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 %TITLE 'WFAPPBKT - append a new bucket'
MODULE WFAPPBKT (				! Append a new bucket to a text buffer
		IDENT = '3-003'			! File: WFAPPBKT.BLI Edit: CJG3003
		) =
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:
!
!	Append a new bucket to a text buffer.
!
! 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 APPEND_BUKT from module EDTWF.
! 1-002	- Regularize headers.  JBS 16-Mar-1981
! 1-003 - Modify to use edt$workio. STS 15-Feb-1982
! 1-004 - Add literals for callable parameters. STS 08-Mar-1982
! 1-005 - Put wf_nxt_buk in line. STS 11-Oct-1982
! 3-001 - Make WK_LN an address not a string ptr.  GB 18-Feb-1983
! 3-002 - Add updates from V3 sources.  GB 16-May-1983
! 3-003 - Remove call to EDT$$CALLWIO. CJG 13-Jun-1983
!--

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

REQUIRE 'EDTSRC:TRAROUNAM';

FORWARD ROUTINE
    EDT$$WF_NEWBUK : NOVALUE;

!
! INCLUDE FILES:
!

REQUIRE 'EDTSRC:EDTREQ';

!
! MACROS:
!
!	NONE
!
! EQUATED SYMBOLS:
!
!	NONE
!
! OWN STORAGE:
!
!	NONE
!
! EXTERNAL REFERENCES:
!
!	In the routine
%SBTTL 'EDT$$WF_NEWBUK  - append a new bucket'

GLOBAL ROUTINE EDT$$WF_NEWBUK (			! Append a new bucket to a text buffer
	NEXT, 					! Next bucket, or 0
	PREV					! Previous bucket, or 0
    ) : NOVALUE =

!++
! FUNCTIONAL DESCRIPTION:
!
!	This routine appends a new bucket to a text buffer.  The bucket is
!	linked into the chain.
!
! FORMAL PARAMETERS:
!
!  NEXT 		the bucket which will follow the new bucket or 0 if it is at the end.
!
!  PREV 		the bucket which will precede the new bucket or 0 if it is the first.
!
! IMPLICIT INPUTS:
!
!	CUR_BUF
!	WK_BUK
!	WK_CURBUK
!	WK_LN
!	WF_DESC
!	WK_MODFD
!
! IMPLICIT OUTPUTS:
!
!	CUR_BUF
!	WK_MODFD
!	WK_CURBUK
!
! ROUTINE VALUE:
!
!	NONE
!
! SIDE EFFECTS:
!
!	NONE
!
!--

    BEGIN

    EXTERNAL ROUTINE
	EDT$$WF_WR : NOVALUE,
	EDT$$WF_ALOBUF : NOVALUE,
	EDT$$WF_MAKECUR : NOVALUE;

    EXTERNAL
	WF_DESC : BLOCK[8],		! workfile record descriptor
	CUR_BUF : REF TBCB_BLOCK,	! Current text buffer control block
 	WK_AVAIL,
    	WK_GRTSTBUK,
	WK_BUK : 			! Pointer to current bucket
	    REF BLOCK [WF_BUKT_SIZE] FIELD (WFB_FIELDS),
	WK_CURBUK,			! Number of the current bucket
	WK_LN : REF LIN_BLOCK,		! Pointer to current line
	WK_MODFD;			! Flag indicating bucket was modified

!+
! Is this the last bucket in the buffer?
!-

    IF (.NEXT EQL 0)
    THEN
!+
! Yes, update the last bucket field of CUR_BUF
!-
    	IF (.WK_AVAIL NEQ 0)
    	THEN
    	    CUR_BUF[TBCB_LAST_BUKT] = .WK_AVAIL
    	ELSE
    	    CUR_BUF[TBCB_LAST_BUKT] = .WK_GRTSTBUK
    ELSE
!+
! No, link the next bucket back to the one we are adding.
!-
	BEGIN
	EDT$$WF_MAKECUR (.NEXT);
    	IF (.WK_AVAIL NEQ 0)
    	THEN
    	    WK_BUK[WFB_PREV_BUKT] = .WK_AVAIL
    	ELSE
    	    WK_BUK[WFB_PREV_BUKT] = .WK_GRTSTBUK;

	WK_MODFD = 1;
	END;

!+
! Write out the current bucket if it has been modified.
!-

    IF .WK_MODFD THEN EDT$$WF_WR (.WK_CURBUK, WF_DESC);

    WK_MODFD = 0;
!+
! Get a new bukt.
!-
    EDT$$WF_ALOBUF ();
!+
! Update the current bucket and next bucket info
!-
    CUR_BUF [TBCB_CUR_BUKT] = .WK_CURBUK;
!+
! Fill in the bucket info for the new bucket
!-
    WK_BUK [WFB_NEXT_BUKT] = .NEXT;
    WK_BUK [WFB_PREV_BUKT] = .PREV;
    WK_BUK [WFB_END] = WFB_FIXED_SIZE;
!+
! Update CUR_BUF  to point to first record in this new bucket
!-
    CUR_BUF [TBCB_LINE_ADDR] = WFB_FIXED_SIZE;
    WK_LN = .WK_BUK + WFB_FIXED_SIZE;
!+
! Mark the new bucket as modified.
!-
    WK_MODFD = 1;
    END;


END
ELUDOM