;
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while (*tmp != '\0' && *tmp != '.');
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if (*tmp == '.')
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{
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++tmp;
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do
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{
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ENOUGH (1);
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buf[bufact++] = *tmp++;
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}
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while (*tmp != '\0');
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}
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break;
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case '%':
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ENOUGH (1);
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buf[bufact++] = '%';
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break;
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default:
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/* Unknown variable: ignore this path element. */
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bufact = 0;
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while (*run_nlspath != '\0' && *run_nlspath != ':')
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++run_nlspath;
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break;
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}
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}
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else
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{
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ENOUGH (1);
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buf[bufact++] = *run_nlspath++;
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}
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ENOUGH (1);
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buf[bufact] = '\0';
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if (bufact != 0)
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{
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fd = open_not_cancel_2 (buf, O_RDONLY);
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if (fd >= 0)
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break;
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}
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++run_nlspath;
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}
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}
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/* Avoid dealing with directories and block devices */
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if (__builtin_expect (fd, 0) < 0)
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return -1;
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if (__builtin_expect (__fxstat64 (_STAT_VER, fd, &st), 0) < 0)
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goto close_unlock_return;
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if (__builtin_expect (!S_ISREG (st.st_mode), 0)
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|| (size_t) st.st_size < sizeof (struct catalog_obj))
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{
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/* `errno' is not set correctly but the file is not usable.
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Use an reasonable error value. */
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__set_errno (EINVAL);
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goto close_unlock_return;
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}
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catalog->file_size = st.st_size;
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#ifdef _POSIX_MAPPED_FILES
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# ifndef MAP_COPY
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/* Linux seems to lack read-only copy-on-write. */
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# define MAP_COPY MAP_PRIVATE
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# endif
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# ifndef MAP_FILE
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/* Some systems do not have this flag; it is superfluous. */
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# define MAP_FILE 0
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# endif
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catalog->file_ptr =
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(struct catalog_obj *) __mmap (NULL, st.st_size, PROT_READ,
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MAP_FILE|MAP_COPY, fd, 0);
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if (__builtin_expect (catalog->file_ptr != (struct catalog_obj *) MAP_FAILED,
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1))
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/* Tell the world we managed to mmap the file. */
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catalog->status = mmapped;
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else
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#endif /* _POSIX_MAPPED_FILES */
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{
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/* mmap failed perhaps because the system call is not
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implemented. Try to load the file. */
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size_t todo;
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catalog->file_ptr = malloc (st.st_size);
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if (catalog->file_ptr == NULL)
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goto close_unlock_return;
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todo = st.st_size;
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/* Save read, handle partial reads. */
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do
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{
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size_t now = read_not_cancel (fd, (((char *) catalog->file_ptr)
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+ (st.st_size - todo)), todo);
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if (now == 0 || now == (size_t) -1)
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{
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#ifdef EINTR
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if (now == (size_t) -1 && errno == EINTR)
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continue;
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#endif
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free ((void *) catalog->file_ptr);
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goto close_unlock_return;
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}
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todo -= now;
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}
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while (todo > 0);
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catalog->status = malloced;
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}
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/* Determine whether the file is a catalog file and if yes whether
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it is written using the correct byte order. Else we have to swap
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the values. */
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if (__builtin_expect (catalog->file_ptr->magic == CATGETS_MAGIC, 1))
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swapping = 0;
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else if (catalog->file_ptr->magic == SWAPU32 (CATGETS_MAGIC))
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swapping = 1;
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else
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{
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invalid_file:
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/* Invalid file. Free the resources and mark catalog as not
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usable. */
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#ifdef _POSIX_MAPPED_FILES
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if (catalog->status == mmapped)
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__munmap ((void *) catalog->file_ptr, catalog->file_size);
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else
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#endif /* _POSIX_MAPPED_FILES */
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free (catalog->file_ptr);
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goto close_unlock_return;
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}
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#define SWAP(x) (swapping ? SWAPU32 (x) : (x))
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/* Get dimensions of the used hashing table. */
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catalog->plane_size = SWAP (catalog->file_ptr->plane_size);
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catalog->plane_depth = SWAP (catalog->file_ptr->plane_depth);
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/* The file contains two versions of the pointer tables. Pick the
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right one for the local byte order. */
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#if __BYTE_ORDER == __LITTLE_ENDIAN
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catalog->name_ptr = &catalog->file_ptr->name_ptr[0];
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#elif __BYTE_ORDER == __BIG_ENDIAN
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catalog->name_ptr = &catalog->file_ptr->name_ptr[catalog->plane_size
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* catalog->plane_depth
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* 3];
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#else
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# error Cannot handle __BYTE_ORDER byte order
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#endif
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/* The rest of the file contains all the strings. They are
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addressed relative to the position of the first string. */
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catalog->strings =
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(const char *) &catalog->file_ptr->name_ptr[catalog->plane_size
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* catalog->plane_depth * 3 * 2];
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/* Determine the largest string offset mentioned in the table. */
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max_offset = 0;
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tab_size = 3 * catalog->plane_size * catalog->plane_depth;
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for (cnt = 2; cnt < tab_size; cnt += 3)
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if (catalog->name_ptr[cnt] > max_offset)
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max_offset = catalog->name_ptr[cnt];
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/* Now we can check whether the file is large enough to contain the
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tables it says it contains. */
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if ((size_t) st.st_size
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<= (sizeof (struct catalog_obj) + 2 * tab_size + max_offset))
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/* The last string is not contained in the file. */
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goto invalid_file;
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lastp = catalog->strings + max_offset;
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max_offset = (st.st_size
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- sizeof (struct catalog_obj) + 2 * tab_size + max_offset);
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while (*lastp != '\0')
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{
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if (--max_offset == 0)
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goto invalid_file;
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++lastp;
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}
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/* We succeeded. */
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result = 0;
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/* Release the lock again. */
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close_unlock_return:
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close_not_cancel_no_status (fd);
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return result;
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}
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libc_hidden_def (__open_catalog)
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