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/*-
* Copyright 2010 Nexenta Systems, Inc. All rights reserved.
* Copyright (c) 1995 Alex Tatmanjants <alex@elvisti.kiev.ua>
* at Electronni Visti IA, Kiev, Ukraine.
* All rights reserved.
*
* Copyright (c) 2011 The FreeBSD Foundation
* All rights reserved.
* Portions of this software were developed by David Chisnall
* under sponsorship from the FreeBSD Foundation.
*
* 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 ``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 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>
__FBSDID("$FreeBSD$");
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <wchar.h>
#include "collate.h"
/*
* In order to properly handle multibyte locales, its easiest to just
* convert to wide characters and then use wcscoll. However if an
* error occurs, we gracefully fall back to simple strcmp. Caller
* should check errno.
*/
int
strcoll_l(const char *s, const char *s2, locale_t locale)
{
int ret;
wchar_t *t1 = NULL, *t2 = NULL;
wchar_t *w1 = NULL, *w2 = NULL;
const char *cs1, *cs2;
mbstate_t mbs1;
mbstate_t mbs2;
size_t sz1, sz2;
memset(&mbs1, 0, sizeof (mbstate_t));
memset(&mbs2, 0, sizeof (mbstate_t));
/*
* The mbsrtowcs_l function can set the src pointer to null upon
* failure, so it should act on a copy to avoid:
* - sending null pointer to strcmp
* - having strcoll/strcoll_l change *s or *s2 to null
*/
cs1 = s;
cs2 = s2;
FIX_LOCALE(locale);
struct xlocale_collate *table =
(struct xlocale_collate*)locale->components[XLC_COLLATE];
if (table->__collate_load_error)
goto error;
sz1 = strlen(s) + 1;
sz2 = strlen(s2) + 1;
/*
* Simple assumption: conversion to wide format is strictly
* reducing, i.e. a single byte (or multibyte character)
* cannot result in multiple wide characters.
*/
if ((t1 = malloc(sz1 * sizeof (wchar_t))) == NULL)
goto error;
w1 = t1;
if ((t2 = malloc(sz2 * sizeof (wchar_t))) == NULL)
goto error;
w2 = t2;
if ((mbsrtowcs_l(w1, &cs1, sz1, &mbs1, locale)) == (size_t)-1)
goto error;
if ((mbsrtowcs_l(w2, &cs2, sz2, &mbs2, locale)) == (size_t)-1)
goto error;
ret = wcscoll_l(w1, w2, locale);
free(t1);
free(t2);
return (ret);
error:
free(t1);
free(t2);
return (strcmp(s, s2));
}
int
strcoll(const char *s, const char *s2)
{
return strcoll_l(s, s2, __get_locale());
}
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