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/*
* Copyright (c) 1999 Todd C. Miller <Todd.Miller@courtesan.com>
* All rights reserved.
*
* 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. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED ``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 AUTHOR 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 "DEFS.h"
#if defined(LIBC_SCCS)
.text
.asciz "$OpenBSD: strlcpy.S,v 1.2 1999/04/30 22:07:13 millert Exp $"
#endif /* LIBC_SCCS */
ENTRY(strlcpy)
movl sp@(4),a1 | a1 = dst
movl sp@(8),a0 | a0 = src
movl a0,a2 | a2 = orig_src
movl sp@(12),d1 | d1 = orig_count
movl d1,d0 | d0 = count
beq slcloop | don't let count wrap...
subql #1,d0 | subtract one for the NUL
slcloop:
tstb a0@ | got a NUL in src?
beq slcnul | if so, add NUL to dst and we're done
tstl d0 | only copy bytes if count is non-zero
beq slcinc | (else just increment src ptr)
movb a0@,a1@+ | copy a byte but only increment dst
subql #1,d0 | decrement count
slcinc:
addql #1,a0 | increment src ptr
jra slcloop | keep going...
slcnul:
tstl d1 | make sure we had a non-zero orig_count
beq slcdone
clrb a1@ | clear last byte
slcdone:
movl a0,d0
subl a2,d0 | return value
rts
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