/*      $OpenBSD: memchr.S,v 1.6 2017/11/29 05:13:57 guenther Exp $ */
/*
 * Written by J.T. Conklin <jtc@netbsd.org>.
 * Public domain.
 */

#include "DEFS.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 2,0xcc
L1:     xorl    %eax,%eax
        popl    %edi
        ret
END_STRONG(memchr)