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 %TITLE 'CHMSUBS - change mode SUBSTITUTE command'
MODULE CHMSUBS (				! Change mode SUBSTITUTE command
		IDENT = '3-002'			! File: CHMSUBS.BLI Edit: CJG3002
		) =
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 SUBSTITUTE (S) command.
!
! 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$$SUB_CMD  from module CHANGE.BLI.
! 1-002	- Regularize headers.  JBS 04-Mar-1981
! 1-003	- Use new message codes.  JBS 04-Aug-1981
! 1-004 - New cursor position on backwards substitute.  SMB 28-Oct-1981
! 1-005	- Delete initial blank line by running through PRETTY.  JBS 02-Nov-1981
! 1-006 - Rework edit 1-004 to accomplish the same thing without changing
!	  the cursor position from V2.  SMB 17-Aug-1982
! 1-007	- Remove EDT$$G_LN_NO for new screen update logic.  JBS 29-Sep-1982
! 1-008	- Pass the correct number of lines to EDT$$DEL_TXTLN.  JBS 08-Oct-1982
! 3-001 - Add updates from V3 sources.  GB 27-Apr-1983
! 3-002 - Fix insertion of replacement string. CJG 6-Oct-1983
!--

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

REQUIRE 'EDTSRC:TRAROUNAM';

FORWARD ROUTINE
    EDT$$SUB_CMD;				! Execute the SUBSTITUTE command

!
! INCLUDE FILES:
!

REQUIRE 'EDTSRC:EDTREQ';

!
! MACROS:
!
!	NONE
!
! EQUATED SYMBOLS:
!
!	NONE
!
! OWN STORAGE:
!
!	NONE
!
! EXTERNAL REFERENCES:
!
!	In the routine
%SBTTL 'EDT$$SUB_CMD  - change mode SUBSTITUTE command'

GLOBAL ROUTINE EDT$$SUB_CMD 			! Change mode SUBSTITUTE command
    =

!++
! FUNCTIONAL DESCRIPTION:
!
!	This routine implements the SUBSTITUTE command.  Just search for the
!	search string, delete it and insert the replace string.
!
! FORMAL PARAMETERS:
!
!	NONE
!
! IMPLICIT INPUTS:
!
!	DIRN
!	LN_PTR
!	SEA_STRLEN
!	SEA_STR
!	SUB_STRLEN
!    	SUB_STR
!
! IMPLICIT OUTPUTS:
!
!	NONE
!
! ROUTINE VALUE:
!
!	1 = substitution made, 0 = not made (string not found, or control C)
!
! SIDE EFFECTS:
!
!	NONE
!
!--

    BEGIN

    EXTERNAL ROUTINE
	EDT$$DEL_TXTLN : NOVALUE,	! Delete whole lines of text
	EDT$$INS_CHS,			! Insert a string of characters which may include carriage returns
	EDT$$MSG_BELL : NOVALUE,	! Output a message to the terminal with a warning bell
	EDT$$STR_SEACMD,		! Search for a specific string
	EDT$$CS_LEFT,			! Move left a character
	EDT$$CS_RIGHT;			! Move right a character

    EXTERNAL
	LNO0,				! 1
	DIRN,				! The current direction.
	LN_PTR,				! Current character pointer
	SEA_STRLEN,			! Length of current search string
	SEA_STR,			! Current search string
	SUB_STRLEN,			! Length of subs string
	SUB_STR,			! Current SUBSTITUTE string
	CUR_BUF : REF TBCB_BLOCK;	! Current text buffer control block

    MESSAGES ((STRNOTFND, BADRANGE));

    LOCAL
	STS,
	NUM_LINES : LN_BLOCK,
	END_POS;

!+
! Search for the string.
!-
    IF (.DIRN EQL DIR_BACKWARD)
    THEN
!+
! Move back one position before starting the search
!-
	STS = EDT$$STR_SEACMD (SEA_STR, .SEA_STRLEN, 1, .DIRN)
    ELSE
	STS = EDT$$STR_SEACMD (SEA_STR, .SEA_STRLEN, 0, .DIRN);

    IF (.STS EQL 1)
    THEN
!+
! String was found, do the SUBSTITUTE.
!-
	BEGIN
!+
! Move to the end of the string, counting the lines involved.
!-
	MOVELINE (CUR_BUF [TBCB_CUR_LIN], NUM_LINES);

	DECR I FROM .SEA_STRLEN - 1 TO 0 DO
	    EDT$$CS_RIGHT ();

	SUBLINE (NUM_LINES, CUR_BUF [TBCB_CUR_LIN], NUM_LINES);
	ADDLINE (LNO0, NUM_LINES, NUM_LINES);
	END_POS = .LN_PTR;

!+
! Move back to the beginning.
!-

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

!+
! Make sure the string isn't too long.
!-

	IF ((.NUM_LINES [LN_HI] NEQU 0) OR (.NUM_LINES [LN_MD] NEQU 0))
	THEN
	    BEGIN
	    EDT$$MSG_BELL (EDT$_BADRANGE);
	    RETURN (0);
	    END;

!+
! Delete the string.
!-
	EDT$$DEL_TXTLN (.NUM_LINES [LN_LO], .END_POS);
!+
! Insert the replacement string.
!-
	EDT$$INS_CHS (CH$PTR (SUB_STR,, BYTE_SIZE), .SUB_STRLEN);
!+
! If we are moving backward, then move back across the string
!-

	IF (.DIRN EQL DIR_BACKWARD)
	THEN

	    DECR I FROM .SUB_STRLEN TO 1 DO
		EDT$$CS_LEFT ();

	RETURN (1);
	END
    ELSE
	BEGIN
!+
! String was not found, EDT$$MSG_BELL  an error.
!-

	IF (.STS EQL 0) THEN EDT$$MSG_BELL (EDT$_STRNOTFND);

	RETURN (0);
	END;

    END;


END
ELUDOM