strchr.S - vx32 - Local 9vx git repository for patches.
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       ---
       strchr.S (2326B)
       ---
            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 <asm.h>
           32 
           33 /*
           34  * strchr(s, c)
           35  *        return a pointer to the first occurance of the character c in
           36  *        string s, or NULL if c does not occur in the string.
           37  *
           38  * %edx - pointer iterating through string
           39  * %eax - pointer to first occurance of 'c'
           40  * %cl  - character we're comparing against
           41  * %bl  - character at %edx
           42  *
           43  * Written by:
           44  *        J.T. Conklin (jtc@wimsey.com), Winning Strategies, Inc.
           45  */
           46 
           47 ENTRY(strchr)
           48         pushl        %ebx
           49         movl        8(%esp),%eax
           50         movb        12(%esp),%cl
           51         .align 2,0x90
           52 L1:
           53         movb        (%eax),%bl
           54         cmpb        %bl,%cl                        /* found char??? */
           55         je         L2
           56         incl        %eax
           57         testb        %bl,%bl                        /* null terminator??? */
           58         jne        L1
           59         xorl        %eax,%eax
           60 L2:
           61         popl        %ebx
           62         ret