minix/common/lib/libc/arch/m68k/string/strncpy.S
Lionel Sambuc 84d9c625bf Synchronize on NetBSD-CVS (2013/12/1 12:00:00 UTC)
- Fix for possible unset uid/gid in toproto
 - Fix for default mtree style
 - Update libelf
 - Importing libexecinfo
 - Resynchronize GCC, mpc, gmp, mpfr
 - build.sh: Replace params with show-params.
     This has been done as the make target has been renamed in the same
     way, while a new target named params has been added. This new
     target generates a file containing all the parameters, instead of
     printing it on the console.
 - Update test48 with new etc/services (Fix by Ben Gras <ben@minix3.org)
     get getservbyport() out of the inner loop

Change-Id: Ie6ad5226fa2621ff9f0dee8782ea48f9443d2091
2014-07-28 17:05:06 +02:00

80 lines
2.7 KiB
ArmAsm

/* $NetBSD: strncpy.S,v 1.5 2013/09/07 19:06:29 chs 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 1.5 2013/09/07 19:06:29 chs Exp $")
#endif
#endif /* LIBC_SCCS and not lint */
ENTRY(strncpy)
movl 4(%sp),%d0 | return value is toaddr
movl 12(%sp),%d1 | count
jeq .Lscdone | nothing to do
movl 8(%sp),%a0 | a0 = fromaddr
movl %d0,%a1 | a1 = toaddr
subql #1,%d1
.Lscloop:
movb (%a0)+,(%a1)+ | copy a byte
#ifndef __mcoldfire__
dbeq %d1,.Lscloop | loop through low word of d1
#endif
jeq .Lscpadding | copied null, padding if necessary
#ifndef __mcoldfire__
clrw %d1 | clear low word of d1
#endif
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
#ifndef __mcoldfire__
dbra %d1,.Lscploop | keep going
clrw %d1
#endif
.Lscpadding:
subql #1,%d1
jcc .Lscploop
jra .Lscdone
END(strncpy)