.TITLE	LLCMD - COMMAND PAGE FOR LOGICAL LINK
	.IDENT	/V01.00/
	.NLIST	BEX
;
; COPYRIGHT (C) 1979, 1980 BY
; DIGITAL EQUIPMENT CORPORATION, MAYNARD, MASS.
;
;
; THIS SOFTWARE IS FURNISHED UNDER A LICENSE AND MAY BE USED AND  COPIED
; ONLY  IN  ACCORDANCE  WITH  THE  TERMS  OF  SUCH  LICENSE AND WITH THE
; INCLUSION OF THE ABOVE COPYRIGHT NOTICE.  THIS SOFTWARE OR  ANY  OTHER
; COPIES  THEREOF MAY NOT BE PROVIDED OR OTHERWISE MADE AVAILABLE TO ANY
; OTHER PERSON.  NO TITLE TO AND OWNERSHIP OF  THE  SOFTWARE  IS  HEREBY
; TRANSFERRED.
;
; THE INFORMATION IN THIS SOFTWARE IS SUBJECT TO CHANGE  WITHOUT  NOTICE
; AND  SHOULD  NOT  BE  CONSTRUED  AS  A COMMITMENT BY DIGITAL EQUIPMENT
; CORPORATION.
;
; DIGITAL ASSUMES NO RESPONSIBILITY FOR THE USE OR  RELIABILITY  OF  ITS
; SOFTWARE ON EQUIPMENT WHICH IS NOT SUPPLIED BY DIGITAL.
;
;
; MODULE DESCRIPTION:
;
;	COMMAND ROUTINE FOR LOGICAL LINK DISPLAY
;
;
;
; DISTRIBUTED SYSTEMS SOFTWARE ENGINEERING
;
; IDENT HISTORY:
;
; 1.00	15-APR-80
;

	.SBTTL	MACROS

;
; MCALLS AND MACROS
;

	.MCALL	QIOW$,DIR$

;
; LOCAL MACROS
;
	.MACRO	MESS,TXT		; CREATE ASCII STRING PRECEDED BY LENGTH
	.NCHR	SYM,<TXT>
	.WORD	SYM
	.ASCII	/TXT/
	.ENDM


	.MACRO	PRINT,TXT		; WRITE TEXT TO TERMINAL
	MOV	#TXT+2,QIO+Q.IOPL
	MOV	TXT,QIO+Q.IOPL+2
	DIR$	#QIO
	.ENDM


	.MACRO	SKIP,N			; WRITE N BLANK LINES TO TERMINAL
	MOV	#LF,QIO+Q.IOPL
	MOV	#N,QIO+Q.IOPL+2
	DIR$	#QIO
	.ENDM

	.MACRO	FLAG,DD			; FLAG CHARACTER AS NEW
	BISB	#200,DD
	.ENDM

	.SBTTL	SEGMENT DEFINITION

	.PSECT	INIT,OVR,I,LCL

	.WORD	CMD		; ENTRY POINT, FIRST WORD

	.SBTTL	LOCAL DATA


LF:	.BYTE	40		; FIRST BLANK LINE IS FREE FROM TTDRV
	.REPT	25.
	.BYTE	12		; LINE FEED
	.ENDR
	.EVEN
;
; DPB'S USED FOR INITIAL COMMAND INPUT
;
QIO:	QIOW$	IO.WVB,$DLUN,$QIOF,,,,<,,40>
PRMPT:	QIOW$	IO.WVB,$DLUN,$QIOF,,,,<PROMPT,10.,'$>
READ:	QIOW$	IO.RVB,$DLUN,$QIOF,,ISTAT,,<CMDBUF,40.>			

;
; TEXT LINES USED FOR INITIAL COMMAND INPUT
;
	.ENABL	LC

LINE1:	MESS	<THE FOLLOWING COMMANDS ARE AVAILABLE FOR THIS PAGE:>
	.EVEN
LINE2:	MESS	<RATE=s     TO CHANGE REPLOT RATE TO s SECONDS>
	.EVEN
LINE3:	MESS	<LLA=l      TO DISPLAY LOGICAL LINK ADDRESS l>
	.EVEN
LINEN:	MESS	<<CR> TO RETURN>
	.EVEN
ERM:	MESS	<ILLEGAL COMMAND>
	.EVEN
ERMLNK:	MESS	<ILLEGAL LOGICAL LINK ADDRESS>
	.EVEN
PROMPT:	.ASCII	/COMMAND > /
	.EVEN

	.DSABL	LC
;
; COMMAND BUFFER AND GENERAL DATA FOR INITIAL COMMAND INPUT
;
CMDBUF:	.BLKW	<42.+1>/2
ERSTAT:	.WORD	0
ISTAT:	.WORD	0,0						

	.SBTTL	CMD - REMOTE NODE COMMAND PROCESSING

;+
;
; CMD - REMOTE NODE DISPLAY COMMAND PROCESSING
;
; INPUTS: NONE
;
; OUTPUTS:
;	ANY COMMAND SPECIFIED IS PROCESSED
;
;-

CMD:	CALL	$CLEAR		; BLANK SCREEN
	PRINT	LINE1		; PRINT LINE 1
	SKIP	2		; SKIP 2 BLANK LINES
	PRINT	LINE2		; PRINT LINE 2
	SKIP	1
	PRINT	LINE3		; PRINT LINE 3
	SKIP	1
	PRINT	LINEN
	SKIP	3		; SKIP TO LOWER PART OF SCREEN

IN:	MOV	#42,R0
	MOV	#CMDBUF,R1
1$:	CLRB	(R1)+
	SOB	R0,1$
	DIR$	#PRMPT		; OUTPUT PROMPT
	DIR$	#READ		; READ COMMAND
	MOV	#CMDBUF,R1
	MOV	R1,R2		; SAVE
	TST	ISTAT+2		; BLANK LINE, RETURN		
	BNE	10$		; COMMAND GIVEN, PROCESS	
	RETURN

10$:	CMPB	#40,(R2)	; DEBLANK LINE
	BEQ	30$
	CMPB	#141,(R2)	; ALSO CONVERT LOWER CASE TO UPPER
	BHI	20$
	BICB	#040,(R2)	; CONVERT
20$:	MOVB	(R2),(R1)
	INC	R1
30$:	INC	R2
	TSTB	(R2)
	BNE	10$		; STOP WHEN PAST <CR>
	CLRB	(R1)		; FORCE ZERO AT END OF DEBLANKED LINE
	MOV	#CMDBUF,R1	; START AT BEGINNING AGAIN
	CMPB	#'R,(R1)	; RATE=S COMMAND
	BEQ	RATE
	CMPB	#'L,(R1)	; LLA=L COMMAND
	BEQ	LLA
CERR:	PRINT	ERM		; COMMAND ERROR
	BR	IN		; READ ANOTHER COMMAND

RATE:	TSTB	(R1)		; FIND '='
	BEQ	CERR		; DIDN'T FIND ONE
	CMPB	#'=,(R1)
	BEQ	10$
	INC	R1
	BR	RATE
10$:	INC	R1		; PAST '='
	TSTB	(R1)		; ANYTHING PAST IT
	BEQ	CERR
	MOV	R1,R0
	CALL	$CDTB
	TSTB	(R0)		; NOTHING MUST BE PAST NUMBER
	BNE	CERR
	MOV	R1,$TMG		; STORE NEW RATE
	JMP	IN

LLA:	TSTB	(R1)		; FIND '='
	BNE	5$		; BR IF FOUND ONE
	PRINT	ERM		; DIDN'T FIND ONE
	JMP	IN
5$:	CMPB	#'=,(R1)
	BEQ	10$
	INC	R1
	BR	LLA
10$:	INC	R1		; PAST '='
	TSTB	(R1)		; ANYTHING PAST IT
	BNE	15$		; BR IF FOUND ONE
	PRINT	ERM		; DIDN'T FIND ONE
	JMP	IN
15$:	CMP	ISTAT+2,#7.	; LOGICAL LINK ADDRESS MORE THAN 3 CHARACTERS?
	BLOS	20$		; BR IF NO
	PRINT	ERMLNK		; PRINT ERROR MESSAGE
	BR	40$

20$:	MOV	R1,R0		; POINT TO NUMBER
	CALL	$CDTB		; CONVERT IT TO BINARY
	TSTB	(R0)		; NOTHING MUST BE PAST NUMBER
	BEQ	30$		; BR IF OK
	PRINT	ERMLNK		; PRINT ERROR MESSAGE
	BR	40$		; FINISHED
30$:	MOV	R1,$XCLLA	; STORE LOGICAL LINK ADDRESS
40$:	JMP	IN
	.END