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 %TITLE 'CLRKEY - cancel a key definition'
MODULE CLRKEY (				! Cancel a key definition
		IDENT = '3-001'			! File: CLRKEY.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:
!
!	Cancel a key definition
!
! ENVIRONMENT:	Runs at any access mode - AST reentrant
!
! AUTHOR: Bob Kushlis, CREATION DATE: 6-AUG-1979
!
! MODIFIED BY:
!
! 1-001	- Original.  DJS 18-FEB-1981.  This module was created by
!	extracting routine EDT$$CAN_KDEF  from module EDTCTR.
! 1-002	- Regularize headers and fix file name.  JBS 04-Mar-1981
! 1-003 - Deallocate virtual memory for keys before cancelled. TMV 06-Aug-81
! 1-004	- Return a status code.  JBS 18-May-1982
! 1-005	- New implementation of defined keys.  JBS 13-Aug-1982
! 3-001 - Add updates from V3 source kit.  GB 27-Apr 1983
!--

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

REQUIRE 'EDTSRC:TRAROUNAM';

FORWARD ROUTINE
    EDT$$CAN_KDEF;

!
! INCLUDE FILES:
!

REQUIRE 'EDTSRC:EDTREQ';

LIBRARY 'EDTSRC:KEYPADDEF';

!
! MACROS:
!
!	NONE
!
! EQUATED SYMBOLS:
!
!	NONE
!
! OWN STORAGE:
!
!	NONE
!
! EXTERNAL REFERENCES:
!
!	In the routine
%SBTTL 'EDT$$CAN_KDEF  - cancel a key definition'

GLOBAL ROUTINE EDT$$CAN_KDEF (			! Cancel a key definition
    KEY						! Number of the key whose definition to cancel
    ) =

!++
! FUNCTIONAL DESCRIPTION:
!
!	Cancel a key definition,and deallocate virtual memory
!
! FORMAL PARAMETERS:
!
!  KEY			The number of the key whose definition to cancel
!
! IMPLICIT INPUTS:
!
!	NONE
!
! IMPLICIT OUTPUTS:
!
!	TRN_TBL
!
! ROUTINE VALUE:
!
!	EDT$_KEYNOTDEF if the key cannot be defined, 1 if it can.
!
! SIDE EFFECTS:
!
!	NONE
!
!--

    BEGIN

    EXTERNAL ROUTINE
	EDT$$DEA_HEAP,
	EDT$$TST_BADK;

    EXTERNAL
	TRN_TBL : VECTOR;		! The keypad translation table

    MESSAGES ((KEYNOTDEF));

    LOCAL
	KEY_PTR : REF BLOCK [ ] FIELD (KEY_DEF_FIELD),
	OLD_KEY_PTR : REF BLOCK [ ] FIELD (KEY_DEF_FIELD);

    IF EDT$$TST_BADK (.KEY) THEN RETURN (EDT$_KEYNOTDEF);

!+
! If the key was defined then deallocate memory before cancelling.
!-
    OLD_KEY_PTR = TRN_TBL [.KEY MOD K_KPAD_HASHSIZ];
    KEY_PTR = .OLD_KEY_PTR [KEY_DEF_NEXT];

    IF (.KEY_PTR EQLA 0) THEN RETURN (1);

    WHILE (.KEY_PTR [KEY_DEF_KEY] NEQ .KEY) DO
	BEGIN
	OLD_KEY_PTR = .KEY_PTR;
	KEY_PTR = .KEY_PTR [KEY_DEF_NEXT];

	IF (.KEY_PTR EQLA 0) THEN RETURN (1);

	END;

    OLD_KEY_PTR [KEY_DEF_NEXT] = .KEY_PTR [KEY_DEF_NEXT];
    EDT$$DEA_HEAP (%REF (.KEY_PTR [KEY_DEF_LEN] + KEY_DEF_OVERHEAD), %REF (.KEY_PTR));
    RETURN (1);
    END;					! of routine EDT$$CAN_KDEF

!<BLF/PAGE>

END						! of module EDT$CLRKEY

ELUDOM