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 %TITLE 'WFREAFWD - read the next line'
MODULE WFREAFWD (				! Read the next line
		IDENT = '3-001'			! File: WFREAFWD.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:
!
!	Read the next line in the forward direction.
!
! 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$$RD_NXTLN  from module EDTWF.
! 1-002	- Regularized the headers.  JBS 25-Feb-1981
! 1-003	- Fix module name.  JBS 19-Mar-1981
! 1-004	- Change EOB_LINE to EOB_LN .  JBS 31-Mar-1981
! 1-005	- Correct a typo in a subtitle.  JBS 02-Jun-1981
! 1-006 - Change index for line numbers from 10 to 15.  SMB 18-Jan-1982
! 1-007	- Remove EDT$$SET_WKLN.  JBS 14-Sep-1982
! 3-001 - Use LIN_NEXT to get address of next line.  GB 17-Feb-1983
!--

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

REQUIRE 'EDTSRC:TRAROUNAM';

FORWARD ROUTINE
    EDT$$RD_NXTLN;

!
! INCLUDE FILES:
!

REQUIRE 'EDTSRC:EDTREQ';

!
! MACROS:
!
!	NONE
!
! EQUATED SYMBOLS:
!
!	NONE
!
! OWN STORAGE:
!
!	NONE
!
! EXTERNAL REFERENCES:
!
!	In the routine
%SBTTL 'EDT$$RD_NXTLN  - read the next line'

GLOBAL ROUTINE EDT$$RD_NXTLN 			! Read the next line
    =

!++
! FUNCTIONAL DESCRIPTION:
!
!	Read the next line in the forward direction.  The line following the
!	current line becomes the new line.  This routine may have the effect
!	of reading a line from the input file.  If we are already at the end
!	of the buffer, then return a 0 otherwise return a 1.
!
! FORMAL PARAMETERS:
!
!	NONE
!
! IMPLICIT INPUTS:
!
!	EXITD
!	WK_BUK
!	WK_CURBUK
!	WK_LN
!	EOB_LN
!	LNO0
!
! IMPLICIT OUTPUTS:
!
!	CUR_BUF
!	WK_LN
!
! ROUTINE VALUE:
!
!	1		Not at end of buffer
!	0		At end of buffer
!
! SIDE EFFECTS:
!
!	NONE
!
!--

    BEGIN

    EXTERNAL ROUTINE
	EDT$$WF_MAKECUR : NOVALUE,
	EDT$$RD_ILN;

    EXTERNAL
	CUR_BUF : REF TBCB_BLOCK,	! Current text buffer control block
	EXITD,				! Exit flag (on if we are exiting)
	WK_BUK : 			! Pointer to current bucket
	    REF BLOCK [WF_BUKT_SIZE] FIELD (WFB_FIELDS),
	WK_CURBUK,			! Number of the current bucket
	WK_LN : REF LIN_BLOCK,		! Pointer to current line
	EOB_LN,
	LNO0 : LNOVECTOR [14];

    CUR_BUF [TBCB_CHAR_POS] = 0;
!+
! Point to the next line in the bucket.
!-

    IF (.CUR_BUF [TBCB_LINE_ADDR] NEQA .WK_BUK [WFB_END])
    THEN
	BEGIN
	CUR_BUF [TBCB_LINE_ADDR] = .CUR_BUF [TBCB_LINE_ADDR] + .WK_LN [LIN_NEXT];
	WK_LN = .WK_BUK + .CUR_BUF [TBCB_LINE_ADDR];
	ADDLINE (LNO0, CUR_BUF [TBCB_CUR_LIN], CUR_BUF [TBCB_CUR_LIN]);
	END;

!+
! If this is out of the scope of the bucket, then we better read the
! next bucket.
!-

    IF (.CUR_BUF [TBCB_LINE_ADDR] GEQA .WK_BUK [WFB_END])
    THEN

	IF (.WK_BUK [WFB_NEXT_BUKT] EQL 0)
	THEN
	    BEGIN

	    IF (.EXITD NEQ 0)
	    THEN
		BEGIN
!+
! Return zero so we don't read any more.
!-
		WK_LN = EOB_LN;
		RETURN (0);
		END;

!+
! End of buffer, try reading the next record.
!-
	    RETURN (EDT$$RD_ILN ());
	    END
	ELSE
	    BEGIN
	    EDT$$WF_MAKECUR (.WK_BUK [WFB_NEXT_BUKT]);
	    CUR_BUF [TBCB_LINE_ADDR] = WFB_FIXED_SIZE;
	    CUR_BUF [TBCB_CUR_BUKT] = .WK_CURBUK;
	    END;

!+
! Update the current line pointer.
!-
    WK_LN = .WK_BUK + .CUR_BUF [TBCB_LINE_ADDR];
    RETURN (1)
    END;


END
ELUDOM