intl/loadmsgcat.c

   1 /* loadmsgcat.c -- load needed message catalogs
   2    Copyright (C) 1995 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.  The master source lives in /gd/gnu/lib.
   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
  19 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  20 Cambridge, MA 02139, 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 ANSI C functions.  This is required by the standard
  49    because some ANSI 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;
  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)
  69      struct loaded_domain *domain;
  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
  79   domain->decided = 1;
  80   domain->data = NULL;
  81
  82   /* If the record does not represent a valid locale the FILENAME
  83      might be NULL.  This can happen when according to the given
  84      specification the locale file name is different for XPG and CEN
  85      syntax.  */
  86   if (domain->filename == NULL)
  87     return;
  88
  89   /* Try to open the addressed file.  */
  90   fd = open (domain->filename, O_RDONLY);
  91   if (fd == -1)
  92     return;
  93
  94   /* We must know about the size of the file.  */
  95   if (fstat (fd, &st) != 0
  96       && st.st_size < (off_t) sizeof (struct mo_file_header))
  97     {
  98       /* Something went wrong.  */
  99       close (fd);
 100       return;
 101     }
 102
 103 #if (defined HAVE_MMAP && defined HAVE_MUNMAP && !defined DISALLOW_MMAP) \
 104     || defined _LIBC
 105   /* Now we are ready to load the file.  If mmap() is available we try
 106      this first.  If not available or it failed we try to load it.  */
 107   data = (struct mo_file_header *) mmap (NULL, st.st_size, PROT_READ,
 108                                          MAP_PRIVATE, fd, 0);
 109
 110   if (data != (struct mo_file_header *) -1)
 111     {
 112       /* mmap() call was successful.  */
 113       close (fd);
 114       use_mmap = 1;
 115     }
 116 #endif
 117
 118   /* If the data is not yet available (i.e. mmap'ed) we try to load
 119      it manually.  */
 120   if (data == (struct mo_file_header *) -1)
 121     {
 122       off_t to_read;
 123       char *read_ptr;
 124
 125       data = (struct mo_file_header *) malloc (st.st_size);
 126       if (data == NULL)
 127         return;
 128
 129       to_read = st.st_size;
 130       read_ptr = (char *) data;
 131       do
 132         {
 133           long int nb = (long int) read (fd, read_ptr, to_read);
 134           if (nb == -1)
 135             {
 136               close (fd);
 137               return;
 138             }
 139
 140           read_ptr += nb;
 141           to_read -= nb;
 142         }
 143       while (to_read > 0);
 144
 145       close (fd);
 146     }
 147
 148   /* Using the magic number we can test whether it really is a message
 149      catalog file.  */
 150   if (data->magic != _MAGIC && data->magic != _MAGIC_SWAPPED)
 151     {
 152       /* The magic number is wrong: not a message catalog file.  */
 153 #if (defined HAVE_MMAP && defined HAVE_MUNMAP && !defined DISALLOW_MMAP) \
 154     || defined _LIBC
 155       if (use_mmap)
 156         munmap ((caddr_t) data, st.st_size);
 157       else
 158 #endif
 159         free (data);
 160       return;
 161     }
 162
 163   domain->data = (char *) data;
 164   domain->must_swap = data->magic != _MAGIC;
 165
 166   /* Fill in the information about the available tables.  */
 167   switch (W (domain->must_swap, data->revision))
 168     {
 169     case 0:
 170       domain->nstrings = W (domain->must_swap, data->nstrings);
 171       domain->orig_tab = (struct string_desc *)
 172         ((char *) data + W (domain->must_swap, data->orig_tab_offset));
 173       domain->trans_tab = (struct string_desc *)
 174         ((char *) data + W (domain->must_swap, data->trans_tab_offset));
 175       domain->hash_size = W (domain->must_swap, data->hash_tab_size);
 176       domain->hash_tab = (nls_uint32 *)
 177         ((char *) data + W (domain->must_swap, data->hash_tab_offset));
 178       break;
 179     default:
 180       /* This is an illegal revision.  */
 181 #if (defined HAVE_MMAP && defined HAVE_MUNMAP && !defined DISALLOW_MMAP) \
 182     || defined _LIBC
 183       if (use_mmap)
 184         munmap ((caddr_t) data, st.st_size);
 185       else
 186 #endif
 187         free (data);
 188       domain->data = NULL;
 189       return;
 190     }
 191
 192   /* Show that one domain is changed.  This might make some cached
 193      translation invalid.  */
 194   ++_nl_msg_cat_cntr;
 195 }