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setlocale.c revision 1.24 
      1 /*	$NetBSD: setlocale.c,v 1.24 2000/12/21 11:29:47 itojun 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 1.24 2000/12/21 11:29:47 itojun 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 #define __SETLOCALE_SOURCE__
     55 #include <locale.h>
     56 #include <paths.h>
     57 #include <stdio.h>
     58 #include <stdlib.h>
     59 #include <string.h>
     60 #include <unistd.h>
     61 #include "rune.h"
     62 #include "rune_local.h"
     63 
     64 /*
     65  * Category names for getenv()
     66  */
     67 static const char *const categories[_LC_LAST] = {
     68     "LC_ALL",
     69     "LC_COLLATE",
     70     "LC_CTYPE",
     71     "LC_MONETARY",
     72     "LC_NUMERIC",
     73     "LC_TIME",
     74     "LC_MESSAGES"
     75 };
     76 
     77 /*
     78  * Current locales for each category
     79  */
     80 static char current_categories[_LC_LAST][32] = {
     81     "C",
     82     "C",
     83     "C",
     84     "C",
     85     "C",
     86     "C",
     87     "C"
     88 };
     89 
     90 size_t __mb_cur_max = 1;
     91 size_t __mb_len_max_runtime = MB_LEN_MAX;
     92 
     93 /*
     94  * The locales we are going to try and load
     95  */
     96 static char new_categories[_LC_LAST][32];
     97 
     98 /*
     99  * Backup area to back out changes on failure
    100  */
    101 static char saved_categories[_LC_LAST][32];
    102 
    103 static char current_locale_string[_LC_LAST * 33];
    104 char *_PathLocale;
    105 
    106 static char	*currentlocale __P((void));
    107 static char	*loadlocale __P((int));
    108 
    109 char *
    110 __setlocale_mb_len_max_32(category, locale)
    111 	int category;
    112 	const char *locale;
    113 {
    114 	__mb_len_max_runtime = 32;
    115 	return __setlocale(category, locale);
    116 }
    117 
    118 char *
    119 __setlocale(category, locale)
    120 	int category;
    121 	const char *locale;
    122 {
    123 	int i, j;
    124 	size_t len;
    125 	char *env, *r;
    126 
    127 	if (issetugid() ||
    128 	    (!_PathLocale && !(_PathLocale = getenv("PATH_LOCALE"))))
    129 		_PathLocale = _PATH_LOCALE;
    130 
    131 	if (category < 0 || category >= _LC_LAST)
    132 		return (NULL);
    133 
    134 	if (!locale)
    135 		return (category ?
    136 		    current_categories[category] : currentlocale());
    137 
    138 	/*
    139 	 * Default to the current locale for everything.
    140 	 */
    141 	for (i = 1; i < _LC_LAST; ++i)
    142 		(void)strlcpy(new_categories[i], current_categories[i],
    143 		    sizeof(new_categories[i]));
    144 
    145 	/*
    146 	 * Now go fill up new_categories from the locale argument
    147 	 */
    148 	if (!*locale) {
    149 		env = getenv(categories[category]);
    150 
    151 		if (!env || !*env)
    152 			env = getenv(categories[0]);
    153 
    154 		if (!env || !*env)
    155 			env = getenv("LANG");
    156 
    157 		if (!env || !*env || strchr(env, '/'))
    158 			env = "C";
    159 
    160 		(void)strlcpy(new_categories[category], env,
    161 		    sizeof(new_categories[category]));
    162 		if (!category) {
    163 			for (i = 1; i < _LC_LAST; ++i) {
    164 				if (!(env = getenv(categories[i])) || !*env)
    165 					env = new_categories[0];
    166 				(void)strlcpy(new_categories[i], env,
    167 				    sizeof(new_categories[i]));
    168 			}
    169 		}
    170 	} else if (category) {
    171 		(void)strlcpy(new_categories[category], locale,
    172 		    sizeof(new_categories[category]));
    173 	} else {
    174 		if ((r = strchr(locale, '/')) == 0) {
    175 			for (i = 1; i < _LC_LAST; ++i) {
    176 				(void)strlcpy(new_categories[i], locale,
    177 				    sizeof(new_categories[i]));
    178 			}
    179 		} else {
    180 			for (i = 1; r[1] == '/'; ++r)
    181 				;
    182 			if (!r[1])
    183 				return (NULL);	/* Hmm, just slashes... */
    184 			do {
    185 				len = r - locale > sizeof(new_categories[i]) - 1
    186 					? sizeof(new_categories[i]) - 1
    187 					: r - locale;
    188 				(void)strncpy(new_categories[i++], locale, len);
    189 				new_categories[i++][len] = 0;
    190 				locale = r;
    191 				while (*locale == '/')
    192 				    ++locale;
    193 				while (*++r && *r != '/');
    194 			} while (*locale);
    195 			while (i < _LC_LAST)
    196 				(void)strlcpy(new_categories[i],
    197 				    new_categories[i - 1],
    198 				    sizeof(new_categories[i]));
    199 		}
    200 	}
    201 
    202 	if (category)
    203 		return (loadlocale(category));
    204 
    205 	for (i = 1; i < _LC_LAST; ++i) {
    206 		(void)strlcpy(saved_categories[i], current_categories[i],
    207 		    sizeof(saved_categories[i]));
    208 		if (loadlocale(i) == NULL) {
    209 			for (j = 1; j < i; j++) {
    210 				(void)strlcpy(new_categories[j],
    211 				     saved_categories[j],
    212 				     sizeof(new_categories[j]));
    213 				/* XXX can fail too */
    214 				(void)loadlocale(j);
    215 			}
    216 			return (NULL);
    217 		}
    218 	}
    219 	return (currentlocale());
    220 }
    221 
    222 static char *
    223 currentlocale()
    224 {
    225 	int i;
    226 
    227 	(void)strlcpy(current_locale_string, current_categories[1],
    228 	    sizeof(current_locale_string));
    229 
    230 	for (i = 2; i < _LC_LAST; ++i)
    231 		if (strcmp(current_categories[1], current_categories[i])) {
    232 			(void)snprintf(current_locale_string,
    233 			    sizeof(current_locale_string), "%s/%s/%s/%s/%s",
    234 			    current_categories[1], current_categories[2],
    235 			    current_categories[3], current_categories[4],
    236 			    current_categories[5]);
    237 			break;
    238 		}
    239 	return (current_locale_string);
    240 }
    241 
    242 static char *
    243 loadlocale(category)
    244 	int category;
    245 {
    246 	char name[PATH_MAX];
    247 
    248 	if (strcmp(new_categories[category], current_categories[category]) == 0)
    249 		return (current_categories[category]);
    250 
    251 	if (!strcmp(new_categories[category], "C") ||
    252 	    !strcmp(new_categories[category], "POSIX")) {
    253 
    254 		switch (category) {
    255 		case LC_CTYPE:
    256 			if (_ctype_ != _C_ctype_) {
    257 				/* LINTED const castaway */
    258 				free((void *)_ctype_);
    259 				_ctype_ = _C_ctype_;
    260 			}
    261 			if (_toupper_tab_ != _C_toupper_) {
    262 				/* LINTED const castaway */
    263 				free((void *)_toupper_tab_);
    264 				_toupper_tab_ = _C_toupper_;
    265 			}
    266 			if (_tolower_tab_ != _C_tolower_) {
    267 				/* LINTED const castaway */
    268 				free((void *)_tolower_tab_);
    269 				_tolower_tab_ = _C_tolower_;
    270 			}
    271 			(void)_xpg4_setrunelocale("C");
    272 		}
    273 
    274 		(void)strlcpy(current_categories[category],
    275 		    new_categories[category],
    276 		    sizeof(current_categories[category]));
    277 		return current_categories[category];
    278 	}
    279 
    280 	/*
    281 	 * Some day we will actually look at this file.
    282 	 */
    283 	(void)snprintf(name, sizeof(name), "%s/%s/%s",
    284 	    _PathLocale, new_categories[category], categories[category]);
    285 
    286 	switch (category) {
    287 	case LC_CTYPE:
    288 		if (!_xpg4_setrunelocale(new_categories[category]) &&
    289 		    !__runetable_to_netbsd_ctype()) {
    290 			(void)strlcpy(current_categories[category],
    291 			    new_categories[category],
    292 			    sizeof(current_categories[category]));
    293 			return current_categories[category];
    294 		} else
    295 			return __setlocale(LC_CTYPE, "C");
    296 		return NULL;
    297 
    298 	case LC_COLLATE:
    299 	case LC_MESSAGES:
    300 	case LC_MONETARY:
    301 	case LC_NUMERIC:
    302 	case LC_TIME:
    303 		return NULL;
    304 	}
    305 
    306 	return NULL;
    307 }
    308