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 %TITLE 'CHMGDIR - look for a direction indicator'
MODULE CHMGDIR (				! Look for a direction indicator
		IDENT = '1-005'			! File: CHMGDIR.BLI Edit: JBS1005
		) =
BEGIN
!COPYRIGHT (c) DIGITAL EQUIPMENT CORPORATION 1981, 1988.  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 THAT IS NOT SUPPLIED BY DIGITAL.
!
!
!++
! FACILITY:	EDT -- The DEC Standard Editor
!
! ABSTRACT:
!
!	This module looks for an explicit direction indicator.
!
! ENVIRONMENT:	Runs at any access mode - AST reentrant
!
! AUTHOR: Bob Kushlis, CREATION DATE: Unknown
!
! MODIFIED BY:
!
! 1-001	- Original.  DJS 04-Feb-1981.  This module was created by
!	extracting the routine EDT$$CHK_DIR  from module CHANGE.BLI.
! 1-002	- Regularize headers.  JBS 02-Mar-1981
! 1-003	- Correct the file name.  JBS 11-Mar-1981
! 1-004 - Add a return value to flag direction setting.  SMB 22-Oct-1981
! 1-005	- Remove leading blank line--it confused EDIT11, thus not converting
!	   the module name to PDP-11 format.  JBS 27-Oct-1981
!--

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

REQUIRE 'EDTSRC:TRAROUNAM';

FORWARD ROUTINE
    EDT$$CHK_DIR;				! Determine the current direction

!
! INCLUDE FILES:
!

REQUIRE 'EDTSRC:EDTREQ';

!
! MACROS:
!
!	NONE
!
! EQUATED SYMBOLS:
!
!	NONE
!
! OWN STORAGE:
!
!	NONE
!
! EXTERNAL REFERENCES:
!
!	In the routine
%SBTTL 'EDT$$CHK_DIR  - look for a direction indicator'

GLOBAL ROUTINE EDT$$CHK_DIR 			! Look for a direction indicator
    =

!++
! FUNCTIONAL DESCRIPTION:
!
!	This little routine looks for an explicit direction indicator (+ or -) and sets
!	DIRN  accordingly.  If no direction is seen, DIRN
!	is left unchanged.
!
! FORMAL PARAMETERS:
!
!	NONE
!
! IMPLICIT INPUTS:
!
!	CMD_PTR
!
! IMPLICIT OUTPUTS:
!
!	DIRN
!
! ROUTINE VALUE:
!
!	0 - direction forward or explicitly set backward (with '-')
!	1 - direction backward but not set explicitly
!
! SIDE EFFECTS:
!
!	NONE
!
!--

    BEGIN

    EXTERNAL
	DIRN,				! The current direction.
	CMD_PTR;				! Command string pointer

    IF (CH$RCHAR (.CMD_PTR) EQL %C'-')
    THEN
	DIRN = DIR_BACKWARD
    ELSE

	IF (CH$RCHAR (.CMD_PTR) EQL %C'+')
	THEN
	    DIRN = DIR_FORWARD
	ELSE
!+
! Special handling for cases where we want a count which is not preceded by a
! '+' or '-' to be flagged as '+' rather than being left unchanged.
!-

	    IF (.DIRN EQL DIR_BACKWARD) THEN RETURN (1) ELSE RETURN (0);

    CMD_PTR = CH$PLUS (.CMD_PTR, 1);
    RETURN (0);
    END;


END
ELUDOM