--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/c/memmem.c	Tue Aug 25 17:33:13 2009 -0400
@@ -0,0 +1,83 @@
+/* $NetBSD$ */
+ 
+/*-
+ * Copyright (c) 2003 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by 
+ *
+ * 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. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *        This product includes software developed by the NetBSD
+ *        Foundation, Inc. and its contributors.
+ * 4. Neither the name of The NetBSD Foundation 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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/cdefs.h>
+#if defined(LIBC_SCCS) && !defined(lint)
+__RCSID("$NetBSD$");
+#endif /* LIBC_SCCS and not lint */
+
+#if !defined(_KERNEL) && !defined(_STANDALONE)
+#include <assert.h>
+#include <string.h>
+#else
+#include <lib/libkern/libkern.h>
+#define _DIAGASSERT(x)  (void)0
+#define NULL            ((char *)0)
+#endif
+
+/*
+ * memmem() returns the location of the first occurence of data
+ * pattern b2 of size len2 in memory block b1 of size len1 or
+ * NULL if none is found.
+ */
+void *
+memmem(const void *b1, const void *b2, size_t len1, size_t len2)
+{
+        /* Initialize search pointer */
+        char *sp = (char *) b1;
+
+        /* Initialize pattern pointer */
+        char *pp = (char *) b2;
+
+        /* Intialize end of search address space pointer */
+        char *eos   = sp + len1 - len2;
+
+        /* Sanity check */
+        if(!(b1 && b2 && len1 && len2))
+                return NULL;
+
+        while (sp <= eos) {
+                if (*sp == *pp)
+                        if (memcmp(sp, pp, len2) == 0)
+                                return sp;
+
+                        sp++;
+        }
+
+        return NULL;
+}