| The Android Open Source Project | a27d2ba | 2008-10-21 07:00:00 -0700 | [diff] [blame^] | 1 | /* $OpenBSD: strlen.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(strlen) |
| 10 | pushl %edi |
| 11 | movl 8(%esp),%edi /* string address */ |
| 12 | cld /* set search forward */ |
| 13 | xorl %eax,%eax /* set search for null terminator */ |
| 14 | movl $-1,%ecx /* set search for lots of characters */ |
| 15 | repne /* search! */ |
| 16 | scasb |
| 17 | notl %ecx /* get length by taking complement */ |
| 18 | leal -1(%ecx),%eax /* and subtracting one */ |
| 19 | popl %edi |
| 20 | ret |