adamc@1268: #include "config.h"
adamc@1268: 
adamc@914: /* $NetBSD$ */
adamc@914:  
adamc@914: /*-
adamc@914:  * Copyright (c) 2003 The NetBSD Foundation, Inc.
adamc@914:  * All rights reserved.
adamc@914:  *
adamc@914:  * This code is derived from software contributed to The NetBSD Foundation
adamc@914:  * by 
adamc@914:  *
adamc@914:  * Redistribution and use in source and binary forms, with or without
adamc@914:  * modification, are permitted provided that the following conditions
adamc@914:  * are met:
adamc@914:  * 1. Redistributions of source code must retain the above copyright
adamc@914:  *    notice, this list of conditions and the following disclaimer.
adamc@914:  * 2. Redistributions in binary form must reproduce the above copyright
adamc@914:  *    notice, this list of conditions and the following disclaimer in the
adamc@914:  *    documentation and/or other materials provided with the distribution.
adamc@914:  * 3. All advertising materials mentioning features or use of this software
adamc@914:  *    must display the following acknowledgement:
adamc@914:  *        This product includes software developed by the NetBSD
adamc@914:  *        Foundation, Inc. and its contributors.
adamc@914:  * 4. Neither the name of The NetBSD Foundation nor the names of its
adamc@914:  *    contributors may be used to endorse or promote products derived
adamc@914:  *    from this software without specific prior written permission.
adamc@914:  *
adamc@914:  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
adamc@914:  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
adamc@914:  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
adamc@914:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
adamc@914:  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
adamc@914:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
adamc@914:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
adamc@914:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
adamc@914:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
adamc@914:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
adamc@914:  * POSSIBILITY OF SUCH DAMAGE.
adamc@914:  */
adamc@914: 
adamc@914: #include <sys/cdefs.h>
adamc@914: #if defined(LIBC_SCCS) && !defined(lint)
adamc@914: __RCSID("$NetBSD$");
adamc@914: #endif /* LIBC_SCCS and not lint */
adamc@914: 
adamc@914: #if !defined(_KERNEL) && !defined(_STANDALONE)
adamc@914: #include <assert.h>
adamc@914: #include <string.h>
adamc@914: #else
adamc@914: #include <lib/libkern/libkern.h>
adamc@914: #define _DIAGASSERT(x)  (void)0
adamc@914: #define NULL            ((char *)0)
adamc@914: #endif
adamc@914: 
adamc@914: /*
adamc@914:  * memmem() returns the location of the first occurence of data
adamc@914:  * pattern b2 of size len2 in memory block b1 of size len1 or
adamc@914:  * NULL if none is found.
adamc@914:  */
adamc@914: void *
adamc@920: memmem(const void *b1, size_t len1, const void *b2, size_t len2)
adamc@914: {
adamc@914:         /* Initialize search pointer */
adamc@914:         char *sp = (char *) b1;
adamc@914: 
adamc@914:         /* Initialize pattern pointer */
adamc@914:         char *pp = (char *) b2;
adamc@914: 
adamc@914:         /* Intialize end of search address space pointer */
adamc@914:         char *eos   = sp + len1 - len2;
adamc@914: 
adamc@914:         /* Sanity check */
adamc@914:         if(!(b1 && b2 && len1 && len2))
adamc@914:                 return NULL;
adamc@914: 
adamc@914:         while (sp <= eos) {
adamc@914:                 if (*sp == *pp)
adamc@914:                         if (memcmp(sp, pp, len2) == 0)
adamc@914:                                 return sp;
adamc@914: 
adamc@914:                         sp++;
adamc@914:         }
adamc@914: 
adamc@914:         return NULL;
adamc@914: }