1 /* Implementation of the textdomain(3) function.
2 Copyright (C) 1995-1998, 2000-2003 Free Software Foundation, Inc.
3
4 This program is free software; you can redistribute it and/or modify it
5 under the terms of the GNU Library General Public License as published
6 by 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 GNU
12 Library General Public License for more details.
13
14 You should have received a copy of the GNU Library General Public
15 License along with this program; if not, write to the Free Software
16 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
17 USA. */
18
19 #ifdef HAVE_CONFIG_H
20 # include <config.h>
21 #endif
22
23 #include <stdlib.h>
24 #include <string.h>
25
26 #ifdef _LIBC
27 # include <libintl.h>
28 #else
29 # include "libgnuintl.h"
30 #endif
31 #include "gettextP.h"
32
33 #ifdef _LIBC
34 /* We have to handle multi-threaded applications. */
35 # include <bits/libc-lock.h>
36 #else
37 /* Provide dummy implementation if this is outside glibc. */
38 # define __libc_rwlock_define(CLASS, NAME)
39 # define __libc_rwlock_wrlock(NAME)
40 # define __libc_rwlock_unlock(NAME)
41 #endif
42
43 /* The internal variables in the standalone libintl.a must have different
44 names than the internal variables in GNU libc, otherwise programs
45 using libintl.a cannot be linked statically. */
46 #if !defined _LIBC
47 # define _nl_default_default_domain libintl_nl_default_default_domain
48 # define _nl_current_default_domain libintl_nl_current_default_domain
49 #endif
50
51 /* @@ end of prolog @@ */
52
53 /* Name of the default text domain. */
54 extern const char _nl_default_default_domain[] attribute_hidden;
55
56 /* Default text domain in which entries for gettext(3) are to be found. */
57 extern const char *_nl_current_default_domain attribute_hidden;
58
59
60 /* Names for the libintl functions are a problem. They must not clash
61 with existing names and they should follow ANSI C. But this source
62 code is also used in GNU C Library where the names have a __
63 prefix. So we have to make a difference here. */
64 #ifdef _LIBC
65 # define TEXTDOMAIN __textdomain
66 # ifndef strdup
67 # define strdup(str) __strdup (str)
68 # endif
69 #else
70 # define TEXTDOMAIN libintl_textdomain
71 #endif
72
73 /* Lock variable to protect the global data in the gettext implementation. */
__libc_rwlock_define(extern,_nl_state_lock attribute_hidden)74 __libc_rwlock_define (extern, _nl_state_lock attribute_hidden)
75
76 /* Set the current default message catalog to DOMAINNAME.
77 If DOMAINNAME is null, return the current default.
78 If DOMAINNAME is "", reset to the default of "messages". */
79 char *
80 TEXTDOMAIN (const char *domainname)
81 {
82 char *new_domain;
83 char *old_domain;
84
85 /* A NULL pointer requests the current setting. */
86 if (domainname == NULL)
87 return (char *) _nl_current_default_domain;
88
89 __libc_rwlock_wrlock (_nl_state_lock);
90
91 old_domain = (char *) _nl_current_default_domain;
92
93 /* If domain name is the null string set to default domain "messages". */
94 if (domainname[0] == '\0'
95 || strcmp (domainname, _nl_default_default_domain) == 0)
96 {
97 _nl_current_default_domain = _nl_default_default_domain;
98 new_domain = (char *) _nl_current_default_domain;
99 }
100 else if (strcmp (domainname, old_domain) == 0)
101 /* This can happen and people will use it to signal that some
102 environment variable changed. */
103 new_domain = old_domain;
104 else
105 {
106 /* If the following malloc fails `_nl_current_default_domain'
107 will be NULL. This value will be returned and so signals we
108 are out of core. */
109 #if defined _LIBC || defined HAVE_STRDUP
110 new_domain = strdup (domainname);
111 #else
112 size_t len = strlen (domainname) + 1;
113 new_domain = (char *) malloc (len);
114 if (new_domain != NULL)
115 memcpy (new_domain, domainname, len);
116 #endif
117
118 if (new_domain != NULL)
119 _nl_current_default_domain = new_domain;
120 }
121
122 /* We use this possibility to signal a change of the loaded catalogs
123 since this is most likely the case and there is no other easy we
124 to do it. Do it only when the call was successful. */
125 if (new_domain != NULL)
126 {
127 ++_nl_msg_cat_cntr;
128
129 if (old_domain != new_domain && old_domain != _nl_default_default_domain)
130 free (old_domain);
131 }
132
133 __libc_rwlock_unlock (_nl_state_lock);
134
135 return new_domain;
136 }
137
138 #ifdef _LIBC
139 /* Alias for function name in GNU C Library. */
140 weak_alias (__textdomain, textdomain);
141 #endif
142