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 %TITLE 'FCOLINC - compute formatted character width'
MODULE FCOLINC (				! Compute formatted character width
		IDENT = '3-003'			! File: FCOLINC.BLI Edit: GB3003
		) =
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:
!
!	Compute formatted character width.
!
! ENVIRONMENT:	Runs at any access mode - AST reentrant
!
! AUTHOR: Bob Kushlis, CREATION DATE: March 18, 1979
!
! MODIFIED BY:
!
! 1-001	- Original.  DJS 19-FEB-1981.  This module was created by
!	extracting routine EDT$$FMT_CHWID  from module FORMAT.
! 1-002	- Regularize headers.  JBS 05-Mar-1981
! 1-003 - Change length of form feed string. STS 08-Oct-1981
! 1-004	- Add support for DEC STD 169.  JBS 11-Aug-1982
! 1-005	- Remove ".L32".  JBS 12-Aug-1982
! 1-006	- Add conditional for VT220 support.  JBS 10-Feb-1983
! 1-007	- Deduce the width of unusual characters from their representation table.  JBS 04-Mar-1983
! 1-008	- Correct the computation for characters on an 8-bit terminal.  JBS 07-Mar-1983
! 3-001 - Use string ptr to access US_TXT.  GB 3-Feb-1983
! 3-002 - Add updates from V3 source kit. GB 27-Apr-1983
! 3-003 - Remove VT220 conditionals. CJG 25-Nov-1983
!--

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

REQUIRE 'EDTSRC:TRAROUNAM';

FORWARD ROUTINE
    EDT$$FMT_CHWID;

!
! INCLUDE FILES:
!

REQUIRE 'EDTSRC:EDTREQ';

LIBRARY 'EDTSRC:TRANSLATE';

!
! MACROS:
!
!	NONE
!
! EQUATED SYMBOLS:
!
!	NONE
!
! OWN STORAGE:
!
!	NONE
!
! EXTERNAL REFERENCES:
!
!	In the routine
%SBTTL 'EDT$$FMT_CHWID  - compute formatted character width'

GLOBAL ROUTINE EDT$$FMT_CHWID (			! Compute formatted character width
	CHAR, 					! Character whose width to compute
	COLUMN					! Current column (for tabs)
    ) =

!++
! FUNCTIONAL DESCRIPTION:
!
!	This routine computes the number of character positions a character would
!	take to display at a specified column.
!
! FORMAL PARAMETERS:
!
!  CHAR			The character to be displayed.
!
!  COLUMN		The starting column.  (0 is the first column on a line)
!
! IMPLICIT INPUTS:
!
!	US_TXT
!	EIGHT_BIT
!
! IMPLICIT OUTPUTS:
!
!	NONE
!
! ROUTINE VALUE:
!
!	The number of chraracter positions the character would occupy.
!
! SIDE EFFECTS:
!
!	NONE
!
!--

    BEGIN

    EXTERNAL
	EIGHT_BIT,			! 1 = this is an eight-bit terminal
	CHAR_INFO : BLOCKVECTOR [256, 1],	! Table of information about characters
	CHAR_NAMES,			! Names of some characters
	CHAR_NAMES_LEN,			! Length of the names table
	US_TXT : VECTOR;

    LOCAL
	C;

    C = .CHAR AND %X'7F';

    SELECTONE .C OF
	SET

	[ASC_K_TAB] :
	    RETURN (8 - (.COLUMN MOD 8));

	[ASC_K_FF] :
	    BEGIN
	    LOCAL
		LEN;
	    LEN = ..US_TXT[1];
	    RETURN (.LEN);
	    END;

	[OTHERWISE] :
	    BEGIN

	    LOCAL
		LEN;

	    CASE .CHAR_INFO [.C, CI_DSP] FROM 0 TO 3 OF
		SET

		[0] :
		    RETURN (1);			! Normal character

		[1] :
		    RETURN (2);			! ^C

		[2] :
		    BEGIN			! <name>

		    IF (.EIGHT_BIT AND (.C GEQ %X'A0'))
		    THEN
			RETURN (1)
		    ELSE
			BEGIN
			LEN = 2 + .CHAR_INFO [.C, CI_LEN];
			RETURN (.LEN);
			END;

		    END;

		[3] :
		    RETURN (5);			! <Xnn>
		TES;

	    END;
	TES;

    END;					! of routine EDT$$FMT_CHWID

!<BLF/PAGE>

END						! of module EDT$FCOLINC

ELUDOM