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setlocale.c revision 1.33 
      1 /*	$NetBSD: setlocale.c,v 1.33 2001/01/22 00:29:46 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 1.33 2001/01/22 00:29:46 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 #ifdef WITH_RUNE
     62 #include "rune.h"
     63 #include "rune_local.h"
     64 #else
     65 #include "ctypeio.h"
     66 #endif
     67 
     68 /*
     69  * Category names for getenv()
     70  */
     71 static const char *const categories[_LC_LAST] = {
     72     "LC_ALL",
     73     "LC_COLLATE",
     74     "LC_CTYPE",
     75     "LC_MONETARY",
     76     "LC_NUMERIC",
     77     "LC_TIME",
     78     "LC_MESSAGES"
     79 };
     80 
     81 /*
     82  * Current locales for each category
     83  */
     84 static char current_categories[_LC_LAST][32] = {
     85     "C",
     86     "C",
     87     "C",
     88     "C",
     89     "C",
     90     "C",
     91     "C"
     92 };
     93 
     94 size_t __mb_len_max_runtime = MB_LEN_MAX;
     95 
     96 /*
     97  * The locales we are going to try and load
     98  */
     99 static char new_categories[_LC_LAST][32];
    100 
    101 /*
    102  * Backup area to back out changes on failure
    103  */
    104 static char saved_categories[_LC_LAST][32];
    105 
    106 static char current_locale_string[_LC_LAST * 33];
    107 char *_PathLocale;
    108 
    109 static char	*currentlocale __P((void));
    110 static char	*loadlocale __P((int));
    111 
    112 char *
    113 __setlocale_mb_len_max_32(category, locale)
    114 	int category;
    115 	const char *locale;
    116 {
    117 #ifdef WITH_RUNE
    118 	__mb_len_max_runtime = 32;
    119 #else
    120 	__mb_len_max_runtime = 1;
    121 #endif
    122 	return __setlocale(category, locale);
    123 }
    124 
    125 char *
    126 __setlocale(category, locale)
    127 	int category;
    128 	const char *locale;
    129 {
    130 	int i, loadlocale_success;
    131 	size_t len;
    132 	char *env, *r;
    133 
    134 	if (issetugid() ||
    135 	    (!_PathLocale && !(_PathLocale = getenv("PATH_LOCALE"))))
    136 		_PathLocale = _PATH_LOCALE;
    137 
    138 	if (category < 0 || category >= _LC_LAST)
    139 		return (NULL);
    140 
    141 	if (!locale)
    142 		return (category ?
    143 		    current_categories[category] : currentlocale());
    144 
    145 	/*
    146 	 * Default to the current locale for everything.
    147 	 */
    148 	for (i = 1; i < _LC_LAST; ++i)
    149 		(void)strlcpy(new_categories[i], current_categories[i],
    150 		    sizeof(new_categories[i]));
    151 
    152 	/*
    153 	 * Now go fill up new_categories from the locale argument
    154 	 */
    155 	if (!*locale) {
    156 		env = getenv(categories[category]);
    157 
    158 		if (!env || !*env)
    159 			env = getenv(categories[0]);
    160 
    161 		if (!env || !*env)
    162 			env = getenv("LANG");
    163 
    164 		if (!env || !*env || strchr(env, '/'))
    165 			env = "C";
    166 
    167 		(void)strlcpy(new_categories[category], env,
    168 		    sizeof(new_categories[category]));
    169 		if (!category) {
    170 			for (i = 1; i < _LC_LAST; ++i) {
    171 				env = getenv(categories[i]);
    172 				if (!env || !*env || strchr(env, '/'))
    173 					env = new_categories[0];
    174 				(void)strlcpy(new_categories[i], env,
    175 				    sizeof(new_categories[i]));
    176 			}
    177 		}
    178 	} else if (category) {
    179 		(void)strlcpy(new_categories[category], locale,
    180 		    sizeof(new_categories[category]));
    181 	} else {
    182 		if ((r = strchr(locale, '/')) == 0) {
    183 			for (i = 1; i < _LC_LAST; ++i) {
    184 				(void)strlcpy(new_categories[i], locale,
    185 				    sizeof(new_categories[i]));
    186 			}
    187 		} else {
    188 			for (i = 1; r[1] == '/'; ++r)
    189 				;
    190 			if (!r[1])
    191 				return (NULL);	/* Hmm, just slashes... */
    192 			do {
    193 				len = r - locale > sizeof(new_categories[i]) - 1
    194 					? sizeof(new_categories[i]) - 1
    195 					: r - locale;
    196 				(void)strncpy(new_categories[i++], locale, len);
    197 				new_categories[i++][len] = 0;
    198 				locale = r;
    199 				while (*locale == '/')
    200 				    ++locale;
    201 				while (*++r && *r != '/');
    202 			} while (*locale);
    203 			while (i < _LC_LAST)
    204 				(void)strlcpy(new_categories[i],
    205 				    new_categories[i - 1],
    206 				    sizeof(new_categories[i]));
    207 		}
    208 	}
    209 
    210 	if (category)
    211 		return (loadlocale(category));
    212 
    213 	loadlocale_success = 0;
    214 	for (i = 1; i < _LC_LAST; ++i) {
    215 		(void)strlcpy(saved_categories[i], current_categories[i],
    216 		    sizeof(saved_categories[i]));
    217 		if (loadlocale(i) != NULL)
    218 			loadlocale_success = 1;
    219 	}
    220 
    221 	/*
    222 	 * If all categories failed, return NULL; we don't need to back
    223 	 * changes off, since none happened.
    224 	 */
    225 	if (!loadlocale_success)
    226 		return NULL;
    227 
    228 	return (currentlocale());
    229 }
    230 
    231 static char *
    232 currentlocale()
    233 {
    234 	int i;
    235 
    236 	(void)strlcpy(current_locale_string, current_categories[1],
    237 	    sizeof(current_locale_string));
    238 
    239 	for (i = 2; i < _LC_LAST; ++i)
    240 		if (strcmp(current_categories[1], current_categories[i])) {
    241 			(void)snprintf(current_locale_string,
    242 			    sizeof(current_locale_string), "%s/%s/%s/%s/%s",
    243 			    current_categories[1], current_categories[2],
    244 			    current_categories[3], current_categories[4],
    245 			    current_categories[5]);
    246 			break;
    247 		}
    248 	return (current_locale_string);
    249 }
    250 
    251 static char *
    252 loadlocale(category)
    253 	int category;
    254 {
    255 	char name[PATH_MAX];
    256 
    257 	if (strcmp(new_categories[category], current_categories[category]) == 0)
    258 		return (current_categories[category]);
    259 
    260 	if (!strcmp(new_categories[category], "C") ||
    261 	    !strcmp(new_categories[category], "POSIX")) {
    262 
    263 		switch (category) {
    264 		case LC_CTYPE:
    265 #ifdef WITH_RUNE
    266 			(void)_xpg4_setrunelocale("C");
    267 			(void)__runetable_to_netbsd_ctype("C");
    268 #else
    269 			if (_ctype_ != _C_ctype_) {
    270 				/* LINTED const castaway */
    271 				free((void *)_ctype_);
    272 				_ctype_ = _C_ctype_;
    273 			}
    274 			if (_toupper_tab_ != _C_toupper_) {
    275 				/* LINTED const castaway */
    276 				free((void *)_toupper_tab_);
    277 				_toupper_tab_ = _C_toupper_;
    278 			}
    279 			if (_tolower_tab_ != _C_tolower_) {
    280 				/* LINTED const castaway */
    281 				free((void *)_tolower_tab_);
    282 				_tolower_tab_ = _C_tolower_;
    283 			}
    284 #endif
    285 		}
    286 
    287 		(void)strlcpy(current_categories[category],
    288 		    new_categories[category],
    289 		    sizeof(current_categories[category]));
    290 		return current_categories[category];
    291 	}
    292 
    293 	/*
    294 	 * Some day we will actually look at this file.
    295 	 */
    296 	(void)snprintf(name, sizeof(name), "%s/%s/%s",
    297 	    _PathLocale, new_categories[category], categories[category]);
    298 
    299 	switch (category) {
    300 	case LC_CTYPE:
    301 #ifdef WITH_RUNE
    302 		if (_xpg4_setrunelocale(new_categories[category]))
    303 			return NULL;
    304 		if (__runetable_to_netbsd_ctype(new_categories[category])) {
    305 			/* very unfortunate, but need to go to "C" locale */
    306 			(void)_xpg4_setrunelocale("C");
    307 			(void)__runetable_to_netbsd_ctype("C");
    308 			return NULL;
    309 		}
    310 #else
    311 		if (!__loadctype(name))
    312 			return NULL;
    313 #endif
    314 
    315 		(void)strlcpy(current_categories[category],
    316 		    new_categories[category],
    317 		    sizeof(current_categories[category]));
    318 		return current_categories[category];
    319 
    320 	case LC_COLLATE:
    321 	case LC_MESSAGES:
    322 	case LC_MONETARY:
    323 	case LC_NUMERIC:
    324 	case LC_TIME:
    325 		return NULL;
    326 	}
    327 
    328 	return NULL;
    329 }
    330