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cpm/pcpm/XSUB1.ASM

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+;       xsub  'Extended Submit Facility'  version 2.2
+;
+;
+;
+;	xsub loads below ccp, and feeds command lines to
+;	programs which read buffered input
+;
+bias	equ	0000h	;bias for relocation
+base	equ	0ffffh	;no intercepts below here
+wboot	equ	0000h
+bdos	equ	0005h
+bdosl	equ	bdos+1
+dbuff	equ	0080h
+;
+cr	equ	0dh	;carriage return
+lf	equ	0ah	;line feed
+modnum	equ	14	;module number position
+pbuff	equ	9	;print buffer
+rbuff	equ	10	;read buffer
+openf	equ	15	;open file
+closef	equ	16	;close file
+delf	equ	19	;delete file
+dreadf	equ	20	;disk read
+dmaf	equ	26	;set dma function
+;
+;
+	org	0000h+bias
+;	initialize jmps to include xsub module
+	jmp	start
+	ds	3
+trapjmp:
+	jmp	trap
+	db	'xsub'
+start:
+	lhld	wboot+1
+	shld	savboot
+	lxi	h,wstart
+	shld	wboot+1
+	lhld	bdosl
+	shld	rbdos+1	;real bdos entry
+	lxi	h,trapjmp	;address to fill
+	shld	bdosl	;jmp @0005 leads to trap
+	pop	h	;ccp return address
+	shld	ccpret
+	pchl		;back to ccp
+;
+savboot:
+	ds	2	;warm boot saved and restored at end
+			;of submit file
+;
+wstart:
+	lxi	sp,stack
+	mvi	c,pbuff	;print message
+	CALL	GET$SUBADDR
+	lxi	d,actmsg
+<EFBFBD>	CNZ	rbdos
+	lxi	h,dbuff	;restore default buffer
+	shld	udma
+	call	rsetdma
+	lxi	h,trapjmp
+	shld	bdosl	;fixup low jump address
+	lhld	ccpret	;back to ccp
+	pchl
+
+actmsg:	db	cr,lf,'(xsub active)$'
+;
+trap:	;arrive here at each bdos call
+	pop	h	;return address
+	push	h	;back to stack
+	mov	a,h	;high address
+	cpi	base shr 8
+	jnc	rbdos	;skip calls on bdos above here
+	mov	a,c	;function number
+	cpi	rbuff
+	jz	rnbuff	;read next buffer
+	cpi	dmaf	;set dma address?
+	jnz	rbdos	;skip if not
+	xchg		;dma to hl
+	shld	udma	;save it
+	xchg
+rbdos:	jmp	0000h	;filled in at initialization
+;
+setdma:
+	lxi	d,combuf
+SETDMA1:
+	mvi	c,dmaf
+	JMP	RBDOS
+;
+rsetdma:
+	lhld	udma
+	xchg
+	JMP	SETDMA1
+;
+GET$SUBADDR:
+	LHLD	RBDOS+1
+	MVI	L,09H
+	MOV	E,M
+	INX	H
+	MOV	D,M
+	XCHG
+	MOV	A,M
+	ORA	A
+	RET
+;
+DELETE$SUB:
+	CALL 	GET$SUBADDR
+	MVI	M,0
+	MVI	C,DELF
+	LXI	D,SUBFCB
+;
+<EFBFBD>fbdos:
+	push	b
+	push	d
+	call	setdma
+	pop	d
+	pop	b
+	call	rbdos
+	push	psw
+	call	rsetdma
+	pop	psw
+	ret
+;
+cksub:	;check for sub file present
+	CALL	GET$SUBADDR
+	RZ
+	INX	H
+	LXI	D,SUBS1
+	MVI	C,20
+;
+MOVE:
+	INR	C
+MOVE1:
+	ORA	C
+	DCR	C
+	RZ
+	MOV	A,M
+	STAX	D
+	INX	H
+	INX	D
+	JMP	MOVE1
+;
+rnbuff:
+	push	d	;command address
+	call	cksub	;sub file present?
+	pop	d
+	mvi	c,rbuff
+	ORA	A
+	jz	restor	;no sub file 
+;
+	push	d
+	lda	subrc	;length of file
+	ora	a	;zero?
+	jz	rbdos	;skip if so
+	dcr	a	;length - 1
+	sta	subcr	;next to read
+	mvi	c,dreadf
+	lxi	d,subfcb
+	call	fbdos	;read record
+	ORA	A
+	JZ	READOK
+
+	CALL	DELETE$SUB
+	MVI	C,0
+restor:
+	lhld	savboot
+<EFBFBD>	shld	wboot+1
+	jmp	rbdos
+
+READOK:
+;	now print the buffer with cr,lf
+
+	lxi	h,combuf
+	mov	e,m	;length
+	mvi	d,0	;high order 00
+	dad	d	;to last character position
+	inx	h
+	mvi	m,cr
+	inx	h
+	mvi	m,lf
+	inx	h
+	mvi	m,'$'
+	mvi	c,pbuff
+	lxi	d,combuf+1
+	LDAX	D
+	CPI	3
+	CNZ	rbdos	;to print it
+	pop	h	;.max length
+	lxi	d,combuf
+	ldax	d	;how long?
+	cmp	m	;cy if ok
+	jc	movlin
+	mov	a,m	;max length
+	stax	d	;truncate length
+movlin:
+	mov	c,a	;length to c
+	inr	c	;+1
+	inx	h	;to length of line
+	XCHG
+	CALL	MOVE
+	CALL 	GET$SUBADDR
+
+	PUSH	H	;.SUBFLAG
+	INX	H	;.FCB(S1)
+	INX	H	;.FCB(S2)
+	INX	H	;.FCB(RC)
+	DCR	M
+	POP	H
+	CZ	DELETE$SUB
+	LDA	COMBUF+1	;^C?
+	CPI	3
+	RNZ
+	MVI	C,PBUFF
+	LXI	D,CTLCMSG
+	CALL	RBDOS
+	JMP	WBOOT
+;
+subfcb:
+	db	1	;a:
+	db	'$$$     '
+	db	'SUB'
+<EFBFBD>	db	0
+SUBS1:	
+	DB	0,0
+subrc:
+	ds	1
+	ds	16	;map
+subcr:	ds	1
+;
+CTLCMSG:DB	'^C$'
+combuf:	ds	131
+udma:	dw	dbuff
+ccpret:	ds	2	;ccp return address