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1 /* Implementation of the textdomain(3) function.
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2 Copyright (C) 1995-1998, 2000, 2001, 2002 Free Software Foundation, Inc.
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3
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4 This program is free software; you can redistribute it and/or modify it
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5 under the terms of the GNU Library General Public License as published
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6 by the Free Software Foundation; either version 2, or (at your option)
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7 any later version.
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8
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9 This program is distributed in the hope that it will be useful,
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10 but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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12 Library General Public License for more details.
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13
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14 You should have received a copy of the GNU Library General Public
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15 License along with this program; if not, write to the Free Software
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16 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301,
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17 USA. */
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18
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19 #ifdef HAVE_CONFIG_H
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20 # include <config.h>
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21 #endif
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22
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23 #include <stdlib.h>
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24 #include <string.h>
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25
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26 #ifdef _LIBC
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27 # include <libintl.h>
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28 #else
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29 # include "libgnuintl.h"
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30 #endif
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31 #include "gettextP.h"
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32
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33 #ifdef _LIBC
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34 /* We have to handle multi-threaded applications. */
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35 # include <bits/libc-lock.h>
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36 #else
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37 /* Provide dummy implementation if this is outside glibc. */
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38 # define __libc_rwlock_define(CLASS, NAME)
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39 # define __libc_rwlock_wrlock(NAME)
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40 # define __libc_rwlock_unlock(NAME)
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41 #endif
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42
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43 /* The internal variables in the standalone libintl.a must have different
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44 names than the internal variables in GNU libc, otherwise programs
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45 using libintl.a cannot be linked statically. */
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46 #if !defined _LIBC
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47 # define _nl_default_default_domain libintl_nl_default_default_domain
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48 # define _nl_current_default_domain libintl_nl_current_default_domain
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49 #endif
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50
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51 /* @@ end of prolog @@ */
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52
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53 /* Name of the default text domain. */
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54 extern const char _nl_default_default_domain[] attribute_hidden;
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55
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56 /* Default text domain in which entries for gettext(3) are to be found. */
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57 extern const char *_nl_current_default_domain attribute_hidden;
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58
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59
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60 /* Names for the libintl functions are a problem. They must not clash
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61 with existing names and they should follow ANSI C. But this source
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62 code is also used in GNU C Library where the names have a __
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63 prefix. So we have to make a difference here. */
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64 #ifdef _LIBC
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65 # define TEXTDOMAIN __textdomain
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66 # ifndef strdup
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67 # define strdup(str) __strdup (str)
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68 # endif
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69 #else
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70 # define TEXTDOMAIN libintl_textdomain
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71 #endif
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72
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73 /* Lock variable to protect the global data in the gettext implementation. */
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74 __libc_rwlock_define (extern, _nl_state_lock attribute_hidden)
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75
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76 /* Set the current default message catalog to DOMAINNAME.
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77 If DOMAINNAME is null, return the current default.
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78 If DOMAINNAME is "", reset to the default of "messages". */
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79 char *
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80 TEXTDOMAIN (domainname)
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81 const char *domainname;
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82 {
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83 char *new_domain;
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84 char *old_domain;
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85
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86 /* A NULL pointer requests the current setting. */
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87 if (domainname == NULL)
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88 return (char *) _nl_current_default_domain;
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89
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90 __libc_rwlock_wrlock (_nl_state_lock);
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91
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92 old_domain = (char *) _nl_current_default_domain;
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93
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94 /* If domain name is the null string set to default domain "messages". */
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95 if (domainname[0] == '\0'
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96 || strcmp (domainname, _nl_default_default_domain) == 0)
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97 {
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98 _nl_current_default_domain = _nl_default_default_domain;
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99 new_domain = (char *) _nl_current_default_domain;
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100 }
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101 else if (strcmp (domainname, old_domain) == 0)
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102 /* This can happen and people will use it to signal that some
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103 environment variable changed. */
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104 new_domain = old_domain;
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105 else
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106 {
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107 /* If the following malloc fails `_nl_current_default_domain'
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108 will be NULL. This value will be returned and so signals we
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109 are out of core. */
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110 #if defined _LIBC || defined HAVE_STRDUP
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111 new_domain = strdup (domainname);
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112 #else
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113 size_t len = strlen (domainname) + 1;
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114 new_domain = (char *) malloc (len);
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115 if (new_domain != NULL)
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116 memcpy (new_domain, domainname, len);
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117 #endif
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118
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119 if (new_domain != NULL)
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120 _nl_current_default_domain = new_domain;
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121 }
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122
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123 /* We use this possibility to signal a change of the loaded catalogs
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124 since this is most likely the case and there is no other easy we
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125 to do it. Do it only when the call was successful. */
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126 if (new_domain != NULL)
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127 {
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128 ++_nl_msg_cat_cntr;
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129
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130 if (old_domain != new_domain && old_domain != _nl_default_default_domain)
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131 free (old_domain);
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132 }
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133
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134 __libc_rwlock_unlock (_nl_state_lock);
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135
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136 return new_domain;
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137 }
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138
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139 #ifdef _LIBC
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140 /* Alias for function name in GNU C Library. */
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141 weak_alias (__textdomain, textdomain);
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142 #endif
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