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setlocale.c revision 1.62 
      1 /* $NetBSD: setlocale.c,v 1.62 2013/04/30 00:45:05 joerg Exp $ */
      2 
      3 /*-
      4  * Copyright (c)2008 Citrus Project,
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  */
     28 
     29 #include <sys/cdefs.h>
     30 #if defined(LIBC_SCCS) && !defined(lint)
     31 __RCSID("$NetBSD: setlocale.c,v 1.62 2013/04/30 00:45:05 joerg Exp $");
     32 #endif /* LIBC_SCCS and not lint */
     33 
     34 #include <sys/types.h>
     35 #include <locale.h>
     36 #include <limits.h>
     37 #include <paths.h>
     38 #include <stdlib.h>
     39 #include <string.h>
     40 #include <unistd.h>
     41 
     42 #include "setlocale_local.h"
     43 
     44 const char *_PathLocale = NULL;
     45 
     46 static _locale_set_t all_categories[_LC_LAST] = {
     47 	[LC_ALL     ] = &_generic_LC_ALL_setlocale,
     48 	[LC_COLLATE ] = &_dummy_LC_COLLATE_setlocale,
     49 	[LC_CTYPE   ] = &_citrus_LC_CTYPE_setlocale,
     50 	[LC_MONETARY] = &_citrus_LC_MONETARY_setlocale,
     51 	[LC_NUMERIC ] = &_citrus_LC_NUMERIC_setlocale,
     52 	[LC_TIME    ] = &_citrus_LC_TIME_setlocale,
     53 	[LC_MESSAGES] = &_citrus_LC_MESSAGES_setlocale,
     54 };
     55 
     56 _locale_set_t
     57 _find_category(int category)
     58 {
     59 	static int initialised;
     60 
     61 	if (!initialised) {
     62 		if (issetugid() || ((_PathLocale == NULL &&
     63 		    (_PathLocale = getenv("PATH_LOCALE")) == NULL) ||
     64 		    *_PathLocale == '\0'))
     65 			_PathLocale = _PATH_LOCALE;
     66 		initialised = 1;
     67 	}
     68 
     69 	if (category >= LC_ALL && category < _LC_LAST)
     70 		return all_categories[category];
     71 	return NULL;
     72 }
     73 
     74 const char *
     75 _get_locale_env(const char *category)
     76 {
     77 	const char *name;
     78 
     79 	/* 1. check LC_ALL */
     80 	name = (const char *)getenv("LC_ALL");
     81 	if (name == NULL || *name == '\0') {
     82 		/* 2. check LC_* */
     83 		name = (const char *)getenv(category);
     84 		if (name == NULL || *name == '\0') {
     85 			/* 3. check LANG */
     86 			name = getenv("LANG");
     87 		}
     88 	}
     89 	if (name == NULL || *name == '\0' || strchr(name, '/'))
     90 		/* 4. if none is set, fall to "C" */
     91 		name = _C_LOCALE;
     92 	return name;
     93 }
     94 
     95 char *
     96 __setlocale(int category, const char *name)
     97 {
     98 	_locale_set_t sl;
     99 	struct _locale *impl;
    100 
    101 	sl = _find_category(category);
    102 	if (sl == NULL)
    103 		return NULL;
    104 	impl = *_current_locale();
    105 	return __UNCONST((*sl)(name, impl));
    106 }
    107 
    108 char *
    109 setlocale(int category, const char *locale)
    110 {
    111 
    112 	/* locale may be NULL */
    113 
    114 	__mb_len_max_runtime = MB_LEN_MAX;
    115 	return __setlocale(category, locale);
    116 }
    117