/*
* Copyright 2013 Garrett D'Amore <garrett@damore.org>
* 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.
*
* 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 "lint.h"
#include "file64.h"
#include <alloca.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <wchar.h>
#include <xlocale.h>
#include "localeimpl.h"
#include "collate.h"
#define ALLOCA_LIMIT 16
/*
* In order to properly handle multibyte locales, its easiet 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 *s1, const char *s2, locale_t loc)
{
int ret;
wchar_t *t1 = NULL, *t2 = NULL;
wchar_t *w1 = NULL, *w2 = NULL;
size_t sz1, sz2;
const struct lc_collate *lcc = loc->collate;
if (lcc->lc_is_posix)
return (strcmp(s1, s2));
sz1 = strlen(s1) + 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.
*
* We gain a bit of performance by giving preference to alloca
* for small string allocations.
*/
if (sz1 > ALLOCA_LIMIT) {
if ((t1 = malloc(sz1 * sizeof (wchar_t))) == NULL)
goto error;
w1 = t1;
} else {
if ((w1 = alloca(sz1 * sizeof (wchar_t))) == NULL)
goto error;
}
if (sz2 > ALLOCA_LIMIT) {
if ((t2 = malloc(sz2 * sizeof (wchar_t))) == NULL)
goto error;
w2 = t2;
} else {
if ((w2 = alloca(sz2 * sizeof (wchar_t))) == NULL)
goto error;
}
if ((mbstowcs_l(w1, s1, sz1, loc)) == (size_t)-1)
goto error;
if ((mbstowcs_l(w2, s2, sz2, loc)) == (size_t)-1)
goto error;
ret = wcscoll_l(w1, w2, loc);
if (t1)
free(t1);
if (t2)
free(t2);
return (ret);
error:
if (t1)
free(t1);
if (t2)
free(t2);
return (strcmp(s1, s2));
}
int
strcoll(const char *s1, const char *s2)
{
return (strcoll_l(s1, s2, uselocale(NULL)));
}