2000-05-28 13:40:48 +00:00
|
|
|
;
|
|
|
|
|
; Ullrich von Bassewitz, 31.05.1998
|
|
|
|
|
;
|
2017-03-05 01:09:12 +00:00
|
|
|
; Note: strspn & strcspn call internally this function and rely on
|
2018-05-22 13:59:05 +00:00
|
|
|
; the usage of only ptr2 here! Keep in mind when appling changes
|
2017-03-05 01:09:12 +00:00
|
|
|
; and check the other implementations too!
|
|
|
|
|
;
|
2021-05-08 16:23:19 +00:00
|
|
|
; size_t __fastcall__ strlen (const char* s);
|
2000-05-28 13:40:48 +00:00
|
|
|
;
|
|
|
|
|
|
2013-05-09 11:56:54 +00:00
|
|
|
.export _strlen
|
2018-05-22 13:59:05 +00:00
|
|
|
.importzp ptr2
|
2021-05-08 16:23:19 +00:00
|
|
|
.macpack cpu
|
2000-05-28 13:40:48 +00:00
|
|
|
|
|
|
|
|
_strlen:
|
2018-05-22 13:59:05 +00:00
|
|
|
sta ptr2 ; Save s
|
|
|
|
|
stx ptr2+1
|
2021-05-08 16:23:19 +00:00
|
|
|
.if (.cpu .bitand ::CPU_ISET_HUC6280)
|
|
|
|
|
clx
|
|
|
|
|
cly
|
|
|
|
|
.else
|
2013-05-09 11:56:54 +00:00
|
|
|
ldx #0 ; YX used as counter
|
2021-05-08 16:23:19 +00:00
|
|
|
.if (.cpu .bitand ::CPU_ISET_65816)
|
|
|
|
|
txy
|
|
|
|
|
.else
|
2013-05-09 11:56:54 +00:00
|
|
|
ldy #0
|
2021-05-08 16:23:19 +00:00
|
|
|
.endif
|
|
|
|
|
.endif
|
2000-05-28 13:40:48 +00:00
|
|
|
|
2018-05-22 13:59:05 +00:00
|
|
|
L1: lda (ptr2),y
|
2013-05-09 11:56:54 +00:00
|
|
|
beq L9
|
|
|
|
|
iny
|
|
|
|
|
bne L1
|
2018-05-22 13:59:05 +00:00
|
|
|
inc ptr2+1
|
2013-05-09 11:56:54 +00:00
|
|
|
inx
|
|
|
|
|
bne L1
|
2000-05-28 13:40:48 +00:00
|
|
|
|
2013-05-09 11:56:54 +00:00
|
|
|
L9: tya ; get low byte of counter, hi's all set
|
|
|
|
|
rts
|
