1/* $NetBSD: strncpy.S,v 1.5 2013/09/07 19:06:29 chs Exp $ */ 2 3/*- 4 * Copyright (c) 1990 The Regents of the University of California. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * the Systems Programming Group of the University of Utah Computer 9 * Science Department. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36#include <machine/asm.h> 37 38#if defined(LIBC_SCCS) && !defined(lint) 39#if 0 40 RCSID("from: @(#)strncpy.s 5.1 (Berkeley) 5/12/90") 41#else 42 RCSID("$NetBSD: strncpy.S,v 1.5 2013/09/07 19:06:29 chs Exp $") 43#endif 44#endif /* LIBC_SCCS and not lint */ 45 46ENTRY(strncpy) 47 movl 4(%sp),%d0 | return value is toaddr 48 movl 12(%sp),%d1 | count 49 jeq .Lscdone | nothing to do 50 movl 8(%sp),%a0 | a0 = fromaddr 51 movl %d0,%a1 | a1 = toaddr 52 subql #1,%d1 53.Lscloop: 54 movb (%a0)+,(%a1)+ | copy a byte 55#ifndef __mcoldfire__ 56 dbeq %d1,.Lscloop | loop through low word of d1 57#endif 58 jeq .Lscpadding | copied null, padding if necessary 59#ifndef __mcoldfire__ 60 clrw %d1 | clear low word of d1 61#endif 62 subql #1,%d1 | adjust count for long copies 63 jcc .Lscloop | more room, keep going 64.Lscdone: 65#ifdef __SVR4_ABI__ 66 moveal %d0,%a0 67#endif 68 rts 69 70.Lscploop: 71 clrb (%a1)+ | clear a byte 72#ifndef __mcoldfire__ 73 dbra %d1,.Lscploop | keep going 74 clrw %d1 75#endif 76.Lscpadding: 77 subql #1,%d1 78 jcc .Lscploop 79 jra .Lscdone 80END(strncpy) 81