1 /* @(#)strnlen.c	1.3 10/05/07 Copyright 2010 J. Schilling */
2 /*
3  *	strnlen() to be used if missing in libc
4  *
5  *	Copyright (c) 2010 J. Schilling
6  */
7 /*
8  * The contents of this file are subject to the terms of the
9  * Common Development and Distribution License, Version 1.0 only
10  * (the "License").  You may not use this file except in compliance
11  * with the License.
12  *
13  * See the file CDDL.Schily.txt in this distribution for details.
14  * A copy of the CDDL is also available via the Internet at
15  * http://www.opensource.org/licenses/cddl1.txt
16  *
17  * When distributing Covered Code, include this CDDL HEADER in each
18  * file and include the License file CDDL.Schily.txt from this distribution.
19  */
20 
21 #include <schily/standard.h>
22 #include <schily/unistd.h>
23 #include <schily/schily.h>
24 
25 #ifndef	HAVE_STRNLEN
26 
27 EXPORT size_t
strnlen(s,len)28 strnlen(s, len)
29 	register const char	*s;
30 	register size_t		len;
31 {
32 	register const char	*rs = s;
33 
34 	if (len == 0)
35 		return (0);
36 
37 	while (*rs++ != '\0' && --len > 0)
38 			;
39 	if (len == 0)
40 		return (rs - s);
41 	return (--rs - s);
42 }
43 
44 #endif
45