;
.export _strspn
- .import popax, _strlen
+ .import popptr1, _strlen
.importzp ptr1, ptr2, tmp1, tmp2
_strspn:
- jsr _strlen ; get length in a/x and transfer s2 to ptr1
+ jsr _strlen ; get length in a/x and transfer s2 to ptr2
; Note: It does not make sense to
; have more than 255 test chars, so
- ; we don't support a high byte here! (ptr1+1 is
+ ; we don't support a high byte here! (ptr2+1 is
; also unchanged in strlen then (important!))
; -> the original implementation also
; ignored this case
sta tmp1 ; tmp1 = strlen of test chars
- jsr popax ; get and save s1
- sta ptr2 ; to ptr2
- stx ptr2+1
+ jsr popptr1 ; get and save s1 to ptr1
+
ldx #0 ; low counter byte
stx tmp2 ; high counter byte
loadChar:
ldy #0
- lda (ptr2),y ; get next char from s1
+ lda (ptr1),y ; get next char from s1
beq leave ; handly byte of s1
advance:
- inc ptr2 ; advance string position to test
+ inc ptr1 ; advance string position to test
bne check
- inc ptr2+1
+ inc ptr1+1
dey ; correct next iny (faster/shorter than bne...)
checkNext:
iny
check: cpy tmp1 ; compare with length of test character string
beq leave
- cmp (ptr1),y ; found matching char?
+ cmp (ptr2),y ; found matching char?
bne checkNext
foundTestChar: