1 | /* nls.c -- skeletal internationalization code. */ |
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2 | |
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3 | /* Copyright (C) 1996 Free Software Foundation, Inc. |
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4 | |
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5 | This file is part of the GNU Readline Library, a library for |
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6 | reading lines of text with interactive input and history editing. |
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7 | |
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8 | The GNU Readline Library is free software; you can redistribute it |
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9 | and/or modify it under the terms of the GNU General Public License |
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10 | as published by the Free Software Foundation; either version 1, or |
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11 | (at your option) any later version. |
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12 | |
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13 | The GNU Readline Library is distributed in the hope that it will be |
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14 | useful, but WITHOUT ANY WARRANTY; without even the implied warranty |
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15 | of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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16 | GNU General Public License for more details. |
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17 | |
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18 | The GNU General Public License is often shipped with GNU software, and |
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19 | is generally kept in a file called COPYING or LICENSE. If you do not |
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20 | have a copy of the license, write to the Free Software Foundation, |
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21 | 675 Mass Ave, Cambridge, MA 02139, USA. */ |
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22 | #define READLINE_LIBRARY |
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23 | |
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24 | #if defined (HAVE_CONFIG_H) |
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25 | # include <config.h> |
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26 | #endif |
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27 | |
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28 | #include <sys/types.h> |
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29 | |
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30 | #if defined (HAVE_UNISTD_H) |
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31 | # include <unistd.h> |
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32 | #endif /* HAVE_UNISTD_H */ |
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33 | |
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34 | #if defined (HAVE_STDLIB_H) |
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35 | # include <stdlib.h> |
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36 | #else |
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37 | # include "ansi_stdlib.h" |
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38 | #endif /* HAVE_STDLIB_H */ |
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39 | |
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40 | #if defined (HAVE_LOCALE_H) |
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41 | # include <locale.h> |
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42 | #endif |
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43 | |
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44 | #include <ctype.h> |
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45 | |
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46 | #include "rldefs.h" |
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47 | |
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48 | extern int _rl_convert_meta_chars_to_ascii; |
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49 | extern int _rl_output_meta_chars; |
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50 | extern int _rl_meta_flag; |
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51 | |
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52 | /* Functions imported from shell.c */ |
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53 | extern char *get_env_value (); |
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54 | |
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55 | #if !defined (HAVE_SETLOCALE) |
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56 | /* A list of legal values for the LANG or LC_CTYPE environment variables. |
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57 | If a locale name in this list is the value for the LC_ALL, LC_CTYPE, |
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58 | or LANG environment variable (using the first of those with a value), |
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59 | readline eight-bit mode is enabled. */ |
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60 | static char *legal_lang_values[] = |
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61 | { |
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62 | "iso88591", |
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63 | "iso88592", |
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64 | "iso88593", |
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65 | "iso88594", |
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66 | "iso88595", |
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67 | "iso88596", |
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68 | "iso88597", |
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69 | "iso88598", |
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70 | "iso88599", |
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71 | "iso885910", |
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72 | "koi8r", |
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73 | "koi8-r", |
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74 | 0 |
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75 | }; |
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76 | |
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77 | static char *normalize_codeset (); |
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78 | static char *find_codeset (); |
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79 | #endif /* !HAVE_SETLOCALE */ |
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80 | |
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81 | /* Check for LC_ALL, LC_CTYPE, and LANG and use the first with a value |
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82 | to decide the defaults for 8-bit character input and output. Returns |
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83 | 1 if we set eight-bit mode. */ |
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84 | int |
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85 | _rl_init_eightbit () |
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86 | { |
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87 | /* If we have setlocale(3), just check the current LC_CTYPE category |
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88 | value, and go into eight-bit mode if it's not C or POSIX. */ |
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89 | #if defined (HAVE_SETLOCALE) |
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90 | char *t; |
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91 | |
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92 | /* Set the LC_CTYPE locale category from environment variables. */ |
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93 | t = setlocale (LC_CTYPE, ""); |
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94 | if (t && *t && (t[0] != 'C' || t[1]) && (STREQ (t, "POSIX") == 0)) |
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95 | { |
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96 | _rl_meta_flag = 1; |
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97 | _rl_convert_meta_chars_to_ascii = 0; |
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98 | _rl_output_meta_chars = 1; |
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99 | return (1); |
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100 | } |
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101 | else |
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102 | return (0); |
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103 | |
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104 | #else /* !HAVE_SETLOCALE */ |
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105 | char *lspec, *t; |
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106 | int i; |
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107 | |
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108 | /* We don't have setlocale. Finesse it. Check the environment for the |
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109 | appropriate variables and set eight-bit mode if they have the right |
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110 | values. */ |
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111 | lspec = get_env_value ("LC_ALL"); |
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112 | if (lspec == 0) lspec = get_env_value ("LC_CTYPE"); |
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113 | if (lspec == 0) lspec = get_env_value ("LANG"); |
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114 | if (lspec == 0 || (t = normalize_codeset (lspec)) == 0) |
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115 | return (0); |
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116 | for (i = 0; t && legal_lang_values[i]; i++) |
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117 | if (STREQ (t, legal_lang_values[i])) |
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118 | { |
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119 | _rl_meta_flag = 1; |
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120 | _rl_convert_meta_chars_to_ascii = 0; |
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121 | _rl_output_meta_chars = 1; |
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122 | break; |
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123 | } |
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124 | free (t); |
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125 | return (legal_lang_values[i] ? 1 : 0); |
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126 | |
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127 | #endif /* !HAVE_SETLOCALE */ |
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128 | } |
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129 | |
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130 | #if !defined (HAVE_SETLOCALE) |
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131 | static char * |
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132 | normalize_codeset (codeset) |
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133 | char *codeset; |
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134 | { |
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135 | size_t namelen, i; |
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136 | int len, all_digits; |
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137 | char *wp, *retval; |
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138 | |
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139 | codeset = find_codeset (codeset, &namelen); |
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140 | |
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141 | if (codeset == 0) |
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142 | return (codeset); |
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143 | |
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144 | all_digits = 1; |
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145 | for (len = 0, i = 0; i < namelen; i++) |
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146 | { |
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147 | if (isalnum (codeset[i])) |
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148 | { |
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149 | len++; |
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150 | all_digits &= isdigit (codeset[i]); |
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151 | } |
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152 | } |
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153 | |
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154 | retval = (char *)malloc ((all_digits ? 3 : 0) + len + 1); |
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155 | if (retval == 0) |
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156 | return ((char *)0); |
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157 | |
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158 | wp = retval; |
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159 | /* Add `iso' to beginning of an all-digit codeset */ |
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160 | if (all_digits) |
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161 | { |
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162 | *wp++ = 'i'; |
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163 | *wp++ = 's'; |
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164 | *wp++ = 'o'; |
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165 | } |
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166 | |
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167 | for (i = 0; i < namelen; i++) |
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168 | if (isalpha (codeset[i])) |
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169 | *wp++ = (isupper (codeset[i])) ? tolower (codeset[i]) : codeset[i]; |
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170 | else if (isdigit (codeset[i])) |
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171 | *wp++ = codeset[i]; |
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172 | *wp = '\0'; |
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173 | |
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174 | return retval; |
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175 | } |
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176 | |
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177 | /* Isolate codeset portion of locale specification. */ |
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178 | static char * |
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179 | find_codeset (name, lenp) |
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180 | char *name; |
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181 | size_t *lenp; |
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182 | { |
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183 | char *cp, *language, *result; |
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184 | |
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185 | cp = language = name; |
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186 | result = (char *)0; |
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187 | |
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188 | while (*cp && *cp != '_' && *cp != '@' && *cp != '+' && *cp != ',') |
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189 | cp++; |
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190 | |
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191 | /* This does not make sense: language has to be specified. As |
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192 | an exception we allow the variable to contain only the codeset |
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193 | name. Perhaps there are funny codeset names. */ |
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194 | if (language == cp) |
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195 | { |
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196 | *lenp = strlen (language); |
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197 | result = language; |
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198 | } |
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199 | else |
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200 | { |
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201 | /* Next is the territory. */ |
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202 | if (*cp == '_') |
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203 | do |
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204 | ++cp; |
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205 | while (*cp && *cp != '.' && *cp != '@' && *cp != '+' && *cp != ',' && *cp != '_'); |
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206 | |
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207 | /* Now, finally, is the codeset. */ |
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208 | result = cp; |
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209 | if (*cp == '.') |
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210 | do |
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211 | ++cp; |
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212 | while (*cp && *cp != '@'); |
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213 | |
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214 | if (cp - result > 2) |
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215 | { |
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216 | result++; |
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217 | *lenp = cp - result; |
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218 | } |
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219 | else |
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220 | { |
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221 | *lenp = strlen (language); |
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222 | result = language; |
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223 | } |
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224 | } |
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225 | |
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226 | return result; |
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227 | } |
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228 | #endif /* !HAVE_SETLOCALE */ |
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