/*

 * 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.

 */

/

/ Wide character wcsncpy() implementation

/

/ Algorithm based on Solaris 2.6 gen/strncpy.s implementation

/

#include <sys/asm_linkage.h>

	ANSI_PRAGMA_WEAK(wcsncmp,function)

	ANSI_PRAGMA_WEAK(wsncmp,function)

	ENTRY(wcsncmp)		/* (wchar *ws1, wchar_t *ws2, size_t n) */

	cmpq	%rdi,%rsi	/ same string?

	je	.equal

	incq	%rdx		/ will later predecrement this uint

.loop:

	decq	%rdx

	je	.equal		/ Used all n chars?

	movl	(%rdi),%eax	/ slodb ; scab

	cmpl	(%rsi),%eax

	jne	.notequal_0	/ Are the bytes equal?

	testl	%eax,%eax

	je	.equal		/ End of string?

	decq	%rdx

	je	.equal		/ Used all n chars?

	movl	4(%rdi),%eax	/ slodb ; scab

	cmpl	4(%rsi),%eax

	jne	.notequal_1	/ Are the bytes equal?

	testl	%eax,%eax

	je	.equal		/ End of string?

	decq	%rdx

	je	.equal		/ Used all n chars?

	movl	8(%rdi),%eax	/ slodb ; scab

	cmpl	8(%rsi),%eax

	jne	.notequal_2	/ Are the bytes equal?

	testl	%eax,%eax

	je	.equal		/ End of string?

	decq	%rdx

	je	.equal		/ Used all n chars?

	movl	12(%rdi),%eax	/ slodb ; scab

	cmpl	12(%rsi),%eax

	jne	.notequal_3	/ Are the bytes equal?

	addq	$16,%rdi

	addq	$16,%rsi

	testl	%eax,%eax

	jne	.loop		/ End of string?

.equal:

	xorl	%eax,%eax	/ return 0

	ret

	.align	4

.notequal_3:

	addq	$4,%rsi

.notequal_2:

	addq	$4,%rsi

.notequal_1:

	addq	$4,%rsi

.notequal_0:

	subl	(%rsi),%eax	/ return value is (*s1 - *--s2)

	ret

	SET_SIZE(wcsncmp)

	ENTRY(wsncmp)

	jmp	wcsncmp		/ tail call into wcsncmp

	SET_SIZE(wsncmp)