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 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