341 lines
9.2 KiB
C
341 lines
9.2 KiB
C
/* Copyright (C) 1996, 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Ulrich Drepper, <drepper@gnu.org>.
|
|
|
|
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 <byteswap.h>
|
|
#include <endian.h>
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <string.h>
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
#ifdef _POSIX_MAPPED_FILES
|
|
# include <sys/mman.h>
|
|
#endif
|
|
#include <sys/stat.h>
|
|
|
|
#include "catgetsinfo.h"
|
|
|
|
|
|
#define SWAPU32(w) bswap_32 (w)
|
|
|
|
|
|
void
|
|
__open_catalog (__nl_catd catalog)
|
|
{
|
|
int fd = -1;
|
|
struct stat st;
|
|
int swapping;
|
|
size_t cnt;
|
|
size_t max_offset;
|
|
size_t tab_size;
|
|
const char *lastp;
|
|
|
|
/* Make sure we are alone. */
|
|
__libc_lock_lock (catalog->lock);
|
|
|
|
/* Check whether there was no other thread faster. */
|
|
if (catalog->status != closed)
|
|
/* While we waited some other thread tried to open the catalog. */
|
|
goto unlock_return;
|
|
|
|
if (strchr (catalog->cat_name, '/') != NULL || catalog->nlspath == NULL)
|
|
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;
|
|
size_t len;
|
|
|
|
buf = NULL;
|
|
bufmax = 0;
|
|
|
|
fd = -1;
|
|
while (*run_nlspath != '\0')
|
|
{
|
|
bufact = 0;
|
|
|
|
if (*run_nlspath == ':')
|
|
{
|
|
/* Leading colon or adjacent colons - treat same as %N. */
|
|
len = strlen (catalog->cat_name);
|
|
ENOUGH (len);
|
|
memcpy (&buf[bufact], catalog->cat_name, len);
|
|
bufact += len;
|
|
}
|
|
else
|
|
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. */
|
|
len = strlen (catalog->cat_name);
|
|
ENOUGH (len);
|
|
memcpy (&buf[bufact], catalog->cat_name, len);
|
|
bufact += len;
|
|
break;
|
|
case 'L':
|
|
/* Use the current locale category value. */
|
|
len = strlen (catalog->env_var);
|
|
ENOUGH (len);
|
|
memcpy (&buf[bufact], catalog->env_var, len);
|
|
bufact += len;
|
|
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;
|
|
}
|
|
}
|
|
|
|
/* Avoid dealing with directories and block devices */
|
|
if (fd < 0)
|
|
{
|
|
catalog->status = nonexisting;
|
|
goto unlock_return;
|
|
}
|
|
|
|
if (__fxstat (_STAT_VER, fd, &st) < 0)
|
|
{
|
|
catalog->status = nonexisting;
|
|
goto close_unlock_return;
|
|
}
|
|
if (!S_ISREG (st.st_mode) || st.st_size < sizeof (struct catalog_obj))
|
|
{
|
|
/* `errno' is not set correctly but the file is not usable.
|
|
Use an reasonable error value. */
|
|
__set_errno (EINVAL);
|
|
catalog->status = nonexisting;
|
|
goto close_unlock_return;
|
|
}
|
|
|
|
catalog->file_size = st.st_size;
|
|
#ifdef _POSIX_MAPPED_FILES
|
|
# 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_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 *) MAP_FAILED)
|
|
/* Tell the world we managed to mmap the file. */
|
|
catalog->status = mmapped;
|
|
else
|
|
#endif /* _POSIX_MAPPED_FILES */
|
|
{
|
|
/* 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;
|
|
goto close_unlock_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;
|
|
goto close_unlock_return;
|
|
}
|
|
todo -= now;
|
|
}
|
|
while (todo > 0);
|
|
catalog->status = malloced;
|
|
}
|
|
|
|
/* 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
|
|
{
|
|
invalid_file:
|
|
/* Invalid file. Free the resources and mark catalog as not
|
|
usable. */
|
|
#ifdef _POSIX_MAPPED_FILES
|
|
if (catalog->status == mmapped)
|
|
__munmap ((void *) catalog->file_ptr, catalog->file_size);
|
|
else
|
|
#endif /* _POSIX_MAPPED_FILES */
|
|
free (catalog->file_ptr);
|
|
catalog->status = nonexisting;
|
|
goto close_unlock_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];
|
|
|
|
/* Determine the largest string offset mentioned in the table. */
|
|
max_offset = 0;
|
|
tab_size = 3 * catalog->plane_size * catalog->plane_depth;
|
|
for (cnt = 2; cnt < tab_size; cnt += 3)
|
|
if (catalog->name_ptr[cnt] > max_offset)
|
|
max_offset = catalog->name_ptr[cnt];
|
|
|
|
/* Now we can check whether the file is large enough to contain the
|
|
tables it says it contains. */
|
|
if (st.st_size <= (sizeof (struct catalog_obj) + 2 * tab_size + max_offset))
|
|
/* The last string is not contained in the file. */
|
|
goto invalid_file;
|
|
|
|
lastp = catalog->strings + max_offset;
|
|
max_offset = (st.st_size
|
|
- sizeof (struct catalog_obj) + 2 * tab_size + max_offset);
|
|
while (*lastp != '\0')
|
|
{
|
|
if (--max_offset == 0)
|
|
goto invalid_file;
|
|
++lastp;
|
|
}
|
|
|
|
/* Release the lock again. */
|
|
close_unlock_return:
|
|
__close (fd);
|
|
unlock_return:
|
|
__libc_lock_unlock (catalog->lock);
|
|
}
|