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 %TITLE 'WFDELBKT - delete the current bucket'
MODULE WFDELBKT (				! Delete the current bucket
		IDENT = '3-001'			! File: WFDELBKT.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:
!
!	Delete a bucket.
!
! 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 DELETE_BUKT from module EDTWF.
! 1-002	- Regularize headers.  JBS 16-Mar-1981
! 1-003	- Remove EDT$$SET_WKLN.  JBS 14-Sep-1982
! 1-004 - Remove call to EDT$$WF_RELBUK. STS 11-Oct-1982
! 3-001 - Add updates from V3 sources.  GB 04-May-1983
!--

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

REQUIRE 'EDTSRC:TRAROUNAM';

FORWARD ROUTINE
    EDT$$WF_DELBUK : NOVALUE;

!
! INCLUDE FILES:
!

REQUIRE 'EDTSRC:EDTREQ';

!
! MACROS:
!
!	NONE
!
! EQUATED SYMBOLS:
!
!	NONE
!
! OWN STORAGE:
!
!	NONE
!
! EXTERNAL REFERENCES:
!
!	In the routine
%SBTTL 'EDT$$WF_DELBUK  - delete the current bucket'

GLOBAL ROUTINE EDT$$WF_DELBUK 			! Delete the current bucket
    : NOVALUE =

!++
! FUNCTIONAL DESCRIPTION:
!
!	This routine is called when all the text in a bucket has been deleted.
!	If this is not the only bucket in the text buffer, then update the links
!	of the previous and next bucket to point to each other, handling the
!	special case of the first and last bucket.
!
! FORMAL PARAMETERS:
!
!	NONE
!
! IMPLICIT INPUTS:
!
!	CUR_BUF
!	WK_BUK
!	WK_CURBUK
!
! IMPLICIT OUTPUTS:
!
!	WK_MODFD
!	CUR_BUF
!	WK_CURBUK
!	WK_LN
!
! ROUTINE VALUE:
!
!	NONE
!
! SIDE EFFECTS:
!
!	Changes the current bucket.
!
!--

    BEGIN

    EXTERNAL ROUTINE
	EDT$$WF_MAKECUR : NOVALUE,
	EDT$$RD_NXTLN;

    EXTERNAL
	CUR_BUF : REF TBCB_BLOCK,	! Current text buffer control block
	WK_BUK : 			! Pointer to current bucket
	    REF BLOCK [WF_BUKT_SIZE] FIELD (WFB_FIELDS),
	WK_CURBUK,			! Number of the current bucket
	WK_MODFD,			! Flag indicating bucket was modified
    	WK_AVAIL,
	WK_LN : REF LIN_BLOCK;		! Pointer to work line

    LOCAL
	NEXT,
	PREV;

!+
! Keep track of its previous and next bucket pointers.
!-
    NEXT = .WK_BUK [WFB_NEXT_BUKT];
    PREV = .WK_BUK [WFB_PREV_BUKT];
!+
! If this is the only bucket in the text buffer just update
! WK_LN  and get out.
!-

    IF ((.NEXT OR .PREV) EQL 0)
    THEN
	BEGIN
	EDT$$RD_NXTLN ();
	RETURN;
	END;

!+
! Release the bucket.
!-
    WK_BUK[WFB_NEXT_BUKT] = .WK_AVAIL;
    WK_AVAIL = .WK_CURBUK;
    WK_MODFD = 1;
!+
! Link the previous bucket to the next one.
!-

    IF (.PREV EQL 0)
    THEN
	CUR_BUF [TBCB_FIRST_BUKT] = .NEXT
    ELSE
	BEGIN
	EDT$$WF_MAKECUR (.PREV);
	WK_BUK [WFB_NEXT_BUKT] = .NEXT;
	WK_MODFD = 1;
	END;

!+
! If this was the last bucket then update CUR_BUF , otherwise
! go to the next bucket and update it's pointers.
!-

    IF (.NEXT EQL 0)
    THEN
	BEGIN
	CUR_BUF [TBCB_LAST_BUKT] = CUR_BUF [TBCB_CUR_BUKT] = .PREV;
	CUR_BUF [TBCB_LINE_ADDR] = .WK_BUK [WFB_END];
	EDT$$RD_NXTLN ();
	END
    ELSE
	BEGIN
	EDT$$WF_MAKECUR (.NEXT);
	WK_BUK [WFB_PREV_BUKT] = .PREV;
	CUR_BUF [TBCB_LINE_ADDR] = WFB_FIXED_SIZE;
	WK_LN = .WK_BUK + .CUR_BUF [TBCB_LINE_ADDR];
	WK_MODFD = 1;
	END;

!+
! Update the current bucket field.
!-
    CUR_BUF [TBCB_CUR_BUKT] = .WK_CURBUK;
    END;


END
ELUDOM