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setlocale.c revision 1.46 
      1 /*	$NetBSD: setlocale.c,v 1.46 2004/07/21 18:51:30 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 1.46 2004/07/21 18:51:30 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 #include <citrus/citrus_bcs.h>
     71 
     72 #define _LOCALE_ALIAS_NAME	"locale.alias"
     73 #define _LOCALE_SYM_FORCE	"/force"
     74 
     75 /*
     76  * Category names for getenv()
     77  */
     78 static const char *const categories[_LC_LAST] = {
     79     "LC_ALL",
     80     "LC_COLLATE",
     81     "LC_CTYPE",
     82     "LC_MONETARY",
     83     "LC_NUMERIC",
     84     "LC_TIME",
     85     "LC_MESSAGES"
     86 };
     87 
     88 /*
     89  * Current locales for each category
     90  */
     91 static char current_categories[_LC_LAST][32] = {
     92     "C",
     93     "C",
     94     "C",
     95     "C",
     96     "C",
     97     "C",
     98     "C"
     99 };
    100 
    101 /*
    102  * The locales we are going to try and load
    103  */
    104 static char new_categories[_LC_LAST][32];
    105 
    106 static char current_locale_string[_LC_LAST * 33];
    107 char *_PathLocale;
    108 
    109 static char *currentlocale __P((void));
    110 static void revert_to_default __P((int));
    111 static int force_locale_enable __P((int));
    112 static int load_locale_sub __P((int, const char *, int));
    113 static char *loadlocale __P((int));
    114 static const char *__get_locale_env __P((int));
    115 
    116 char *
    117 __setlocale(category, locale)
    118 	int category;
    119 	const char *locale;
    120 {
    121 	int i, loadlocale_success;
    122 	size_t len;
    123 	const char *env, *r;
    124 
    125 	if (issetugid() ||
    126 	    (!_PathLocale && !(_PathLocale = getenv("PATH_LOCALE"))))
    127 		_PathLocale = _PATH_LOCALE;
    128 
    129 	if (category < 0 || category >= _LC_LAST)
    130 		return (NULL);
    131 
    132 	if (!locale)
    133 		return (category ?
    134 		    current_categories[category] : currentlocale());
    135 
    136 	/*
    137 	 * Default to the current locale for everything.
    138 	 */
    139 	for (i = 1; i < _LC_LAST; ++i)
    140 		(void)strlcpy(new_categories[i], current_categories[i],
    141 		    sizeof(new_categories[i]));
    142 
    143 	/*
    144 	 * Now go fill up new_categories from the locale argument
    145 	 */
    146 	if (!*locale) {
    147 		if (category == LC_ALL) {
    148 			for (i = 1; i < _LC_LAST; ++i) {
    149 				env = __get_locale_env(i);
    150 				(void)strlcpy(new_categories[i], env,
    151 				    sizeof(new_categories[i]));
    152 			}
    153 		}
    154 		else {
    155 			env = __get_locale_env(category);
    156 			(void)strlcpy(new_categories[category], env,
    157 				sizeof(new_categories[category]));
    158 		}
    159 	} else if (category) {
    160 		(void)strlcpy(new_categories[category], locale,
    161 		    sizeof(new_categories[category]));
    162 	} else {
    163 		if ((r = strchr(locale, '/')) == 0) {
    164 			for (i = 1; i < _LC_LAST; ++i) {
    165 				(void)strlcpy(new_categories[i], locale,
    166 				    sizeof(new_categories[i]));
    167 			}
    168 		} else {
    169 			for (i = 1;;) {
    170 				_DIAGASSERT(*r == '/' || *r == 0);
    171 				_DIAGASSERT(*locale != 0);
    172 				if (*locale == '/')
    173 					return (NULL);	/* invalid format. */
    174 				len = r - locale;
    175 				if (len + 1 > sizeof(new_categories[i]))
    176 					return (NULL);	/* too long */
    177 				(void)memcpy(new_categories[i], locale, len);
    178 				new_categories[i][len] = '\0';
    179 				if (*r == 0)
    180 					break;
    181 				_DIAGASSERT(*r == '/');
    182 				if (*(locale = ++r) == 0)
    183 					/* slash followed by NUL */
    184 					return (NULL);
    185 				/* skip until NUL or '/' */
    186 				while (*r && *r != '/')
    187 					r++;
    188 				if (++i == _LC_LAST)
    189 					return (NULL);	/* too many slashes. */
    190 			}
    191 			if (i + 1 != _LC_LAST)
    192 				return (NULL);	/* too few slashes. */
    193 		}
    194 	}
    195 
    196 	if (category)
    197 		return (loadlocale(category));
    198 
    199 	loadlocale_success = 0;
    200 	for (i = 1; i < _LC_LAST; ++i) {
    201 		if (loadlocale(i) != NULL)
    202 			loadlocale_success = 1;
    203 	}
    204 
    205 	/*
    206 	 * If all categories failed, return NULL; we don't need to back
    207 	 * changes off, since none happened.
    208 	 */
    209 	if (!loadlocale_success)
    210 		return NULL;
    211 
    212 	return (currentlocale());
    213 }
    214 
    215 static char *
    216 currentlocale()
    217 {
    218 	int i;
    219 
    220 	(void)strlcpy(current_locale_string, current_categories[1],
    221 	    sizeof(current_locale_string));
    222 
    223 	for (i = 2; i < _LC_LAST; ++i)
    224 		if (strcmp(current_categories[1], current_categories[i])) {
    225 			(void)snprintf(current_locale_string,
    226 			    sizeof(current_locale_string), "%s/%s/%s/%s/%s/%s",
    227 			    current_categories[1], current_categories[2],
    228 			    current_categories[3], current_categories[4],
    229 			    current_categories[5], current_categories[6]);
    230 			break;
    231 		}
    232 	return (current_locale_string);
    233 }
    234 
    235 static void
    236 revert_to_default(category)
    237 	int category;
    238 {
    239 	switch (category) {
    240 	case LC_CTYPE:
    241 #ifdef WITH_RUNE
    242 		(void)_xpg4_setrunelocale("C");
    243 		(void)__runetable_to_netbsd_ctype("C");
    244 #else
    245 		if (_ctype_ != _C_ctype_) {
    246 			/* LINTED const castaway */
    247 			free((void *)_ctype_);
    248 			_ctype_ = _C_ctype_;
    249 		}
    250 		if (_toupper_tab_ != _C_toupper_) {
    251 			/* LINTED const castaway */
    252 			free((void *)_toupper_tab_);
    253 			_toupper_tab_ = _C_toupper_;
    254 		}
    255 		if (_tolower_tab_ != _C_tolower_) {
    256 			/* LINTED const castaway */
    257 			free((void *)_tolower_tab_);
    258 			_tolower_tab_ = _C_tolower_;
    259 		}
    260 #endif
    261 		break;
    262 	case LC_MESSAGES:
    263 	case LC_COLLATE:
    264 	case LC_MONETARY:
    265 	case LC_NUMERIC:
    266 	case LC_TIME:
    267 		break;
    268 	}
    269 }
    270 
    271 static int
    272 force_locale_enable(category)
    273 	int category;
    274 {
    275 	revert_to_default(category);
    276 
    277 	return 0;
    278 }
    279 
    280 static int
    281 load_locale_sub(category, locname, isspecial)
    282 	int category;
    283 	const char *locname;
    284 	int isspecial;
    285 {
    286 	char name[PATH_MAX];
    287 
    288 	/* check for the default locales */
    289 	if (!strcmp(new_categories[category], "C") ||
    290 	    !strcmp(new_categories[category], "POSIX")) {
    291 		revert_to_default(category);
    292 		return 0;
    293 	}
    294 
    295 	/* check whether special symbol */
    296 	if (isspecial && _bcs_strcasecmp(locname, _LOCALE_SYM_FORCE) == 0)
    297 		return force_locale_enable(category);
    298 
    299 	/* sanity check */
    300 	if (strchr(locname, '/') != NULL)
    301 		return -1;
    302 
    303 	(void)snprintf(name, sizeof(name), "%s/%s/%s",
    304 		       _PathLocale, locname, categories[category]);
    305 
    306 	switch (category) {
    307 	case LC_CTYPE:
    308 #ifdef WITH_RUNE
    309 		if (_xpg4_setrunelocale(__UNCONST(locname)))
    310 			return -1;
    311 		if (__runetable_to_netbsd_ctype(locname)) {
    312 			/* very unfortunate, but need to go to "C" locale */
    313 			revert_to_default(category);
    314 			return -1;
    315 		}
    316 #else
    317 		if (!__loadctype(name))
    318 			return -1;
    319 #endif
    320 		break;
    321 
    322 	case LC_MESSAGES:
    323 		/*
    324 		 * XXX we don't have LC_MESSAGES support yet,
    325 		 * but catopen may use the value of LC_MESSAGES category.
    326 		 * so return successfully if locale directory is present.
    327 		 */
    328 		(void)snprintf(name, sizeof(name), "%s/%s",
    329 			_PathLocale, locname);
    330 		/* local */
    331 		{
    332 			struct stat st;
    333 			if (stat(name, &st) < 0)
    334 				return -1;
    335 			if (!S_ISDIR(st.st_mode))
    336 				return -1;
    337 		}
    338 		break;
    339 
    340 	case LC_COLLATE:
    341 	case LC_MONETARY:
    342 	case LC_NUMERIC:
    343 	case LC_TIME:
    344 		return -1;
    345 	}
    346 
    347 	return 0;
    348 }
    349 
    350 static char *
    351 loadlocale(category)
    352 	int category;
    353 {
    354 	char aliaspath[PATH_MAX], loccat[PATH_MAX], buf[PATH_MAX];
    355 	const char *alias;
    356 
    357 	_DIAGASSERT(0 < category && category < _LC_LAST);
    358 
    359 	if (strcmp(new_categories[category], current_categories[category]) == 0)
    360 		return (current_categories[category]);
    361 
    362 	/* (1) non-aliased file */
    363 	if (!load_locale_sub(category, new_categories[category], 0))
    364 		goto success;
    365 
    366 	/* (2) lookup locname/catname type alias */
    367 	(void)snprintf(aliaspath, sizeof(aliaspath),
    368 		       "%s/" _LOCALE_ALIAS_NAME, _PathLocale);
    369 	(void)snprintf(loccat, sizeof(loccat), "%s/%s",
    370 		       new_categories[category], categories[category]);
    371 	alias = _lookup_alias(aliaspath, loccat, buf, sizeof(buf),
    372 			      _LOOKUP_CASE_SENSITIVE);
    373 	if (!load_locale_sub(category, alias, 1))
    374 		goto success;
    375 
    376 	/* (3) lookup locname type alias */
    377 	alias = _lookup_alias(aliaspath, new_categories[category],
    378 			      buf, sizeof(buf), _LOOKUP_CASE_SENSITIVE);
    379 	if (!load_locale_sub(category, alias, 1))
    380 		goto success;
    381 
    382 	return NULL;
    383 
    384 success:
    385 	(void)strlcpy(current_categories[category],
    386 		new_categories[category],
    387 		sizeof(current_categories[category]));
    388 	return current_categories[category];
    389 }
    390 
    391 static const char *
    392 __get_locale_env(category)
    393 	int category;
    394 {
    395 	const char *env;
    396 
    397 	_DIAGASSERT(category != LC_ALL);
    398 
    399 	/* 1. check LC_ALL. */
    400 	env = getenv(categories[0]);
    401 
    402 	/* 2. check LC_* */
    403 	if (!env || !*env)
    404 		env = getenv(categories[category]);
    405 
    406 	/* 3. check LANG */
    407 	if (!env || !*env)
    408 		env = getenv("LANG");
    409 
    410 	/* 4. if none is set, fall to "C" */
    411 	if (!env || !*env || strchr(env, '/'))
    412 		env = "C";
    413 
    414 	return env;
    415 }
    416