mirror_zfs/zfs/lib/libport/strnlen.c
2008-11-20 12:01:55 -08:00

51 lines
1.3 KiB
C

/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2006 Sun Microsystems, Inc.
* All rights reserved. Use is subject to license terms.
*/
#include <string.h>
#include <sys/types.h>
#include "zfs_config.h"
/*
* Returns the number of non-NULL bytes in string argument,
* but not more than maxlen. Does not look past str + maxlen.
*/
#ifndef HAVE_STRNLEN
size_t
strnlen(const char *str, size_t maxlen)
{
const char *ptr;
ptr = memchr(str, 0, maxlen);
if (ptr == NULL)
return (maxlen);
return (ptr - str);
}
#endif