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 %TITLE 'CHMTADJ - tab adjust'
MODULE CHMTADJ (				! Tab adjust
		IDENT = '1-002'			! File: CHMTADJ.BLI Edit: JBS1002
		) =
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 executes the change mode command TADJ.
!
! 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$$TADJ_CMD  from module CHANGE.BLI.
! 1-002	- Regularize headers.  JBS 04-Mar-1981
!--

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

REQUIRE 'EDTSRC:TRAROUNAM';

FORWARD ROUTINE
    EDT$$TADJ_CMD : NOVALUE;			! Execute the TADJ command

!
! INCLUDE FILES:
!

REQUIRE 'EDTSRC:EDTREQ';

!
! MACROS:
!
!	NONE
!
! EQUATED SYMBOLS:
!
!	NONE
!
! OWN STORAGE:
!
!	NONE
!
! EXTERNAL REFERENCES:
!
!	In the routine
%SBTTL 'EDT$$TADJ_CMD  - tab adjust'

GLOBAL ROUTINE EDT$$TADJ_CMD 			! Tab adjust
    : NOVALUE =

!++
! FUNCTIONAL DESCRIPTION:
!
!	This routine executes the TADJ (tabs adjust) command.
!
!		Compute the column of the first non-blank non-tab character.
!		Strip out all leading spaces and tabs.
! 		Insert enough tabs and spaces to bring us to column + TADJ .
!
! FORMAL PARAMETERS:
!
!	NONE
!
! IMPLICIT INPUTS:
!
!	TAB_SIZ
!	TADJ
!	LN_BUF
!	LN_END
!
! IMPLICIT OUTPUTS:
!
!	NONE
!
! ROUTINE VALUE:
!
!	NONE
!
! SIDE EFFECTS:
!
!	NONE
!
!--

    BEGIN

    EXTERNAL ROUTINE
	EDT$$DEL_CHS : NOVALUE,			! Delete part of the current line
	EDT$$MOV_TOCOL,				! Insert tabs and spaces
	EDT$$FMT_CHWID;				! Compute character size.

    ! Keep track of the bounds within which the current line must be updated

    EXTERNAL
	TAB_SIZ,				! Structured tab size
	TADJ,				! Count for tabs adjust.
	LN_BUF,				! Current line buffer
	LN_END;				! End of current line pointer

    LOCAL
	CP,
	COL;

    LABEL
	BL;

    CP = CH$PTR (LN_BUF,, BYTE_SIZE);
    COL = 0;
BL :
    BEGIN

    WHILE 1 DO
	BEGIN

	IF CH$PTR_EQL (.LN_END, .CP) THEN LEAVE BL;

	SELECTONE CH$RCHAR_A (CP) OF
	    SET

	    [%C' '] :
		COL = .COL + 1;

	    [ASC_K_TAB] :
		COL = .COL + EDT$$FMT_CHWID (ASC_K_TAB, .COL);

	    [OTHERWISE] :
		EXITLOOP;
	    TES;

	END;

    EDT$$DEL_CHS (CH$PTR (LN_BUF,, BYTE_SIZE), CH$PLUS (.CP, -1));
    EDT$$MOV_TOCOL (.COL + .TADJ*.TAB_SIZ);
    END;
    END;


END
ELUDOM