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 %TITLE 'MCUP - move cursor up'
MODULE MCUP (				! Move cursor up
		IDENT = '3-001'			! File: MCUP.BLI Edit: GB3001
		) =
BEGIN
!
!			  COPYRIGHT (c) 1981, 1985 BY
!	      DIGITAL EQUIPMENT CORPORATION, MAYNARD, MASS.
!		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 WHICH IS NOT SUPPLIED BY DIGITAL.
!

!++
! FACILITY:	EDT -- The DEC Standard Editor
!
! ABSTRACT:
!
!	Move cursor up.
!
! 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$$CS_UP  from module MOVCUR.
! 1-002	- Regularize headers.  JBS 11-Mar-1981
! 1-003	- Remove EDT$$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_UP;

!
! INCLUDE FILES:
!

REQUIRE 'EDTSRC:EDTREQ';

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

GLOBAL ROUTINE EDT$$CS_UP 			! Move cursor up
    =

!++
! FUNCTIONAL DESCRIPTION:
!
!	This routine moves the cursor up to the first character of the preceding
!	line.  If the current line is the first line in the buffer, it fails.
!
! FORMAL PARAMETERS:
!
!	NONE
!
! IMPLICIT INPUTS:
!
!	NONE
!
! IMPLICIT OUTPUTS:
!
!	NONE
!
! ROUTINE VALUE:
!
!	1 = move successful
!	0 = move unsuccessful because we are on the top line
!
! SIDE EFFECTS:
!
!	NONE
!
!--

    BEGIN

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

!+
! Replace the current line in the work file if it has changed.
!-
    EDT$$RPL_CHGDLN ();
!+
! Attempt to go back one line.
!-

    IF EDT$$RD_PRVLN ()
    THEN
	BEGIN
!+
! It succeeded, get the new line and return success.
!-
	EDT$$GET_TXTLN ();
	RETURN (1);
	END
    ELSE
!+
! No line above, return failure.
!-
	RETURN (0);

    END;


END
ELUDOM