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/* $OpenBSD: lsearch.c,v 1.7 2021/12/08 22:06:28 cheloha Exp $ */
/*
* Copyright (c) 1989, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Roger L. Snyder.
*
* 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.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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/types.h>
#include <string.h>
#include <search.h>
typedef int (*cmp_fn_t)(const void *, const void *);
void *
lsearch(const void *key, void *base, size_t *nelp, size_t width,
cmp_fn_t compar)
{
void *element = lfind(key, base, nelp, width, compar);
/*
* Use memmove(3) to ensure the key is copied cleanly into the
* array, even if the key overlaps with the end of the array.
*/
if (element == NULL) {
element = memmove((char *)base + *nelp * width, key, width);
*nelp += 1;
}
return element;
}
void *
lfind(const void *key, const void *base, size_t *nelp, size_t width,
cmp_fn_t compar)
{
const char *element, *end;
end = (const char *)base + *nelp * width;
for (element = base; element < end; element += width)
if (!compar(key, element)) /* key found */
return((void *)element);
return NULL;
}
DEF_WEAK(lfind);
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