;
; Ullrich von Bassewitz, 02.06.1998
;
; int isalpha (int c);
;
.export _isalpha
.include "ctype.inc"
_isalpha:
cpx #$00 ; Char range ok?
bne @L1 ; Jump if no
tay
lda __ctype,y ; Get character classification
and #CT_ALPHA ; Mask character bits
rts
@L1: lda #$00 ; Return false
tax
rts
isalpha.s.html; generated on Sat Oct 13 22:41:32 2001 by ca65html