1/* nls.c -- skeletal internationalization code. */ 2 3/* Copyright (C) 1996 Free Software Foundation, Inc. 4 5 This file is part of the GNU Readline Library, a library for 6 reading lines of text with interactive input and history editing. 7 8 The GNU Readline Library is free software; you can redistribute it 9 and/or modify it under the terms of the GNU General Public License 10 as published by the Free Software Foundation; either version 2, or 11 (at your option) any later version. 12 13 The GNU Readline Library is distributed in the hope that it will be 14 useful, but WITHOUT ANY WARRANTY; without even the implied warranty 15 of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 GNU General Public License for more details. 17 18 The GNU General Public License is often shipped with GNU software, and 19 is generally kept in a file called COPYING or LICENSE. If you do not 20 have a copy of the license, write to the Free Software Foundation, 21 59 Temple Place, Suite 330, Boston, MA 02111 USA. */ 22#define READLINE_LIBRARY 23 24#if defined (HAVE_CONFIG_H) 25# include <config.h> 26#endif 27 28#include <sys/types.h> 29 30#include <stdio.h> 31 32#if defined (HAVE_UNISTD_H) 33# include <unistd.h> 34#endif /* HAVE_UNISTD_H */ 35 36#if defined (HAVE_STDLIB_H) 37# include <stdlib.h> 38#else 39# include "ansi_stdlib.h" 40#endif /* HAVE_STDLIB_H */ 41 42#if defined (HAVE_LOCALE_H) 43# include <locale.h> 44#endif 45 46#include <ctype.h> 47 48#include "rldefs.h" 49#include "readline.h" 50#include "rlshell.h" 51#include "rlprivate.h" 52 53#if !defined (HAVE_SETLOCALE) 54/* A list of legal values for the LANG or LC_CTYPE environment variables. 55 If a locale name in this list is the value for the LC_ALL, LC_CTYPE, 56 or LANG environment variable (using the first of those with a value), 57 readline eight-bit mode is enabled. */ 58static char *legal_lang_values[] = 59{ 60 "iso88591", 61 "iso88592", 62 "iso88593", 63 "iso88594", 64 "iso88595", 65 "iso88596", 66 "iso88597", 67 "iso88598", 68 "iso88599", 69 "iso885910", 70 "koi8r", 71 0 72}; 73 74static char *normalize_codeset PARAMS((char *)); 75static char *find_codeset PARAMS((char *, size_t *)); 76#endif /* !HAVE_SETLOCALE */ 77 78static char *_rl_get_locale_var PARAMS((const char *)); 79 80static char * 81_rl_get_locale_var (v) 82 const char *v; 83{ 84 char *lspec; 85 86 lspec = sh_get_env_value ("LC_ALL"); 87 if (lspec == 0 || *lspec == 0) 88 lspec = sh_get_env_value (v); 89 if (lspec == 0 || *lspec == 0) 90 lspec = sh_get_env_value ("LANG"); 91 92 return lspec; 93} 94 95/* Check for LC_ALL, LC_CTYPE, and LANG and use the first with a value 96 to decide the defaults for 8-bit character input and output. Returns 97 1 if we set eight-bit mode. */ 98int 99_rl_init_eightbit () 100{ 101/* If we have setlocale(3), just check the current LC_CTYPE category 102 value, and go into eight-bit mode if it's not C or POSIX. */ 103#if defined (HAVE_SETLOCALE) 104 char *lspec, *t; 105 106 /* Set the LC_CTYPE locale category from environment variables. */ 107 lspec = _rl_get_locale_var ("LC_CTYPE"); 108 /* Since _rl_get_locale_var queries the right environment variables, 109 we query the current locale settings with setlocale(), and, if 110 that doesn't return anything, we set lspec to the empty string to 111 force the subsequent call to setlocale() to define the `native' 112 environment. */ 113 if (lspec == 0 || *lspec == 0) 114 lspec = setlocale (LC_CTYPE, (char *)NULL); 115 if (lspec == 0) 116 lspec = ""; 117 t = setlocale (LC_CTYPE, lspec); 118 119 if (t && *t && (t[0] != 'C' || t[1]) && (STREQ (t, "POSIX") == 0)) 120 { 121 _rl_meta_flag = 1; 122 _rl_convert_meta_chars_to_ascii = 0; 123 _rl_output_meta_chars = 1; 124 return (1); 125 } 126 else 127 return (0); 128 129#else /* !HAVE_SETLOCALE */ 130 char *lspec, *t; 131 int i; 132 133 /* We don't have setlocale. Finesse it. Check the environment for the 134 appropriate variables and set eight-bit mode if they have the right 135 values. */ 136 lspec = _rl_get_locale_var ("LC_CTYPE"); 137 138 if (lspec == 0 || (t = normalize_codeset (lspec)) == 0) 139 return (0); 140 for (i = 0; t && legal_lang_values[i]; i++) 141 if (STREQ (t, legal_lang_values[i])) 142 { 143 _rl_meta_flag = 1; 144 _rl_convert_meta_chars_to_ascii = 0; 145 _rl_output_meta_chars = 1; 146 break; 147 } 148 free (t); 149 return (legal_lang_values[i] ? 1 : 0); 150 151#endif /* !HAVE_SETLOCALE */ 152} 153 154#if !defined (HAVE_SETLOCALE) 155static char * 156normalize_codeset (codeset) 157 char *codeset; 158{ 159 size_t namelen, i; 160 int len, all_digits; 161 char *wp, *retval; 162 163 codeset = find_codeset (codeset, &namelen); 164 165 if (codeset == 0) 166 return (codeset); 167 168 all_digits = 1; 169 for (len = 0, i = 0; i < namelen; i++) 170 { 171 if (ISALNUM ((unsigned char)codeset[i])) 172 { 173 len++; 174 all_digits &= _rl_digit_p (codeset[i]); 175 } 176 } 177 178 retval = (char *)malloc ((all_digits ? 3 : 0) + len + 1); 179 if (retval == 0) 180 return ((char *)0); 181 182 wp = retval; 183 /* Add `iso' to beginning of an all-digit codeset */ 184 if (all_digits) 185 { 186 *wp++ = 'i'; 187 *wp++ = 's'; 188 *wp++ = 'o'; 189 } 190 191 for (i = 0; i < namelen; i++) 192 if (ISALPHA ((unsigned char)codeset[i])) 193 *wp++ = _rl_to_lower (codeset[i]); 194 else if (_rl_digit_p (codeset[i])) 195 *wp++ = codeset[i]; 196 *wp = '\0'; 197 198 return retval; 199} 200 201/* Isolate codeset portion of locale specification. */ 202static char * 203find_codeset (name, lenp) 204 char *name; 205 size_t *lenp; 206{ 207 char *cp, *language, *result; 208 209 cp = language = name; 210 result = (char *)0; 211 212 while (*cp && *cp != '_' && *cp != '@' && *cp != '+' && *cp != ',') 213 cp++; 214 215 /* This does not make sense: language has to be specified. As 216 an exception we allow the variable to contain only the codeset 217 name. Perhaps there are funny codeset names. */ 218 if (language == cp) 219 { 220 *lenp = strlen (language); 221 result = language; 222 } 223 else 224 { 225 /* Next is the territory. */ 226 if (*cp == '_') 227 do 228 ++cp; 229 while (*cp && *cp != '.' && *cp != '@' && *cp != '+' && *cp != ',' && *cp != '_'); 230 231 /* Now, finally, is the codeset. */ 232 result = cp; 233 if (*cp == '.') 234 do 235 ++cp; 236 while (*cp && *cp != '@'); 237 238 if (cp - result > 2) 239 { 240 result++; 241 *lenp = cp - result; 242 } 243 else 244 { 245 *lenp = strlen (language); 246 result = language; 247 } 248 } 249 250 return result; 251} 252#endif /* !HAVE_SETLOCALE */ 253