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cc65/libsrc/common/isdigit.s

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