blob: 367c7b481eeac9104fb3ec3b9a1693c2ba1a4cd0 [file] [log] [blame]
/* $OpenBSD: memchr.S,v 1.3 2005/08/07 11:30:38 espie Exp $ */
/*
* Written by J.T. Conklin <jtc@netbsd.org>.
* Public domain.
*/
#include <machine/asm.h>
ENTRY(memchr)
pushl %edi
movl 8(%esp),%edi /* string address */
movl 12(%esp),%eax /* set character to search for */
movl 16(%esp),%ecx /* set length of search */
testl %ecx,%ecx /* test for len == 0 */
jz L1
cld /* set search forward */
repne /* search! */
scasb
jne L1 /* scan failed, return null */
leal -1(%edi),%eax /* adjust result of scan */
popl %edi
ret
.align 2,0x90
L1: xorl %eax,%eax
popl %edi
ret
END(memchr)