1/*
2 * Copyright (c) 1993 Winning Strategies, Inc.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *      This product includes software developed by Winning Strategies, Inc.
16 * 4. The name of the author may not be used to endorse or promote products
17 *    derived from this software without specific prior written permission
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#include <machine/asm.h>
32__FBSDID("$FreeBSD$");
33
34/*
35 * strchr(s, c)
36 *	return a pointer to the first occurrence of the character c in
37 *	string s, or NULL if c does not occur in the string.
38 *
39 * %edx - pointer iterating through string
40 * %eax - pointer to first occurrence of 'c'
41 * %cl  - character we're comparing against
42 * %bl  - character at %edx
43 *
44 * Written by:
45 *	J.T. Conklin (jtc@wimsey.com), Winning Strategies, Inc.
46 */
47
48ENTRY(strchr)
49	pushl	%ebx
50	movl	8(%esp),%eax
51	movb	12(%esp),%cl
52	.align 2,0x90
53L1:
54	movb	(%eax),%bl
55	cmpb	%bl,%cl			/* found char??? */
56	je 	L2
57	incl	%eax
58	testb	%bl,%bl			/* null terminator??? */
59	jne	L1
60	xorl	%eax,%eax
61L2:
62	popl	%ebx
63	ret
64END(strchr)
65
66WEAK_REFERENCE(strchr, index)
67
68	.section .note.GNU-stack,"",%progbits
69