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setlocale.c revision 1.14 
      1 /*	$NetBSD: setlocale.c,v 1.14 1998/10/13 14:19:21 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 #include <sys/cdefs.h>
     40 #if defined(LIBC_SCCS) && !defined(lint)
     41 #if 0
     42 static char sccsid[] = "@(#)setlocale.c	8.1 (Berkeley) 7/4/93";
     43 #else
     44 __RCSID("$NetBSD: setlocale.c,v 1.14 1998/10/13 14:19:21 kleink Exp $");
     45 #endif
     46 #endif /* LIBC_SCCS and not lint */
     47 
     48 #define _CTYPE_PRIVATE
     49 
     50 #include "namespace.h"
     51 #include <sys/localedef.h>
     52 #include <ctype.h>
     53 #include <limits.h>
     54 #include <locale.h>
     55 #include <paths.h>
     56 #include <stdio.h>
     57 #include <stdlib.h>
     58 #include <string.h>
     59 #include "ctypeio.h"
     60 
     61 /*
     62  * Category names for getenv()
     63  */
     64 static const char *const categories[_LC_LAST] = {
     65     "LC_ALL",
     66     "LC_COLLATE",
     67     "LC_CTYPE",
     68     "LC_MONETARY",
     69     "LC_NUMERIC",
     70     "LC_TIME",
     71     "LC_MESSAGES"
     72 };
     73 
     74 /*
     75  * Current locales for each category
     76  */
     77 static char current_categories[_LC_LAST][32] = {
     78     "C",
     79     "C",
     80     "C",
     81     "C",
     82     "C",
     83     "C",
     84     "C"
     85 };
     86 
     87 /*
     88  * The locales we are going to try and load
     89  */
     90 static char new_categories[_LC_LAST][32];
     91 
     92 static char current_locale_string[_LC_LAST * 33];
     93 static char *PathLocale;
     94 
     95 static char	*currentlocale __P((void));
     96 static char	*loadlocale __P((int));
     97 
     98 char *
     99 setlocale(category, locale)
    100 	int category;
    101 	const char *locale;
    102 {
    103 	int i, len;
    104 	char *env, *r;
    105 
    106 	/*
    107 	 * XXX potential security problem here with set-id programs
    108 	 * being able to read files the user can not normally read.
    109 	 */
    110 	if (!PathLocale && !(PathLocale = getenv("PATH_LOCALE")))
    111 		PathLocale = _PATH_LOCALE;
    112 
    113 	if (category < 0 || category >= _LC_LAST)
    114 		return (NULL);
    115 
    116 	if (!locale)
    117 		return (category ?
    118 		    current_categories[category] : currentlocale());
    119 
    120 	/*
    121 	 * Default to the current locale for everything.
    122 	 */
    123 	for (i = 1; i < _LC_LAST; ++i)
    124 		(void)strncpy(new_categories[i], current_categories[i],
    125 		    sizeof(new_categories[i]) - 1);
    126 
    127 	/*
    128 	 * Now go fill up new_categories from the locale argument
    129 	 */
    130 	if (!*locale) {
    131 		env = getenv(categories[category]);
    132 
    133 		if (!env || !*env)
    134 			env = getenv(categories[0]);
    135 
    136 		if (!env || !*env)
    137 			env = getenv("LANG");
    138 
    139 		if (!env || !*env)
    140 			env = "C";
    141 
    142 		(void)strncpy(new_categories[category], env, 31);
    143 		new_categories[category][31] = 0;
    144 		if (!category) {
    145 			for (i = 1; i < _LC_LAST; ++i) {
    146 				if (!(env = getenv(categories[i])) || !*env)
    147 					env = new_categories[0];
    148 				(void)strncpy(new_categories[i], env, 31);
    149 				new_categories[i][31] = 0;
    150 			}
    151 		}
    152 	} else if (category) {
    153 		(void)strncpy(new_categories[category], locale, 31);
    154 		new_categories[category][31] = 0;
    155 	} else {
    156 		if ((r = strchr(locale, '/')) == 0) {
    157 			for (i = 1; i < _LC_LAST; ++i) {
    158 				(void)strncpy(new_categories[i], locale, 31);
    159 				new_categories[i][31] = 0;
    160 			}
    161 		} else {
    162 			for (i = 1; r[1] == '/'; ++r);
    163 			if (!r[1])
    164 				return (NULL);	/* Hmm, just slashes... */
    165 			do {
    166 				len = r - locale > 31 ? 31 : r - locale;
    167 				(void)strncpy(new_categories[i++], locale, len);
    168 				new_categories[i++][len] = 0;
    169 				locale = r;
    170 				while (*locale == '/')
    171 				    ++locale;
    172 				while (*++r && *r != '/');
    173 			} while (*locale);
    174 			while (i < _LC_LAST)
    175 				(void)strncpy(new_categories[i],
    176 				    new_categories[i-1],
    177 				    sizeof(new_categories[i]) - 1);
    178 		}
    179 	}
    180 
    181 	if (category)
    182 		return (loadlocale(category));
    183 
    184 	for (i = 1; i < _LC_LAST; ++i)
    185 		if (loadlocale(i) == NULL)
    186 			return (NULL);
    187 
    188 	return (currentlocale());
    189 }
    190 
    191 static char *
    192 currentlocale()
    193 {
    194 	int i;
    195 
    196 	(void)strncpy(current_locale_string, current_categories[1],
    197 	    sizeof(current_locale_string) - 1);
    198 
    199 	for (i = 2; i < _LC_LAST; ++i)
    200 		if (strcmp(current_categories[1], current_categories[i])) {
    201 			(void)snprintf(current_locale_string,
    202 			    sizeof(current_locale_string), "%s/%s/%s/%s/%s",
    203 			    current_categories[1], current_categories[2],
    204 			    current_categories[3], current_categories[4],
    205 			    current_categories[5]);
    206 			break;
    207 		}
    208 	return (current_locale_string);
    209 }
    210 
    211 char *
    212 loadlocale(category)
    213 	int category;
    214 {
    215 	char name[PATH_MAX];
    216 
    217 	if (strcmp(new_categories[category], current_categories[category]) == 0)
    218 		return (current_categories[category]);
    219 
    220 	if (!strcmp(new_categories[category], "C") ||
    221 	    !strcmp(new_categories[category], "POSIX")) {
    222 
    223 		switch (category) {
    224 		case LC_CTYPE:
    225 			if (_ctype_ != _C_ctype_) {
    226 				free((void *)_ctype_);
    227 				_ctype_ = _C_ctype_;
    228 			}
    229 			if (_toupper_tab_ != _C_toupper_) {
    230 				free((void *)_toupper_tab_);
    231 				_toupper_tab_ = _C_toupper_;
    232 			}
    233 			if (_tolower_tab_ != _C_tolower_) {
    234 				free((void *)_tolower_tab_);
    235 				_tolower_tab_ = _C_tolower_;
    236 			}
    237 		}
    238 
    239 		(void)strncpy(current_categories[category],
    240 		    new_categories[category],
    241 		    sizeof(current_categories[category]) - 1);
    242 		return current_categories[category];
    243 	}
    244 
    245 	/*
    246 	 * Some day we will actually look at this file.
    247 	 */
    248 	(void)snprintf(name, sizeof(name), "%s/%s/%s",
    249 	    PathLocale, new_categories[category], categories[category]);
    250 
    251 	switch (category) {
    252 	case LC_CTYPE:
    253 		if (__loadctype(name)) {
    254 			(void)strncpy(current_categories[category],
    255 			    new_categories[category],
    256 			    sizeof(current_categories[category]) - 1);
    257 			return current_categories[category];
    258 		}
    259 		return NULL;
    260 
    261 	case LC_COLLATE:
    262 	case LC_MESSAGES:
    263 	case LC_MONETARY:
    264 	case LC_NUMERIC:
    265 	case LC_TIME:
    266 		return NULL;
    267 	}
    268 
    269 	return NULL;
    270 }
    271