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/* Copyright (C) 1996 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper, <drepper@gnu.ai.mit.edu>.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If
not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <endian.h>
#include <fcntl.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include "catgetsinfo.h"
#define SWAPU32(w) \
(((w) << 24) | (((w) & 0xff00) << 8) | (((w) >> 8) & 0xff00) | ((w) >> 24))
void
__open_catalog (__nl_catd catalog, int with_path)
{
int fd;
struct stat st;
int swapping;
if (strchr (catalog->cat_name, '/') != NULL || !with_path)
fd = open (catalog->cat_name, O_RDONLY);
else
{
const char *run_nlspath = catalog->nlspath;
#define ENOUGH(n) \
if (bufact + (n) >=bufmax) \
{ \
char *old_buf = buf; \
bufmax += 256 + (n); \
buf = (char *) alloca (bufmax); \
memcpy (buf, old_buf, bufact); \
}
/* The RUN_NLSPATH variable contains a colon separated list of
descriptions where we expect to find catalogs. We have to
recognize certain % substitutions and stop when we found the
first existing file. */
char *buf;
size_t bufact;
size_t bufmax;
buf = NULL;
bufmax = 0;
fd = -1;
while (*run_nlspath != '\0')
{
bufact = 0;
while (*run_nlspath != ':' && *run_nlspath != '\0')
if (*run_nlspath == '%')
{
const char *tmp;
++run_nlspath; /* We have seen the `%'. */
switch (*run_nlspath++)
{
case 'N':
/* Use the catalog name. */
ENOUGH (strlen (catalog->cat_name));
bufact = stpcpy (&buf[bufact], catalog->cat_name) - buf;
break;
case 'L':
/* Use the current locale category value. */
ENOUGH (strlen (catalog->env_var));
bufact = stpcpy (&buf[bufact], catalog->env_var) - buf;
break;
case 'l':
/* Use language element of locale category value. */
tmp = catalog->env_var;
do
{
ENOUGH (1);
buf[bufact++] = *tmp++;
}
while (*tmp != '\0' && *tmp != '_' && *tmp != '.');
break;
case 't':
/* Use territory element of locale category value. */
tmp = catalog->env_var;
do
++tmp;
while (*tmp != '\0' && *tmp != '_' && *tmp != '.');
if (*tmp == '_')
{
++tmp;
do
{
ENOUGH (1);
buf[bufact++] = *tmp;
}
while (*tmp != '\0' && *tmp != '.');
}
break;
case 'c':
/* Use code set element of locale category value. */
tmp = catalog->env_var;
do
++tmp;
while (*tmp != '\0' && *tmp != '.');
if (*tmp == '.')
{
++tmp;
do
{
ENOUGH (1);
buf[bufact++] = *tmp;
}
while (*tmp != '\0');
}
break;
case '%':
ENOUGH (1);
buf[bufact++] = '%';
break;
default:
/* Unknown variable: ignore this path element. */
bufact = 0;
while (*run_nlspath != '\0' && *run_nlspath != ':')
++run_nlspath;
break;
}
}
else
{
ENOUGH (1);
buf[bufact++] = *run_nlspath++;
}
ENOUGH (1);
buf[bufact] = '\0';
if (bufact != 0)
{
fd = open (buf, O_RDONLY);
if (fd >= 0)
break;
}
++run_nlspath;
}
}
if (fd < 0 || fstat (fd, &st) < 0)
{
catalog->status = nonexisting;
return;
}
#ifndef MAP_COPY
/* Linux seems to lack read-only copy-on-write. */
#define MAP_COPY MAP_PRIVATE
#endif
#ifndef MAP_FILE
/* Some systems do not have this flag; it is superfluous. */
#define MAP_FILE 0
#endif
#ifndef MAP_INHERIT
/* Some systems might lack this; they lose. */
#define MAP_INHERIT 0
#endif
catalog->file_size = st.st_size;
catalog->file_ptr =
(struct catalog_obj *) mmap (NULL, st.st_size, PROT_READ,
MAP_FILE|MAP_COPY|MAP_INHERIT, fd, 0);
if (catalog->file_ptr != (struct catalog_obj *) -1)
/* Tell the world we managed to mmap the file. */
catalog->status = mmaped;
else
{
/* mmap failed perhaps because the system call is not
implemented. Try to load the file. */
size_t todo;
catalog->file_ptr = malloc (st.st_size);
if (catalog->file_ptr == NULL)
{
catalog->status = nonexisting;
return;
}
todo = st.st_size;
/* Save read, handle partial reads. */
do
{
size_t now = read (fd, (((char *) &catalog->file_ptr)
+ (st.st_size - todo)), todo);
if (now == 0)
{
free ((void *) catalog->file_ptr);
catalog->status = nonexisting;
return;
}
todo -= now;
}
while (todo > 0);
catalog->status = malloced;
}
/* We don't need the file anymore. */
close (fd);
/* Determine whether the file is a catalog file and if yes whether
it is written using the correct byte order. Else we have to swap
the values. */
if (catalog->file_ptr->magic == CATGETS_MAGIC)
swapping = 0;
else if (catalog->file_ptr->magic == SWAPU32 (CATGETS_MAGIC))
swapping = 1;
else
{
/* Illegal file. Free he resources and mark catalog as not
usable. */
if (catalog->status == mmaped)
munmap ((void *) catalog->file_ptr, catalog->file_size);
else
free (catalog->file_ptr);
catalog->status = nonexisting;
return;
}
#define SWAP(x) (swapping ? SWAPU32 (x) : (x))
/* Get dimensions of the used hashing table. */
catalog->plane_size = SWAP (catalog->file_ptr->plane_size);
catalog->plane_depth = SWAP (catalog->file_ptr->plane_depth);
/* The file contains two versions of the pointer tables. Pick the
right one for the local byte order. */
#if __BYTE_ORDER == __LITTLE_ENDIAN
catalog->name_ptr = &catalog->file_ptr->name_ptr[0];
#elif __BYTE_ORDER == __BIG_ENDIAN
catalog->name_ptr = &catalog->file_ptr->name_ptr[catalog->plane_size
* catalog->plane_depth
* 3];
#else
# error Cannot handle __BYTE_ORDER byte order
#endif
/* The rest of the file contains all the strings. They are
addressed relative to the position of the first string. */
catalog->strings =
(const char *) &catalog->file_ptr->name_ptr[catalog->plane_size
* catalog->plane_depth * 3 * 2];
}
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