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setlocale.c revision 1.35 
      1 /*	$NetBSD: setlocale.c,v 1.35 2001/04/17 20:12:32 kleink 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. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *	This product includes software developed by the University of
     21  *	California, Berkeley and its contributors.
     22  * 4. Neither the name of the University nor the names of its contributors
     23  *    may be used to endorse or promote products derived from this software
     24  *    without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     36  * SUCH DAMAGE.
     37  */
     38 
     39 #include <sys/cdefs.h>
     40 #if defined(LIBC_SCCS) && !defined(lint)
     41 #if 0
     42 static char sccsid[] = "@(#)setlocale.c	8.1 (Berkeley) 7/4/93";
     43 #else
     44 __RCSID("$NetBSD: setlocale.c,v 1.35 2001/04/17 20:12:32 kleink Exp $");
     45 #endif
     46 #endif /* LIBC_SCCS and not lint */
     47 
     48 #define _CTYPE_PRIVATE
     49 
     50 #include "namespace.h"
     51 #include <sys/localedef.h>
     52 #include <limits.h>
     53 #include <ctype.h>
     54 #define __SETLOCALE_SOURCE__
     55 #include <locale.h>
     56 #include <paths.h>
     57 #include <stdio.h>
     58 #include <stdlib.h>
     59 #include <string.h>
     60 #include <unistd.h>
     61 #ifdef WITH_RUNE
     62 #include "rune.h"
     63 #include "rune_local.h"
     64 #else
     65 #include "ctypeio.h"
     66 #endif
     67 
     68 /*
     69  * Category names for getenv()
     70  */
     71 static const char *const categories[_LC_LAST] = {
     72     "LC_ALL",
     73     "LC_COLLATE",
     74     "LC_CTYPE",
     75     "LC_MONETARY",
     76     "LC_NUMERIC",
     77     "LC_TIME",
     78     "LC_MESSAGES"
     79 };
     80 
     81 /*
     82  * Current locales for each category
     83  */
     84 static char current_categories[_LC_LAST][32] = {
     85     "C",
     86     "C",
     87     "C",
     88     "C",
     89     "C",
     90     "C",
     91     "C"
     92 };
     93 
     94 /*
     95  * The locales we are going to try and load
     96  */
     97 static char new_categories[_LC_LAST][32];
     98 
     99 /*
    100  * Backup area to back out changes on failure
    101  */
    102 static char saved_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 
    110 char *
    111 __setlocale(category, locale)
    112 	int category;
    113 	const char *locale;
    114 {
    115 	int i, loadlocale_success;
    116 	size_t len;
    117 	char *env, *r;
    118 
    119 	if (issetugid() ||
    120 	    (!_PathLocale && !(_PathLocale = getenv("PATH_LOCALE"))))
    121 		_PathLocale = _PATH_LOCALE;
    122 
    123 	if (category < 0 || category >= _LC_LAST)
    124 		return (NULL);
    125 
    126 	if (!locale)
    127 		return (category ?
    128 		    current_categories[category] : currentlocale());
    129 
    130 	/*
    131 	 * Default to the current locale for everything.
    132 	 */
    133 	for (i = 1; i < _LC_LAST; ++i)
    134 		(void)strlcpy(new_categories[i], current_categories[i],
    135 		    sizeof(new_categories[i]));
    136 
    137 	/*
    138 	 * Now go fill up new_categories from the locale argument
    139 	 */
    140 	if (!*locale) {
    141 		env = getenv(categories[category]);
    142 
    143 		if (!env || !*env)
    144 			env = getenv(categories[0]);
    145 
    146 		if (!env || !*env)
    147 			env = getenv("LANG");
    148 
    149 		if (!env || !*env || strchr(env, '/'))
    150 			env = "C";
    151 
    152 		(void)strlcpy(new_categories[category], env,
    153 		    sizeof(new_categories[category]));
    154 		if (!category) {
    155 			for (i = 1; i < _LC_LAST; ++i) {
    156 				env = getenv(categories[i]);
    157 				if (!env || !*env || strchr(env, '/'))
    158 					env = new_categories[0];
    159 				(void)strlcpy(new_categories[i], env,
    160 				    sizeof(new_categories[i]));
    161 			}
    162 		}
    163 	} else if (category) {
    164 		(void)strlcpy(new_categories[category], locale,
    165 		    sizeof(new_categories[category]));
    166 	} else {
    167 		if ((r = strchr(locale, '/')) == 0) {
    168 			for (i = 1; i < _LC_LAST; ++i) {
    169 				(void)strlcpy(new_categories[i], locale,
    170 				    sizeof(new_categories[i]));
    171 			}
    172 		} else {
    173 			for (i = 1; r[1] == '/'; ++r)
    174 				;
    175 			if (!r[1])
    176 				return (NULL);	/* Hmm, just slashes... */
    177 			do {
    178 				len = r - locale > sizeof(new_categories[i]) - 1
    179 					? sizeof(new_categories[i]) - 1
    180 					: r - locale;
    181 				(void)strncpy(new_categories[i++], locale, len);
    182 				new_categories[i++][len] = 0;
    183 				locale = r;
    184 				while (*locale == '/')
    185 				    ++locale;
    186 				while (*++r && *r != '/');
    187 			} while (*locale);
    188 			while (i < _LC_LAST)
    189 				(void)strlcpy(new_categories[i],
    190 				    new_categories[i - 1],
    191 				    sizeof(new_categories[i]));
    192 		}
    193 	}
    194 
    195 	if (category)
    196 		return (loadlocale(category));
    197 
    198 	loadlocale_success = 0;
    199 	for (i = 1; i < _LC_LAST; ++i) {
    200 		(void)strlcpy(saved_categories[i], current_categories[i],
    201 		    sizeof(saved_categories[i]));
    202 		if (loadlocale(i) != NULL)
    203 			loadlocale_success = 1;
    204 	}
    205 
    206 	/*
    207 	 * If all categories failed, return NULL; we don't need to back
    208 	 * changes off, since none happened.
    209 	 */
    210 	if (!loadlocale_success)
    211 		return NULL;
    212 
    213 	return (currentlocale());
    214 }
    215 
    216 static char *
    217 currentlocale()
    218 {
    219 	int i;
    220 
    221 	(void)strlcpy(current_locale_string, current_categories[1],
    222 	    sizeof(current_locale_string));
    223 
    224 	for (i = 2; i < _LC_LAST; ++i)
    225 		if (strcmp(current_categories[1], current_categories[i])) {
    226 			(void)snprintf(current_locale_string,
    227 			    sizeof(current_locale_string), "%s/%s/%s/%s/%s",
    228 			    current_categories[1], current_categories[2],
    229 			    current_categories[3], current_categories[4],
    230 			    current_categories[5]);
    231 			break;
    232 		}
    233 	return (current_locale_string);
    234 }
    235 
    236 static char *
    237 loadlocale(category)
    238 	int category;
    239 {
    240 	char name[PATH_MAX];
    241 
    242 	if (strcmp(new_categories[category], current_categories[category]) == 0)
    243 		return (current_categories[category]);
    244 
    245 	if (!strcmp(new_categories[category], "C") ||
    246 	    !strcmp(new_categories[category], "POSIX")) {
    247 
    248 		switch (category) {
    249 		case LC_CTYPE:
    250 #ifdef WITH_RUNE
    251 			(void)_xpg4_setrunelocale("C");
    252 			(void)__runetable_to_netbsd_ctype("C");
    253 #else
    254 			if (_ctype_ != _C_ctype_) {
    255 				/* LINTED const castaway */
    256 				free((void *)_ctype_);
    257 				_ctype_ = _C_ctype_;
    258 			}
    259 			if (_toupper_tab_ != _C_toupper_) {
    260 				/* LINTED const castaway */
    261 				free((void *)_toupper_tab_);
    262 				_toupper_tab_ = _C_toupper_;
    263 			}
    264 			if (_tolower_tab_ != _C_tolower_) {
    265 				/* LINTED const castaway */
    266 				free((void *)_tolower_tab_);
    267 				_tolower_tab_ = _C_tolower_;
    268 			}
    269 #endif
    270 		}
    271 
    272 		(void)strlcpy(current_categories[category],
    273 		    new_categories[category],
    274 		    sizeof(current_categories[category]));
    275 		return current_categories[category];
    276 	}
    277 
    278 	/*
    279 	 * Some day we will actually look at this file.
    280 	 */
    281 	(void)snprintf(name, sizeof(name), "%s/%s/%s",
    282 	    _PathLocale, new_categories[category], categories[category]);
    283 
    284 	switch (category) {
    285 	case LC_CTYPE:
    286 #ifdef WITH_RUNE
    287 		if (_xpg4_setrunelocale(new_categories[category]))
    288 			return NULL;
    289 		if (__runetable_to_netbsd_ctype(new_categories[category])) {
    290 			/* very unfortunate, but need to go to "C" locale */
    291 			(void)_xpg4_setrunelocale("C");
    292 			(void)__runetable_to_netbsd_ctype("C");
    293 			return NULL;
    294 		}
    295 #else
    296 		if (!__loadctype(name))
    297 			return NULL;
    298 #endif
    299 
    300 		(void)strlcpy(current_categories[category],
    301 		    new_categories[category],
    302 		    sizeof(current_categories[category]));
    303 		return current_categories[category];
    304 
    305 	case LC_COLLATE:
    306 	case LC_MESSAGES:
    307 	case LC_MONETARY:
    308 	case LC_NUMERIC:
    309 	case LC_TIME:
    310 		return NULL;
    311 	}
    312 
    313 	return NULL;
    314 }
    315