| The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame^] | 1 | /* $OpenBSD: memchr.S,v 1.3 2005/08/07 11:30:38 espie Exp $ */ |
| 2 | /* |
| 3 | * Written by J.T. Conklin <jtc@netbsd.org>. |
| 4 | * Public domain. |
| 5 | */ |
| 6 | |
| 7 | #include <machine/asm.h> |
| 8 | |
| 9 | ENTRY(memchr) |
| 10 | pushl %edi |
| 11 | movl 8(%esp),%edi /* string address */ |
| 12 | movl 12(%esp),%eax /* set character to search for */ |
| 13 | movl 16(%esp),%ecx /* set length of search */ |
| 14 | testl %ecx,%ecx /* test for len == 0 */ |
| 15 | jz L1 |
| 16 | cld /* set search forward */ |
| 17 | repne /* search! */ |
| 18 | scasb |
| 19 | jne L1 /* scan failed, return null */ |
| 20 | leal -1(%edi),%eax /* adjust result of scan */ |
| 21 | popl %edi |
| 22 | ret |
| 23 | .align 2,0x90 |
| 24 | L1: xorl %eax,%eax |
| 25 | popl %edi |
| 26 | ret |