xref: /titanic_44/usr/src/lib/libc/port/i18n/wcsnlen.c (revision 56b2bdd1f04d465cfe4a95b88ae5cba5884154e4)
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 (c) 2010, Oracle and/or its affiliates. All rights reserved.
24  */
25 
26 /*
27  * Returns the number of non-NULL characters in str,
28  * but not more than maxlen.  Does not look past str + maxlen.
29  */
30 
31 #include "lint.h"
32 #include <stdlib.h>
33 #include <wchar.h>
34 
35 size_t
36 wcsnlen(const wchar_t *str, size_t maxlen)
37 {
38 	const wchar_t *ptr = str;
39 
40 	if (maxlen != 0) {
41 		do {
42 			if (*ptr++ == L'\0') {
43 				ptr--;
44 				break;
45 			}
46 		} while (--maxlen != 0);
47 	}
48 
49 	return (ptr - str);
50 }
51