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; UPD ID= 1035 on 4/29/83 at 12:05 AM by NIXON                          
TITLE	MOVE FOR COBOTS
SUBTTL	MOVE A STRING OF CHARACTERS	/ACK

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;THIS SOFTWARE IS FURNISHED UNDER A LICENSE AND MAY ONLY BE USED
;  OR COPIED IN ACCORDANCE WITH THE TERMS OF SUCH LICENSE.

COPYRIGHT (C) 1974, 1983, 1984 BY DIGITAL EQUIPMENT CORPORATION

	SEARCH	LBLPRM		;DEFINE PARAMETERS.
	%%LBLP==:%%LBLP
	DEBUG==:DEBUG
	EXTERN	EASTB.		;FORCE EASTBL TO BE LOADED.
	HISEG
	.COPYRIGHT		;Put standard copyright statement in REL file

;REVISION HISTORY:
;V10 *****
;	15-DEC-74	/ACK	CREATION.
;	26-JAN-75	/ACK	REWRITTEN - BAD REGISTER ALLOCATION.
;				 (T1 AND CH WERE THE SAME REGISTER, WHICH
;				 SCREWED UP BLT'S.)
;	5/10/75		/DBT	BIS CODE
;*****

COMMENT	\
	THIS ROUTINE MOVES A STRING OF CHARACTERS FROM ONE PLACE TO ANOTHER.
	MOVEI	16,PARAMETER ADDRESS
	PUSHJ	17,MOVE.
PARAMETERS:
	WORD 1:
		BYTE POINTER TO THE INPUT STRING.
	WORD 2:
		BITS	0-5	BYTE POINTER RESIDUE FOR THE OUTPUT STRING.
		BIT	6	IGNORED (1 IF THE FIELD IS EXPLICTLY SIGNED.)
		BITS	7-17	SIZE OF THE FIELDS.
		BITS	18-35	ADDRESS OF THE FIRST BYTE OF THE OUTPUT FIELD.
RETURNS:
	CALL+1	ALWAYS.
REGISTERS USED:
	JAC, CNT, CH, TAC2, TAC3, TAC4, IPTR, OPTR
\

	ENTRY	MOVE.
	ENTRY	MVD.AL		;MOVE ALL "LIT" TO DEPENDING VARIABLE
	EXTERN	SET2.		;ROUTINE TO PICK UP THE PARAMETERS.
	EXTERN	RET.1		;RETURNS TO CALL+1.
	EXTERN	PTIBS.		;POINTER TO THE INPUT BYTE SIZE.
	EXTERN	PTOBS.		;POINTER OT THE OUTPUT BYTE SIZE.
	T1==TAC2
	T2==TAC2+1	;ALSO KNOWN AS TAC3.
	T3==TAC4

;MAKE SURE THAT THE REGISTERS DON'T GET SCREWED UP.

	CHKREG==0
	IFN CNT-SRCCNT,<CHKREG==1>
	IFE SRCPT-CNT,<CHKREG==1>
	IFE SRCPT-OPTR,<CHKREG==1>
	IFE DSTCNT-OPTR,<CHKREG==1>
	IFN CHKREG,<
	PRINTX	?MOVE IS BROKEN - BAD REGISTER ALLOCATION - CHECK LISTING.
	CNT==CNT
	SRCCNT==SRCCNT
	SRCPT==SRCPT
	DSTCNT==DSTCNT
	OPTR==OPTR
>

MOVE.:	JSP	JAC,	SET2.		;GO PICK UP THE PARAMETERS.
	EXP		RET.1		;RETURN THROUGH HERE ON A NULL STRING.
	LDB	T3,	PTIBS.		;GET THE INPUT BYTE SIZE.
	DPB	T3,	PTOBS.		;MAKE IT THE OUTPUT BYTE SIZE.
	CAIG	CNT,	^D15		;WORTH TRYING TO BLT?
	JRST		MOVE4		;NO, GO MOVE CHAR'S.
	HLRZ	T1,	IPTR
	HLRZ	T2,	OPTR
	CAIE	T1,	(T2)		;IS A BLT POSSIBLE?
	JRST		MOVE4		;NO, GO MOVE CHAR'S.
;THE FOLLOWING LOOP SHOULD BE EXECUTED AT MOST FIVE TIMES.
	TRZ	T1,	770077		;BYTE SIZE IN BITS 24-29.
MOVE1:	LDB	T2,	[POINT 12,IPTR,11]	;NUMBER OF BITS LEFT.
	CAIG	T2,	(T1)		;LESS THAN ONE BYTE LEFT?
	AOJA	IPTR,	MOVE2		;YES, GO MOVE UP TO NEXT WORD AND BLT.
	CAIL	T2,	4400		;ARE WE AT A WORD BOUNDARY?
	JRST		MOVE3		;YES, GO BLT.
	ILDB	CH,	IPTR		;MOVE UP ONE BYTE.
	IDPB	CH,	OPTR
	SOJG	CNT,	MOVE1		;LOOP.
IFE DEBUG,<
	POPJ	PP,			;THIS CAN'T HAPPEN! (BUT JUST IN
					; CASE - NO HARM DONE.)
>
IFN DEBUG,<
	OUTSTR	[ASCIZ	/
%MOVE fell through while looking for a word boundary at MOVE1+8 in MOVE.
/]
	HALT		RET.1
>

;MOVE UP TO THE NEXT WORD BECAUSE THERE IS LESS THAN 1 BYTE LEFT IN
; THIS ONE, THIS SHOULD ONLY HAPPEN FOR ASCII.
MOVE2:	ADDI	OPTR,	1
	MOVEI	CH,	44
	DPB	CH,	[POINT 6,IPTR,5]
	DPB	CH,	[POINT 6,OPTR,5]
;WE CAN BLT AT LEAST ONE WORD.
MOVE3:	IDIV	CNT,	CHPRWD-6(T3)	;NUMBER OF WORDS TO TRANSFER (NOTE:
					; NUMBER OF CHARACTERS LEFT IS IN CH).
	HRRI	T2,	(OPTR)		;DESTINATION.
	HRLI	T2,	(IPTR)		;SOURCE.
	ADDI	OPTR,	(CNT)		;LAST WORD IN DESTINATION + 1.
	BLT	T2,	-1(OPTR)	;FINALLY!!
	JUMPE	CH,	RET.1		;ANY MORE BYTES?
	ADDI	IPTR,	(CNT)		;YES, UPDATE THE SOURCE POINTER.
	MOVEI	CNT,	(CH)		;AND THE COUNT.
;COME HERE WHEN ALL ELSE FAILS.

MOVE4:	MOVE	SRCPT,IPTR		;SET UP THE AC'S FOR THE
	MOVE	DSTCNT,CNT		; MOVSLJ.
	MOVE	DSTPT,OPTR
	EXTEND	CNT,[MOVSLJ]		;DO THE MOVE.
	  JRST	XTND.E
	POPJ	PP,			;DONE

	INTERN	XTND.E
XTND.E:	OUTSTR	[ASCIZ	/?Error return from Extend instruction./]
	JRST	KILL.##

;HERE FOR "MOVE ALL "LIT" TO DEPENDING VARIABLE"

;CALL: AC4/ SIZE OF LIT
;	AC7/ COMPUTED SIZE OF "B"
;	AC5/ BYTE PTR TO "A"
;	AC10/ BYTE PTR TO "B"
; NOTE: THE BYTE SIZES MUST BE EQUAL!!
;RETURNS: .+1 ALWAYS

;THIS ROUTINE SMASHES ACS 4 THRU 12 INCLUSIVE

MVD.AL:	CAMLE	7,4		;JUST 1 OCCURANCE OR LESS?
	 JRST	MVDAL1		;NO, MORE

	JUMPLE	7,RET.1		;JUMP IF NOTHING TO DO
	ILDB	6,5		;GET A CHAR
	IDPB	6,10		;AND STORE IT
	SOJG	7,.-2		; UNTIL DONE
	POPJ	PP,		; THEN RETURN

MVDAL1:	MOVE	11,10		;SAVE FIRST BP TO "B"
	MOVE	12,4		;SAVE # CHARS IN LITERAL
	ILDB	6,5		;GET A CHAR
	IDPB	6,10		; AND STORE IT
	SOJG	4,.-2		;LOOP FOR ALL CHARS IN THE LITERAL

	SUBI	7,(12)		;GET # CHARS LEFT TO MOVE
	MOVE	5,11		;NOW MOVE FROM THE BEGINNING OF "B"
	ILDB	6,5		;TO WHERE WE LEFT OFF
	IDPB	6,10		;. .
	SOJG	7,.-2		;UNTIL "B" IS FILLED UP
	POPJ	PP,		; THEN RETURN

;TABLE OF CHARACTERS PER WORD:

CHPRWD:	EXP	6
	EXP	5
	EXP	0
	EXP	4

	END