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 %TITLE 'CHMSCHSTR - search for a string'
MODULE CHMSCHSTR (				! Search for a string
		IDENT = '3-005'			! File: CHMSCHSTR.BLI Edit: GB3005
		) =
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 scans text looking for the search string.
!
! 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$$STR_SEA  from module CHANGE.BLI.
! 1-002	- Regularize header.  JBS 03-Mar-1981
! 1-003	- Don't check for control C so frequently.  JBS 28-Jul-1981
! 1-004	- Add new WPS search.  STS 05-Oct-1981 (note added 24-May-1982)
! 1-005	- Set a flag if control C actually aborts something.  JBS 24-May-1982
! 1-006	- Remove EDT$$A_STR_CMP.  JBS 20-Jul-1982
! 1-007	- Remove reference to EDT$$TST_CHALFA, it is not used.  JBS 20-Jul-1982
! 1-008	- Do some work on performance.  JBS 04-Jan-1983
! 1-009	- Add conditionals for VT220 support.  JBS 11-Feb-1983
! 3-001 - Make quoted characters right justified with %C.  GB 24-Mar-1983
! 3-002 - Fix problem with forward searches.  GB 7-Apr-1983
! 3-003 - Add updates from V3 sources.  GB 27-Apr-1983
! 3-004 - Revise code to speed up searches.  GB 2--Jun-1983
! 3-005 - Remove VT220 conditional to speed up code. CJG 25-Nov-1983
!--

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

REQUIRE 'EDTSRC:TRAROUNAM';


FORWARD ROUTINE
    EDT$$STR_SEA;

!
! INCLUDE FILES:
!

REQUIRE 'EDTSRC:EDTREQ';

LIBRARY 'EDTSRC:TRANSLATE';

!
! MACROS:
!
!	NONE
!
! EQUATED SYMBOLS:
!
!	NONE
!
! OWN STORAGE:
!
!	NONE
!
! EXTERNAL REFERENCES:
!
!	In the routine
%SBTTL 'EDT$$STR_SEA  - search for a string'

GLOBAL ROUTINE EDT$$STR_SEA (			! Search for a string
    ADDR, 					! Pointer to the model string
    LEN, 					! Length of the model string
    DIR						! Direction to search
    ) =

!++
! FUNCTIONAL DESCRIPTION:
!
!	Search the text for a given string.
!
! FORMAL PARAMETERS:
!
!  ADDR			Pointer to the string to find
!
!  LEN			Length of the string to find
!
!  DIR			Direction in which to search
!
! IMPLICIT INPUTS:
!
!	EXCT_MATCH
!	CUR_BUF
!	WK_LN
!
! IMPLICIT OUTPUTS:
!
!	CUR_BUF
!	CC_DONE
!
! ROUTINE VALUE:
!
!	0		Not found
!	1		Found
!	2		Terminated by control C
!
! SIDE EFFECTS:
!
!	NONE
!
!--

    BEGIN

    EXTERNAL ROUTINE
	EDT$$CHK_CC,			! Check to see if a CTRL/C has been typed
	EDT$$RD_NXTLN,			! Move forward a line
	EDT$$RD_PRVLN,			! Move backward a line
	EDT$$STR_CMP;			! Compare two strings of equal length

    EXTERNAL
	EXCT_MATCH,			! Exact search or no.
	CUR_BUF : REF TBCB_BLOCK,	! The current buffer tbcb
	WK_LN : REF LIN_BLOCK,		! Current line pointer
	CC_DONE;			! Set to 1 if control C actually aborted something

    BIND
	GENERAL_TABLE = UPLIT (CHAR_GENERAL_TAB) : VECTOR [256];

    LOCAL
	REM,
	LP,
	LE,
	SP,
	FC,
	L_LEN,					! Local copy of length parameter
	P_GEN_TABLE : REF VECTOR [256];	! Pointer to table declared above

!+
! Remember the first character so we can avoid compares
! when first characters cannot possibly match.
!-

    FC = CH$RCHAR (.ADDR);

!+
! Get a pointer to the translate table, to speed access to it.
!-

    P_GEN_TABLE = GENERAL_TABLE [0];

!+
! Get a local copy of the length parameter, to speed tests of it.
!-

    L_LEN = .LEN;
    SP = CH$PTR (WK_LN [LIN_TEXT], 0, BYTE_SIZE);
    LP = CH$PLUS (.SP, .CUR_BUF [TBCB_CHAR_POS]);
    REM = .WK_LN [LIN_LENGTH] - .CUR_BUF [TBCB_CHAR_POS];

    WHILE 1 DO
	BEGIN

	IF (.REM GEQ .L_LEN)
	THEN
!+
! Perform a quick test for feasibility; this will avoid calling EDT$$STR_CMP for many
! non-matches.
!-

	IF (.P_GEN_TABLE [CH$RCHAR (.LP)] EQL .P_GEN_TABLE [.FC])
	THEN

	    IF EDT$$STR_CMP (.LP, .ADDR, .L_LEN, .EXCT_MATCH)
	    THEN
		BEGIN
		CUR_BUF [TBCB_CHAR_POS] = CH$DIFF (.LP, .SP);
		RETURN (1);
		END;


	IF (.DIR EQL DIR_BACKWARD)
	THEN

	    IF (.LP EQL .SP)
	    THEN
		BEGIN

		IF ( NOT EDT$$RD_PRVLN ()) THEN RETURN (0);

		IF EDT$$CHK_CC ()
		THEN
		    BEGIN
		    CC_DONE = 1;
		    RETURN (2);
		    END;

		SP = CH$PTR (WK_LN [LIN_TEXT], 0, BYTE_SIZE);
		LP = CH$PLUS (.SP, .WK_LN [LIN_LENGTH]);
		REM = 0;
		END
	    ELSE
		BEGIN
		LP = CH$PLUS (.LP, -1);
		REM = .REM + 1;
		END

	ELSE

	    IF (.REM LEQ .L_LEN)
	    THEN
		BEGIN

		IF ( NOT EDT$$RD_NXTLN ()) THEN RETURN (0);

		IF EDT$$CHK_CC ()
		THEN
		    BEGIN
		    CC_DONE = 1;
		    RETURN (2);
		    END;

		LP = SP = CH$PTR (WK_LN [LIN_TEXT], 0, BYTE_SIZE);
		REM = .WK_LN [LIN_LENGTH];
		END
	    ELSE
		BEGIN
		LP = CH$PLUS (.LP, 1);
		REM = .REM - 1;
		END

	END

    END;					! of routine EDT$$STR_SEA


END
ELUDOM