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setlocale.c revision 1.44 
      1 /*	$NetBSD: setlocale.c,v 1.44 2004/07/21 14:18:16 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 1.44 2004/07/21 14:18:16 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 char *loadlocale __P((int));
    109 static const char *__get_locale_env __P((int));
    110 
    111 char *
    112 __setlocale(category, locale)
    113 	int category;
    114 	const char *locale;
    115 {
    116 	int i, loadlocale_success;
    117 	size_t len;
    118 	const char *env, *r;
    119 
    120 	if (issetugid() ||
    121 	    (!_PathLocale && !(_PathLocale = getenv("PATH_LOCALE"))))
    122 		_PathLocale = _PATH_LOCALE;
    123 
    124 	if (category < 0 || category >= _LC_LAST)
    125 		return (NULL);
    126 
    127 	if (!locale)
    128 		return (category ?
    129 		    current_categories[category] : currentlocale());
    130 
    131 	/*
    132 	 * Default to the current locale for everything.
    133 	 */
    134 	for (i = 1; i < _LC_LAST; ++i)
    135 		(void)strlcpy(new_categories[i], current_categories[i],
    136 		    sizeof(new_categories[i]));
    137 
    138 	/*
    139 	 * Now go fill up new_categories from the locale argument
    140 	 */
    141 	if (!*locale) {
    142 		if (category == LC_ALL) {
    143 			for (i = 1; i < _LC_LAST; ++i) {
    144 				env = __get_locale_env(i);
    145 				(void)strlcpy(new_categories[i], env,
    146 				    sizeof(new_categories[i]));
    147 			}
    148 		}
    149 		else {
    150 			env = __get_locale_env(category);
    151 			(void)strlcpy(new_categories[category], env,
    152 				sizeof(new_categories[category]));
    153 		}
    154 	} else if (category) {
    155 		(void)strlcpy(new_categories[category], locale,
    156 		    sizeof(new_categories[category]));
    157 	} else {
    158 		if ((r = strchr(locale, '/')) == 0) {
    159 			for (i = 1; i < _LC_LAST; ++i) {
    160 				(void)strlcpy(new_categories[i], locale,
    161 				    sizeof(new_categories[i]));
    162 			}
    163 		} else {
    164 			for (i = 1;;) {
    165 				_DIAGASSERT(*r == '/' || *r == 0);
    166 				_DIAGASSERT(*locale != 0);
    167 				if (*locale == '/')
    168 					return (NULL);	/* invalid format. */
    169 				len = r - locale;
    170 				if (len + 1 > sizeof(new_categories[i]))
    171 					return (NULL);	/* too long */
    172 				(void)memcpy(new_categories[i], locale, len);
    173 				new_categories[i][len] = '\0';
    174 				if (*r == 0)
    175 					break;
    176 				_DIAGASSERT(*r == '/');
    177 				if (*(locale = ++r) == 0)
    178 					/* slash followed by NUL */
    179 					return (NULL);
    180 				/* skip until NUL or '/' */
    181 				while (*r && *r != '/')
    182 					r++;
    183 				if (++i == _LC_LAST)
    184 					return (NULL);	/* too many slashes. */
    185 			}
    186 			if (i + 1 != _LC_LAST)
    187 				return (NULL);	/* too few slashes. */
    188 		}
    189 	}
    190 
    191 	if (category)
    192 		return (loadlocale(category));
    193 
    194 	loadlocale_success = 0;
    195 	for (i = 1; i < _LC_LAST; ++i) {
    196 		if (loadlocale(i) != NULL)
    197 			loadlocale_success = 1;
    198 	}
    199 
    200 	/*
    201 	 * If all categories failed, return NULL; we don't need to back
    202 	 * changes off, since none happened.
    203 	 */
    204 	if (!loadlocale_success)
    205 		return NULL;
    206 
    207 	return (currentlocale());
    208 }
    209 
    210 static char *
    211 currentlocale()
    212 {
    213 	int i;
    214 
    215 	(void)strlcpy(current_locale_string, current_categories[1],
    216 	    sizeof(current_locale_string));
    217 
    218 	for (i = 2; i < _LC_LAST; ++i)
    219 		if (strcmp(current_categories[1], current_categories[i])) {
    220 			(void)snprintf(current_locale_string,
    221 			    sizeof(current_locale_string), "%s/%s/%s/%s/%s/%s",
    222 			    current_categories[1], current_categories[2],
    223 			    current_categories[3], current_categories[4],
    224 			    current_categories[5], current_categories[6]);
    225 			break;
    226 		}
    227 	return (current_locale_string);
    228 }
    229 
    230 static int
    231 load_locale_sub(category, locname)
    232 	int category;
    233 	const char *locname;
    234 {
    235 	char name[PATH_MAX];
    236 
    237 	/* sanity check */
    238 	if (strchr(locname, '/') != NULL)
    239 		return -1;
    240 
    241 	(void)snprintf(name, sizeof(name), "%s/%s/%s",
    242 		       _PathLocale, locname, categories[category]);
    243 
    244 	switch (category) {
    245 	case LC_CTYPE:
    246 #ifdef WITH_RUNE
    247 		if (_xpg4_setrunelocale(__UNCONST(locname)))
    248 			return -1;
    249 		if (__runetable_to_netbsd_ctype(locname)) {
    250 			/* very unfortunate, but need to go to "C" locale */
    251 			(void)_xpg4_setrunelocale("C");
    252 			(void)__runetable_to_netbsd_ctype("C");
    253 			return -1;
    254 		}
    255 #else
    256 		if (!__loadctype(name))
    257 			return -1;
    258 #endif
    259 		break;
    260 
    261 	case LC_MESSAGES:
    262 		/*
    263 		 * XXX we don't have LC_MESSAGES support yet,
    264 		 * but catopen may use the value of LC_MESSAGES category.
    265 		 * so return successfully if locale directory is present.
    266 		 */
    267 		(void)snprintf(name, sizeof(name), "%s/%s",
    268 			_PathLocale, locname);
    269 		/* local */
    270 		{
    271 			struct stat st;
    272 			if (stat(name, &st) < 0)
    273 				return -1;
    274 			if (!S_ISDIR(st.st_mode))
    275 				return -1;
    276 		}
    277 		break;
    278 
    279 	case LC_COLLATE:
    280 	case LC_MONETARY:
    281 	case LC_NUMERIC:
    282 	case LC_TIME:
    283 		return -1;
    284 	}
    285 
    286 	return 0;
    287 }
    288 
    289 static char *
    290 loadlocale(category)
    291 	int category;
    292 {
    293 	char aliaspath[PATH_MAX], loccat[PATH_MAX], buf[PATH_MAX];
    294 	const char *alias;
    295 
    296 	_DIAGASSERT(0 < category && category < _LC_LAST);
    297 
    298 	if (strcmp(new_categories[category], current_categories[category]) == 0)
    299 		return (current_categories[category]);
    300 
    301 	if (!strcmp(new_categories[category], "C") ||
    302 	    !strcmp(new_categories[category], "POSIX")) {
    303 
    304 		switch (category) {
    305 		case LC_CTYPE:
    306 #ifdef WITH_RUNE
    307 			(void)_xpg4_setrunelocale("C");
    308 			(void)__runetable_to_netbsd_ctype("C");
    309 #else
    310 			if (_ctype_ != _C_ctype_) {
    311 				/* LINTED const castaway */
    312 				free((void *)_ctype_);
    313 				_ctype_ = _C_ctype_;
    314 			}
    315 			if (_toupper_tab_ != _C_toupper_) {
    316 				/* LINTED const castaway */
    317 				free((void *)_toupper_tab_);
    318 				_toupper_tab_ = _C_toupper_;
    319 			}
    320 			if (_tolower_tab_ != _C_tolower_) {
    321 				/* LINTED const castaway */
    322 				free((void *)_tolower_tab_);
    323 				_tolower_tab_ = _C_tolower_;
    324 			}
    325 #endif
    326 		}
    327 
    328 		(void)strlcpy(current_categories[category],
    329 		    new_categories[category],
    330 		    sizeof(current_categories[category]));
    331 		return current_categories[category];
    332 	}
    333 
    334 #if 0
    335 	(void)snprintf(name, sizeof(name), "%s/%s/%s",
    336 	    _PathLocale, new_categories[category], categories[category]);
    337 #endif
    338 
    339 	/* (1) non-aliased file */
    340 	if (!load_locale_sub(category, new_categories[category]))
    341 		goto success;
    342 
    343 	/* (2) lookup locname/catname type alias */
    344 	(void)snprintf(aliaspath, sizeof(aliaspath),
    345 		       "%s/" _LOCALE_ALIAS_NAME, _PathLocale);
    346 	(void)snprintf(loccat, sizeof(loccat), "%s/%s",
    347 		       new_categories[category], categories[category]);
    348 	alias = _lookup_alias(aliaspath, loccat, buf, sizeof(buf),
    349 			      _LOOKUP_CASE_SENSITIVE);
    350 	if (!load_locale_sub(category, alias))
    351 		goto success;
    352 
    353 	/* (3) lookup locname type alias */
    354 	alias = _lookup_alias(aliaspath, new_categories[category],
    355 			      buf, sizeof(buf), _LOOKUP_CASE_SENSITIVE);
    356 	if (!load_locale_sub(category, alias))
    357 		goto success;
    358 
    359 	return NULL;
    360 
    361 success:
    362 	(void)strlcpy(current_categories[category],
    363 		new_categories[category],
    364 		sizeof(current_categories[category]));
    365 	return current_categories[category];
    366 }
    367 
    368 static const char *
    369 __get_locale_env(category)
    370 	int category;
    371 {
    372 	const char *env;
    373 
    374 	_DIAGASSERT(category != LC_ALL);
    375 
    376 	/* 1. check LC_ALL. */
    377 	env = getenv(categories[0]);
    378 
    379 	/* 2. check LC_* */
    380 	if (!env || !*env)
    381 		env = getenv(categories[category]);
    382 
    383 	/* 3. check LANG */
    384 	if (!env || !*env)
    385 		env = getenv("LANG");
    386 
    387 	/* 4. if none is set, fall to "C" */
    388 	if (!env || !*env || strchr(env, '/'))
    389 		env = "C";
    390 
    391 	return env;
    392 }
    393