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Trailing-Edge - PDP-10 Archives - bb-x130a-sb - sed1cm.mac
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TITLE	SED1CM - GENERAL SED FILE-CHANGING COMMANDS
SUBTTL	A CHRISTOPHER HALL FECIT

;COPYRIGHT (C) DIGITAL EQUIPMENT CORPORATION 1979,1983.

	SEARCH	SEDSYM
	SALL

IFN TOPS10,<
	SEARCH	UUOSYM
	TWOSEG
	RELOC	400000
>
IFE TOPS10,<
	SEARCH	MONSYM
>

;HERE ON LINEFEED, WHICH ERASES THE LINE THAT THE CURSOR GOES TO
;NOTE: this command is obsolete; replaced by ERASE-LINE

LNFPAR::TLNN	TM,LSD		;IS LINEFEED REALLY A CURSOR DOWN?
	JRST	KILPAR		;NO - DELETE ENTIRE PARAMETER
	MOVEI	DO,$CURDN	;YES - DO A DOWN INSTEAD
	JRST	DWNARG

KILPAR::MOVE	T1,[POINT 7,PARBUF] ;POINT TO START OF PARAMETER BUFFER
	MOVEM	T1,PARPTR
	TRZN	F,CMV		;CLEAR CURSOR MOVE FLAG - ON?
	JRST	ENTERM		;NO - CLEAR BOTTOM LINE, PROMPT, AND LOOP
	DMOVE	RW,SAVPOS	;YES - RESTORE SAVED POSITION
	JRST	ENTERM		;NOW CLEAR, PROMPT, AND LOOP

LNFEED::TLNE	TM,LSD		;IS LINEFEED REALLY A CURSOR DOWN?
	JRST	[MOVEI DO,$CURDN;YES - DO A DOWN INSTEAD
		 JRST  DOWN]
	TRNE	F,RDO		;IS FILE READ-ONLY?
	JRST	RDOERR		;YES - COMMAND IS ILLEGAL
	SOS	ISVCNT		;DECREMENT INCREMENTAL SAVE COUNTER
	TLO	F,CHG		;SAY FILE HAS BEEN MODIFIED
	CAMN	RW,LPP.1	;AT BOTTOM OF SCREEN?
	JRST	LNFERR		;YES - ILLEGAL
	AOJ	RW,		;MOVE TO NEXT ROW
	MOVEI	T1,15		;MOVE TO START OF LINE
	IDPB	T1,TY
	PUSHJ	P,CDOWN		;MOVE DOWN ONE
	PUSHJ	P,CLRLNA	;ERASE THE ENTIRE LINE
	PUSHJ	P,POSCUR
	TLZ	F,XPL!PCM	;SAY LINE POINTER IS BE GOOD; KILL MARK
	PUSHJ	P,MAKLPT	;AND MAKE IT (IN LINPTR AND PT)
	SETZ	T2,		;GET A NULL
LNFED1:	ILDB	T1,PT		;GET A CHARACTER
	CAIN	T1,15		;CARRIAGE RETURN?
	JRST	LNFED3		;YES - CHECK FOR END OF LINE
LNFED2:	DPB	T2,PT		;ELSE NULL OUT THE CHARACTER
	JRST	LNFED1		;AND GET ANOTHER

LNFED3:	PUSHJ	P,ISCRLF	;IS IT REALLY A CRLF?
	JRST	LNFED2		;NO - JUST NULL OUT THE <CR>
	TLO	F,XPC		;SAY CHARACTER POINTER IS BAD
	JRST	LOOP		;DONE

LNFERR:	MOVEI	T1,[ASCIZ /#Can't erase last line of display/]
	JRST	ERROR

;HERE TO ERASE ALL CHARACTERS FROM THE CURSOR TO THE END OF THE LINE
;ENTER ERASE-LINE ERASES PARAMETER (KILPAR)

ERASLN::TRNE	F,RDO		;IS FILE READ-ONLY?
	JRST	RDOERR		;YES - COMMAND IS ILLEGAL
	MOVEI	T1,^D1000	;SET TO CLOSE A LOT OF SPACES
	JRST	CLSNP0		;LET CLOSE-SPACES HANDLE IT

;**********************************************************************
;HERE TO MOVE TO THE BEGINNING OF THE LINE, UNLESS CURSOR IS AT BEGINNING,
;IN WHICH CASE IT MOVES TO THE END

LINARG::TRON	F,CMV		;ALREADY DOING CURSOR MOVEMENT?
	PUSHJ	P,MARKUP	;NO - PUT CURSOR BACK IN TEXT

LINE::	TDZN	CM,CM		;MOVE TO THE BEGINNING - ALREADY THERE?
	JRST	LINEND		;YES - MOVE TO END INSTEAD
	TLO	F,XPC		;CHARACTER POINTER IS BAD
	JRST	DISCUR		;DISPLAY THE CURSOR AND LOOP

LINEND::TLO	F,XPC!XPL	;CHARACTER AND LINE POINTERS ARE BAD
	AOJA	RW,WBTAB	;GO DO A WORDWISE BACKTAB FROM NEXT LINE

;**********************************************************************
;HERE ON ENTER-CONTROL-CHARACTER COMMAND. SET FLAG SO IF NEXT
;CHARACTER IS ASCII IT WILL BE MADE A CONTROL CHARACTER
;(ELSE THERE IS NO EFFECT)

ENTCCH::TLO	F,CCH		;SET THAT OL' FLAG
IFE TOPS10,<
IFN FTECHO,<
	PUSHJ	P,EKOALL	;BREAK ON NEXT CHARACTER AND DON'T ECHO IT
>>
	JRST	LOOP		;THAT'S ALL

;**********************************************************************
;HERE ON INSERT MODE TOGGLE COMMAND. SET FLAG SO CHARACTERS TYPED
;WILL BE INSERTED AT CURSOR POSITION, AND NOT REPLACE THE EXISTING CHARACTER
;TYPING THE COMMAND AGAIN REVERSES THIS EFFECT

INSMOD::TRC	F,IMD		;TOGGLE THE INSERT MODE FLAG
	TRNE	F,XCT!XBN	;EXECUTING?
	JRST	LOOP		;YES - DONE NOW
IFE TOPS10,<
IFN FTECHO,<
	PUSHJ	P,INSBP2	;TURN ECHO ON OR OFF DEPENDING ON MODE
>>
	TLNE	TM,BEP		;WANT TO BEEP INSTEAD OF WORKING WITH MESSAGE?
	JRST	INSBEP		;YES - GO DO SO
	PUSHJ	P,FIXBLN	;NO - REPAIR THE BOTTOM LINE
	PUSHJ	P,POSCUR	;REPOSITION THE CURSOR
	JRST	LOOP		;AND LOOP

INSBEP:	TRNE	F,IMD		;NOW IN INSERT MODE?
	JRST	INSBP1		;NO - BEEP ONCE
	TYPCHI	207		;BEEP ONCE
	SNOOZE	^D0400		;WAIT A WHILE
INSBP1:	TYPCHI	207		;BEEP AGAIN
	JRST	LOOP

IFE TOPS10,<
IFN FTECHO,<
INSBP2:	TRNN	F,IMD		;IN INSERT MODE?
	JRST	EKONPT		;NO - BREAK ON NON-PRINTING CHARACTERS
	JRST	EKOALL		;NO - NO ECHO; BREAK ON ALL CHARACTERS
>>
;**********************************************************************
;SAVE-THE-FILE COMMAND

SAVEIT::TRNN	F,RDO		;IS FILE READ-ONLY,
	TLNN	F,CHG		;  OR UNMODIFIED?
	JRST	SAVITX		;YES - DON'T TRY TO SAVE IT
	PUSHJ	P,INCSAV	;SAVE THE FILE
	JRST	LOOP		;THAT'S ALL

SAVITX:	MOVEI	T1,[ASCIZ /####File not changed - not saved/]
	JRST	ERROR

;SUBROUTINE TO DO AN INCREMENTAL SAVE

INCSAV::DMOVE	T1,ISVNUM	;RESET COMMAND INCREMENTAL SAVE COUNT
	DMOVEM	T1,ISVCNT	;AND TYPEIN INCREMENTAL SAVE COUNT
	MOVEI	T1,SQZVAL	;RESET # OF COMMANDS TO SKIP BETWEEN SQUEEZES
	MOVEM	T1,SQZCNT
	TRNN	F,RDO		;IS FILE READ-ONLY?
	TLNN	F,CHG		;NO - HAS IT BEEN MODIFIED?
	POPJ	P,		;READ-ONLY OR NOT MODIFIED - DON'T SAVE FILE
	MOVEI	T1,[ASCIZ /SAVING FILE - WAIT/]
	PUSHJ	P,PUTBTM	;PUT MESSAGE ON BOTTOM LINE
	PUSHJ	P,PROTOF
	PUSHJ	P,PUTTYP
IFN TOPS10,<
	MOVEI	PT,FILBLK	;POINT TO NAME OF CURRENT FILE
>
	MOVEI	T4,FILSPC
	SKIPE	INJFN		;IS THERE A JFN?
	PUSHJ	P,SAVFLC	;YES - SAVE THE FILE
IFN FTJOUR,<
	TLNE	TM,JRW		;WRITING A JOURNAL?
	PUSHJ	P,JRNSTT	;YES - START UP A NEW ONE
>
IFN TOPS10,<
	TLO	F,XPL!XPC	;LINE AND CHARACTER PTRS ARE NOW BAD
	PUSHJ	P,FIXBLN	;REPAIR THE BOTTOM LINE
	JRST	POSCUR		;RE-POSITION THE CURSOR AND RETURN
>
IFE TOPS10,<
	TRO	F,GFL		;NOTE THAT FILE IS EXISTS
	TLO	DO,500000	;TELL SET-FILE THAT INCSAV CALLED IT
	POP	P,		;KILL CALL TO INCSAV
	JRST	SETFL1		;CONNECT TO THE FILE AGAIN; GET NEW COMMAND
>
;**********************************************************************
;HERE TO ADD BLANK LINES TO THE BUFFER

OPENLN::TRNE	F,RDO		;IS FILE READ-ONLY?
	JRST	RDOERR		;YES - COMMAND IS ILLEGAL
	MOVE	T4,ADDLNS	;GET LAST TIME'S NOMINAL
	TLNN	F,ENT		;IS THERE A PARAMETER TYPED?
	JRST	OPLNPM		;NO - USE THE ONE ALREADY SET UP
	MOVEM	T4,PARG1
	PUSHJ	P,PEEL.1	;READ NEW PARM, IF ANY
	MOVE	T4,PARG1	;GET LINES TO ADD
	MOVEM	T4,ADDLNS	;SAVE AS NEW NOMINAL
	TRNE	F,CMV		;CURSOR MOVEMENT?
	JRST	[MOVE  T1,PARG2    ;YES - GET SPACES TO OPEN, TOO
		 ADD   T1,SAVPOS+1 ;COUNT SPACES FROM LEFT MARGIN
		 ADD   T1,SL
		 MOVEM T1,ADDLSP
		 JRST  OPLNP0]
	SETZM	ADDLSP		;IF NO CURSOR MOVE, CLEAR EXTRA SPACES
OPLNP0:	PUSHJ	P,ERASPM	;RESET ENTER MODE
	TLNE	TM,XCI		;INITIALIZING FOR AN EXECUTE?
	JRST	LOOP		;YES - DONE NOW
OPLNPM::JUMPLE	T4,CLSLNE	;DONE, IF OPENING ZERO LINES
	SOS	ISVCNT		;DECREMENT INCREMENTAL SAVE COUNTER
	TLZ	F,PCM		;CANCEL THE PICK-CLOSE MARK, IF ANY
	PUSHJ	P,MAKCPT	;RE-MAKE CURSOR POSITION
	CAIN	T3,11		;IS CHARACTER AT CURSOR A TAB?
	PUSHJ	P,RPLTAB	;YES - REPLACE IT WITH SPACES

	MOVE	T4,ADDLNS	;GET LINES TO ADD
	LSH	T4,1		;MULTIPLY COUNT BY 2, FOR <CR><LF>
	MOVEM	T4,NUMCHR	;GO ADD THAT MANY <LF>S
	MOVEI	T1,12		;  (CHANGE HALF OF 'EM TO <CR>S LATER)
	MOVEM	T1,CHARAC
	PUSHJ	P,MAKCHR
	TLO	F,XPB!CHG	;SAY BOTTOM POINTER BAD; FILE MODIFIED

	MOVEI	T1,15		;NOW CHANGE HALF THE <LF>S TO <CR>S
	MOVE	PT,CHRPTR	;GET POINTER TO CURSOR POSITION
	MOVE	T4,ADDLNS	;AND NUMBER OF LINES TO ADD
	IDPB	T1,PT		;SET UP A NEW LINE
	IBP	PT
	SOJG	T4,.-2		;LOOP UNTIL ALL LINES SET UP
	SKIPG	T4,ADDLSP	;NOW GOT SOME SPACES TO ADD?
	JRST	OPNLD0		;NO - JUST RE-DISPLAY
	MOVEM	T4,NUMCHR
	EXCH	PT,CHRPTR
	PUSH	P,PT
	PUSHJ	P,MAKSPC	;ADD THE SPACES
	POP	P,PT		;RESTORE THE REAL CHARACTER POINTER
	EXCH	PT,CHRPTR
OPNLD0:	MOVE	T4,ADDLNS	;GET SIZE OF OPEN

;@@ bug here - ADDLSP shouldn't be reset below

	TRNN	F,RST		;WANT TO RESTORE THE NOMINAL PARAMETERS?
	JRST	OPNLDA		;NO - SKIP THIS
	MOVEI	T1,1
	MOVEM	T1,ADDLNS	;YES - SET BACK TO ONE LINE
	SETZM	ADDLSP		;  AND NO SPACES

OPNLDA:	PUSHJ	P,OPENLD	;OPEN UP THE SCREEN **MAY NOT RETURN**
	JUMPN	CM,OPNLDX	;JUMP IF STARTING WITHIN A LINE
	SKIPN	ADDLSP		;WERE SPACES ADDED TOO?
	JRST	OPLDX1		;NO - JUST POSITION AND LOOP
	PUSHJ	P,CDOWN		;ELSE MOVE DOWN
OPNLDX:	PUSHJ	P,DISONE	;RE-DO THAT LINE
OPLDX1:	PUSHJ	P,FIXBLW	;PUT MESSAGES, IF ANY, ON THE BOTTOM LINE
	JRST	DISCUR		;RE-POSITION CURSOR AND LOOP

;SUBROUTINE TO OPEN (T4) LINES ON THE SCREEN (USED BY OPENLN, PUT)
;NOTE: WILL NOT RETURN IF REST OF SCREEN MUST BE DISPLAYED (JRSTS TO LOOP)

;IF INSERT IS LONGER THAN LINES BELOW THE CURSOR,
;  IF TERMINAL CAN CLEAR TO EOP, DO THE CLEAR (RETURN IF PUT, ELSE LOOP)
;    ELSE DISPLAY THE ENTIRE SCREEN (LOOP)
;ELSE IF INSERT FITS WITHIN THE SCREEN
;  IF TERMINAL CAN INSERT LINES, INSERT THEM (RETURN)
;    ELSE IF CURSOR IS HOME AND TERMINAL CAN ROLL DOWN, ROLL DOWN (RETURN)
;      ELSE DISPLAY FROM CURSOR TO END OF SCREEN (LOOP)

OPENLD::MOVE	T1,LPP(TM)	;FIND NUMBER OF LINES BELOW CURSOR
	SUB	T1,RW
	CAMG	T1,T4		;ADDING MORE THAN THAT?
	JRST	OPNLD2		;YES - KILL THE RETURN
	SKIPN	T3,ILN(TM)	;CAN TERMINAL OPEN ITS OWN LINES?
	JRST	OPNLDR		;NO - GO REDISPLAY FROM HERE DOWN
	PUSHJ	P,POSCUR	;YES - POSITION THE CURSOR
	TLZ	F,FBL		;BOTTOM LINE WILL BE IN GOOD SHAPE
	JUMPE	CM,OPLD1A	;WITHIN A LINE?
	PUSHJ	P,CLRLNR	;YES - CLEAR TO END OF LINE
	MOVEI	T1,15		;DROP TO START OF NEXT LINE
	IDPB	T1,TY

OPNLD1:	PUSHJ	P,CDOWN
OPLD1A:	MOVE	T1,T3		;OPEN UP ONE LINE
	PUSHJ	P,PUTSEQ
	SOJG	T4,OPNLD1	;LOOP THROUGH ALL LINES
	POPJ	P,		;DONE

OPNLD2:	SKIPN	CPG(TM)		;IS THERE A SEQUENCE FOR CLEAR-TO-EOP?
	JRST	DISALL		;NO - GO DISPLAY ENTIRE SCREENFUL
	PUSHJ	P,POSCUR	;YES - REPOSITION THE CURSOR
	PUSHJ	P,CLEARP	;CLEAR TO END OF SCREEN
	CAIN	DO,$PUT		;GOT A PUT COMMAND?
	POPJ	P,		;YES - RETURN TO PUT THE BUFFER
	POP	P,		;NO - KILL RETURN TO CALLER
	PUSHJ	P,PUTTYP	;OUTPUT ALL THIS
	JRST	LOOP		;AND GET A NEW COMMAND

OPNLDR:	JUMPN	RW,OPLDR1	;IF NOT HOME JUST DO DISPLAY
	JUMPN	CM,OPLDR1
	SKIPE	RLD(TM)		;NO ROLL DOWN SEQUENCE,
	CAML	T4,LPP(TM)	;  OR INSERTING LONGER THAN SCREEN SIZE?
	JRST	OPLDR1		;YES - DISPLAY ANYWAY
	PUSHJ	P,CHOME		;HOME THE CURSOR
	PUSHJ	P,ROLLDN	;ROLL AND CLEAR A LINE
	SOJG	T4,.-1		;DO THE PHYSICAL ROLL OF THE SCREEN
	POPJ	P,		;DONE

OPLDR1:	POP	P,		;DISPLAY FROM HERE DOWN AND LOOP
	JRST	DISDWN

;HERE TO REMOVE LINES FROM THE BUFFER (NULL THEM OVER, REALLY)

CLOSLN::TRNE	F,RDO		;IS FILE READ-ONLY?
	JRST	RDOERR		;YES - COMMAND IS ILLEGAL
	MOVE	T4,ADDLNS	;SET UP LAST TIME'S NOMINAL
	TLNN	F,ENT		;IS THERE A PARAMETER TYPED?
	JRST	CLLNPM		;NO - USE THE ONE ALREADY SET UP
	MOVEM	T4,PARG1
	PUSHJ	P,PEEL.1	;READ NEW PARM, IF ANY
	MOVE	T4,PARG1	;GET SPACES TO ADD
	MOVEM	T4,ADDLNS	;SAVE AS NEW NOMINAL
	TRNE	F,CMV		;CURSOR MOVEMENT?
	JRST	[MOVE  T1,PARG2 ;YES - GET SPACES TO CLOSE, TOO
		 ADD   T1,SAVPOS+1 ;COUNT SPACES FROM LEFT MARGIN
		 ADD   T1,SL
		 CAIN  T4,0	   ;CLOSING ZERO LINES?
		 MOVE  T1,PARG2    ;YES - COUNT ONLY SPACES PASSED OVER
		 MOVEM  T1,ADDLSP  ;SAVE NUMBER OF SPACES TO CLOSE
		 JRST  CLOSL1]	   ;(SKIP THE SETZ)
	SETZM	ADDLSP		;IF NO CURSOR MOVE, CLEAR EXTRA SPACES
CLOSL1:	PUSHJ	P,ERASPM	;ERASE PARAMETER
	TLNE	TM,XCI		;INITIALIZING FOR AN EXECUTE?
	JRST	LOOP		;YES - DONE NOW

CLLNPM::DMOVE	T1,ADDLNS	;MOVE NOMINALS TO FRAGGABLE AREA
	DMOVEM	T1,ADDLNX
	SOS	ISVCNT		;DECREMENT INCREMENTAL SAVE COUNTER
	TLNE	F,PCM		;HAS A MARK BEEN MADE?
	JRST	CLSMRK		;YES - DO THINGS DIFFERENTLY
	JUMPG	T4,CLSLN0	;IF CLOSING SOME LINES, CONTINUE
	SKIPN	ADDLSX		;IF ZERO LINES, GOT ZERO SPACES TOO?
	JRST	CLSLNE		;YES - NOTHING TO DO
CLSLN0:	MOVEM	T4,ROLLS	;SAVE NUMBER OF LINES FOR ROLLING AT END
	TLO	F,INS!XPB!CHG	;LET LINE BE EXTENDED; BOTPTR BAD; FILE MOD'D
	PUSHJ	P,MAKCPT	;RE-MAKE CURSOR POSITION
	TLZ	F,INS
	CAIN	T3,11		;IS CHARACTER AT CURSOR A TAB?
	PUSHJ	P,RPLTAB	;YES - REPLACE WITH SPACES BEFORE CURSOR
	MOVE	PT,CHRPTR	;GET CURRENT CURSOR POSITION
	PUSHJ	P,CLSGPT	;SET UP THE POINTER INTO THE DELETE BUFFER
	SETZ	T2,		;GET A NULL
	SKIPN	T4,ADDLNX	;GET NUMBER OF LINES TO CLOSE - ANY?
	JRST	CLSLN3		;NO - JUST GO CLOSE SPACES

CLSLN1:	CAMN	EN,PT		;AT END OF USEABLE BUFFER?
	JRST	CLOSEN		;YES - DO END OF BUFFER-Y THINGS
	ILDB	T1,PT		;GET A CHARACTER
	JUMPE	T1,CLSLN1	;IF NULL, GET ANOTHER ONE
	DPB	T2,PT		;REPLACE IT WITH A NULL
CLSLN2:	CAMN	T3,[010700,,CLSBUF+PCBSIZ-1]
	PUSHJ	P,CLSOVF	;IF ABOUT TO OVERFLOW, STORE ON DISK
	IDPB	T1,T3		;SAVE CHARACTER IN THE CLOSE BUFFER
	AOS	CLSCNT		;BUMP COUNT
	CAIE	T1,15		;CARRIAGE RETURN?
	JRST	CLSLN1		;NO - DRIVE ON

	ILDB	T1,PT		;YES - PICK UP THE <LF>
	DPB	T2,PT		;REPLACE IT WITH A NULL
	CAIE	T1,12		;IS IT REALLY A LINEFEED?
	JRST	CLSLN2		;NO - IT'S NOT THE END OF THE LINE
	SOJG	T4,CLSLN2	;YES - LOOP THROUGH DESIRED NUMBER OF ROWS
	CAMN	T3,[010700,,CLSBUF+PCBSIZ-1]
	PUSHJ	P,CLSOVF	;IF ABOUT TO OVERFLOW, STORE ON DISK
	IDPB	T1,T3		;SAVE THE LINEFEED IN THE CLOSE BUFFER
	AOS	CLSCNT		;BUMP COUNT FOR <LF>
CLSLN3:	SKIPLE	T4,ADDLSX	;GOT SOME SPACES TO CLOSE TOO?
	PUSHJ	P,CLLSPS	;YES - DO THEM

CLSLN4:	TRNE	F,RST		;WANT TO RESTORE THE NOMINAL PARAMETERS?
	PUSHJ	P,CLLRST	;YES - DO SO
	MOVEM	T3,CLAFLG	;SAVE THE ENDING POINTER
	SETZ	T1,		;END THE BUFFER WITH A NULL
	IDPB	T1,T3
	TRNE	F,COV		;HAS BUFFER OVERFLOWED?
	PUSHJ	P,CLSLST	;YES - WRITE OUT THE LAST PIECE
	PUSHJ	P,CCREOL	;MAKE SURE THE FILE ENDS WITH A CRLF
	SOSG	SQZCNT		;TIME TO DO A SQUEEZE?
	PUSHJ	P,SQUEZW	;YES - REMOVE ALL NULL WORDS
	TLZE	F,PCM		;WAS THERE A MARK?
	JRST	DISALL		;YES - RE-DISPLAY THE SCREEN AND LOOP
	SKIPN	ADDLNX		;REALLY CLOSE ANY LINES?
	JRST	CLSLNL		;NO - JUST SPACES - RE-DO ONE LINE
	SKIPN	T3,DLN(TM)	;CAN TERMINAL DO ITS OWN CLOSE?
	JRST	CLSLNR		;NO - DISPLAY ALL FROM HERE DOWN
	MOVE	T4,LPP(TM)	;YES - GET NUMBER OF LINES PER PAGE
	SUB	T4,RW		;LESS CURRENT POSITION
	SUB	T4,ADDLNX	;LESS SIZE OF DELETE, GIVES LINES LEFT
	JUMPL	T4,DISDWN	;IF NONE (BIG DELETE), JUST RE-DISPLAY
	TLNE	F,FNC!FBL	;GOT FENCE OR FRAGGED BOTTOM LINE?
	PUSHJ	P,CBOTOM	;YES - ERASE IT
	MOVE	T4,RW		;MOVE TO START OF THE LINE THE CURSOR IS ON
	PUSHJ	P,POSLIN
	MOVE	T2,ADDLNX	;GET SIZE OF DELETE
	TLNE	F,FNC!FBL	;IS BOTTOM LINE O.K.?
	AOS	ROLLS		;NO - REWRITE ONE MORE LINE
	MOVE	T1,T3		;GET CODE TO CLOSE LINES
	PUSHJ	P,PUTSEQ	;CLOSE A LINE
	SOJG	T2,.-2		;LOOP THROUGH ALL LINES
	SKIPN	ADDLSX
	JUMPE	CM,CLSLN5	;JUMP IF AT START OF A LINE
	MOVE	PT,LINPTR
	PUSHJ	P,DISONE	;ELSE DISPLAY SINGLE CLOSED-UP LINE
CLSLN5:	MOVE	T4,LPP(TM)	;GET LINE NUMBER OF START OF REWRITE
	SUB	T4,ADDLNX
	TLNE	F,FBL		;IS BOTTOM LINE O.K.?
	SOJ	T4,		;NO - RE-DO IT, TOO
	MOVEM	T4,SAVEAC	;SET IT UP IN T4 AND SAVEAC
	PUSHJ	P,ROLFW1	;AND REWRITE FROM THERE DOWN
	JRST	LOOP

CLSLNL:	PUSHJ	P,DISLIN	;DISPLAY REST OF LINE CURSOR IS ON
	JRST	DISCUR		;RESTORE CURSOR AND LOOP

CLSLNR:	JUMPN	RW,DISDWN	;IF NOT HOME JUST DO DISPLAY
	JUMPN	CM,DISDWN
	SKIPN	ADDLSX		;DELETED ANY SPACES,
	SKIPN	RUP(TM)		;  OR NO ROLL UP SEQUENCE?
	JRST	DISDWN		;YES - DISPLAY ANYWAY
	MOVE	T4,ADDLNX	;GET NUMBER OF LINES DELETED
	CAML	T4,LPP(TM)	;LONGER THAN SCREEN SIZE?
	JRST	DISDWN		;YES - DISPLAY ANYWAY
	PUSHJ	P,ROLFW0	;NO - DISPLAY BY DOING A ROLL (AT LAST)
	JRST	LOOP		;DONE

;HERE IF END OF BUFFER REACHED DURING THE CLOSE

CLOSEN:	MOVEM	T3,CLAFLG	;SAVE POINTER TO END OF CLOSE BUFFER
	TRNE	F,RST		;WANT TO RESTORE THE NOMINAL PARAMETERS?
	PUSHJ	P,CLLRST	;YES - DO SO
	MOVE	PT,CHRPTR	;GET POINTER TO FIRST DELETED CHARACTER
	IBP	PT		;PLUS A CHARACTER
	MOVE	EN,PT		;SAVE AS NEW END OF BUFFER
	CAIN	SL,0		;DID CLOSE START AT START OF A LINE?
	CAIE	CM,0
	PUSHJ	P,ADDCR		;NO - PUT A <CRLF> AFTER THAT PARTIAL LINE
	TRNE	F,COV		;HAS BUFFER OVERFLOWED?
	PUSHJ	P,CLSLST	;YES - WRITE OUT THE LAST PIECE
	PUSHJ	P,POSCUR	;PUT CURSOR WHERE IT BELONGS
	SKIPN	CPG(TM)		;CAN TERMINAL CLEAR TO END OF SCREEN?
	JRST	DISALL		;NO - RE-DISPLAY THE ENTIRE SCREEN
	PUSHJ	P,FIXBLC	;YES - CLEAR AND PUT UP THE FENCE
	JRST	DISCUR		;RE-POSITION THE CURSOR AND GET A NEW COMMAND

;SUBROUTINE TO WRITE OUT THE LAST PIECE OF THE CLOSE BUFFER

CLSLST:	SETZ	T1,		;MAKE SURE LAST WORD OF BUFFER IS NULLED
	IDPB	T1,T3
	IDPB	T1,T3
	IDPB	T1,T3
	IDPB	T1,T3
	IDPB	T1,T3
IFN TOPS10,<
	HRRZ	T1,CLAFLG	;GET ADDRESS OF THE LAST BUFFER WORD USED
	MOVNI	T1,CLSBUF(T1)	;FIND -NUMBER OF WORDS IN THIS LAST PIECE
	HRLM	T1,CLSCCL	;SET TO OUTPUT THAT MANY WORDS
>
	PUSHJ	P,CLSOV0	;YES - WRITE OUT THE LAST PIECE
IFN TOPS10,<
	MOVNI	T1,PCBSIZ	;RESTORE FULL BUFFER SIZE
	HRLM	T1,CLSCCL	;  TO CHANNEL COMMAND
>
	JRST	CLSOVE		;CLOSE THE DISK FILE AND RETURN

;HERE TO RESTORE INSERT-DELETE LINES NOMINALS (MAYBE), RE-SET CURSOR, AND LOOP

CLSLNE:	TRNE	F,RST		;WANT TO RESTORE THE NOMINAL PARAMETERS?
	PUSHJ	P,CLLRST	;YES - DO SO
	JRST	DISCUR		;RE-POSITION AND LOOP

CLLRST:	MOVEI	T1,1		;RESTORE THE INSERT/DELETE-LINE NOMINALS:
	MOVEM	T1,ADDLNS	;SET BACK TO ONE LINE
	SETZM	ADDLSP		;  AND NO SPACES
 	POPJ	P,		;DONE

;SUBROUTINE FOR WHEN USER WANTS TO CLOSE SOME SPACES AFTER CLOSING LINES
;(WHICH HE'S INDICATED BY USING CURSOR MOVEMENT)

CLLSPS:	TLO	F,FLG		;SET TO NULL THE CHARACTERS AS THEY ARE FOUND
	MOVE	T2,CLSCNT	;GET NUMBER OF SPACES CLOSED
	PUSHJ	P,SPCBFZ	;NULL OUT (T4)S WORTH OF CHARACTERS
	TLZ	F,FLG		;CLEAR NULLING FLAG
	MOVE	T1,SPCCNT	;GET COUNT OF CHARACTERS
	ADDM	T1,CLSCNT	;ADD TO TOTAL COUNT
	POPJ	P,		;FINISH OFF

;HERE IF MARK WAS MADE - CLOSE FROM STARTING CHARACTER TO CURRENT POSITION
;note: does nothing about starting or ending in a tab

CLSMRK:	PUSHJ	P,MAKCPT	;RE-MAKE CURSOR POSITION
	TLO	F,CHG		;SAY FILE IS CHANGED
	PUSHJ	P,MRKSET	;SET UP TO USE THE MARK
	SETZM	ADDLNX		;CLEAR LINES TO ADD (RE-COMPUTE BELOW)
	PUSHJ	P,CLSGPT	;SET UP THE POINTER INTO THE DELETE BUFFER
	SETZB	T2,T4		;CLEAR CHARACTER COUNT AND GET A NULL
CLSMK1:	CAMN	PT,MRKPTR	;AT END OF THE CLOSE?
	JRST	CLSMKE		;YES - FINISH OFF
	CAMN	T3,[010700,,CLSBUF+PCBSIZ-1]
	PUSHJ	P,CLSOVF	;WRITE TO DISK ON CLOSE BUFFER OVERFLOW
	ILDB	T1,PT		;GET A CHARACTER
	JUMPE	T1,CLSMK1	;SKIP, IF NULL
	IDPB	T1,T3		;SAVE IT IN THE CLOSE BUFFER
	DPB	T4,PT		;NULL OUT THE CHARACTER IN THE FILE
	CAIN	T1,11		;TAB?
	OR	T2,[7,,0]	;YES - COUNT ITS LENGTH IN SPACES
	CAIN	T1,15		;END OF A LINE?
	PUSHJ	P,ISCRLF	;MAYBE - GOT A CRLF PAIR?
	  AOBJP	T2,CLSMK1	;NOT CRLF - COUNT CR AS JUST ANOTHER CHARACTER
	HRRO	T2,T2		;YES - CLEAR NUMBER OF SPACES (AFTER LF FOUND)
	AOS	ADDLNX		;BUMP NUMBER OF LINES
	AOJA	T2,CLSMK1	;AND CONTINUE

CLSMKE:	HLRZM	T2,ADDLSX	;  AND SPACES TO ADD
	HRRZ	T2,T2		;ISOLATE COUNT OF CHARACTERS CLOSED
	ADDM	T2,CLSCNT	;ADD IT TO THE CURRENT COUNT
	MOVE	T1,ADDLNX	;SAVE NUMBER OF LINES
	MOVEM	T1,ROLLS	;  FOR ROLLING AT END
	JRST	CLSLN4		;FINISH OFF

;SUBROUTINE TO SET UP FOR A MARKED PICK OR DELETE-LINES

MRKSET::MOVE	T4,MRKPTR	;GET THE STARTING DISPLAY POINTER
	CAMN	T4,DISPTR	;HAS DISPLAY POINTER CHANGED DURING MARKING?
	TLZ	F,PCM		;NO - CLEAR MARK FLAG (TO HELP DISPLAYING)
	MOVE	T2,CHRPTR	;GET POINTER TO ENDING POSITION
	MOVEM	T2,MRKPTR	;SAVE IT AS POINTER TO END OF REGION
	MOVE	PT,MRCPTR	;GET POINTER TO STARTING POSITION
	MOVE	T3,PT		;  SHIFT BYTE COUNT INTO LOW-ORDER BITS
	ROTC	T2,6		;  (NOW A SIMPLE COMPARE TELLS WHICH IS LARGER)
	MOVE	T0,T2		;PUT AC T2 IN A SAFE PLACE
	CAMGE	T0,T3		;GOING FORWARDS?
	JRST	MRKST1		;NO - FINISH OFF DIFFERENTLY
	PUSHJ	P,PUSMKS	;YES - STACK THE ENDING DISPLAY POINTER
	MOVEM	T4,DISPTR	;MOVE BACK TO THE STARTING DISPLAY POINTER
	DMOVE	RW,SVPMRK	;AND THE STARTING ROW AND COLUMN
	DMOVE	T0,MRLPTR	;SET UP STARTING LINE AND CURSOR POINTERS
	DMOVEM	T0,LINPTR
	POPJ	P,		;DONE

MRKST1:	EXCH	T4,DISPTR	;BACKWARDS - STACK THE ENDING DISPLAY POINTER
	PUSHJ	P,PUSMKS
	MOVEM	T4,DISPTR	;PUT BACK THE STARTING DISPLAY POINTER
	EXCH	PT,MRKPTR	;SWAP START AND END POINTERS
	POPJ	P,		;DONE

;SUBROUTINE TO SET UP T3/PTR TO CLOSE BUFFER. CLEARS THE CHARACTER
;COUNT IFF THE PREVIOUS COMMAND WAS NOT A DELETE-LINES.
;ELSE APPENDS TO THE PREVIOUSLY-DELETED STUFF.
;ALSO, IF BUFFER HAS OVERFLOWED, RE-OPENS DISK FILE FOR APPENDING
;SAVES T1; USES T2, T3

CLSGPT:	SKIPN	T3,CLAFLG	;GET CLOSE-APPEND POINTER - ANY?
	SKIPA	T3,[POINT 7,CLSBUF] ;NO - POINT TO START OF BUFFER
	CAMN	T3,[POINT 7,CLSBUF] ;YES - POINTING TO START OF BUFFER?
	JRST	CLSGPS		;YES - CLEAR COUNT AND RETURN
	TRNN	F,COV		;NO - HAS DELETE BUFFER OVERFLOWED?
	POPJ	P,		;NO - DONE
	HRROI	T2,CLSFIL	;YES - OPEN THE FILE FOR APPENDING
IFN TOPS10,<
	MOVEM	T1,SAVEAC	;SAVE AC T1
	PUSHJ	P,SETIN		;OPEN IT FOR INPUT
	HLRO	T3,T1		;SAVE NEGATIVE FILE SIZE
	PUSHJ	P,SETOU1	;OPEN FOR OUTPUT, TOO
	MOVN	T1,T3		;GET POSITIVE FILE SIZE
	LSHC	T1,-7		;MAKE IT A BLOCK NUMBER
	TLNN	T2,774000	;END EXACTLY ON A BLOCK BOUNDARY?
	AOJA	T1,CLSGPB	;YES - DON'T NEED TO READ ANYTHING
	AOJ	T1,		;NO - READ LAST BLOCK OF FILE
	USETI	5,(T1)
	INPUT	5,CLACCL	;READ IT
	USETO	5,(T1)		;PREPARE TO WRITE THE LAST BLOCK, TOO
	MOVN	T3,T3		;GET NUMBER OF FULL WORDS IN THE FILE
	ANDI	T3,177
	ADD	T3,[POINT 7,CLSBUF-1] ;MAKE IT A POINTER
	ILDB	T1,T3		;MAKE IT POINT AFTER THE DATA
	JUMPN	T1,.-1
	ADD	T3,[70000,,0]	;BACK UP BEFORE THE NULL
	CAIGE	T3,0
	SUB	T3,[430000,,1]
	MOVE	T1,SAVEAC	;RESTORE AC T1
>
IFE TOPS10,<
	MOVEM	T1,CLSJFN	;SAVE T1
 	MOVE	T1,[GJ%SHT]	;OPEN THE PICK BUFFER FOR APPENDING
	GTJFN
	  HALTF
	MOVE	T2,[7B5+OF%APP]
	OPENF
	  HALTF
	EXCH	T1,CLSJFN	;RESTORE T1 AND SAVE JFN
	MOVE	T3,[POINT 7,CLSBUF] ;POINT TO START OF BUFFER
>
	POPJ	P,		;DONE

CLSGPS:	TRZ	F,COV		;SAY DELETE BUFFER HASN'T OVERFLOWED (SO FAR)
	SETZM	CLSCNT		;CLEAR COUNT OF CHARACTERS DELETED
	POPJ	P,		;DONE

IFN TOPS10,<
CLSGPB:	MOVE	T3,[POINT 7,CLSBUF] ;POINT TO START OF BUFFER
	POPJ	P,		;DONE
>
;SUBROUTINE TO FIND (T4) REAL CHARACTERS (NOT NULLS) AT (PT), WHICH IS FRAGGED
;AND PUT THEM IN THE AREA POINTED TO BY T3
;IF FLG IS SET, NULLS THE CHARACTER IN THE FILE BUFFER; ELSE LEAVES IT ALONE
;STOPS WHEN COUNTED OUT. IF END OF LINE REACHED, PADS WITH SPACES
;RETURNS COUNT OF CHARACTERS MOVED IN SPCCNT

;NOTE: PICK OR CLOSE BUFFER can't OVERFLOW WHILE IN THIS ROUTINE, AS LONG AS
;BUFFER SIZE IS LARGER THAN ONE SCREENFUL (80*20/5 = 320 WORDS)
;THAT'S BECAUSE THIS IS REACHED FROM A CURSOR MOVE COMMAND, AND CURSOR MOVE
;CAN'T ENCOMPASS MORE THAN A SCREENFUL.
;WELL, ALMOST:  REAL LONG LINES can OVERFLOW. SO BEWARE OF, SAY, OBJECT FILES

SPCBFZ:	SETZM	SAVEAC		;CLEAR STARTING COLUMN NUMBER
	CAIN	T2,0		;PICKED NOTHING SO FAR?
SPCBUF::MOVEM	CM,SAVEAC	;RIGHT - SAVE COLUMN POSITION INSTEAD
	MOVEM	T4,WRTNUM	;SAVE NUMBER OF CHARS TO NULL
	SETZM	SPCCNT		;CLEAR COUNT OF CHARACTERS MOVED
	SETZB	T1,NUMCHR	;GET A NULL; CLEAR # SPACES TO ADD

SPCBF1:	CAMN	PT,EN		;AT END OF BUFFER?
	JRST	SPCBF4		;YES - PUT IN SOME SPACES AND FINISH UP
	ILDB	T2,PT		;NO - GET A CHARACTER
	JUMPE	T2,SPCBF1	;IGNORE IF NULL
	CAIN	T2,15		;IS IT A <CR>?
	PUSHJ	P,ISCRLF	;YES - GOT A CRLF?
	AOSA	SPCCNT		;NO - BUMP COUNT OF CHARACTERS
	JRST	SPCBF4		;YES - FINISH OFF AND RETURN
	TLNE	F,FLG		;ELSE WANT TO NULL IT OUT?
	DPB	T1,PT		;YES - ZAP
	CAIN	T2,11		;IS IT A TAB?
	JRST	SPCBTB		;YES - SEE HOW LONG THE TAB IS
	IDPB	T2,T3		;NO - SAVE CHARACTER IN THE DESIRED BUFFER
	SOJG	T4,SPCBF1	;AND COUNT IT - GOT ENOUGH?
SPCBEN:	SKIPE	NUMCHR		;GOT ANY SPACES TO ADD,
	TLZN	F,FLG		;REALLY WANT TO ADD THEM?
	POPJ	P,		;NO - JUST RETURN
	JRST	MAKSPC		;YES - ADD THEM AND RETURN

SPCBF4:	ADDM	T4,SPCCNT	;DONE - COUNT THE EXTRA SPACES
	MOVEI	T1," "		;PAD OUT WITH SPACES:
	IDPB	T1,T3		;SAVE SPACES UNTIL COUNTED OUT
	SOJG	T4,.-1
	POPJ	P,		;DONE FOR KEEPS

SPCBTB:	MOVE	T0,WRTNUM	;GET LENGTH OF DELETE
	ADD	T0,SAVEAC	;  PLUS STARTING CURSOR POSITION
	SUB	T0,T4		;  LESS NUMBER TO GO, GIVES PRESENT POSITION
	ANDI	T0,7		;FIND NEGATIVE SIZE OF TAB
	SUBI	T0,10
	ADD	T4,T0		;COUNT OFF THAT MANY SPACES FROM DELETE
	JUMPG	T4,[IDPB T2,T3	;IF STILL MORE TO GO, SAVE TAB
		    JRST SPCBF1];AND CONTINUE
	SOS	SPCCNT		;REMOVE TAB FROM COUNT OF CHARACTERS
	MOVN	T1,T4		;GET COUNT OF SPACES TO ADD TO FILE
	ADDM	T1,NUMCHR
	SUB	T4,T0		;GET COUNT OF SPACES TO ADD TO BUFFER
	MOVEI	T1," "		;AND SAVE OFF THOSE SPACES
	IDPB	T1,T3
	AOS	SPCCNT		;BUMP COUNT OF CHARACTERS
	SOJG	T4,.-2
	JRST	SPCBEN		;AND FINISH UP

;SUBROUTINE FOR OVERFLOW OF CLOSE BUFFER - SAVE ON DISK; SET COV FLAG

CLSOVF:	PUSH	P,T1		;SAVE LIVE CHARACTER
	SETZ	T1,		;STORE A NULL AT END OF CLOSE BUFFER
	IDPB	T1,T3
	TROE	F,COV		;SET CLOSE OVERFLOW FLAG - ALREADY SET?
	JRST	CLSOV1		;YES - FILE ALREADY OPEN
	PUSH	P,T2		;SAVE AN AC
	HRROI	T2,CLSFIL
IFN TOPS10,<
	PUSHJ	P,SETDEL	;DELETE OLD .TMP FILE
>
	PUSHJ	P,SETOUT	;SET UP THE DELETE BUFFER FILE
	MOVEM	T1,CLSJFN
	JRST	CLSOV2

CLSOV0:	PUSH	P,T1		;SAVE AN AC
CLSOV1:	PUSH	P,T2		;SAVE AN AC
IFN TOPS10,<
CLSOV2:	OUTPUT	5,CLSCCL	;WRITE OUT THE CLOSE BUFFER
>
IFE TOPS10,<
	MOVE	T1,CLSJFN
CLSOV2:	HRROI	T2,CLSBUF	;WRITE OUT THE CLOSE BUFFER
	SETZ	T3,
	SOUT
>
	MOVE	T3,[POINT 7,CLSBUF] ;START THE BUFFER AFRESH
	POP	P,T2		;RESTORE ACS
	POP	P,T1		;RESTORE ACS
	POPJ	P,		;CONTINUE

IFN TOPS10,<
CLSOVE:	CLOSE	5,
	RELEAS	5,		;FINISH OFF THE FILE
	POPJ	P,		;DONE
>
IFE TOPS10,<
CLSOVE:	MOVE	T1,CLSJFN	;GET FILE HANDLE
	JRST	SETTMP		;MAKE IT TEMPORARY, CLOSE IT, AND RETURN
>
;**********************************************************************
;HERE TO ADD SPACES TO THE BUFFER

OPENSP::MOVE	T4,ADDSPC	;SET UP LAST TIME'S NOMINAL
	MOVEM	T4,PARG1	;AS DEFAULT FOR THIS TIME
	PUSHJ	P,PEEL.1	;READ NEW PARM, IF ANY
	MOVE	T4,PARG1	;GET SPACES TO ADD
	TRNE	F,CMV		;DOING CURSOR MOVEMENT?
	PUSHJ	P,SPSCUR	;YES - HANDLE THINGS A LITTLE DIFFERENTLY
	MOVEM	T4,ADDSPC	;SAVE NEW NOMINAL
	PUSHJ	P,ERASPM	;ERASE PARAMETER
	TLNE	TM,XCI		;INITIALIZING FOR AN EXECUTE?
	JRST	LOOP		;YES - DONE NOW
OPSNPM::TRNE	F,RDO		;IS FILE READ-ONLY?
	JRST	RDOERR		;YES - COMMAND IS ILLEGAL
	SOS	ISVCNT		;DECREMENT INCREMENTAL SAVE COUNTER
	SKIPG	T1,ADDSPC	;SET UP LAST TIME'S NOMINAL
	JRST	OPNSPE		;DONE, IF NOTHING TO ADD
	TLOA	F,CHG!INS	;SAY FILE HAS BEEN MODIFIED
OPSNP1:	TLO	F,INS		;LET LINE BE EXTENDED IF NECESSARY
	PUSHJ	P,MAKCPT	;RE-MAKE CURSOR POSITION
	TLZ	F,INS!PCM
	MOVEM	T1,NUMCHR	;ADD THE RIGHT NUMBER OF SPACES
	CAIE	T3,11		;IS CHARACTER AT CURSOR A TAB?
	JRST	OPNSP1		;NO - CONTINUE
	MOVE	T1,TABSIZ	;YES - CONVERT THE TAB TO SPACES
	ADDM	T1,NUMCHR
	SETZ	T1,		;AND NULL OUT THE TAB
	DPB	T1,TABPTR
	SKIPN	TABSPC		;POINTING TO START OF TAB?
	TLO	F,XPC		;NO - CHARACTER POINTER IS BAD

OPNSP1:	PUSHJ	P,MAKSPC	;GO ADD THE SPACES
	MOVE	T4,ADDSPC	;GET NUMBER OF SPACES TO ADD
IFN FTIMD,<
	SKIPN	IMO(TM)		;DOES TERMINAL HAVE INSERT MODE?
>
	SKIPE	ISP(TM)		;CAN TERMINAL OPEN SPACES ON ITS OWN?
	PUSHJ	P,OPNSPI	;YES - LET IT (SKIP RETURNS)
	PUSHJ	P,DISLIN	;NO - REWRITE REST OF LINE CURSOR IS ON
	SOSGE	ADDSLN		;WANT TO WORK WITH OTHER LINES?
	JRST	OPNSPE		;NO - GO FINISH UP
	TLO	F,XPC!XPL	;YES - RE-MAKE SOME POINTERS
	MOVE	T1,ADDSPC	;GET SIZE OF INSERT
	AOJA	RW,OPSNP1	;AND DO THE SAME WITH THE NEXT LINE

OPNSPE:	MOVEI	T1,1
	TRNE	F,RST		;WANT TO RESTORE THE NOMINAL PARAMETER?
	MOVEM	T1,ADDSPC	;YES - SET IT BACK TO 1
	JRST	DISCUR		;RE-POSITION THE CURSOR AND LOOP

;SUBROUTINES TO USE THE TERMINAL HARDWARE TO INSERT OR DELETE SPACES
;ENTER WITH T4/ NUMBER OF TIMES TO OUTPUT (T3)
;NORMAL RETURN: LINE HAS TABS, MUST BE RE-DISPLAYED
;SKIP	RETURN: LINE HAS BEEN HANDLED; NO FURTHER ACTION NECESSARY

CLSSPI:	PUSHJ	P,FNDEOL	;SEE IF THERE ARE ANY TABS FROM HERE TO EOL
	  POPJ	P,		;EITHER - GO RE-DISPLAY ENTIRE LINE
	ADD	T1,ADDSPC	;NEITHER - WAS ORIGINAL LINE TOO LONG?
	CAMLE	T1,CPL(TM)
	POPJ	P,		;YES - RE-DISPLAY IT ANYWAY
	AOS	(P)		;NO - SET UP FOR SKIP RETURN
	PUSHJ	P,POSCUR	;POINT TO THE RIGHT POSITION
	MOVE	T1,T3		;GET CODE TO DO THE CLOSE
	PUSHJ	P,PUTSEQ	;CLOSE ONE SPACE
	SOJG	T4,.-2		;LOOP THROUGH ALL SPACES
	JRST	PUTTYP		;OUTPUT THE BUFFER AND SKIP RETURN

OPNSPI::PUSHJ	P,FNDEOL	;SEE IF THERE ARE ANY TABS FROM HERE TO EOL
	  POPJ	P,		;YES - RE-DISPLAY THE REMAINDER OF THE LINE
	AOS	(P)		;SET UP FOR SKIP RETURN
	PUSHJ	P,POSCUR	;MOVE TO THE RIGHT POSITION
IFN FTIMD,<
	SKIPE	IMO(TM)		;DOES THE TERMINAL HAVE INSERT MODE?
	JRST	OPNSII		;YES - INSERT THE HOLE, THEN
>
	MOVE	T1,T3		;GET CODE TO DO THE OPEN
	PUSHJ	P,PUTSEQ	;OPEN ONE SPACE
	SOJG	T4,.-2		;LOOP THROUGH ALL SPACES
	JRST	PUTTYP		;OUTPUT THE BUFFER AND SKIP RETURN

IFN FTIMD,<
OPNSII:	PUSHJ	P,IMODON	;TURN ON INSERT MODE
	MOVEI	T1," "		;GET THE SPACE TO TYPE IN
	IDPB	T1,TY
	SOJG	T4,.-1		;OUTPUT ALL THE SPACES
	PUSHJ	P,IMODOF	;TURN OFF INSERT MODE
	JRST	PUTTYP		;OUTPUT THE BUFFER AND SKIP RETURN
>
;HERE TO DELETE THE PREVIOUS CHARACTER FROM THE BUFFER

DELCHR::TRNE	F,RDO		;IS FILE READ-ONLY?
	JRST	RDOERR		;YES - COMMAND IS ILLEGAL
	JUMPE	CM,LOOP		;DO NOTHING IF AT START OF LINE
	SOS	ISVCNT		;DECREMENT INCREMENTAL SAVE COUNTER
	PUSHJ	P,MAKCPT	;RE-MAKE THE CURSOR POINTER
	MOVEM	CM,SAVEAC	;SAVE THE CURRENT COLUMN POSITION
	CAIN	T3,15		;IS THE CURSOR AT OR BEYOND END OF THE LINE?
	PUSHJ	P,ERSWDL	;YES - FIRST POSITION TO END OF LINE
	CAME	CM,SAVEAC	;WAS THE CURSOR BEYOND THE END OF THE LINE?
	JRST	LOOP		;YES - IT MOVED TO THE END; DONE
	TLO	F,CHG		;NO - SAY THE FILE HAS BEEN MODIFIED
	TLZ	F,PCM		;CANCEL THE PICK-CLOSE MARK, IF ANY
	MOVE	PT,CHRPTR	;GET CHARACTER POINTER
	MOVEM	PT,SAVEAC	;STORE IT IN A SAFE PLACE
	JRST	DELCH2		;JUMP INTO THE LOOP

DELCH1:	ADD	PT,[70000,,0]	;BACK IT UP A NOTCH
	CAIGE	PT,0
	SUB	PT,[430000,,1]
DELCH2:	LDB	T1,PT		;GET THE PREVIOUS CHARACTER
	JUMPE	T1,DELCH1	;SKIP OVER IT IF NULL
	MOVEI	T4,1		;SET LENGTH OF DELETE TO 1
	MOVEM	T4,DELCNT	;SET SIZE OF DELETE BUFFER TO 1, TOO
	MOVE	T2,T1		;KEEP THE CHARACTER IN T2
	ROT	T1,-7		;LEFT JUSTIFY THE CHARACTER
	MOVEM	T1,DELBUF	;SAVE IT IN THE DELETE BUFFER
	CAIN	T3,11		;IS THE CHARACTER UNDER THE CURSOR A TAB?
	JRST	DELCHT		;YES - HANDLE SPECIALLY
	DPB	T1,PT		;NULL OUT THE LIVE CHARACTER
	CAIE	T2,11		;WAS A TAB DELETED?
	SOJA	CM,CLSNP3	;NO - CORRECT THE DISPLAY AND LOOP
	PUSHJ	P,CALCML	;YES - POSITION TO THE CHARACTER BEFORE THE TAB
	  JRST	CLSLNL
	JRST	CLSLNL		;RE-DISPLAY THE REST OF THE LINE; LOOP

;HERE WHEN THE CHARACTER UNDER THE CURSOR IS A TAB. FIND THE POSITION
;OF THE PREVIOUS CHARACTER. IF THE CURSOR IS NEXT TO IT, DELETE IT;
;IF THE CURSOR IS WITHIN THE TAB, DELETE THE TAB
;PT/ DPB POINTER TO PREVIOUS CHARACTER; SAVEAC/ DPB POINTER TO TAB

DELCHT:	MOVEM	CM,SAVEAC+1	;SAVE CURSOR POSITION
	PUSHJ	P,CALCML	;POSITION TO THE CHARACTER BEFORE THE TAB
	  TDZA	T4,T4
	SETZ	T4,		;GET A NULL
	CAMN	CM,SAVEAC+1	;IS THE CURSOR NEXT TO THE CHARACTER?
	JRST	DELCT1		;YES - DELETE THE CHARACTER
	IDPB	T4,SAVEAC	;NO - DELETE THE TAB
	MOVSI	T1,(BYTE (7) 11)
	MOVEM	T1,DELBUF	;NOTE THAT THE DELETED CHARACTER WAS THE TAB
	JRST	CLSLNL		;RE-DISPLAY THE REST OF THE LINE AND LOOP

DELCT1:	DPB	T4,PT		;DELETE THE CHARACTER
	SOJA	CM,CLSNP3	;FINISH UP THE DISPLAY AND LOOP

;HERE TO REMOVE CHARACTERS FROM THE BUFFER

CLOSSP::TRNE	F,RDO		;IS FILE READ-ONLY?
	JRST	RDOERR		;YES - COMMAND IS ILLEGAL
	TLNN	F,ENT		;IS THERE A PARAMETER TYPED?
	JRST	CLSNPM		;NO - USE THE ONE ALREADY SET UP
	MOVE	T4,ADDSPC	;SET UP LAST TIME'S NOMINAL
	MOVEM	T4,PARG1
CLSSP1:	PUSHJ	P,PEEL.1	;READ NEW PARM, IF ANY
	MOVE	T4,PARG1	;GET SPACES TO DELETE
	TRNE	F,CMV		;DOING CURSOR MOVEMENT?
	PUSHJ	P,SPSCUR	;YES - HANDLE THINGS A LITTLE DIFFERENTLY
	MOVEM	T4,ADDSPC	;SAVE NEW NOMINAL
	PUSHJ	P,ERASPM	;ERASE PARAMETER
	TRZ	F,CMV		;CLEAR CURSOR MOVE FLAG (IF COMING FROM ERASWD)
	TLNE	TM,XCI		;INITIALIZING FOR AN EXECUTE?
	JRST	LOOP		;YES - DONE NOW

CLSNPM::SKIPG	T1,ADDSPC	;GOT ANYTHING TO DELETE?
	JRST	CLOSP1		;NO - DONE
CLSNP0:	SOS	ISVCNT		;YES - DECREMENT INCREMENTAL SAVE COUNTER
	TLZ	F,PCM		;CANCEL THE PICK-CLOSE MARK, IF ANY
	MOVEM	T1,ADDSPS	;SET UP THE VALUE
	TLO	F,CHG		;SAY FILE IS MODIFIED
CLSNP1:	PUSHJ	P,MAKCPT	;RE-MAKE CHARACTER POINTER
	SETZM	NUMCHR		;ASSUME A TAB WON'T BE BROKEN
	CAIE	T3,11		;IS CHARACTER AT CURSOR A TAB?
	JRST	CLSNP2		;NO - CONTINUE
	MOVE	T1,TABSPC	;YES - ADD SPACES TO LEFT OF TAB, AFTER CLOSE
	MOVEM	T1,NUMCHR

CLSNP2:	MOVE	PT,CHRPTR
	MOVE	T4,ADDSPS	;GET NUMBER OF SPACES TO CLOSE
	PUSHJ	P,WRTNUL	;NULL OUT THAT MANY CHARACTERS
	MOVEM	T4,WRTNUM	;SAVE SIZE OF LEFTOVER, IF IT'S SHORT
	SKIPE	NUMCHR		;WANT TO ADD SPACES FOR A BROKEN TAB?
	PUSHJ	P,MAKSPC	;YES - DO IT
	MOVE	T4,ADDSPS	;GET NUMBER OF SPACES TO CLOSE
	SUB	T4,WRTNUM	;MINUS UNNEEDED OVERAGE
	SKIPE	WRTNUM		;DELETE PAST THE END OF THE LINE?
	JRST	CLSN2A		;YES - JUST CLEAR TO END OF LINE IF POSSIBLE
CLSNP3:	SKIPE	T3,DSP(TM)	;CAN TERMINAL CLOSE SPACES ON ITS OWN?
	PUSHJ	P,CLSSPI	;YES - LET IT (SKIP RETURNS)
	PUSHJ	P,CLOSP0	;NO - REWRITE THE LINE CURSOR IS ON
CLSNP4:	SOSGE	ADDSLN		;WANT TO DO IT WITH ANOTHER LINE?
	JRST	CLOSP1		;NO - JUST GET ANOTHER COMMAND
	TLO	F,XPC!XPL	;YES - RE-MAKE SOME POINTERS
	AOJA	RW,CLSNP1	;AND DO THE SAME WITH THE NEXT LINE

CLSN2A:	SKIPN	CLN(TM)		;CAN TERMINAL CLEAR TO END OF LINE?
	JRST	CLSNP3		;NO - DO IT SOME OTHER WAY
	PUSHJ	P,POSCUR	;YES - RE-POSITION THE CURSOR
	MOVE	T1,CLN(TM)	;CLEAR TO END OF LINE
	PUSHJ	P,PUTSEQ
	JRST	CLSNP4		;AND FINISH OFF

CLOSP0:	SKIPE	NUMCHR		;STARTED WITH A TAB?
	PUSHJ	P,MAKCK1	;YES - MAKE SURE THE CURSOR POINTER IS RIGHT
	JRST	DISLIN		;RE-WRITE REST OF LINE THE CURSOR IS ON; RETURN

CLOSP1:	SOSG	SQZCNT		;TIME TO DO A SQUEEZE?
	PUSHJ	P,SQUEZW	;YES - REMOVE ALL NULL WORDS
	JRST	OPNSPE		;FINISH UP AND GET ANOTHER COMMAND

;HERE FOR CURSOR MOVE OPENSP OR CLOSSP - COUNT LINES AND SPACES

SPSCUR:	MOVEM	T4,ADDSLN	;SAVE LINES TO WORK WITH
	SKIPN	T4,PARG2	;GET NUMBER OF SPACES - ANY?
	MOVE	T4,ADDSPC	;NO - USE CURRENT NOMINAL
	POPJ	P,

;**********************************************************************
;HERE TO TAKE LINES FROM THE BUFFER AND PUT THEM IN THE PICK BUFFER

PICK::	MOVE	T4,PICKLN	;SET UP LAST TIME'S NOMINAL
	MOVEM	T4,PARG1
	PUSHJ	P,PEEL.1	;READ NEW PARM, IF ANY
	MOVE	T4,PARG1	;GET LINES TO PICK
	JUMPE	T1,[SETZM PICKLN    ;IF GOT A TOKEN, READ ZERO lINES
		    MOVEM T4,PICKSP ;AND GIVEN NUMBER OF SPACES
		    JRST  PICK0]    ;CONTINUE
	MOVEM	T4,PICKLN	;SAVE AS NEW NOMINAL
	TRNE	F,CMV		;CURSOR MOVEMENT?
	JRST	[MOVE  T1,PARG2    ;YES - GET SPACES TO PICK, TOO
		 MOVEM T1,PICKSP   ;IF NO LINES, COUNT SPACES FROM CURSOR
		 JUMPE T4,PICK0
		 ADD   T1,SAVPOS+1 ;IF SOME LINES, COUNT FROM LEFT MARGIN
		 ADD   T1,SL
		 MOVEM T1,PICKSP
		 JRST  PICK0]
	SETZM	PICKSP		;IF NO CURSOR MOVE, CLEAR EXTRA SPACES
PICK0:	PUSHJ	P,ERASPM	;ERASE PARAMETER
	TLNE	TM,XCI		;INITIALIZING FOR AN EXECUTE?
	JRST	LOOP		;YES - DONE NOW

PIKNPM::PUSHJ	P,MAKCPT	;RE-MAKE CURSOR POINTER
	TLNE	F,PCM		;HAS A MARK BEEN MADE?
	JRST	PIKMRK		;YES - DO THINGS DIFFERENTLY
	MOVE	T1,T3		;SAVE CHARACTER AT CURSOR
	MOVE	PT,CHRPTR	;GET CURRENT CURSOR POSITION
	PUSHJ	P,PIKGPT	;SET UP THE POINTER TO THE PICK BUFFER
	SETZ	T2,		;CLEAR COUNT (IN CASE THERE AREN'T ANY LINES)
	SKIPG	T4,PICKLN	;GET NUMBER OF LINES TO PICK - ANY?
	JRST	PICK3		;NO - SEE IF WANT TO PICK SPACES

	CAIE	T1,11		;GOT A TAB AT THE CURSOR?
	JRST	PICK1A		;NO - SKIP THIS
	MOVE	T2,PT		;GET CURSOR PTR AGAIN FOR SCRATCH
	ILDB	T1,T2		;GET CHARACTER CURSOR POINTS TO
	CAIE	T1,11		;FOUND THE TAB?
	JRST	.-2		;NO - KEEP LOOKING
	SKIPG	TABSPC		;YES - AT BEGINNING OF TAB?
	JRST	PICK1A		;YES - DON'T TOUCH THE TAB, THEN
	MOVE	PT,T2		;WITHIN - POINT AFTER TAB
	MOVE	T2,TABSIZ	;GET TAB'S SIZE TO RIGHT OF CURSOR
	SUB	T2,TABSPC
	MOVEM	T2,SAVEAC	;SAVE COUNT FOR A WHILE
	MOVEI	T1," "		;PUT SOME SPACES IN THE PICK BUFFER
	IDPB	T1,T3
	SOJG	T2,.-1
	SKIPA	T2,SAVEAC	;RESTORE COUNT OF SPACES PUT IN AND SKIP

PICK1A:	SETZ	T2,		;CLEAR COUNT OF CHARACTERS PICKED
PICK1:	CAMN	EN,PT		;AT END OF USEABLE BUFFER?
	JRST	PIKPAD		;YES - PAD IN THE REMAINING <CRLF>S
	CAMN	T3,[010700,,PIKBUF+PCBSIZ-1]
	PUSHJ	P,PIKOVF	;WRITE TO DISK ON PICK BUFFER OVERFLOW
	ILDB	T1,PT		;GET A CHARACTER
	JUMPE	T1,PICK1	;SKIP, IF NULL
	IDPB	T1,T3		;SAVE IT IN THE PICK BUFFER
	CAIE	T1,15		;CARRIAGE RETURN?
	AOJA	T2,PICK1	;NO - IGNORE IT

	CAMN	T3,[010700,,PIKBUF+PCBSIZ-1]
	PUSHJ	P,PIKOVF	;WRITE TO DISK ON PICK BUFFER OVERFLOW
	ILDB	T1,PT		;YES - PICK UP THE <LF>
	IDPB	T1,T3		;SAVE IT IN THE PICK BUFFER
	ADDI	T2,2		;COUNT IT
	CAIE	T1,12		;IS IT REALLY?
	JRST	PICK1		;NO - IT'S NOT THE END OF THE LINE
	SOJG	T4,PICK1	;YES - LOOP THROUGH DESIRED NUMBER OF LINES
PICK3:	ADDM	T2,PIKCNT	;SAVE COUNT OF CHARACTERS PICKED
	SKIPLE	T4,PICKSP	;DONE WITH LINES - GOT ANY SPACES?
	PUSHJ	P,PIKSPS	;YES - PICK THEM, TOO
PICK4:	SKIPE	APPFLG		;APPENDING?
	MOVEM	T3,APPFLG	;YES - SAVE THE LATEST POINTER
	SETZ	T1,		;DONE - END PICK BUFFER WITH A NULL
	IDPB	T1,T3
IFN TOPS10,<
	IDPB	T1,T3		;CLEAR OUT ENTIRE LAST WORD
	IDPB	T1,T3
	IDPB	T1,T3
	IDPB	T1,T3
>
	HRRZ	T3,T3		;GET BUFFER ENDING ADDRESS
	CAIL	T3,PIKBUF+PCBSIZ-400
	SETOM	INDFLG		;IF PICK IS LARGE SAY TAIL OF BUFFER FRAGGED
	TRNN	F,POV		;HAS BUFFER OVERFLOWED?
	JRST	PICK5		;NO - FINISH OFF
	SETOM	INDFLG		;YES - TAIL OF BUFFER IS FRAGGED
IFN TOPS10,<
	MOVNI	T1,-PIKBUF(T3)	;SET RH T1 = - [(T3) - PIKBUF]
	HRLM	T1,PIKCCL	;SET TO OUTPUT THAT MANY WORDS
>
	PUSHJ	P,PIKOV1	;WRITE OUT THE LAST PIECE
IFN TOPS10,<
	MOVNI	T1,PCBSIZ	;RESTORE FULL BUFFER SIZE
	HRLM	T1,PIKCCL	;  TO CHANNEL COMMAND
>
	PUSHJ	P,PIKOVE	;CLOSE THE DISK FILE
PICK5:	TRNN	F,RST		;WANT TO RESTORE THE NOMINAL PARAMETERS?
	JRST	PICK6		;NO - SKIP THIS
	MOVEI	T1,1
	MOVEM	T1,PICKLN	;YES - SET BACK TO ONE LINE
	SETZM	PICKSP		;  AND NO SPACES
PICK6:	TLZE	F,PCM		;WAS THERE A MARK?
	PUSHJ	P,DISPLL	;YES - RE-DISPLAY THE SCREEN
	PUSHJ	P,POSCUR	;RE-POSITION THE CURSOR
	JRST	LOOP		;AND GET ANOTHER COMMAND

;SUBROUTINE TO SET UP T3/PICK POINTER. CLEARS THE CHARACTER COUNT IFF
;THE POINTER POINTS TO THE START OF THE BUFFER AND POV IS NOT SET
;ALSO, IF BUFFER HAS OVERFLOWED, RE-OPENS DISK FILE FOR APPENDING
;SAVES T1; USES T2

PIKGPT:	SKIPN	T3,APPFLG	;GET APPEND POINTER - ANY?
	SKIPA	T3,[POINT 7,PIKBUF] ;NO - POINT TO START OF BUFFER
	CAMN	T3,[POINT 7,PIKBUF] ;YES - POINTING TO START OF BUFFER?
	JRST	PIKGPS		;YES - CLEAR COUNT AND RETURN
	TRNN	F,POV		;NO - HAS PICK BUFFER OVERFLOWED?
	POPJ	P,		;NO - DONE
	HRROI	T2,PIKFIL	;YES - OPEN THE FILE FOR APPENDING
IFN TOPS10,<
	MOVEM	T1,SAVEAC	;SAVE AC T1
	PUSHJ	P,SETIN		;OPEN IT FOR INPUT
	HLRO	T3,T1		;SAVE NEGATIVE FILE SIZE
	PUSHJ	P,SETOU1	;OPEN FOR OUTPUT, TOO
	MOVN	T1,T3		;GET POSITIVE FILE SIZE
	LSHC	T1,-7		;MAKE IT A BLOCK NUMBER
	TLNN	T2,774000	;END EXACTLY ON A BLOCK BOUNDARY?
	AOJA	T1,PIKGPB	;YES - DON'T NEED TO READ ANYTHING
	AOJ	T1,		;NO - READ LAST BLOCK OF FILE
	USETI	5,(T1)
	INPUT	5,PKACCL	;READ IT
	USETO	5,(T1)		;PREPARE TO WRITE THE LAST BLOCK, TOO
	MOVN	T3,T3		;GET NUMBER OF FULL WORDS IN THE FILE
	ANDI	T3,177
	ADD	T3,[POINT 7,PIKBUF-1] ;MAKE IT A POINTER
	ILDB	T1,T3		;MAKE IT POINT AFTER THE DATA
	JUMPN	T1,.-1
	ADD	T3,[70000,,0]	;BACK UP BEFORE THE NULL
	CAIGE	T3,0
	SUB	T3,[430000,,1]
	MOVE	T1,SAVEAC	;RESTORE AC T1
>
IFE TOPS10,<
	MOVEM	T1,PIKJFN	;SAVE T1
 	MOVE	T1,[GJ%SHT]	;OPEN THE PICK BUFFER FOR APPENDING
	GTJFN
	  HALTF
	MOVE	T2,[7B5+OF%APP]
	OPENF
	  HALTF
	EXCH	T1,PIKJFN	;RESTORE T1 AND SAVE JFN
	MOVE	T3,[POINT 7,PIKBUF] ;POINT TO START OF BUFFER
>
	POPJ	P,		;DONE

PIKGPS:	TRZ	F,POV		;SAY PICK BUFFER HASN'T OVERFLOWED (SO FAR)
	SETZM	PIKCNT		;CLEAR COUNT OF CHARACTERS PICKED
	POPJ	P,		;DONE

IFN TOPS10,<
PIKGPB:	MOVE	T3,[POINT 7,PIKBUF] ;POINT TO START OF BUFFER
	POPJ	P,		;DONE
>
;HERE IF PICK EXTENDS BEYOND FILE, TO PAD OUT WITH EXTRA <CR>S
;(IE, YOU ALWAYS GET THE NUMBER OF LINES YOU ASK FOR)

PIKPAD:	CAMN	T3,[010700,,PIKBUF+PCBSIZ-1]
	PUSHJ	P,PIKOVF	;WRITE TO DISK ON PICK BUFFER OVERFLOW
	MOVEI	T1,15		;THEN SAVE A CARRIAGE RETURN
	IDPB	T1,T3
	CAMN	T3,[010700,,PIKBUF+PCBSIZ-1]
	PUSHJ	P,PIKOVF	;WRITE TO DISK ON PICK BUFFER OVERFLOW
	MOVEI	T1,12		;THEN SAVE A LINEFEED
	IDPB	T1,T3
	ADDI	T2,2		;COUNT THE <CRLF>
	SOJG	T4,PIKPAD	;CONTINUE THROUGH ALL LEFTOVER LINES
	JRST	PICK3		;THEN FINISH OFF

;HERE TO PICK (T4) EXTRA SPACES AFTER THE LINES

PIKSPS:	TLZ	F,FLG		;DON'T NULL OUT THE PICKED CHARACTERS
	PUSHJ	P,SPCBFZ	;PICK (T4)S WORTH OF CHARACTERS AND RETURN
	MOVE	T1,SPCCNT	;GET COUNT OF CHARACTERS
	ADDM	T1,PIKCNT	;ADD TO TOTAL COUNT
	POPJ	P,		;DONE

;HERE IF MARK WAS MADE - PICK FROM STARTING CHARACTER TO (MRKPTR)
;note: does nothing about starting or ending in a tab

PIKMRK:	PUSHJ	P,MRKSET	;SET UP TO USE THE MARK
	PUSHJ	P,PIKGPT	;SET UP THE POINTER TO THE PICK BUFFER
	SETZB	T2,T4		;CLEAR COUNT OF CHARACTERS; GET A NULL
PIKMK1:	CAMN	PT,MRKPTR	;AT END OF THE PICK?
	JRST	PIKMKE		;YES - FINISH OFF
	CAMN	T3,[010700,,PIKBUF+PCBSIZ-1]
	PUSHJ	P,PIKOVF	;WRITE TO DISK ON PICK BUFFER OVERFLOW
	ILDB	T1,PT		;GET A CHARACTER
	JUMPE	T1,PIKMK1	;SKIP, IF NULL
	IDPB	T1,T3		;SAVE IT IN THE PICK BUFFER
	AOJA	T2,PIKMK1	;COUNT CHARACTER AND LOOP

PIKMKE:	ADDM	T2,PIKCNT	;SAVE COUNT OF CHARACTERS PICKED
	TLNN	F,PCM		;WANT TO RE-DISPLAY THE SCREEN?
	PUSHJ	P,MRKRES	;NO - REPAIR THE SCREEN AS IT IS
	JRST	PICK4		;GO FINISH OFF, EITHER WAY

;SUBROUTINE FOR OVERFLOW OF PICK BUFFER - SAVE ON DISK; SET POV FLAG
;USES T1, T2; RESETS T3

PIKOVF:	SETZ	T1,		;SAVE A NULL AT END OF PICK BUFFER
	IDPB	T1,T3
	TROE	F,POV		;SET PICK OVERFLOW FLAG - ALREADY SET?
	JRST	PIKOV1		;YES - FILE ALREADY OPEN
	PUSH	P,T2		;SAVE AN AC
	HRROI	T2,PIKFIL
IFN TOPS10,<
	PUSHJ	P,SETDEL	;DELETE OLD .TMP FILE
>
	PUSHJ	P,SETOUT	;SET UP THE PICK OUTPUT FILE
	MOVEM	T1,PIKJFN
	JRST	PIKOV2

PIKOV1:	PUSH	P,T2		;SAVE AN AC
IFN TOPS10,<
PIKOV2:	OUTPUT	5,PIKCCL	;WRITE OUT THE PICK BUFFER
>
IFE TOPS10,<
	MOVE	T1,PIKJFN
PIKOV2:	HRROI	T2,PIKBUF	;WRITE OUT THE PICK BUFFER
	SETZ	T3,
	SOUT
>
	MOVE	T3,[010700,,PIKBUF-1] ;START THE BUFFER AFRESH
	POP	P,T2		;RESTORE AC
	POPJ	P,		;CONTINUE

IFN TOPS10,<
PIKOVE:	CLOSE	5,
	RELEAS	5,		;FINISH OFF THE FILE
	POPJ	P,		;DONE
>
IFE TOPS10,<
PIKOVE:	MOVE	T1,PIKJFN	;GET FILE HANDLE
	JRST	SETTMP		;MAKE IT TEMPORARY, CLOSE IT, AND RETURN
>
;**********************************************************************
;HERE TO PUT THE CONTENTS OF THE PICK BUFFER INTO THE BUFFER
;HERE, SPECIFICALLY, TO DO AN IN-LINE PUT: PUT TEXT IN THE MIDDLE OF A LINE

PUT::	TRNE	F,RDO		;IS FILE READ-ONLY?
	JRST	RDOERR		;YES - COMMAND IS ILLEGAL
	SOS	ISVCNT		;DECREMENT INCREMENTAL SAVE COUNTER
	SETZM	PIKJFN		;ASSUME NOT READING FROM DISK
	TLO	F,INS		;LET LINE BE EXTENDED IF NECESSARY
	PUSHJ	P,MAKCPT	;RE-MAKE CURSOR POSITION
	TLZ	F,INS!PCM
	CAIN	T3,11		;IS CHARACTER AT CURSOR A TAB?
	PUSHJ	P,RPLTAB	;YES - REPLACE IT WITH SPACES
	MOVE	T3,[010700,,PIKBUF-1]
	MOVEM	T3,PUTPTR	;ASSUME WILL READ FROM PUT BUFFER
	TLNN	F,ENT		;IS THERE A PARAMETER TYPED?
	JRST	PUTNPM		;NO - USE THE PICK BUFFER
	PUSHJ	P,PELS.1	;GET STRING TO PUT, IF ANY
	JUMPE	T1,PUTCLS	;IF ENTER-PUT TYPED GO USE THE CLOSE BFR
	TRZ	F,POV		;IF IMMEDIATE, BUFFER CAN'T OVERFLOW
	SETZM	APPFLG		;  AND APPENDING MUST BE TURNED OFF
	MOVEM	T1,PIKCNT	;SAVE SIZE OF STRING
	MOVEM	T1,NUMCHR	;SAVE AS NUMBER OF CHARACTERS TO ADD
	PUSHJ	P,ERASPM	;CLEAN THE SCREEN UP
	TLNE	TM,XCI		;INITIALIZING FOR AN EXECUTE?
	JRST	LOOP		;YES - DONE NOW
	TLO	F,CHG!WRH	;SET TO READ FROM THE PICK BUFFER
	PUSHJ	P,MAKCPT	;RE-MAKE CURSOR POSITION, IF CURSOR MVMT USED
	SKIPN	T1,PIKCNT	;GET COUNT OF CHARACTERS PICKED - ANY?
	JRST	PUTERR		;NO - ERROR
	PUSHJ	P,MAKCHR	;YES - GO PUT THEM IN

;HERE FOR AN IN-LINE PUT (IE, NO <CRLF>S IN THE BUFFER)

PUT0:	TLZE	F,XPL		;IS LINE POINTER O.K.?
	PUSHJ	P,MAKLPT	;NO - RE-MAKE IT
	MOVE	T4,NUMCHR	;GET DISTANCE TO OPEN
IFN FTIMD,<
	SKIPN	IMO(TM)		;DOES THE TERMINAL HAVE INSERT MODE?
>
	SKIPE	ISP(TM)		;CAN TERMINAL OPEN SPACES ON ITS OWN?
	PUSHJ	P,OPNSPI	;YES - OPEN UP THE LINE (SKIP RETURN)
	JRST	PUT0D		;NO - REWRITE THE LINE CURSOR IS ON
	PUSHJ	P,POSCUR	;GET BACK TO START OF NEWLY-OPENED SPACE
	AOS	T1,PUTPTR	;WRITE PICK OR CLOSE BUFFER THERE
	PUSHJ	P,PUTSTS
	CAME	RW,LPP.1	;PUTTING ON BOTTOM LINE?
	JRST	DISCUR		;NO - RE-DISPLAY THE CURSOR AND LOOP
	TLZE	F,FNC		;YES - IS FENCE UP?
	PUSHJ	P,CLRLNA	;YES - ERASE IT
	JRST	DISCUR		;THEN RE-DISPLAY THE CURSOR AND LOOP

PUT0D:	PUSHJ	P,DISLIN	;TERMINAL CAN'T HELP - RE-DO REST OF LINE
	CAMN	RW,LPP.1	;PUTTING ON BOTTOM LINE?
	TLZ	F,FNC		;YES - IF FENCE WAS UP, IT AIN'T NO MO
	JRST	DISCUR		;RE-POSITION CURSOR AND RETURN

;HERE TO PUT OLD CONTENTS OF PICK BUFFER

PUTNPM::SKIPN	T1,PIKCNT	;GET COUNT OF CHARACTERS PICKED - ANY?
	JRST	PUTERR		;NO - ERROR
	MOVEM	T1,NUMCHR	;SAVE AS NUMBER OF CHARACTERS TO ADD
	SOS	ISVCNT		;DECREMENT INCREMENTAL SAVE COUNTER
	TLO	F,CHG!WRH	;SET TO READ FROM THE PICK BUFFER
	TRNN	F,POV		;WANT TO READ OFF DISK?
	JRST	PUTNP2		;NO - READ FROM BUFFER
	HRROI	T2,PIKFIL
	PUSHJ	P,SETIN		;YES - SET FILE UP
	MOVEM	T1,PUTJFN	;SAVE JFN FOR MAKSPC
PUTNP2:	SETZM	MAKLNS		;CLEAR NUMBER OF <CRLF>S IN BUFFER
	PUSHJ	P,MAKCHR	;PUT THE BUFFER
	SKIPN	T4,MAKLNS	;ARE THERE <CRLF>S IN THE PICK BUFFER?
	JRST	PUT0		;NO - JUST REWRITE ONE LINE
	TLO	F,XPB		;YES - BOTTOM POINTER IS BAD
	PUSHJ	P,OPENLD	;OPEN UP, SOMEHOW **NOTE: MAY NOT RETURN**
	PUSHJ	P,POSCUR	;POSITION TO START OF PUT
	MOVE	T4,MAKLNS	;GET NUMBER OF LINES TO DISPLAY
	JUMPN	CM,PUTNP3	;JUMP IF NOT AT START OF A COLUMN
	LDB	T1,MAKPTR	;GET LAST CHARACTER PUT
	CAIE	T1,12		;END OF LINE?
PUTNP3:	AOJ	T4,		;DO ONE MORE LINE IF START OR END W/IN LINE

	MOVE	T1,LPP(TM)	;FIND NUMBER OF LINES BELOW CURSOR
	SUB	T1,RW
	CAMG	T1,T4		;IS PUT LONGER THAN THAT?
	MOVE	T4,T1		;YES - DISPLAY ONLY WHAT WILL FIT

	MOVE	PT,CHRPTR	;DISPLAY FROM CURSOR POSITION
	PUSHJ	P,DISPLY
;	TLZN	F,FNC		;WAS THE FENCE ON THE SCREEN?
;	JRST	DISCUR		;NO - RE-POSITION CURSOR AND LOOP
	PUSHJ	P,FIXBLW	;YES - RESTORE IT IF IT'S STILL THERE
	JRST	DISCUR		;RE-POSITION CURSOR AND LOOP

;HERE TO PUT THE CONTENTS OF THE CLOSE BUFFER

PUTCLS:	MOVE	T1,[010700,,CLSBUF-1]
	MOVEM	T1,PUTPTR	;SET TO READ FROM CLOSE BUFFER
	PUSHJ	P,ERASPM	;ERASE PARAMETER
	TLO	F,CHG!WRH	;SET TO READ FROM THE CLOSE BUFFER
	TRNN	F,COV		;WANT TO READ OFF DISK?
	JRST	PUTCS1		;NO - READ FROM BUFFER
	HRROI	T2,CLSFIL
	PUSHJ	P,SETIN		;YES - SET FILE UP
	MOVEM	T1,PUTJFN	;SAVE JFN FOR MAKSPC
PUTCS1:	SKIPG	T1,CLSCNT	;GET COUNT OF CHARS IN BUFFER - ANY?
	JRST	PUCERR		;NO - ERROR
	MOVEM	T1,NUMCHR	;YES - SAVE AS NUMBER OF CHARACTERS TO ADD
	JRST	PUTNP2		;GO PUT THEM IN

PUCERR:	MOVEI	T1,[ASCIZ /#######Close buffer is empty/]
	JRST	ERROR
PUTERR:	MOVEI	T1,[ASCIZ /########Put buffer is empty/]
	JRST	ERROR

;**********************************************************************
;HERE TO INSERT A REAL TAB IN THE FILE - SAME AS IF USER TYPED E-C-C I

REALTB::MOVEI	T1,11		;GET A TAB
	SETO	DO,		;NOTE THAT A COMMAND IS ACTIVE
	JRST	ALPNU1		;TREAT IT LIKE E-C-C I

;**********************************************************************
;HERE TO MARK POSITION FOR PICK OR CLOSE-LINES. THE NEXT SUCH COMMAND
;WILL TAKE TEXT FROM THE MARK TO THE CURSOR POSITION.

MARK::	PUSHJ	P,MAKCPT	;GET A CORRECT CURSOR POINTER
	DMOVE	T1,LINPTR	;SAVE LINE AND CURSOR POINTER FOR LATER
	DMOVEM	T1,MRLPTR
	MOVE	T1,DISPTR	;SAVE CURRENT DISPLAY POINTER
	MOVEM	T1,MRKPTR
	TLO	F,PCM		;SET MARK FLAG
	DMOVEM	RW,SVPMRK	;SAVE STARTING POSITION
	PUSHJ	P,MRKCUR	;MARK THE CURSOR POSITION
	MOVEM	T3,SVPMRK+2	;SAVE THE CHARACTER MARKED
	PUSHJ	P,POSCUR	;RE-POSITION AND OUTPUT
	JRST	LOOP		;THAT'S ALL

;HERE ON ENTER MARK, WHICH CANCELS THE MARK

MRKARG::TLZN	F,PCM		;CANCEL THE MARK - GOT ONE?
	JRST	TBCLRX		;NO - REPAIR SCREEN AND GO HOME
	DMOVE	T1,MRLPTR	;RESTORE CURSOR AND LINE POINTERS
	DMOVEM	T1,LINPTR
	MOVE	T1,MRKPTR	;RESTORE THE OLD DISPLAY POINTER
	EXCH	T1,DISPTR
	CAMN	T1,DISPTR	;HAS DISPLAY POINTER CHANGED?
	JRST	MRKAG0		;NO - REPAIR THE SCREEN AS IT IS
	DMOVE	RW,SVPMRK	;YES - RESTORE SAVED ROW AND COLUMN
	TLZ	F,ENT!XPL!XPC	;CANCEL THE ENTER; SAY CUR, LINE PTRS ARE GOOD
	TLO	F,XPB		;BUT BOTTOM POINTER IS NOT
	JRST	DISALL		;RE-DISPLAY THE SCREEN AND LOOP

MRKAG0:	PUSHJ	P,ERASPM	;FIX UP THE SCREEN
	DMOVE	RW,SVPMRK	;RESTORE SAVED ROW AND COLUMN
	PUSHJ	P,MRKAG1	;DE-BLIP THE MARK
	JRST	LOOP		;RE-POSITION AND LOOP

MRKAG1:	MOVE	T1,SVPMRK+2	;GET CHARACTER MARKED
	MOVEM	T1,CHRCUR
	JRST	RESTPM+2	;DE-BLIP THE MARK AND RETURN

MRKRES:	EXCH	RW,SVPMRK	;DE-BLIP THE MARK AT THE STARTING POINT
	EXCH	CM,SVPMRK+1
	PUSHJ	P,MRKAG1
	DMOVE	RW,SVPMRK	;GET THE REAL POSITION BACK
	POPJ	P,		;DONE

;**********************************************************************
;HERE TO CHANGE THE CASE OF STUFF AT THE CURSOR. IF THE SWITCH
;/RAISE IS ON THE LETTER WILL BECOME UPPER; IF /NORAISE, LOWER

CHGCAS::TRNE	F,RDO		;IS FILE READ-ONLY?
	JRST	RDOERR		;YES - COMMAND IS ILLEGAL
	MOVE	T4,CASSPS	;GET LAST TIME'S NOMINAL
	TLNN	F,ENT		;IS THERE A PARAMETER TYPED?
	JRST	CASNPM		;NO - USE THE ONE ALREADY SET UP
	MOVEM	T4,PARG1
	PUSHJ	P,PEEL.1	;READ NEW PARM, IF ANY
	MOVE	T4,PARG1	;GET COUNT OF CHARACTERS
	TRNE	F,CMV		;CURSOR MOVEMENT?
	JRST	[MOVEM T4,CASLNS   ;YES - SAVE LINES TO WORK WITH
		 MOVE  T4,PARG2    ;GET REAL SPACES TO WORK WITH
		 SKIPN CASLNS	   ;GOT ANY LINES?
		 JRST  CASNP0	   ;NO - USE SPACES AS IS
		 ADD   T4,SAVPOS+1 ;YES - COUNT THEM FROM LEFT MARGIN
		 ADD   T4,SL
		 JRST  CASNP0]
	SETZM	CASLNS		;IF NO CURSOR MOVE, CLEAR EXTRA LINES
CASNP0:	MOVEM	T4,CASSPS	;SAVE SPACE COUNT AS NEW NOMINAL
	PUSHJ	P,ERASPM	;RESET ENTER MODE
	PUSHJ	P,POSCUR	;RE-POSITION THE CURSOR
	TLNE	TM,XCI		;INITIALIZING FOR AN EXECUTE?
	JRST	LOOP		;YES - DONE NOW
CASNPM::SKIPE	T1,CASLNS	;GET LINES TO WORK WITH
	MOVEI	T4,^D1000	;SET TO DO ENTIRE LINE
	JUMPLE	T4,DISCUR	;DONE IF GOT ZERO SPACES
	MOVEM	T1,CASLIN	;ELSE SAVE LINES IN A FRAGGABLE PLACE
	SOS	ISVCNT		;DECREMENT INCREMENTAL SAVE COUNTER
	MOVEM	T4,SAVEAC	;SAVE SPACE COUNT
	PUSHJ	P,MAKCPT	;GET A GOOD CHARACTER POINTER
	MOVE	T4,SAVEAC	;GET SPACE COUNT BACK
	TLO	F,CHG		;SAY FILE HAS BEEN CHANGED
	SKIPN	INVFLG		;WANT TO INVERT THE CASE?
	JRST	CASINV		;YES - GO DO IT
	SKIPE	UPCFLG		;NO - WANT LOWER CASE?
	JRST	CASUC0		;NO - MAKE IT UPPER CASE

;HERE TO CHANGE LOWER CASE TO UPPER

	MOVEI	PT,CASLC2	;YES - SET UP LC RETURN ADDRESS
CASLC1:	ILDB	T1,CHRPTR	;GET THE NEXT CHARACTER FROM THE FILE
	JUMPE	T1,CASENB	;IF NULL CHECK FOR END OF BUFFER
	CAIL	T1,"a"		;IS CHARACTER LOWER CASE?
	CAILE	T1,"z"
	JRST	CASSKP		;NO - JUST SKIP OVER IT
	HRRZI	T1,-40(T1)	;YES - CONVERT TO UPPER
	PUSHJ	P,CASSAV	;STORE AND OUTPUT THE CHANGED CHARACTER
CASLC2:	SOJG	T4,CASLC1	;HANDLE THE NEXT CHARACTER
	TLZ	F,LFF		;CLEAR RETURN-FROM-CURSOR-MOVE FLAG
CASEND:	TRNN	F,RST		;WANT TO RESTORE THE NOMINAL PARAMETER?
	JRST	DISCUR		;NO - POSITION CURSOR; DONE
	MOVEI	T1,1
	MOVEM	T1,CASSPS	;YES - SET IT BACK TO ONE CHARACTER
	SETZM	CASLNS		;  AND NO LINES
	JRST	DISCUR		;POSITION CURSOR; DONE

;HERE TO CHANGE UPPER CASE TO LOWER

CASUC0:	MOVEI	PT,CASUC2	;GET UPPER CASE RETURN ADDRESS
CASUC1:	ILDB	T1,CHRPTR	;GET NEXT CHARACTER FROM THE FILE
	JUMPE	T1,CASENB	;IF NULL CHECK FOR END OF BUFFER
	CAIL	T1,"A"		;IS CHARACTER UPPER CASE?
	CAILE	T1,"Z"
	JRST	CASSKP		;NO - JUST SKIP OVER IT
	MOVEI	T1,40(T1)	;YES - CONVERT TO LOWER
	PUSHJ	P,CASSAV	;SAVE AND OUTPUT THE CHARACTER
CASUC2:	SOJG	T4,CASUC1	;HANDLE THE NEXT CHARACTER
CASUC3:	TLZ	F,LFF		;CLEAR RETURN-FROM-CURSOR-MOVE FLAG
	JRST	CASEND		;DONE; GO FINISH UP

;HERE TO INVERT THE CASE: UPPER GOES TO LOWER AND VICE VERSA

CASINV:	MOVEI	PT,CASIV2	;GET INVERT CASE RETURN ADDRESS
CASIV1:	ILDB	T1,CHRPTR	;GET NEXT CHARACTER FROM THE FILE
	JUMPE	T1,CASENB	;IF NULL CHECK FOR END OF BUFFER
	CAIGE	T1,"A"		;IS CHARACTER UPPER CASE?
	JRST	CASSKP		;NO - JUST SKIP OVER IT
	CAILE	T1,"Z"
	JRST	CASIVL		;NO - CHECK FOR LOWER CASE
	MOVEI	T1,40(T1)	;YES - CONVERT TO LOWER
CASIL1:	PUSHJ	P,CASSAV	;SAVE AND OUTPUT THE CHARACTER
CASIV2:	SOJG	T4,CASIV1	;HANDLE THE NEXT CHARACTER
CASIV3:	TLZ	F,LFF		;CLEAR RETURN-FROM-CURSOR-MOVE FLAG
	JRST	CASEND		;DONE; GO FINISH UP

CASIVL:	CAIL	T1,"a"		;IS CHARACTER LOWER CASE?
	CAILE	T1,"z"
	JRST	CASSKP		;NO - JUST SKIP OVER IT
	HRRZI	T1,-40(T1)	;YES - CONVERT TO UPPER
	JRST	CASIL1		;AND CONTINUE

CASENB:	CAMN	EN,CHRPTR	;FOUND A NULL - AT END OF BUFFER?
	JRST	CASIV3		;YES - QUIT NOW
	AOJA	T4,@PT		;NO - LOOP

CASSAV:	DPB	T1,CHRPTR	;SAVE IT OVER THE OTHER ONE
	JUMPL	CM,CASSV1	;DONE IF OFF THE LEFT OF THE SCREEN
	TRNN	F,XCT		;EXECUTING,
	CAML	CM,CPL.1	;  OR OFF THE RIGHT SIDE?
	JRST	CASSV1		;YES - NO ECHO
	MOVEM	T1,SAVEAC	;NO - SAVE CHARACTER TO ECHO
	TLZE	F,LFF		;ALREADY POSITIONED?
	PUSHJ	P,POSCUR	;NO - POSITION, ALREADY
	MOVE	T1,SAVEAC	;GET CHARACTER BACK
	TYPCHA			;AND OUTPUT IT
CASSV1:	AOJA	CM,CPOPJ	;ADJUST COLUMN POSITION AND RETURN

CASSKP:	CAIN	T1,15		;END OF LINE?
	JRST	CASSKC		;MAYBE - CHECK IT OUT
	JUMPL	CM,CASSK2	;NO DISPLAY IF OFF THE LEFT OF THE SCREEN
	CAML	CM,CPL.1	;OFF THE RIGHT SIDE?
	AOJA	CM,@PT		;YES - NO DISPLAY EITHER
	CAIN	T1,11		;TAB?
	JRST	CASSKT		;YES - FIX COLUMN POSITION AND CHARACTER COUNT
CASSK1:	TLO	F,LFF		;FLAG THAT CURSOR HAS MOVED
CASSK2:	AOJA	CM,@PT		;AND CONTINUE

CASSKT:	ADD	T4,CM		;GOT A TAB - SUBTRACT ITS LENGTH FROM THE COUNT
	TRO	CM,7		;MOVE OVER TO TAB BOUNDARY
	SUB	T4,CM		;COMPLETE THE SUBTRACTION
	JRST	CASSK1		;BACK TO THE FLOW

CASSKC:	MOVE	T2,CHRPTR	;GET CHARACTER AFTER THE CARRIAGE RETURN
	ILDB	T1,T2
	CAIE	T1,12		;IS IT A LINEFEED?
	JRST	CASSK1		;NO - JUST SKIP OVER THE CR
	MOVEM	T2,CHRPTR	;YES - DON'T COUNT IT AS A CHARACTER
	MOVN	CM,SL		;MOVE TO THE NEXT LINE
	AOJ	RW,
	CAML	RW,LPP(TM)	;WORKING ON BOTTOM LINE?
	PUSHJ	P,CASROL	;YES - ROLL DOWN A LINE
	TLO	F,XPL!XPC!LFF	;LINE AND CHARACTER POINTERS ARE INVALID

	SOSGE	T1,CASLIN	;GOT MORE LINES TO DO?
	JRST	CASUC3		;NO - DONE
	MOVEI	T4,^D1000	;SET TO DO ONE MORE LINE
	JUMPN   T1,@PT		;JUMP IS THIS IS NOT THE LAST LINE
	SKIPE	T4,CASSPS	;ELSE GET NUMBER OF SPACES IN LAST LINE - ANY?
	AOJA	T4,@PT		;YES - GO DO LAST LINE
	JRST	CASUC3		;NO - DONE

CASROL:	MOVEI	T4,1		;ROLL UP ONE LINE
	MOVEM	T4,ROLLS
	PUSH	P,PT
	PUSHJ	P,ROLFW		;GO DO THE ACTUAL ROLLING
	POP	P,PT
	POPJ	P,

;**********************************************************************
;HERE TO DELETE THE FIRST CHARACTER FROM THE PARAMETER BUFFER

DELFIR::SETZ	T1,		;END PARAMETER BUFFER WITH A NULL
	MOVE	T2,PARPTR
	IDPB	T1,T2
	CAMN	T2,[POINT 7,PARBUF,6]
	JRST	LOOP		;NOTHING TO DO IF NOTHING IN BUFFER
	MOVE	PT,[POINT 7,PARBUF] ;ELSE POINT TO START OF THE BUFFER
	MOVE	T4,PT		;POINT TO FIRST AND SECOND CHARACTERS
	IBP	PT
DELFR1:	ILDB	T1,PT		;GET A CHARACTER
	IDPB	T1,T4		;SAVE IT IN THE PREVIOUS POSITION
	JUMPN	T1,DELFR1	;LOOP UNTIL NULL
	PUSHJ	P,ENTRMK	;MAKE THE MARK ON THE BOTTOM LINE
	JRST	RECAL1		;GO TO RECALL CODE TO FINISH UP

;**********************************************************************
;ERASE THE PREVIOUS WORD

ERASWD::TRNE	F,RDO		;IS FILE READ-ONLY?
	JRST	RDOERR		;YES - COMMAND IS ILLEGAL
	SOS	ISVCNT		;DECREMENT INCREMENTAL SAVE COUNTER
	TLO	F,XPC		;FORCE RE-MAKE OF CHARACTER POINTER
	PUSHJ	P,MAKCPT	;RE-MAKE IT
	CAIN	T3,15		;IS THE CURSOR AT OR BEYOND END OF THE LINE?
	PUSHJ	P,ERSWDL	;YES - POSITION TO END OF LINE
	MOVE	PT,CHRPTR	;GET CHARACTER POINTER
	JUMPE	CM,ERAWDE	;IF AT LEFT MARGIN MOVE TO END OF LINE
ERAWD0:	DMOVEM	RW,SAVPOS	;SAVE CURRENT POSITION
	TLO	F,CHG!XPC	;SAY CHARACTER POINTER BAD; FILE MODIFIED
	TLZ	F,PCM!FLG	;CANCEL THE PICK-CLOSE MARK, IF ANY
	IBP	PT		;MAKE THE BYTE POINTER RIGHT FOR DECREMENTING

ERAWD1:	PUSHJ	P,ERAGET	;GET NEXT-MOST-RECENT CHARACTER
	CAIN	T1,12		;LINEFEED?
	JRST	[PUSHJ P,ERAGET	   ;YES - GET (MAYBE) THE CARRIAGE RETURN
		 CAIE  T1,15	   ;IS IT?
		 SOJA  CM,ERAWD3   ;NO - TREAT JUST LIKE A NORMAL CHARACTER
		 JRST  ERAWDB]	   ;YES - END OF THE ERASE
	CAIN	T1,11		;TAB?
	TLOA	F,FLG		;YES - SET FLAG, COUNT IT AND LOOP
	CAIN	T1," "		;SPACE?
	SOJA	CM,ERAWD1	;YES - MOVE OVER IT
IFN TOPS10,<
	CAIGE	T1,"0"		;NUMERIC?
	JRST	ERAWDA		;NO - KEEP CHECKING
	CAIG	T1,"9"
	SOJA	CM,ERAWD2	;YES - PHASE TWO
ERAWDA:	CAIL	T1,"A"		;ALPHABETIC?
	CAILE	T1,"Z"
	SOJA	CM,ERAWDX	;NO - STOP ON THE SPECIAL CHARACTER
>
	SOJ	CM,
ERAWD2:	PUSHJ	P,ERAGET	;GET NEXT-MOST-RECENT CHARACTER
ERAWD3:	CAIGE	T1,"0"		;NUMERIC?
	JRST	ERAWD4		;NO - KEEP CHECKING
	CAIG	T1,"9"
	SOJA	CM,ERAWD2	;YES - MOVE OVER IT
ERAWD4:	CAIGE	T1,"A"		;ALPHABETIC?
	JRST	ERAWDX		;NO - STOP HERE
	CAIG	T1,"Z"
	SOJA	CM,ERAWD2	;YES - MOVE OVER IT

ERAWDX:	CAIGE	CM,0		;BACK TO THE START OF THE LINE?
	SETZ	CM,		;YES
	TLZE	F,FLG		;WERE ANY TABS FOUND?
	PUSHJ	P,ERAWDT	;YES - CM MUST BE MADE RIGHT
ERAWX1:	TRO	F,CMV		;PRETEND ALL THIS WAS CURSOR MOVEMENT
	MOVEI	DO,$DELSP	;AND THAT DELETE-SPACES WAS TYPED
	EXCH	RW,SAVPOS	;SWAP CURRENT AND STARTING POSITIONS
	EXCH	CM,SAVPOS+1
	PUSHJ	P,PEEL.1	;READ NEW PARM, IF ANY
	MOVE	T4,PARG1	;GET SPACES TO DELETE
	PUSHJ	P,SPSCUR	;YES - HANDLE THINGS A LITTLE DIFFERENTLY
	TRZ	F,CMV		;CLEAR CURSOR MOVE FLAG (IF COMING FROM ERASWD)
	SKIPN	T1,T4		;PUT SPACES TO DELETE IN THE RIGHT AC - ANY?
	JRST	DISCUR		;NO - DONE
	JRST	CLSNP0		;GO DO THE CLOSE-SPACES

ERAWDB:	SETZ	CM,		;MOVE TO THE BEGINNING OF THE LINE
	TLZ	F,FLG		;DON'T CARE IF A TAB WAS FOUND
	JRST	ERAWX1		;GO FINISH OFF

ERAWDT:	MOVE	T4,CHRPTR	;GET OLD CHARACTER POINTER
	MOVEM	PT,CHRPTR	;SAVE POINTER TO ENDING CHARACTER
	TLO	F,XPC!XPL
	PUSHJ	P,CALCML	;FIND WHERE CM REALLY IS
	  JFCL
	MOVEM	T4,CHRPTR	;RESTORE OLD POINTER
	POPJ	P,		;DONE

;HERE IF STARTING AT OR BEYOND THE END OF A LINE
;POSITION TO THE END OF THE LINE, THEN ERASE THE WORD
;(CALLED ALSO BY DELCHR)

ERSWDL:	PUSHJ	P,CALCML	;CALCULATE PROPER VALUE OF CM
	  JRST	POSCUR		;DON'T CARE IF THERE'S A SLIDE
	JRST	POSCUR		;POSITION THE CURSOR AND RETURN

;HERE IF STARTING AT START OF LINE - DELETE LAST WORD OF PREVIOUS LINE

ERAWDE:	SOJL	RW,ERAWE2	;MOVE UP A ROW - JUMP IF AT TOP
	PUSHJ	P,ERAGET	;BACK THE CHARACTER POINTER UP
	PUSHJ	P,ERAGET
	MOVEM	PT,CHRPTR
	PUSHJ	P,MAKLPT	;GET THE POINTER TO THAT ROW (IN LINPTR AND PT)
	PUSHJ	P,CALCCM	;FIND CHARACTER POSITION
	  JRST	ERAWD0
	JRST	ERAWD0

ERAWE2:	SETZB	RW,CM		;IF USER STARTED AT HOME
	JRST	DISCUR		;LEAVE HIM THERE

;SUBROUTINE TO GET THE NEXT-LATEST FILE CHARACTER

ERAGET:	ADD	PT,[70000,,0]	;GET NEXT-MOST-RECENT CHARACTER
	CAIGE	PT,0
	SUB	PT,[430000,,1]
	LDB	T1,PT
	JUMPE	T1,ERAGET	;SKIP IF NULL
	CAIL	T1,"a"		;LOWER CASE (MAYBE)?
	SUBI	T1,40		;YES - CONVERT TO (MAYBE) UPPER
	POPJ	P,		;DONE

;**********************************************************************
;RECOVER COMMAND - PUT THE CONTENTS OF THE DELETE BUFFER BACK IN THE FILE

RECOVR::PUSHJ	P,ERASPM	;CLEAN UP ENTER MODE
	TLO	F,INS!CHG	;LET LINE BE EXTENDED IF NECESSARY
	PUSHJ	P,MAKCPT	;MAKE SURE THE CURSOR POINTER IS RIGHT
	TLZ	F,INS!PCM
	SKIPN	T4,DELCNT	;GET SIZE OF THE DELETE BUFFER - ANY?
	JRST	DISCUR		;NO - NOTHING TO DO
	CAIN	T4,1		;WANT TO PUT IN ONE CHARACTER?
	JRST	RECOV1		;YES - HANDLE SPECIALLY
	MOVEM	T4,NUMCHR	;SAVE NUMBER OF CHARACTERS TO ADD
	MOVE	T1,[010700,,DELBUF-1]
	MOVEM	T1,PUTPTR	;SET TO READ FROM DELETE BUFFER
	TLO	F,WRH		;SET USE-BUFFER FLAG FOR MAKCHR
	JRST	PUTNP2		;GO PUT THEM IN

;HERE TO RECOVER ONE CHARACTER - SIMULATE INSERT-MODE TYPE-IN

RECOV1:	LDB	T1,[350700,,DELBUF] ;GET THE CHARACTER TO INSERT
	JRST	ALPIMD		;INSERT THE CHARACTER; DONE

;**********************************************************************
;HERE FOR THE SUBSTITUTE COMMAND - SEARCH FOR THE SEARCH KEY, REPLACE IT
;WITH THE SUBSTITUTE STRING; LOOP THE GIVEN NUMBER OF TIMES

SUBSTI::TRZE	F,CMV		;DID USER USE CURSOR MOVEMENT?
	JRST	SUMERR		;YES - ILLEGAL
	SETZB	T1,SUBNUM	;END BUFFER WITH A NULL
	IDPB	T1,PARPTR
	MOVE	T4,[POINT 7,PARBUF] ;GET POINTER TO PARAMETER BUFFER
SUBST0:	SETZB	T1,T3		;CLEAR THINGS FOR PEEL ROUTINES
	ILDB	T2,T4		;GET FIRST CHARACTER OF PARAMETER
	CAIL	T2,"a"		;LOWER CASE?
	SUBI	T2,40		;MAYBE - CONVERT TO UPPER
	CAIN	T2,"S"		;SET UP THE SEARCH KEY?
	JRST	SUBSRC		;YES - DO IT
	CAIN	T2,"R"		;SET UP THE SUBSTITUTE STRING?
	JRST	SUBSUB		;YES - DO IT

;HERE TO SET UP A NUMBER OF ITERATIONS

	PUSHJ	P,PEEL1+1	;READ (HOPEFULLY) A NUMBER
	JUMPE	T1,SUMERR	;ERROR IF TOKEN
	SKIPG	T1,PARG1	;ELSE GET NUMBER OF ITERATIONS - ANY?
	JRST	SUNERR		;NO - ERROR
	MOVEM	T1,SUBCNT	;YES - SAVE AS NEW NOMINAL
	MOVEM	T1,SUBNUM	;AND NOTE THAT IT'S NEW
	CAIE	T2,177		;END WITH A DELIMITER?
	JRST	SUBDUN		;NO - FINISH UP
	JRST	SUBST0		;YES - FIND WHAT'S NEXT

;HERE TO SET UP THE SUBSTITUTE KEY AS THE SEARCH KEY (SUBSRC)
; OR THE SUBSTITUTE STRING (SUBSUB)
;ENTER WITH T4/ POINTER TO START OF KEY IN PARBUF

SUBSRC:	MOVE	T2,[SRCKEY,,SROKEY]
	BLT	T2,SROKEY+7	;SAVE CURRENT KEY AS PREVIOUS ONE
	MOVE	T3,[POINT 7,SRCKEY]
	PUSHJ	P,PELST2	;GET SEARCH KEY
	MOVEM	T1,SRCKLN	;SAVE ITS LENGTH
	CAIE	T2,177		;END WITH A DELIMITER?
	JRST	SUBDUN		;NO - FINISH UP
	JRST	SUBST0		;YES - FIND WHAT'S NEXT

SUBSUB:	MOVE	T3,[POINT 7,SUBSTG]
	PUSHJ	P,PELST2	;GET SUBSTITUTE STRING
	MOVEM	T1,SUBSLN	;SAVE ITS LENGTH
	MOVE	T1,CM		;SAVE THE REAL CURSOR POSITION
	SETZ	CM,		;SEE HOW LONG THE STRING IS
	PUSHJ	P,SUBCB0	;(TO SEE IF THERE ARE ANY TABS IN IT)
	EXCH	T1,CM		;RESTORE THE REAL POSITION
	CAME	T1,SUBSLN	;ARE THERE TABS?
	MOVNS	SUBSLN		;YES - INDICATE WITH A NEGATIVE LENGTH
	CAIN	T2,177		;END WITH A DELIMITER?
	JRST	SUBST0		;YES - FIND WHAT'S NEXT (ELSE FALL TO FINISH)

;HERE TO FINISH WITH PARAMETERS - DO COMMAND ONLY IF ITERATIONS WERE GIVEN

SUBDUN:	PUSHJ	P,ERASPM	;ERASE THE PARAMETER FROM THE SCREEN
	TLNN	TM,XCI		;INITIALIZING FOR AN EXECUTE?
	SKIPN	SUBNUM		;NO - WAS A NUMBER OF ITERATIONS GIVEN?
	JRST	LOOP		;NO INIT, NO NUMBER - DONE

;HERE TO DO THE SUBSTITUTE FROM THE PARAMETERS SET UP ABOVE

SUBNPM::TRNE	F,RDO		;IS FILE READ-ONLY?
	JRST	RDOERR		;YES - COMMAND IS ILLEGAL
	SKIPG	T1,SUBCNT	;WANT TO DO ANY SUBSTITUTES?
	JRST	SUNERR		;NO - ERROR (SHOULDN'T HAPPEN)
	MOVEM	T1,SUBNUM	;YES - SAVE DECREMENTABLE NUMBER TO DO
	MOVEI	T2,1
	TRNE	F,RST		;WANT TO RESTORE THE NOMINAL PARAMETER?
	MOVEM	T2,SUBCNT	;YES - SET IT BACK TO ONE
	SETZM	SAVEAC+1	;CLEAR BOTTOM-LINE MESSAGE FLAG
	TLZ	F,PCM		;CANCEL THE PICK-CLOSE MARK, IF ANY
	TLO	F,CHG		;SAY FILE HAS CHANGED
	MOVEM	F,SAVEAC+10	;SAVE OLD SETTING OF XCT FLAG

SUBNP0:	PUSHJ	P,SRFNPM	;SEARCH FOR THE KEY
	MOVE	T4,SRCKLN	;NULL IT OUT
	SETZ	T2,
	MOVE	PT,CHRPTR
SUBNP1:	ILDB	T1,PT		;GET A CHARACTER
	JUMPE	T1,SUBNP1	;IGNORE IF NULL
	DPB	T2,PT		;ELSE NULL IT OUT
	CAIN	T1,15		;WAS IT A CARRIAGE RETURN?
	TLO	F,FLG		;YES - REMEMBER THAT FACT
	SOJG	T4,SUBNP1	;LOOP THROUGH ALL CHARACTERS

	SKIPN	T4,SUBSLN	;GET SIZE OF THE SUBSTITUTE STRING - ANY?
	JRST	SUBNP2		;NO - NOTHING TO DO
	MOVMM	T4,NUMCHR	;SAVE NUMBER OF CHARACTERS TO ADD
	MOVE	T1,[010700,,SUBSTG-1]
	MOVEM	T1,PUTPTR	;SET TO READ FROM SUBSTITUTE BUFFER
	TLO	F,WRH		;SET USE-BUFFER FLAG FOR MAKCHR
	PUSHJ	P,MAKCHR	;PUT THE STUFF IN
SUBNP2:	TLO	F,XPC		;MARK CURSOR POINTER AS INVALID
	SKIPE	SAVEAC+1	;WAS DISPLAY POINTER MOVED DURING LAST SEARCH?
	TROA	F,XCT		;YES - PRETEND EXECUTING TO TURN OFF DISPLAY
	PUSHJ	P,DISLIN	;NO - DISPLAY THE CHANGE THAT WAS MADE

	MOVE	T1,CM		;SAVE OLD CURSOR POSITION
	PUSHJ	P,SUBCTB	;MOVE CURSOR TO LAST CHARACTER OF SUB. STRING
	SOSG	SUBNUM		;GOT MORE TO DO?
	JRST	SUBNP3		;NO - DONE
	TLZN	F,FLG		;YES - TOOK OUT A CARRIAGE RETURN?
	SOJA	CM,SUBNP0	;NO - JUST LOOP
	PUSHJ	P,CCREOL	;YES - IF AT END OF FILE PUT THE CR BACK
	JUMPE	T2,SUBNP3	;DONE IF IT WAS END OF FILE
	SOJA	CM,SUBNP0	;ELSE LOOP

SUBNP3:	EXCH	T1,SAVEAC+10	;NO - GET SAVED FLAGS AND SAVE OLD POSITION
	TRNN	T1,XCT		;WAS AN EXECUTE IN PROGRESS?
	TRZ	F,XCT		;NO - CLEAR EXECUTE FLAG
	SKIPE	SAVEAC+1	;MOVE OFF THE SCREEN?
	SOJA	CM,DISALL	;YES - REWRITE THE SCREEN AND RETURN
	SOJA	CM,DISCUR	;NO - MAKE CURSOR POSITION RIGHT AND LOOP

;SUBROUTINE TO COUNT THE LENGTH OF THE SUBSTITUE STRING. USES SUBSLN
;IF IT'S POSITIVE; IF NEGATIVE, THERE ARE TABS IN THE STRING, SO THE
;COUNT MUST BE MADE FOR EACH SUBSTITUTE.
;UPDATES CM; USES T0, T3; PRESERVES T1, T2

SUBCTB:	SKIPG	T3,SUBSLN	;ANY TABS IN THE STRING?
	JRST	SUBCB0		;YES - GO COUNT THEM THE HARD WAY
	ADD	CM,T3		;NO - ADVANCE THE CURSOR OVER THE STRING
	POPJ	P,		;DONE

SUBCB0:	MOVE	T3,[POINT 7,SUBSTG] ;GET POINTER TO THE SUBSTITUTE STRING
SUBCB1:	ILDB	T0,T3		;GET A CHARACTER OF THE STRING
	JUMPE	T0,CPOPJ	;DONE IF NULL
	CAIN	T0,11		;TAB?
	TRO	CM,7		;YES - MOVE TO THE NEXT TAB STOP
	AOJA	CM,SUBCB1	;ELSE COUNT IT AND GET ANOTHER ONE

SUNERR:	SKIPA	T1,[[ASCIZ /######Can't do 0 iterations/]]
SUMERR::MOVEI	T1,[ASCIZ /#####Cursor movement is illegal/]
	JRST	ERROR

;**********************************************************************
;HERE TO JUSTIFY LINES OF TEXT BETWEEN /LM: AND /RM:.
;WITH A PARAGRAPH INDENT OF /PIND: AND A PREFIX STRING OF /JPRE:
;IF /FILL IS SET, ALIGNS THE RIGHT MARGIN; /NOFILL LEAVES IT RAGGED

JUSTIF::TRNE	F,RDO		;IS FILE READ-ONLY?
	JRST	RDOERR		;YES - COMMAND IS ILLEGAL
	SETZ	T1,		;END PARAMETER BUFFER WITH A NULL
	IDPB	T1,PARPTR
	MOVE	PT,[POINT 7,PARBUF]
	PUSHJ	P,SWHLUR	;READ PARAMETER CHARACTER
	CAIN	T1,"C"		;WANT TO CENTER THIS LINE?
	JRST	JUSCEN		;YES - GO DO IT

	MOVE	T4,JUSLNS	;GET LAST TIME'S NOMINAL
	TLNN	F,ENT		;IS THERE A PARAMETER TYPED?
	JRST	JUSNPM		;NO - USE THE ONE ALREADY SET UP
	MOVEM	T4,PARG1
	PUSHJ	P,PEEL.1	;READ NEW PARAMETER, IF ANY
	MOVE	T4,PARG1	;GET NUMBER OF LINES TO JUSTIFY
	MOVEM	T4,JUSLNS	;SAVE IT AS THE NEW NOMINAL
	JUMPE	T1,[SETOM SAVEAC+2 ;IF TOKEN, FLAG IT SO
		    MOVEI T4,1000  ;AND SET NUMBER OF LINES BIG
		    JRST  JUSTI1]  ;BACK TO THE FLOW
	SETZM	SAVEAC+2	;CLEAR TOKEN FLAG
JUSTI1:	PUSHJ	P,ERASPM	;RESET ENTER MODE
	TLNE	TM,XCI		;INITIALIZING FOR AN EXECUTE?
	JRST	LOOP		;YES - DONE NOW
	MOVEI	T1,1
	TRNE	F,RST		;WANT TO RESTORE THE NOMINAL PARAMETER?
	MOVEM	T1,JUSLNS	;YES - SET IT BACK TO ONE

JUSNPM::JUMPE	T4,DISCUR	;NOTHING TO DO IF ZERO LINES
	MOVEM	T4,SAVEAC+1	;ELSE SAVE FRAGGABLE COUNT
	MOVEM	T4,SAVEAC+6	;SAVE ALSO FOR DISPLAYING AT END
	SOS	ISVCNT		;DECREMENT INCREMENTAL SAVE COUNTER
	SETZ	CM,		;MOVE THE CURSOR TO THE START OF THE LINE
	TLO	F,XPC		;FORCE POINTER TO BE RE-MADE
	PUSHJ	P,MAKCPT	;GET A GOOD CHARACTER POINTER
	MOVE	PT,CHRPTR	;POINT TO THE START OF THE TEXT
	TLZ	F,FLG		;CLEAR AND PARAGRAPH FLAG
	TLO	F,PCM!CHG	;SET SPACER FLAG SO LEADING SPACERS ARE SKIPPED
	MOVEI	T3," "		;GET A SPACE

;PASS 1: LOOK THROUGH THE ENTIRE RANGE. CHANGE CRLF'S TO A SPACE; CHANGE
;MULTIPLE TABS, SPACES, AND CRLF'S TO A SINGLE SPACE. IF END OF A PARAGRAPH
;(TWO CRLF'S OR CRLF-SPACERS), IS FOUND, LEAVE ONE CRLF TO MARK IT.

;FLG == CRLF FOUND; SPACERS OR CRLF IS START OF A NEW PARAGRAPH
;PCM == SPACE FOUND; NULL ANY OTHERS

;SET UP POINTER TO END OF RANGE. CHECK FOR END OF FILE HERE;
;IGNORE IT IN PASS 2
;TOKEN JUSTIFY: SET FLAG; END PASS 1 ON FIRST END OF PARAGRAPH

;SAVEAC+0: POINTER TO PLACE TO PUT A CRLF BACK IN
;      +1: FRAGGABLE JUSLNS
;      +2: -1 == TOKEN PARAMETER, ELSE ZERO
;      ...
;      +6: JUSLNS AGAIN (USED BY JUSDPY)

	PUSHJ	P,JUSSTR	;STRIP THE LEADING STRING OFF THE FIRST LINE
JUSTP1:	SETZB	T4,T0		;GET A NULL FOR NULLING; CLEAR SPACE POINTER
JUSP1A:	ILDB	T1,PT		;GET A CHARACTER
	CAIG	T1," "		;SPECIAL CHARACTER?
	JRST	JUS1A3		;MAYBE - CHECK FURTHER
JUS1A2:	TLZ	F,FLG!PCM	;OTHER CHARACTER - CLEAR CRLF AND SPACER FLAGS
	JRST	JUSTP1		;COUNT IT AND DO SOME MORE

JUS1A3:	CAMN	PT,EN		;REACHED THE END OF THE FILE?
	JRST	JUSP2T		;YES - END OF PASS 1
	JUMPE	T1,JUSP1A	;IGNORE NULLS
	CAIE	T1," "		;SPACE,
	CAIN	T1,11		;  OR TAB?
	JRST	JUS1SP		;YES - DO SPACER STUFF
	CAIE	T1,15		;CARRIAGE RETURN?
	JRST	JUS1A2		;NO - SKIP THE NORMAL CHARACTER
				;YES - FALL TO CHECK FOR LINEFEED

;HERE WHEN A CARRIAGE RETURN IS FOUND. IF NOT FOLLOWED BY A LINEFEED, IT'S
;JUST ANOTHER CHARACTER. OTHERWISE COUNT ANOTHER LINE OF THE RANGE (DONE IF
;COUNTED OUT). SET CRLF AND SPACER FLAGS (FLG, PCM); CHANGE THE CRLF TO
;SPACE, NULL; SAVE POINTER TO THE FORMER CRLF IN CASE OF END OF PARAGRAPH

	MOVE	T2,PT		;GET POINTER TO THE CR
	ILDB	T1,PT		;GET THE NEXT CHARACTER
	JUMPE	T1,.-1		;IGNORE NULLS
	CAIE	T1,12		;IS IT A CRLF?
	JRST	JUS1A2		;NO - TREAT LONE CR LIKE A NORMAL CHARACTER
	TLOE	F,FLG		;YES - SET CRLF FLAG - ALREADY SET?
	JRST	JUS1C4		;YES - IT'S END OF PARAGRAPH - LEAVE THE CRLF
	MOVEM	T2,SAVEAC	;NO - SAVE THE POINTER TO THE FORMER CRLF
	TLNE	F,PCM		;IS THE SPACER FLAG SET?
	JRST	JUS1C1		;YES - SKIP THIS
	DPB	T3,T2		;NO - COVER THE CR WITH A SPACE
	MOVE	T0,T2		;SAVE THE POINTER TO THE SPACE
	JRST	JUS1C2		;SKIP THE OTHER DPB AND CONTINUE

JUS1C1:	DPB	T4,T2		;YES - COVER THE CR WITH A NULL
JUS1C2:	DPB	T4,PT		;AND COVER THE LF WITH A NULL
JUS1C3:	TLO	F,PCM		;SET THE SPACER FLAG
	SOSG	SAVEAC+1	;DECREMENT COUNT OF LINES - DONE?
	JRST	JUSTP2		;YES - IT'S TIME FOR PASS 2
	PUSHJ	P,JUSSTR	;NO - STRIP THE HEADER STRING FROM NEXT LINE
	JRST	JUSP1A		;AND CONTINUE WITH PASS 1

;HERE ON THE END OF A PARAGRAPH. IF A TOKEN PARAMETER WAS GIVEN, END PASS 1.

JUS1C4:	JUMPE	T0,JUS1C5	;IS THERE A SPACE TO NULL OUT?
	DPB	T4,T0		;YES - DO SO
	SETZ	T0,		;CLEAR POINTER TO SPACE
JUS1C5:	SKIPE	SAVEAC+2	;END OF PARAGRAPH - WAS IT A TOKEN PARM?
	JRST	JUSP2T		;YES - DONE WITH PASS 1
	SKIPN	SAVEAC		;NO - GOT END OF PARAGRAPH ALREADY?
	JRST	JUS1C1		;YES - NULL OVER THE WHOLE CRLF
	SETZM	SAVEAC		;NO - NOTE THAT EOP'S CRLF IS ALREADY THERE
	JRST	JUS1C3		;AND CONTINUE

;SUBROUTINE CALLED AT THE START OF EACH LINE
;REMOVES THE HEADER STRING, IF IT'S PRESENT, FROM THE LINE.
;IF IT'S NOT PRESENT, NO SWEAT.

JUSSTR:	HRRZ	T4,JSHCNT	;WANT TO REMOVE ANYTHING?
	JUMPE	T4,CPOPJ	;NO - NOTHING TO DO
	PUSH	P,T2		;SAVE A WORK AC
	PUSH	P,PT		;AND THE POINTER TO THE START OF THE LINE
	MOVE	T3,[POINT 7,JUSHED] ;POINT TO THE START OF THE STRING
JUSTR1:	ILDB	T1,PT		;GET THE NEXT CHARACTER
	JUMPE	T1,.-1		;SKIP IT IF NULL
	ILDB	T2,T3		;AND THE NEXT CHARACTER OF THE STRING
	CAME	T2,T1		;STILL MATCHING?
	JRST	JUSTRX		;NO - DON'T STRIP
	SOJG	T4,JUSTR1	;YES - LOOP THROUGH THE ENTIRE STRING
	POP	P,PT		;IT ALL MATCHES - POINT BACK TO START
	HRRZ	T3,JSHCNT	;GET THE LENGTH OF THE STRING
JUSTR2:	ILDB	T1,PT		;NULL OUT THE STRING - GET NEXT CHARACTER
	JUMPE	T1,.-1		;SKIP IT IF NULL
	DPB	T4,PT		;ELSE NULL IT OUT,
	SOJG	T3,JUSTR2	;COUNT IT AND LOOP

JUSTR3:	MOVEI	T3," "		;RESTORE THE SAVED AC
	POP	P,T2		;RESTORE THE WORK AC
	POPJ	P,		;DONE

JUSTRX:	POP	P,PT		;RESTORE ALL THE INTERESTING ACS
	SETZ	T4,		;PUT A NULL BACK IN T4
	JRST	JUSTR3		;DONE

;HERE IF A SPACE IS FOUND IN PASS 1. SET THE SPACER FLAG (PCM). IF IT WAS
;SET NULL OUT THE SPACE. IF THE CRLF FLAG (FLG) IS ON IT'S THE END OF A
;PARAGRAPH. CHANGE A TAB TO A SPACE.

JUS1SP:	TLOE	F,PCM		;MARK THE SPACER - ALREADY GOT ONE?
	JRST	JUS1S1		;YES - NULL THIS ONE OUT
	CAIN	T1,11		;NO - IS THE CHARACTER A TAB?
	DPB	T3,PT		;YES - CHANGE IT TO A SPACE
	MOVE	T0,PT		;SAVE THE POINTER TO THE SPACE
	JRST	JUSP1A		;AND CONTINUE WITH PASS 1

JUS1S1:	DPB	T4,PT		;NULL OUT THIS SPACER
	TLNE	F,FLG		;IS THIS THE END OF A PARAGRAPH?
	SKIPN	T2,SAVEAC	;YES - GET PTR TO FORMER CRLF - ALREADY DONE?
	JRST	JUSP1A		;NO OR DONE - GO CONTINUE WITH PASS 1
	JUMPE	T0,JUS1S2	;IS THERE A SPACE TO NULL?
	DPB	T4,T0		;YES - DO SO
JUS1S2:	MOVEI	T1,15		;PUT A CRLF BACK IN TO MARK END OF PARAGRAPH
	DPB	T1,T2
	MOVEI	T1,12
	IDPB	T1,T2
	SETZM	SAVEAC		;NOTE THAT THIS PARAGRAPH HAS BEEN MARKED
	JRST	JUSTP1		;CONTINUE WITH PASS 1

;HERE FOR PASS 2. PT/ END OF THE REGION, DO/ # CHARS IN RANGE.
;NOW THERE IS ONLY ONE SPACE BETWEEN EACH WORD AND A CRLF MARKS THE
;END OF A PARAGRAPH
;CARVE OFF FULL WORDS UNTIL LINE COUNT IS SATISFIED, THEN INDENT, JUSTIFY,
;AND ADD A CRLF AT THE END (BUT DON'T JUSTIFY IF IT'S THE END OF THE
;PARAGRAPH).

;SAVEAC+0: POINTER TO START OF CURRENT LINE
;      +1: POINTER TO THE PLACE TO SAVE THE LINE
;      +2: NUMBER OF WORDS IN THIS LINE
;      +3: POINTER TO END OF REGION
;      +4: INDENT FOR THIS LINE
;      +5: NUMBER OF LINES IN REGION AFTER JUSTIFY
;      +6: NUMBER OF LINES IN REGION BEFORE JUSTIFY (USED BY JUSDPY)
;      +7: NUMBER OF CHARACTERS UP TO THE LATEST WORD

JUSP2T:	MOVN	T1,SAVEAC+1	;HERE FROM A TOKEN PARAMETER:
	AOJ	T1,		;FIND NUMBER OF LINES IN REGION
	ADDB	T1,SAVEAC+6	;SAVE FOR THE DISPLAY ROUTINE
	TRNN	F,RST		;WANT TO RESTORE THE NOMINAL PARAMETER?
	MOVEM	T1,JUSLNS	;NO - SAVE LINE COUNT FOR NEXT TIME

JUSTP2:	TLZ	F,PCM		;CLEAN UP FROM PASS 1
	TLO	F,FLG		;TURN PARAGRAPH FLAG ON
	MOVEM	PT,SAVEAC+3	;SAVE POINTER TO END OF REGION
	HRRZM	PT,ADJWRD	;SAVE IT ALSO FOR ADJUSTING

	MOVE	T1,LMARGN	;FIND HOW MANY NULLS TO ADD:
	ADD	T1,PARIND	;GET THE LEFT MARGIN PLUS THE INDENT
	ADDI	T1,^D20		;  PLUS 20 SPACES PER LINE
	IMUL	T1,SAVEAC+6	;  TIMES THE NUMBER OF LINES IN THE RANGE
	MOVEM	T1,NUMCHR	;GIVES NUMBER OF NULLS NEEDED (AT MOST)
	PUSHJ	P,MAKNUL	;PUNCH A HOLE IN THE FILE
	SETZ	T1,		;CLEAR AND GET ADJUSTED END-OF-REGION ADDRESS
	EXCH	T1,ADJWRD
	HRRM	T1,SAVEAC+3	;SAVE IN THE E-O-R POINTER

	MOVE	T1,CHRPTR	;GET POINTER TO START OF NULLS
	MOVEM	T1,LINPTR	;IT'S THE START OF THE FIRST LINE, TOO
	MOVEM	T1,SAVEAC+1	;AND START OF THE JUSTIFIED TEXT
	MOVE	PT,T4		;GET POINTER TO START OF UNJUSTIFIED TEXT
	SETZB	T4,SAVEAC+5	;CLEAR COUNT OF ENDING LINES

JUSP2S:	MOVE	T3,RMARGN	;GET COUNT OF CHARACTERS THIS LINE
	MOVE	T2,LMARGN	;FIND THE INDENTATION
	TLNE	F,FLG		;DID A PARAGRAPH JUST START?
	ADD	T2,PARIND	;YES - ADD PARAGRAPH INDENT, TOO
	CAIGE	T2,0		;GOT A NEGATIVE TOTAL INDENT?
	SETZ	T2,		;YES - FORCE IT TO ZERO
	MOVEM	T2,SAVEAC+4	;SAVE THIS LINE'S INDENT
	SUB	T3,T2		;AND SUBTRACT IT FROM NUMBER OF CHARS WANTED
	HLRZ	T1,JSHCNT	;SUBTRACT THE LENGTH OF HEADER, TOO
	SUB	T3,T1
	SETZB	T0,SAVEAC+2	;CLEAR COUNTS OF CHARS AND WORDS THIS LINE
	MOVEM	PT,SAVEAC	;SAVE POINTER TO START OF THIS LINE
JUSP2A:	CAMN	PT,SAVEAC+3	;REACHED THE END OF THE REGION?
	JRST	JUS2ND		;YES - FINISH OFF AND DISPLAY
	ILDB	T1,PT		;NO - GET A CHARACTER
	CAIG	T1," "		;SPACE OR LESS?
	JRST	JUS2CK		;YES - CHECK FURTHER
JUSP2B:	TLZ	F,FLG		;SAY IT'S NO LONGER THE END OF A PARAGRAPH
	SOJGE	T3,JUSP2A	;COUNT THE CHARACTER - LOOP IF NOT END OF LINE

;HERE WHEN COUNTED OUT TO END OF LINE - DO THE JUSTIFICATION
;FLG == THE END OF THE PARAGRAPH
;PCM == THE END OF THE REGION

JUS2EL:	JUMPN	T0,JUS2E0	;WAS A SPACE FOUND IN THE LINE?
	MOVE	T0,PT		;NO - SET TO WRAP THE LINE AROUND
	TDZA	T3,T3		;REMEMBER THAT LINE WRAPPED
JUS2E0:	SETO	T3,		;NOTE THAT LINE DIDN'T WRAP
	MOVE	PT,SAVEAC	;GET POINTER TO THE START OF THE LINE
	MOVE	T2,SAVEAC+1	;AND POINTER TO THE PLACE TO STORE THE LINE
	PUSHJ	P,JUSINS	;INDENT THE LINE
	MOVEI	DO,-1		;GET DEFAULT NUMBER OF WORDS (BIG)
	SETZ	T1,		;GET DEFAULT SPACES PER WORD (ONE)
	SKIPE	FLLFLG		;USE DEFAULT IF NOT FILLING
	TLNE	F,FLG!PCM	;OR IF END OF PARAGRAPH OR REGION
	JRST	JUS2ES
	JUMPE	T3,JUS2ES	;OR IF LINE WRAPPED AROUND

	SKIPG	T1,SAVEAC+7	;GET THE NUMBER OF EXTRA SPACES TO ADD - ANY?
	JRST	JUS2ES		;NO - NOTHING TO ADJUST
	SOS	SAVEAC+2	;WORD COUNT WAS ONE TOO LARGE
	MOVE	DO,T2		;STORE POINTER FOR EXCHANGING BELOW
	IDIV	T1,SAVEAC+2	;OVER NUMBER OF WORDS, GIVES SPACES PER LINE
	EXCH	DO,T2		;GET # OF WORDS WHICH GET EXTRA SPACE
	JUMPE	DO,[MOVEI DO,-1	;IF GOT EXACTLY ENOUGH SPACES
		    JRST  JUS2ES] ;DO THE SAME THING FOR EVERY WORD
	TLCN	F,LFF		;FLIP ODD/EVEN LINE FLAG - EVEN?
	AOJA	T1,JUS2ES	;YES - ADD IN THE EXTRA SPACE AND CONTINUE
	MOVN	DO,DO
	ADD	DO,SAVEAC+2	;GET # OF WORDS WHICH GET NORMAL SPACING

JUS2ES:	MOVEM	T1,SAVEAC+2	;SAVE NUMBER OF SPACES - 1 BETWEEN WORDS

JUS2E1:	ILDB	T1,PT		;GET A CHARACTER
	CAMN	PT,T0		;AT THE END OF THE LINE?
	JRST	JUS2E2		;YES - FINISH THE LINE AND LOOP
	JUMPE	T1,JUS2E1	;NO - IGNORE IT IF NULL
	DPB	T4,PT		;ELSE NULL OUT THE SOURCE CHARACTER
	CAIN	T1," "		;END OF A WORD?
	PUSHJ	P,JUS3SP	;YES - ADD THE RIGHT AMOUNT OF SPACE
	IDPB	T1,T2		;NO - SAVE THE CHARACTER
	JRST	JUS2E1		;AND GET ANOTHER ONE

JUS2E2:	CAIE	T3,0		;DID THE LINE WRAP AROUND?
	DPB	T4,PT		;NO - NULL OUT THE SOURCE CHARACTER
	PUSHJ	P,JUSEOL	;END THE LINE WITH A CRLF
	TLNE	F,FLG		;IS THIS THE END OF A PARAGRAPH?
	PUSHJ	P,JUSEOL	;YES - THROW OUT ANOTHER CRLF
	MOVEM	T2,SAVEAC+1	;SAVE THE STORAGE POINTER
	JUMPE	T3,JUS2E4	;IF PREVIOUS LINE WRAPPED, DON'T LOSE LAST CHAR
	TLNN	F,PCM		;DONE WITH THE ENTIRE RANGE?
JUS2E3:	CAMN	PT,SAVEAC+3	;NO - SEE IF THE REGION ENDS HERE
	JRST	JUSDPY		;IT DOES - GO DISPLAY
	ILDB	T1,PT		;CHECK ALL THE NULLS AT THE END OF THE LINE
	JUMPE	T1,JUS2E3
JUS2E4:	ADD	PT,[70000,,0]	;BACK UP BEHIND THE REAL CHARACTER AGAIN
	JUMPGE	PT,JUSP2S
	SUB	PT,[430000,,1]
	JRST	JUSP2S		;THEN GO DO THE NEXT LINE

;HERE WHEN END OF REGION IS REACHED - SET FLAG TO SAY SO AND
;GO FINISH OFF THE LAST LINE. THEN DISPLAY; DONE

JUS2ND:	TLO	F,PCM		;NOTE THAT THIS IS THE LAST LINE
	TLNN	F,FLG		;JUST ENDED A PARAGRAPH?
	JRST	JUS2EL		;NO - FINISH THE LAST LINE; DONE
	JRST	JUSDPY		;YES - GO DISPLAY THE RESULT

;HERE WHEN A SPACE IS FOUND DURING PASS 2. BUMP COUNT OF WORDS
;AND SAVE POINTER TO THE SPACE

JUS2SP:	AOS	SAVEAC+2	;BUMP COUNT OF WORDS ON THIS LINE
	MOVE	T0,PT		;SAVE POINTER TO THE SPACE
	MOVEM	T3,SAVEAC+7	;SAVE CHARACTER COUNT UP TO THIS WORD
	JRST	JUSP2B		;COUNT THE CHARACTER AND LOOP

;HERE IF CHARACTER IS SPACE OR LESS - HANDLE SOME CHARACTERS SPECIALLY

JUS2CK:	JUMPE	T1,JUSP2A	;IGNORE NULLS
	CAIN	T1," "		;SPACE?
	JRST	JUS2SP		;YES - COUNT AND SAVE POINTER
	CAIE	T1,15		;CARRIAGE RETURN?
	JRST	JUSP2B		;NO - TREAT IT NORMALLY

	MOVE	T2,PT		;YES - CHECK FOR CRLF - GET A FRAGGABLE POINTER
	ILDB	T1,T2		;SEE IF A LF FOLLOWS THE CR
	CAIE	T1,12		;DOES IT?
	JRST	JUSP2B		;NO - TREAT THE CR LINE A NORMAL CHARACTER
	DPB	T4,T2		;YES - NULL OVER THE LINEFEED
	TLNE	F,FLG		;JUST HAD A CRLF?
	JRST	JU2CK1		;YES - JUST NULL THIS ONE OVER
	MOVE	T0,PT		;SET POINTER TO LATEST SPACE TO HERE
	TLO	F,FLG		;NOTE THAT IT'S THE END OF THE PARAGRAPH
	JRST	JUS2EL		;SO GO END IT, ALREADY

JU2CK1:	DPB	T4,PT		;NULL OUT THE CR
	MOVE	PT,T2		;SKIP OVER THE CRLF
	JRST	JUSP2A		;AND CONTINUE

;HERE WHEN A SPACE IS FOUND WHILE COPYING THE LINE
;PUT IN THE RIGHT NUMBER OF SPACES

JUS3SP:	SKIPN	T4,SAVEAC+2	;GET NUMBER OF EXTRA SPACES TO ADD - ANY?
	JRST	JUS3S1		;NO - DON'T PUT ANY IN
	IDPB	T1,T2		;SAVE A SPACE
	SOJG	T4,.-1		;LOOP TO SAVE ALL THE SPACES
JUS3S1:	SOJG	DO,CPOPJ	;DONE IF NO ADJUSTMENTS ARE NEEDED
	TLNE	F,LFF		;ELSE ON AN EVEN LINE?
	SOSA	SAVEAC+2	;NO - DE-BUMP NUMBER OF SPACES TO ADD
	AOS	SAVEAC+2	;YES - BUMP NUMBER OF SPACES TO ADD
	MOVEI	DO,-1		;SET WORD-COUNT BIG NOW
	POPJ	P,		;DONE

;HERE WHEN DONE - DELETE OLD TEXT FROM DISPLAY AND INSERT JUSTIFIED TEXT
;SAVEAC+6/ LINES IN OLD TEXT; SAVEAC+5/ LINES IN NEW TEXT

JUSDPY:	PUSHJ	P,POSCUR	;MAKE SURE THE CURSOR IS IN THE RIGHT PLACE
	MOVEI	DO,$JUSTI	;RESTORE THE COMMAND NAME
	TLO	F,XPB		;SAY BOTTOM POINTER IS BAD
	TLZ	F,FLG!PCM!LFF	;AND CLEAR THE FLAGS JUSTIFY USED
	MOVE	T4,LPP(TM)	;GET NUMBER OF LINES REMAINING ON SCREEN
	SUB	T4,RW
	CAMLE	T4,SAVEAC+5	;WILL THE RE-DISPLAY FIT IN THE SCREEN
	SKIPN	CLN(TM)		;YES - CAN THE TERMINAL CLEAR TO END OF LINE?
	JRST	DISDWN		;NEITHER - JUST DISPLAY TO END OF SCREEN
	CAMGE	T4,SAVEAC+6	;START WITH MORE LINES THAN WERE ON THE SCREEN?
	JRST	DISDWN		;YES - JUST DISPLAY TO END OF SCREEN
	MOVE	T4,SAVEAC+6	;FIND CHANGE IN LINES BEFORE AND AFTER
	SUB	T4,SAVEAC+5
	JUMPE	T4,JUSDP2	;IF NO CHANGE, DON'T INSERT OR DELETE ANY
	JUMPL	T4,JUSDP1	;JUMP IF LINES INCREASED
	SKIPN	DLN(TM)		;ELSE DELETE LINES - CAN THE TERMINAL DO IT?
	JRST	DISDWN		;NO - JUST DISPLAY FROM HERE DOWN
	EXCH	T4,T2		;YES - PUT NUMBER OF LINES IN THE RIGHT PLACE
	TLNE	F,FNC		;IS THE FENCE UP?
	PUSHJ	P,JUSFNE	;YES - REMOVE IT
JUSDP0:	MOVE	T1,DLN(TM)	;GET SEQUENCE TO DELETE LINES
	PUSHJ	P,PUTSEQ	;DELETE THE EXCESS LINES
	SOJG	T2,JUSDP0
	EXCH	T4,T2		;PUT T2 AND T4 IN THE RIGHT PLACES
	JRST	JUSDP2		;NOW GO CLEAR OUT AND REWRITE THE REGION

JUSDP1:	MOVN	T4,T4		;# LINES INCREASED - MAKE COUNT POSITIVE
JSDP1A:	SKIPN	T1,ILN(TM)	;INSERT LINES - CAN THE TERMINAL DO IT?
	JRST	DISDWN		;NO - JUST DISPLAY FROM HERE DOWN
	PUSHJ	P,PUTSEQ	;INSERT THE NEEDED LINES
	SOJG	T4,JSDP1A
	TLZE	F,FNC		;WAS THE FENCE ON THE SCREEN BEFORE?
	PUSHJ	P,FIXBLW	;YES - PUT IT BACK IF IT'S STILL THERE
	PUSHJ	P,POSCUR	;RE-POSITION THE CURSOR

JUSDP2:	MOVEI	T1,15		;MAKE SURE CURSOR IS AT START OF LINE
	IDPB	T1,TY
	MOVE	T4,SAVEAC+5	;GET COUNT OF LINES TO CLEAR
JUSDP3:	MOVE	T1,CLN(TM)	;GET THE LINE-CLEARING SEQUENCE
	PUSHJ	P,PUTSEQ	;CLEAR OUT A LINE
	PUSHJ	P,CDOWN		;MOVE DOWN A LINE
	SOJG	T4,JUSDP3	;LOOP THROUGH ALL THE LINES
	PUSHJ	P,POSCUR	;POSITION TO THE START OF THE REGION

	MOVE	T4,SAVEAC+5	;GET NUMBER OF LINES TO DISPLAY
	MOVE	PT,LINPTR	;AND POINTER TO START OF FIRST LINE
	PUSHJ	P,DISPLY	;DISPLAY THEM LINES

	MOVE	T4,SAVEAC+6	;FIND CHANGE IN LINES BEFORE AND AFTER
	SUB	T4,SAVEAC+5
	JUMPLE	T4,DISCUR	;DONE, UNLESS LINES WERE DELETED
	MOVEM	T4,ROLLS
	MOVN	T4,T4
	ADD	T4,LPP(TM)	;GET LINE NUMBER OF START OF REWRITE
	MOVEM	T4,SAVEAC
	PUSHJ	P,ROLFW1	;REPAIR THE BOTTOM OF THE SCREEN
	JRST	LOOP		;DONE

;SUBROUTINES TO ERASE THE FENCE AND TO PUT IT BACK IF IT'S THERE

JUSFNE:	PUSHJ	P,CBOTOM	;ERASE THE FENCE FROM THE BOTTOM LINE
	JRST	POSCUR		;RE-POSITION THE CURSOR AND RETURN

;SUBROUTINE TO INSERT A CRLF IN THE NEW TEXT AND COUNT ANOTHER LINE

JUSEOL:	MOVEI	T1,15		;END THE LINE WITH A CRLF
	IDPB	T1,T2
	MOVEI	T1,12
	IDPB	T1,T2
	AOS	SAVEAC+5	;BUMP COUNT OF ENDING LINES
	POPJ	P,		;DONE

;SUBROUTINE TO ADD THE HEADER STRING, IF ANY, TO THE START OF THE LINE.
;IT THEN ADDS TABS AND/OR SPACES TO START THE LINE AT THE LEFT MARGIN
;CALL WITH T2/ PTR TO TEXT; RETURNS T4/ 0. USES T1

JUSINS:	HRRZ	T4,JSHCNT	;GOT A HEADER STRING TO INSERT?
	JUMPE	T4,JUSIN0	;NO - SKIP THIS
	MOVE	DO,[POINT 7,JUSHED] ;YES - GET POINTER TO THE STRING
JUSINL:	ILDB	T1,DO		;GET A CHARACTER
	IDPB	T1,T2		;SAVE IT
	SOJG	T4,JUSINL	;LOOP THROUGH ALL CHARACTERS

JUSIN0:	SKIPG	T4,SAVEAC+4	;FIND THE NUMBER OF SPACES TO INSERT - ANY?
	POPJ	P,		;NO - DONE
	CAIL	T4,10		;GOT ROOM FOR A TAB?
	SKIPE	INSTBS		;YES - WANT TO INSERT TABS IF POSSIBLE?
	JRST	JUSIN2		;NO ROOM OR NO TAB - DO IT ALL IN SPACES
	MOVEI	T1,11		;ELSE ADD AS MANY TABS AS POSSIBLE
JUSIN1:	CAIGE	T4,10		;GOT ROOM FOR ANOTHER TAB?
	JRST	JUSIN2		;NO - FINISH OFF WITH SPACES
	IDPB	T1,T2		;YES - SAVE IT
	SUBI	T4,10		;COUNT THE TAB
	JRST	JUSIN1		;AND TRY FOR ONE MORE

JUSIN2:	JUMPE	T4,CPOPJ	;DONE IF COUNTED OUT
	MOVEI	T1," "		;ELSE GET A SPACE FOR SAVING
	IDPB	T1,T2		;SAVE SPACES
	SOJG	T4,.-1		;UNTIL COUNTED OUT
	POPJ	P,		;DONE

;HERE TO CENTER THE LINE THE CURSOR IS ON BETWEEN /LM: AND /RM:
;(THE CURSOR CAN BE ANYWHERE IN THE LINE; IT ENDS UP AT THE BEGINNING)

JUSCEN:	PUSHJ	P,ERASPM	;REPAIR THE SCREEN FROM THE PARAMETER
	PUSHJ	P,MAKLPT	;GET A GOOD LINE POINTER
	MOVE	PT,LINPTR	;GET THE POINTER TO THE START OF THE LINE
	MOVEM	PT,CHRPTR	;MOVE THE CURSOR TO THE START
	SETZB	T4,CM		;CLEAR THE COUNTER; MOVE TO COLUMN ZERO
	MOVEI	T3," "		;GET A SPACE TO COPY OVER TABS
	TLZA	F,XPC		;SAY THE CHARACTER POINTER IS O.K.

;NOW SEE HOW LONG THE LINE IS, WHILE NULLING OUT LEADING AND TRAILING
;SPACES AND TABS

JUSCN1:	DPB	T4,PT		;NULL OUT THE SPACER
	ILDB	T1,PT		;GET THE NEXT CHARACTER
	JUMPE	T1,.-1		;IGNORE NULLS
	CAIE	T1," "		;SPACE,
	CAIN	T1,11		;  OR TAB?
	JRST	JUSCN1		;YES - NULL IT OUT AND KEEP LOOKING
	JRST	JUSC2A		;NO - JUMP INTO THE COUNTING LOOP

JUSCN2:	ILDB	T1,PT		;SEE HOW LONG THE LINE IS - GET A CHARACTER
	JUMPE	T1,JUSCN2	;IGNORE NULLS
JUSC2A:	CAIN	T1,11		;TAB?
	DPB	T3,PT		;YES - CHANGE IT TO A SPACE
	CAIE	T1,15		;CARRIAGE RETURN?
	AOJA	T4,JUSCN2	;NO - COUNT THE CHARACTER AND LOOP
	PUSHJ	P,ISCRLF	;YES - IS IT A CRLF PAIR?
	  AOJA	T4,JUSCN2	;NO - COUNT THE CR AND CONTINUE LOOKING

	SETZ	T3,		;YES - STRIP TRAILING SPACES/TABS - GET A NULL
JUSCN3:	ADD	PT,[70000,,0]	;BACK UP A CHARACTER
	CAIGE	PT,0
	SUB	PT,[430000,,1]
	LDB	T1,PT		;GET THE PREVIOUS CHARACTER
	JUMPE	T1,JUSCN3	;SKIP IT IF NULL
	CAIE	T1," "		;SPACE?
	JRST	JUSCN4		;NO - PROCEED WITH CENTERING
	DPB	T3,PT		;YES - NULL IT OUT
	SOJA	T4,JUSCN3	;UN-COUNT IT AND CHECK THE NEXT ONE

JUSCN4:	SUB	T4,RMARGN	;YES - SEE HOW MUCH SPACE TO ADD
	ADD	T4,LMARGN
	ASH	T4,-1		;(NOW T4/ NEGATIVE SPACE TO ADD)
	JUMPGE	T4,JUSCN5	;IF LINE IS TOO LONG, JUST RE-DISPLAY IT

	MOVNM	T4,NUMCHR	;ELSE SAVE (POSITIVE) NUMBER OF SPACES TO ADD
	PUSHJ	P,MAKSPC	;PUT THEM IN
JUSCN5:	PUSHJ	P,DISONL	;RE-DISPLAY THE LINE
	JRST	DISCUR		;RE-POSITION THE CURSOR AND GET A NEW COMMAND

	END