| 26 |
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 27 |
POSSIBILITY OF SUCH DAMAGE. */ |
POSSIBILITY OF SUCH DAMAGE. */ |
| 28 |
|
|
| 29 |
|
/* $Id$ */ |
| 30 |
|
|
| 31 |
#include "macros.inc" |
#include "macros.inc" |
| 32 |
|
|
| 33 |
#define src_hi r25 |
#define src_hi r25 |
| 51 |
.global _U(strlen) |
.global _U(strlen) |
| 52 |
.type _U(strlen), @function |
.type _U(strlen), @function |
| 53 |
_U(strlen): |
_U(strlen): |
| 54 |
LOAD_Z(src_lo, src_hi) |
X_movw ZL, src_lo |
| 55 |
.strlen_loop: |
.L_strlen_loop: |
| 56 |
ld __tmp_reg__, Z+ |
ld __tmp_reg__, Z+ |
| 57 |
tst __tmp_reg__ |
tst __tmp_reg__ |
| 58 |
brne .strlen_loop |
brne .L_strlen_loop |
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; Z points one character past the terminating NUL |
; Z points one character past the terminating NUL |
| 60 |
; return Z - 1 - src = (-1 - src) + Z = ~src + Z |
; return Z - 1 - src = (-1 - src) + Z = ~src + Z |
| 61 |
com src_lo |
com src_lo |
| 63 |
add src_lo, ZL |
add src_lo, ZL |
| 64 |
adc src_hi, ZH |
adc src_hi, ZH |
| 65 |
ret |
ret |
| 66 |
.strlen_end: |
.L_strlen_end: |
| 67 |
.size _U(strlen), .strlen_end - _U(strlen) |
.size _U(strlen), .L_strlen_end - _U(strlen) |
| 68 |
|
|
| 69 |
#endif /* not DOXYGEN */ |
#endif /* not DOXYGEN */ |