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 %TITLE 'UFSTRING - line-mode string search'
MODULE UFSTRING (				! Line-mode string search
		IDENT = '3-001'			! File: UFSTRING.BLI Edit: CJG3001
		) =
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:
!
!	Line-mode string search.
!
! ENVIRONMENT:	Runs at any access mode - AST reentrant
!
! AUTHOR: Bob Kushlis, CREATION DATE: February 7, 1978
!
! MODIFIED BY:
!
! 1-001	- Original.  DJS 19-FEB-1981.  This module was created by
!	extracting routine U_F_STRING from module UTIL.
! 1-002	- Regularize headers and remove control C checking.  JBS 11-Mar-1981
! 1-003	- Worry about string truncation.  JBS 05-May-1982
! 1-004 - Put in check for control C. STS 15-Jun-1982
! 1-005	- Remove EDT$$A_STR_CMP.  JBS 16-Jul-1982
! 3-001 - Fix string pointer in call to string compare. CJG 24-Mar-1983
!--

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

REQUIRE 'EDTSRC:TRAROUNAM';

FORWARD ROUTINE
    EDT$$FND_STR;

!
! INCLUDE FILES:
!

REQUIRE 'EDTSRC:EDTREQ';

!
! MACROS:
!
!	NONE
!
! EQUATED SYMBOLS:
!
!	NONE
!
! OWN STORAGE:
!
!	NONE
!
! EXTERNAL REFERENCES:
!
!	In the routine
%SBTTL 'EDT$$FND_STR  - line-mode string search'

GLOBAL ROUTINE EDT$$FND_STR (			! Line-mode string search
    STRING, 					! Pointer to model string
    LEN, 					! Length of model string
    DIR						! Direction of search
    ) =

!++
! FUNCTIONAL DESCRIPTION:
!
!	Line mode string search routine.  Set-up the string which is passed in
!	as the current search string, then work our way through the buffer in
!	the specified direction looking for the string.  If the string is found
!	the buffer position is left at the string, otherwise it will be at the
!	beginning or end depeneding on the direction.
!
! FORMAL PARAMETERS:
!
!  STRING		Pointer to the search string.
!
!  LEN			Length of the search string.
!
!  DIR			Direction of search: 0 = backward, 1 = forward.
!
! IMPLICIT INPUTS:
!
!	CUR_BUF
!	SEA_STR
!	SEA_STRLEN
!	WK_LN
!	EXCT_MATCH
!
! IMPLICIT OUTPUTS:
!
!	CC_DONE
!	CUR_BUF
!
! ROUTINE VALUE
!
!	0 = string not found
!	1 = string found
!	2 = string invalid
!
! SIDE EFFECTS:
!
!	NONE
!
!--

    BEGIN

    EXTERNAL ROUTINE
	EDT$$CHK_CC,
	EDT$$SET_SEASTR,
	EDT$$RD_NXTLN,
	EDT$$STR_CMP,			! Match strings of equal length
	EDT$$RD_PRVLN;

    EXTERNAL
	CUR_BUF : REF TBCB_BLOCK,	! Pointer to current buffer TBCB
	CC_DONE,				! control C seen flag
	SEA_STR : BLOCK [CH$ALLOCATION (64, BYTE_SIZE)],	! Last search string.
	SEA_STRLEN,				! Length of above.
	WK_LN : REF LIN_BLOCK,			! Pointer to the current line
	EXCT_MATCH;				! The type of string matching

    LOCAL
	CONTROL_C : INITIAL (0),
	SC,
	SOURCE;

!+
! Set up the new search string.
!-

    IF EDT$$SET_SEASTR (.STRING, .LEN)
    THEN
	BEGIN

	WHILE NOT .CONTROL_C DO
	    BEGIN
	    CONTROL_C = EDT$$CHK_CC ();
!+
! If seaching backward, then go back a line.
!-

	    IF ( NOT .DIR)
	    THEN

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

!+
! Get a pointer to the line.
!-
	    SOURCE = WK_LN [LIN_TEXT];
!+
! Compare at each character in the line.
!-

	    INCR I FROM .CUR_BUF [TBCB_CHAR_POS] TO 	!
		    (.WK_LN [LIN_LENGTH] - .SEA_STRLEN) DO

		IF EDT$$STR_CMP (CH$PTR (.SOURCE, .I, BYTE_SIZE),
				CH$PTR (SEA_STR,, BYTE_SIZE),
				.SEA_STRLEN, .EXCT_MATCH)
		THEN
		    BEGIN
		    CUR_BUF [TBCB_CHAR_POS] = .I + .SEA_STRLEN;
		    RETURN (1);
		    END;

!+
! If the direction is forward, then move forward a line.
!-

	    IF .DIR
	    THEN

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

	    END;
	CC_DONE = 1;
	RETURN (0);
	END;

    RETURN (2);
    END;					! of routine EDT$$FND_STR


END
ELUDOM