cc65/libsrc/osic1p/cclear.s

29 lines
776 B
ArmAsm

;
; Copied from CBM implementation
;
; originally by:
; Ullrich von Bassewitz, 08.08.1998
;
; void cclearxy (unsigned char x, unsigned char y, unsigned char length);
; void cclear (unsigned char length);
;
.export _cclearxy, _cclear
.import gotoxy, cputdirect
.importzp tmp1
_cclearxy:
pha ; Save the length
jsr gotoxy ; Call this one, will pop params
pla ; Restore the length and run into _cclear
_cclear:
cmp #0 ; Is the length zero?
beq L9 ; Jump if done
sta tmp1
L1: lda #' '
jsr cputdirect ; Direct output
dec tmp1
bne L1
L9: rts