strrchr.S revision 229571 
113547Sjulian/*
213547Sjulian * Copyright (c) 1993 Winning Strategies, Inc.
313547Sjulian * All rights reserved.
413547Sjulian *
513547Sjulian * Redistribution and use in source and binary forms, with or without
613547Sjulian * modification, are permitted provided that the following conditions
713547Sjulian * are met:
813547Sjulian * 1. Redistributions of source code must retain the above copyright
913547Sjulian *    notice, this list of conditions and the following disclaimer.
1013547Sjulian * 2. Redistributions in binary form must reproduce the above copyright
1113547Sjulian *    notice, this list of conditions and the following disclaimer in the
1213547Sjulian *    documentation and/or other materials provided with the distribution.
1313547Sjulian * 3. All advertising materials mentioning features or use of this software
1413547Sjulian *    must display the following acknowledgement:
1513547Sjulian *      This product includes software developed by Winning Strategies, Inc.
1613547Sjulian * 4. The name of the author may not be used to endorse or promote products
1713547Sjulian *    derived from this software without specific prior written permission
1813547Sjulian *
1913547Sjulian * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
2013547Sjulian * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
2113547Sjulian * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
2213547Sjulian * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
2313547Sjulian * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
2413547Sjulian * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
2513547Sjulian * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
2613547Sjulian * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
2713547Sjulian * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
2813547Sjulian * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
2913547Sjulian */
3013547Sjulian
3113547Sjulian#include <machine/asm.h>
3250473Speter__FBSDID("$FreeBSD: head/lib/libc/i386/string/strrchr.S 229571 2012-01-05 10:32:53Z ed $");
3313547Sjulian
3413547Sjulian/*
3513547Sjulian * strrchr(s, c)
3613547Sjulian *	return a pointer to the last occurance of the character c in
3713547Sjulian *	string s, or NULL if c does not occur in the string.
3813547Sjulian *
3913547Sjulian * %edx - pointer iterating through string
4013547Sjulian * %eax - pointer to last occurance of 'c'
4113547Sjulian * %cl  - character we're comparing against
4213547Sjulian * %bl  - character at %edx
4313547Sjulian *
4413547Sjulian * Written by:
4513547Sjulian *	J.T. Conklin (jtc@wimsey.com), Winning Strategies, Inc.
46 */
47
48ENTRY(strrchr)
49	pushl	%ebx
50	movl	8(%esp),%edx
51	movb	12(%esp),%cl
52	xorl	%eax,%eax		/* init pointer to null */
53	.align 2,0x90
54L1:
55	movb	(%edx),%bl
56	cmpb	%bl,%cl
57	jne	L2
58	movl	%edx,%eax
59L2:
60	incl	%edx
61	testb	%bl,%bl			/* null terminator??? */
62	jne	L1
63	popl	%ebx
64	ret
65END(strrchr)
66
67WEAK_ALIAS(rindex, strrchr)
68
69	.section .note.GNU-stack,"",%progbits
70