74 lines
2.7 KiB
ArmAsm
74 lines
2.7 KiB
ArmAsm
|
/* $NetBSD: strncpy.S,v 1.1 2005/12/20 19:28:49 christos Exp $ */
|
||
|
|
|
||
|
|
/*-
|
||
|
|
* Copyright (c) 1990 The Regents of the University of California.
|
||
|
|
* All rights reserved.
|
||
|
|
*
|
||
|
|
* This code is derived from software contributed to Berkeley by
|
||
|
|
* the Systems Programming Group of the University of Utah Computer
|
||
|
|
* Science Department.
|
||
|
|
*
|
||
|
|
* Redistribution and use in source and binary forms, with or without
|
||
|
|
* modification, are permitted provided that the following conditions
|
||
|
|
* are met:
|
||
|
|
* 1. Redistributions of source code must retain the above copyright
|
||
|
|
* notice, this list of conditions and the following disclaimer.
|
||
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
||
|
|
* notice, this list of conditions and the following disclaimer in the
|
||
|
|
* documentation and/or other materials provided with the distribution.
|
||
|
|
* 3. Neither the name of the University nor the names of its contributors
|
||
|
|
* may be used to endorse or promote products derived from this software
|
||
|
|
* without specific prior written permission.
|
||
|
|
*
|
||
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
||
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
||
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
||
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
||
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
||
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
||
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
||
|
|
* SUCH DAMAGE.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <machine/asm.h>
|
||
|
|
|
||
|
|
#if defined(LIBC_SCCS) && !defined(lint)
|
||
|
|
#if 0
|
||
|
|
RCSID("from: @(#)strncpy.s 5.1 (Berkeley) 5/12/90")
|
||
|
|
#else
|
||
|
|
RCSID("$NetBSD: strncpy.S,v 1.1 2005/12/20 19:28:49 christos Exp $")
|
||
|
|
#endif
|
||
|
|
#endif /* LIBC_SCCS and not lint */
|
||
|
|
|
||
|
|
ENTRY(strncpy)
|
||
|
|
movl %sp@(4),%d0 | return value is toaddr
|
||
|
|
movl %sp@(12),%d1 | count
|
||
|
|
jeq Lscdone | nothing to do
|
||
|
|
movl %sp@(8),%a0 | a0 = fromaddr
|
||
|
|
movl %d0,%a1 | a1 = toaddr
|
||
|
|
subql #1,%d1
|
||
|
|
Lscloop:
|
||
|
|
movb %a0@+,%a1@+ | copy a byte
|
||
|
|
dbeq %d1,Lscloop | loop through low word of d1
|
||
|
|
jeq Lscpadding | copied null, padding if necessary
|
||
|
|
clrw %d1 | clear low word of d1
|
||
|
|
subql #1,%d1 | adjust count for long copies
|
||
|
|
jcc Lscloop | more room, keep going
|
||
|
|
Lscdone:
|
||
|
|
#ifdef __SVR4_ABI__
|
||
|
|
moveal %d0,%a0
|
||
|
|
#endif
|
||
|
|
rts
|
||
|
|
|
||
|
|
Lscploop:
|
||
|
|
clrb %a1@+ | clear a byte
|
||
|
|
dbra %d1,Lscploop | keep going
|
||
|
|
clrw %d1
|
||
|
|
Lscpadding:
|
||
|
|
subql #1,%d1
|
||
|
|
jcc Lscploop
|
||
|
|
jra Lscdone
|