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22 lines
315 B
ArmAsm

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