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   size_t size;
  73   struct stat st;
  74   struct mo_file_header *data = (struct mo_file_header *) -1;
  75 #if (defined HAVE_MMAP && defined HAVE_MUNMAP && !defined DISALLOW_MMAP) \
  76     || defined _LIBC
  77   int use_mmap = 0;
  78 #endif
  79   struct loaded_domain *domain;
  80
  81   domain_file->decided = 1;
  82   domain_file->data = NULL;
  83
  84   /* If the record does not represent a valid locale the FILENAME
  85      might be NULL.  This can happen when according to the given
  86      specification the locale file name is different for XPG and CEN
  87      syntax.  */
  88   if (domain_file->filename == NULL)
  89     return;
  90
  91   /* Try to open the addressed file.  */
  92   fd = open (domain_file->filename, O_RDONLY);
  93   if (fd == -1)
  94     return;
  95
  96   /* We must know about the size of the file.  */
  97   if (fstat (fd, &st) != 0
  98       || (size = (size_t) st.st_size) != st.st_size
  99       || size < sizeof (struct mo_file_header))
 100     {
 101       /* Something went wrong.  */
 102       close (fd);
 103       return;
 104     }
 105
 106 #if (defined HAVE_MMAP && defined HAVE_MUNMAP && !defined DISALLOW_MMAP) \
 107     || defined _LIBC
 108   /* Now we are ready to load the file.  If mmap() is available we try
 109      this first.  If not available or it failed we try to load it.  */
 110   data = (struct mo_file_header *) mmap (NULL, size, PROT_READ,
 111                                          MAP_PRIVATE, fd, 0);
 112
 113   if (data != (struct mo_file_header *) -1)
 114     {
 115       /* mmap() call was successful.  */
 116       close (fd);
 117       use_mmap = 1;
 118     }
 119 #endif
 120
 121   /* If the data is not yet available (i.e. mmap'ed) we try to load
 122      it manually.  */
 123   if (data == (struct mo_file_header *) -1)
 124     {
 125       size_t to_read;
 126       char *read_ptr;
 127
 128       data = (struct mo_file_header *) malloc (size);
 129       if (data == NULL)
 130         return;
 131
 132       to_read = size;
 133       read_ptr = (char *) data;
 134       do
 135         {
 136           long int nb = (long int) read (fd, read_ptr, to_read);
 137           if (nb == -1)
 138             {
 139               close (fd);
 140               return;
 141             }
 142
 143           read_ptr += nb;
 144           to_read -= nb;
 145         }
 146       while (to_read > 0);
 147
 148       close (fd);
 149     }
 150
 151   /* Using the magic number we can test whether it really is a message
 152      catalog file.  */
 153   if (data->magic != _MAGIC && data->magic != _MAGIC_SWAPPED)
 154     {
 155       /* The magic number is wrong: not a message catalog file.  */
 156 #if (defined HAVE_MMAP && defined HAVE_MUNMAP && !defined DISALLOW_MMAP) \
 157     || defined _LIBC
 158       if (use_mmap)
 159         munmap ((caddr_t) data, size);
 160       else
 161 #endif
 162         free (data);
 163       return;
 164     }
 165
 166   domain_file->data
 167     = (struct loaded_domain *) malloc (sizeof (struct loaded_domain));
 168   if (domain_file->data == NULL)
 169     return;
 170
 171   domain = (struct loaded_domain *) domain_file->data;
 172   domain->data = (char *) data;
 173   domain->use_mmap = use_mmap;
 174   domain->mmap_size = size;
 175   domain->must_swap = data->magic != _MAGIC;
 176
 177   /* Fill in the information about the available tables.  */
 178   switch (W (domain->must_swap, data->revision))
 179     {
 180     case 0:
 181       domain->nstrings = W (domain->must_swap, data->nstrings);
 182       domain->orig_tab = (struct string_desc *)
 183         ((char *) data + W (domain->must_swap, data->orig_tab_offset));
 184       domain->trans_tab = (struct string_desc *)
 185         ((char *) data + W (domain->must_swap, data->trans_tab_offset));
 186       domain->hash_size = W (domain->must_swap, data->hash_tab_size);
 187       domain->hash_tab = (nls_uint32 *)
 188         ((char *) data + W (domain->must_swap, data->hash_tab_offset));
 189       break;
 190     default:
 191       /* This is an illegal revision.  */
 192 #if (defined HAVE_MMAP && defined HAVE_MUNMAP && !defined DISALLOW_MMAP) \
 193     || defined _LIBC
 194       if (use_mmap)
 195         munmap ((caddr_t) data, size);
 196       else
 197 #endif
 198         free (data);
 199       free (domain);
 200       domain_file->data = NULL;
 201       return;
 202     }
 203
 204   /* Show that one domain is changed.  This might make some cached
 205      translations invalid.  */
 206   ++_nl_msg_cat_cntr;
 207 }
 208
 209
 210 #ifdef _LIBC
 211 void
 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