wsncmp.s revision 7257d1b4d25bfac0c802847390e98a464fd787ac
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2008 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
.file "%M%"
/
/ Wide character wcsncpy() implementation
/
/ Algorithm based on Solaris 2.6 gen/strncpy.s implementation
/
#include "SYS.h"
ANSI_PRAGMA_WEAK(wcsncmp,function)
ANSI_PRAGMA_WEAK(wsncmp,function)
ENTRY(wcsncmp)
pushl %esi / save register variables
movl 8(%esp),%esi / %esi = first string
movl %edi,%edx
movl 12(%esp),%edi / %edi = second string
cmpl %esi,%edi / same string?
je .equal
movl 16(%esp),%ecx / %ecx = length
incl %ecx / will later predecrement this uint
.loop:
decl %ecx
je .equal / Used all n chars?
movl (%esi),%eax / slodb ; scab
cmpl (%edi),%eax
jne .notequal_0 / Are the bytes equal?
testl %eax,%eax
je .equal / End of string?
decl %ecx
je .equal / Used all n chars?
movl 4(%esi),%eax / slodb ; scab
cmpl 4(%edi),%eax
jne .notequal_1 / Are the bytes equal?
testl %eax,%eax
je .equal / End of string?
decl %ecx
je .equal / Used all n chars?
movl 8(%esi),%eax / slodb ; scab
cmpl 8(%edi),%eax
jne .notequal_2 / Are the bytes equal?
testl %eax,%eax
je .equal / End of string?
decl %ecx
je .equal / Used all n chars?
movl 12(%esi),%eax / slodb ; scab
cmpl 12(%edi),%eax
jne .notequal_3 / Are the bytes equal?
addl $16,%esi
addl $16,%edi
testl %eax,%eax
jne .loop / End of string?
.equal:
popl %esi / restore registers
xorl %eax,%eax / return 0
movl %edx,%edi
ret
.align 4
.notequal_3:
addl $4,%edi
.notequal_2:
addl $4,%edi
.notequal_1:
addl $4,%edi
.notequal_0:
popl %esi / restore registers
subl (%edi),%eax / return value is (*s1 - *--s2)
movl %edx,%edi
ret
SET_SIZE(wcsncmp)
ENTRY(wsncmp)
_prologue_
movl _esp_(12),%ecx
movl _esp_(8),%eax
movl _esp_(4),%edx
pushl %ecx
pushl %eax
pushl %edx
call _fref_(wcsncmp)
addl $12,%esp
_epilogue_
ret
SET_SIZE(wsncmp)