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 %TITLE 'TIDELETE - handle DEL key'
MODULE TIDELETE (				! Handle DEL key
		IDENT = '1-003'			! File: TIDELETE.BLI Edit: JBS1003
		) =
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:
!
!	Handle the DEL key.
!
! ENVIRONMENT:	Runs at any access mode - AST reentrant
!
! AUTHOR: Bob Kushlis, CREATION DATE: June 9, 1979
!
! MODIFIED BY:
!
! 1-001	- Original.  DJS 18-FEB-1981.  This module was created by
!	extracting routine EDT$$TI_DELK  from module TINPUT.
! 1-002	- Regularize headers.  JBS 11-Mar-1981
! 1-003	- Correct handling of deleting of control characters.  JBS 27-May-1982
!--

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

REQUIRE 'EDTSRC:TRAROUNAM';

FORWARD ROUTINE
    EDT$$TI_DELK : NOVALUE;

!
! INCLUDE FILES:
!

REQUIRE 'EDTSRC:EDTREQ';

!
! MACROS:
!
!	NONE
!
! EQUATED SYMBOLS:
!

BIND
    DEL_ONE_CHAR = UPLIT (%STRING (%CHAR (ASC_K_BS), ' ', %CHAR (ASC_K_BS)));

LITERAL
    DEL_ONE_CHAR_LEN = 3;

!
! OWN STORAGE:
!
!	NONE
!
! EXTERNAL REFERENCES:
!
!	In the routine
%SBTTL 'EDT$$TI_DELK  - handle DEL key'

GLOBAL ROUTINE EDT$$TI_DELK (			! Handle DEL key
    C						! Character being deleted
    ) : NOVALUE =

!++
! FUNCTIONAL DESCRIPTION:
!
!	Delete the last character on the echo line.  This is done by writing
!	out backspace space backspace.  If the character was a control chraracter,
!	we do it twice.
!
! FORMAL PARAMETERS:
!
!  C 			The character which is being deleted.
!
! IMPLICIT INPUTS:
!
!	TIN_ECHOPOS
!
! IMPLICIT OUTPUTS:
!
!	TIN_ECHOPOS
!
! ROUTINE VALUE:
!
!	NONE
!
! SIDE EFFECTS:
!
!	NONE
!
!--

    BEGIN

    EXTERNAL ROUTINE
	EDT$$OUT_FMTBUF,
	EDT$$FMT_LIT;

    EXTERNAL
	TIN_ECHOPOS;			! Position on the echo line

    IF (.C LSS %C' ')
    THEN
	BEGIN
	TIN_ECHOPOS = .TIN_ECHOPOS - 1;
	EDT$$FMT_LIT (CH$PTR (DEL_ONE_CHAR), DEL_ONE_CHAR_LEN);
	END;

    TIN_ECHOPOS = .TIN_ECHOPOS - 1;
    EDT$$FMT_LIT (CH$PTR (DEL_ONE_CHAR), DEL_ONE_CHAR_LEN);
    EDT$$OUT_FMTBUF ();
    END;					! of routine EDT$$TI_DELK


END
ELUDOM