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 %TITLE 'WFRBUKT - make a bucket current'
MODULE WFRBUKT (				! make a bucket the current bucket
		IDENT = '3-001'			! File: WFRBUKT.BLI Edit: CJG3001
		) =
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:
!
!	Make a specified bucket the current bucket.
!
! 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 READ_BUKT from module EDTWF.
! 1-002	- regularize headers.  JBS 19-Mar-1981
! 1-003 - Modify to use EDT$WORKIO. STS 15-Feb-1982
! 1-004 - Add literals for callable parameters. STS 08-Mar-1982
! 3-001 - Remove call to EDT$$CALLWIO. CJG 13-Jun-1983
!--

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

REQUIRE 'EDTSRC:TRAROUNAM';

FORWARD ROUTINE
    EDT$$WF_MAKECUR : NOVALUE;

!
! INCLUDE FILES:
!

REQUIRE 'EDTSRC:EDTREQ';

!
! MACROS:
!
!	NONE
!
! EQUATED SYMBOLS:
!
!	NONE
!
! OWN STORAGE:
!
!	NONE
!
! EXTERNAL REFERENCES:
!
!	In the routine
%SBTTL 'EDT$$WF_MAKECUR  - make a bucket current'

GLOBAL ROUTINE EDT$$WF_MAKECUR (		! Make a specified bucket the current bucket
	BUKT_NUM				! Number of the bucket to make current
    ) : NOVALUE =

!++
! FUNCTIONAL DESCRIPTION:
!
!	This routine insures that the bucket number passed as a parameter is the
!	current bucket.  If it is not already the current bucket then return the
!	current bucket to the cache (marking it as modified if necessary) and
!	make the new bucket current by bringing it into the cache if necessary.
!
! FORMAL PARAMETERS:
!
!  BUKT_NUM 		the number of the bucket to read.
!
! IMPLICIT INPUTS:
!
!	WF_DESC
!	WK_BUK
!	WK_CURBUK
!	WK_MODFD
!
! IMPLICIT OUTPUTS:
!
!	WF_DESC
!	WK_BUK
!	WK_CURBUK
!	WK_MODFD
!
! ROUTINE VALUE:
!
!	NONE
!
! SIDE EFFECTS:
!
!	May write and read the work file, especially if the cache is small.
!
!--

    BEGIN

    EXTERNAL ROUTINE
	EDT$$WF_RD : NOVALUE,		! Read from work file
	EDT$$WF_WR : NOVALUE;		! Write to work file

    EXTERNAL
	WF_DESC : BLOCK,		! descriptor for workfile record
	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

!+
! Do not read if we are reading the current bucket
!-

    IF (.WK_CURBUK NEQ .BUKT_NUM)
    THEN
	BEGIN
!+
! Mark the current bucket as modified, if it has been.
!-

	IF .WK_MODFD THEN EDT$$WF_WR (.WK_CURBUK, WF_DESC);

!+
! Read the new bucket, possibly from the cache.
!-
	WK_CURBUK = .BUKT_NUM;
	EDT$$WF_RD (.WK_CURBUK, WF_DESC);
	WK_BUK = .WF_DESC[DSC$A_POINTER];	! get address of record
!+
! The new bucket has not yet been modified.
!-
	WK_MODFD = 0;
	END;

    END;


END
ELUDOM