41 lines
1.2 KiB
C
41 lines
1.2 KiB
C
|
/* $OpenBSD: memrchr.c,v 1.2 2007/11/27 16:22:12 martynas Exp $ */
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Copyright (c) 2007 Todd C. Miller <Todd.Miller@courtesan.com>
|
||
|
|
*
|
||
|
|
* Permission to use, copy, modify, and distribute this software for any
|
||
|
|
* purpose with or without fee is hereby granted, provided that the above
|
||
|
|
* copyright notice and this permission notice appear in all copies.
|
||
|
|
*
|
||
|
|
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
|
||
|
|
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
|
||
|
|
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
|
||
|
|
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
||
|
|
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
|
||
|
|
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
|
||
|
|
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
||
|
|
*
|
||
|
|
* $FreeBSD$
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <string.h>
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Reverse memchr()
|
||
|
|
* Find the last occurrence of 'c' in the buffer 's' of size 'n'.
|
||
|
|
*/
|
||
|
|
void *
|
||
|
|
memrchr(const void *s, int c, size_t n)
|
||
|
|
{
|
||
|
|
const unsigned char *cp;
|
||
|
|
|
||
|
|
if (n != 0) {
|
||
|
|
cp = (unsigned char *)s + n;
|
||
|
|
do {
|
||
|
|
if (*(--cp) == (unsigned char)c)
|
||
|
|
return((void *)cp);
|
||
|
|
} while (--n != 0);
|
||
|
|
}
|
||
|
|
return(NULL);
|
||
|
|
}
|