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 %TITLE 'SCRCHKREV - reverse video in select range'
MODULE SCRCHKREV (				! Reverse video in select range
		IDENT = '3-001'			! File: SCRCHKREV.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 checks to see if the current line is within
!	the select range, and forces the screen into normal or
!	reverse video, accordingly.
!
! 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 CHECK_REVERSE from module SCREEN.
! 1-002	- Regularize headers.  JBS 13-Mar-1981
! 1-003	- Revise the definition of EDT$$G_CS_CHNO.  JBS 27-Dec-1982
! 3-001 - Add updatE from V3 sources.  GB 03-May-1983
!--

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

REQUIRE 'EDTSRC:TRAROUNAM';

FORWARD ROUTINE
    EDT$$SC_REVIDCHK : NOVALUE;

!
! INCLUDE FILES:
!

REQUIRE 'EDTSRC:EDTREQ';

!
! MACROS:
!
!	NONE
!
! EQUATED SYMBOLS:
!
!	NONE
!
! OWN STORAGE:
!
!	NONE
!
! EXTERNAL REFERENCES:
!
!	In the routine
%SBTTL 'EDT$$SC_REVIDCHK  - reverse video in select range'

GLOBAL ROUTINE EDT$$SC_REVIDCHK (		! Reverse video in select range
	CP					! Current position in line buffer
    ) : NOVALUE =

!++
! FUNCTIONAL DESCRIPTION:
!
!	This routine checks to see if we are inside the select range, and forces
!	the screen into either reverse or normal video based on the result.
!
! FORMAL PARAMETERS:
!
!  CP			Current position in the line buffer
!
! IMPLICIT INPUTS:
!
!	CS_CHNO
!	CS_LN
!	SEL_LN
!	SEL_POS
!	TI_TYP
!	LN_BUF
!
! IMPLICIT OUTPUTS:
!
!	NONE
!
! ROUTINE VALUE:
!
!	NONE
!
! SIDE EFFECTS:
!
!	Puts the screen in either normal or reverse video.
!
!--

    BEGIN

    EXTERNAL ROUTINE
	EDT$$SC_CMPPOS,
	EDT$$SC_REVID : NOVALUE,
	EDT$$SC_NONREVID : NOVALUE;

    EXTERNAL
	CS_CHNO,				! character position of cursor.
	CS_LN : LN_BLOCK,		! relative line number of cursor line.
	SEL_LN : LN_BLOCK,		! Relative line number of select.
	SEL_POS,				! select position.
	TI_TYP,				! Terminal type.
	LN_BUF;				! Current line buffer.

    LOCAL
	CPOINT;

    CPOINT = CH$PTR (LN_BUF, .CP, BYTE_SIZE);

    IF (.TI_TYP EQL TERM_VT100)
    THEN

	IF (EDT$$SC_CMPPOS (.CPOINT, CS_LN, CH$PTR (LN_BUF, .CS_CHNO, BYTE_SIZE))
		NEQ EDT$$SC_CMPPOS (.CPOINT, SEL_LN, .SEL_POS))
	THEN
	    EDT$$SC_REVID ()
	ELSE
	    EDT$$SC_NONREVID ();

    END;


END
ELUDOM