/* $NetBSD: newlocale.c,v 1.5 2024/01/20 14:52:48 christos Exp $ */

/*-
 * Copyright (c)2008, 2011 Citrus Project,
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>
__RCSID("$NetBSD: newlocale.c,v 1.5 2024/01/20 14:52:48 christos Exp $");

#include "namespace.h"
#include <assert.h>
#include <errno.h>
#include <locale.h>
#include <stdlib.h>
#include <string.h>

#include "setlocale_local.h"

__weak_alias(newlocale, _newlocale)

locale_t
newlocale(int mask, const char *name, locale_t src)
{
        struct _locale *dst;
        char head[_LOCALENAME_LEN_MAX * (_LC_LAST - 1)], *tail;
        const char *tokens[_LC_LAST - 1];
        _locale_set_t l;
        int i, howmany, categories[_LC_LAST - 1];

        if (name == NULL)
                name = _C_LOCALE;
        dst = malloc(sizeof(*dst));
        if (dst == NULL)
                return (locale_t)NULL;
        if (src == NULL)
                src = _current_locale();
        memcpy(dst, src, sizeof(*src));
        if (strlcpy(&head[0], name, sizeof(head)) >= sizeof(head)) {
                free(dst);
                return (locale_t)NULL;
        }
        tokens[0] = (const char *)&head[0];
        tail = __UNCONST(strchr(tokens[0], '/'));
        if (tail == NULL) {
                for (i = 1; i < _LC_LAST; ++i) {
                        if (mask & (1 << i)) {
                                l = _find_category(i);
                                _DIAGASSERT(l != NULL);
                                (*l)(tokens[0], dst);
                        }
                }
        } else {
                *tail++ = '\0';
                howmany = 0;
                for (i = 1; i < _LC_LAST; ++i) {
                        if (mask & (1 << i))
                                categories[howmany++] = i;
                }
                if (howmany-- > 0) {
                        for (i = 1; i < howmany; ++i) {
                                *tail++ = '\0';
                                tokens[i] = (const char *)tail;
                                tail = __UNCONST(strchr(tokens[i], '/'));
                                if (tail == NULL) {
                                        free(dst);
                                        return NULL;
                                }
                        }
                        *tail++ = '\0';
                        tokens[howmany] = tail;
                        tail = __UNCONST(strchr(tokens[howmany], '/'));
                        if (tail != NULL) {
                                free(dst);
                                return NULL;
                        }
                        for (i = 0; i <= howmany; ++i) {
                                l = _find_category(categories[i]);
                                _DIAGASSERT(l != NULL);
                                (*l)(tokens[i], dst);
                        }
                }
        }
        if (_setlocale_cache(dst, NULL)) {
                free(dst);
                return NULL;
        }
        return (locale_t)dst;
}