1/* $OpenBSD: strlen.S,v 1.2 2001/08/20 20:15:29 jason Exp $ */ 2/* $NetBSD: strlen.S,v 1.1.1.1 1998/06/20 05:18:14 eeh Exp $ */ 3 4/* 5 * Copyright (c) 1992, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This software was developed by the Computer Systems Engineering group 9 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 10 * contributed to Berkeley. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by the University of 23 * California, Berkeley and its contributors. 24 * 4. Neither the name of the University nor the names of its contributors 25 * may be used to endorse or promote products derived from this software 26 * without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38 * SUCH DAMAGE. 39 * 40 * Header: strlen.s,v 1.1 92/06/25 12:52:47 torek Exp 41 */ 42 43#if defined(LIBC_SCCS) && !defined(lint) 44#ifdef notdef 45 .asciz "@(#)strlen.s 8.1 (Berkeley) 6/4/93" 46#endif 47 .asciz "$NetBSD: strlen.S,v 1.1.1.1 1998/06/20 05:18:14 eeh Exp $" 48#endif /* LIBC_SCCS and not lint */ 49 50#include "DEFS.h" 51 52ENTRY(strlen) 53 add %o0, 1, %o1 ! save starting point + 1 541: 55 ldsb [%o0], %o2 ! fetch byte 56 tst %o2 ! null? 57 bne 1b ! no, keep going 58 inc %o0 ! always increment pointer 59 retl 60 sub %o0, %o1, %o0 ! return length (ptr - (origptr+1)) 61