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setlocale.c revision 1.45 
      1 /*	$NetBSD: setlocale.c,v 1.45 2004/07/21 17:49:49 tshiozak 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 1.45 2004/07/21 17:49:49 tshiozak 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 #include <citrus/citrus_namespace.h>
     68 #include <citrus/citrus_region.h>
     69 #include <citrus/citrus_lookup.h>
     70 
     71 #define _LOCALE_ALIAS_NAME	"locale.alias"
     72 
     73 /*
     74  * Category names for getenv()
     75  */
     76 static const char *const categories[_LC_LAST] = {
     77     "LC_ALL",
     78     "LC_COLLATE",
     79     "LC_CTYPE",
     80     "LC_MONETARY",
     81     "LC_NUMERIC",
     82     "LC_TIME",
     83     "LC_MESSAGES"
     84 };
     85 
     86 /*
     87  * Current locales for each category
     88  */
     89 static char current_categories[_LC_LAST][32] = {
     90     "C",
     91     "C",
     92     "C",
     93     "C",
     94     "C",
     95     "C",
     96     "C"
     97 };
     98 
     99 /*
    100  * The locales we are going to try and load
    101  */
    102 static char new_categories[_LC_LAST][32];
    103 
    104 static char current_locale_string[_LC_LAST * 33];
    105 char *_PathLocale;
    106 
    107 static char *currentlocale __P((void));
    108 static int load_locale_sub __P((int, const char *));
    109 static char *loadlocale __P((int));
    110 static const char *__get_locale_env __P((int));
    111 
    112 char *
    113 __setlocale(category, locale)
    114 	int category;
    115 	const char *locale;
    116 {
    117 	int i, loadlocale_success;
    118 	size_t len;
    119 	const char *env, *r;
    120 
    121 	if (issetugid() ||
    122 	    (!_PathLocale && !(_PathLocale = getenv("PATH_LOCALE"))))
    123 		_PathLocale = _PATH_LOCALE;
    124 
    125 	if (category < 0 || category >= _LC_LAST)
    126 		return (NULL);
    127 
    128 	if (!locale)
    129 		return (category ?
    130 		    current_categories[category] : currentlocale());
    131 
    132 	/*
    133 	 * Default to the current locale for everything.
    134 	 */
    135 	for (i = 1; i < _LC_LAST; ++i)
    136 		(void)strlcpy(new_categories[i], current_categories[i],
    137 		    sizeof(new_categories[i]));
    138 
    139 	/*
    140 	 * Now go fill up new_categories from the locale argument
    141 	 */
    142 	if (!*locale) {
    143 		if (category == LC_ALL) {
    144 			for (i = 1; i < _LC_LAST; ++i) {
    145 				env = __get_locale_env(i);
    146 				(void)strlcpy(new_categories[i], env,
    147 				    sizeof(new_categories[i]));
    148 			}
    149 		}
    150 		else {
    151 			env = __get_locale_env(category);
    152 			(void)strlcpy(new_categories[category], env,
    153 				sizeof(new_categories[category]));
    154 		}
    155 	} else if (category) {
    156 		(void)strlcpy(new_categories[category], locale,
    157 		    sizeof(new_categories[category]));
    158 	} else {
    159 		if ((r = strchr(locale, '/')) == 0) {
    160 			for (i = 1; i < _LC_LAST; ++i) {
    161 				(void)strlcpy(new_categories[i], locale,
    162 				    sizeof(new_categories[i]));
    163 			}
    164 		} else {
    165 			for (i = 1;;) {
    166 				_DIAGASSERT(*r == '/' || *r == 0);
    167 				_DIAGASSERT(*locale != 0);
    168 				if (*locale == '/')
    169 					return (NULL);	/* invalid format. */
    170 				len = r - locale;
    171 				if (len + 1 > sizeof(new_categories[i]))
    172 					return (NULL);	/* too long */
    173 				(void)memcpy(new_categories[i], locale, len);
    174 				new_categories[i][len] = '\0';
    175 				if (*r == 0)
    176 					break;
    177 				_DIAGASSERT(*r == '/');
    178 				if (*(locale = ++r) == 0)
    179 					/* slash followed by NUL */
    180 					return (NULL);
    181 				/* skip until NUL or '/' */
    182 				while (*r && *r != '/')
    183 					r++;
    184 				if (++i == _LC_LAST)
    185 					return (NULL);	/* too many slashes. */
    186 			}
    187 			if (i + 1 != _LC_LAST)
    188 				return (NULL);	/* too few slashes. */
    189 		}
    190 	}
    191 
    192 	if (category)
    193 		return (loadlocale(category));
    194 
    195 	loadlocale_success = 0;
    196 	for (i = 1; i < _LC_LAST; ++i) {
    197 		if (loadlocale(i) != NULL)
    198 			loadlocale_success = 1;
    199 	}
    200 
    201 	/*
    202 	 * If all categories failed, return NULL; we don't need to back
    203 	 * changes off, since none happened.
    204 	 */
    205 	if (!loadlocale_success)
    206 		return NULL;
    207 
    208 	return (currentlocale());
    209 }
    210 
    211 static char *
    212 currentlocale()
    213 {
    214 	int i;
    215 
    216 	(void)strlcpy(current_locale_string, current_categories[1],
    217 	    sizeof(current_locale_string));
    218 
    219 	for (i = 2; i < _LC_LAST; ++i)
    220 		if (strcmp(current_categories[1], current_categories[i])) {
    221 			(void)snprintf(current_locale_string,
    222 			    sizeof(current_locale_string), "%s/%s/%s/%s/%s/%s",
    223 			    current_categories[1], current_categories[2],
    224 			    current_categories[3], current_categories[4],
    225 			    current_categories[5], current_categories[6]);
    226 			break;
    227 		}
    228 	return (current_locale_string);
    229 }
    230 
    231 static int
    232 load_locale_sub(category, locname)
    233 	int category;
    234 	const char *locname;
    235 {
    236 	char name[PATH_MAX];
    237 
    238 	/* sanity check */
    239 	if (strchr(locname, '/') != NULL)
    240 		return -1;
    241 
    242 	(void)snprintf(name, sizeof(name), "%s/%s/%s",
    243 		       _PathLocale, locname, categories[category]);
    244 
    245 	switch (category) {
    246 	case LC_CTYPE:
    247 #ifdef WITH_RUNE
    248 		if (_xpg4_setrunelocale(__UNCONST(locname)))
    249 			return -1;
    250 		if (__runetable_to_netbsd_ctype(locname)) {
    251 			/* very unfortunate, but need to go to "C" locale */
    252 			(void)_xpg4_setrunelocale("C");
    253 			(void)__runetable_to_netbsd_ctype("C");
    254 			return -1;
    255 		}
    256 #else
    257 		if (!__loadctype(name))
    258 			return -1;
    259 #endif
    260 		break;
    261 
    262 	case LC_MESSAGES:
    263 		/*
    264 		 * XXX we don't have LC_MESSAGES support yet,
    265 		 * but catopen may use the value of LC_MESSAGES category.
    266 		 * so return successfully if locale directory is present.
    267 		 */
    268 		(void)snprintf(name, sizeof(name), "%s/%s",
    269 			_PathLocale, locname);
    270 		/* local */
    271 		{
    272 			struct stat st;
    273 			if (stat(name, &st) < 0)
    274 				return -1;
    275 			if (!S_ISDIR(st.st_mode))
    276 				return -1;
    277 		}
    278 		break;
    279 
    280 	case LC_COLLATE:
    281 	case LC_MONETARY:
    282 	case LC_NUMERIC:
    283 	case LC_TIME:
    284 		return -1;
    285 	}
    286 
    287 	return 0;
    288 }
    289 
    290 static char *
    291 loadlocale(category)
    292 	int category;
    293 {
    294 	char aliaspath[PATH_MAX], loccat[PATH_MAX], buf[PATH_MAX];
    295 	const char *alias;
    296 
    297 	_DIAGASSERT(0 < category && category < _LC_LAST);
    298 
    299 	if (strcmp(new_categories[category], current_categories[category]) == 0)
    300 		return (current_categories[category]);
    301 
    302 	if (!strcmp(new_categories[category], "C") ||
    303 	    !strcmp(new_categories[category], "POSIX")) {
    304 
    305 		switch (category) {
    306 		case LC_CTYPE:
    307 #ifdef WITH_RUNE
    308 			(void)_xpg4_setrunelocale("C");
    309 			(void)__runetable_to_netbsd_ctype("C");
    310 #else
    311 			if (_ctype_ != _C_ctype_) {
    312 				/* LINTED const castaway */
    313 				free((void *)_ctype_);
    314 				_ctype_ = _C_ctype_;
    315 			}
    316 			if (_toupper_tab_ != _C_toupper_) {
    317 				/* LINTED const castaway */
    318 				free((void *)_toupper_tab_);
    319 				_toupper_tab_ = _C_toupper_;
    320 			}
    321 			if (_tolower_tab_ != _C_tolower_) {
    322 				/* LINTED const castaway */
    323 				free((void *)_tolower_tab_);
    324 				_tolower_tab_ = _C_tolower_;
    325 			}
    326 #endif
    327 		}
    328 
    329 		(void)strlcpy(current_categories[category],
    330 		    new_categories[category],
    331 		    sizeof(current_categories[category]));
    332 		return current_categories[category];
    333 	}
    334 
    335 #if 0
    336 	(void)snprintf(name, sizeof(name), "%s/%s/%s",
    337 	    _PathLocale, new_categories[category], categories[category]);
    338 #endif
    339 
    340 	/* (1) non-aliased file */
    341 	if (!load_locale_sub(category, new_categories[category]))
    342 		goto success;
    343 
    344 	/* (2) lookup locname/catname type alias */
    345 	(void)snprintf(aliaspath, sizeof(aliaspath),
    346 		       "%s/" _LOCALE_ALIAS_NAME, _PathLocale);
    347 	(void)snprintf(loccat, sizeof(loccat), "%s/%s",
    348 		       new_categories[category], categories[category]);
    349 	alias = _lookup_alias(aliaspath, loccat, buf, sizeof(buf),
    350 			      _LOOKUP_CASE_SENSITIVE);
    351 	if (!load_locale_sub(category, alias))
    352 		goto success;
    353 
    354 	/* (3) lookup locname type alias */
    355 	alias = _lookup_alias(aliaspath, new_categories[category],
    356 			      buf, sizeof(buf), _LOOKUP_CASE_SENSITIVE);
    357 	if (!load_locale_sub(category, alias))
    358 		goto success;
    359 
    360 	return NULL;
    361 
    362 success:
    363 	(void)strlcpy(current_categories[category],
    364 		new_categories[category],
    365 		sizeof(current_categories[category]));
    366 	return current_categories[category];
    367 }
    368 
    369 static const char *
    370 __get_locale_env(category)
    371 	int category;
    372 {
    373 	const char *env;
    374 
    375 	_DIAGASSERT(category != LC_ALL);
    376 
    377 	/* 1. check LC_ALL. */
    378 	env = getenv(categories[0]);
    379 
    380 	/* 2. check LC_* */
    381 	if (!env || !*env)
    382 		env = getenv(categories[category]);
    383 
    384 	/* 3. check LANG */
    385 	if (!env || !*env)
    386 		env = getenv("LANG");
    387 
    388 	/* 4. if none is set, fall to "C" */
    389 	if (!env || !*env || strchr(env, '/'))
    390 		env = "C";
    391 
    392 	return env;
    393 }
    394