wcslen.S revision 184548 
1254721Semaste/*-
2254721Semaste * Copyright (c) 2003 Tim J. Robbins.
3254721Semaste * All rights reserved.
4254721Semaste *
5254721Semaste * Redistribution and use in source and binary forms, with or without
6254721Semaste * modification, are permitted provided that the following conditions
7254721Semaste * are met:
8254721Semaste * 1. Redistributions of source code must retain the above copyright
9254721Semaste *    notice, this list of conditions and the following disclaimer.
10254721Semaste * 2. Redistributions in binary form must reproduce the above copyright
11254721Semaste *    notice, this list of conditions and the following disclaimer in the
12254721Semaste *    documentation and/or other materials provided with the distribution.
13254721Semaste *
14254721Semaste * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15254721Semaste * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16254721Semaste * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17254721Semaste * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18254721Semaste * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19254721Semaste * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20254721Semaste * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <machine/asm.h>
28__FBSDID("$FreeBSD: head/lib/libc/i386/string/wcslen.S 184548 2008-11-02 01:28:47Z peter $");
29
30/*
31 * size_t
32 * wcslen(const wchar_t *s) --
33 *	Find the length of a wide character string.
34 */
35ENTRY(wcslen)
36	movl	4(%esp),%ecx		/* String */
37	pushl	%ebx
38	xorl	%ebx,%ebx
39	xorl	%eax,%eax
40.p2align 4,0x90
41L1:	cmpl	%ebx,(%ecx)
42	jz	found0
43	cmpl	%ebx,4(%ecx)
44	jz	found1
45	cmpl	%ebx,8(%ecx)
46	jz	found2
47	cmpl	%ebx,12(%ecx)
48	jz	found3
49	cmpl	%ebx,16(%ecx)
50	jz	found4
51	cmpl	%ebx,20(%ecx)
52	jz	found5
53	cmpl	%ebx,24(%ecx)
54	jz	found6
55	cmpl	%ebx,28(%ecx)
56	jz	found7
57	leal	32(%ecx),%ecx
58	addl	$8,%eax
59	jmp	L1
60found7:	incl	%eax
61found6:	incl	%eax
62found5:	incl	%eax
63found4:	incl	%eax
64found3:	incl	%eax
65found2:	incl	%eax
66found1:	incl	%eax
67found0:	popl	%ebx
68	ret
69END(wcslen)
70