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 #include "lint.h" 28 #include <string.h> 29 #include <sys/types.h> 30 31 /* 32 * Returns the number of non-NULL bytes in string argument, 33 * but not more than maxlen. Does not look past str + maxlen. 34 */ 35 size_t 36 strnlen(const char *str, size_t maxlen) 37 { 38 const char *ptr; 39 40 ptr = memchr(str, 0, maxlen); 41 if (ptr == NULL) 42 return (maxlen); 43 44 return (ptr - str); 45 } 46