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bb-h138e-bm_tops20_v6_1_distr
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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