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rindex.S revision 1.1 
      1  1.1  cgd /*
      2  1.1  cgd  * Copyright (c) 1993 Winning Strategies, Inc.
      3  1.1  cgd  * All rights reserved.
      4  1.1  cgd  *
      5  1.1  cgd  * Redistribution and use in source and binary forms, with or without
      6  1.1  cgd  * modification, are permitted provided that the following conditions
      7  1.1  cgd  * are met:
      8  1.1  cgd  * 1. Redistributions of source code must retain the above copyright
      9  1.1  cgd  *    notice, this list of conditions and the following disclaimer.
     10  1.1  cgd  * 2. Redistributions in binary form must reproduce the above copyright
     11  1.1  cgd  *    notice, this list of conditions and the following disclaimer in the
     12  1.1  cgd  *    documentation and/or other materials provided with the distribution.
     13  1.1  cgd  * 3. All advertising materials mentioning features or use of this software
     14  1.1  cgd  *    must display the following acknowledgement:
     15  1.1  cgd  *      This product includes software developed by Winning Strategies, Inc.
     16  1.1  cgd  * 4. The name of the author may not be used to endorse or promote products
     17  1.1  cgd  *    derived from this software withough specific prior written permission
     18  1.1  cgd  *
     19  1.1  cgd  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     20  1.1  cgd  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     21  1.1  cgd  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     22  1.1  cgd  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     23  1.1  cgd  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     24  1.1  cgd  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  1.1  cgd  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  1.1  cgd  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  1.1  cgd  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     28  1.1  cgd  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  1.1  cgd  *
     30  1.1  cgd  *	$Id: rindex.S,v 1.1 1993/10/07 00:19:30 cgd Exp $
     31  1.1  cgd  */
     32  1.1  cgd 
     33  1.1  cgd #if defined(LIBC_RCS) && !defined(lint)
     34  1.1  cgd 	.text
     35  1.1  cgd 	.asciz "$Id: rindex.S,v 1.1 1993/10/07 00:19:30 cgd Exp $"
     36  1.1  cgd #endif /* LIBC_RCS and not lint */
     37  1.1  cgd 
     38  1.1  cgd #include "DEFS.h"
     39  1.1  cgd 
     40  1.1  cgd /*
     41  1.1  cgd  * rindex(s, c)
     42  1.1  cgd  *	return a pointer to the last occurance of the character c in
     43  1.1  cgd  *	string s, or NULL if c does not occur in the string.
     44  1.1  cgd  *
     45  1.1  cgd  * %edx - pointer iterating through string
     46  1.1  cgd  * %eax - pointer to last occurance of 'c'
     47  1.1  cgd  * %cl  - character we're comparing against
     48  1.1  cgd  * %bl  - character at %edx
     49  1.1  cgd  *
     50  1.1  cgd  * Written by:
     51  1.1  cgd  *	J.T. Conklin (jtc (at) wimsey.com), Winning Strategies, Inc.
     52  1.1  cgd  */
     53  1.1  cgd 
     54  1.1  cgd ENTRY(rindex)
     55  1.1  cgd 	pushl	%ebx
     56  1.1  cgd 	movl	8(%esp),%edx
     57  1.1  cgd 	movb	12(%esp),%cl
     58  1.1  cgd 	xorl	%eax,%eax		/* init pointer to null */
     59  1.1  cgd 	.align 2,0x90
     60  1.1  cgd L1:
     61  1.1  cgd 	movb	(%edx),%bl
     62  1.1  cgd 	cmpb	%bl,%cl
     63  1.1  cgd 	jne	L2
     64  1.1  cgd 	movl	%edx,%eax
     65  1.1  cgd L2:
     66  1.1  cgd 	incl	%edx
     67  1.1  cgd 	testb	%bl,%bl			/* null terminator??? */
     68  1.1  cgd 	jne	L1
     69  1.1  cgd 	popl	%ebx
     70  1.1  cgd 	ret
     71