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 %TITLE 'LSUBS - SUBSTITUTE line-mode command'
MODULE LSUBS (				! SUBSTITUTE line-mode command
		IDENT = '3-002'			! File: LSUBS.BLI Edit: GB3003
		) =
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 executes the line mode SUBSTITUTE command.
!
! ENVIRONMENT:	Runs at any access mode - AST reentrant
!
! AUTHOR: Bob Kushlis, CREATION DATE: February 3, 1978
!
! MODIFIED BY:
!
! 1-001	- Original.  DJS 30-JAN-81.  This module was created by
!	extracting the routine EDT$$LN_SUBCMD  from the module EXEC.BLI.
! 1-002	- Regularize headers.  JBS 20-Mar-1981
! 1-003	- Change substitute to EDT$$SUB_NXT .  JBS 27-Mar-1981
! 1-004 - Change paramter to FMT-STRCNT.  SMB 5-Feb-1982
! 1-005	- Give a message if there is an error setting search strings.  JBS 04-May-1982
! 1-006 - Stop processing on bad select range.  SMB 01-Jul-1982
! 1-007	- Use EDT$$FMT_CRLF instead of EDT$$OUT_FMTBUF.  JBS 05-Jul-1982
! 1-008	- Mark the screen as changed if we change anything.  JBS 07-Jul-1982
! 1-009 - Put edt$$tst_eob in line . STS 22-Sep-1982
! 1-010	- Remove EDT$$G_SCR_CHGD, new screen logic doesn't need it.  JBS 09-Oct-1982
! 1-011 - Put edt$$rng_frstln in line. STS 11-Oct-1982
! 3-001 - Start of modifications for Tops10/20.  GB Decemeber 1982.
!	  Remove moveline macro and add code to copy line number.
! 3-002 - Fix EDT$$FMT_STRCNT. CJG 22-Mar-1983
! 3-003 - Add updates from V3 sources.  GB 29-Apr-1983
!--

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

REQUIRE 'EDTSRC:TRAROUNAM';

FORWARD ROUTINE
    EDT$$LN_SUBCMD : NOVALUE;			! Process the SUBSTITUTE command

!
! INCLUDE FILES:
!

REQUIRE 'EDTSRC:EDTREQ';

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

GLOBAL ROUTINE EDT$$LN_SUBCMD 			! SUBSTITUTE line-mode command
    : NOVALUE =

!++
! FUNCTIONAL DESCRIPTION:
!
!	Command processing routine for SUBSTITUTE.   Position to the first
!	line of the range, then enter a loop getting the next line and
!	calling EDT$$SUB_NXT  to do substituions within that line.
!	If the range was null, then we do only a single substitution,
!	otherwise all are done.
!
! FORMAL PARAMETERS:
!
!	NONE
!
! IMPLICIT INPUTS:
!
!	INP_SRC
!	CUR_BUF
!	RNG_SAVPOS
!	EXE_CURCMD
!	EXE_QRYQUIT
!	EXE_SUBCNT
!	WK_LN
!
! IMPLICIT OUTPUTS:
!
!	NONE
!
! ROUTINE VALUE:
!
!	NONE
!
! SIDE EFFECTS:
!
!	NONE
!
!--

    BEGIN

    EXTERNAL ROUTINE
	EDT$$FMT_STRCNT : NOVALUE,
	EDT$$FMT_CRLF,				! Terminate an output line
	EDT$$SET_STR,
	EDT$$FMT_MSG : NOVALUE,
	EDT$$NXT_LNRNG,
    	EDT$$RNG_REPOS,
    	EDT$$RD_CURLN,
	EDT$$SUB_NXT : NOVALUE,
	EDT$$STOP_WKINGMSG : NOVALUE,		! Turn off the "working" message
	EDT$$CHK_CC;				! Check for a control C

    EXTERNAL
	LNO_ZERO : LN_BLOCK,
	INP_SRC,
	CUR_BUF : REF TBCB_BLOCK,
	RNG_SAVPOS : POS_BLOCK,
	WK_LN : REF LIN_BLOCK,
 	RNG_FRSTLN,
    	RNG_ORIGPOS : POS_BLOCK,
	EOB_LN,
	EXE_CURCMD : REF NODE_BLOCK,	! Pointer to the current command.
	EXE_QRYQUIT,			! Quit flag  for /QUERY operations.
	EXE_SUBCNT,			! No. of substitutions done.
	CC_DONE;				! Set if control C actually aborted something

    MESSAGES ((INVSTR));

    LOCAL
	STRINGS_OK,			! Flag indicating that there is a problem setting the strings
	TEMP_COUNT : LN_BLOCK,			! 6 byte count field
	SINGLE,					! Flag indicating single subs only
	FIRST,					! Flag indicating whether this is the first one.
	SEEN_CC;				! Flag indicating we have seen a control C

!+
! Get the range node.
!-

    BIND
	RANGE = .EXE_CURCMD [RANGE1] : NODE_BLOCK;

!+
! Position to the first line.
!-

    RNG_FRSTLN = 1;
    EDT$$CPY_MEM( POS_SIZE, .CUR_BUF, RNG_ORIGPOS);
    IF ( NOT EDT$$RNG_REPOS (.EXE_CURCMD [RANGE1])) THEN RETURN;

!+
! Set the single substitution flag if the range was null.
!-
    SINGLE = .RANGE [RAN_TYPE] EQL RAN_NULL;
!+
! Set flag indicating this if the first substitution, and zero the
! substitution count.
!-
    FIRST = 1;
    EXE_SUBCNT = 0;
    STRINGS_OK = 1;
    SEEN_CC = 0;
!+
! Loop over the range.
!-

    WHILE (EDT$$NXT_LNRNG (0) AND ( NOT .EXE_QRYQUIT) AND .STRINGS_OK AND ( NOT .SEEN_CC)) DO

	IF (.WK_LN NEQA EOB_LN)
	THEN
	    BEGIN
!+
! Must set up the search and replace string each time through
! in case the range involved a search string, which would clobber
! it.
!-
	    STRINGS_OK = EDT$$SET_STR ();

	    IF .STRINGS_OK
	    THEN
		BEGIN
!+
! Do substitutions in this line starting at position 0.
!-
		SEEN_CC = EDT$$CHK_CC ();

		IF ( NOT .SEEN_CC)
		THEN
		    BEGIN
		    EDT$$SUB_NXT (.SINGLE, 0);
!+
! Check to see if this was the first line in the range.
!-

		    IF .FIRST
		    THEN
!+
! Save position after first substitute so we can
! correctly reposition there.  This is nescessary since
! modifying the first line might change it's position in
! the text buffer, invalidating the previously saved position.
!-
			BEGIN
			EDT$$CPY_MEM (POS_SIZE, .CUR_BUF, RNG_SAVPOS);
			FIRST = 0;
			END;

		    END
		ELSE
		    CC_DONE = 1;

		END;

	    END;

    EDT$$STOP_WKINGMSG ();
!+
! Report a case of an invalid string.
!-

    IF ( NOT .STRINGS_OK) THEN EDT$$FMT_MSG (EDT$_INVSTR);

!+
! If the command came from the terminal, report the number of
! substitutions.
!-

    IF (.INP_SRC EQL INP_TERM)
    THEN
	BEGIN
	TEMP_COUNT [LN_LO] = .LNO_ZERO [LN_LO];
	TEMP_COUNT [LN_MD] = .LNO_ZERO [LN_MD];
	TEMP_COUNT [LN_HI] = .LNO_ZERO [LN_HI];
	TEMP_COUNT = .EXE_SUBCNT;
	EDT$$FMT_STRCNT (TEMP_COUNT, CH$PTR (UPLIT (' substitution')), 13);
	EDT$$FMT_CRLF ();
	END;

!+
! And re-position.
!-
    	EDT$$CPY_MEM(POS_SIZE, RNG_SAVPOS, .CUR_BUF);
    	EDT$$RD_CURLN();

    END;					! of routine EDT$$LN_SUBCMD


END
ELUDOM