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 %TITLE 'WFSTRINS - start an INSERT operation'
MODULE WFSTRINS (				! Start an INSERT operation
		IDENT = '1-002'			! File: WFSTRINS.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:
!
!	Start an INSERT operation.
!
! 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$$START_INS  from module EDTWF.
! 1-002	- Regularize headers.  JBS 19-Mar-1981
!--

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

REQUIRE 'EDTSRC:TRAROUNAM';

FORWARD ROUTINE
    EDT$$START_INS : NOVALUE;

!
! INCLUDE FILES:
!

REQUIRE 'EDTSRC:EDTREQ';

!
! MACROS:
!
!	NONE
!
! EQUATED SYMBOLS:
!
!	NONE
!
! OWN STORAGE:
!
!	NONE
!
! EXTERNAL REFERENCES:
!
!	In the routine
%SBTTL 'EDT$$START_INS  - start an INSERT operation'

GLOBAL ROUTINE EDT$$START_INS 			! Start an INSERT operation
    : NOVALUE =

!++
! FUNCTIONAL DESCRIPTION:
!
!	This routine is called to start the insertion of text. The new lines
!	will be inserted immediately before the current line.  The insert
!	count (WK_INSCNT ) is set to zero, and the numbers of the current and
!	preceding lines are saved.
!
! FORMAL PARAMETERS:
!
!	NONE
!
! IMPLICIT INPUTS:
!
!	WK_LN
!	WK_NXTLNO
!	WK_STARTNO
!	LNO_ZERO
!
! IMPLICIT OUTPUTS:
!
!	WK_INSCNT
!
! ROUTINE VALUE:
!
!	NONE
!
! SIDE EFFECTS:
!
!	NONE
!
!--

    BEGIN

    EXTERNAL ROUTINE
	EDT$$RD_PRVLN,
	EDT$$RD_NXTLN;

    EXTERNAL
	WK_INSCNT : LN_BLOCK,		! The count of inserted lines
	WK_LN : REF LIN_BLOCK,		! Pointer to current line
	WK_NXTLNO : LN_BLOCK,		! Line number following an insert
	WK_STARTNO : LN_BLOCK,		! Line number of line preceding an insert
	LNO_ZERO : LN_BLOCK;

!+
! Zero out the insert line counter
!-
    MOVELINE (LNO_ZERO, WK_INSCNT);
!+
! Save the current line number, bucket number, and line address
!-
    MOVELINE (WK_LN [LIN_NUM], WK_NXTLNO);
!+
! Find the prevsious line number
!-

    IF EDT$$RD_PRVLN ()
    THEN
	BEGIN
	MOVELINE (WK_LN [LIN_NUM], WK_STARTNO);
	EDT$$RD_NXTLN ()
	END
    ELSE
!+
! Make the previous line number 0 if the insert is at the beginning of the buffer
!-
	MOVELINE (LNO_ZERO, WK_STARTNO)

    END;


END
ELUDOM