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/* Load needed message catalogs

   Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc.

   This program is free software; you can redistribute it and/or modify

   it under the terms of the GNU General Public License as published by

   the Free Software Foundation; either version 2, or (at your option)

   any later version.

   This program 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 General Public License for more details.

   You should have received a copy of the GNU General Public License

   along with this program; if not, write to the Free Software Foundation,

   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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 ISO C functions.  This is required by the standard

   because some ISO 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 = 0;

/* Load the message catalogs specified by FILENAME.  If it is no valid

   message catalog do nothing.  */

void

_nl_load_domain (domain_file)

     struct loaded_l10nfile *domain_file;

{

  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

  struct loaded_domain *domain;

  domain_file->decided = 1;

  domain_file->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_file->filename == NULL)

    return;

  /* Try to open the addressed file.  */

  fd = open (domain_file->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_file->data

    = (struct loaded_domain *) malloc (sizeof (struct loaded_domain));

  if (domain_file->data == NULL)

    return;

  domain = (struct loaded_domain *) domain_file->data;

  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);

      free (domain);

      domain_file->data = NULL;

      return;

    }

  /* Show that one domain is changed.  This might make some cached

     translations invalid.  */

  ++_nl_msg_cat_cntr;

}