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setlocale.c revision 1.47 
      1 /*	$NetBSD: setlocale.c,v 1.47 2004/07/21 20:27:46 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 1.47 2004/07/21 20:27:46 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 #ifdef CITRUS
     68 #include <citrus/citrus_namespace.h>
     69 #include <citrus/citrus_region.h>
     70 #include <citrus/citrus_lookup.h>
     71 #include <citrus/citrus_bcs.h>
     72 #else
     73 #include <locale/aliasname_local.h>
     74 #define _lookup_alias(p, a, b, s, c)	__unaliasname((p), (a), (b), (s))
     75 #define _bcs_strcasecmp(a, b)		strcasecmp((a), (b))
     76 #endif
     77 
     78 #define _LOCALE_ALIAS_NAME	"locale.alias"
     79 #define _LOCALE_SYM_FORCE	"/force"
     80 
     81 /*
     82  * Category names for getenv()
     83  */
     84 static const char *const categories[_LC_LAST] = {
     85     "LC_ALL",
     86     "LC_COLLATE",
     87     "LC_CTYPE",
     88     "LC_MONETARY",
     89     "LC_NUMERIC",
     90     "LC_TIME",
     91     "LC_MESSAGES"
     92 };
     93 
     94 /*
     95  * Current locales for each category
     96  */
     97 static char current_categories[_LC_LAST][32] = {
     98     "C",
     99     "C",
    100     "C",
    101     "C",
    102     "C",
    103     "C",
    104     "C"
    105 };
    106 
    107 /*
    108  * The locales we are going to try and load
    109  */
    110 static char new_categories[_LC_LAST][32];
    111 
    112 static char current_locale_string[_LC_LAST * 33];
    113 char *_PathLocale;
    114 
    115 static char *currentlocale __P((void));
    116 static void revert_to_default __P((int));
    117 static int force_locale_enable __P((int));
    118 static int load_locale_sub __P((int, const char *, int));
    119 static char *loadlocale __P((int));
    120 static const char *__get_locale_env __P((int));
    121 
    122 char *
    123 __setlocale(category, locale)
    124 	int category;
    125 	const char *locale;
    126 {
    127 	int i, loadlocale_success;
    128 	size_t len;
    129 	const char *env, *r;
    130 
    131 	if (issetugid() ||
    132 	    (!_PathLocale && !(_PathLocale = getenv("PATH_LOCALE"))))
    133 		_PathLocale = _PATH_LOCALE;
    134 
    135 	if (category < 0 || category >= _LC_LAST)
    136 		return (NULL);
    137 
    138 	if (!locale)
    139 		return (category ?
    140 		    current_categories[category] : currentlocale());
    141 
    142 	/*
    143 	 * Default to the current locale for everything.
    144 	 */
    145 	for (i = 1; i < _LC_LAST; ++i)
    146 		(void)strlcpy(new_categories[i], current_categories[i],
    147 		    sizeof(new_categories[i]));
    148 
    149 	/*
    150 	 * Now go fill up new_categories from the locale argument
    151 	 */
    152 	if (!*locale) {
    153 		if (category == LC_ALL) {
    154 			for (i = 1; i < _LC_LAST; ++i) {
    155 				env = __get_locale_env(i);
    156 				(void)strlcpy(new_categories[i], env,
    157 				    sizeof(new_categories[i]));
    158 			}
    159 		}
    160 		else {
    161 			env = __get_locale_env(category);
    162 			(void)strlcpy(new_categories[category], env,
    163 				sizeof(new_categories[category]));
    164 		}
    165 	} else if (category) {
    166 		(void)strlcpy(new_categories[category], locale,
    167 		    sizeof(new_categories[category]));
    168 	} else {
    169 		if ((r = strchr(locale, '/')) == 0) {
    170 			for (i = 1; i < _LC_LAST; ++i) {
    171 				(void)strlcpy(new_categories[i], locale,
    172 				    sizeof(new_categories[i]));
    173 			}
    174 		} else {
    175 			for (i = 1;;) {
    176 				_DIAGASSERT(*r == '/' || *r == 0);
    177 				_DIAGASSERT(*locale != 0);
    178 				if (*locale == '/')
    179 					return (NULL);	/* invalid format. */
    180 				len = r - locale;
    181 				if (len + 1 > sizeof(new_categories[i]))
    182 					return (NULL);	/* too long */
    183 				(void)memcpy(new_categories[i], locale, len);
    184 				new_categories[i][len] = '\0';
    185 				if (*r == 0)
    186 					break;
    187 				_DIAGASSERT(*r == '/');
    188 				if (*(locale = ++r) == 0)
    189 					/* slash followed by NUL */
    190 					return (NULL);
    191 				/* skip until NUL or '/' */
    192 				while (*r && *r != '/')
    193 					r++;
    194 				if (++i == _LC_LAST)
    195 					return (NULL);	/* too many slashes. */
    196 			}
    197 			if (i + 1 != _LC_LAST)
    198 				return (NULL);	/* too few slashes. */
    199 		}
    200 	}
    201 
    202 	if (category)
    203 		return (loadlocale(category));
    204 
    205 	loadlocale_success = 0;
    206 	for (i = 1; i < _LC_LAST; ++i) {
    207 		if (loadlocale(i) != NULL)
    208 			loadlocale_success = 1;
    209 	}
    210 
    211 	/*
    212 	 * If all categories failed, return NULL; we don't need to back
    213 	 * changes off, since none happened.
    214 	 */
    215 	if (!loadlocale_success)
    216 		return NULL;
    217 
    218 	return (currentlocale());
    219 }
    220 
    221 static char *
    222 currentlocale()
    223 {
    224 	int i;
    225 
    226 	(void)strlcpy(current_locale_string, current_categories[1],
    227 	    sizeof(current_locale_string));
    228 
    229 	for (i = 2; i < _LC_LAST; ++i)
    230 		if (strcmp(current_categories[1], current_categories[i])) {
    231 			(void)snprintf(current_locale_string,
    232 			    sizeof(current_locale_string), "%s/%s/%s/%s/%s/%s",
    233 			    current_categories[1], current_categories[2],
    234 			    current_categories[3], current_categories[4],
    235 			    current_categories[5], current_categories[6]);
    236 			break;
    237 		}
    238 	return (current_locale_string);
    239 }
    240 
    241 static void
    242 revert_to_default(category)
    243 	int category;
    244 {
    245 	switch (category) {
    246 	case LC_CTYPE:
    247 #ifdef WITH_RUNE
    248 		(void)_xpg4_setrunelocale("C");
    249 		(void)__runetable_to_netbsd_ctype("C");
    250 #else
    251 		if (_ctype_ != _C_ctype_) {
    252 			/* LINTED const castaway */
    253 			free((void *)_ctype_);
    254 			_ctype_ = _C_ctype_;
    255 		}
    256 		if (_toupper_tab_ != _C_toupper_) {
    257 			/* LINTED const castaway */
    258 			free((void *)_toupper_tab_);
    259 			_toupper_tab_ = _C_toupper_;
    260 		}
    261 		if (_tolower_tab_ != _C_tolower_) {
    262 			/* LINTED const castaway */
    263 			free((void *)_tolower_tab_);
    264 			_tolower_tab_ = _C_tolower_;
    265 		}
    266 #endif
    267 		break;
    268 	case LC_MESSAGES:
    269 	case LC_COLLATE:
    270 	case LC_MONETARY:
    271 	case LC_NUMERIC:
    272 	case LC_TIME:
    273 		break;
    274 	}
    275 }
    276 
    277 static int
    278 force_locale_enable(category)
    279 	int category;
    280 {
    281 	revert_to_default(category);
    282 
    283 	return 0;
    284 }
    285 
    286 static int
    287 load_locale_sub(category, locname, isspecial)
    288 	int category;
    289 	const char *locname;
    290 	int isspecial;
    291 {
    292 	char name[PATH_MAX];
    293 
    294 	/* check for the default locales */
    295 	if (!strcmp(new_categories[category], "C") ||
    296 	    !strcmp(new_categories[category], "POSIX")) {
    297 		revert_to_default(category);
    298 		return 0;
    299 	}
    300 
    301 	/* check whether special symbol */
    302 	if (isspecial && _bcs_strcasecmp(locname, _LOCALE_SYM_FORCE) == 0)
    303 		return force_locale_enable(category);
    304 
    305 	/* sanity check */
    306 	if (strchr(locname, '/') != NULL)
    307 		return -1;
    308 
    309 	(void)snprintf(name, sizeof(name), "%s/%s/%s",
    310 		       _PathLocale, locname, categories[category]);
    311 
    312 	switch (category) {
    313 	case LC_CTYPE:
    314 #ifdef WITH_RUNE
    315 		if (_xpg4_setrunelocale(__UNCONST(locname)))
    316 			return -1;
    317 		if (__runetable_to_netbsd_ctype(locname)) {
    318 			/* very unfortunate, but need to go to "C" locale */
    319 			revert_to_default(category);
    320 			return -1;
    321 		}
    322 #else
    323 		if (!__loadctype(name))
    324 			return -1;
    325 #endif
    326 		break;
    327 
    328 	case LC_MESSAGES:
    329 		/*
    330 		 * XXX we don't have LC_MESSAGES support yet,
    331 		 * but catopen may use the value of LC_MESSAGES category.
    332 		 * so return successfully if locale directory is present.
    333 		 */
    334 		(void)snprintf(name, sizeof(name), "%s/%s",
    335 			_PathLocale, locname);
    336 		/* local */
    337 		{
    338 			struct stat st;
    339 			if (stat(name, &st) < 0)
    340 				return -1;
    341 			if (!S_ISDIR(st.st_mode))
    342 				return -1;
    343 		}
    344 		break;
    345 
    346 	case LC_COLLATE:
    347 	case LC_MONETARY:
    348 	case LC_NUMERIC:
    349 	case LC_TIME:
    350 		return -1;
    351 	}
    352 
    353 	return 0;
    354 }
    355 
    356 static char *
    357 loadlocale(category)
    358 	int category;
    359 {
    360 	char aliaspath[PATH_MAX], loccat[PATH_MAX], buf[PATH_MAX];
    361 	const char *alias;
    362 
    363 	_DIAGASSERT(0 < category && category < _LC_LAST);
    364 
    365 	if (strcmp(new_categories[category], current_categories[category]) == 0)
    366 		return (current_categories[category]);
    367 
    368 	/* (1) non-aliased file */
    369 	if (!load_locale_sub(category, new_categories[category], 0))
    370 		goto success;
    371 
    372 	/* (2) lookup locname/catname type alias */
    373 	(void)snprintf(aliaspath, sizeof(aliaspath),
    374 		       "%s/" _LOCALE_ALIAS_NAME, _PathLocale);
    375 	(void)snprintf(loccat, sizeof(loccat), "%s/%s",
    376 		       new_categories[category], categories[category]);
    377 	alias = _lookup_alias(aliaspath, loccat, buf, sizeof(buf),
    378 			      _LOOKUP_CASE_SENSITIVE);
    379 	if (!load_locale_sub(category, alias, 1))
    380 		goto success;
    381 
    382 	/* (3) lookup locname type alias */
    383 	alias = _lookup_alias(aliaspath, new_categories[category],
    384 			      buf, sizeof(buf), _LOOKUP_CASE_SENSITIVE);
    385 	if (!load_locale_sub(category, alias, 1))
    386 		goto success;
    387 
    388 	return NULL;
    389 
    390 success:
    391 	(void)strlcpy(current_categories[category],
    392 		new_categories[category],
    393 		sizeof(current_categories[category]));
    394 	return current_categories[category];
    395 }
    396 
    397 static const char *
    398 __get_locale_env(category)
    399 	int category;
    400 {
    401 	const char *env;
    402 
    403 	_DIAGASSERT(category != LC_ALL);
    404 
    405 	/* 1. check LC_ALL. */
    406 	env = getenv(categories[0]);
    407 
    408 	/* 2. check LC_* */
    409 	if (!env || !*env)
    410 		env = getenv(categories[category]);
    411 
    412 	/* 3. check LANG */
    413 	if (!env || !*env)
    414 		env = getenv("LANG");
    415 
    416 	/* 4. if none is set, fall to "C" */
    417 	if (!env || !*env || strchr(env, '/'))
    418 		env = "C";
    419 
    420 	return env;
    421 }
    422