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