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      1 /* $NetBSD: newlocale.c,v 1.5 2024/01/20 14:52:48 christos Exp $ */
      2 
      3 /*-
      4  * Copyright (c)2008, 2011 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 __RCSID("$NetBSD: newlocale.c,v 1.5 2024/01/20 14:52:48 christos Exp $");
     31 
     32 #include "namespace.h"
     33 #include <assert.h>
     34 #include <errno.h>
     35 #include <locale.h>
     36 #include <stdlib.h>
     37 #include <string.h>
     38 
     39 #include "setlocale_local.h"
     40 
     41 __weak_alias(newlocale, _newlocale)
     42 
     43 locale_t
     44 newlocale(int mask, const char *name, locale_t src)
     45 {
     46 	struct _locale *dst;
     47 	char head[_LOCALENAME_LEN_MAX * (_LC_LAST - 1)], *tail;
     48 	const char *tokens[_LC_LAST - 1];
     49 	_locale_set_t l;
     50 	int i, howmany, categories[_LC_LAST - 1];
     51 
     52 	if (name == NULL)
     53 		name = _C_LOCALE;
     54 	dst = malloc(sizeof(*dst));
     55 	if (dst == NULL)
     56 		return (locale_t)NULL;
     57 	if (src == NULL)
     58 		src = _current_locale();
     59 	memcpy(dst, src, sizeof(*src));
     60 	if (strlcpy(&head[0], name, sizeof(head)) >= sizeof(head)) {
     61 		free(dst);
     62 		return (locale_t)NULL;
     63 	}
     64 	tokens[0] = (const char *)&head[0];
     65 	tail = __UNCONST(strchr(tokens[0], '/'));
     66 	if (tail == NULL) {
     67 		for (i = 1; i < _LC_LAST; ++i) {
     68 			if (mask & (1 << i)) {
     69 				l = _find_category(i);
     70 				_DIAGASSERT(l != NULL);
     71 				(*l)(tokens[0], dst);
     72 			}
     73 		}
     74 	} else {
     75 		*tail++ = '\0';
     76 		howmany = 0;
     77 		for (i = 1; i < _LC_LAST; ++i) {
     78 			if (mask & (1 << i))
     79 				categories[howmany++] = i;
     80 		}
     81 		if (howmany-- > 0) {
     82 			for (i = 1; i < howmany; ++i) {
     83 				*tail++ = '\0';
     84 				tokens[i] = (const char *)tail;
     85 				tail = __UNCONST(strchr(tokens[i], '/'));
     86 				if (tail == NULL) {
     87 					free(dst);
     88 					return NULL;
     89 				}
     90 			}
     91 			*tail++ = '\0';
     92 			tokens[howmany] = tail;
     93 			tail = __UNCONST(strchr(tokens[howmany], '/'));
     94 			if (tail != NULL) {
     95 				free(dst);
     96 				return NULL;
     97 			}
     98 			for (i = 0; i <= howmany; ++i) {
     99 				l = _find_category(categories[i]);
    100 				_DIAGASSERT(l != NULL);
    101 				(*l)(tokens[i], dst);
    102 			}
    103 		}
    104 	}
    105 	if (_setlocale_cache(dst, NULL)) {
    106 		free(dst);
    107 		return NULL;
    108 	}
    109 	return (locale_t)dst;
    110 }
    111