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 %TITLE 'LSUBSN - SUBSTITUTE NEXT line-mode command'
MODULE LSUBSN (				! SUBSTITUTE NEXT line-mode command
		IDENT = '3-001'			! File: LSUBSN.BLI Edit: GB3001
		) =
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 line mode SUBSTITUTE NEXT 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-1981.  This module was created by
!	extracting the routine EDT$$SUB_NXTCMD  from the module EXEC.BLI.
! 1-002	- Regularize headers.  JBS 20-Mar-1981
! 1-003	- Change SUBSTITUTE to EDT$$SUB_NXT .  JBS 27-Mar-1981
! 1-004	- Worry about string truncation.  JBS 05-May-1982
! 1-005	- Refresh the screen if this command is executed under EXT.  JBS 07-Jul-1982
! 1-006 - Put edt$$tst_eob in line. STS 22-Sep-1982
! 1-007	- Remove EDT$$G_SCR_CHGD, not needed by new screen logic.  JBS 09-Oct-1982
! 3-001 - Add updates from V3 sources.  GB 29-Apr-1983
!--

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

REQUIRE 'EDTSRC:TRAROUNAM';

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

!
! INCLUDE FILES:
!

REQUIRE 'EDTSRC:EDTREQ';

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

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

!++
! FUNCTIONAL SPECIFICATION:
!
!	Command processing routine for SUBSTITUTE NEXT.  This command keeps
!	trying to do a substitution until it succeeds.
!
! FORMAL PARAMETERS:
!
!	NONE
!
! IMPLICIT INPUTS:
!
!	CUR_BUF
!	EXE_CURCMD
!	WK_LN
!
! IMPLICIT OUTPUTS:
!
!	EXE_SUBCNT
!
! ROUTINE VALUE:
!
!	NONE
!
! SIDE EFFECTS:
!
!	NONE
!
!--

    BEGIN

    EXTERNAL ROUTINE
	EDT$$SET_STR,
	EDT$$SUB_NXT : NOVALUE,
	EDT$$RD_CURLN,
	EDT$$RD_NXTLN,
	EDT$$FMT_MSG : NOVALUE;

    EXTERNAL
	CUR_BUF : REF TBCB_BLOCK,
	WK_LN : REF LIN_BLOCK,
	EOB_LN,
	EXE_CURCMD : REF NODE_BLOCK,	! Pointer to the current command.
	EXE_SUBCNT;			! No. of substitutions done.

    LOCAL
	STRINGS_OK;

    MESSAGES ((INVSTR));
    STRINGS_OK = 1;
!+
! Check to see if new search and replace strings were specified and, if
! they were, set them up.
!-

    IF (.EXE_CURCMD [STR_PNT] NEQ 0) THEN STRINGS_OK = EDT$$SET_STR ();

!+
! Zero the substitute count.
!-
    EXE_SUBCNT = 0;
!+
! Make sure we are correctly positioned at the current line.
!-
    EDT$$RD_CURLN ();
!+
! Loop until a substitution is done or the end of buffer is encountered.
!-

    WHILE ((.WK_LN NEQA EOB_LN) AND (.EXE_SUBCNT EQL 0) AND .STRINGS_OK) DO
	BEGIN
!+
! Attempt a single substition on this line starting at the cursor
! position.
!-
	EDT$$SUB_NXT (1, .CUR_BUF [TBCB_CHAR_POS]);
!+
! If no substitutions were performed, try again on the next line.
!-

	IF (.EXE_SUBCNT EQL 0) THEN EDT$$RD_NXTLN ();

	END;

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

    END;					! of routine EDT$$SUB_NXTCMD


END
ELUDOM