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Trailing-Edge - PDP-10 Archives - bb-h138e-bm_tops20_v6_1_distr - 6-1-sources/reajoutex.bli
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 %TITLE 'REAJOUTEX - read a text record from the journal file'
MODULE REAJOUTEX (				! Read a text record from the journal file
		IDENT = '3-004'			! File: REAJOUTEX.BLI Edit: CJG3004
		) =
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:
!
!	Read a text record from the journal file.  All other records are
!	processed in this module.
!
! ENVIRONMENT:	Runs at any access mode - AST reentrant
!
! AUTHOR: John Sauter, CREATION DATE: June 22, 1981
!
! MODIFIED BY:
!
! 1-001	- Original.  JBS 22-Jun-1981
! 1-002	- Change the format of the journal file to make it compatible
!	   with EDT v2.0.  JBS 07-Jul-1981
! 1-003	- Fix the module name and title.  JBS 07-Aug-1981
! 1-004	- Read from the journal file, not the command file.  JBS 16-Aug-1981
! 1-005	- Handle control C records.  JBS 21-Dec-1981
! 1-006	- Debug control C record handling.  JBS 24-Dec-1981
! 1-007	- Revise control C data names.  JBS 29-Dec-1981
! 1-008	- Use two words for control C counters.
! 1-009 - Convert to use EDT$FILEIO. STS 18-Jan-1982
! 1-010 - Pass RHB descriptor to fileio. STS 25-Jan-1982
! 1-011 - Deallocate dynamic descriptors. STS 10-Feb-1982
! 1-012 - Add literals for callable EDT. STS 10-Mar-1982
! 1-013	- Remove reference to EDT$$RD_IFI.  JBS 15-Mar-1982
! 1-014	- Allow 0-length records.  JBS 01-Apr-1982
! 1-015	- Use symbols instead of magic numbers when journaling control C.  JBS 24-May-1982
! 3-001 - Don't need RHB code on TOPS20. CJG 19-Apr-1983
! 3-002 - Remove call to EDT$$CALLFIO. CJG 10-Jun-1983
! 3-003 - Fix journal counters for TOPS-20 operation. CJG 17-Jun-1983
! 3-004 - Modify ASSERT macro to include error code. CJG 30-Jan-1984
!--

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

REQUIRE 'EDTSRC:TRAROUNAM';

FORWARD ROUTINE
    EDT$$RD_JOUTXT;

!
! INCLUDE FILES:
!

REQUIRE 'EDTSRC:EDTREQ';

REQUIRE 'SYS:JSYS';

!
! MACROS:
!
!	NONE
!
! EQUATED SYMBOLS:
!

EXTERNAL LITERAL
    EDT$K_GET,
    EDT$K_JOURNAL_FILE;

!
! OWN STORAGE:
!
!	NONE
!
! EXTERNAL REFERENCES:
!
!	In the routine
%SBTTL 'EDT$$RD_JOUTXT  - read a text record from the journal file'

GLOBAL ROUTINE EDT$$RD_JOUTXT (			! Read a text record from the journal file
    INPUT_BUFFER, 				! Address of input buffer
    INPUT_BUFFER_LEN				! Length of record read
    ) =

!++
! FUNCTIONAL DESCRIPTION:
!
!	Read records from the journal file until we find a text record.  Return that
!	record to the caller.  The other kind of record, the control C record, is
!	processed in this routine by storing its value in CC_CNT2.
!
! FORMAL PARAMETERS:
!
!  INPUT_BUFFER			The address of the input buffer.  The text record is
!				stored in this buffer.
!  INPUT_BUFFER_LEN		The length of the text record read is stored here.
!
! IMPLICIT INPUTS:
!
!	RCOV_MOD
!	CC_CNT1
!	CC_CNT2
!	CC_FLAG
!
! IMPLICIT OUTPUTS:
!
!	CC_CNT1
!	CC_CNT2
!	CC_FLAG
!
! ROUTINE VALUE:
!
!	1 = text record read, 0 = error from reading file
!
! SIDE EFFECTS:
!
!	NONE
!
!--

    BEGIN

    EXTERNAL ROUTINE
	EDT$FILEIO;

    EXTERNAL
	CC_CNT1,			! Counts number of "no control C's" returned.
	CC_CNT2,			! Loaded with value from control C record
	CC_FLAG,			! 1 = a control C record was read or written
	RCOV_MOD;			! 1 = /RECOVER

    LOCAL
	DUM,
	FILE_DESC : BLOCK [1],
	INPUT_FILE_STATUS,
	LOCAL_INPUT_BUFFER : REF VECTOR,
	LOCAL_INPUT_BUFFER_LEN;


    FILE_DESC [DSC$A_POINTER] = 0;
    FILE_DESC [DSC$W_LENGTH] = 0;
!+
! This routine is only called if we are recovering.
!-
    ASSERT (13, .RCOV_MOD);
!+
! Read from the journal file until we get a text record.
!-

    DO
	BEGIN
	INPUT_FILE_STATUS = EDT$FILEIO (EDT$K_GET, EDT$K_JOURNAL_FILE, FILE_DESC);
	LOCAL_INPUT_BUFFER = .FILE_DESC [DSC$A_POINTER];
	LOCAL_INPUT_BUFFER_LEN = .FILE_DESC [DSC$W_LENGTH];

	IF (.INPUT_FILE_STATUS NEQ 0)
	THEN
	    BEGIN

	    IF (.LOCAL_INPUT_BUFFER_LEN EQL 0)
	    THEN
		BEGIN
!+
! We have a 0-length record.  Treat it as a text record.
!-
		.INPUT_BUFFER_LEN = 0;
		RETURN (.INPUT_FILE_STATUS);
		END
	    ELSE
		BEGIN

		IF (CH$RCHAR (CH$PTR (.LOCAL_INPUT_BUFFER,, BYTE_SIZE)) NEQ JOU_REC_ESC)
		THEN
		    BEGIN
!+
! We have a text record, move the record to the caller's buffer and return.
!-
		    ASSERT (20, .LOCAL_INPUT_BUFFER_LEN LEQ 256);
		    CH$MOVE (.LOCAL_INPUT_BUFFER_LEN,
			CH$PTR (.LOCAL_INPUT_BUFFER,, BYTE_SIZE),
			CH$PTR (.INPUT_BUFFER,, BYTE_SIZE));
		    .INPUT_BUFFER_LEN = .LOCAL_INPUT_BUFFER_LEN;
		    RETURN (.INPUT_FILE_STATUS);
		    END
		ELSE
		    BEGIN
!+
! This must be a control C record.  Arrange for a simulated control C trap
! after the specified number of tests of the control C flag.
!-
		    ASSERT (20, CH$RCHAR (CH$PTR (.LOCAL_INPUT_BUFFER,, BYTE_SIZE))
			    EQL JOU_REC_ESC);
		    ASSERT (20, CH$RCHAR (CH$PTR (.LOCAL_INPUT_BUFFER, 1, BYTE_SIZE))
			    EQL CC_REC_FLAG);
		    ASSERT (20, (.LOCAL_INPUT_BUFFER_LEN) EQL CC_REC_SIZE);
		    ASSERT (20, .CC_CNT1 EQL 0);
		    ASSERT (20, .CC_CNT2 EQL 0);
		    ASSERT (20, .CC_FLAG EQL 0);
		    _NIN (CH$PTR (.LOCAL_INPUT_BUFFER, 2, BYTE_SIZE), 10; DUM, CC_CNT2);
		    ASSERT (20, .CC_CNT2 GEQ 0);
		    ASSERT (20, .CC_CNT2 LEQ CC_CTR_MAX);
		    CC_FLAG = 1;
		    END;

		END;

	    END
	ELSE
!+
! No more records in the journal file, return failure.
!-
	    BEGIN
	    RETURN (.INPUT_FILE_STATUS);
	    END;

	END
    UNTIL 0;

!+
! Control cannot reach this point.
!-
    ASSERT (0, 0);
    RETURN (0);
    END;					! of routine EDT$$RD_JOUTXT


END
ELUDOM