/*      $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)