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Trailing-Edge - PDP-10 Archives - steco_19840320_1er_E35 - 7,3/sed/sed1ex.mac
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TITLE	SED1EX - SED ROUTINES FOR THE EXECUTE COMMAND
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 TO OPEN OR CLOSE THE EXECUTE BUFFER OR SET UP TO ITERATE IT A FEW TIMES

EXECUT::TLZ	F,PCM		;CANCEL THE PICK-CLOSE MARK, IF ANY
	TRZE	F,CMV		;DID USER USE CURSOR MOVEMENT?
	JRST	[MOVE  T3,[POINT 7,PARBUF]
		 PUSHJ P,PELS.M	;YES - READ PARAMETER FROM THE FILE
		 JRST  EXECU1]	;CONTINUE
	SETZ	T1,		;END BUFFER WITH A NULL
	IDPB	T1,PARPTR
EXECU1:	HLRZ	T1,PARBUF	;GET FIRST CHARACTER OF PARAMETER
	LSH	T1,-^D11
	ANDI	T1,137		;IF IT'S LOWER CASE, MAKE IT UPPER
	CAIN	T1,"S"		;SET UP A BUFFER?
	JRST	XCTSET		;YES - DO IT
	CAIN	T1,"K"		;KILL A BUFFER?
	JRST	XCTKIL		;YES - DO IT
	CAIN	T1,"W"		;WRITE INTO A BUFFER?
	JRST	XCTWRT		;YES - DO IT
	CAIN	T1,"R"		;READ AND LIST A BUFFER IN SWITCH FORMAT?
	JRST	XCTRDL		;YES - DO IT
	CAIN	T1,"L"		;READ AND LIST A BUFFER IN WRITE FORMAT?
	JRST	XCTRDW		;YES - DO IT
	CAIN	T1,"N"		;LIST THE DEFINED BUFFER NAMES?
	JRST	XCTNML		;YES - DO IT
	CAIN	T1,"X"		;WRITE AND EXECUTE BUFFER?
	JRST	XCTXCT		;YES - DO IT
	CAIN	T1,"B"		;LINK BUFFER TO A KEYBOARD BUTTON?
	JRST	XCTBTN		;YES - DO IT
	CAIN	T1,"@"		;READ A FILE OF BUFFER SWITCHES?
	JRST	XCTBSW		;YES - DO IT

;HERE TO SET UP A NUMBER OF ITERATIONS

EXCUT0:	PUSHJ	P,PEEL.1	;READ PARAMETER, IF ANY
	JUMPE	T1,EXCOPN	;IF NO PARM, JUST OPEN EXECUTE BUFFER
	MOVE	T4,PARG1	;ELSE GET NUMBER OF ITERATIONS
	MOVE	T3,T4		;HERE, TOO
	EXCH	T4,XCTITR	;SAVE AS NEW NOMINAL
EXCUT1:	EXCH	T3,XCTNUM	;AND AS CURRENT NUMBER
	SKIPGE	T1,XCTACW	;GET BUFFER POINTER - IS THERE ONE?
	JRST	XCOERR		;NO - NO-ACTIVE-BUFFER ERROR
	MOVE	T1,XCTADR(T1)
	ILDB	T1,T1		;MAKE SURE THERE'S SOMETHING THERE
	JUMPE	T1,XCXERR	;IF NOTHING THERE, ERROR
	SKIPE	XSHFLG		;WANT TO DISPLAY THE EXECUTE?
	PUSHJ	P,ERASPM	;YES - ERASE PARAMETER
	TLNE	TM,JRC		;DOING A JOURNAL RESTORE?
	JRST	EXCU1A		;YES - THEN IT'S A TOP-LEVEL EXECUTE
	TRNE	F,XCT!XBN	;ALREADY EXECUTING?
	JRST	EXCSVX		;YES - SAVE CONTEXT (RETURN TO EXCU1C)
EXCU1A:	MOVE	T1,[PARAMS,,SAVPRM]
	BLT	T1,SAVPRM+SAVPML-1 ;SAVE ALL PARAMETERS
	HRRM	F,SAVFGS	;ALSO SAVE RH OF F
	HLLM	TM,SAVFGS	;  AND LH OF TM
	TRZ	F,XCT!XBN	;CLEAR JOURNAL-RESTORE FLAGS
	TLZ	TM,JRC
EXCU1B:	SKIPE	XSHFLG		;WANT TO DISPLAY THE EXECUTE?
	TROA	F,XBN		;YES - SET THE RIGHT FLAG
	TRO	F,XCT		;NO  - SET THE RIGHT FLAG
EXCU1C:	MOVE	T1,XCTACW	;GET BUFFER POINTER
	MOVE	T1,XCTADR(T1)
	MOVEM	T1,XCTACR	;SET BUFFER UP FOR READING
	MOVEM	T1,XCTPTR
	TRZE	F,XSV		;SAVING COMMANDS?
	PUSHJ	P,XCTWIP	;YES - WIPE OUT THE "ENTER NUMBER EXECUTE"
	JRST	XCTEND		;FINISH OFF

;SUBROUTINE TO WIPE OUT THE EXECUTE COMMAND "ENTER SOMETHING EXECUTE"
;FROM THE BUFFER

XCTWIP:	MOVE	PT,XCTPTW	;GET POINTER TO END OF BUFFER
XCTWP1:	ADD	PT,[70000,,0]	;BACK IT UP A NOTCH
	CAIGE	PT,0		;(USER TYPED "ENTER MUMBLE EXECUTE":
	SUB	PT,[430000,,1]	;  WANT TO REMOVE THAT FROM BUFFER)
	LDB	T1,PT		;GET CHARACTER
	CAIE	T1,33		;ENTER?
	JRST	XCTWP1		;NO - KEEP SKIPPING
XCTCLO:	SETZ	T1,		;YES - SAVE A NULL OVER THE ENTER
	DPB	T1,PT
	MOVEI	T1,1		;AND SET END-OF-BUFFER FLAG
	ORM	T1,(PT)
	HRRM	PT,XCFPTR	;SAVE NEW START-OF-FREE-SPACE POINTER
	POPJ	P,		;DONE

;HERE TO SAVE CURRENT BUFFER STATUS SO ANOTHER CAN BE EXECUTED

EXCSVX:	SKIPE	XCTPSV		;ALREADY DOWN A LEVEL?
	JRST	XSXERR		;YES - ONLY ONE STACK ALLOWED
	MOVE	T1,XCTPTR	;NO - SAVE ACTIVE BUFFER POINTER
	MOVEM	T1,XCTPSV
	MOVE	T1,XCTACR	;AND ACTIVE BUFFER STARTING POINTER
	MOVEM	T1,XCTASV
	MOVEM	T3,XCTNSV	;SAVE ACTIVE NUMBER OF ITERATIONS
	MOVEM	T4,XCTISV	;SAVE NOMINAL NUMBER OF ITERATIONS
	JRST	EXCU1C		;FINISH THE THE SET-UP

;HERE FOR JUST ENTER EXECUTE: OPEN BUFFER AND START SAVING COMMANDS

EXCOPN:	TRO	F,XSV		;SET FLAG TO SAVE COMMANDS
	SETZM	XCTITR		;CLEAR NUMBER OF ITERATIONS
	SETZM	XCTNUM
EXCOP1:	SKIPGE	T1,XCTACW	;IS THERE AN ACTIVE BUFFER?
	JRST	XCOERR		;NO - ERROR
	MOVE	T2,XCFPTR	;YES - GET POINTER TO START OF FREE SPACE
	MOVEM	T2,XCTPTW	;SAVE AS WRITE POINTER TO BUFFER DATA
	MOVEM	T2,XCTADR(T1)	;  AND AS STORED POINTER TO BUFFER DATA
XCTEND:	PUSHJ	P,ERASPM
	JRST	DISCUR		;RE-POSITION CURSOR AND LOOP

;HERE TO SET UP AN EXECUTE BUFFER - IF GIVEN NAME IS NOT FOUND,
;CREATE BUFFER WITH THAT NAME

XCTSET::TRZE	F,XSV		;WAS A BUFFER OPEN?
	PUSHJ	P,XCTWIP	;YES - CLOSE IT
	PUSHJ	P,XCTRED	;READ BUFFER NAME AND FIND IT
	JUMPGE	T1,XCTST1	;JUMP IF FOUND
	MOVEI	T1,XBFNUM-1	;ELSE CREATE IT - FIND OPEN SLOT
	SKIPE	XCTNAM(T1)
	SOJGE	T1,.-1		;NOT OPEN - TRY AGAIN
	JUMPL	T1,XCSERR	;JUMP IF NONE OPEN - ERROR
	MOVEM	T4,XCTNAM(T1)	;SAVE NAME IN THIS SLOT
XCTST1:	MOVEM	T1,XCTACW	;SAVE INDEX OF ACTIVE BUFFER
	TLZN	F,FLG		;WANT TO RETURN TO A CALLER?
	JRST	XCTEND		;NO
	POPJ	P,		;YES

;SUBROUTINE TO ASK FOR AND FIND AN EXECUTE BUFFER. IF FOUND, THAT
;BUFFER IS MADE ACTIVE AND THE INDEX IS RETURNED IN T1.
;IF NOT FOUND THIS ROUTINE RETURNS -1 IN T1.

XCTFND:	TRZE	F,XSV		;WAS A BUFFER OPEN?
	PUSHJ	P,XCTWIP	;YES - CLOSE IT
	PUSHJ	P,XCTRED	;READ BUFFER NAME AND FIND IT
	JUMPL	T1,XCNERR	;ERROR - NAME NOT FOUND
	MOVEM	T1,XCTACW	;ELSE SAVE INDEX OF ACTIVE BUFFER
	POPJ	P,		;AND RETURN SUCCESS

;HERE TO KILL OFF A GIVEN EXECUTE BUFFER

XCTKIL:	TRZE	F,XSV		;WAS A BUFFER OPEN?
	PUSHJ	P,XCTWIP	;YES - CLOSE IT
	PUSHJ	P,XCTRED	;READ AND FIND NAME OF BUFFER
	JUMPL	T1,XCKERR	;NOT FOUND - ERROR
	MOVE	PT,T1
	PUSHJ	P,XCTKLL	;ELSE ZERO OUT ITS INFORMATION
	CAMN	T2,XCTACW	;IS THIS THE ACTIVE ONE?
	SETOM	XCTACW		;YES - SAY THERE IS NO ACTIVE BUFFER
	JRST	XCTEND		;DONE

XCTKLL:	SETZM	XCTNAM(PT)	;ZERO OUT BUFFER NAME
	PUSHJ	P,XCTKLF	;DELETE THE BUFFER CONTENTS FROM FREE SPACE
XCTKLK:	SKIPN	XCTKEY(PT)	;IS THERE A KEY?
	POPJ	P,		;NO - DONE
	MOVE	T2,[POINT 7,XCTKEY(PT)]
	SETOM	SAVEAC+6	;RESTORE COMMAND IN TABLE
	PUSHJ	P,SUBTBX
	SETZM	XCTKEY(PT)	;CLEAN OUT OLD KEY
	POPJ	P,

;SUBROUTINE TO KILL THE CONTENTS OF AN EXECUTE BUFFER FROM FREE SPACE
;ENTER WITH PT/ BUFFER INDEX

XCTKLF:	SKIPN	T4,XCTADR(PT)	;GET EXECUTE BUFFER POINTER - ANY?
	POPJ	P,		;NO - NOTHING TO KILL
	AOJ	T4,		;YES - POINT TO FIRST WORD OF DATA
XCTKF1:	MOVE	T1,(T4)		;GET A BUFFER DATA WORD
	TRNN	T1,1		;IS IT THE LAST WORD?
	AOJA	T4,XCTKF1	;NO - LOOP UNTIL FOUND
	SETZB	T1,(T4)		;YES - TURN OFF THE END-OF-DATA FLAG
	EXCH	T1,XCTADR(PT)	;CLEAR AND GET POINTER TO START OF DATA
	CAMN	T4,XCFPTR	;DOES THIS DATA AREA BUTT AGAINST FREE SPACE?
	MOVEM	T1,XCFPTR	;YES - SAVE AS NEW START OF FREE SPACE
	POPJ	P,		;DONE

;HERE TO SAVE A STRING INTO THE ACTIVE BUFFER

XCTWRT:	TRZE	F,XSV		;WAS A BUFFER OPEN?
	PUSHJ	P,XCTWIP	;YES - CLOSE IT
	MOVE	PT,[POINT 7,PARBUF,6]
XCWRT0::MOVEM	PT,SAVEAC	;SAVE THE POINTER TO THE NEW CONTENTS
	SKIPGE	PT,XCTACW	;GET POINTER TO OLD BUFFER CONTENTS - ANY?
	JRST	XCOERR		;NONE ACTIVE - ERROR
	PUSHJ	P,XCTKLF	;DELETE PREVIOUS CONTENTS FROM FREE SPACE
	MOVE	T4,XCFPTR	;GET POINTER TO START OF FREE SPACE
	MOVEM	T4,XCTADR(PT)	;SAVE AS TARGET POINTER
	MOVE	PT,SAVEAC	;GET POINTER TO NEW CONTENTS BACK
	SETZ	T0,		;CLEAR PARENTHETICAL COUNTER

XCWRT1:	ILDB	T1,PT		;GET A CHARACTER
XCWR1A:	JUMPE	T1,XCWEND	;DONE IF NULL
	CAIGE	T1," "		;SOME CONTROL CHARACTER?
	JRST	XCWRT1		;YES - IGNORE IT
	CAIN	T1,"^"		;SOME COMMAND?
	JRST	XCWCMD		;YES - PURSUE IT
	CAIN	T1,"$"		;ENTER (OR ESCAPE)?
	MOVEI	T1,33		;YES - SET IT UP
	CAIN	T1,")"		;MAYBE THE END OF A CONDITIONAL?
	JUMPG	T0,XCWRPE	;IF SO, END THE BLOCK
XCWRT2:	PUSHJ	P,XCTWO1	;SAVE CHARACTER
	JRST	XCWRT1		;AND GET ANOTHER

XCWCMD:	ILDB	T1,PT		;GET 1ST LETTER OF COMMAND NAME
	CAIE	T1,"$"		;REALLY WANT A REAL DOLLAR SIGN,
	CAIN	T1,")"		;  OR CLOSE PAREN?
	JRST	XCWRT2		;YES - JUST SAVE IT
	CAIN	T1,"/"		;HOW ABOUT A REAL SLASH?
	JRST	XCWRT2		;YES - JUST SAVE IT
	CAIN	T1,"^"		;REALLY WANT AN UP-ARROW?
	JRST	[PUSHJ P,XCTWO1	;YES - JUST GO SAVE IT TWICE
		 JRST  XCWRT2]
	CAIG	T1,"9"		;NO - GOT A REPEAT COUNT?
	JRST	XCWRPT		;YES - SET COUNT UP
	MOVEI	T2,"^"		;NO - GET AN UP-ARROW
	PUSHJ	P,XCWGT1	;PUT NEW CHARACTER IN WITH IT
	PUSHJ	P,XCWGET	;GET REST OF COMMAND NAME
	CAME	T2,["^RF"]	;GOT A ROLL FORWARD
	CAMN	T2,["^RB"]	;  OR BACKWARD?
	JRST	XCWRT3		;YES - NEED TO GET ANOTHER CHARACTER
	LSH	T2,^D15		;NO - LEFT-JUSTIFY COMMAND NAME
XCWRT4:	MOVEI	T1,CMDLEN-1	;LOOK FOR COMMAND AMONG NAMES
	CAME	T2,CMDNAM(T1)	;IS THIS IT?
	SOJGE	T1,.-1		;NO - KEEP LOOKING
	JUMPLE	T1,XCWCON	;IF NOT FOUND, SEE IF IT'S A CONDITIONAL
	CAIGE	T1," "		;GOT A HIGH-NUMBERED COMMAND?
	JRST	XCWRT2		;NO - O.K.
XCWRT5:	MOVEI	T2,"^"		;YES - PRECEDE IT WITH AN UP-ARROW
	PUSHJ	P,XCTWO2
	JRST	XCWRT2		;THEN SAVE COMMAND

XCWRT3:	PUSHJ	P,XCWGET	;GET REST OF COMMAND NAME
	LSH	T2,^D8		;LEFT-JUSTIFY COMMAND NAME
	JRST	XCWRT4		;GO FIND THE COMMAND

XCWGET::ILDB	T1,PT		;GET NEXT CHARACTER
XCWGT1:	CAIL	T1,"a"		;LOWER CASE?
	SUBI	T1,40		;YES - CONVERT TO UPPER
	LSH	T2,7		;SHIFT OVER ALREADY-GOTS
	OR	T2,T1		;PUT NEW CHARACTER IN WITH THEM
	POPJ	P,		;DONE

;CONDITIONAL FLAGS: COND; DO, FR, FC, IF, DW, NOT
;IF DO FLAG, THEN REST OF BYTE (5 BITS) IS HIGH ORDER OF COUNT
;IF FC, FR, OR F. THEN THREE LOW FLAGS ARE: EQU, GRTR, NOT
;ALSO, 100 IS END OF A DO BLOCK AND 101 IS END OF AN IF

XCWCON:	JUMPE	T1,[MOVEI T1,77	;IF RESET, SAVE "^",77
		    JRST  XCWRT5]
	MOVEI	T1,CMDCLN-1	;LOOK FOR CONSTRUCT AMONG THE NON-COMMANDS
XCWCN0:	MOVE	T3,CMDCON(T1)	;GET A NON-COMMAND
	TRZ	T3,77777	;KEEP ONLY 1ST 3 CHARACTERS
	CAME	T2,T3		;IS THIS IT?
	SOJGE	T1,XCWCN0	;NO - KEEP LOOKING
	JUMPL	T1,XCWERR	;ERROR IF NOT FOUND
	LDB	T2,[POINT 7,CMDCON(T1),35] ;ELSE GET TYPE FLAGS
	TRNN	T2,100		;GOT A CONDITIONAL?
	JRST	XCWCNX		;NO - CHECK FURTHER
	CAIN	T2,102		;GOT A DO WHILE?
	SKIPA	T1,[100]	;YES - STACK DO'S END CHARACTER
	MOVEI	T1,101		;ELSE STACK IF'S
	PUSH	P,T1		;STACK IT, ALREADY
	MOVEI	T1,"^"		;START CONDITIONAL BLOCK
	PUSHJ	P,XCTWO1
	TRNE	T2,30		;GOT IF-ROW, -COLUMN, OR -COUNTER?
	JRST	XCWCNF		;YES - GO READ CONDITION AND NUMBER
XCWCN1:	ILDB	T1,PT		;GET NEXT CHARACTER
	CAIE	T1,"^"		;"NOT" OR CHARACTER CLASS?
	JRST	XCWCN2		;NO - FINISH OFF

;VALUES ARE: SPACE (5), NUMBER (3), ALPHA (LETTER) (1), UPPER CASE (6),
;ALPHA-NUMERIC (4), END OF LINE (2), CHARACTER == NOT SPACE
;ALSO, BLOCK OF CHARACTERS OR CONDITIONS TO BE OR'D STARTS WITH ^< (20)
; AND ENDS WITH > (21).

	ILDB	T1,PT		;GET NEXT CHARACTER
	CAIN	T1,"("		;GOT A REAL OPEN PAREN?
	JRST	XCWCN2		;YES - TREAT IT LIKE THE CHARACTER IT IS
REPEAT 0,<
	CAIN	T1,74		;GOT THE START OF A CONDITIONAL BLOCK?
	JRST	XCWCBS		;YES - SET TO CALL THIS STUFF MANY TIMES
	CAIN	T1,76		;GOT THE END OF A CONDITIONAL BLOCK?
	JRST	XCWCBE		;YES - NOTE THAT THE BLOCK IS OVER
>
	ANDI	T1,137		;CONVERT LOWER CASE TO UPPER
	CAIGE	T1,"A"		;GOT SOME REAL LETTER?
	JRST	XCWERR		;NO - IT'S AN ERROR FROM THE START
	CAIN	T1,"X"		;GOT A "NOT" FLAG?
	JRST	[TRO  T2,1	;YES - SET THE FLAG
		 JRST XCWCN1]	;GO GET THE CHARACTER OR CLASS
	CAIN	T1,"L"		;CHECK CLASS: LETTER?
	MOVEI	T1,1		;YES - GET VALUE
	CAIN	T1,"N"		;NUMERIC?
	MOVEI	T1,3		;YES - GET VALUE
	CAIN	T1,"E"		;END OF LINE?
	MOVEI	T1,2		;YES - GET VALUE
	CAIN	T1,"A"		;ALPHA-NUMERIC?
	MOVEI	T1,4		;YES - GET VALUE
	CAIN	T1,"U"		;UPPER CASE?
	MOVEI	T1,6		;YES - GET VALUE
	CAIN	T1,"C"		;ANY CHARACTER?
	TROA	T2,1		;YES - SET "NOT" AND SPACE VALUE
	CAIN	T1,"S"		;SPACE CHARACTER?
	MOVEI	T1,5		;YES - SET VALUE
	CAILE	T1,6		;GOT A LEGAL VALUE?
	JRST	XCWERR		;NO - MISTAKE

	PUSHJ	P,XCTWO2	;SAVE FLAGS
	MOVEI	T2,"^"		;SAVE CLASS FLAG
XCWCN2:	PUSHJ	P,XCTWO2
	PUSHJ	P,XCTWO1	;SAVE CLASS TO LOOK FOR
	ILDB	T1,PT		;GET CHARACTER AFTER CONDITIONAL
	JRST	XCWRPX		;SKIP "(", IF ANY, AND LOOP

XCWCNX:	MOVEI	T1,"^"		;SAVE AN UP-ARROW
	PUSHJ	P,XCTWO1
	PUSHJ	P,XCTWO2	;THEN SAVE COMMAND
	CAIN	T2,16		;IS IT OUTPUT?
	JRST	XCWCXO		;YES - READ AND SET UP THE STRING
	CAIE	T2,15		;IS IT INITIALIZE?
	CAIN	T2,21		;  OR DO-ON-SEARCH-FAILURE?
	JRST	XCWCX1		;YES - GO STACK
	CAIE	T2,10		;IS IT ITERATE-COUNTER?
	JRST	XCWRT1		;NO - LOOP
XCWCX1:	PUSH	P,[100]		;YES - STACK THE END-REPEAT CHARACTER
	ILDB	T1,PT		;GET NEXT CHARACTER
	JRST	XCWRPX		;SKIP "(", IF ANY, AND LOOP

;HERE FOR THE OUTPUT CONSTRUCT - SAVE CHARACTERS UNTIL A ")"

XCWCXO:	ILDB	T1,PT		;GET THE "(" AFTER THE "^OU"
	CAIE	T1,"("		;IS IT REALLY AN OPEN PAREN?
	JRST	XCWERR		;NO - ERROR
XCWXO1:	ILDB	T1,PT		;GET A CHARACTER TO OUTPUT
	JUMPE	T1,XCWERR	;ERROR IF END OF BUFFER REACHED
	CAIN	T1,")"		;END OF STRING?
	JRST	XCWXOE		;YES - FINISH OFF
	CAIN	T1,"$"		;WANT AN ESCAPE?
	MOVEI	T1,33		;YES - GET ONE
	CAIN	T1,"^"		;WANT A CONTROL CHARACTER?
	PUSHJ	P,XCWXOC	;YES - CONVERT THE NEXT CHARACTER
	PUSHJ	P,XCTWO1	;SAVE THE CHARACTER
	JRST	XCWXO1		;AND GET ANOTHER

XCWXOC:	ILDB	T1,PT		;GET THE CONTROL CHARACTER
	CAIE	T1,"$"		;WANT A REAL DOLLAR SIGN,
	CAIN	T1,")"		;  OR CLOSE PAREN?
	POPJ	P,		;YES - GO SAVE IT
	ANDI	T1,37		;NO - MAKE IT A CONTROL CHARACTER
	POPJ	P,		;RETURN TO SAVE IT

XCWXOE:	MOVEI	T1,177		;END THE STRING
	PUSHJ	P,XCTWO1
	JRST	XCWRT1		;AND GET MORE INPUT

;HERE FOR IF-ROW, -COLUMN, OR -COUNTER

XCWCNF:	ILDB	T1,PT		;GET CONDITION OF THE IF (G, L, E, N)
	ANDI	T1,137		;CONVERT LOWER CASE TO UPPER
	CAIN	T1,"G"		;GREATER?
	TRO	T2,2		;YES - SET FLAG
	CAIN	T1,"L"		;LESS?
	TRO	T2,3		;YES - SET FLAGS
	CAIN	T1,"E"		;EQUAL?
	TRO	T2,4		;YES - SET FLAG
	CAIN	T1,"N"		;NOT EQUAL?
	TRO	T2,5		;YES - SET FLAGS
	TRNN	T2,7		;ARE ANY FLAGS AT ALL SET?
	JRST	XCWERR		;NO - ERROR
	ILDB	T1,PT		;YES - GET FIRST DIGIT OF ROW OR COLUMN
	JRST	XCWRP0		;READ AND SAVE NUMBER OF ROW OR COLUMN

XCWRPT:	PUSH	P,[100]		;STACK THE END-REPEAT CHARACTER
	MOVEI	T2,"^"		;ANNOUNCE START OF COUNT
	PUSHJ	P,XCTWO2
	MOVEI	T2,140		;GET FLAGS TO INDICATE A "DO"
XCWRP0:	HRREI	T3,-60(T1)	;CONVERT CHARACTER TO A DIGIT
	JUMPL	T3,XCWERR	;ERROR IF NOT NUMERIC
XCWRP1:	ILDB	T1,PT		;GET NEXT CHARACTER
	CAIG	T1,"9"		;NUMERIC?
	CAIGE	T1,"0"
	JRST	XCWRP2		;NO - END OF COUNT
	SUBI	T1,"0"		;MAYBE - CONVERT TO A DIGIT
	IMULI	T3,^D10		;SHIFT OVER THE OLD STUFF
	ADD	T3,T1		;PUT NEW DIGIT IN
	JRST	XCWRP1		;AND GET ANOTHER ONE

XCWRP2:	TRNN	T2,40		;GOT DO, OR FR/FC/F.?
	JRST	XCWRP3		;FR/FC/F. - PUT COUNT IN ONE BYTE
	ROT	T3,-7		;GET HIGH-ORDER COUNT BITS
	OR	T2,T3		;SET THEM IN FLAG WORD
	ROT	T3,7		;GET LOW BITS BACK
XCWRP3:	PUSHJ	P,XCTWO2	;SAVE FLAGS AND HIGH BITS
	PUSHJ	P,XCTWO3	;SAVE REST OF REPEAT COUNT
XCWRPX:	CAIN	T1,"("		;GOT START OF THE REPEAT BLOCK?
	AOJA	T0,XCWRT1	;YES - IGNORE IT
	AOJA	T0,XCWR1A	;ELSE PROCESS CHARACTER, WHATEVER IT IS

XCWRPE:	MOVEI	T1,"^"		;MARK THE END OF THE REPEAT SECTION
	PUSHJ	P,XCTWO1
	POP	P,T1		;GET FLAVOR OF REPEAT
	PUSHJ	P,XCTWO1	;STORE IT
	SOJA	T0,XCWRT1	;GET NEXT CHARACTER

XCWEND:	SETZ	T1,		;END BUFFER WITH A NULL
	IDPB	T1,T4
	MOVEI	T2,1		;AND SET END-OF-DATA FLAG IN LAST WORD
	ORM	T2,(T4)
	HRLI	T4,010700	;MAKE FREE POINTER BE START OF NEXT WORD
	MOVEM	T4,XCFPTR	;SAVE IT
	EXCH	T1,XCTLVL	;CLEAR OVERFLOW FLAG
	JUMPL	T1,XCVERR	;ERROR IF IT OVERFLOWED
	JUMPG	T0,XCWEN1	;ERROR IF SOME CONDITIONAL NOT CLOSED
	TLZN	F,FLG		;WANT TO RETURN (TO SWHMNY)?
	JRST	XCTEND		;NO
	POPJ	P,		;YES

XCWEN1:	POP	P,T1		;POP SAVED CONDITIONALS OFF STACK
	SOJG	T0,XCWEN1	;THEN GIVE ERROR MESSAGE
	MOVEI	T1,[ASCIZ /###Conditional block not closed/]
	JRST	ERROR
XCWERR:	MOVEI	T1,[ASCIZ /#########Bad command name/]
	JRST	ERROR

XCTWO3:	IDPB	T3,T4		;OUTPUT CHARACTER IN T3
	JRST	XCTWOU
XCTWO2:	IDPB	T2,T4		;I MEAN IN T2
	JRST	XCTWOU
XCTWO1:	IDPB	T1,T4		;I MEAN IN T1
XCTWOU:	CAME	T4,XCTOVF	;IS BUFFER ABOUT TO OVERFLOW?
	POPJ	P,		;NO - O.K.
	MOVEI	T1,1		;LIGHT END-OF-DATA BIT
	ORM	T1,(T4)
	PUSHJ	P,XCGARB	;DO A GARBAGE COLLECT
	MOVEI	T1,1		;CLEAR THE END-OF-DATA BIT
	ANDCAM	T1,(T4)
	CAME	T4,XCTOVF	;WAS ANYTHING RECOVERED?
	POPJ	P,		;YES - DONE
	MOVE	T4,XCTACW	;NO - RESET CURRENT WRITE POINTER
	MOVE	T4,XCTADR(T4)
	SETOM	XCTLVL		;NOTE THAT BUFFER OVERFLOWED
	POPJ	P,		;READ REST OF BUFFER

;SUBROUTINE TO GARBAGE COLLECT THE EXECUTE FREE SPACE (XCTFRE)
;RETURNS POINTER TO LOWEST FREE ADDRESS IN T4
;USES T0-T3

XCGARB:	MOVEI	T4,XCTFRE-1	;POINT TO START OF FREE SPACE
XCGAR1:	MOVEI	T0,-1		;LOOK FOR SMALLEST POINTER - START BIG
	MOVEI	T3,XBFNUM-1	;LOOK THROUGH ALL BUFFER POINTERS
XCGAR2:	SKIPE	T1,XCTADR(T3)	;IS THIS POINTER ACTIVE?
	CAILE	T4,(T1)		;YES - IS ADDRESS GREATER THAN START OF F.S.?
	JRST	XCGAR3		;NOT ACTIVE OR TOO SMALL - GET ANOTHER
	CAIG	T0,(T1)		;IS ADDRESS LESS THAN LOWEST SO FAR?
	JRST	XCGAR3		;NO - SKIP IT
	HRR	T0,T1		;YES - SAVE NEW ONE INSTEAD
	MOVE	T2,T3		;SAVE INDEX, TOO
XCGAR3:	SOJGE	T3,XCGAR2	;LOOP THROUGH ALL POINTERS
	CAIN	T0,-1		;IS THERE A LOWEST POINTER?
	JRST	XCGARD		;NO - FINISH OFF

	MOVE	T3,T0		;PUT ADDRESS IN AN INDEXABLE AC
	HRRM	T4,XCTADR(T2)	;SAVE NEW POINTER TO BUFFER DATA
XCGAR4:	MOVE	T1,1(T3)	;GET A WORD
	MOVEM	T1,1(T4)	;SAVE IT
	TRNE	T1,1		;END OF THE DATA?
	JRST	XCGAR5		;YES - FINISH
	AOJ	T3,		;NO - BUMP POINTERS
	AOJA	T4,XCGAR4	;  AND LOOP

XCGAR5:	CAME	T3,T4		;DONE MOVING - WAS IT REALLY A MOVE?
	SETZM	T1,1(T3)	;YES - CLEAR FLAG IN OLD LAST WORD
	AOJA	T4,XCGAR1	;DO ANOTHER PASS TO FIND NEXT DATA TO MOVE

XCGARD:	HRLI	T4,010700	;MAKE F.S. ADDRESS INTO A POINTER
	POPJ	P,		;RETURN

;HERE TO WRITE THE ACTIVE BUFFER
;AND THEN EXECUTE IT THE GIVEN NUMBER OF TIMES

XCTXCT:	TRZE	F,XSV		;WAS A BUFFER OPEN?
	PUSHJ	P,XCTWIP	;YES - CLOSE IT
	MOVE	PT,[POINT 7,PARBUF,6] ;POINT TO 2ND CHARACTER OF PARAMETER
	MOVE	T4,[POINT 7,PARBUF]   ;AND TO ITS START
XCTXC1:	ILDB	T1,PT		;SHIFT EXECUTE COUNT LEFT A NOTCH
	CAIL	T1,"0"		;IS THIS A DIGIT?
	CAILE	T1,"9"
	JRST	XCTXC2		;NO - GOT IT ALL
	IDPB	T1,T4		;YES - SAVE IT AND GET MORE
	JRST	XCTXC1

XCTXC2:	CAIE	T1,":"		;DOES THE NUMBER END WITH A COLON?
	PUSHJ	P,XCBKPT	;NO - BACK UP OVER THE LATEST CHARACTER
	SETZ	T1,		;END COUNT WITH A NULL
	IDPB	T1,T4
	TLO	F,FLG		;SET TO GET A RETURN FROM XCTWRT
	PUSHJ	P,XCWRT0	;WRITE INTO THE BUFFER
	JRST	EXCUT0		;SET UP AND EXECUTE THE NEW BUFFER

;SUBROUTINE TO BACK UP THE POINTER IN AC PT A NOTCH
;NOT USED MUCH. WHY SPEND TWO EXTRA INSTRUCTIONS?

XCBKPT:	ADD	PT,[70000,,0]
	JUMPGE	PT,CPOPJ
	SUB	PT,[430000,,1]
	POPJ	P,

;HERE TO OUTPUT THE CONTENTS OF THE ACTIVE BUFFER IN WRITE FORMAT

XCTRDW:	MOVE	T1,[260700,,PARBUF]
	CAMN	T1,PARPTR	;HAS A NAME BEEN GIVEN?
	JRST	XCRDWC		;NO - READ THE ACTIVE BUFFER
	PUSHJ	P,XCTFND	;YES - SET UP THAT BUFFER FIRST
XCRDWC:	TRZE	F,XSV		;SAVING COMMANDS?
	PUSHJ	P,XCTWIP	;YES - STOP, AND WIPE OUT THIS ONE
	SKIPGE	PT,XCTACW	;POINT TO ACTIVE EXECUTE BUFFER - ANY?
	JRST	XCOERR		;NO - ERROR
	MOVE	PT,XCTADR(PT)	;YES - GET POINTER
	MOVE	TY,[POINT 7,PARBUF] ;WRITE TO PARAMETER BUFFER
	MOVEI	T1,"W"		;START IT OFF
	IDPB	T1,TY
	JRST	XCRDL0		;GO OUTPUT THE BUFFER'S CONTENTS

;HERE TO OUTPUT NAME AND CONTENTS OF ACTIVE BUFFER IN SWITCH FORMAT

XCTRDL:	MOVE	T1,[260700,,PARBUF]
	CAMN	T1,PARPTR	;HAS A NAME BEEN GIVEN?
	JRST	XCRDLC		;NO - READ THE ACTIVE BUFFER
	PUSHJ	P,XCTFND	;YES - SET UP THAT BUFFER FIRST
XCRDLC:	TRZE	F,XSV		;SAVING COMMANDS?
	PUSHJ	P,XCTWIP	;YES - STOP, AND WIPE OUT THIS ONE
	SKIPGE	T2,XCTACW	;GET NAME OF ACTIVE EXECUTE BUFFER - ANY?
	JRST	XCOERR		;NO - ERROR
	MOVE	TY,[POINT 7,PARBUF] ;WRITE TO PARAMETER BUFFER
	MOVE	T1,[ASCII ?/X:?] ;START IT OFF
	PUSHJ	P,PUTSQ1
	MOVE	PT,XCTADR(T2)	;GET POINTER TO BUFFER
	MOVE	T1,XCTNAM(T2)
	TRZ	T1,1		;CLEAR FLAG BIT IN NAME
	CAIE	T1,0		;IS NAME NULL
	PUSHJ	P,PUTSQ1	;NO - OUTPUT IT
	SKIPE	T1,XCTKEY(T2)	;GOT A KEY SEQUENCE, TOO?
	PUSHJ	P,XCTRDK	;YES - OUTPUT IT
	MOVEI	T1,":"		;SEPARATE NAME AND CONTENTS
	IDPB	T1,TY

XCRDL0:	ILDB	T1,PT		;GET A CHARACTER
	JUMPE	T1,XCREND	;IF NULL FINISH OFF
	CAIN	T1,"^"		;SPECIAL FLAG?
	JRST	XCRSPC		;YES - HANDLE SEPARATELY
	CAIGE	T1," "		;CONTROL CHARACTER?
	JRST	XCRCTL		;YES - HANDLE SEPARATELY
	CAIN	T1,"$"		;WANT A REAL DOLLAR SIGN?
	JRST	[MOVEI T0,"^"	;YES - DISPLAY IT AS UP-ARROW DOLLAR SIGN
		 IDPB  T0,TY
		 JRST  .+1]
XCRDL1:	IDPB	T1,TY		;YES - OUTPUT IT
XCRDL2:	HRRZ	T1,TY		;IS THERE ROOM IN THE BUFFER FOR THE CHARACTER?
	CAIL	T1,PARBUF+PARBLN
	JRST	XCRENF		;NO - FINISH OFF NOW
	JRST	XCRDL0		;AND GET ANOTHER

XCRSPC:	HRRZ	T1,TY		;IS THERE LIKELY TO BE ROOM IN THE BUFFER?
	CAIL	T1,PARBUF+PARBLN-1
	JRST	XCRENF		;NO - FINISH OFF NOW
	ILDB	T1,PT		;GET CHARACTER AFTER SPECIAL FLAG
	CAIN	T1,"^"		;WANT A REAL UP-ARROW?
	JRST	[IDPB T1,TY	;YES - OUTPUT TWO ARROWS TO SHOW IT'S REAL
		 JRST XCRDL1]
	CAIN	T1,77		;RESET COMMAND?
	JRST	[SETZ T1,	;YES - GET THE RIGHT CODE
		 JRST XCRCTL]
	TRNE	T1,100		;GOT SOME KIND OF CONDITIONAL?
	JRST	XCRRPT		;YES - HANDLE SEPARATELY
	CAIGE	T1,40		;GOT AN EXIT OR CONTINUE, OR OTHER?
	JRST	XCRCON		;YES - GET STRING FROM CONDITIONAL TABLE
XCRCTL:	MOVE	T1,CMDNAM(T1)	;GET COMMAND NAME
XCRCT1:	PUSHJ	P,PUTSQ1	;OUTPUT IT
	JRST	XCRDL2		;BACK TO THE FLOW

XCRCON:	MOVE	T1,CMDCON(T1)	;GET STRING FROM THE CONDITIONAL TABLE
	TRZ	T1,177		;CLEAR OUT FLAGS
	CAME	T1,[ASCIZ /^OU(/] ;GOT AN OUTPUT COMMAND?
	JRST	XCRCT1		;NO - PROCESS IT NORMALLY
	PUSHJ	P,PUTSQ1	;YES - OUTPUT IT
	MOVEI	T2,"^"		;GET AN UP-ARROW FOR SAVING
XCRCN1:	ILDB	T1,PT		;GET A CHARACTER OF THE OUTPUT STRING
	CAIN	T1,177		;END OF STRING?
	JRST	XCRCNE		;YES - FINISH OFF
	CAIE	T1,"$"		;GOT A REAL DOLLAR SIGN,
	CAIN	T1,")"		;  OR CLOSE PAREN?
	IDPB	T2,TY		;YES - PRECEDE WITH AN UP-ARROW
	CAIGE	T1,40		;CONTROL CHARACTER?
	PUSHJ	P,XCRCNC	;YES - OUTPUT SPECIALLY
	IDPB	T1,TY		;OUTPUT THE CHARACTER
	JRST	XCRCN1		;AND GET MORE

XCRCNC:	CAIN	T1,33		;ESCAPE?
	JRST	[MOVEI T1,"$"	;YES - OUTPUT AS A DOLLAR SIGN
		 POPJ  P,]
	IDPB	T2,TY		;NO - PRECEDE WITH AN UP-ARROW
	ADDI	T1,100
	POPJ	P,		;THEN OUTPUT THE CONTROL CHARACTER AND FINISH

XCRCNE:	MOVEI	T1,")"		;END STRING WITH A CLOSE PAREN
	IDPB	T1,TY
	JRST	XCRDL0		;AND GET MORE OF THE BUFFER

;HERE IF SOME KIND OF CONDITIONAL IS FOUND

XCRRPT:	TRNN	T1,76		;ENDING A REPEAT BLOCK?
	JRST	XCRRPE		;YES - DO SO
	TRNE	T1,40		;GOT AN ITERATED DO?
	JRST	XCRRPD		;YES - HANDLE SPECIALLY
	TRNE	T1,30		;GOT AN IF-ROW, -COLUMN, OR -COUNTER?
	JRST	XCRRPF		;YES - HANDLE SPECIALLY
	TRNE	T1,4		;GOT AN IF-CHARACTER?
	SKIPA	T2,CMDCON+3	;YES - GET ITS SEQUENCE
	MOVE	T2,CMDCON+4	;NO - GET SEQUENCE FOR DO-WHILE
	TRZ	T2,177		;CLEAR OUT FLAGS
	EXCH	T1,T2		;GET READY TO OUTPUT THE SEQUENCE
	TRNE	T2,1		;WANT A "NOT" FLAG?
	ORI	T1,57260	;YES - SET "^X" IN SEQUENCE (REALLY)
	PUSHJ	P,PUTSQ1	;OUTPUT CONDITIONAL (AND MAYBE THE NOT)
	ILDB	T1,PT		;GET CHARACTER TO CONDITION ON
	CAIN	T1,"("		;IS IT A REAL OPEN PAREN?
	JRST	[MOVEI T0,"^"	;YES - LEAD IT OFF WITH AN UP-ARROW
		 IDPB  T0,TY
		 JRST  .+1]
	IDPB	T1,TY		;OUTPUT CONDITION CHARACTER
	CAIN	T1,"^"		;WANT A CLASS OF CHARACTERS?
	JRST	[ILDB T1,PT	;YES - GET CLASS
		 LDB  T1,[POINT 7,XCTCLS-1(T1),27]
		 IDPB T1,TY	;OUTPUT IT
		 JRST .+1]	;AND CONTINUE
XCRRPX:	MOVEI	T1,"("		;START OFF THE REPEAT BLOCK
	IDPB	T1,TY
	JRST	XCRDL0		;AND BACK TO FLOW

XCRRPF:	TRNE	T1,10		;GOT AN IF-COLUMN?
	SKIPA	T2,CMDCON+1	;YES - GET ITS SEQUENCE
	MOVE	T2,CMDCON	;NO - GET SEQUENCE FOR IF-ROW
	CAIL	T1,130		;OR IS IT REALLY AN IF-COUNTER?
	MOVE	T2,CMDCON+2	;YES - GET THE REAL SEQUENCE
	TRZ	T2,177		;CLEAR OUT FLAGS
	ANDI	T1,7		;ISOLATE CONDITION TYPE
	OR	T2,XCTREL-2(T1)	;SET UP THE RIGHT CONDITION
	MOVE	T1,T2
	PUSHJ	P,PUTSQ1	;OUTPUT THE CONDITIONAL
	ILDB	T1,PT		;GET ROW OR COLUMN NUMBER
	JRST	XCRPD1		;OUTPUT IT AND FINISH OFF

XCRRPD:	MOVEI	T2,"^"		;FLAG NUMBER AS A COUNT
	IDPB	T2,TY
	ILDB	T2,PT		;GET REPEAT COUNT
	DPB	T1,[POINT 5,T2,28]
	MOVE	T1,T2		;PUT IN HIGH-ORDER BITS
XCRPD1:	PUSHJ	P,PUTNUM	;OUTPUT IT
	JRST	XCRRPX		;SAVE CHARACTER AND FLOW

XCRRPE:	MOVEI	T1,")"		;END THE REPEAT BLOCK
	JRST	XCRDL1		;SAVE CHARACTER AND FLOW

XCRENF:	TYPCHI	207		;BEEP TO SHOW ENTIRE BUFFER DIDN'T FIT
XCREND:	SETZ	T1,		;END WITH A NULL
	IDPB	T1,TY
	MOVEM	TY,PARPTR	;SAVE TYPE POINTER AS PARAMETER POINTER
	MOVE	TY,TYPPTR	;POINT BACK TO TYPE BUFFER
	JRST	RECAR1		;PRETEND THIS WAS THE LAST PARAM TYPED

XCTRDK:	MOVEI	T0,","		;SUB. TO OUTPUT KEY SEQUENCE
	IDPB	T0,TY		;OUTPUT THE SEPARATOR
XCTRK1:	SETZ	T0,		;SHIFT IN A CHARACTER
	LSHC	T0,7
	CAIE	T0,177		;GOT A RUBOUT,
	TRNN	T0,140		;  OR CONTROL CHARACTER?
	JRST	[MOVEI T2,"^"	;YES - SIMULATE AS UP-ARROW CHARACTER
		 IDPB  T2,TY	;(RUBOUT IF UP-ARROW "?")
		 CAIE  T0,177
		 TROA  T0,100
		 MOVEI T0,"?"
		 JRST  .+1]
	IDPB	T0,TY		;OUTPUT THE CHARACTER
	JUMPN	T1,XCTRK1	;LOOP THROUGH THEM ALL
	POPJ	P,		;THEN DONE

;HERE TO OUTPUT LIST OF DEFINED NAMES

XCTNML:	PUSHJ	P,SWHBOT	;SET UP THE BOTTOM LINE
	MOVE	T4,XCTACW	;GET THE POINTER TO THE CURRENTLY-ACTIVE BUFFER
	MOVEI	T3,"*"		;AND THE INDICATOR FOR CURRENTLY-ACTIVITY
	MOVEI	T2,XBFNUM-1	;LOOK FOR NAME OF BUFFER
XCNAM1:	SKIPN	T1,XCTNAM(T2)	;GET A NAME - ANY?
XCNAM2:	SOJGE	T2,.-1		;NO - KEEP LOOKING
	JUMPL	T2,SWHNPE	;WHEN DONE, FINISH OFF LIKE THE SWITCH INFO
	CAMN	T4,T2		;ELSE IS THIS THE ACTIVE BUFFER?
	IDPB	T3,TY		;YES - MARK IT AS SUCH
	TRZ	T1,1		;CLEAR FLAG BIT IN NAME
	CAIN	T1,0		;IS THIS THE NULL BUFFER?
	MOVE	T1,[ASCII /<NUL>/] ;YES - SET UP NULL NAME
	PUSHJ	P,PUTSQ1	;OUTPUT NAME
	MOVE	T1,[ASCII / /]	;SEPARATE NAME FROM NEXT NAME
	PUSHJ	P,PUTSQ1
	JRST	XCNAM2		;GET NEXT NAME

;SUBROUTINE TO READ THE BUFFER NAME AND FIND IT AMONG XCTNAM
;RETURNS NAME IN T4; INDEX IN T1. T1/-1 IF NOT FOUND

XCTRED:	MOVE	T2,[POINT 7,T4] ;GET POINTERS TO SOURCE, TARGET OF NAME
	MOVE	PT,[POINT 7,PARBUF,6]
	MOVEI	T4,1		;CLEAR TARGET - NAME WILL HAVE LOW BIT ON
	MOVEI	T3,5		;READ AT MOST 5 CHARACTERS
XCTRD1:	ILDB	T1,PT		;GET NEXT CHARACTER
	JUMPE	T1,XCTRD2	;DONE IF NULL
	CAIL	T1,"a"		;LOWER CASE?
	SUBI	T1,40		;YES - CONVERT TO UPPER
	IDPB	T1,T2		;STORE IT IN TARGET
	SOJG	T3,XCTRD1	;GET ANOTHER CHARACTER
XCTRD2:	MOVEI	T1,XBFNUM-1	;NOW LOOK FOR NAME
	CAME	T4,XCTNAM(T1)	;IS THIS IT?
	SOJGE	T1,.-1		;NO - LOOP
	POPJ	P,		;YES (OR NOT FOUND) - RETURN

;HERE TO LINK CURRENT EXECUTE BUFFER TO THE PUSH OF A BUTTON

XCTBTN:	TRZE	F,XSV		;WAS A BUFFER OPEN?
	PUSHJ	P,XCTWIP	;YES - CLOSE IT
	MOVEI	T1,[ASCIZ /Push any command button, then "G": /]
	PUSHJ	P,PUTBTM	;OUTPUT THE MESSAGE ON BOTTOM LINE
	PUSHJ	P,PROTOF	;UNPROTECT
	PUSHJ	P,PUTTYP	;OUTPUT ALL THIS NOW

	MOVEI	DO,1001		;NOTE THAT IT'S BUTTON TIME
	MOVE	PT,XCTACW	;POINT TO ACTIVE EXECUTE BUFFER
	PUSHJ	P,XCTKLK	;CLEAN OUT OLD KEY, IF ANY
	MOVEI	T2,200000(PT)	;SET EXECUTE BIT AND SAVE FOR SUBTBX
	MOVEM	T2,SAVEAC+6
	MOVEI	PT,XCTKEY(PT)	;MAKE AN ABSOLUTE-ADDRESS POINTER
	HRLI	PT,440700
	MOVEM	PT,SAVEAC+5	;SAVE IT ALSO FOR LATER
IFE TOPS10,<
IFN FTECHO,<
	PUSHJ	P,EKOALL	;ECHO OFF; BREAK ON EVERYTHING
>>
XCTBT1:	GETCHR			;READ A CHARACTER FROM THE TERMINAL IN T1
	CAIE	T1,"g"		;END OF COMMAND?
	CAIN	T1,"G"
	JRST	XCTBT3		;YES - FINISH OFF
	TLNE	PT,760000	;NO - ALREADY GOT 5 CHARACTERS?
	IDPB	T1,PT		;NO - SAVE CHARACTER
	JRST	XCTBT1		;AND GET SOME MORE

XCTBT3:
IFE TOPS10,<
IFN FTECHO,<
	PUSHJ	P,EKONPT	;ECHO ON; BREAK ON NON-PRINTING CHARACTERS
>>
	MOVE	T2,SAVEAC+5	;GET POINTER TO EXECUTE COMMAND SEQUENCE
	SKIPE	(T2)		;GOT A SEQUENCE?
	PUSHJ	P,SUBTBX	;YES - IF IT'S LEGAL CHANGE INPUT TABLE
	JRST	XCTEND		;DONE

;HERE TO READ A FILE OF EXECUTE BUFFER SWITCHES
;CURRENT BUFFERS ARE REPLACED BY THESE

;XCTBW0:	SKIPA	PT,T2
XCTBSW:	TRZE	F,XSV		;WAS A BUFFER OPEN?
	PUSHJ	P,XCTWIP	;YES - CLOSE IT
	MOVE	PT,[POINT 7,PARBUF,6]
	MOVE	T3,[POINT 7,SAVEAC+4]
IFN TOPS10,<
	MOVEI	T4,'XCT'	;GET DEFAULT EXTENSION
>
IFE TOPS10,<
	MOVE	T4,[ASCII /XCT/]
>
	PUSHJ	P,PARSFX	;PARSE THE SPECS INTO SCRATCH AREA
	HRROI	T2,SAVEAC+4	;FIND THE EXECUTE FILE
	PUSHJ	P,SETINP
	JUMPE	T1,XCIERR	;ERROR IF FILE NOT FOUND
XCTSB0:	PUSHJ	P,PIKFRG	;MAKE SURE PICK BUFFER IS NOT FRAGGED
IFN TOPS10,<
	MOVEI	T1,-400		;SET TO READ 400 WORDS
	HRLM	T1,SEDCCL
	INPUT	5,SEDCCL	;READ FILE INTO PICK BUFFER
	RELEAS	5,
>
IFE TOPS10,<
	MOVE	T2,[POINT 7,PIKBUF+PCBSIZ-400]
	SETZ	T3,		;READ THE FILE
	SIN
	CLOSF			;CLOSE IT
	  HALTF
>
	MOVEI	PT,XBFNUM-2	;ZERO ALL EXISTING INFO, EXCEPT DEFAULT BFR
	PUSHJ	P,XCTKLL
	SOJGE	PT,.-1
	PUSHJ	P,XCGARB	;GARBAGE COLLECT (MOVE DEF BFR STUFF TO TOP)
	MOVEM	T4,XCFPTR	;SAVE POINTER TO FIRST FREE WORD OF BUFFER
	MOVE	PT,[POINT 7,PIKBUF+PCBSIZ-400]
XCTSB1:	ILDB	T1,PT		;GET 1ST CHARACTER OF FILE
	JUMPE	T1,XWFERR	;END - ERROR - WRONG FORMAT
	CAIE	T1,"/"		;IS IT A SWITCH?
	JRST	XCTSB1		;NO - LOOP UNTIL START OF SWITCHES
XCTSB2:	PUSHJ	P,SWHMNY	;GO PARSE THE SWITCHES
	ILDB	T1,PT		;GET CHARACTER OF NEXT LINE
	CAIN	T1,"/"		;ANOTHER SWITCH?
	JRST	XCTSB2		;YES - SET IT UP, TOO
	MOVEI	T1,XBFNUM-1	;NO - MAKE LAST (NULL) EXECUTE BUFFER ACTIVE
	MOVEM	T1,XCTACW
	TLZN	F,FLG		;CALLED BY SWHMNX?
	JRST	XCTEND		;NO - FINISH OFF
	POPJ	P,		;YES - RETURN TO IT

;EXECUTE, NO PARAMETER: IF BUFFER IS OPEN, JUST CLOSE IT
;IF ALREADY CLOSED, SET TO DO SAME NUMBER OF ITERATIONS AS LAST TIME

EXCNPM::TRZN	F,XSV		;SAVING COMMANDS?
	JRST	EXCNP1		;NO - SET UP FOR ITERATING
	MOVE	PT,XCTPTW	;YES - GET POINTER TO END OF BUFFER
	PUSHJ	P,XCTCLO	;CLOSE OFF THE BUFFER
	JRST	LOOP		;AND GET A NEW COMMAND

EXCNP1:	MOVE	T3,XCTITR	;GET NUMBER OF ITERATIONS
	SKIPLE	T4,T3		;ANY?
	JRST	EXCUT1		;YES - GO SET IT UP
	MOVEI	T1,[ASCIZ /####Enter number of iterations/]
	JRST	ERROR

;GET A COMMAND FROM THE EXECUTE BUFFER, FROM LOOP

XCTGET::
IFN FTJOUR,<
	TLNE	TM,JRC		;IS THIS A JOURNAL RESTORE?
	JRST	LOPJRN		;YES - GET THE CHARACTER FROM THE JOURNAL
>
	ILDB	T1,XCTPTR	;GET A COMMAND FROM READ BUFFER
	CAIN	T1,"^"		;SPECIAL CHARACTER FLAG?
	JRST	XCTGT1		;YES - HANDLE SPECIALLY
	JUMPN	T1,XCTGTE	;IF GOT A REAL CHARACTER, USE IT
XCTGT0:	MOVE	T1,XCTACR	;ELSE POINT BACK TO START OF BUFFER
	MOVEM	T1,XCTPTR
	SOSG	T2,XCTNUM	;ELSE WANT TO DO ANOTHER ITERATION?
	JRST	XCTDUN		;NO - FINISH OFF OR POP A LEVEL
	PUSHJ	P,XCTWIS	;YES - MAY WANT TO WHISTLE
	JRST	XCTGET		;GO GET FIRST COMMAND

XCTWIS:	TRNN	F,XBN		;DISPLAYING THE EXECUTE,
	TRNE	T2,7		;  OR DON'T WANT TO WHISTLE?
	JRST	XCTSTP		;EITHER - DON'T WHISTLE
	TYPCHI	207		;NEITHER - WHISTLE
XCTSTP:	PUSHJ	P,SRCIPT	;DOES THE USER WANT TO ABORT THE EXECUTE?
	  JRST	XABERR		;YES - DO SO
	POPJ	P,		;NO - PROCEED

XCTGTE::CAIGE	T1," "		;SOME CONTROL CHARACTER?
	JRST	LOOP2		;YES - HANDLE IT
XCTGE1:
IFE TOPS10,<
IFN FTECHO,<
	TDNE	F,[CCH!ENT,,XCT!IMD] ;NO - ENTERING, EXECUTING, GOT ECC, IMD?
	JRST	ALPNUM		;YES - JUMP WITHOUT ECHOING
	TLNN	TM,XCI		;NO - INITIALIZING FOR AN EXECUTE?
	TYPCHA			;NO - ECHO THE REAL CHARACTER
>>
	JRST	ALPNUM		;NO - JUST PUT IT IN FILE OR BUFFER

XCTGT1:	ILDB	T1,XCTPTR	;GET CHARACTER AFTER THE UP-ARROW
	CAIN	T1,"^"		;WANT A REAL UP-ARROW?
	JRST	XCTGE1		;YES - TREAT IT LIKE A NORMAL CHARACTER
	CAIN	T1,77		;GOT A RESET COMMAND?
	JRST	[SETZ T1,	;YES - GET THE REAL CODE AND DISPATCH
		 JRST LOOP2]
	CAIGE	T1,40		;GOT AN EXIT OR CONTINUE, OR SOMETHING?
	JRST	XCTGCT		;YES - GO HANDLE IT
	TRNN	T1,100		;GOT THE START OR END OF A REPEAT?
	JRST	LOOP2		;NO - PROCESS THE COMMAND
	TRNN	T1,76		;END OF A REPEAT?
	JRST	XCTGRX		;YES - GO HANDLE IT

;HERE IF SOME KIND OF CONDITIONAL

	TRNE	T1,40		;GOT AN ITERATED DO?
	JRST	XCGITR		;YES
	TRNE	T1,30		;GOT AN IF-ROW, -COLUMN OR -COUNTER?
	JRST	XCGTRC		;YES
	PUSHJ	P,MAKCPT	;NO - RE-MAKE CHARACTER POINTER
	ILDB	T2,XCTPTR	;GET CHARACTER OR CLASS TO CHECK FOR
	CAIN	T2,"^"		;GOT A CLASS?
	TRO	T1,200000	;YES - SET CLASS FLAG
	PUSHJ	P,XCTCHK	;SEE IF CONDITION IS TRUE
	TRNE	T1,4		;GOT AN IF-CHARACTER?
	JRST	XCGTIF		;YES

;HERE FOR DO-WHILE

	JUMPN	T0,XCTSKB	;IF FALSE SKIP THE BLOCK
	HRL	T2,T1		;ELSE SET UP FLAGS,,CHAR
	TLO	T2,400000	;SET DO-WHILE FLAG
	JRST	XCGIT1		;SAVE STUFF AND DO THE BLOCK

;HERE FOR ITERATED DO

XCGITR:	ILDB	T2,XCTPTR	;GET LOW BITS OF REPEAT COUNT
	DPB	T1,[POINT 5,T2,28] ;PUT HIGH-ORDER BITS IN, TOO
XCGIT1:	JUMPE	T2,XCTSKB	;IF ZERO ITERATIONS, JUST SKIP THE BLOCK
	AOS	T1,XCTLVL	;DROP DOWN A LEVEL OF NESTING
	CAIN	T1,1		;NOW AT LEVEL ONE?
	JRST	XCGIT2		;YES - DON'T SAVE
	PUSH	P,XCTRPR	;SAVE PTR TO START OF BLOCK
	PUSH	P,XCTRPT	;SAVE PREVIOUS REPEAT COUNT
XCGIT2:	MOVEM	T2,XCTRPT	;SAVE COUNT AND FLAGS
	MOVE	T1,XCTPTR	;SAVE POINTER TO START OF BLOCK
	MOVEM	T1,XCTRPR
	JRST	XCTGET		;PICK UP THE FIRST ITERATION

;HERE FOR IF-ROW, IF-COLUMN, IF-COUNTER, AND IF-CHARACTER (XCGTIF)

XCGTRC:	TRNN	T1,10		;GOT AN IF-COLUMN?
	SKIPA	T3,RW		;NO - GET ROW FOR COMPARISON
	MOVE	T3,CM		;YES - GET COLUMN FOR COMPARISON
	ILDB	T2,XCTPTR	;GET VALUE TO COMPARE WITH
	CAIL	T1,130		;IS IT REALLY AN IF-COUNTER?
	SKIPA	T3,XCTCTR	;YES - GET THE COUNTER (DON'T DEC VALUE)
	SOJ	T2,		;IT'S ONE TOO HIGH, SINCE RW & CM ZERO-BASED
	TRNE	T1,4		;WANT EQUALITY?
	JRST	[CAME T3,T2	;YES - ARE THEY EQUAL?
		 JRST XCGRCF	;NO - SET UP FALSE
		 JRST XCGRCT]	;YES - SET UP TRUE
	CAMN	T3,T2		;DON'T WANT EQUALITY - ARE THEY EQUAL?
	JRST	XCTSKB		;YES - IT MUST BE FALSE
	CAML	T3,T2		;NO - IS PARAMETER GREATER THAN VALUE?
XCGRCT:	TDZA	T0,T0		;YES - SET UP TRUE
XCGRCF:	SETO	T0,		;NO - SET UP FALSE
	TRNE	T1,1		;WANT TO NEGATE THE RESULT?
	SETCM	T0,T0		;YES

XCGTIF:	JUMPE	T0,XCTGET	;IF TRUE, KEEP GOING
XCTSKB:	PUSHJ	P,XCTSKP	;ELSE SKIP OVER THE BLOCK
	JUMPE	T1,XCTGT0	;JUMP IF END OF BUFFER
	JRST	XCTGET		;AND GET WHAT COMES AFTERWARDS

;HERE TO SKIP TO END OF A BLOCK AND GET WHAT FOLLOWS

XCTSKP:	SETZ	T0,		;CLEAR COUNT OF BLOCKS PASSED OVER
XCTSK1:	ILDB	T1,XCTPTR	;SKIP OVER NEGATIVE "IF" BLOCK
	JUMPE	T1,CPOPJ	;DONE IF END OF BUFFER
	CAIE	T1,"^"		;START OR END OF A BLOCK?
	JRST	XCTSK1		;NO - KEEP SKIPPING
	ILDB	T1,XCTPTR	;YES - GET FOLLOWING CHARACTER
	TRNE	T1,76		;END OF A BLOCK?
	JRST	XCTSK2		;NO - MAYBE DROP A LITTLE DEEPER
	SOJGE	T0,XCTSK1	;YES - LOOP OF NOT THE RIGHT END
	POPJ	P,		;ELSE DONE

XCTSK2:	TRNE	T1,100		;IS THIS A COMMAND,
	CAIN	T1,"^"		;  OR WANT A REAL UP-ARROW?
	JRST	XCTSK1		;EITHER - SKIP OVER IT
	AOJA	T0,XCTSK1	;ELSE DROP A LEVEL AND KEEP SKIPPING

;HERE FOR AN EXIT OR CONTINUE CONSTRUCT

XCTGCT:	CAILE	T1,7		;GOT AN EXIT OR CONTINUE?
	JRST	@XCTJMP-10(T1)	;NO - DISPATCH TO HANDLE IT
	CAIN	T1,7		;WANT TO END THIS ITERATION (^XX)?
	JRST	XCTGTX		;YES - POP STACK AND DO SO
	MOVE	T2,T1		;NO - SAVE TYPE OF CONSTRUCT
	ILDB	T0,XCTPTR	;GET THE ")" THAT FOLLOWS THE COMMAND
	PUSHJ	P,XCTSKP	;SKIP TO END OF THE BLOCK
	JUMPE	T1,XCTGT0	;JUMP IF END OF BUFFER
	CAIE	T1,100		;IS THIS AN IF CONSTRUCT?
	JRST	XCTGET		;YES - GO EXECUTE FROM HERE
	CAIE	T2,6		;NO - WANT TO EXIT THE BLOCK (^XB)?
	JRST	XCTGXP		;YES - DO SO
				;ELSE FALL TO CONTINUE THE BLOCK

;HERE IF END OF A BLOCK - IGNORE IF ^A (IF); LOOP OR EXIT IF ^@ (^DO)

XCTGRX:	CAIE	T1,100		;END OF DO BLOCK?
	JRST	XCTGET		;NO - IGNORE IT
	TLZE	TM,XCI		;STOP INITIALIZING?
	JRST	XCTGXI		;YES - JUST DE-BUMP LEVEL
	PUSHJ	P,XCTSTP	;SEE IF USER WANTS TO STOP
	SKIPGE	XCTRPT		;GOT A DO-WHILE?
	JRST	XCTGXW		;YES - CHECK CHARACTER AT CURSOR
	SOSG	XCTRPT		;NO - DO-ITR - DE-BUMP COUNTER - DONE?
	JRST	XCTGXP		;YES - POP BACK A LEVEL
XCTGXR:	MOVE	T1,XCTRPR	;NO - GET POINTER TO START OF BLOCK
	MOVEM	T1,XCTPTR	;SAVE IT AS REAL POINTER
	JRST	XCTGET		;AND TAKE COMMANDS FROM THERE

XCTGXW:	PUSHJ	P,MAKCPT	;RE-MAKE CHARACTER POINTER
	HLRZ	T1,XCTRPT	;GET FLAGS
	HRRZ	T2,XCTRPT	;GET CHARACTER OR CLASS TO CHECK FOR
	TRNE	T1,200000	;GOT A CLASS?
	JRST	[SETZ  T0,	;YES - GO CHECK THE CONDITION
		 PUSHJ P,XCTCHC+1
		 JRST  XCGXW1]
	PUSHJ	P,XCTCHK	;NO - CHECK THE CONDITION
XCGXW1:	JUMPE	T0,XCTGXR	;IF TRUE JUST DO THE BLOCK, ELSE POP LEVEL

XCTGXP:	SKIPE	XCTLVL		;SKIP IF STACK IS CLEAR
	SOSG	XCTLVL		;AT BOTTOM LEVEL?
	JRST	XCTGET		;YES - JUST KEEP GOING
	POP	P,XCTRPT	;ELSE GET SAVED COUNT (OR COMPARATOR)
	POP	P,XCTRPR	;AND INITIAL REPEAT POINTER
	JRST	XCTGET		;AND TAKE COMMANDS FROM THERE

XCTGTX:	SKIPE	XCTLVL		;SKIP IF STACK IS CLEAR
XCGTX1:	SOSG	XCTLVL		;POP EVERYTHING OFF THE STACK - ANY LEFT?
	JRST	XCTGT0		;NO - DO ANOTHER ITERATION
	POP	P,XCTRPT	;YES - POP IT OFF ALREADY
	POP	P,XCTRPR
	JRST	XCGTX1		;AND TRY AGAIN

XCTGXI:	SETZM	XCTLVL		;END OF XCT INIT - CLEAR LEVEL
	MOVE	T1,XCTPTR	;GET POINTER TO CURRENT POSITION
	EXCH	T1,XCTACR	;SAVE AS STARTING POINTER
	MOVEM	T1,XCTINI	;SAVE REAL STARTING POINTER, TOO
	JRST	XCTGET		;READ MORE OF BUFFER

;DISPATCH FOR ROUTINES TO HANDLE SPECIAL EXECUTE CONSTRUCTS

XCTJMP:	XCTG10			;(10) ITERATE-COUNTER
	XCTG11			;(11) CLEAR-COUNTER
	XCTG12			;(12) BUMP-COUNTER
	XCTG13			;(13) DE-BUMP-COUNTER
	XCTG14			;(14) USE-COUNTER
	XCTG15			;(15) INITIALIZE
	XCTG16			;(16) OUTPUT
	XCTG17			;(17) SAVE-COUNTER
	XCTG20			;(20) NO-DISPLAY
	XCTG21			;(21) DO-ON-SEARCH-ERROR

XCTG21:	PUSHJ	P,XCTSKP	;NOT A SEARCH ERROR, SO JUST SKIP THE BLOCK
	JRST	XCTGET		;DONE

XCTG20:	TRZE	F,XBN		;TURN OFF BUTTON FLAG - ON?
	TRO	F,XCT		;YES - TURN ON NORMAL EXECUTE FLAG
	JRST	XCTGET		;DONE

XCTG17:	TLZN	F,ENT		;IS THERE A PARAMETER?
	JRST	XCG17A		;NO - USE OLD NOMINAL
	MOVEI	DO,$SETCT	;NOTE THAT THIS IS A SET-COUNTER CONSTRUCT
	MOVE	T4,XCTSNM	;GET LAST TIME'S NOMINAL
	MOVEM	T4,PARG1
	PUSHJ	P,PEEL.1	;READ NEW PARM, IF ANY
	TRNE	F,CMV		;CURSOR MOVEMENT?
	SKIPA	T4,PARG2	;YES -	GET CHANGE IN COLUMNS
	MOVE	T4,PARG1
	MOVEM	T4,XCTSNM	;SAVE AS NEW NOMINAL
XCG17A:	MOVE	T4,XCTSNM	;GET COUNTER SETTING
	MOVEM	T4,XCTCTR	;SAVE AS COUNTER VALUE
	JRST	XCTGET		;DONE

XCTG16:	ILDB	T1,XCTPTR	;GET A CHARACTER TO OUTPUT
	CAIN	T1,177		;END OF STRING?
	JRST	XCG16A		;YES - OUTPUT IT AND FINISH OFF
	IDPB	T1,TY		;NO - SAVE THE CHARACTER
	JRST	XCTG16		;AND GET ANOTHER

XCG16A:	PUSHJ	P,PUTTYP	;OUTPUT THE STRING
	JRST	XCTGET		;AND READ MORE OF THE BUFFER

XCTG15:	TLO	TM,XCI		;INITIALIZE - SET FLAG
	AOS	XCTLVL		;DROP DOWN A LEVEL
	JRST	XCTGET		;READ MORE OF BUFFER

XCTG14:	SKIPGE	T1,XCTCTR	;GET COUNTER - IS IT NEGATIVE?
	SETZ	T1,		;YES - SET TO ZERO
	EXCH	TY,PARPTR	;SAVE OUTPUT POINTER AND GET PARAMETER POINTER
	PUSHJ	P,PUTNUM	;OUTPUT NUMBER TO PARAMETER BUFFER
	EXCH	TY,PARPTR	;SWAP PARAMETER AND OUTPUT POINTERS BACK
	JRST	XCTGET		;READ MORE OF BUFFER

XCTG13:	SOSA	XCTCTR		;DE-BUMP COUNTER
XCTG12:	AOS	XCTCTR		;I MEAN BUMP IT
	JRST	XCTGET		;GET A NEW COMMAND

XCTG11:	SETZM	XCTCTR		;CLEAR THE COUNTER
	JRST	XCTGET

XCTG10:	SKIPGE	T2,XCTCTR	;GET COUNTER - NEGATIVE?
	SETZ	T2,		;YES - USE 0
	JRST	XCGIT1		;USE IT WITH AN ITERATED DO

REPEAT 0,<
;SUBROUTINE TO .OR. A NUMBER OF CHARACTERS OR CONDITIONS FOR ^DW OR ^IF

XCTCKI:	SETZM	SAVEAC+1	;CLEAR THE OVERALL CONDITION FLAG

XCTCI1:	ILDB	T2,XCTPTR	;GET A CHARACTER OR CLASS TO CHECK FOR
	PUSHJ	P,XCTCHK	;CHECK IT OUT
	JUMPG	T0,XCTCI2	;DONE IF END OF BLOCK
	ORM	T0,SAVEAC+1	;OR THIS CONDITION WITH THE OTHERS
	JRST	XCTCI1		;AND CHECK THE NEXT CONDITION

XCTCI2:	MOVE	T0,SAVEAC+1	;GET THE CONDITION FLAG
	POPJ	P,		;DONE

;HERE FOR THE START OR END OF A LIST OF CONDITIONALS

XCTCIE:	CAIN	T2,20		;START OF A LIST OF CONDITIONS?
	JRST	XCTCHI		;YES
	MOVEI	T0,1		;RETURN A POSITIVE VALUE
	POPJ	P,		;DONE
>
;SUBROUTINE TO CHECK TO SEE IF CHARACTER IN T3 MATCHES CHAR OR CLASS IN T2

XCTCHK:	CAIN	T2,"^"		;WANT A CLASS?
	JRST	XCTCHC		;YES - HANDLE SEPARATELY
	CAMN	T3,T2		;NO - GOT THE RIGHT CHARACTER?
XCTCHT:	TDZA	T0,T0		;YES - FLAG AS TRUE
XCTCHF:	SETO	T0,		;NO - FLAG AS FALSE
	TRNE	T1,1		;GOT .NOT. FLAG?
	SETCM	T0,T0		;YES - RETURN THE OPPOSITE RESULT
	POPJ	P,		;DONE

XCTCHP:	MOVE	T1,SAVEAC	;RESTORE SAVED T1
	POPJ	P,		;DONE

XCTCHC:	ILDB	T2,XCTPTR	;GET CLASS TO CHECK FOR
REPEAT 0,<
	CAIL	T2,20		;START OR END OF A CONDITION LIST?
	JRST	XCTCIE		;YES
>
	CAIN	T2,2		;END OF LINE?
	JRST	XCTCHE		;YES
	CAIN	T2,3		;NUMBER?
	JRST	XCTCHN		;YES
	CAIN	T2,5		;SPACE?
	JRST	XCTCHS		;YES

	CAIGE	T3,"A"		;CHECK FOR UPPER, LETTER OR ALPHA-NUM
	JRST	XCTCHM		;NOT LETTER - MAY BE NUMBER
	CAIG	T3,"Z"		;LETTER?
	JRST	XCTCHT		;YES - RETURN TRUE
	CAIN	T2,6		;LOOKING FOR UPPER CASE?
	JRST	XCTCHF		;YES - RETURN FALSE
	CAIL	T3,"a"		;NO - IS IT LOWER CASE?
	CAILE	T3,"z"
	JRST	XCTCHF		;NO - RETURN FALSE
	JRST	XCTCHT		;ELSE TRUE

XCTCHM:	CAIE	T2,4		;NOT ALPHA - WANT ALPHA-NUM?
	JRST	XCTCHF		;NO - RETURN FALSE
XCTCHN:	CAIL	T3,"0"		;CHECK FOR NUMBER - IS IT?
	CAILE	T3,"9"
	JRST	XCTCHF		;NO - RETURN FALSE
	JRST	XCTCHT		;ELSE RETURN TRUE

XCTCHS:	TRNN	T1,1		;CHECKING FOR A CHARACTER?
	JRST	XCCHSS		;NO - CHECK FOR SPACE
	CAIN	T3,15		;YES - END OF LINE?
	JRST	XCTCHT		;YES - RETURN TRUE (NEGATED)
	CAIE	T3," "		;NO - SPACE OR TAB?
	CAIN	T3,11
	JRST	XCTCHT		;YES - RETURN TRUE (NEGATED)
	JRST	XCTCHF		;ELSE RETURN FALSE

XCCHSS:	CAIN	T3," "		;SPACE?
	JRST	XCCHS0		;YES - MAKE SURE IT'S NOT TRAILING
	CAIE	T3,11		;TAB?
	JRST	XCTCHF		;NO - RETURN FALSE

XCCHS0:	MOVEM	T1,SAVEAC	;SAVE T1
	PUSH	P,[XCTCHP]	;SAVE RESTORE-T1 ADDRESS
	TRO	T1,1		;LOOK FOR NON-END OF LINE
XCTCHE:	MOVE	T4,CHRPTR	;GET CURSOR POINTER
XCCHE0:	CAIN	T3,15		;AT END OF LINE?
	JRST	XCTCHT		;YES - RETURN TRUE
	CAIN	T3," "		;NO - GOT A (MAYBE TRAILING) SPACE?
	JRST	XCCHE1		;YES - SKIP IT
	CAIE	T3,11		;HOW ABOUT A (MAYBE TRAILING) TAB?
	JRST	XCTCHF		;NO - RETURN FALSE
XCCHE1:	ILDB	T3,T4		;YES - GET NEXT CHARACTER
	JUMPE	T3,.-1		;IGNORE NULLS
	JRST	XCCHE0		;GO CHECK THE REAL CHARACTER

;HERE AT END OF EXECUTE BUFFER - FINISH OFF OR POP UP A LEVEL

XCTDUN:	SKIPN	T1,XCTPSV	;GOT A SAVED POINTER?
	JRST	XCTDN1		;NO - REALLY DONE
	SETZ	T1,		;YES - GET READY TO ZERO THINGS
	EXCH	T1,XCTPSV	;GET AND ZERO SAVED POINTER
	MOVEM	T1,XCTPTR	;MAKE IT ACTIVE AGAIN
	MOVE	T1,XCTASV	;GET SAVED STARTING POINTER
	MOVEM	T1,XCTACR	;SET IT UP
	MOVE	T1,XCTISV	;GET NOMINAL SAVED ITERATIONS
	MOVEM	T1,XCTITR	;SET THEM UP, TOO
	MOVE	T1,XCTNSV	;GET SAVED ITERATIONS
	MOVEM	T1,XCTNUM	;SET THEM UP, TOO
	JRST	XCTGET		;AND CONTINUE WITH THEM

XCTDN1:	TRNE	F,XBN		;DID USER PUSH A SPECIAL BUTTON?
	TLO	F,FLG		;YES - REMEMBER IT
	EXCH	T1,XCTASV	;GET AND ZERO SAVED STARTING POINTER
	JUMPE	T1,XCTDN2	;IS THERE ONE?
	MOVEI	T2,XBFNUM-1	;YES - FIND ITS INDEX
	CAME	T1,XCTADR(T2)	;IS THIS IT?
	SOJGE	T2,.-1		;NO - TRY NEXT ONE
	MOVEM	T2,XCTACW	;SAVE INDEX AS THE ACTUAL ACTIVE BUFFER
XCTDN2:	MOVE	TY,TYPPTR
	MOVS	T1,[PARAMS,,SAVPRM]
	BLT	T1,PARAMS+SAVPML-1 ;RESTORE ALL PARAMETERS
	HRRZ	T1,SAVFGS	;RESTORE PREVIOUS F SWITCH FLAGS
	TRZ	F,SWFLGS
	ANDI	T1,SWFLGS
	OR	F,T1
	HLLZ	T1,SAVFGS	;RESTORE PREVIOUS TM SWITCH FLAGS
	TLZ	TM,BEP!LSD!JRC
	AND	T1,[BEP!LSD!JRC,,0]
	OR	TM,T1
	SKIPE	T1,XCTINI	;IS THERE AN INITIAL POINTER?
	MOVEM	T1,XCTACR	;YES - SET IT UP AS STARTING POINTER
	SETZM	XCTINI		;CLEAR INITIAL POINTER
	MOVEI	T1,1
	TRNE	F,RST		;WANT TO RESTORE THE NOMINAL PARAMETER?
	MOVEM	T1,XCTITR	;YES - SET IT BACK TO 1
	TLZ	F,ENT		;DON'T ALLOW THE USER TO LEAVE ENTER IN EFFECT
	TLZE	F,FLG		;DID USER PUSH A SPECIAL BUTTON?
	JRST	LOOP		;YES - SCREEN IS ALREADY O.K.
	JRST	DISALL		;NO - RE-DISPLAY SCREEN AND LOOP

;EXECUTE ERROR MESSAGES

XSXERR:	MOVEI	T1,[ASCIZ /####Execute stacked too deeply/]
	SETZM	XCTPSV
	JRST	ERROR
XSCERR:	SKIPA	T1,[[ASCIZ /Counter must have a numeric parameter/]]
XWFERR:	MOVEI	T1,[ASCIZ /####Bad format for execute file/]
	JRST	ERROR

XCIERR:
IFN TOPS10,<
	MOVSI	T1,'TED'	;TRY FOR FILE ON THE TEXT EDITOR DEVICE
	MOVEM	T1,GENBLK+1
	PUSHJ	P,SETINP	;SEE IF IT'S THERE
	JUMPN	T1,XCTSB0	;IF THERE, USE IT
>
	MOVEI	T1,[ASCIZ /#######Execute file not found/]
	JRST	ERROR
XCXERR:	MOVEI	T1,[ASCIZ /######Current buffer is empty/]
	JRST	ERROR
XCOERR:	MOVEI	T1,[ASCIZ /########No buffer is active/]
	JRST	ERROR
XCSERR:	MOVEI	T1,[ASCIZ /#No free buffers - kill something/]
	JRST	ERROR
XCNERR:	MOVEI	T1,[ASCIZ /##No execute buffer by that name/]
	JRST	ERROR
XCEERR::MOVEI	T1,[ASCIZ /####Start or end of file reached/]
	SKIPA	TY,TYPPTR
XCKERR:	MOVEI	T1,[ASCIZ /####Can't kill - name not found/]
	JRST	ERROR
XABERR:	MOVEI	T1,[ASCIZ /#########Execution stopped/]
	JRST	ERROR
XCTERR::MOVE	PT,XCTPTW	;GET POINTER TO BUFFER CONTENTS
	PUSHJ	P,XCTCLO	;CLOSE OFF THE BUFFER
	TRZ	F,XSV		;STOP SAVING
	MOVEI	T1,[ASCIZ /Execute buffer is about to overflow/]
	JRST	ERROR
XCVERR:	MOVE	T1,XCTACW	;CLEAR OVERFLOWED BUFFER
	MOVE	T1,XCTADR(T1)
	SETZM	@1(T1)
	MOVEI	T1,[ASCIZ /#####Execute buffer overflowed/]
	JRST	ERROR

	END