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 %TITLE 'TITYPAHD - check for type ahead'
MODULE TITYPAHD (				! Check for type ahead
		IDENT = '1-002'			! File: TITYPAHD.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:
!
!	Check for type ahead.
!
! ENVIRONMENT:	Runs at any access mode - AST reentrant
!
! AUTHOR: Bob Kushlis, CREATION DATE: June 9, 1979
!
! MODIFIED BY:
!
! 1-001	- Original.  DJS 18-FEB-1981.  This module was created by
!	extracting routine EDT$$TI_TSTTYAHED  from module TINPUT.
! 1-002	- Regularize headers.  JBS 11-Mar-1981
! 1-003	- Revise typeahead logic.  JBS 02-Sep-1982
!--

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

REQUIRE 'EDTSRC:TRAROUNAM';

FORWARD ROUTINE
    EDT$$TI_TSTTYAHED;

!
! INCLUDE FILES:
!

REQUIRE 'EDTSRC:EDTREQ';

!
! MACROS:
!
!	NONE
!
! EQUATED SYMBOLS:
!
!	NONE
!
! OWN STORAGE:
!
!	NONE
!
! EXTERNAL REFERENCES:
!
!	In the routine
%SBTTL 'EDT$$TI_TSTTYAHED  - check for type ahead'

GLOBAL ROUTINE EDT$$TI_TSTTYAHED 		! Check for type ahead
    =

!++
! FUNCTIONAL DESCRIPTION:
!
!	This routine checks to see if a character was typed ahead.  If we
!	are in recovery mode, always return false.  If the type-ahead counter
!	is greater than 0, return true, and if not, try to read a type-ahead character
!	and if it is read, place it in the type-ahead buffer and return true.
!
! FORMAL PARAMETERS:
!
!	NONE
!
! IMPLICIT INPUTS:
!
!	RCOV_MOD
!	RDAHED
!
! IMPLICIT OUTPUTS:
!
!	RDAHEDBF
!	RDAHED
!
! ROUTINE VALUE:
!
!	0 = no type ahead
!	1 = there was type ahead
!
! SIDE EFFECTS:
!
!	NONE
!
!--

    BEGIN

    EXTERNAL ROUTINE
	EDT$$TI_RDTYAHED;

    EXTERNAL
	RCOV_MOD,			! Recovery mode flag
	RDAHED,				! Type ahead counter
	RDAHEDBF;			! Text from type-ahead

    IF .RCOV_MOD THEN RETURN (0);

    IF (.RDAHED GTR 0) THEN RETURN (1);

    RDAHED = EDT$$TI_RDTYAHED (RDAHEDBF);

    IF (.RDAHED GTR 0) THEN RETURN (1) ELSE RETURN (0);

    END;


END
ELUDOM