1 /***************************************************************************
3 * Open \______ \ ____ ____ | | _\_ |__ _______ ___
4 * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
5 * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
6 * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
10 * Copyright (C) 2007 Nils Wallménius
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version 2
15 * of the License, or (at your option) any later version.
17 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
18 * KIND, either express or implied.
20 ****************************************************************************/
22 /* size_t strlen(const char *str) */
24 .section .text,"ax",@progbits
27 .type strlen, @function
30 move.l 4(%sp),%a0 /* %a0 = *str */
31 move.l %a0,%d0 /* %d0 = start address */
34 tst.b (%a0)+ /* test if %a0 == 0 and increment */
35 bne.b 1b /* if the test was false repeat */
37 sub.l %d0,%a0 /* how many times did we repeat? */
39 subq.l #1,%d0 /* %d0 is 1 too large due to the last increment */
41 .size strlen, .-strlen