intl/loadmsgcat.c

   1 /* Load needed message catalogs.
   2    Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc.
   3
   4    This file is part of the GNU C Library.  Its master source is NOT part of
   5    the C library, however.
   6
   7    The GNU C Library is free software; you can redistribute it and/or
   8    modify it under the terms of the GNU Library General Public License as
   9    published by the Free Software Foundation; either version 2 of the
  10    License, or (at your option) any later version.
  11
  12    The GNU C Library is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15    Library General Public License for more details.
  16
  17    You should have received a copy of the GNU Library General Public
  18    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  19    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  20    Boston, MA 02111-1307, USA.  */
  21
  22 #ifdef HAVE_CONFIG_H
  23 # include <config.h>
  24 #endif
  25
  26 #include <fcntl.h>
  27 #include <sys/types.h>
  28 #include <sys/stat.h>
  29
  30 #if defined STDC_HEADERS || defined _LIBC
  31 # include <stdlib.h>
  32 #endif
  33
  34 #if defined HAVE_UNISTD_H || defined _LIBC
  35 # include <unistd.h>
  36 #endif
  37
  38 #if (defined HAVE_MMAP && defined HAVE_MUNMAP) || defined _LIBC
  39 # include <sys/mman.h>
  40 #endif
  41
  42 #include "gettext.h"
  43 #include "gettextP.h"
  44
  45 /* @@ end of prolog @@ */
  46
  47 #ifdef _LIBC
  48 /* Rename the non ISO C functions.  This is required by the standard
  49    because some ISO C functions will require linking with this object
  50    file and the name space must not be polluted.  */
  51 # define fstat  __fstat
  52 # define open   __open
  53 # define close  __close
  54 # define read   __read
  55 # define mmap   __mmap
  56 # define munmap __munmap
  57 #endif
  58
  59 /* We need a sign, whether a new catalog was loaded, which can be associated
  60    with all translations.  This is important if the translations are
  61    cached by one of GCC's features.  */
  62 int _nl_msg_cat_cntr = 0;
  63
  64
  65 /* Load the message catalogs specified by FILENAME.  If it is no valid
  66    message catalog do nothing.  */
  67 void
  68 _nl_load_domain (domain_file)
  69      struct loaded_l10nfile *domain_file;
  70 {
  71   int fd;
  72   struct stat st;
  73   struct mo_file_header *data = (struct mo_file_header *) -1;
  74 #if (defined HAVE_MMAP && defined HAVE_MUNMAP && !defined DISALLOW_MMAP) \
  75     || defined _LIBC
  76   int use_mmap = 0;
  77 #endif
  78   struct loaded_domain *domain;
  79
  80   domain_file->decided = 1;
  81   domain_file->data = NULL;
  82
  83   /* If the record does not represent a valid locale the FILENAME
  84      might be NULL.  This can happen when according to the given
  85      specification the locale file name is different for XPG and CEN
  86      syntax.  */
  87   if (domain_file->filename == NULL)
  88     return;
  89
  90   /* Try to open the addressed file.  */
  91   fd = open (domain_file->filename, O_RDONLY);
  92   if (fd == -1)
  93     return;
  94
  95   /* We must know about the size of the file.  */
  96   if (fstat (fd, &st) != 0
  97       && st.st_size < (off_t) sizeof (struct mo_file_header))
  98     {
  99       /* Something went wrong.  */
 100       close (fd);
 101       return;
 102     }
 103
 104 #if (defined HAVE_MMAP && defined HAVE_MUNMAP && !defined DISALLOW_MMAP) \
 105     || defined _LIBC
 106   /* Now we are ready to load the file.  If mmap() is available we try
 107      this first.  If not available or it failed we try to load it.  */
 108   data = (struct mo_file_header *) mmap (NULL, st.st_size, PROT_READ,
 109                                          MAP_PRIVATE, fd, 0);
 110
 111   if (data != (struct mo_file_header *) -1)
 112     {
 113       /* mmap() call was successful.  */
 114       close (fd);
 115       use_mmap = 1;
 116     }
 117 #endif
 118
 119   /* If the data is not yet available (i.e. mmap'ed) we try to load
 120      it manually.  */
 121   if (data == (struct mo_file_header *) -1)
 122     {
 123       off_t to_read;
 124       char *read_ptr;
 125
 126       data = (struct mo_file_header *) malloc (st.st_size);
 127       if (data == NULL)
 128         return;
 129
 130       to_read = st.st_size;
 131       read_ptr = (char *) data;
 132       do
 133         {
 134           long int nb = (long int) read (fd, read_ptr, to_read);
 135           if (nb == -1)
 136             {
 137               close (fd);
 138               return;
 139             }
 140
 141           read_ptr += nb;
 142           to_read -= nb;
 143         }
 144       while (to_read > 0);
 145
 146       close (fd);
 147     }
 148
 149   /* Using the magic number we can test whether it really is a message
 150      catalog file.  */
 151   if (data->magic != _MAGIC && data->magic != _MAGIC_SWAPPED)
 152     {
 153       /* The magic number is wrong: not a message catalog file.  */
 154 #if (defined HAVE_MMAP && defined HAVE_MUNMAP && !defined DISALLOW_MMAP) \
 155     || defined _LIBC
 156       if (use_mmap)
 157         munmap ((caddr_t) data, st.st_size);
 158       else
 159 #endif
 160         free (data);
 161       return;
 162     }
 163
 164   domain_file->data
 165     = (struct loaded_domain *) malloc (sizeof (struct loaded_domain));
 166   if (domain_file->data == NULL)
 167     return;
 168
 169   domain = (struct loaded_domain *) domain_file->data;
 170   domain->data = (char *) data;
 171   domain->use_mmap = use_mmap;
 172   domain->mmap_size = st.st_size;
 173   domain->must_swap = data->magic != _MAGIC;
 174
 175   /* Fill in the information about the available tables.  */
 176   switch (W (domain->must_swap, data->revision))
 177     {
 178     case 0:
 179       domain->nstrings = W (domain->must_swap, data->nstrings);
 180       domain->orig_tab = (struct string_desc *)
 181         ((char *) data + W (domain->must_swap, data->orig_tab_offset));
 182       domain->trans_tab = (struct string_desc *)
 183         ((char *) data + W (domain->must_swap, data->trans_tab_offset));
 184       domain->hash_size = W (domain->must_swap, data->hash_tab_size);
 185       domain->hash_tab = (nls_uint32 *)
 186         ((char *) data + W (domain->must_swap, data->hash_tab_offset));
 187       break;
 188     default:
 189       /* This is an illegal revision.  */
 190 #if (defined HAVE_MMAP && defined HAVE_MUNMAP && !defined DISALLOW_MMAP) \
 191     || defined _LIBC
 192       if (use_mmap)
 193         munmap ((caddr_t) data, st.st_size);
 194       else
 195 #endif
 196         free (data);
 197       free (domain);
 198       domain_file->data = NULL;
 199       return;
 200     }
 201
 202   /* Show that one domain is changed.  This might make some cached
 203      translations invalid.  */
 204   ++_nl_msg_cat_cntr;
 205 }
 206
 207
 208 #ifdef _LIBC
 209 void
 210 _nl_unload_domain (domain)
 211      struct loaded_domain *domain;
 212 {
 213   if (domain->use_mmap)
 214     munmap ((caddr_t) domain->data, domain->mmap_size);
 215   else
 216     free ((void *) domain->data);
 217
 218   free (domain);
 219 }
 220 #endif