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 %TITLE 'SCRNCOL - compute new column position'
MODULE SCRNCOL (				! Compute new column position
		IDENT = '3-001'			! File: SCRNCOL.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 computes a new column position for vertical moves.
!
! 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_CPUNEWCOLPOS  from module SCREEN.
! 1-002	- Regularize headers.  JBS 13-Mar-1981
! 1-003	- Avoid using the screen data base, since the current line may not
!	   be on the screen.  JBS 10-Sep-1982
! 3-001 - Add updates from V3 sources.  GB 03-May-1983
!--

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

REQUIRE 'EDTSRC:TRAROUNAM';

FORWARD ROUTINE
    EDT$$SC_CPUNEWCOLPOS : NOVALUE;

!
! INCLUDE FILES:
!

REQUIRE 'EDTSRC:EDTREQ';

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

%SBTTL 'EDT$$SC_CPUNEWCOLPOS  - compute new column position'

GLOBAL ROUTINE EDT$$SC_CPUNEWCOLPOS 		! Compute new column position
    : NOVALUE =

!++
! FUNCTIONAL DESCRIPTION:
!
!	This routine computes a new column position for vertical moves.  When
!	any command other than a vertical arrow which moves the cursor is executed
!	this procedure is called to get the new column position for vertical moves.
!	The column position is kept in COL .
!
! FORMAL PARAMETERS:
!
!	NONE
!
! IMPLICIT INPUTS:
!
!	LN_BUF
!	LN_PTR
!
! IMPLICIT OUTPUTS:
!
!	COL
!
! 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.
	LN_BUF,				! Current line buffer.
	LN_PTR;				! Current character pointer.

    LOCAL
	COL_POINT;

    COL_POINT = CH$PTR (LN_BUF,, BYTE_SIZE);
    COL = 0;

    WHILE CH$PTR_NEQ (.COL_POINT, .LN_PTR) DO
	COL = .COL + EDT$$FMT_CHWID (CH$RCHAR_A (COL_POINT), .COL);

    END;					! of routine EDT$$SC_CPUNEWCOLPOS

!<BLF/PAGE>

END						! of module EDT$SCRNCOL

ELUDOM