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. */
58 int _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. */
63 void
_nl_load_domain(domain_file)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