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0
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1 /* Determine a canonical name for the current locale's character encoding.
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2
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3 Copyright (C) 2000-2003 Free Software Foundation, Inc.
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4
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5 This program is free software; you can redistribute it and/or modify it
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6 under the terms of the GNU Library General Public License as published
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7 by the Free Software Foundation; either version 2, or (at your option)
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8 any later version.
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9
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10 This program is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Library General Public License for more details.
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14
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15 You should have received a copy of the GNU Library General Public
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16 License along with this program; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301,
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18 USA. */
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19
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20 /* Written by Bruno Haible <bruno@clisp.org>. */
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21
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22 #ifdef HAVE_CONFIG_H
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23 # include <config.h>
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24 #endif
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25
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26 /* Specification. */
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27 #include "localcharset.h"
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28
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29 #if HAVE_STDDEF_H
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30 # include <stddef.h>
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31 #endif
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32
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33 #include <stdio.h>
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34 #if HAVE_STRING_H
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35 # include <string.h>
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36 #else
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37 # include <strings.h>
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38 #endif
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39 #if HAVE_STDLIB_H
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40 # include <stdlib.h>
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41 #endif
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42
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43 #if defined _WIN32 || defined __WIN32__
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44 # undef WIN32 /* avoid warning on mingw32 */
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45 # define WIN32
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46 #endif
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47
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48 #if defined __EMX__
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49 /* Assume EMX program runs on OS/2, even if compiled under DOS. */
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50 # define OS2
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51 #endif
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52
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53 #if !defined WIN32
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54 # if HAVE_LANGINFO_CODESET
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55 # include <langinfo.h>
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56 # else
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57 # if HAVE_SETLOCALE
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58 # include <locale.h>
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59 # endif
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60 # endif
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61 #elif defined WIN32
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62 # define WIN32_LEAN_AND_MEAN
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63 # include <windows.h>
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64 #endif
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65 #if defined OS2
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66 # define INCL_DOS
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67 # include <os2.h>
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68 #endif
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69
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70 #if ENABLE_RELOCATABLE
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71 # include "relocatable.h"
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72 #else
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73 # define relocate(pathname) (pathname)
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74 #endif
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75
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76 #if defined _WIN32 || defined __WIN32__ || defined __EMX__ || defined __DJGPP__
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77 /* Win32, OS/2, DOS */
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78 # define ISSLASH(C) ((C) == '/' || (C) == '\\')
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79 #endif
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80
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81 #ifndef DIRECTORY_SEPARATOR
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82 # define DIRECTORY_SEPARATOR '/'
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83 #endif
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84
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85 #ifndef ISSLASH
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86 # define ISSLASH(C) ((C) == DIRECTORY_SEPARATOR)
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87 #endif
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88
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89 #ifdef HAVE_GETC_UNLOCKED
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90 # undef getc
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91 # define getc getc_unlocked
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92 #endif
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93
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94 /* The following static variable is declared 'volatile' to avoid a
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95 possible multithread problem in the function get_charset_aliases. If we
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96 are running in a threaded environment, and if two threads initialize
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97 'charset_aliases' simultaneously, both will produce the same value,
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98 and everything will be ok if the two assignments to 'charset_aliases'
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99 are atomic. But I don't know what will happen if the two assignments mix. */
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100 #if __STDC__ != 1
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101 # define volatile /* empty */
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102 #endif
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103 /* Pointer to the contents of the charset.alias file, if it has already been
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104 read, else NULL. Its format is:
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105 ALIAS_1 '\0' CANONICAL_1 '\0' ... ALIAS_n '\0' CANONICAL_n '\0' '\0' */
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106 static const char * volatile charset_aliases;
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107
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108 /* Return a pointer to the contents of the charset.alias file. */
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109 static const char *
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110 get_charset_aliases ()
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111 {
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112 const char *cp;
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113
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114 cp = charset_aliases;
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115 if (cp == NULL)
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116 {
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117 #if !(defined VMS || defined WIN32)
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118 FILE *fp;
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119 const char *dir = relocate (LIBDIR);
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120 const char *base = "charset.alias";
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121 char *file_name;
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122
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123 /* Concatenate dir and base into freshly allocated file_name. */
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124 {
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125 size_t dir_len = strlen (dir);
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126 size_t base_len = strlen (base);
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127 int add_slash = (dir_len > 0 && !ISSLASH (dir[dir_len - 1]));
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128 file_name = (char *) malloc (dir_len + add_slash + base_len + 1);
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129 if (file_name != NULL)
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130 {
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131 memcpy (file_name, dir, dir_len);
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132 if (add_slash)
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133 file_name[dir_len] = DIRECTORY_SEPARATOR;
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134 memcpy (file_name + dir_len + add_slash, base, base_len + 1);
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135 }
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136 }
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137
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138 if (file_name == NULL || (fp = fopen (file_name, "r")) == NULL)
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139 /* Out of memory or file not found, treat it as empty. */
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140 cp = "";
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141 else
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142 {
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143 /* Parse the file's contents. */
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144 int c;
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145 char buf1[50+1];
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146 char buf2[50+1];
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147 char *res_ptr = NULL;
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148 size_t res_size = 0;
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149 size_t l1, l2;
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150
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151 for (;;)
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152 {
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153 c = getc (fp);
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154 if (c == EOF)
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155 break;
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156 if (c == '\n' || c == ' ' || c == '\t')
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157 continue;
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158 if (c == '#')
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159 {
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160 /* Skip comment, to end of line. */
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161 do
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162 c = getc (fp);
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163 while (!(c == EOF || c == '\n'));
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164 if (c == EOF)
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165 break;
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166 continue;
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167 }
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168 ungetc (c, fp);
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169 if (fscanf (fp, "%50s %50s", buf1, buf2) < 2)
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170 break;
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171 l1 = strlen (buf1);
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172 l2 = strlen (buf2);
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173 if (res_size == 0)
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174 {
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175 res_size = l1 + 1 + l2 + 1;
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176 res_ptr = (char *) malloc (res_size + 1);
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177 }
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178 else
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179 {
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180 res_size += l1 + 1 + l2 + 1;
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181 res_ptr = (char *) realloc (res_ptr, res_size + 1);
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182 }
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183 if (res_ptr == NULL)
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184 {
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185 /* Out of memory. */
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186 res_size = 0;
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187 break;
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188 }
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189 strcpy (res_ptr + res_size - (l2 + 1) - (l1 + 1), buf1);
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190 strcpy (res_ptr + res_size - (l2 + 1), buf2);
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191 }
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192 fclose (fp);
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193 if (res_size == 0)
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194 cp = "";
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195 else
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196 {
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197 *(res_ptr + res_size) = '\0';
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198 cp = res_ptr;
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199 }
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200 }
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201
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202 if (file_name != NULL)
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203 free (file_name);
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204
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205 #else
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206
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207 # if defined VMS
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208 /* To avoid the troubles of an extra file charset.alias_vms in the
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209 sources of many GNU packages, simply inline the aliases here. */
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210 /* The list of encodings is taken from the OpenVMS 7.3-1 documentation
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211 "Compaq C Run-Time Library Reference Manual for OpenVMS systems"
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212 section 10.7 "Handling Different Character Sets". */
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213 cp = "ISO8859-1" "\0" "ISO-8859-1" "\0"
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214 "ISO8859-2" "\0" "ISO-8859-2" "\0"
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215 "ISO8859-5" "\0" "ISO-8859-5" "\0"
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216 "ISO8859-7" "\0" "ISO-8859-7" "\0"
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217 "ISO8859-8" "\0" "ISO-8859-8" "\0"
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218 "ISO8859-9" "\0" "ISO-8859-9" "\0"
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219 /* Japanese */
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220 "eucJP" "\0" "EUC-JP" "\0"
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221 "SJIS" "\0" "SHIFT_JIS" "\0"
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222 "DECKANJI" "\0" "DEC-KANJI" "\0"
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223 "SDECKANJI" "\0" "EUC-JP" "\0"
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224 /* Chinese */
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225 "eucTW" "\0" "EUC-TW" "\0"
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226 "DECHANYU" "\0" "DEC-HANYU" "\0"
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227 "DECHANZI" "\0" "GB2312" "\0"
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228 /* Korean */
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229 "DECKOREAN" "\0" "EUC-KR" "\0";
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230 # endif
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231
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232 # if defined WIN32
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233 /* To avoid the troubles of installing a separate file in the same
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234 directory as the DLL and of retrieving the DLL's directory at
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235 runtime, simply inline the aliases here. */
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236
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237 cp = "CP936" "\0" "GBK" "\0"
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238 "CP1361" "\0" "JOHAB" "\0"
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239 "CP20127" "\0" "ASCII" "\0"
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240 "CP20866" "\0" "KOI8-R" "\0"
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241 "CP21866" "\0" "KOI8-RU" "\0"
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242 "CP28591" "\0" "ISO-8859-1" "\0"
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243 "CP28592" "\0" "ISO-8859-2" "\0"
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244 "CP28593" "\0" "ISO-8859-3" "\0"
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245 "CP28594" "\0" "ISO-8859-4" "\0"
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246 "CP28595" "\0" "ISO-8859-5" "\0"
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247 "CP28596" "\0" "ISO-8859-6" "\0"
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248 "CP28597" "\0" "ISO-8859-7" "\0"
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249 "CP28598" "\0" "ISO-8859-8" "\0"
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250 "CP28599" "\0" "ISO-8859-9" "\0"
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251 "CP28605" "\0" "ISO-8859-15" "\0";
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252 # endif
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253 #endif
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254
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255 charset_aliases = cp;
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256 }
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257
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258 return cp;
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259 }
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260
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261 /* Determine the current locale's character encoding, and canonicalize it
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262 into one of the canonical names listed in config.charset.
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263 The result must not be freed; it is statically allocated.
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264 If the canonical name cannot be determined, the result is a non-canonical
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265 name. */
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266
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267 #ifdef STATIC
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268 STATIC
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269 #endif
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270 const char *
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271 locale_charset ()
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272 {
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273 const char *codeset;
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274 const char *aliases;
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275
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276 #if !(defined WIN32 || defined OS2)
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277
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278 # if HAVE_LANGINFO_CODESET
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279
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280 /* Most systems support nl_langinfo (CODESET) nowadays. */
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281 codeset = nl_langinfo (CODESET);
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282
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283 # else
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284
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285 /* On old systems which lack it, use setlocale or getenv. */
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286 const char *locale = NULL;
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287
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288 /* But most old systems don't have a complete set of locales. Some
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289 (like SunOS 4 or DJGPP) have only the C locale. Therefore we don't
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290 use setlocale here; it would return "C" when it doesn't support the
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291 locale name the user has set. */
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292 # if HAVE_SETLOCALE && 0
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293 locale = setlocale (LC_CTYPE, NULL);
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294 # endif
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295 if (locale == NULL || locale[0] == '\0')
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296 {
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297 locale = getenv ("LC_ALL");
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298 if (locale == NULL || locale[0] == '\0')
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299 {
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300 locale = getenv ("LC_CTYPE");
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301 if (locale == NULL || locale[0] == '\0')
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302 locale = getenv ("LANG");
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303 }
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304 }
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305
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306 /* On some old systems, one used to set locale = "iso8859_1". On others,
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307 you set it to "language_COUNTRY.charset". In any case, we resolve it
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308 through the charset.alias file. */
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309 codeset = locale;
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310
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311 # endif
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312
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313 #elif defined WIN32
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314
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315 static char buf[2 + 10 + 1];
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316
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317 /* Woe32 has a function returning the locale's codepage as a number. */
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318 sprintf (buf, "CP%u", GetACP ());
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319 codeset = buf;
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320
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321 #elif defined OS2
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322
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323 const char *locale;
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324 static char buf[2 + 10 + 1];
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325 ULONG cp[3];
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326 ULONG cplen;
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327
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328 /* Allow user to override the codeset, as set in the operating system,
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329 with standard language environment variables. */
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330 locale = getenv ("LC_ALL");
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331 if (locale == NULL || locale[0] == '\0')
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332 {
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333 locale = getenv ("LC_CTYPE");
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334 if (locale == NULL || locale[0] == '\0')
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335 locale = getenv ("LANG");
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336 }
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337 if (locale != NULL && locale[0] != '\0')
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338 {
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339 /* If the locale name contains an encoding after the dot, return it. */
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340 const char *dot = strchr (locale, '.');
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341
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342 if (dot != NULL)
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343 {
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344 const char *modifier;
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345
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346 dot++;
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347 /* Look for the possible @... trailer and remove it, if any. */
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348 modifier = strchr (dot, '@');
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349 if (modifier == NULL)
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350 return dot;
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351 if (modifier - dot < sizeof (buf))
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352 {
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353 memcpy (buf, dot, modifier - dot);
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354 buf [modifier - dot] = '\0';
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355 return buf;
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356 }
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357 }
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358
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359 /* Resolve through the charset.alias file. */
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360 codeset = locale;
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361 }
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362 else
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363 {
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364 /* OS/2 has a function returning the locale's codepage as a number. */
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365 if (DosQueryCp (sizeof (cp), cp, &cplen))
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366 codeset = "";
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367 else
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368 {
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369 sprintf (buf, "CP%u", cp[0]);
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370 codeset = buf;
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371 }
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372 }
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373
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374 #endif
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375
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376 if (codeset == NULL)
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377 /* The canonical name cannot be determined. */
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378 codeset = "";
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379
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380 /* Resolve alias. */
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381 for (aliases = get_charset_aliases ();
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382 *aliases != '\0';
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383 aliases += strlen (aliases) + 1, aliases += strlen (aliases) + 1)
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384 if (strcmp (codeset, aliases) == 0
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385 || (aliases[0] == '*' && aliases[1] == '\0'))
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386 {
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387 codeset = aliases + strlen (aliases) + 1;
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388 break;
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389 }
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390
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391 /* Don't return an empty string. GNU libc and GNU libiconv interpret
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392 the empty string as denoting "the locale's character encoding",
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393 thus GNU libiconv would call this function a second time. */
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394 if (codeset[0] == '\0')
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395 codeset = "ASCII";
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396
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397 return codeset;
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398 }
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