1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22 /*
23 * Copyright 2008 Sun Microsystems, Inc.
24 * All rights reserved. Use is subject to license terms.
25 */
26
27 #pragma ident "%Z%%M% %I% %E% SMI"
28
29 #include "lint.h"
30 #include <string.h>
31 #include <sys/types.h>
32
33 /*
34 * Returns the number of non-NULL bytes in string argument,
35 * but not more than maxlen. Does not look past str + maxlen.
36 */
37 size_t
strnlen(const char * str,size_t maxlen)38 strnlen(const char *str, size_t maxlen)
39 {
40 const char *ptr;
41
42 ptr = memchr(str, 0, maxlen);
43 if (ptr == NULL)
44 return (maxlen);
45
46 return (ptr - str);
47 }
48