intl/loadmsgcat.c

   1 /* Load needed message catalogs.
   2    Copyright (C) 1995, 1996, 1997, 1998 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 DISALLOW_MMAP) \
  39     || (defined _LIBC && defined _POSIX_MAPPED_FILES)
  40 # include <sys/mman.h>
  41 # undef HAVE_MMAP
  42 # define HAVE_MMAP      1
  43 #else
  44 # undef HAVE_MMAP
  45 #endif
  46
  47 #include "gettext.h"
  48 #include "gettextP.h"
  49
  50 /* @@ end of prolog @@ */
  51
  52 #ifdef _LIBC
  53 /* Rename the non ISO C functions.  This is required by the standard
  54    because some ISO C functions will require linking with this object
  55    file and the name space must not be polluted.  */
  56 # define open   __open
  57 # define close  __close
  58 # define read   __read
  59 # define mmap   __mmap
  60 # define munmap __munmap
  61 #endif
  62
  63 /* We need a sign, whether a new catalog was loaded, which can be associated
  64    with all translations.  This is important if the translations are
  65    cached by one of GCC's features.  */
  66 int _nl_msg_cat_cntr = 0;
  67
  68
  69 /* Load the message catalogs specified by FILENAME.  If it is no valid
  70    message catalog do nothing.  */
  71 void
  72 internal_function
  73 _nl_load_domain (domain_file)
  74      struct loaded_l10nfile *domain_file;
  75 {
  76   int fd;
  77   size_t size;
  78   struct stat st;
  79   struct mo_file_header *data = (struct mo_file_header *) -1;
  80   int use_mmap = 0;
  81   struct loaded_domain *domain;
  82
  83   domain_file->decided = 1;
  84   domain_file->data = NULL;
  85
  86   /* If the record does not represent a valid locale the FILENAME
  87      might be NULL.  This can happen when according to the given
  88      specification the locale file name is different for XPG and CEN
  89      syntax.  */
  90   if (domain_file->filename == NULL)
  91     return;
  92
  93   /* Try to open the addressed file.  */
  94   fd = open (domain_file->filename, O_RDONLY);
  95   if (fd == -1)
  96     return;
  97
  98   /* We must know about the size of the file.  */
  99   if (fstat (fd, &st) != 0
 100       || (size = (size_t) st.st_size) != st.st_size
 101       || size < sizeof (struct mo_file_header))
 102     {
 103       /* Something went wrong.  */
 104       close (fd);
 105       return;
 106     }
 107
 108 #ifdef HAVE_MMAP
 109   /* Now we are ready to load the file.  If mmap() is available we try
 110      this first.  If not available or it failed we try to load it.  */
 111   data = (struct mo_file_header *) mmap (NULL, size, PROT_READ,
 112                                          MAP_PRIVATE, fd, 0);
 113
 114   if (data != (struct mo_file_header *) -1)
 115     {
 116       /* mmap() call was successful.  */
 117       close (fd);
 118       use_mmap = 1;
 119     }
 120 #endif
 121
 122   /* If the data is not yet available (i.e. mmap'ed) we try to load
 123      it manually.  */
 124   if (data == (struct mo_file_header *) -1)
 125     {
 126       size_t to_read;
 127       char *read_ptr;
 128
 129       data = (struct mo_file_header *) malloc (size);
 130       if (data == NULL)
 131         return;
 132
 133       to_read = size;
 134       read_ptr = (char *) data;
 135       do
 136         {
 137           long int nb = (long int) read (fd, read_ptr, to_read);
 138           if (nb == -1)
 139             {
 140               close (fd);
 141               return;
 142             }
 143
 144           read_ptr += nb;
 145           to_read -= nb;
 146         }
 147       while (to_read > 0);
 148
 149       close (fd);
 150     }
 151
 152   /* Using the magic number we can test whether it really is a message
 153      catalog file.  */
 154   if (data->magic != _MAGIC && data->magic != _MAGIC_SWAPPED)
 155     {
 156       /* The magic number is wrong: not a message catalog file.  */
 157 #ifdef HAVE_MMAP
 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 invalid revision.  */
 192 #ifdef HAVE_MMAP
 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 #ifdef _POSIX_MAPPED_FILES
 216   if (domain->use_mmap)
 217     munmap ((caddr_t) domain->data, domain->mmap_size);
 218   else
 219 #endif  /* _POSIX_MAPPED_FILES */
 220     free ((void *) domain->data);
 221
 222   free (domain);
 223 }
 224 #endif