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[deliverable/binutils-gdb.git] / intl / textdomain.c
1 /* Implementation of the textdomain(3) function
2 Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc.
3 Written by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1995.
4
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2, or (at your option)
8 any later version.
9
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software Foundation,
17 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
18
19 #ifdef HAVE_CONFIG_H
20 # include <config.h>
21 #endif
22
23 #if defined STDC_HEADERS || defined _LIBC
24 # include <stdlib.h>
25 #endif
26
27 #if defined STDC_HEADERS || defined HAVE_STRING_H || defined _LIBC
28 # include <string.h>
29 #else
30 # include <strings.h>
31 # ifndef memcpy
32 # define memcpy(Dst, Src, Num) bcopy (Src, Dst, Num)
33 # endif
34 #endif
35
36 #ifdef _LIBC
37 # include <libintl.h>
38 #else
39 # include "libgettext.h"
40 #endif
41
42 /* @@ end of prolog @@ */
43
44 /* Name of the default text domain. */
45 extern const char _nl_default_default_domain[];
46
47 /* Default text domain in which entries for gettext(3) are to be found. */
48 extern const char *_nl_current_default_domain;
49
50
51 /* Names for the libintl functions are a problem. They must not clash
52 with existing names and they should follow ANSI C. But this source
53 code is also used in GNU C Library where the names have a __
54 prefix. So we have to make a difference here. */
55 #ifdef _LIBC
56 # define TEXTDOMAIN __textdomain
57 # define strdup(str) __strdup (str)
58 #else
59 # define TEXTDOMAIN textdomain__
60 #endif
61
62 /* Set the current default message catalog to DOMAINNAME.
63 If DOMAINNAME is null, return the current default.
64 If DOMAINNAME is "", reset to the default of "messages". */
65 char *
66 TEXTDOMAIN (domainname)
67 const char *domainname;
68 {
69 char *old;
70
71 /* A NULL pointer requests the current setting. */
72 if (domainname == NULL)
73 return (char *) _nl_current_default_domain;
74
75 old = (char *) _nl_current_default_domain;
76
77 /* If domain name is the null string set to default domain "messages". */
78 if (domainname[0] == '\0'
79 || strcmp (domainname, _nl_default_default_domain) == 0)
80 _nl_current_default_domain = _nl_default_default_domain;
81 else
82 {
83 /* If the following malloc fails `_nl_current_default_domain'
84 will be NULL. This value will be returned and so signals we
85 are out of core. */
86 #if defined _LIBC || defined HAVE_STRDUP
87 _nl_current_default_domain = strdup (domainname);
88 #else
89 size_t len = strlen (domainname) + 1;
90 char *cp = (char *) malloc (len);
91 if (cp != NULL)
92 memcpy (cp, domainname, len);
93 _nl_current_default_domain = cp;
94 #endif
95 }
96
97 if (old != _nl_default_default_domain)
98 free (old);
99
100 return (char *) _nl_current_default_domain;
101 }
102
103 #ifdef _LIBC
104 /* Alias for function name in GNU C Library. */
105 weak_alias (__textdomain, textdomain);
106 #endif
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