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 %TITLE 'SCRMCOL - match column'
MODULE SCRMCOL (				! Match column
		IDENT = '3-001'			! File: SCRMCOL.BLI Edit: GB3001
		) =
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:
!
!	This module fixes up the column after a vertical move.
!
! ENVIRONMENT:	Runs at any access mode - AST reentrant
!
! AUTHOR: Bob Kushlis, CREATION DATE: September 8, 1979
!
! MODIFIED BY:
!
! 1-001	- Original.  DJS 12-Feb-1981.  This module was created by
!	extracting the routine EDT$$SC_MATCHCOL  from module SCREEN.
! 1-002	- Regularize headers.  JBS 13-Mar-1981
! 1-003	- Don't use the screen data base, since the current line may not
!	   be on the screen.  JBS 10-Sep-1982
! 1-004 - Remove references to globals that aren't there.  SMB 22-Sep-1982
!--

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

REQUIRE 'EDTSRC:TRAROUNAM';

FORWARD ROUTINE
    EDT$$SC_MATCHCOL : NOVALUE;

!
! INCLUDE FILES:
!

REQUIRE 'EDTSRC:EDTREQ';

!
! MACROS:
!
!	NONE
!
! EQUATED SYMBOLS:
!
!	NONE
!
! OWN STORAGE:
!
!	NONE
!
! EXTERNAL REFERENCES:
!
!	In the routine

%SBTTL 'EDT$$SC_MATCHCOL  - match column'

GLOBAL ROUTINE EDT$$SC_MATCHCOL 		! Match column
    : NOVALUE =

!++
! FUNCTIONAL DESCRIPTION:
!
!	Match column.  This routine is called when a vertical arrow has been used to
!	move the cursor.  We have already moved to the new line, now we will try to
!	match the column we were previously in.  The column we are trying to hit is
!	COL .  We start at the beginning of the line and keep moving
!	forward by a character until the next character would cause the column to exceed
!	COL .
!
! FORMAL PARAMETERS:
!
!	NONE
!
! IMPLICIT INPUTS:
!
!	COL
!	LN_BUF
!	LN_END
!
! IMPLICIT OUTPUTS:
!
!	CUR_COL
!	LN_PTR
!	CS_LNO
!
! ROUTINE VALUE:
!
!	NONE
!
! SIDE EFFECTS:
!
!	NONE
!
!--

    BEGIN

    EXTERNAL ROUTINE
	EDT$$FMT_CHWID;				! Compute the width of a character

    EXTERNAL
	COL,				! The column we should be on.
	CUR_COL,				! current cursor column
	LN_BUF,				! Current line buffer.
	LN_PTR,				! Current character pointer.
	LN_END;				! End of current line pointer.

    LOCAL
	NEXT_COL;

    LN_PTR = CH$PTR (LN_BUF,, BYTE_SIZE);
    CUR_COL = 0;
    NEXT_COL = 0;

    WHILE CH$PTR_NEQ (.LN_END, .LN_PTR) DO
	BEGIN
	NEXT_COL = .NEXT_COL + EDT$$FMT_CHWID (CH$RCHAR (.LN_PTR), .NEXT_COL);

	IF (.NEXT_COL GTR .COL) THEN EXITLOOP;

	LN_PTR = CH$PLUS (.LN_PTR, 1);
	CUR_COL = .NEXT_COL;
	END;

    END;					! of routine EDT$$SC_MATCHCOL

!<BLF/PAGE>

END						! of module EDT$SCRMCOL

ELUDOM