.TITLE	EXIT - PROGRAM EXIT FOR TECOIO

	.IDENT	"X0210"

;
; COPYRIGHT (C) 1976 BY DIGITAL EQUIPMENT CORPORATION,
; MAYNARD, MASSACHUSETTS
;
; THIS SOFTWARE IS FURNISHED UNDER A LICENSE FOR USE ONLY ON A
; SINGLE  COMPUTER  SYSTEM AND MAY BE COPIED ONLY WITH THE IN-
; CLUSION OF THE ABOVE COPYRIGHT NOTICE.   THIS  SOFTWARE,  OR
; ANY  OTHER  COPIES THEREOF, MAY NOT BE PROVIDED OR OTHERWISE
; MADE AVAILABLE TO ANY OTHER PERSON EXCEPT FOR  USE  ON  SUCH
; SYSTEM  AND TO ONE WHO AGREES TO THESE LICENSE TERMS.  TITLE
; TO AND OWNERSHIP OF THE SOFTWARE SHALL AT ALL  TIMES  REMAIN
; IN DIGITAL.
;
; THE INFORMATION IN THIS SOFTWARE IS SUBJECT TO CHANGE  WITH-
; OUT  NOTICE  AND  SHOULD NOT BE CONSTRUED AS A COMMITMENT BY
; DIGITAL EQUIPMENT CORPORATION.
;
; DIGITAL EQUIPMENT CORPORATION ASSUMES NO RESPONSIBILITY  FOR
; THE USE OR RELIABILITY OF ITS SOFTWARE ON EQUIPMENT WHICH IS
; NOT SUPPLIED BY DIGITAL.
;
; ANDREW C. GOLDSTEIN  3-JAN-78  11:58

	.MCALL	EXIT$S,DIR$


EX$ERR	= 2			; EXIT WITH ERROR STATUS
EX$SUC	= 1			; EXIT WITH SUCCESS STATUS

.SBTTL	EXIT ROUTINES

;+
;
; *** - EXERR	EXIT WITH ERROR STATUS
;
; THIS ENTRY IS CALLED BY TECO WHEN IT IS EXITING DUE TO AN ERROR AND
; THE EXIT-ON-ERROR BIT IN ETYPE IS SET.
;
; *** - GEXIT	EXIT AND GO
;
; *** - TEXIT	EXIT
;
; THESE TWO ENTRIES ARE CALLED BY TECO TO EXIT. "TEXIT" SIMPLY EXITS
; TO THE MONITOR; "GEXIT" IS AN EXIT AND GO. SINCE ITS FUNCTION IS
; NOT CLEARLY DEFINED IN RSX-11, IT ALSO JUST EXITS TO THE MONITOR.
;
; NO INPUTS, NO OUTPUTS, NO RETURN.
;
;-

	.PSECT	CODE,RO
	.ENABL	LSB

EXERR::
	MOV	#EX$ERR,-(SP)	; SET FOR EXIT WITH ERROR STATUS
	BR	10$

GEXIT::

TEXIT::
	MOV	#EX$SUC,-(SP)	; SET FOR EXIT WITH SUCCESS STATUS
10$:	TST	OUTFDB+F.BDB	; SEE IF THERE IS AN OUTPUT FILE OPEN
	BEQ	20$		; BRANCH IF NOT
	CALL	KILFIL		; IF SO, DELETE IT
20$:	CALL	CLOSIF		; CLOSE THE INPUT FILE IF NECESSARY
	CALL	INDCLS		; CLOSE THE INDIRECT FILE IF OPEN
	CALL	TDRDEL		; DELETE TEMP DIRECTORY, IF ANY
	CALL	TTDET		; DETACH THE TERMINAL
	MOV	#<2*256.>+29.,-(SP) ; EXIT WITH STATUS DIC
	DIR$			; TRY EXIT WITH STATUS
	EXIT$S			; ELSE DO NORMAL EXIT

	.DSABL	LSB

.SBTTL	MAINTAIN VT52 DISPLAY

;+
;
; *** - WATCH	MAINTAIN DISPLAY
;
; THIS ROUTINE APPEARS HERE AS A NULL ROUTINE TO MAINTAIN THE TEXT DISPLAY.
; IT OCCUPIES THE OVERLAYABLE PSECT "SCREEN" AND MAY BE OVERLAID WITH A REAL
; ROUTINE TO MAINTAIN THE DISPLAY (SUCH AS THE VT52 SCREEN MODULE).
;
; INPUTS:	NONE
;
; OUTPUTS:	NONE
;
; ALL REGISTARE PRESERVED
;
;-

	.CSECT	SCREEN

SCREEN::.WORD	0		; AMOUNT OF IMPURE AREA NEEDED BY DISPLAY
WATCH::	CLC
	RETURN			; DUMMY ROUTINE

.SBTTL	FLAG READ/WRITE INTERCEPT

;+
;
; *** - FLAGRW	INTERCEPT FLAG MODIFICATIONS
;
; THIS ROUTINE IS CALLED BY ALL TECO COMMANDS READING OR WRITING THE VARIOUS
; FLAGS. THE ONLY ONE OF CONCERN IS THE SETTING AND CLEARING OF THE
; DETACH FLAG.
;
; INPUTS:
;
;	R0 = NEW FLAG VALUE (IF R3 = -1)
;	R2 = OFFSET TO FLAG CELL FROM R5
;	R3 = -1 IF FLAG IS BEING WRITTEN
;	  >< -1 IF FLAG IS BEING READ
;
; OUTPUTS:
;
;	NONE
;
; ALL REGISTERS PRESERVED
;
;-

	.PSECT	CODE,RO

FLAGRW::
	SAVE
	CMP	R2,#ETYPE	; SEE IF WE ARE MODIFYING THE ET FLAG
	BNE	20$		; BRANCH IF NOT
	INC	R3		; SEE IF WE ARE WRITING IT
	BNE	20$		; BRANCH IF NOT
	MOV	ETYPE(R5),R1	; GET OLD VALUE
	MOV	R0,R2		; COPY NEW VALUE
	BIC	R1,R2		; COMPUTE XOR OF VALUES
	BIC	R0,R1		; IN R1
	BIS	R2,R1		;
	BIT	#ET.DET,R1	; SEE IF THE DETACH FLAG IS CHANGING
	BEQ	20$		; BRANCH IF NOT
	BIT	#ET.DET,R0	; IF IT IS BEING SET
	BEQ	10$
	CALL	TTDET		; DETACH THE TERMINAL AS REQUESTED
	BR	20$
10$:	CALL	TTATT		; OR ATTACH IF IT IS BEING CLEARED
20$:	RETURN

.SBTTL	NO CONTROL/O

;+
;
; *** - NOCTLO	NO CONTROL/O
;
; THIS ROUTINE DISABLES THE AFFECT OF A PREVIOUSLY TYPED CONTROL O
;
; INPUTS:	NONE
;
; OUTPUTS:	NONE
;
; ALL REGISTERS ARE PRESERVED
;
;-

NOCTLO::
	BIT	#ET.DET,ETYPE(R5) ; IF RUNNING DETACHED
	BNE	10$		; CTRL O IS UP TO THE TERMINAL DRIVER
	CALL	TTDET		; DETACH THE TERMINAL
	CALL	TTATT		; AND REATTACH IT
10$:	RETURN



	.END