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setlocale.c revision 1.39 
      1 /*	$NetBSD: setlocale.c,v 1.39 2002/08/02 08:02:36 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 1.39 2002/08/02 08:02:36 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 <sys/types.h>
     53 #include <sys/stat.h>
     54 #include <assert.h>
     55 #include <limits.h>
     56 #include <ctype.h>
     57 #define __SETLOCALE_SOURCE__
     58 #include <locale.h>
     59 #include <paths.h>
     60 #include <stdio.h>
     61 #include <stdlib.h>
     62 #include <string.h>
     63 #include <unistd.h>
     64 #ifdef WITH_RUNE
     65 #include "rune.h"
     66 #include "rune_local.h"
     67 #else
     68 #include "ctypeio.h"
     69 #endif
     70 
     71 /*
     72  * Category names for getenv()
     73  */
     74 static const char *const categories[_LC_LAST] = {
     75     "LC_ALL",
     76     "LC_COLLATE",
     77     "LC_CTYPE",
     78     "LC_MONETARY",
     79     "LC_NUMERIC",
     80     "LC_TIME",
     81     "LC_MESSAGES"
     82 };
     83 
     84 /*
     85  * Current locales for each category
     86  */
     87 static char current_categories[_LC_LAST][32] = {
     88     "C",
     89     "C",
     90     "C",
     91     "C",
     92     "C",
     93     "C",
     94     "C"
     95 };
     96 
     97 /*
     98  * The locales we are going to try and load
     99  */
    100 static char new_categories[_LC_LAST][32];
    101 
    102 /*
    103  * Backup area to back out changes on failure
    104  */
    105 static char saved_categories[_LC_LAST][32];
    106 
    107 static char current_locale_string[_LC_LAST * 33];
    108 char *_PathLocale;
    109 
    110 static char *currentlocale __P((void));
    111 static char *loadlocale __P((int));
    112 static const char *__get_locale_env __P((int));
    113 
    114 char *
    115 __setlocale(category, locale)
    116 	int category;
    117 	const char *locale;
    118 {
    119 	int i, loadlocale_success;
    120 	size_t len;
    121 	const char *env, *r;
    122 
    123 	if (issetugid() ||
    124 	    (!_PathLocale && !(_PathLocale = getenv("PATH_LOCALE"))))
    125 		_PathLocale = _PATH_LOCALE;
    126 
    127 	if (category < 0 || category >= _LC_LAST)
    128 		return (NULL);
    129 
    130 	if (!locale)
    131 		return (category ?
    132 		    current_categories[category] : currentlocale());
    133 
    134 	/*
    135 	 * Default to the current locale for everything.
    136 	 */
    137 	for (i = 1; i < _LC_LAST; ++i)
    138 		(void)strlcpy(new_categories[i], current_categories[i],
    139 		    sizeof(new_categories[i]));
    140 
    141 	/*
    142 	 * Now go fill up new_categories from the locale argument
    143 	 */
    144 	if (!*locale) {
    145 		if (category == LC_ALL) {
    146 			for (i = 1; i < _LC_LAST; ++i) {
    147 				env = __get_locale_env(i);
    148 				(void)strlcpy(new_categories[i], env,
    149 				    sizeof(new_categories[i]));
    150 			}
    151 		}
    152 		else {
    153 			env = __get_locale_env(category);
    154 			(void)strlcpy(new_categories[category], env,
    155 				sizeof(new_categories[category]));
    156 		}
    157 	} else if (category) {
    158 		(void)strlcpy(new_categories[category], locale,
    159 		    sizeof(new_categories[category]));
    160 	} else {
    161 		if ((r = strchr(locale, '/')) == 0) {
    162 			for (i = 1; i < _LC_LAST; ++i) {
    163 				(void)strlcpy(new_categories[i], locale,
    164 				    sizeof(new_categories[i]));
    165 			}
    166 		} else {
    167 			for (i = 1; r[1] == '/'; ++r)
    168 				;
    169 			if (!r[1])
    170 				return (NULL);	/* Hmm, just slashes... */
    171 			do {
    172 				if (i == _LC_LAST)
    173 					return (NULL);	/* too many slashes. */
    174 				len = r - locale > sizeof(new_categories[i]) - 1
    175 					? sizeof(new_categories[i]) - 1
    176 					: r - locale;
    177 				if (len + 1 > sizeof(new_categories[i]))
    178 					return (NULL);	/* too long */
    179 				(void)memcpy(new_categories[i], locale, len);
    180 				new_categories[i][len] = '\0';
    181 				i++;
    182 				locale = r;
    183 				while (*locale == '/')
    184 					++locale;
    185 				while (*++r && *r != '/');
    186 			} while (*locale);
    187 			while (i < _LC_LAST) {
    188 				(void)strlcpy(new_categories[i],
    189 				    new_categories[i - 1],
    190 				    sizeof(new_categories[i]));
    191 				i++;
    192 			}
    193 		}
    194 	}
    195 
    196 	if (category)
    197 		return (loadlocale(category));
    198 
    199 	loadlocale_success = 0;
    200 	for (i = 1; i < _LC_LAST; ++i) {
    201 		(void)strlcpy(saved_categories[i], current_categories[i],
    202 		    sizeof(saved_categories[i]));
    203 		if (loadlocale(i) != NULL)
    204 			loadlocale_success = 1;
    205 	}
    206 
    207 	/*
    208 	 * If all categories failed, return NULL; we don't need to back
    209 	 * changes off, since none happened.
    210 	 */
    211 	if (!loadlocale_success)
    212 		return NULL;
    213 
    214 	return (currentlocale());
    215 }
    216 
    217 static char *
    218 currentlocale()
    219 {
    220 	int i;
    221 
    222 	(void)strlcpy(current_locale_string, current_categories[1],
    223 	    sizeof(current_locale_string));
    224 
    225 	for (i = 2; i < _LC_LAST; ++i)
    226 		if (strcmp(current_categories[1], current_categories[i])) {
    227 			(void)snprintf(current_locale_string,
    228 			    sizeof(current_locale_string), "%s/%s/%s/%s/%s/%s",
    229 			    current_categories[1], current_categories[2],
    230 			    current_categories[3], current_categories[4],
    231 			    current_categories[5], current_categories[6]);
    232 			break;
    233 		}
    234 	return (current_locale_string);
    235 }
    236 
    237 static char *
    238 loadlocale(category)
    239 	int category;
    240 {
    241 	char name[PATH_MAX];
    242 
    243 	_DIAGASSERT(0 < category && category < _LC_LAST);
    244 
    245 	if (strcmp(new_categories[category], current_categories[category]) == 0)
    246 		return (current_categories[category]);
    247 
    248 	if (!strcmp(new_categories[category], "C") ||
    249 	    !strcmp(new_categories[category], "POSIX")) {
    250 
    251 		switch (category) {
    252 		case LC_CTYPE:
    253 #ifdef WITH_RUNE
    254 			(void)_xpg4_setrunelocale("C");
    255 			(void)__runetable_to_netbsd_ctype("C");
    256 #else
    257 			if (_ctype_ != _C_ctype_) {
    258 				/* LINTED const castaway */
    259 				free((void *)_ctype_);
    260 				_ctype_ = _C_ctype_;
    261 			}
    262 			if (_toupper_tab_ != _C_toupper_) {
    263 				/* LINTED const castaway */
    264 				free((void *)_toupper_tab_);
    265 				_toupper_tab_ = _C_toupper_;
    266 			}
    267 			if (_tolower_tab_ != _C_tolower_) {
    268 				/* LINTED const castaway */
    269 				free((void *)_tolower_tab_);
    270 				_tolower_tab_ = _C_tolower_;
    271 			}
    272 #endif
    273 		}
    274 
    275 		(void)strlcpy(current_categories[category],
    276 		    new_categories[category],
    277 		    sizeof(current_categories[category]));
    278 		return current_categories[category];
    279 	}
    280 
    281 	(void)snprintf(name, sizeof(name), "%s/%s/%s",
    282 	    _PathLocale, new_categories[category], categories[category]);
    283 
    284 	switch (category) {
    285 	case LC_CTYPE:
    286 #ifdef WITH_RUNE
    287 		if (_xpg4_setrunelocale(new_categories[category]))
    288 			return NULL;
    289 		if (__runetable_to_netbsd_ctype(new_categories[category])) {
    290 			/* very unfortunate, but need to go to "C" locale */
    291 			(void)_xpg4_setrunelocale("C");
    292 			(void)__runetable_to_netbsd_ctype("C");
    293 			return NULL;
    294 		}
    295 #else
    296 		if (!__loadctype(name))
    297 			return NULL;
    298 #endif
    299 		break;
    300 
    301 	case LC_MESSAGES:
    302 		/*
    303 		 * XXX we don't have LC_MESSAGES support yet,
    304 		 * but catopen may use the value of LC_MESSAGES category.
    305 		 * so return successfully if locale directory is present.
    306 		 */
    307 		(void)snprintf(name, sizeof(name), "%s/%s",
    308 			_PathLocale, new_categories[category]);
    309 		/* local */
    310 		{
    311 			struct stat st;
    312 			if (stat(name, &st) < 0)
    313 				return NULL;
    314 			if (!S_ISDIR(st.st_mode))
    315 				return NULL;
    316 		}
    317 		break;
    318 
    319 	case LC_COLLATE:
    320 	case LC_MONETARY:
    321 	case LC_NUMERIC:
    322 	case LC_TIME:
    323 		return NULL;
    324 	}
    325 
    326 	(void)strlcpy(current_categories[category],
    327 		new_categories[category],
    328 		sizeof(current_categories[category]));
    329 	return current_categories[category];
    330 }
    331 
    332 static const char *
    333 __get_locale_env(category)
    334 	int category;
    335 {
    336 	const char *env;
    337 
    338 	_DIAGASSERT(category != LC_ALL);
    339 
    340 	/* 1. check LC_ALL. */
    341 	env = getenv(categories[0]);
    342 
    343 	/* 2. check LC_* */
    344 	if (!env || !*env)
    345 		env = getenv(categories[category]);
    346 
    347 	/* 3. check LANG */
    348 	if (!env || !*env)
    349 		env = getenv("LANG");
    350 
    351 	/* 4. if none is set, fall to "C" */
    352 	if (!env || !*env || strchr(env, '/'))
    353 		env = "C";
    354 
    355 	return env;
    356 }
    357