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 %TITLE 'MCDOWN - move cursor down'
MODULE MCDOWN (				! Move cursor down
		IDENT = '3-001'			! File: MCDOWN.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:
!
!	Move cursor down to next line
!
! ENVIRONMENT:	Runs at any access mode - AST reentrant
!
! AUTHOR: Bob Kushlis, CREATION DATE: September 9, 1979
!
! MODIFIED BY:
!
! 1-001	- Original.  DJS 19-FEB-1981.  This module was created by
!	extracting routine EDT$$CS_DWN  from module MOVCUR.
! 1-002	- Regularize headers.  JBS 11-Mar-1981
! 1-003 - Put edt$$tst_eob in line. STS 22-Sep-1982
! 1-004	- Remove EDT$$G_LN_NO for new screen update logic.  JBS 29-Sep-1982
! 3-001 - Add updates from V3 sources.  GB 03-May-1983
!--

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

REQUIRE 'EDTSRC:TRAROUNAM';

FORWARD ROUTINE
    EDT$$CS_DWN;

!
! INCLUDE FILES:
!

REQUIRE 'EDTSRC:EDTREQ';

!
! MACROS:
!
!	NONE
!
! EQUATED SYMBOLS:
!
!	NONE
!
! OWN STORAGE:
!
!	NONE
!
! EXTERNAL REFERENCES:
!
!	In the routine
%SBTTL 'EDT$$CS_DWN  - move cursor down'

GLOBAL ROUTINE EDT$$CS_DWN 			! Move cursor down
    =

!++
! FUNCTIONAL DESCRIPTION:
!
!	This routine moves to the first character of the following line.  If the
!	current line is EOB then it fails.
!
! FORMAL PARAMETERS:
!
!	NONE
!
! IMPLICIT INPUTS:
!
!	NONE
!
! IMPLICIT OUTPUTS:
!
!	NONE
!
! ROUTINE VALUE:
!
!	1 = move successful
!	0 = no next line
!
! SIDE EFFECTS:
!
!	If the current line has changed it is replaced in the work file.
!
!--

    BEGIN

    EXTERNAL ROUTINE
	EDT$$RPL_CHGDLN : NOVALUE,
	EDT$$GET_TXTLN : NOVALUE,
	EDT$$RD_NXTLN;

    EXTERNAL
	WK_LN : REF LIN_BLOCK,
	EOB_LN;

!+
! Replace the current line in the work file if it has changed.
!-
    EDT$$RPL_CHGDLN ();
!+
! If on EOB, then return failure.
!-

    IF (.WK_LN EQLA EOB_LN) THEN RETURN (0);

!+
! Move to the next line, fetch the line into the buffer and return success.
!-
    EDT$$RD_NXTLN ();
    EDT$$GET_TXTLN ();
    RETURN (1);
    END;


END
ELUDOM