1 /* Implementation of the textdomain(3) function.
2 Copyright (C) 1995-1998, 2000, 2001, 2002 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., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301,
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. */
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 (domainname)
81 const char *domainname;
82 {
83 char *new_domain;
84 char *old_domain;
85
86 /* A NULL pointer requests the current setting. */
87 if (domainname == NULL)
88 return (char *) _nl_current_default_domain;
89
90 __libc_rwlock_wrlock (_nl_state_lock);
91
92 old_domain = (char *) _nl_current_default_domain;
93
94 /* If domain name is the null string set to default domain "messages". */
95 if (domainname[0] == '\0'
96 || strcmp (domainname, _nl_default_default_domain) == 0)
97 {
98 _nl_current_default_domain = _nl_default_default_domain;
99 new_domain = (char *) _nl_current_default_domain;
100 }
101 else if (strcmp (domainname, old_domain) == 0)
102 /* This can happen and people will use it to signal that some
103 environment variable changed. */
104 new_domain = old_domain;
105 else
106 {
107 /* If the following malloc fails `_nl_current_default_domain'
108 will be NULL. This value will be returned and so signals we
109 are out of core. */
110 #if defined _LIBC || defined HAVE_STRDUP
111 new_domain = strdup (domainname);
112 #else
113 size_t len = strlen (domainname) + 1;
114 new_domain = (char *) malloc (len);
115 if (new_domain != NULL)
116 memcpy (new_domain, domainname, len);
117 #endif
118
119 if (new_domain != NULL)
120 _nl_current_default_domain = new_domain;
121 }
122
123 /* We use this possibility to signal a change of the loaded catalogs
124 since this is most likely the case and there is no other easy we
125 to do it. Do it only when the call was successful. */
126 if (new_domain != NULL)
127 {
128 ++_nl_msg_cat_cntr;
129
130 if (old_domain != new_domain && old_domain != _nl_default_default_domain)
131 free (old_domain);
132 }
133
134 __libc_rwlock_unlock (_nl_state_lock);
135
136 return new_domain;
137 }
138
139 #ifdef _LIBC
140 /* Alias for function name in GNU C Library. */
141 weak_alias (__textdomain, textdomain);
142 #endif