cc65/libsrc/osic1p/cclear.s

;
; 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
Added cclear() and cclearxy() implementations. 2014-11-30 13:25:16 +00:00			`;`
			`; 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`
Introduced internal gotoxy that pops both parameters. About all CONIO functions offering a <...>xy variant call popa _gotoxy By providing an internal gotoxy variant that starts with a popa all those CONIO function can be shortened by 3 bytes. As soon as program calls more than one CONIO function this means an overall code size reduction. 2016-06-05 12:58:38 +00:00			`.import gotoxy, cputdirect`
Added cclear() and cclearxy() implementations. 2014-11-30 13:25:16 +00:00			`.importzp tmp1`

			`_cclearxy:`
			`pha ; Save the length`
Introduced internal gotoxy that pops both parameters. About all CONIO functions offering a <...>xy variant call popa _gotoxy By providing an internal gotoxy variant that starts with a popa all those CONIO function can be shortened by 3 bytes. As soon as program calls more than one CONIO function this means an overall code size reduction. 2016-06-05 12:58:38 +00:00			`jsr gotoxy ; Call this one, will pop params`
Added cclear() and cclearxy() implementations. 2014-11-30 13:25:16 +00:00			`pla ; Restore the length and run into _cclear`

			`_cclear:`
			`cmp #0 ; Is the length zero?`
			`beq L9 ; Jump if done`
remove dangling spaces 2022-04-17 14:06:22 +00:00			`sta tmp1`
Use character constants where appropriate. 2015-02-21 19:53:16 +00:00			`L1: lda #' '`
Added cclear() and cclearxy() implementations. 2014-11-30 13:25:16 +00:00			`jsr cputdirect ; Direct output`
			`dec tmp1`
			`bne L1`
			`L9: rts`