;
.export _iscntrl
- .import __ctype
+ .include "ctype.inc"
_iscntrl:
+ cpx #$00 ; Char range ok?
+ bne @L1 ; Jump if no
tay
lda __ctype,y ; Get character classification
- and #$10 ; Mask control character bit
+ and #CT_CTRL ; Mask control character bit
rts
+@L1: lda #$00 ; Return false
+ tax
+ rts