Enter your search terms Submit search form
	Web pdp-10.trailing-edge.com

 %TITLE 'CHMEMESS - Erase the message line'
MODULE CHMEMESS (				! Erase the message line
		IDENT = '3-001'			! File: CHMEMESS.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:
!
!	This module erases the message line.
!
! ENVIRONMENT:	Runs at any access mode - AST reentrant
!
! AUTHOR: Bob Kushlis, CREATION DATE: Unknown
!
! MODIFIED BY:
!
! 1-001	- Original.  DJS 04-Feb-1981.  This module was created by
!	extracting the routine EDT$$ERA_MSGLN  from module CHANGE.BLI.
! 1-002	- Regularize headers.  JBS 27-Feb-1981
! 1-003	- Fix module name.  JBS 02-Mar-1981
! 1-004 - Erase both message lines.  SMB 21-Jun-1982
! 1-005	- Reset LASTMSG.  JBS 05-Jul-1982
! 1-006 - Erase to end of screen instead of two lines separately.  SMB 31-Aug-1982
! 1-007 - Move clearing of message flag.  SMB 06-Oct-1982
! 1-008	- Restore the cursor after clearing the message line.  JBS 09-Oct-1982
! 1-009	- Change the call to erase screen.  JBS 23-Oct-1982
! 1-010	- Don't restore the cursor if it has no current location.  JBS 17-Jan-1983
!
! 3-001 - Add updates from V3 source kit.  GB 27-Apr-1983
!--

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

REQUIRE 'EDTSRC:TRAROUNAM';

FORWARD ROUTINE
    EDT$$ERA_MSGLN : NOVALUE;			! Erase the message line

!
! INCLUDE FILES:
!

REQUIRE 'EDTSRC:EDTREQ';

!
! MACROS:
!
!	NONE
!
! EQUATED SYMBOLS:
!
!	NONE
!
! OWN STORAGE:
!
!	NONE
!
! EXTERNAL REFERENCES:
!
!	In the routine
%SBTTL 'EDT$$ERA_MSGLN  - erase the message line'

GLOBAL ROUTINE EDT$$ERA_MSGLN 			! Erase the message line
    : NOVALUE =

!++
! FUNCTIONAL DESCRIPTION:
!
!	This routine erases the message line if there is currently a message
!	on it.
!
! FORMAL PARAMETERS:
!
!	NONE
!
! IMPLICIT INPUTS:
!
!	MSGFLG
!	TIN_ECHOFLG,
!	TIN_ECHOPOS,
!	MESSAGE_LINE,
!
! IMPLICIT OUTPUTS:
!
!	MSGFLG
!	TIN_ECHOFLG,
!	TIN_ECHOPOS,
!	LASTMSG
!
! ROUTINE VALUE:
!
!	NONE
!
! SIDE EFFECTS:
!
!	May erase the message line
!
!--

    BEGIN

    EXTERNAL ROUTINE
	EDT$$SC_POSCSIF,			! Put cursor position in format buffer
	EDT$$SC_ERAALL;				! Erase to end of screen

    EXTERNAL
	TIN_ECHOFLG,
	TIN_ECHOPOS,
	MESSAGE_LINE,				! The line number for messages
	MSGFLG,					! Indicates a message has been displayed
	LASTMSG,				! The last message displayed (1 = none)
	CUR_COL,				! Current column
	CS_LNO;				! Current line

    LOCAL
	OLD_CS_LNO;

!+
! Check for message.
!-

    IF (.MSGFLG NEQ 0) OR (.TIN_ECHOFLG)
    THEN
	BEGIN

!+
! Reset the message and echo flags.
!-
	MSGFLG = 0;
	TIN_ECHOPOS = 0;
	TIN_ECHOFLG = 0;
	LASTMSG = 1;
!+
! Erase the message lines.
!-
	OLD_CS_LNO = .CS_LNO;
	CS_LNO = .MESSAGE_LINE;
	EDT$$SC_ERAALL ();
	CS_LNO = .OLD_CS_LNO;
!+
! Restore the cursor.
!-

	IF (.CS_LNO GEQ 0) THEN EDT$$SC_POSCSIF (.CS_LNO, .CUR_COL);

	END;

    END;					! of routine EDT$$ERA_MSGLN

END
ELUDOM