summary refs log tree commit diff
path: root/intl/loadmsgcat.c
blob: 1daf72a09fb3aac0c02d12851ee51da5f97d1812 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
/* loadmsgcat.c -- load needed message catalogs
Copyright (C) 1995, 1996 Free Software Foundation, Inc.
Written by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1995.

The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.

The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Library General Public License for more details.

You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB.  If
not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>

#if defined STDC_HEADERS || defined _LIBC
# include <stdlib.h>
#endif

#if defined HAVE_UNISTD_H || defined _LIBC
# include <unistd.h>
#endif

#if (defined HAVE_MMAP && defined HAVE_MUNMAP) || defined _LIBC
# include <sys/mman.h>
#endif

#include "gettext.h"
#include "gettextP.h"

/* @@ end of prolog @@ */

#ifdef _LIBC
/* Rename the non ANSI C functions.  This is required by the standard
   because some ANSI C functions will require linking with this object
   file and the name space must not be polluted.  */
# define fstat  __fstat
# define open   __open
# define close  __close
# define read   __read
# define mmap   __mmap
# define munmap __munmap
#endif

/* We need a sign, whether a new catalog was loaded, which can be associated
   with all translations.  This is important if the translations are
   cached by one of GCC's features.  */
int _nl_msg_cat_cntr;


/* Load the message catalogs specified by FILENAME.  If it is no valid
   message catalog do nothing.  */
void
_nl_load_domain (domain_file)
     struct loaded_l10nfile *domain_file;
{
  int fd;
  struct stat st;
  struct mo_file_header *data = (struct mo_file_header *) -1;
#if (defined HAVE_MMAP && defined HAVE_MUNMAP && !defined DISALLOW_MMAP) \
    || defined _LIBC
  int use_mmap = 0;
#endif
  struct loaded_domain *domain;

  domain_file->decided = 1;
  domain_file->data = NULL;

  /* If the record does not represent a valid locale the FILENAME
     might be NULL.  This can happen when according to the given
     specification the locale file name is different for XPG and CEN
     syntax.  */
  if (domain_file->filename == NULL)
    return;

  /* Try to open the addressed file.  */
  fd = open (domain_file->filename, O_RDONLY);
  if (fd == -1)
    return;

  /* We must know about the size of the file.  */
  if (fstat (fd, &st) != 0
      && st.st_size < (off_t) sizeof (struct mo_file_header))
    {
      /* Something went wrong.  */
      close (fd);
      return;
    }

#if (defined HAVE_MMAP && defined HAVE_MUNMAP && !defined DISALLOW_MMAP) \
    || defined _LIBC
  /* Now we are ready to load the file.  If mmap() is available we try
     this first.  If not available or it failed we try to load it.  */
  data = (struct mo_file_header *) mmap (NULL, st.st_size, PROT_READ,
					 MAP_PRIVATE, fd, 0);

  if (data != (struct mo_file_header *) -1)
    {
      /* mmap() call was successful.  */
      close (fd);
      use_mmap = 1;
    }
#endif

  /* If the data is not yet available (i.e. mmap'ed) we try to load
     it manually.  */
  if (data == (struct mo_file_header *) -1)
    {
      off_t to_read;
      char *read_ptr;

      data = (struct mo_file_header *) malloc (st.st_size);
      if (data == NULL)
	return;

      to_read = st.st_size;
      read_ptr = (char *) data;
      do
	{
	  long int nb = (long int) read (fd, read_ptr, to_read);
	  if (nb == -1)
	    {
	      close (fd);
	      return;
	    }

	  read_ptr += nb;
	  to_read -= nb;
	}
      while (to_read > 0);

      close (fd);
    }

  /* Using the magic number we can test whether it really is a message
     catalog file.  */
  if (data->magic != _MAGIC && data->magic != _MAGIC_SWAPPED)
    {
      /* The magic number is wrong: not a message catalog file.  */
#if (defined HAVE_MMAP && defined HAVE_MUNMAP && !defined DISALLOW_MMAP) \
    || defined _LIBC
      if (use_mmap)
	munmap ((caddr_t) data, st.st_size);
      else
#endif
	free (data);
      return;
    }

  domain_file->data
    = (struct loaded_domain *) malloc (sizeof (struct loaded_domain *));
  if (domain->data == NULL)
    return;

  domain = (struct loaded_domain *) domain_file->data;
  domain->data = (char *) data;
  domain->must_swap = data->magic != _MAGIC;

  /* Fill in the information about the available tables.  */
  switch (W (domain->must_swap, data->revision))
    {
    case 0:
      domain->nstrings = W (domain->must_swap, data->nstrings);
      domain->orig_tab = (struct string_desc *)
	((char *) data + W (domain->must_swap, data->orig_tab_offset));
      domain->trans_tab = (struct string_desc *)
	((char *) data + W (domain->must_swap, data->trans_tab_offset));
      domain->hash_size = W (domain->must_swap, data->hash_tab_size);
      domain->hash_tab = (nls_uint32 *)
	((char *) data + W (domain->must_swap, data->hash_tab_offset));
      break;
    default:
      /* This is an illegal revision.  */
#if (defined HAVE_MMAP && defined HAVE_MUNMAP && !defined DISALLOW_MMAP) \
    || defined _LIBC
      if (use_mmap)
	munmap ((caddr_t) data, st.st_size);
      else
#endif
	free (data);
      free (domain);
      domain_file->data = NULL;
      return;
    }

  /* Show that one domain is changed.  This might make some cached
     translations invalid.  */
  ++_nl_msg_cat_cntr;
}