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setlocale.c revision 1.53 
      1 /*	$NetBSD: setlocale.c,v 1.53 2008/05/17 03:49:54 ginsbach Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1991, 1993, 2008
      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 1.53 2008/05/17 03:49:54 ginsbach 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 #include "lcmessages.h"
     67 #include "lcmonetary.h"
     68 #include "lcnumeric.h"
     69 #include "lctime.h"
     70 
     71 #ifdef CITRUS
     72 #include <citrus/citrus_namespace.h>
     73 #include <citrus/citrus_region.h>
     74 #include <citrus/citrus_lookup.h>
     75 #include <citrus/citrus_bcs.h>
     76 #else
     77 #include <locale/aliasname_local.h>
     78 #define _lookup_alias(p, a, b, s, c)	__unaliasname((p), (a), (b), (s))
     79 #define _bcs_strcasecmp(a, b)		strcasecmp((a), (b))
     80 #endif
     81 
     82 #define _LOCALE_SYM_FORCE	"/force"
     83 
     84 /*
     85  * Category names for getenv()
     86  */
     87 static const char *const categories[_LC_LAST] = {
     88     "LC_ALL",
     89     "LC_COLLATE",
     90     "LC_CTYPE",
     91     "LC_MONETARY",
     92     "LC_NUMERIC",
     93     "LC_TIME",
     94     "LC_MESSAGES"
     95 };
     96 
     97 /*
     98  * Current locales for each category
     99  */
    100 static char current_categories[_LC_LAST][32] = {
    101     "C",
    102     "C",
    103     "C",
    104     "C",
    105     "C",
    106     "C",
    107     "C"
    108 };
    109 
    110 /*
    111  * The locales we are going to try and load
    112  */
    113 static char new_categories[_LC_LAST][32];
    114 
    115 static char current_locale_string[_LC_LAST * 33];
    116 
    117 static char *currentlocale __P((void));
    118 static void revert_to_default __P((int));
    119 static int force_locale_enable __P((int));
    120 static int load_locale_sub __P((int, const char *, int));
    121 static char *loadlocale __P((int));
    122 static const char *__get_locale_env __P((int));
    123 
    124 char *
    125 __setlocale(category, locale)
    126 	int category;
    127 	const char *locale;
    128 {
    129 	int i, loadlocale_success;
    130 	size_t len;
    131 	const char *env, *r;
    132 
    133 	if (issetugid() ||
    134 	    (!_PathLocale && !(_PathLocale = getenv("PATH_LOCALE"))))
    135 		_PathLocale = _PATH_LOCALE;
    136 
    137 	if (category < 0 || category >= _LC_LAST)
    138 		return (NULL);
    139 
    140 	if (!locale)
    141 		return (category ?
    142 		    current_categories[category] : currentlocale());
    143 
    144 	/*
    145 	 * Default to the current locale for everything.
    146 	 */
    147 	for (i = 1; i < _LC_LAST; ++i)
    148 		(void)strlcpy(new_categories[i], current_categories[i],
    149 		    sizeof(new_categories[i]));
    150 
    151 	/*
    152 	 * Now go fill up new_categories from the locale argument
    153 	 */
    154 	if (!*locale) {
    155 		if (category == LC_ALL) {
    156 			for (i = 1; i < _LC_LAST; ++i) {
    157 				env = __get_locale_env(i);
    158 				(void)strlcpy(new_categories[i], env,
    159 				    sizeof(new_categories[i]));
    160 			}
    161 		}
    162 		else {
    163 			env = __get_locale_env(category);
    164 			(void)strlcpy(new_categories[category], env,
    165 				sizeof(new_categories[category]));
    166 		}
    167 	} else if (category) {
    168 		(void)strlcpy(new_categories[category], locale,
    169 		    sizeof(new_categories[category]));
    170 	} else {
    171 		if ((r = strchr(locale, '/')) == 0) {
    172 			for (i = 1; i < _LC_LAST; ++i) {
    173 				(void)strlcpy(new_categories[i], locale,
    174 				    sizeof(new_categories[i]));
    175 			}
    176 		} else {
    177 			for (i = 1;;) {
    178 				_DIAGASSERT(*r == '/' || *r == 0);
    179 				_DIAGASSERT(*locale != 0);
    180 				if (*locale == '/')
    181 					return (NULL);	/* invalid format. */
    182 				len = r - locale;
    183 				if (len + 1 > sizeof(new_categories[i]))
    184 					return (NULL);	/* too long */
    185 				(void)memcpy(new_categories[i], locale, len);
    186 				new_categories[i][len] = '\0';
    187 				if (*r == 0)
    188 					break;
    189 				_DIAGASSERT(*r == '/');
    190 				if (*(locale = ++r) == 0)
    191 					/* slash followed by NUL */
    192 					return (NULL);
    193 				/* skip until NUL or '/' */
    194 				while (*r && *r != '/')
    195 					r++;
    196 				if (++i == _LC_LAST)
    197 					return (NULL);	/* too many slashes. */
    198 			}
    199 			if (i + 1 != _LC_LAST)
    200 				return (NULL);	/* too few slashes. */
    201 		}
    202 	}
    203 
    204 	if (category)
    205 		return (loadlocale(category));
    206 
    207 	loadlocale_success = 0;
    208 	for (i = 1; i < _LC_LAST; ++i) {
    209 		if (loadlocale(i) != NULL)
    210 			loadlocale_success = 1;
    211 	}
    212 
    213 	/*
    214 	 * If all categories failed, return NULL; we don't need to back
    215 	 * changes off, since none happened.
    216 	 */
    217 	if (!loadlocale_success)
    218 		return NULL;
    219 
    220 	return (currentlocale());
    221 }
    222 
    223 static char *
    224 currentlocale()
    225 {
    226 	int i;
    227 
    228 	(void)strlcpy(current_locale_string, current_categories[1],
    229 	    sizeof(current_locale_string));
    230 
    231 	for (i = 2; i < _LC_LAST; ++i)
    232 		if (strcmp(current_categories[1], current_categories[i])) {
    233 			(void)snprintf(current_locale_string,
    234 			    sizeof(current_locale_string), "%s/%s/%s/%s/%s/%s",
    235 			    current_categories[1], current_categories[2],
    236 			    current_categories[3], current_categories[4],
    237 			    current_categories[5], current_categories[6]);
    238 			break;
    239 		}
    240 	return (current_locale_string);
    241 }
    242 
    243 static void
    244 revert_to_default(category)
    245 	int category;
    246 {
    247 	switch (category) {
    248 	case LC_CTYPE:
    249 #ifdef WITH_RUNE
    250 		(void)_xpg4_setrunelocale("C");
    251 #else
    252 		if (_ctype_ != _C_ctype_) {
    253 			/* LINTED const castaway */
    254 			free((void *)_ctype_);
    255 			_ctype_ = _C_ctype_;
    256 		}
    257 		if (_toupper_tab_ != _C_toupper_) {
    258 			/* LINTED const castaway */
    259 			free((void *)_toupper_tab_);
    260 			_toupper_tab_ = _C_toupper_;
    261 		}
    262 		if (_tolower_tab_ != _C_tolower_) {
    263 			/* LINTED const castaway */
    264 			free((void *)_tolower_tab_);
    265 			_tolower_tab_ = _C_tolower_;
    266 		}
    267 #endif
    268 		break;
    269 	case LC_TIME:
    270 		if (_CurrentTimeLocale != &_DefaultTimeLocale) {
    271 			free(__UNCONST(_CurrentTimeLocale));
    272 			_CurrentTimeLocale = &_DefaultTimeLocale;
    273 		}
    274 		break;
    275 	case LC_MESSAGES:
    276 		if (_CurrentMessagesLocale != &_DefaultMessagesLocale) {
    277 			free(__UNCONST(_CurrentMessagesLocale));
    278 			_CurrentMessagesLocale = &_DefaultMessagesLocale;
    279 		}
    280 		break;
    281 	case LC_COLLATE:
    282 		break;
    283 	case LC_MONETARY:
    284 		if (_CurrentMonetaryLocale != &_DefaultMonetaryLocale) {
    285 			free(__UNCONST(_CurrentMonetaryLocale));
    286 			_CurrentMonetaryLocale = &_DefaultMonetaryLocale;
    287 		}
    288 		break;
    289 	case LC_NUMERIC:
    290 		if (_CurrentNumericLocale != &_DefaultNumericLocale) {
    291 			free(__UNCONST(_CurrentNumericLocale));
    292 			_CurrentNumericLocale = &_DefaultNumericLocale;
    293 		}
    294 		break;
    295 	}
    296 }
    297 
    298 static int
    299 force_locale_enable(category)
    300 	int category;
    301 {
    302 	revert_to_default(category);
    303 
    304 	return 0;
    305 }
    306 
    307 static int
    308 load_locale_sub(category, locname, isspecial)
    309 	int category;
    310 	const char *locname;
    311 	int isspecial;
    312 {
    313 	char name[PATH_MAX];
    314 
    315 	/* check for the default locales */
    316 	if (!strcmp(new_categories[category], "C") ||
    317 	    !strcmp(new_categories[category], "POSIX")) {
    318 		revert_to_default(category);
    319 		return 0;
    320 	}
    321 
    322 	/* check whether special symbol */
    323 	if (isspecial && _bcs_strcasecmp(locname, _LOCALE_SYM_FORCE) == 0)
    324 		return force_locale_enable(category);
    325 
    326 	/* sanity check */
    327 	if (strchr(locname, '/') != NULL)
    328 		return -1;
    329 
    330 	(void)snprintf(name, sizeof(name), "%s/%s/%s",
    331 		       _PathLocale, locname, categories[category]);
    332 
    333 	switch (category) {
    334 	case LC_CTYPE:
    335 #ifdef WITH_RUNE
    336 		if (_xpg4_setrunelocale(__UNCONST(locname)))
    337 			return -1;
    338 #else
    339 		if (!__loadctype(name))
    340 			return -1;
    341 #endif
    342 		break;
    343 
    344 	case LC_MESSAGES:
    345 #ifdef OLD_NO_LC_MESSAGES
    346 		/*
    347 		 * XXX we don't have LC_MESSAGES support yet,
    348 		 * but catopen may use the value of LC_MESSAGES category.
    349 		 * so return successfully if locale directory is present.
    350 		 */
    351 		(void)snprintf(name, sizeof(name), "%s/%s",
    352 			_PathLocale, locname);
    353 		/* local */
    354 		{
    355 			struct stat st;
    356 			if (stat(name, &st) < 0)
    357 				return -1;
    358 			if (!S_ISDIR(st.st_mode))
    359 				return -1;
    360 		}
    361 #else
    362 		if (!__loadmessages(name))
    363 			return -1;
    364 #endif
    365 		break;
    366 
    367 	case LC_TIME:
    368 		if (!__loadtime(name))
    369 			return -1;
    370 		break;
    371 	case LC_COLLATE:
    372 		return -1;
    373 	case LC_MONETARY:
    374 		if (!__loadmonetary(name))
    375 			return -1;
    376 		break;
    377 	case LC_NUMERIC:
    378 		if (!__loadnumeric(name))
    379 			return -1;
    380 		break;
    381 	}
    382 
    383 	return 0;
    384 }
    385 
    386 static char *
    387 loadlocale(category)
    388 	int category;
    389 {
    390 	char aliaspath[PATH_MAX], loccat[PATH_MAX], buf[PATH_MAX];
    391 	const char *alias;
    392 
    393 	_DIAGASSERT(0 < category && category < _LC_LAST);
    394 
    395 	if (strcmp(new_categories[category], current_categories[category]) == 0)
    396 		return (current_categories[category]);
    397 
    398 	/* (1) non-aliased file */
    399 	if (!load_locale_sub(category, new_categories[category], 0))
    400 		goto success;
    401 
    402 	/* (2) lookup locname/catname type alias */
    403 	(void)snprintf(aliaspath, sizeof(aliaspath),
    404 		       "%s/" _LOCALE_ALIAS_NAME, _PathLocale);
    405 	(void)snprintf(loccat, sizeof(loccat), "%s/%s",
    406 		       new_categories[category], categories[category]);
    407 	alias = _lookup_alias(aliaspath, loccat, buf, sizeof(buf),
    408 			      _LOOKUP_CASE_SENSITIVE);
    409 	if (!load_locale_sub(category, alias, 1))
    410 		goto success;
    411 
    412 	/* (3) lookup locname type alias */
    413 	alias = _lookup_alias(aliaspath, new_categories[category],
    414 			      buf, sizeof(buf), _LOOKUP_CASE_SENSITIVE);
    415 	if (!load_locale_sub(category, alias, 1))
    416 		goto success;
    417 
    418 	return NULL;
    419 
    420 success:
    421 	(void)strlcpy(current_categories[category],
    422 		new_categories[category],
    423 		sizeof(current_categories[category]));
    424 	return current_categories[category];
    425 }
    426 
    427 static const char *
    428 __get_locale_env(category)
    429 	int category;
    430 {
    431 	const char *env;
    432 
    433 	_DIAGASSERT(category != LC_ALL);
    434 
    435 	/* 1. check LC_ALL. */
    436 	env = getenv(categories[0]);
    437 
    438 	/* 2. check LC_* */
    439 	if (!env || !*env)
    440 		env = getenv(categories[category]);
    441 
    442 	/* 3. check LANG */
    443 	if (!env || !*env)
    444 		env = getenv("LANG");
    445 
    446 	/* 4. if none is set, fall to "C" */
    447 	if (!env || !*env || strchr(env, '/'))
    448 		env = "C";
    449 
    450 	return env;
    451 }
    452