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 %TITLE 'SCRDELETE - delete lines from the screen'
MODULE SCRDELETE (				! Delete lines from the screen
		IDENT = '3-001'			! File: SCRDELETE.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:
!
!	This module updates the screen when a line terminator
!	has been deleted.
!
! ENVIRONMENT:	Runs at any access mode - AST reentrant
!
! AUTHOR: Bob Kushlis, CREATION DATE: September 8, 1979
!
! MODIFIED BY:
!
! 1-001	- Original.  DJS 12-Feb-1981.  This module was created by
!	extracting the routine EDT$$SC_DELLN  from module SCREEN.
! 1-002	- regularize headers.  JBS 13-Mar-1981
! 1-003	- Update LN_ONSCR  correctly.  JBS 10-Jul-1981
! 1-004	- Improve the comments.  JBS 24-Sep-1981
! 1-005 - Change boundary check to catch LN_NO = 0.  SMB 8-Mar-1982
! 1-006	- Check a new flag for availability of scrolling regions.  JBS 31-Aug-1982
! 1-007 - Modify to use new screen update logic.   SMB 21-Aug-1982
! 1-008 - Modify to use new 48 bit macros. STS 01-oct-1982
! 1-009 - Remove references to L_CUR_SCRLN.  SMB 04-Oct-1982
! 1-010	- Change EDT$$G_SCR_CHGD to EDT$$G_SCR_REBUILD.  JBS 09-Oct-1982
! 1-011 - Clean up the left over globals.  SMB 10-Oct-1982
! 1-012 - Update L_CUR_SCRLN and remove SCR_REBUILD.  SMB 13-Oct-1982
! 1-013	- Don't rebuild the screen after deleting a line.  JBS 23-Oct-1982
! 1-014	- Change the call to EDT$$MRK_LNCHG.  JBS 27-Dec-1982
!--

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

REQUIRE 'EDTSRC:TRAROUNAM';

FORWARD ROUTINE
    EDT$$SC_DELLN : NOVALUE;

!
! INCLUDE FILES:
!

REQUIRE 'EDTSRC:EDTREQ';

!
! MACROS:
!
!	NONE
!
! EQUATED SYMBOLS:
!
!	NONE
!
! OWN STORAGE:
!
!	NONE
!
! EXTERNAL REFERENCES:
!
!	In the routine
%SBTTL 'EDT$$SC_DELLN  - delete lines from the screen'

GLOBAL ROUTINE EDT$$SC_DELLN 			! Delete lines from the screen
    : NOVALUE =

!++
! FUNCTIONAL DESCRIPTION:
!
!	This routine is called when a line terminator has been deleted.
!	The screen record pointers are updated and the line is marked
!	for delete.
!
! FORMAL PARAMETERS:
!
!  LINES		The number of lines to delete
!
! IMPLICIT INPUTS:
!
!	CUR_BUF
!	SCR_BUF
!
! IMPLICIT OUTPUTS:
!
!	CUR_SCRLN
!
! ROUTINE VALUE:
!
!	NONE
!
! SIDE EFFECTS:
!
!	NONE
!
!--

    BEGIN

    EXTERNAL ROUTINE
	EDT$$CMP_LNO,
	EDT$$MRK_LNCHG : NOVALUE;		! Track line updates

    EXTERNAL
	LNO0,
	CUR_SCRLN : LN_BLOCK,		! Current screen record
	CUR_BUF : REF TBCB_BLOCK,	! The current buffer tbcb.
	SCR_BUF : REF TBCB_BLOCK;	! Current screen buffer

    IF (.SCR_BUF NEQA .CUR_BUF) THEN RETURN;

    EDT$$MRK_LNCHG (SCR_EDIT_DELLN, 0);

    IF (EDT$$CMP_LNO (CUR_BUF [TBCB_CUR_LIN], CUR_SCRLN) LSS 0)	!
    THEN
	SUBLINE (LNO0, CUR_SCRLN, CUR_SCRLN);

    END;					! of routine EDT$$SC_DELLN

!<BLF/PAGE>

END						! of module SCRDELETE

ELUDOM