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cc65/libsrc/common/iscntrl.s

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;
; Ullrich von Bassewitz, 02.06.1998
;
; int iscntrl (int c);
;
.export _iscntrl
.import __ctype
_iscntrl:
tay
lda __ctype,y ; Get character classification
and #$10 ; Mask control character bit
rts