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 %TITLE 'WFRESEQ - resequence a range of lines'
MODULE WFRESEQ (				! Resequence a range of lines
		IDENT = '3-001'			! File: WFRESEQ.BLI Edit: GB3001
		) =
BEGIN
!COPYRIGHT (c) DIGITAL EQUIPMENT CORPORATION 1981, 1988.  ALL RIGHTS RESERVED.
!
!THIS SOFTWARE IS FURNISHED UNDER A LICENSE AND MAY BE USED AND COPIED ONLY
!IN ACCORDANCE WITH THE TERMS OF SUCH LICENSE AND WITH THE INCLUSION OF 
!THE ABOVE COPYRIGHT NOTICE.  THIS SOFTWARE OR ANY OTHER COPIES THEREOF MAY 
!NOT BE PROVIDED OR OTHERWISE MADE AVAILABLE TO ANY OTHER PERSON.  NO TITLE
!TO AND OWNERSHIP OF THE SOFTWARE IS HEREBY TRANSFERRED.
!
!THE INFORMATION IN THIS SOFTWARE IS SUBJECT TO CHANGE WITHOUT NOTICE AND 
!SHOULD NOT BE CONSTRUED AS A COMMITMENT BY DIGITAL EQUIPMENT CORPORATION.
!
!DIGITAL ASSUMES NO RESPONSIBILITY FOR THE USE OR RELIABILITY OF ITS 
!SOFTWARE ON EQUIPMENT THAT IS NOT SUPPLIED BY DIGITAL.
!
!
!++
! FACILITY:	EDT -- The DEC Standard Editor
!
! ABSTRACT:
!
!	Resequence a range of lines.
!
! ENVIRONMENT:	Runs at any access mode - AST reentrant
!
! AUTHOR: Bob Kushlis, CREATION DATE: October 16, 1978
!
! MODIFIED BY:
!
! 1-001	- Original.  DJS 23-Feb-1981.  This module was created by
!	extracting routine EDT$$RSEQ  from module EDTWF.
! 1-002	- Regularize headers.  JBS 19-Mar-1981
! 1-003 - Add return value and line_too_large error check.  SMB 4-Feb-1982
! 1-004 - Change count to 48-bits.  SMB 07-Feb-1982
! 1-005 - Only copy cur_buf once. STS 18-Mar-1982
! 1-006	- Fix subtitle and local symbol name.  JBS 14-Sep-1982
! 1-007 - Put edt$$tst_eob in line. STS 22-Sep-1982
! 1-008	- Declare EDT$$Z_EOB_LN.  JBS 23-Sep-1982
! 1-009	- Remove declaration of EDT$$TST_EOB, no longer used.  JBS 24-Sep-1982
! 3-001 - Add updates from V3 sources.  GB 09-may-1983
!--

%SBTTL 'Declarations'
!
! TABLE OF CONTENTS:
!

REQUIRE 'EDTSRC:TRAROUNAM';

FORWARD ROUTINE
    EDT$$RSEQ;

!
! INCLUDE FILES:
!

REQUIRE 'EDTSRC:EDTREQ';

!
! MACROS:
!
!	NONE
!
! EQUATED SYMBOLS:
!
!	NONE
!
! OWN STORAGE:
!
!	NONE
!
! EXTERNAL REFERENCES:
!
!	In the routine
%SBTTL 'EDT$WF_RESEQUENCE - resequence a range of lines'

GLOBAL ROUTINE EDT$$RSEQ (			! Resequence a range of lines
	COUNT, 					! Number of lines
	START, 					! Initial line number
	INC					! Increment
    ) =

!++
! FUNCTIONAL DESCRIPTION:
!
!	This routine resequences a range of lines.  The current line is
!	the first to be resequenced.  The line following the last line
!	resequenced becomes the current line.  This routine works by assigning
!	the number START to the first line and adding INC to get the next line
!	number.  If when we have finished, the number of the following line is
!	less than the last one resequenced, then we continue resequencing until
!	this is no longer true.
!
! FORMAL PARAMETERS:
!
!  COUNT 		the number of lines to be resequenced
!
!  START 		the initial line number
!
!  INC 			the line number increment.
!
! IMPLICIT INPUTS:
!
!	CUR_BUF
!	WK_LN
!
! IMPLICIT OUTPUTS:
!
!	CUR_BUF
!	WK_MODFD
!
! ROUTINE VALUE:
!
!	0 = unable to resequence some of the lines
!	1 = successful resequence
!
! SIDE EFFECTS:
!
!	NONE
!
!--

    BEGIN

    EXTERNAL ROUTINE
	EDT$$FMT_MSG,
	EDT$$CMP_LNO,
	EDT$$RD_CURLN : NOVALUE,
	EDT$$RD_NXTLN;

    EXTERNAL
	WK_RESCNT : LN_BLOCK,		! Actual # lines resequenced
	LNO0 : LN_BLOCK,
	LNO_ZERO : LN_BLOCK,
	LNO_BIG,				! Maximum line number
	CUR_BUF : REF TBCB_BLOCK,	! Current text buffer control block
	WK_LN : REF LIN_BLOCK,		! Pointer to current line
	EOB_LN : REF LIN_BLOCK,		! Location of special end-of-buffer line
	WK_MODFD;			! Flag indicating bucket was modified

    MESSAGES ((MAXLINNUM));

    LOCAL
	COPY_FLAG,
	EOF,
	MAX,
	LINE_TOO_LARGE,				! 1 or more lines will have max line number
	EDT$$SAV_BUFPOS : POS_BLOCK,
	LINE_CNT : LN_BLOCK,			! Temporary holds res count
	NEXT_LINE_NUMBER : LN_BLOCK,
	PREV_NUM : LN_BLOCK;

    MOVELINE (.COUNT, LINE_CNT);
    MOVELINE (.COUNT, WK_RESCNT);
    COPY_FLAG = 0;

    IF (EDT$$CMP_LNO(LINE_CNT, LNO_ZERO) EQL 0) THEN RETURN (0);
    EOF = 0;

    MOVELINE (.START, NEXT_LINE_NUMBER);
    MOVELINE (.START, PREV_NUM);
    LINE_TOO_LARGE = 0;

    WHILE ( NOT .EOF) DO
	BEGIN

!+
! Determine if there are more lines to resequence than what was specified
! in COUNT.  If so, increase the "actual resequence count".
!-
	IF (EDT$$CMP_LNO(LINE_CNT, LNO_ZERO) EQL 0)
	THEN
	    IF (EDT$$CMP_LNO (WK_LN [LIN_NUM], PREV_NUM) GTR 0) 
	    THEN 
		EXITLOOP
	    ELSE
		ADDLINE (WK_RESCNT, LNO0, WK_RESCNT)
	ELSE
	    SUBLINE (LNO0, LINE_CNT, LINE_CNT);

	MOVELINE (NEXT_LINE_NUMBER, WK_LN [LIN_NUM]);
	WK_MODFD = 1;
	EDT$$RD_NXTLN ();

	IF (EDT$$CMP_LNO(LINE_CNT, LNO_ZERO) EQL 0) 
	THEN 
	    IF NOT .COPY_FLAG THEN
	    BEGIN
	    EDT$$CPY_MEM (POS_SIZE, .CUR_BUF, EDT$$SAV_BUFPOS);
	    COPY_FLAG = 1;
	    END;

	MOVELINE (NEXT_LINE_NUMBER, PREV_NUM);
	IF (.WK_LN NEQA EOB_LN)
	THEN
	    BEGIN
	    MAX = ADDLINE (.INC, NEXT_LINE_NUMBER, NEXT_LINE_NUMBER);
	    IF ((EDT$$CMP_LNO(NEXT_LINE_NUMBER, LNO_BIG) GTR 0)
	     OR (.MAX NEQ 0))
	    THEN
	    	BEGIN
	    	LINE_TOO_LARGE = 1;
	    	MOVELINE (LNO_BIG, NEXT_LINE_NUMBER)
	    	END;
	    END
	 ELSE
	    EOF = 1;
	END;

    EDT$$CPY_MEM (POS_SIZE, EDT$$SAV_BUFPOS, .CUR_BUF);
    EDT$$RD_CURLN ();
    IF (.LINE_TOO_LARGE NEQ 0)
    THEN
	BEGIN
	EDT$$FMT_MSG (EDT$_MAXLINNUM);
	RETURN (0)
	END
    ELSE
	RETURN (1)
    END;


END
ELUDOM