intl/loadmsgcat.c

   1 /* Load needed message catalogs.
   2    Copyright (C) 1995, 1996, 1997, 1998 Free 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 Foundation,
  16    Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, 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 ISO C functions.  This is required by the standard
  45    because some ISO C functions will require linking with this object
  46    file and the name space must not be polluted.  */
  47 # define open   __open
  48 # define close  __close
  49 # define read   __read
  50 # define mmap   __mmap
  51 # define munmap __munmap
  52 #endif
  53
  54 /* We need a sign, whether a new catalog was loaded, which can be associated
  55    with all translations.  This is important if the translations are
  56    cached by one of GCC's features.  */
  57 int _nl_msg_cat_cntr = 0;
  58
  59
  60 /* Load the message catalogs specified by FILENAME.  If it is no valid
  61    message catalog do nothing.  */
  62 void
  63 internal_function
  64 _nl_load_domain (domain_file)
  65      struct loaded_l10nfile *domain_file;
  66 {
  67   int fd;
  68   size_t size;
  69   struct stat st;
  70   struct mo_file_header *data = (struct mo_file_header *) -1;
  71 #if (defined HAVE_MMAP && defined HAVE_MUNMAP && !defined DISALLOW_MMAP) \
  72     || defined _LIBC
  73   int use_mmap = 0;
  74 #endif
  75   struct loaded_domain *domain;
  76
  77   domain_file->decided = 1;
  78   domain_file->data = NULL;
  79
  80   /* If the record does not represent a valid locale the FILENAME
  81      might be NULL.  This can happen when according to the given
  82      specification the locale file name is different for XPG and CEN
  83      syntax.  */
  84   if (domain_file->filename == NULL)
  85     return;
  86
  87   /* Try to open the addressed file.  */
  88   fd = open (domain_file->filename, O_RDONLY);
  89   if (fd == -1)
  90     return;
  91
  92   /* We must know about the size of the file.  */
  93   if (fstat (fd, &st) != 0
  94       || (size = (size_t) st.st_size) != st.st_size
  95       || size < sizeof (struct mo_file_header))
  96     {
  97       /* Something went wrong.  */
  98       close (fd);
  99       return;
 100     }
 101
 102 #if (defined HAVE_MMAP && defined HAVE_MUNMAP && !defined DISALLOW_MMAP) \
 103     || defined _LIBC
 104   /* Now we are ready to load the file.  If mmap() is available we try
 105      this first.  If not available or it failed we try to load it.  */
 106   data = (struct mo_file_header *) mmap (NULL, size, PROT_READ,
 107                                          MAP_PRIVATE, fd, 0);
 108
 109   if (data != (struct mo_file_header *) -1)
 110     {
 111       /* mmap() call was successful.  */
 112       close (fd);
 113       use_mmap = 1;
 114     }
 115 #endif
 116
 117   /* If the data is not yet available (i.e. mmap'ed) we try to load
 118      it manually.  */
 119   if (data == (struct mo_file_header *) -1)
 120     {
 121       size_t to_read;
 122       char *read_ptr;
 123
 124       data = (struct mo_file_header *) malloc (size);
 125       if (data == NULL)
 126         return;
 127
 128       to_read = size;
 129       read_ptr = (char *) data;
 130       do
 131         {
 132           long int nb = (long int) read (fd, read_ptr, to_read);
 133           if (nb == -1)
 134             {
 135               close (fd);
 136               return;
 137             }
 138
 139           read_ptr += nb;
 140           to_read -= nb;
 141         }
 142       while (to_read > 0);
 143
 144       close (fd);
 145     }
 146
 147   /* Using the magic number we can test whether it really is a message
 148      catalog file.  */
 149   if (data->magic != _MAGIC && data->magic != _MAGIC_SWAPPED)
 150     {
 151       /* The magic number is wrong: not a message catalog file.  */
 152 #if (defined HAVE_MMAP && defined HAVE_MUNMAP && !defined DISALLOW_MMAP) \
 153     || defined _LIBC
 154       if (use_mmap)
 155         munmap ((caddr_t) data, size);
 156       else
 157 #endif
 158         free (data);
 159       return;
 160     }
 161
 162   domain_file->data
 163     = (struct loaded_domain *) malloc (sizeof (struct loaded_domain));
 164   if (domain_file->data == NULL)
 165     return;
 166
 167   domain = (struct loaded_domain *) domain_file->data;
 168   domain->data = (char *) data;
 169 #if (defined HAVE_MMAP && defined HAVE_MUNMAP && !defined DISALLOW_MMAP) \
 170     || defined _LIBC
 171   domain->use_mmap = use_mmap;
 172 #endif
 173   domain->mmap_size = size;
 174   domain->must_swap = data->magic != _MAGIC;
 175
 176   /* Fill in the information about the available tables.  */
 177   switch (W (domain->must_swap, data->revision))
 178     {
 179     case 0:
 180       domain->nstrings = W (domain->must_swap, data->nstrings);
 181       domain->orig_tab = (struct string_desc *)
 182         ((char *) data + W (domain->must_swap, data->orig_tab_offset));
 183       domain->trans_tab = (struct string_desc *)
 184         ((char *) data + W (domain->must_swap, data->trans_tab_offset));
 185       domain->hash_size = W (domain->must_swap, data->hash_tab_size);
 186       domain->hash_tab = (nls_uint32 *)
 187         ((char *) data + W (domain->must_swap, data->hash_tab_offset));
 188       break;
 189     default:
 190       /* This is an illegal revision.  */
 191 #if (defined HAVE_MMAP && defined HAVE_MUNMAP && !defined DISALLOW_MMAP) \
 192     || defined _LIBC
 193       if (use_mmap)
 194         munmap ((caddr_t) data, size);
 195       else
 196 #endif
 197         free (data);
 198       free (domain);
 199       domain_file->data = NULL;
 200       return;
 201     }
 202
 203   /* Show that one domain is changed.  This might make some cached
 204      translations invalid.  */
 205   ++_nl_msg_cat_cntr;
 206 }
 207
 208
 209 #ifdef _LIBC
 210 void
 211 internal_function
 212 _nl_unload_domain (domain)
 213      struct loaded_domain *domain;
 214 {
 215   if (domain->use_mmap)
 216     munmap ((caddr_t) domain->data, domain->mmap_size);
 217   else
 218     free ((void *) domain->data);
 219
 220   free (domain);
 221 }
 222 #endif