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/* loadmsgcat.c -- load needed message catalogs
Copyright (C) 1995 Software Foundation, Inc.
This file is part of the GNU C Library. Its master source is NOT part of
the C library, however. The master source lives in /gd/gnu/lib.
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., 675 Mass Ave,
Cambridge, MA 02139, USA. */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#if defined STDC_HEADERS || defined _LIBC
# include <stdlib.h>
#endif
#if defined HAVE_UNISTD_H || defined _LIBC
# include <unistd.h>
#endif
#if (defined HAVE_MMAP && defined HAVE_MUNMAP) || defined _LIBC
# include <sys/mman.h>
#endif
#include "gettext.h"
#include "gettextP.h"
/* @@ end of prolog @@ */
#ifdef _LIBC
/* Rename the non ANSI C functions. This is required by the standard
because some ANSI C functions will require linking with this object
file and the name space must not be polluted. */
# define fstat __fstat
# define open __open
# define close __close
# define read __read
# define mmap __mmap
# define munmap __munmap
#endif
/* We need a sign, whether a new catalog was loaded, which can be associated
with all translations. This is important if the translations are
cached by one of GCC's features. */
int _nl_msg_cat_cntr;
/* Load the message catalogs specified by FILENAME. If it is no valid
message catalog do nothing. */
void
_nl_load_domain (domain)
struct loaded_domain *domain;
{
int fd;
struct stat st;
struct mo_file_header *data = (struct mo_file_header *) -1;
#if (defined HAVE_MMAP && defined HAVE_MUNMAP && !defined DISALLOW_MMAP) \
|| defined _LIBC
int use_mmap = 0;
#endif
domain->decided = 1;
domain->data = NULL;
/* If the record does not represent a valid locale the FILENAME
might be NULL. This can happen when according to the given
specification the locale file name is different for XPG and CEN
syntax. */
if (domain->filename == NULL)
return;
/* Try to open the addressed file. */
fd = open (domain->filename, O_RDONLY);
if (fd == -1)
return;
/* We must know about the size of the file. */
if (fstat (fd, &st) != 0
&& st.st_size < (off_t) sizeof (struct mo_file_header))
{
/* Something went wrong. */
close (fd);
return;
}
#if (defined HAVE_MMAP && defined HAVE_MUNMAP && !defined DISALLOW_MMAP) \
|| defined _LIBC
/* Now we are ready to load the file. If mmap() is available we try
this first. If not available or it failed we try to load it. */
data = (struct mo_file_header *) mmap (NULL, st.st_size, PROT_READ,
MAP_PRIVATE, fd, 0);
if (data != (struct mo_file_header *) -1)
{
/* mmap() call was successful. */
close (fd);
use_mmap = 1;
}
#endif
/* If the data is not yet available (i.e. mmap'ed) we try to load
it manually. */
if (data == (struct mo_file_header *) -1)
{
off_t to_read;
char *read_ptr;
data = (struct mo_file_header *) malloc (st.st_size);
if (data == NULL)
return;
to_read = st.st_size;
read_ptr = (char *) data;
do
{
long int nb = (long int) read (fd, read_ptr, to_read);
if (nb == -1)
{
close (fd);
return;
}
read_ptr += nb;
to_read -= nb;
}
while (to_read > 0);
close (fd);
}
/* Using the magic number we can test whether it really is a message
catalog file. */
if (data->magic != _MAGIC && data->magic != _MAGIC_SWAPPED)
{
/* The magic number is wrong: not a message catalog file. */
#if (defined HAVE_MMAP && defined HAVE_MUNMAP && !defined DISALLOW_MMAP) \
|| defined _LIBC
if (use_mmap)
munmap ((caddr_t) data, st.st_size);
else
#endif
free (data);
return;
}
domain->data = (char *) data;
domain->must_swap = data->magic != _MAGIC;
/* Fill in the information about the available tables. */
switch (W (domain->must_swap, data->revision))
{
case 0:
domain->nstrings = W (domain->must_swap, data->nstrings);
domain->orig_tab = (struct string_desc *)
((char *) data + W (domain->must_swap, data->orig_tab_offset));
domain->trans_tab = (struct string_desc *)
((char *) data + W (domain->must_swap, data->trans_tab_offset));
domain->hash_size = W (domain->must_swap, data->hash_tab_size);
domain->hash_tab = (nls_uint32 *)
((char *) data + W (domain->must_swap, data->hash_tab_offset));
break;
default:
/* This is an illegal revision. */
#if (defined HAVE_MMAP && defined HAVE_MUNMAP && !defined DISALLOW_MMAP) \
|| defined _LIBC
if (use_mmap)
munmap ((caddr_t) data, st.st_size);
else
#endif
free (data);
domain->data = NULL;
return;
}
/* Show that one domain is changed. This might make some cached
translation invalid. */
++_nl_msg_cat_cntr;
}
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