57 lines
1.9 KiB
ArmAsm
57 lines
1.9 KiB
ArmAsm
/*
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* Copyright (c) 1993 Winning Strategies, Inc.
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* All Rights Reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "DEFS.h"
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/*
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* strchr(s, c)
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* return a pointer to the first occurance of the character c in
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* string s, or NULL if c does not occur in the string.
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*
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* %edx - pointer iterating through string
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* %eax - pointer to first occurance of 'c'
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* %cl - character we're comparing against
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* %bl - character at %edx
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*
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* jtc@wimsey.com (J.T. Conklin, Winning Strategies, Inc.)
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*/
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ENTRY(strchr)
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pushl %ebx
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movl 8(%esp),%eax
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movb 12(%esp),%cl
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.align 2,0x90
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L1:
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movb (%eax),%bl
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cmpb %bl,%cl /* found char??? */
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je L2
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incl %eax
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testb %bl,%bl /* null terminator??? */
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jne L1
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xorl %eax,%eax
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L2:
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popl %ebx
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ret
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