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setlocale.c revision 1.43 
      1 /*	$NetBSD: setlocale.c,v 1.43 2003/08/07 16:43:06 agc 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. Neither the name of the University nor the names of its contributors
     19  *    may be used to endorse or promote products derived from this software
     20  *    without specific prior written permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     32  * SUCH DAMAGE.
     33  */
     34 
     35 #include <sys/cdefs.h>
     36 #if defined(LIBC_SCCS) && !defined(lint)
     37 #if 0
     38 static char sccsid[] = "@(#)setlocale.c	8.1 (Berkeley) 7/4/93";
     39 #else
     40 __RCSID("$NetBSD: setlocale.c,v 1.43 2003/08/07 16:43:06 agc Exp $");
     41 #endif
     42 #endif /* LIBC_SCCS and not lint */
     43 
     44 #define _CTYPE_PRIVATE
     45 
     46 #include "namespace.h"
     47 #include <sys/localedef.h>
     48 #include <sys/types.h>
     49 #include <sys/stat.h>
     50 #include <assert.h>
     51 #include <limits.h>
     52 #include <ctype.h>
     53 #define __SETLOCALE_SOURCE__
     54 #include <locale.h>
     55 #include <paths.h>
     56 #include <stdio.h>
     57 #include <stdlib.h>
     58 #include <string.h>
     59 #include <unistd.h>
     60 #ifdef WITH_RUNE
     61 #include "rune.h"
     62 #include "rune_local.h"
     63 #else
     64 #include "ctypeio.h"
     65 #endif
     66 
     67 /*
     68  * Category names for getenv()
     69  */
     70 static const char *const categories[_LC_LAST] = {
     71     "LC_ALL",
     72     "LC_COLLATE",
     73     "LC_CTYPE",
     74     "LC_MONETARY",
     75     "LC_NUMERIC",
     76     "LC_TIME",
     77     "LC_MESSAGES"
     78 };
     79 
     80 /*
     81  * Current locales for each category
     82  */
     83 static char current_categories[_LC_LAST][32] = {
     84     "C",
     85     "C",
     86     "C",
     87     "C",
     88     "C",
     89     "C",
     90     "C"
     91 };
     92 
     93 /*
     94  * The locales we are going to try and load
     95  */
     96 static char new_categories[_LC_LAST][32];
     97 
     98 static char current_locale_string[_LC_LAST * 33];
     99 char *_PathLocale;
    100 
    101 static char *currentlocale __P((void));
    102 static char *loadlocale __P((int));
    103 static const char *__get_locale_env __P((int));
    104 
    105 char *
    106 __setlocale(category, locale)
    107 	int category;
    108 	const char *locale;
    109 {
    110 	int i, loadlocale_success;
    111 	size_t len;
    112 	const char *env, *r;
    113 
    114 	if (issetugid() ||
    115 	    (!_PathLocale && !(_PathLocale = getenv("PATH_LOCALE"))))
    116 		_PathLocale = _PATH_LOCALE;
    117 
    118 	if (category < 0 || category >= _LC_LAST)
    119 		return (NULL);
    120 
    121 	if (!locale)
    122 		return (category ?
    123 		    current_categories[category] : currentlocale());
    124 
    125 	/*
    126 	 * Default to the current locale for everything.
    127 	 */
    128 	for (i = 1; i < _LC_LAST; ++i)
    129 		(void)strlcpy(new_categories[i], current_categories[i],
    130 		    sizeof(new_categories[i]));
    131 
    132 	/*
    133 	 * Now go fill up new_categories from the locale argument
    134 	 */
    135 	if (!*locale) {
    136 		if (category == LC_ALL) {
    137 			for (i = 1; i < _LC_LAST; ++i) {
    138 				env = __get_locale_env(i);
    139 				(void)strlcpy(new_categories[i], env,
    140 				    sizeof(new_categories[i]));
    141 			}
    142 		}
    143 		else {
    144 			env = __get_locale_env(category);
    145 			(void)strlcpy(new_categories[category], env,
    146 				sizeof(new_categories[category]));
    147 		}
    148 	} else if (category) {
    149 		(void)strlcpy(new_categories[category], locale,
    150 		    sizeof(new_categories[category]));
    151 	} else {
    152 		if ((r = strchr(locale, '/')) == 0) {
    153 			for (i = 1; i < _LC_LAST; ++i) {
    154 				(void)strlcpy(new_categories[i], locale,
    155 				    sizeof(new_categories[i]));
    156 			}
    157 		} else {
    158 			for (i = 1;;) {
    159 				_DIAGASSERT(*r == '/' || *r == 0);
    160 				_DIAGASSERT(*locale != 0);
    161 				if (*locale == '/')
    162 					return (NULL);	/* invalid format. */
    163 				len = r - locale;
    164 				if (len + 1 > sizeof(new_categories[i]))
    165 					return (NULL);	/* too long */
    166 				(void)memcpy(new_categories[i], locale, len);
    167 				new_categories[i][len] = '\0';
    168 				if (*r == 0)
    169 					break;
    170 				_DIAGASSERT(*r == '/');
    171 				if (*(locale = ++r) == 0)
    172 					/* slash followed by NUL */
    173 					return (NULL);
    174 				/* skip until NUL or '/' */
    175 				while (*r && *r != '/')
    176 					r++;
    177 				if (++i == _LC_LAST)
    178 					return (NULL);	/* too many slashes. */
    179 			}
    180 			if (i + 1 != _LC_LAST)
    181 				return (NULL);	/* too few slashes. */
    182 		}
    183 	}
    184 
    185 	if (category)
    186 		return (loadlocale(category));
    187 
    188 	loadlocale_success = 0;
    189 	for (i = 1; i < _LC_LAST; ++i) {
    190 		if (loadlocale(i) != NULL)
    191 			loadlocale_success = 1;
    192 	}
    193 
    194 	/*
    195 	 * If all categories failed, return NULL; we don't need to back
    196 	 * changes off, since none happened.
    197 	 */
    198 	if (!loadlocale_success)
    199 		return NULL;
    200 
    201 	return (currentlocale());
    202 }
    203 
    204 static char *
    205 currentlocale()
    206 {
    207 	int i;
    208 
    209 	(void)strlcpy(current_locale_string, current_categories[1],
    210 	    sizeof(current_locale_string));
    211 
    212 	for (i = 2; i < _LC_LAST; ++i)
    213 		if (strcmp(current_categories[1], current_categories[i])) {
    214 			(void)snprintf(current_locale_string,
    215 			    sizeof(current_locale_string), "%s/%s/%s/%s/%s/%s",
    216 			    current_categories[1], current_categories[2],
    217 			    current_categories[3], current_categories[4],
    218 			    current_categories[5], current_categories[6]);
    219 			break;
    220 		}
    221 	return (current_locale_string);
    222 }
    223 
    224 static char *
    225 loadlocale(category)
    226 	int category;
    227 {
    228 	char name[PATH_MAX];
    229 
    230 	_DIAGASSERT(0 < category && category < _LC_LAST);
    231 
    232 	if (strcmp(new_categories[category], current_categories[category]) == 0)
    233 		return (current_categories[category]);
    234 
    235 	if (!strcmp(new_categories[category], "C") ||
    236 	    !strcmp(new_categories[category], "POSIX")) {
    237 
    238 		switch (category) {
    239 		case LC_CTYPE:
    240 #ifdef WITH_RUNE
    241 			(void)_xpg4_setrunelocale("C");
    242 			(void)__runetable_to_netbsd_ctype("C");
    243 #else
    244 			if (_ctype_ != _C_ctype_) {
    245 				/* LINTED const castaway */
    246 				free((void *)_ctype_);
    247 				_ctype_ = _C_ctype_;
    248 			}
    249 			if (_toupper_tab_ != _C_toupper_) {
    250 				/* LINTED const castaway */
    251 				free((void *)_toupper_tab_);
    252 				_toupper_tab_ = _C_toupper_;
    253 			}
    254 			if (_tolower_tab_ != _C_tolower_) {
    255 				/* LINTED const castaway */
    256 				free((void *)_tolower_tab_);
    257 				_tolower_tab_ = _C_tolower_;
    258 			}
    259 #endif
    260 		}
    261 
    262 		(void)strlcpy(current_categories[category],
    263 		    new_categories[category],
    264 		    sizeof(current_categories[category]));
    265 		return current_categories[category];
    266 	}
    267 
    268 	(void)snprintf(name, sizeof(name), "%s/%s/%s",
    269 	    _PathLocale, new_categories[category], categories[category]);
    270 
    271 	switch (category) {
    272 	case LC_CTYPE:
    273 #ifdef WITH_RUNE
    274 		if (_xpg4_setrunelocale(new_categories[category]))
    275 			return NULL;
    276 		if (__runetable_to_netbsd_ctype(new_categories[category])) {
    277 			/* very unfortunate, but need to go to "C" locale */
    278 			(void)_xpg4_setrunelocale("C");
    279 			(void)__runetable_to_netbsd_ctype("C");
    280 			return NULL;
    281 		}
    282 #else
    283 		if (!__loadctype(name))
    284 			return NULL;
    285 #endif
    286 		break;
    287 
    288 	case LC_MESSAGES:
    289 		/*
    290 		 * XXX we don't have LC_MESSAGES support yet,
    291 		 * but catopen may use the value of LC_MESSAGES category.
    292 		 * so return successfully if locale directory is present.
    293 		 */
    294 		(void)snprintf(name, sizeof(name), "%s/%s",
    295 			_PathLocale, new_categories[category]);
    296 		/* local */
    297 		{
    298 			struct stat st;
    299 			if (stat(name, &st) < 0)
    300 				return NULL;
    301 			if (!S_ISDIR(st.st_mode))
    302 				return NULL;
    303 		}
    304 		break;
    305 
    306 	case LC_COLLATE:
    307 	case LC_MONETARY:
    308 	case LC_NUMERIC:
    309 	case LC_TIME:
    310 		return NULL;
    311 	}
    312 
    313 	(void)strlcpy(current_categories[category],
    314 		new_categories[category],
    315 		sizeof(current_categories[category]));
    316 	return current_categories[category];
    317 }
    318 
    319 static const char *
    320 __get_locale_env(category)
    321 	int category;
    322 {
    323 	const char *env;
    324 
    325 	_DIAGASSERT(category != LC_ALL);
    326 
    327 	/* 1. check LC_ALL. */
    328 	env = getenv(categories[0]);
    329 
    330 	/* 2. check LC_* */
    331 	if (!env || !*env)
    332 		env = getenv(categories[category]);
    333 
    334 	/* 3. check LANG */
    335 	if (!env || !*env)
    336 		env = getenv("LANG");
    337 
    338 	/* 4. if none is set, fall to "C" */
    339 	if (!env || !*env || strchr(env, '/'))
    340 		env = "C";
    341 
    342 	return env;
    343 }
    344