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

 %TITLE 'WFCLEAR - empty the current buffer'
MODULE WFCLEAR (				! Empty the current buffer
		IDENT = '1-002'			! File: WFCLEAR.BLI Edit: JBS1002
		) =
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:
!
!	Empty the current buffer.
!
! ENVIRONMENT:	Runs at any access mode - AST reentrant
!
! AUTHOR: Bob Kushlis, CREATION DATE: October 16, 1978
!
! MODIFIED BY:
!
! 1-001	- Original.  DJS 23-Feb-1981.  This module was created by
!	extracting routine EDT$$WF_CLRBUF  from module EDTWF.
! 1-002	- Regularize headers.  JBS 16-Mar-1981
!--

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

REQUIRE 'EDTSRC:TRAROUNAM';

FORWARD ROUTINE
    EDT$$WF_CLRBUF : NOVALUE;

!
! INCLUDE FILES:
!

REQUIRE 'EDTSRC:EDTREQ';

!
! MACROS:
!
!	NONE
!
! EQUATED SYMBOLS:
!
!	NONE
!
! OWN STORAGE:
!
!	NONE
!
! EXTERNAL REFERENCES:
!
!	In the routine
%SBTTL 'EDT$$WF_CLRBUF  - empty the current buffer'

GLOBAL ROUTINE EDT$$WF_CLRBUF 			! Empty the current buffer
    : NOVALUE =

!++
! FUNCTIONAL DESCRIPTION:
!
!	Clear the entire current buffer.  The first bucket of the buffer is
!	updated to be empty, and, if there is more than one, the rest of the
!	bucket is placed on the available bucket list.  Note that since the
!	buckets are already linked together, we need only link the last bucket
!	in the buffer to the current available bucket, then make avail the
!	first bucket we are releasing.
!
! FORMAL PARAMETERS:
!
!	NONE
!
! IMPLICIT INPUTS:
!
!	CUR_BUF
!	WK_AVAIL
!	WK_BUK
!	WK_CURBUK
!	LNO_ZERO
!
! IMPLICIT OUTPUTS:
!
!	WK_AVAIL
!	WK_BUK
!	CUR_BUF
!	WK_MODFD
!
! ROUTINE VALUE:
!
!	NONE
!
! SIDE EFFECTS:
!
!	NONE
!
!--

    BEGIN

    EXTERNAL ROUTINE
	EDT$$WF_BOT : NOVALUE,
	EDT$$TOP_BUF : NOVALUE;

    EXTERNAL
	CUR_BUF : REF TBCB_BLOCK,	! Current text buffer control block
	WK_AVAIL,			! Pointer to next available deleted bucket
	WK_BUK : 			! Pointer to current bucket
	    REF BLOCK [WF_BUKT_SIZE] FIELD (WFB_FIELDS),
	WK_CURBUK,			! Number of the current bucket
	WK_MODFD,			! Flag indicating bucket was modified
	LNO_ZERO : LN_BLOCK;

    EDT$$TOP_BUF ();
!+
! Release remaining buckets if there are more than one.
!-

    IF (.WK_BUK [WFB_NEXT_BUKT] NEQ 0)
    THEN
	BEGIN
	EDT$$WF_BOT ();
	WK_BUK [WFB_NEXT_BUKT] = .WK_AVAIL;
	WK_MODFD = 1;
	EDT$$TOP_BUF ();
	WK_AVAIL = .WK_BUK [WFB_NEXT_BUKT];
	END;

    CUR_BUF [TBCB_LINE_ADDR] = WFB_FIXED_SIZE;
    WK_BUK [WFB_END] = WFB_FIXED_SIZE;
    WK_BUK [WFB_NEXT_BUKT] = 0;
    WK_MODFD = 1;
    MOVELINE (LNO_ZERO, CUR_BUF [TBCB_LINE_COUNT]);
    CUR_BUF [TBCB_CHAR_COUNT] = 0;
    CUR_BUF [TBCB_LAST_BUKT] = .WK_CURBUK;
    END;


END
ELUDOM