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authorGravatar Adam Chlipala <adamc@hcoop.net>2009-08-25 17:33:13 -0400
committerGravatar Adam Chlipala <adamc@hcoop.net>2009-08-25 17:33:13 -0400
commitb1f297cea35d2fa47aa8193d3d90ddf8eb98afaa (patch)
tree0c17c4e2488fadc7daa109118e623a4871c9bdb8 /src/c/memmem.c
parenta7efb65ad2482f9af8e56d628b69811cea5ad56d (diff)
New release
Diffstat (limited to 'src/c/memmem.c')
-rw-r--r--src/c/memmem.c83
1 files changed, 83 insertions, 0 deletions
diff --git a/src/c/memmem.c b/src/c/memmem.c
new file mode 100644
index 00000000..e0687a28
--- /dev/null
+++ b/src/c/memmem.c
@@ -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;
+}