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 %TITLE 'CHMSAVTXT - save deleted text'
MODULE CHMSAVTXT (				! Save deleted text
		IDENT = '1-002'			! File: CHMSAVTXT.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 saves text deleted by a delete line or word
!	command in the associated undelete buffer.
!
! 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$$SAV_DELTXT  from module CHANGE.BLI.
! 1-002	- Regularize headers.  JBS 03-Mar-1981
!--

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

REQUIRE 'EDTSRC:TRAROUNAM';

FORWARD ROUTINE
    EDT$$SAV_DELTXT : NOVALUE;			! Save a deleted word or line in an undelete buffer

!
! INCLUDE FILES:
!

REQUIRE 'EDTSRC:EDTREQ';

!
! MACROS:
!
!	NONE
!
! EQUATED SYMBOLS:
!
!	NONE
!
! OWN STORAGE:
!
!	NONE
!
! EXTERNAL REFERENCES:
!
!	In the routine
%SBTTL 'EDT$$SAV_DELTXT  - save deleted text'

GLOBAL ROUTINE EDT$$SAV_DELTXT (		! Save deleted text
	NC, 					! Number of characters to save
	DEL_BUF, 				! Address of delete buffer
	BUF_LEN					! Place to store the length
    ) : NOVALUE =

!++
! FUNCTIONAL DESCRIPTION:
!
!	Save the text deleted by a delete line or word command in the
!	associated undelete buffer.
!
! FORMAL PARAMETERS:
!
!  NC 			the number of characters to save
!
!  DEL_BUF 		the address of the delete buffer
!
!  DEL_LEN 		the address in which to save the length
!
! IMPLICIT INPUTS:
!
!	DIRN
!	LN_PTR
!
! IMPLICIT OUTPUTS:
!
!	NONE
!
! ROUTINE VALUE:
!
!	NONE
!
! SIDE EFFECTS:
!
!	NONE
!
!--

    BEGIN

    EXTERNAL ROUTINE
	EDT$$CS_LEFT,				! Move left a character
	EDT$$CS_RIGHT;				! Move right a character

    EXTERNAL
	DIRN,				! The current direction.
	LN_PTR;				! Current character pointer

    LOCAL
	BUF_POINT;

!+
! Put the direction in the first char of the buffer.
!-
    BUF_POINT = CH$PTR (.DEL_BUF,, BYTE_SIZE);
    CH$WCHAR_A (.DIRN, BUF_POINT);
!+
! If it is a forward delete, then go back to the beginning.
!-

    IF (.DIRN NEQ DIR_BACKWARD)
    THEN

	DECR I FROM .NC - 1 TO 0 DO
	    EDT$$CS_LEFT ();

!+
! Save the text, ending up at the end.
!-

    INCR I FROM 1 TO .NC DO
	BEGIN

	IF (.I LEQ .BUF_LEN) THEN CH$WCHAR_A (CH$RCHAR (.LN_PTR), BUF_POINT);

	EDT$$CS_RIGHT ();
	END;

!+
! If is is a backward delete, move back to the beginning.
!-

    IF (.DIRN EQL DIR_BACKWARD)
    THEN

	DECR I FROM .NC - 1 TO 0 DO
	    EDT$$CS_LEFT ();

    END;


END
ELUDOM