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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) 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 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