code size optimization

src/dos_m65/dos_acptr.s

@@ -0,0 +1,85 @@
+
+;
+; Implementation of ACPTR command. For detailed description see 'm65dos_bridge.s' file.
+;
+
+
+dos_ACPTR: ; does not have to preserve .X
+
+	ldx IDX1_TALKER
+	bmi dos_ACPTR_fail
+
+	lda XX_CHANNEL, X
+	cmp #$0F
+	beq dos_ACPTR_status
+
+	; XXX providde implementation for non-status streams
+
+	jmp dos_ACPTR_fail
+
+dos_ACPTR_status:
+
+	ldx IDX2_TALKER
+	jsr (dos_ACPTR_getsts_table, X)
+	sta TBTCNT                         ; byte return
+	beq dos_ACPTR_reset_status
+
+	; XXX
+
+	clc
+	rts
+
+dos_ACPTR_fail:
+
+	; XXX set error code
+
+	sec
+	rts
+
+dos_ACPTR_reset_status:
+
+	; XXX replace status with OK instead
+
+	ldx IDX1_TALKER
+	lda #$00
+	sta XX_STATUS_IDX,x
+
+	; FALLTROUGH
+
+dos_ACPTR_eoi:
+
+	jsr kernalstatus_EOI
+	
+	clc
+	rts
+
+
+
+; Retrieving bytes from the status string
+
+dos_ACPTR_getsts_SD:                   ; get next byte of status - SD card
+
+	ldx SD_STATUS_IDX
+	inc SD_STATUS_IDX
+	lda SD_STATUS_STR,x
+	rts
+
+dos_ACPTR_getsts_FD:                   ; get next byte of status - floppy
+
+	ldx FD_STATUS_IDX
+	inc FD_STATUS_IDX
+	lda FD_STATUS_STR,x
+	rts
+
+dos_ACPTR_getsts_RD:                   ; get next byte of status - ram disk
+
+	ldx RD_STATUS_IDX
+	inc RD_STATUS_IDX
+	lda RD_STATUS_STR,x
+	rts
+
+dos_ACPTR_getsts_table:
+
+	!word dos_ACPTR_getsts_SD
+	!word dos_ACPTR_getsts_FD
+	!word dos_ACPTR_getsts_RD