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memmem.c
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memmem.c
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/* memmem.c -- replacement memmem() routine
*
* Copyright (c) 1994-2012 Carnegie Mellon University. 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.
*
* 3. The name "Carnegie Mellon University" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For permission or any legal
* details, please contact
* Carnegie Mellon University
* Center for Technology Transfer and Enterprise Creation
* 4615 Forbes Avenue
* Suite 302
* Pittsburgh, PA 15213
* (412) 268-7393, fax: (412) 268-7395
* innovation@andrew.cmu.edu
*
* 4. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by Computing Services
* at Carnegie Mellon University (http://www.cmu.edu/computing/)."
*
* CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
* THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
* FOR ANY SPECIAL, 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.
*/
#include <config.h>
#ifdef HAVE_STRING_H
#include <string.h>
#endif
/*
* Search for a needle 'vm' of length 'mlen' in
* haystack 'vb' of length 'len' and return the
* pointer to the first occurrence or NULL.
* Does not handle mlen=0.
*/
void *memmem(const void *vb, size_t len,
const void *vm, size_t mlen)
{
/* use unsigned char* not void* so ptr arithmetic works portably */
const unsigned char *b = vb;
const unsigned char *end = b+len;
const unsigned char *m = vm;
const unsigned char *p;
while (b < end) {
p = memchr(b, *m, end-b);
if (!p) return NULL;
if (p + mlen > end) return NULL;
if (!memcmp(p, m, mlen)) return (void *)p;
b = p+1;
}
return NULL;
}

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