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