264 lines
6.9 KiB
C
264 lines
6.9 KiB
C
/* Copyright (C) 1996 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.ai.mit.edu>.
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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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <endian.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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#include <sys/mman.h>
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#include <sys/stat.h>
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#include "catgetsinfo.h"
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#define SWAPU32(w) \
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(((w) << 24) | (((w) & 0xff00) << 8) | (((w) >> 8) & 0xff00) | ((w) >> 24))
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void
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__open_catalog (__nl_catd catalog, int with_path)
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{
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int fd;
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struct stat st;
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int swapping;
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if (strchr (catalog->cat_name, '/') != NULL || !with_path)
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fd = open (catalog->cat_name, O_RDONLY);
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else
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{
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const char *run_nlspath = catalog->nlspath;
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#define ENOUGH(n) \
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if (bufact + (n) >=bufmax) \
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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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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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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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ENOUGH (strlen (catalog->cat_name));
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bufact = __stpcpy (&buf[bufact], catalog->cat_name) - buf;
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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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ENOUGH (strlen (catalog->env_var));
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bufact = __stpcpy (&buf[bufact], catalog->env_var) - buf;
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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 = catalog->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 = catalog->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 = catalog->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 (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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if (fd < 0 || __fstat (fd, &st) < 0)
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{
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catalog->status = nonexisting;
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return;
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}
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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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#ifndef MAP_INHERIT
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/* Some systems might lack this; they lose. */
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#define MAP_INHERIT 0
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#endif
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catalog->file_size = st.st_size;
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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|MAP_INHERIT, fd, 0);
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if (catalog->file_ptr != (struct catalog_obj *) -1)
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/* Tell the world we managed to mmap the file. */
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catalog->status = mmaped;
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else
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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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{
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catalog->status = nonexisting;
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return;
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}
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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 (fd, (((char *) &catalog->file_ptr)
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+ (st.st_size - todo)), todo);
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if (now == 0)
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{
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free ((void *) catalog->file_ptr);
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catalog->status = nonexisting;
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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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/* We don't need the file anymore. */
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__close (fd);
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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 (catalog->file_ptr->magic == CATGETS_MAGIC)
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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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/* Illegal file. Free he resources and mark catalog as not
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usable. */
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if (catalog->status == mmaped)
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__munmap ((void *) catalog->file_ptr, catalog->file_size);
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else
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free (catalog->file_ptr);
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catalog->status = nonexisting;
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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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}
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