cc65/libsrc/atari/dio_stc.s

;
; Christian Groessler, October 2000
;
; this file provides the _dio_log_to_phys function
; (previously called _dio_snum_to_chs, so the filename)
;
; on the Atari this function is a dummy, it returns
; cylinder and head 0 and as sector the sectnum it got
;
; unsigned char __fastcall__ dio_log_to_phys(dhandle_t handle,
;					     unsigned *sectnum,		/* input */
;					     dio_phys_pos *physpos);	/* output */
;
; dhandle_t - 16bit (ptr)
;

	.export		_dio_log_to_phys
	.include	"atari.inc"
	.importzp	ptr1,ptr2,ptr3
	.import		popax,__oserror

.proc	_dio_log_to_phys

	sta	ptr2
	stx	ptr2+1		; pointer to output structure

	jsr	popax
	sta	ptr1
	stx	ptr1+1		; save pointer to input data

	jsr	popax
	sta	ptr3
	stx	ptr3+1		; pointer to handle

	ldy	#sst_flag
	lda	(ptr3),y
	and	#128
	beq	_inv_hand	; handle not open or invalid

	lda	#0
	tay
	tax
	sta	(ptr2),y	; head
	iny
	sta	(ptr2),y	; track (low)
	iny
	sta	(ptr2),y	; track (high)
	iny

	lda	(ptr1,x)
	sta	(ptr2),y
	iny
	inc	ptr1
	bne	_l1
	inc	ptr1+1
_l1:	lda	(ptr1,x)
	sta	(ptr2),y

	txa
ret:
	sta	__oserror
	rts			; return success

; invalid handle

_inv_hand:
	ldx	#0
	lda	#BADIOC
	bne	ret

.endproc