add memchr to libkern

1 files changed, 66 insertions, 0 deletions

diff --git a/sys/lib/libkern/memchr.c b/sys/lib/libkern/memchr.c
new file mode 100644
index 00000000000..e5553d96693
--- /dev/null
+++ b/sys/lib/libkern/memchr.c
@@ -0,0 +1,66 @@
+/*	$OpenBSD: memchr.c,v 1.1 1997/11/04 19:07:58 chuck Exp $	*/
+
+/*-
+ * Copyright (c) 1990 The Regents of the University of California.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Chris Torek.
+ *
+ * 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 University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+/*static char *sccsid = "from: @(#)memchr.c     5.6 (Berkeley) 1/26/91";*/
+static char *rcsid = "$NetBSD: memchr.c,v 1.2 1997/10/24 18:10:30 mjacob Exp $";
+#endif /* LIBC_SCCS and not lint */
+
+#ifndef _KERNEL
+#include <string.h>
+#else
+#include <lib/libkern/libkern.h>
+#define	NULL	((char *)0)
+#endif 
+
+void *
+memchr(s, c, n)
+	const void *s;
+	register unsigned char c;
+	register size_t n;
+{
+	if (n != 0) {
+		register const unsigned char *p = s;
+
+		do {
+			if (*p++ == c)
+				return ((void *)(p - 1));
+		} while (--n != 0);
+	}
+	return (NULL);
+}