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1 /* Implementation of the bindtextdomain(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 <stddef.h>
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24 #include <stdlib.h>
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25 #include <string.h>
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26
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27 #ifdef _LIBC
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28 # include <libintl.h>
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29 #else
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30 # include "libgnuintl.h"
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31 #endif
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32 #include "gettextP.h"
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33
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34 #ifdef _LIBC
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35 /* We have to handle multi-threaded applications. */
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36 # include <bits/libc-lock.h>
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37 #else
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38 /* Provide dummy implementation if this is outside glibc. */
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39 # define __libc_rwlock_define(CLASS, NAME)
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40 # define __libc_rwlock_wrlock(NAME)
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41 # define __libc_rwlock_unlock(NAME)
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42 #endif
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43
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44 /* The internal variables in the standalone libintl.a must have different
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45 names than the internal variables in GNU libc, otherwise programs
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46 using libintl.a cannot be linked statically. */
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47 #if !defined _LIBC
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48 # define _nl_default_dirname libintl_nl_default_dirname
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49 # define _nl_domain_bindings libintl_nl_domain_bindings
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50 #endif
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51
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52 /* Some compilers, like SunOS4 cc, don't have offsetof in <stddef.h>. */
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53 #ifndef offsetof
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54 # define offsetof(type,ident) ((size_t)&(((type*)0)->ident))
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55 #endif
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56
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57 /* @@ end of prolog @@ */
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58
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59 /* Contains the default location of the message catalogs. */
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60 extern const char _nl_default_dirname[];
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61 #ifdef _LIBC
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62 extern const char _nl_default_dirname_internal[] attribute_hidden;
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63 #else
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64 # define INTUSE(name) name
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65 #endif
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66
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67 /* List with bindings of specific domains. */
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68 extern struct binding *_nl_domain_bindings;
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69
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70 /* Lock variable to protect the global data in the gettext implementation. */
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71 __libc_rwlock_define (extern, _nl_state_lock attribute_hidden)
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72
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73
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74 /* Names for the libintl functions are a problem. They must not clash
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75 with existing names and they should follow ANSI C. But this source
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76 code is also used in GNU C Library where the names have a __
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77 prefix. So we have to make a difference here. */
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78 #ifdef _LIBC
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79 # define BINDTEXTDOMAIN __bindtextdomain
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80 # define BIND_TEXTDOMAIN_CODESET __bind_textdomain_codeset
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81 # ifndef strdup
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82 # define strdup(str) __strdup (str)
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83 # endif
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84 #else
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85 # define BINDTEXTDOMAIN libintl_bindtextdomain
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86 # define BIND_TEXTDOMAIN_CODESET libintl_bind_textdomain_codeset
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87 #endif
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88
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89 /* Prototypes for local functions. */
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90 static void set_binding_values PARAMS ((const char *domainname,
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91 const char **dirnamep,
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92 const char **codesetp));
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93
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94 /* Specifies the directory name *DIRNAMEP and the output codeset *CODESETP
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95 to be used for the DOMAINNAME message catalog.
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96 If *DIRNAMEP or *CODESETP is NULL, the corresponding attribute is not
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97 modified, only the current value is returned.
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98 If DIRNAMEP or CODESETP is NULL, the corresponding attribute is neither
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99 modified nor returned. */
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100 static void
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101 set_binding_values (domainname, dirnamep, codesetp)
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102 const char *domainname;
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103 const char **dirnamep;
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104 const char **codesetp;
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105 {
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106 struct binding *binding;
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107 int modified;
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108
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109 /* Some sanity checks. */
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110 if (domainname == NULL || domainname[0] == '\0')
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111 {
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112 if (dirnamep)
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113 *dirnamep = NULL;
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114 if (codesetp)
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115 *codesetp = NULL;
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116 return;
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117 }
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118
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119 __libc_rwlock_wrlock (_nl_state_lock);
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120
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121 modified = 0;
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122
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123 for (binding = _nl_domain_bindings; binding != NULL; binding = binding->next)
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124 {
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125 int compare = strcmp (domainname, binding->domainname);
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126 if (compare == 0)
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127 /* We found it! */
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128 break;
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129 if (compare < 0)
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130 {
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131 /* It is not in the list. */
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132 binding = NULL;
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133 break;
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134 }
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135 }
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136
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137 if (binding != NULL)
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138 {
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139 if (dirnamep)
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140 {
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141 const char *dirname = *dirnamep;
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142
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143 if (dirname == NULL)
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144 /* The current binding has be to returned. */
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145 *dirnamep = binding->dirname;
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146 else
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147 {
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148 /* The domain is already bound. If the new value and the old
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149 one are equal we simply do nothing. Otherwise replace the
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150 old binding. */
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151 char *result = binding->dirname;
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152 if (strcmp (dirname, result) != 0)
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153 {
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154 if (strcmp (dirname, INTUSE(_nl_default_dirname)) == 0)
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155 result = (char *) INTUSE(_nl_default_dirname);
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156 else
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157 {
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158 #if defined _LIBC || defined HAVE_STRDUP
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159 result = strdup (dirname);
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160 #else
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161 size_t len = strlen (dirname) + 1;
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162 result = (char *) malloc (len);
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163 if (__builtin_expect (result != NULL, 1))
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164 memcpy (result, dirname, len);
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165 #endif
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166 }
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167
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168 if (__builtin_expect (result != NULL, 1))
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169 {
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170 if (binding->dirname != INTUSE(_nl_default_dirname))
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171 free (binding->dirname);
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172
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173 binding->dirname = result;
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174 modified = 1;
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175 }
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176 }
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177 *dirnamep = result;
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178 }
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179 }
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180
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181 if (codesetp)
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182 {
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183 const char *codeset = *codesetp;
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184
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185 if (codeset == NULL)
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186 /* The current binding has be to returned. */
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187 *codesetp = binding->codeset;
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188 else
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189 {
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190 /* The domain is already bound. If the new value and the old
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191 one are equal we simply do nothing. Otherwise replace the
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192 old binding. */
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193 char *result = binding->codeset;
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194 if (result == NULL || strcmp (codeset, result) != 0)
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195 {
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196 #if defined _LIBC || defined HAVE_STRDUP
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197 result = strdup (codeset);
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198 #else
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199 size_t len = strlen (codeset) + 1;
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200 result = (char *) malloc (len);
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201 if (__builtin_expect (result != NULL, 1))
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202 memcpy (result, codeset, len);
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203 #endif
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204
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205 if (__builtin_expect (result != NULL, 1))
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206 {
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207 if (binding->codeset != NULL)
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208 free (binding->codeset);
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209
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210 binding->codeset = result;
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211 binding->codeset_cntr++;
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212 modified = 1;
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213 }
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214 }
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215 *codesetp = result;
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216 }
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217 }
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218 }
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219 else if ((dirnamep == NULL || *dirnamep == NULL)
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220 && (codesetp == NULL || *codesetp == NULL))
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221 {
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222 /* Simply return the default values. */
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223 if (dirnamep)
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224 *dirnamep = INTUSE(_nl_default_dirname);
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225 if (codesetp)
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226 *codesetp = NULL;
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227 }
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228 else
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229 {
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230 /* We have to create a new binding. */
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231 size_t len = strlen (domainname) + 1;
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232 struct binding *new_binding =
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233 (struct binding *) malloc (offsetof (struct binding, domainname) + len);
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234
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235 if (__builtin_expect (new_binding == NULL, 0))
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236 goto failed;
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237
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238 memcpy (new_binding->domainname, domainname, len);
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239
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240 if (dirnamep)
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241 {
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242 const char *dirname = *dirnamep;
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243
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244 if (dirname == NULL)
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245 /* The default value. */
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246 dirname = INTUSE(_nl_default_dirname);
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247 else
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248 {
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249 if (strcmp (dirname, INTUSE(_nl_default_dirname)) == 0)
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250 dirname = INTUSE(_nl_default_dirname);
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251 else
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252 {
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253 char *result;
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254 #if defined _LIBC || defined HAVE_STRDUP
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255 result = strdup (dirname);
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256 if (__builtin_expect (result == NULL, 0))
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257 goto failed_dirname;
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258 #else
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259 size_t len = strlen (dirname) + 1;
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260 result = (char *) malloc (len);
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261 if (__builtin_expect (result == NULL, 0))
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262 goto failed_dirname;
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263 memcpy (result, dirname, len);
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264 #endif
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265 dirname = result;
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266 }
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267 }
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268 *dirnamep = dirname;
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269 new_binding->dirname = (char *) dirname;
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270 }
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271 else
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272 /* The default value. */
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273 new_binding->dirname = (char *) INTUSE(_nl_default_dirname);
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274
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275 new_binding->codeset_cntr = 0;
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276
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277 if (codesetp)
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278 {
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279 const char *codeset = *codesetp;
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280
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281 if (codeset != NULL)
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282 {
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283 char *result;
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284
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285 #if defined _LIBC || defined HAVE_STRDUP
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286 result = strdup (codeset);
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287 if (__builtin_expect (result == NULL, 0))
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288 goto failed_codeset;
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289 #else
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290 size_t len = strlen (codeset) + 1;
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291 result = (char *) malloc (len);
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292 if (__builtin_expect (result == NULL, 0))
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293 goto failed_codeset;
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294 memcpy (result, codeset, len);
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295 #endif
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296 codeset = result;
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297 new_binding->codeset_cntr++;
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298 }
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299 *codesetp = codeset;
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300 new_binding->codeset = (char *) codeset;
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301 }
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302 else
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303 new_binding->codeset = NULL;
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304
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305 /* Now enqueue it. */
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306 if (_nl_domain_bindings == NULL
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307 || strcmp (domainname, _nl_domain_bindings->domainname) < 0)
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308 {
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309 new_binding->next = _nl_domain_bindings;
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310 _nl_domain_bindings = new_binding;
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311 }
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312 else
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313 {
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314 binding = _nl_domain_bindings;
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315 while (binding->next != NULL
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316 && strcmp (domainname, binding->next->domainname) > 0)
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317 binding = binding->next;
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318
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319 new_binding->next = binding->next;
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320 binding->next = new_binding;
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321 }
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322
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323 modified = 1;
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324
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325 /* Here we deal with memory allocation failures. */
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326 if (0)
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327 {
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328 failed_codeset:
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329 if (new_binding->dirname != INTUSE(_nl_default_dirname))
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330 free (new_binding->dirname);
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331 failed_dirname:
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332 free (new_binding);
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333 failed:
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334 if (dirnamep)
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335 *dirnamep = NULL;
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336 if (codesetp)
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337 *codesetp = NULL;
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338 }
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339 }
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340
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341 /* If we modified any binding, we flush the caches. */
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342 if (modified)
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343 ++_nl_msg_cat_cntr;
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344
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345 __libc_rwlock_unlock (_nl_state_lock);
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346 }
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347
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348 /* Specify that the DOMAINNAME message catalog will be found
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349 in DIRNAME rather than in the system locale data base. */
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350 char *
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351 BINDTEXTDOMAIN (domainname, dirname)
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352 const char *domainname;
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353 const char *dirname;
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354 {
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355 set_binding_values (domainname, &dirname, NULL);
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356 return (char *) dirname;
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357 }
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358
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359 /* Specify the character encoding in which the messages from the
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360 DOMAINNAME message catalog will be returned. */
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361 char *
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362 BIND_TEXTDOMAIN_CODESET (domainname, codeset)
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363 const char *domainname;
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364 const char *codeset;
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365 {
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366 set_binding_values (domainname, NULL, &codeset);
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367 return (char *) codeset;
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368 }
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369
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370 #ifdef _LIBC
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371 /* Aliases for function names in GNU C Library. */
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372 weak_alias (__bindtextdomain, bindtextdomain);
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373 weak_alias (__bind_textdomain_codeset, bind_textdomain_codeset);
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374 #endif
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