| 123456789101112131415161718192021222324252627 |
- /* $OpenBSD: memchr.S,v 1.2 2014/11/29 18:51:23 tedu 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
- 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
|
