cc65/libsrc/common/isalnum.s

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;
; Ullrich von Bassewitz, 02.06.1998
;
; int isalnum (int c);
;
.export _isalnum
.import __ctype
_isalnum:
tay
lda __ctype,y ; Get character classification
and #$07 ; Mask character/digit bits
rts