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rindex.S revision 1.1 
      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 withough 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  *	$Id: rindex.S,v 1.1 1993/10/07 00:19:30 cgd Exp $
     31  */
     32 
     33 #if defined(LIBC_RCS) && !defined(lint)
     34 	.text
     35 	.asciz "$Id: rindex.S,v 1.1 1993/10/07 00:19:30 cgd Exp $"
     36 #endif /* LIBC_RCS and not lint */
     37 
     38 #include "DEFS.h"
     39 
     40 /*
     41  * rindex(s, c)
     42  *	return a pointer to the last occurance of the character c in
     43  *	string s, or NULL if c does not occur in the string.
     44  *
     45  * %edx - pointer iterating through string
     46  * %eax - pointer to last occurance of 'c'
     47  * %cl  - character we're comparing against
     48  * %bl  - character at %edx
     49  *
     50  * Written by:
     51  *	J.T. Conklin (jtc (at) wimsey.com), Winning Strategies, Inc.
     52  */
     53 
     54 ENTRY(rindex)
     55 	pushl	%ebx
     56 	movl	8(%esp),%edx
     57 	movb	12(%esp),%cl
     58 	xorl	%eax,%eax		/* init pointer to null */
     59 	.align 2,0x90
     60 L1:
     61 	movb	(%edx),%bl
     62 	cmpb	%bl,%cl
     63 	jne	L2
     64 	movl	%edx,%eax
     65 L2:
     66 	incl	%edx
     67 	testb	%bl,%bl			/* null terminator??? */
     68 	jne	L1
     69 	popl	%ebx
     70 	ret
     71