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cc65/libsrc/atmos/cvline.s

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;
; Ullrich von Bassewitz, 2003-04-13
;
; void cvlinexy (unsigned char x, unsigned char y, unsigned char length);
; void cvline (unsigned char length);
;
.export _cvlinexy, _cvline
.import setscrptr
.import rvs
.import popax
.importzp ptr2
.include "atmos.inc"
_cvlinexy:
pha ; Save the length
jsr popax ; Get X and Y
sta CURS_Y ; Store Y
stx CURS_X ; Store X
pla ; Restore the length and run into _cvline
_cvline:
tax ; Is the length zero?
beq @L9 ; Jump if done
@L1: jsr setscrptr ; Set ptr2 to screen, won't use X
lda #'|'
ora rvs
sta (ptr2),y ; Write one char
inc CURS_Y
@L2: dex
bne @L1
@L9: rts