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22 lines
314 B
ArmAsm

;
; Ullrich von Bassewitz, 02.06.1998
;
; int isalnum (int c);
;
.export _isalnum
.include "ctype.inc"
_isalnum:
cpx #$00 ; Char range ok?
bne @L1 ; Jump if no
tay
lda __ctype,y ; Get character classification
and #CT_ALNUM ; Mask character/digit bits
rts
@L1: lda #$00 ; Return false
tax
rts