intl/loadmsgcat.c

   1 /* loadmsgcat.c -- load needed message catalogs
   2    Copyright (C) 1995 Software Foundation, Inc.
   3
   4 This program is free software; you can redistribute it and/or modify
   5 it under the terms of the GNU General Public License as published by
   6 the Free Software Foundation; either version 2, or (at your option)
   7 any later version.
   8
   9 This program is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 GNU General Public License for more details.
  13
  14 You should have received a copy of the GNU General Public License
  15 along with this program; if not, write to the Free Software
  16 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  17
  18 #ifdef HAVE_CONFIG_H
  19 # include <config.h>
  20 #endif
  21
  22 #include <fcntl.h>
  23 #include <sys/types.h>
  24 #include <sys/stat.h>
  25
  26 #if defined STDC_HEADERS || defined _LIBC
  27 # include <stdlib.h>
  28 #endif
  29
  30 #if defined HAVE_UNISTD_H || defined _LIBC
  31 # include <unistd.h>
  32 #endif
  33
  34 #if (defined HAVE_MMAP && defined HAVE_MUNMAP) || defined _LIBC
  35 # include <sys/mman.h>
  36 #endif
  37
  38 #include "gettext.h"
  39 #include "gettextP.h"
  40
  41 /* @@ end of prolog @@ */
  42
  43 #ifdef _LIBC
  44 /* Rename the non ANSI C functions.  This is required by the standard
  45    because some ANSI C functions will require linking with this object
  46    file and the name space must not be polluted.  */
  47 # define fstat  __fstat
  48 # define open   __open
  49 # define close  __close
  50 # define read   __read
  51 # define mmap   __mmap
  52 # define munmap __munmap
  53 #endif
  54
  55 /* We need a sign, whether a new catalog was loaded, which can be associated
  56    with all translations.  This is important if the translations are
  57    cached by one of GCC's features.  */
  58 int _nl_msg_cat_cntr;
  59
  60
  61 /* Load the message catalogs specified by FILENAME.  If it is no valid
  62    message catalog do nothing.  */
  63 void
  64 _nl_load_domain (domain)
  65      struct loaded_domain *domain;
  66 {
  67   int fd;
  68   struct stat st;
  69   struct mo_file_header *data = (struct mo_file_header *) -1;
  70 #if (defined HAVE_MMAP && defined HAVE_MUNMAP && !defined DISALLOW_MMAP) \
  71     || defined _LIBC
  72   int use_mmap = 0;
  73 #endif
  74
  75   domain->decided = 1;
  76   domain->data = NULL;
  77
  78   /* If the record does not represent a valid locale the FILENAME
  79      might be NULL.  This can happen when according to the given
  80      specification the locale file name is different for XPG and CEN
  81      syntax.  */
  82   if (domain->filename == NULL)
  83     return;
  84
  85   /* Try to open the addressed file.  */
  86   fd = open (domain->filename, O_RDONLY);
  87   if (fd == -1)
  88     return;
  89
  90   /* We must know about the size of the file.  */
  91   if (fstat (fd, &st) != 0
  92       && st.st_size < (off_t) sizeof (struct mo_file_header))
  93     {
  94       /* Something went wrong.  */
  95       close (fd);
  96       return;
  97     }
  98
  99 #if (defined HAVE_MMAP && defined HAVE_MUNMAP && !defined DISALLOW_MMAP) \
 100     || defined _LIBC
 101   /* Now we are ready to load the file.  If mmap() is available we try
 102      this first.  If not available or it failed we try to load it.  */
 103   data = (struct mo_file_header *) mmap (NULL, st.st_size, PROT_READ,
 104                                          MAP_PRIVATE, fd, 0);
 105
 106   if (data != (struct mo_file_header *) -1)
 107     {
 108       /* mmap() call was successful.  */
 109       close (fd);
 110       use_mmap = 1;
 111     }
 112 #endif
 113
 114   /* If the data is not yet available (i.e. mmap'ed) we try to load
 115      it manually.  */
 116   if (data == (struct mo_file_header *) -1)
 117     {
 118       off_t to_read;
 119       char *read_ptr;
 120
 121       data = (struct mo_file_header *) malloc (st.st_size);
 122       if (data == NULL)
 123         return;
 124
 125       to_read = st.st_size;
 126       read_ptr = (char *) data;
 127       do
 128         {
 129           long int nb = (long int) read (fd, read_ptr, to_read);
 130           if (nb == -1)
 131             {
 132               close (fd);
 133               return;
 134             }
 135
 136           read_ptr += nb;
 137           to_read -= nb;
 138         }
 139       while (to_read > 0);
 140
 141       close (fd);
 142     }
 143
 144   /* Using the magic number we can test whether it really is a message
 145      catalog file.  */
 146   if (data->magic != _MAGIC && data->magic != _MAGIC_SWAPPED)
 147     {
 148       /* The magic number is wrong: not a message catalog file.  */
 149 #if (defined HAVE_MMAP && defined HAVE_MUNMAP && !defined DISALLOW_MMAP) \
 150     || defined _LIBC
 151       if (use_mmap)
 152         munmap ((caddr_t) data, st.st_size);
 153       else
 154 #endif
 155         free (data);
 156       return;
 157     }
 158
 159   domain->data = (char *) data;
 160   domain->must_swap = data->magic != _MAGIC;
 161
 162   /* Fill in the information about the available tables.  */
 163   switch (W (domain->must_swap, data->revision))
 164     {
 165     case 0:
 166       domain->nstrings = W (domain->must_swap, data->nstrings);
 167       domain->orig_tab = (struct string_desc *)
 168         ((char *) data + W (domain->must_swap, data->orig_tab_offset));
 169       domain->trans_tab = (struct string_desc *)
 170         ((char *) data + W (domain->must_swap, data->trans_tab_offset));
 171       domain->hash_size = W (domain->must_swap, data->hash_tab_size);
 172       domain->hash_tab = (nls_uint32 *)
 173         ((char *) data + W (domain->must_swap, data->hash_tab_offset));
 174       break;
 175     default:
 176       /* This is an illegal revision.  */
 177 #if (defined HAVE_MMAP && defined HAVE_MUNMAP && !defined DISALLOW_MMAP) \
 178     || defined _LIBC
 179       if (use_mmap)
 180         munmap ((caddr_t) data, st.st_size);
 181       else
 182 #endif
 183         free (data);
 184       domain->data = NULL;
 185       return;
 186     }
 187
 188   /* Show that one domain is changed.  This might make some cached
 189      translation invalid.  */
 190   ++_nl_msg_cat_cntr;
 191 }