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setlocale.c revision 1.42 
      1 /*	$NetBSD: setlocale.c,v 1.42 2002/08/07 04:42:42 enami 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 1.42 2002/08/07 04:42:42 enami 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 static char current_locale_string[_LC_LAST * 33];
    103 char *_PathLocale;
    104 
    105 static char *currentlocale __P((void));
    106 static char *loadlocale __P((int));
    107 static const char *__get_locale_env __P((int));
    108 
    109 char *
    110 __setlocale(category, locale)
    111 	int category;
    112 	const char *locale;
    113 {
    114 	int i, loadlocale_success;
    115 	size_t len;
    116 	const char *env, *r;
    117 
    118 	if (issetugid() ||
    119 	    (!_PathLocale && !(_PathLocale = getenv("PATH_LOCALE"))))
    120 		_PathLocale = _PATH_LOCALE;
    121 
    122 	if (category < 0 || category >= _LC_LAST)
    123 		return (NULL);
    124 
    125 	if (!locale)
    126 		return (category ?
    127 		    current_categories[category] : currentlocale());
    128 
    129 	/*
    130 	 * Default to the current locale for everything.
    131 	 */
    132 	for (i = 1; i < _LC_LAST; ++i)
    133 		(void)strlcpy(new_categories[i], current_categories[i],
    134 		    sizeof(new_categories[i]));
    135 
    136 	/*
    137 	 * Now go fill up new_categories from the locale argument
    138 	 */
    139 	if (!*locale) {
    140 		if (category == LC_ALL) {
    141 			for (i = 1; i < _LC_LAST; ++i) {
    142 				env = __get_locale_env(i);
    143 				(void)strlcpy(new_categories[i], env,
    144 				    sizeof(new_categories[i]));
    145 			}
    146 		}
    147 		else {
    148 			env = __get_locale_env(category);
    149 			(void)strlcpy(new_categories[category], env,
    150 				sizeof(new_categories[category]));
    151 		}
    152 	} else if (category) {
    153 		(void)strlcpy(new_categories[category], locale,
    154 		    sizeof(new_categories[category]));
    155 	} else {
    156 		if ((r = strchr(locale, '/')) == 0) {
    157 			for (i = 1; i < _LC_LAST; ++i) {
    158 				(void)strlcpy(new_categories[i], locale,
    159 				    sizeof(new_categories[i]));
    160 			}
    161 		} else {
    162 			for (i = 1;;) {
    163 				_DIAGASSERT(*r == '/' || *r == 0);
    164 				_DIAGASSERT(*locale != 0);
    165 				if (*locale == '/')
    166 					return (NULL);	/* invalid format. */
    167 				len = r - locale;
    168 				if (len + 1 > sizeof(new_categories[i]))
    169 					return (NULL);	/* too long */
    170 				(void)memcpy(new_categories[i], locale, len);
    171 				new_categories[i][len] = '\0';
    172 				if (*r == 0)
    173 					break;
    174 				_DIAGASSERT(*r == '/');
    175 				if (*(locale = ++r) == 0)
    176 					/* slash followed by NUL */
    177 					return (NULL);
    178 				/* skip until NUL or '/' */
    179 				while (*r && *r != '/')
    180 					r++;
    181 				if (++i == _LC_LAST)
    182 					return (NULL);	/* too many slashes. */
    183 			}
    184 			if (i + 1 != _LC_LAST)
    185 				return (NULL);	/* too few slashes. */
    186 		}
    187 	}
    188 
    189 	if (category)
    190 		return (loadlocale(category));
    191 
    192 	loadlocale_success = 0;
    193 	for (i = 1; i < _LC_LAST; ++i) {
    194 		if (loadlocale(i) != NULL)
    195 			loadlocale_success = 1;
    196 	}
    197 
    198 	/*
    199 	 * If all categories failed, return NULL; we don't need to back
    200 	 * changes off, since none happened.
    201 	 */
    202 	if (!loadlocale_success)
    203 		return NULL;
    204 
    205 	return (currentlocale());
    206 }
    207 
    208 static char *
    209 currentlocale()
    210 {
    211 	int i;
    212 
    213 	(void)strlcpy(current_locale_string, current_categories[1],
    214 	    sizeof(current_locale_string));
    215 
    216 	for (i = 2; i < _LC_LAST; ++i)
    217 		if (strcmp(current_categories[1], current_categories[i])) {
    218 			(void)snprintf(current_locale_string,
    219 			    sizeof(current_locale_string), "%s/%s/%s/%s/%s/%s",
    220 			    current_categories[1], current_categories[2],
    221 			    current_categories[3], current_categories[4],
    222 			    current_categories[5], current_categories[6]);
    223 			break;
    224 		}
    225 	return (current_locale_string);
    226 }
    227 
    228 static char *
    229 loadlocale(category)
    230 	int category;
    231 {
    232 	char name[PATH_MAX];
    233 
    234 	_DIAGASSERT(0 < category && category < _LC_LAST);
    235 
    236 	if (strcmp(new_categories[category], current_categories[category]) == 0)
    237 		return (current_categories[category]);
    238 
    239 	if (!strcmp(new_categories[category], "C") ||
    240 	    !strcmp(new_categories[category], "POSIX")) {
    241 
    242 		switch (category) {
    243 		case LC_CTYPE:
    244 #ifdef WITH_RUNE
    245 			(void)_xpg4_setrunelocale("C");
    246 			(void)__runetable_to_netbsd_ctype("C");
    247 #else
    248 			if (_ctype_ != _C_ctype_) {
    249 				/* LINTED const castaway */
    250 				free((void *)_ctype_);
    251 				_ctype_ = _C_ctype_;
    252 			}
    253 			if (_toupper_tab_ != _C_toupper_) {
    254 				/* LINTED const castaway */
    255 				free((void *)_toupper_tab_);
    256 				_toupper_tab_ = _C_toupper_;
    257 			}
    258 			if (_tolower_tab_ != _C_tolower_) {
    259 				/* LINTED const castaway */
    260 				free((void *)_tolower_tab_);
    261 				_tolower_tab_ = _C_tolower_;
    262 			}
    263 #endif
    264 		}
    265 
    266 		(void)strlcpy(current_categories[category],
    267 		    new_categories[category],
    268 		    sizeof(current_categories[category]));
    269 		return current_categories[category];
    270 	}
    271 
    272 	(void)snprintf(name, sizeof(name), "%s/%s/%s",
    273 	    _PathLocale, new_categories[category], categories[category]);
    274 
    275 	switch (category) {
    276 	case LC_CTYPE:
    277 #ifdef WITH_RUNE
    278 		if (_xpg4_setrunelocale(new_categories[category]))
    279 			return NULL;
    280 		if (__runetable_to_netbsd_ctype(new_categories[category])) {
    281 			/* very unfortunate, but need to go to "C" locale */
    282 			(void)_xpg4_setrunelocale("C");
    283 			(void)__runetable_to_netbsd_ctype("C");
    284 			return NULL;
    285 		}
    286 #else
    287 		if (!__loadctype(name))
    288 			return NULL;
    289 #endif
    290 		break;
    291 
    292 	case LC_MESSAGES:
    293 		/*
    294 		 * XXX we don't have LC_MESSAGES support yet,
    295 		 * but catopen may use the value of LC_MESSAGES category.
    296 		 * so return successfully if locale directory is present.
    297 		 */
    298 		(void)snprintf(name, sizeof(name), "%s/%s",
    299 			_PathLocale, new_categories[category]);
    300 		/* local */
    301 		{
    302 			struct stat st;
    303 			if (stat(name, &st) < 0)
    304 				return NULL;
    305 			if (!S_ISDIR(st.st_mode))
    306 				return NULL;
    307 		}
    308 		break;
    309 
    310 	case LC_COLLATE:
    311 	case LC_MONETARY:
    312 	case LC_NUMERIC:
    313 	case LC_TIME:
    314 		return NULL;
    315 	}
    316 
    317 	(void)strlcpy(current_categories[category],
    318 		new_categories[category],
    319 		sizeof(current_categories[category]));
    320 	return current_categories[category];
    321 }
    322 
    323 static const char *
    324 __get_locale_env(category)
    325 	int category;
    326 {
    327 	const char *env;
    328 
    329 	_DIAGASSERT(category != LC_ALL);
    330 
    331 	/* 1. check LC_ALL. */
    332 	env = getenv(categories[0]);
    333 
    334 	/* 2. check LC_* */
    335 	if (!env || !*env)
    336 		env = getenv(categories[category]);
    337 
    338 	/* 3. check LANG */
    339 	if (!env || !*env)
    340 		env = getenv("LANG");
    341 
    342 	/* 4. if none is set, fall to "C" */
    343 	if (!env || !*env || strchr(env, '/'))
    344 		env = "C";
    345 
    346 	return env;
    347 }
    348