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 %TITLE 'CHMUNDEL - undelete'
MODULE CHMUNDEL (				! Undelete
		IDENT = '3-001'			! File: CHMUNDEL.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 performs the undeletion of text associated
!	with the change mode commands UNDC, UNDW, and UNDL.
!
! 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 UNDELETE from the module CHANGE.BLI.
! 1-002	- Regularize headers.  JBS 04-Mar-1981
! 1-003 - Replace call to edt$$tst_eob. STS 22-Sep-1982
! 1-004	- Don't turn an undelete of an empty line into a noop at EOB.  JBS 01-Dec-1982
!--

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

REQUIRE 'EDTSRC:TRAROUNAM';

FORWARD ROUTINE
    EDT$$UNDL;					! Insert the contents of an undelete buffer

!
! INCLUDE FILES:
!

REQUIRE 'EDTSRC:EDTREQ';

!
! MACROS:
!
!	NONE
!
! EQUATED SYMBOLS:
!
!	NONE
!
! OWN STORAGE:
!
!	NONE
!
! EXTERNAL REFERENCES:
!
!	In the routine
%SBTTL 'EDT$$UNDL  - undelete'

GLOBAL ROUTINE EDT$$UNDL (			! Undelete
	BUF, 					! Address of the appropriate undelete buffer
	LEN					! Length of that buffer
    ) =

!++
! FUNCTIONAL DESCRIPTION:
!
!	Insert the contents of an undelete buffer and move to whichever end.
!
! FORMAL PARAMETERS:
!
!  BUF 			the address of the undelete buffer.  Its first character is
!     			the direction indicator.
!
!  LEN 			the length of the buffer.
!
! IMPLICIT INPUTS:
!
!	NONE
!
! IMPLICIT OUTPUTS:
!
!	NONE
!
! ROUTINE VALUE:
!
!	1 is returned if successful, 0 otherwise.
!
! SIDE EFFECTS:
!
!	NONE
!
!--

    BEGIN

    EXTERNAL ROUTINE
	EDT$$INS_CHS,			! Insert a string of characters which may include carriage returns
	EDT$$CS_LEFT;				! Move left a character

    EXTERNAL
	WK_LN : REF LIN_BLOCK,
	EOB_LN;

    LOCAL
	DIR,
	RLEN,
	BUF_POINT;

    RLEN = .LEN;
!+
! Check for special case of entering an unnecessary carriage return
! at the end of the buffer.
!-

    IF ((.WK_LN EQLA EOB_LN) AND 	!
	(.RLEN GTR 1) AND 			!
	(CH$RCHAR (CH$PTR (.BUF, .RLEN, BYTE_SIZE)) EQL ASC_K_CR))
    THEN
	RLEN = .RLEN - 1;

    BUF_POINT = CH$PTR (.BUF,, BYTE_SIZE);
!+
! Get the direction indicator.
!-
    DIR = CH$RCHAR_A (BUF_POINT);

    IF (EDT$$INS_CHS (.BUF_POINT, .RLEN) EQL 0) THEN RETURN (0);

!+
! If the delete was a forward one, position to the beginning of the
! string we just inserted.
!-

    IF (.DIR NEQ DIR_BACKWARD)
    THEN

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

    RETURN (1);
    END;


END
ELUDOM