1*ea6088e7Sguenther/* $OpenBSD: memchr.S,v 1.6 2017/11/29 05:13:57 guenther Exp $ */ 2df930be7Sderaadt/* 3df930be7Sderaadt * Written by J.T. Conklin <jtc@netbsd.org>. 4df930be7Sderaadt * Public domain. 5df930be7Sderaadt */ 6df930be7Sderaadt 7*ea6088e7Sguenther#include "DEFS.h" 8df930be7Sderaadt 9df930be7SderaadtENTRY(memchr) 10df930be7Sderaadt pushl %edi 11df930be7Sderaadt movl 8(%esp),%edi /* string address */ 12df930be7Sderaadt movl 12(%esp),%eax /* set character to search for */ 13df930be7Sderaadt movl 16(%esp),%ecx /* set length of search */ 14df930be7Sderaadt testl %ecx,%ecx /* test for len == 0 */ 15df930be7Sderaadt jz L1 16df930be7Sderaadt cld /* set search forward */ 17df930be7Sderaadt repne /* search! */ 18df930be7Sderaadt scasb 19df930be7Sderaadt jne L1 /* scan failed, return null */ 20df930be7Sderaadt leal -1(%edi),%eax /* adjust result of scan */ 21df930be7Sderaadt popl %edi 22df930be7Sderaadt ret 233308d86bSderaadt .align 2,0xcc 24df930be7SderaadtL1: xorl %eax,%eax 25df930be7Sderaadt popl %edi 26df930be7Sderaadt ret 279b9d2a55SguentherEND_STRONG(memchr) 28