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setlocale.c revision 1.11 
      1 /*	$NetBSD: setlocale.c,v 1.11 1997/06/02 09:52:50 kleink Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1991, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * This code is derived from software contributed to Berkeley by
      8  * Paul Borman at Krystal Technologies.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *	This product includes software developed by the University of
     21  *	California, Berkeley and its contributors.
     22  * 4. Neither the name of the University nor the names of its contributors
     23  *    may be used to endorse or promote products derived from this software
     24  *    without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     36  * SUCH DAMAGE.
     37  */
     38 
     39 #if defined(LIBC_SCCS) && !defined(lint)
     40 #if 0
     41 static char sccsid[] = "@(#)setlocale.c	8.1 (Berkeley) 7/4/93";
     42 #else
     43 static char rcsid[] = "$NetBSD: setlocale.c,v 1.11 1997/06/02 09:52:50 kleink Exp $";
     44 #endif
     45 #endif /* LIBC_SCCS and not lint */
     46 
     47 #define _CTYPE_PRIVATE
     48 
     49 #include <sys/localedef.h>
     50 #include <ctype.h>
     51 #include <limits.h>
     52 #include <locale.h>
     53 #include <paths.h>
     54 #include <stdio.h>
     55 #include <stdlib.h>
     56 #include <string.h>
     57 #include "ctypeio.h"
     58 
     59 /*
     60  * Category names for getenv()
     61  */
     62 static char *categories[_LC_LAST] = {
     63     "LC_ALL",
     64     "LC_COLLATE",
     65     "LC_CTYPE",
     66     "LC_MONETARY",
     67     "LC_NUMERIC",
     68     "LC_TIME",
     69     "LC_MESSAGES"
     70 };
     71 
     72 /*
     73  * Current locales for each category
     74  */
     75 static char current_categories[_LC_LAST][32] = {
     76     "C",
     77     "C",
     78     "C",
     79     "C",
     80     "C",
     81     "C",
     82     "C"
     83 };
     84 
     85 /*
     86  * The locales we are going to try and load
     87  */
     88 static char new_categories[_LC_LAST][32];
     89 
     90 static char current_locale_string[_LC_LAST * 33];
     91 static char *PathLocale;
     92 
     93 static char	*currentlocale __P((void));
     94 static char	*loadlocale __P((int));
     95 
     96 char *
     97 setlocale(category, locale)
     98 	int category;
     99 	const char *locale;
    100 {
    101 	int i, len;
    102 	char *env, *r;
    103 
    104 	/*
    105 	 * XXX potential security problem here with set-id programs
    106 	 * being able to read files the user can not normally read.
    107 	 */
    108 	if (!PathLocale && !(PathLocale = getenv("PATH_LOCALE")))
    109 		PathLocale = _PATH_LOCALE;
    110 
    111 	if (category < 0 || category >= _LC_LAST)
    112 		return (NULL);
    113 
    114 	if (!locale)
    115 		return (category ?
    116 		    current_categories[category] : currentlocale());
    117 
    118 	/*
    119 	 * Default to the current locale for everything.
    120 	 */
    121 	for (i = 1; i < _LC_LAST; ++i)
    122 		(void)strncpy(new_categories[i], current_categories[i],
    123 		    sizeof(new_categories[i]) - 1);
    124 
    125 	/*
    126 	 * Now go fill up new_categories from the locale argument
    127 	 */
    128 	if (!*locale) {
    129 		env = getenv(categories[category]);
    130 
    131 		if (!env || !*env)
    132 			env = getenv(categories[0]);
    133 
    134 		if (!env || !*env)
    135 			env = getenv("LANG");
    136 
    137 		if (!env || !*env)
    138 			env = "C";
    139 
    140 		(void)strncpy(new_categories[category], env, 31);
    141 		new_categories[category][31] = 0;
    142 		if (!category) {
    143 			for (i = 1; i < _LC_LAST; ++i) {
    144 				if (!(env = getenv(categories[i])) || !*env)
    145 					env = new_categories[0];
    146 				(void)strncpy(new_categories[i], env, 31);
    147 				new_categories[i][31] = 0;
    148 			}
    149 		}
    150 	} else if (category) {
    151 		(void)strncpy(new_categories[category], locale, 31);
    152 		new_categories[category][31] = 0;
    153 	} else {
    154 		if ((r = strchr(locale, '/')) == 0) {
    155 			for (i = 1; i < _LC_LAST; ++i) {
    156 				(void)strncpy(new_categories[i], locale, 31);
    157 				new_categories[i][31] = 0;
    158 			}
    159 		} else {
    160 			for (i = 1; r[1] == '/'; ++r);
    161 			if (!r[1])
    162 				return (NULL);	/* Hmm, just slashes... */
    163 			do {
    164 				len = r - locale > 31 ? 31 : r - locale;
    165 				(void)strncpy(new_categories[i++], locale, len);
    166 				new_categories[i++][len] = 0;
    167 				locale = r;
    168 				while (*locale == '/')
    169 				    ++locale;
    170 				while (*++r && *r != '/');
    171 			} while (*locale);
    172 			while (i < _LC_LAST)
    173 				(void)strncpy(new_categories[i],
    174 				    new_categories[i-1],
    175 				    sizeof(new_categories[i]) - 1);
    176 		}
    177 	}
    178 
    179 	if (category)
    180 		return (loadlocale(category));
    181 
    182 	for (i = 1; i < _LC_LAST; ++i)
    183 		if (loadlocale(i) == NULL)
    184 			return (NULL);
    185 
    186 	return (currentlocale());
    187 }
    188 
    189 static char *
    190 currentlocale()
    191 {
    192 	int i;
    193 
    194 	(void)strncpy(current_locale_string, current_categories[1],
    195 	    sizeof(current_locale_string) - 1);
    196 
    197 	for (i = 2; i < _LC_LAST; ++i)
    198 		if (strcmp(current_categories[1], current_categories[i])) {
    199 			(void)snprintf(current_locale_string,
    200 			    sizeof(current_locale_string), "%s/%s/%s/%s/%s",
    201 			    current_categories[1], current_categories[2],
    202 			    current_categories[3], current_categories[4],
    203 			    current_categories[5]);
    204 			break;
    205 		}
    206 	return (current_locale_string);
    207 }
    208 
    209 char *
    210 loadlocale(category)
    211 	int category;
    212 {
    213 	char name[PATH_MAX];
    214 
    215 	if (strcmp(new_categories[category], current_categories[category]) == 0)
    216 		return (current_categories[category]);
    217 
    218 	if (!strcmp(new_categories[category], "C") ||
    219 	    !strcmp(new_categories[category], "POSIX")) {
    220 
    221 		switch (category) {
    222 		case LC_CTYPE:
    223 			if (_ctype_ != _C_ctype_) {
    224 				free((void *)_ctype_);
    225 				_ctype_ = _C_ctype_;
    226 			}
    227 			if (_toupper_tab_ != _C_toupper_) {
    228 				free((void *)_toupper_tab_);
    229 				_toupper_tab_ = _C_toupper_;
    230 			}
    231 			if (_tolower_tab_ != _C_tolower_) {
    232 				free((void *)_tolower_tab_);
    233 				_tolower_tab_ = _C_tolower_;
    234 			}
    235 		}
    236 
    237 		(void)strncpy(current_categories[category],
    238 		    new_categories[category],
    239 		    sizeof(current_categories[category]) - 1);
    240 		return current_categories[category];
    241 	}
    242 
    243 	/*
    244 	 * Some day we will actually look at this file.
    245 	 */
    246 	(void)snprintf(name, sizeof(name), "%s/%s/%s",
    247 	    PathLocale, new_categories[category], categories[category]);
    248 
    249 	switch (category) {
    250 	case LC_CTYPE:
    251 		if (__loadctype(name)) {
    252 			(void)strncpy(current_categories[category],
    253 			    new_categories[category],
    254 			    sizeof(current_categories[category]) - 1);
    255 			return current_categories[category];
    256 		}
    257 		return NULL;
    258 
    259 	case LC_COLLATE:
    260 	case LC_MESSAGES:
    261 	case LC_MONETARY:
    262 	case LC_NUMERIC:
    263 	case LC_TIME:
    264 		return NULL;
    265 	}
    266 
    267 	return NULL;
    268 }
    269