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/* $OpenBSD: str.s,v 1.2 1997/05/29 00:04:28 niklas Exp $ */
/* $NetBSD: str.s,v 1.2 1996/08/02 16:18:40 ragge Exp $ */
/*
* Copyright (c) 1996 Ludd, University of Lule}, Sweden.
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed at Ludd, University of
* Lule}, Sweden and its contributors.
* 4. 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 BY THE AUTHOR ``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.
*/
/*
* Small versions of the most common string functions not using any
* emulated instructions.
*/
#include "../include/asm.h"
ENTRY(strlen, 0);
movl 4(ap), r0
1: tstb (r0)+
bneq 1b
decl r0
subl2 4(ap), r0
ret
ENTRY(strncmp, 0)
movl 12(ap), r3
brb 5f
ENTRY(strcmp, 0)
movl $250, r3 # max string len to compare
5: movl 4(ap), r2
movl 8(ap), r1
movl $1, r0
2: cmpb (r2),(r1)+
bneq 1f # something differ
tstb (r2)+
beql 4f # continue, strings unequal
decl r3 # max string len encountered?
bneq 2b
4: clrl r0 # We are done, strings equal.
ret
1: bgtr 3f
mnegl r0, r0
3: ret
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