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Trailing-Edge - PDP-10 Archives - bb-r775c-bm_tops20_ks_upd_3 - sources/rdwrit.b36
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MODULE RDWRIT (	! Local Block I/O service for RMS
		IDENT = '2',
                ENTRY(
                      R$READ,           ! RMS $READ (Block-mode input)
                      R$WRITE,          ! RMS $WRITE (Block-mode output)
                      RMS$READ,         ! RMS Local $READ
                      RMS$WRITE,        ! RMS Local $WRITE
                      RMS$WBUCKET,      ! Put out current bucket
                      RDHANDLE          ! Handler for $READ
                      )
		) =
BEGIN
!  COPYRIGHT (C) DIGITAL EQUIPMENT CORPORATION 1982, 1985.
!  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:  DAP
!
! ABSTRACT:  Routines to transfer records or blocks of file data.
!
!
! ENVIRONMENT:  RMS, BLISSNET, XPORT, Transportable code.
!
! AUTHOR:	Andrew Nourse, CREATION DATE:  23-Apr-82
!
! MODIFIED BY:
!
! 	, : VERSION
! 02    - Put in entry points
! 01	- The beginning
!--
!
! INCLUDE FILES:
!

 LIBRARY 'RMS';                         ! RMS Definitions + XPORT
 LIBRARY 'RMSLIB';                      ! INTERNAL RMS definitions
 LIBRARY 'BLISSNET';                    ! BLISS DECNET Interface
 LIBRARY 'CONDIT';                      ! Condition handler defs
 LIBRARY 'DAP';                         ! DAP package defs
%IF %SWITCHES(TOPS20)
%THEN
 UNDECLARE %QUOTE BPT;
 LIBRARY 'BLI:MONSYM';
%FI;

!
! TABLE OF CONTENTS:
!

FORWARD ROUTINE
	R$READ,                         ! RMS $READ (Block-mode input)
        R$WRITE,                        ! RMS $WRITE (Block-mode output)
        RMS$READ,                       ! RMS Local $READ
        RMS$WRITE,                      ! RMS Local $WRITE
        NEXT_BUCKET,                    ! Find the next bucket number
        RMS$WBUCKET,                    ! Put out current bucket
        RDHANDLE;                       ! Handler for $READ

!
! STRUCTURES
!

STRUCTURE RMS_BLOCK[O,P,S]=(RMS_BLOCK+O)<P,S,0>;  ! Unsigned always
                                                  ! otherwise like BLOCK
!
! MACROS:
!

MACRO
    BUILD_LIST(BLK)[LST]=BLK[%COUNT]=LST %,

    $UTIL(FUNC)=(LOCAL ARGBLK: BLOCK[%LENGTH];
                 BIND ARGS=ARGBLK[1,0,0,0]: VECTOR;
                 BUILD_LIST(ARGS,%REMAINING);
                 ARGBLK[0,0,18,0]=FUNC;
                 ARGBLK[0,18,18,0]=1-%LENGTH;
                 $UTLINT(ARGUMENT_BLOCK=ARGBLK, ERR=RMS$SIGNAL);
                 .ARGBLK[0,0,36,0]) %;


KEYWORDMACRO
    GET_BUCKET(RAB=SAME_RAB,BUCKET,BUCKET_SIZE=1,LOCK=0,DESC)=
       (%IF NOT %IDENTICAL(RAB,SAME_RAB)
        %THEN $UTIL(U$SETENVIR,RAB);
        %FI
        $UTIL(U$GETBKT,BUCKET,BUCKET_SIZE,LOCK,DESC)) %,

    PUT_BUCKET(RAB=SAME_RAB,DESC,UPDATE=1)=
       (%IF NOT %IDENTICAL(RAB,SAME_RAB)
        %THEN $UTIL(U$SETENVIR,RAB);
        %FI
        $UTIL(U$PUTBKT,UPDATE,DESC)) %;

MACRO  FREE_BUCKET(A)=PUT_BUCKET(A,%REMAINING,UPDATE=0) %;

MACRO COPY(AFROM,ATO,LEN)=               ! Copy a block of memory
      (REGISTER BLTPTR;                  ! using BLT instruction
       BLTPTR<LH>=(AFROM);               ! FROM is source addr
       BLTPTR<RH>=(ATO);                 ! TO is destination addr
       BLT(BLTPTR,((ATO)+(LEN)-1))) %;   ! LEN is length of block

!
! EQUATED SYMBOLS:
!

LITERAL FIRST_VBN=1;

! UTLINT function codes and arguments

%(  Defined in RMSLIB

LITERAL
    U$SETENVIR=0,                ! SETENVIR(RAB)
    U$GMEM=1,                    ! GMEM(Len)
    U$GPAGE=2,                   ! GPAGE(Numberofpages)
    U$PMEM=3,                    ! PMEM(Len,Addr)
    U$PPAGE=4,                   ! PPAGE(Pagenum,Numberofpages,KillFlag)

** Functions below this require SETENVIR to be done first

    U$CHKDUP=6,                  ! CHKDUP(RecDesc_FirstSidr,BktDesc)
    U$CKEYKU=7,                  ! CKEYKU(RDPptr,RECptr)
    U$CKEYKK=%O'10',             ! CKEYKK(RDPptr,KeyStringptr)
    U$FBYRRV=%O'11',             ! FBYRRV(RecDesc_Target,BktDesc)
    U$FBYRFA=%O'12',             ! FBYRFA(RecDesc_Target,BktDesc)
    U$FNDDATA=%O'13',            ! FNDDATA(RecDesc_Keystring,BktDesc)
    U$FOLOPATH=%O'14',           ! FOLOPATH(RecDesc_Searchkey,BktDesc)
    U$GETBKT=%O'15',             ! GETBKT(Bktno,Bktsize,Lockflag,BktDesc)
    U$GETIDB=%O'16',             ! GETIDB(BktDesc)
    U$GETKDB=%O'17',             ! GETKDB(Krf)
    U$GETROOT=%O'20',            ! GETROOT(RecDesc)
    U$GTBKTPTR=%O'21',           ! GTBKTPTR(RecDesc,BktDesc_curr,BktDesc_next)
    U$MOVEKEY=%O'22',            ! MOVEKEY(RecPtr,KeybufPtr)
    U$PATH=%O'23',               ! PATH()
    U$PUTBKT=%O'24',             ! PUTBKT(UpdateFlag,BktDesc)
    U$PUTSIDR=%O'25';            ! PUTSIDR(RecDesc)
)%

!
! OWN STORAGE:
!


!
! EXTERNAL REFERENCES:
!
EXTERNAL ROUTINE
                DAP$GET,
                DAP$PUT,
                DAP$GET_MESSAGE,
                DAP$PUT_MESSAGE,
                DAP$GET_STRING,
                DAP$GET_STATUS,
                DAP$PUT_STRING,
                DAP$PUT_CONTROL,
                DAP$GET_ACK,
                DAP$ERROR_DAP_RMS,
                RMS$SIGNAL,
                DAP$HANDLE;             ! Condition handler
GLOBAL ROUTINE R$READ (RAB,ERR)  =	! Get a bucket from a file

!++
! FUNCTIONAL DESCRIPTION:
!
!       Get a bucket from an open file.
!       Use RMS if file is local, DAP (via DAP$GET) if remote.
!
! FORMAL PARAMETERS:
!
!       RAB: A RAB as defined by RMS
!       ERR: Address of error routine
!
! IMPLICIT INPUTS:
!
!	NONE
!
! IMPLICIT OUTPUTS:
!
!	NONE
!
! COMPLETION CODES:
!
!	NONE
!
! SIDE EFFECTS:
!
!	NONE
!
!--

    BEGIN
    MAP RAB: REF $RAB_DECL;
    BIND FAB=.RAB[RAB$A_FAB]: $FAB_DECL;
    LOCAL V;

    V=(IF .FAB[FAB$V_REMOTE]
       THEN DAP$GET(RAB[$],.ERR)
       ELSE RMS$READ(RAB[$],.ERR));

    .V
    END;			!End of R$READ
GLOBAL ROUTINE R$WRITE (RAB,ERR) =	! Put a page

!++
! FUNCTIONAL DESCRIPTION:
!
!       Put a page to an open file.
!       Use RMS if file is local, DAP (via DAP$PUT) if remote.
!
! FORMAL PARAMETERS:
!
!       RAB: A RAB as defined by RMS
!       ERR: Address of error routine
!
! COMPLETION CODES:
!
!	Standard RMS codes
!
! SIDE EFFECTS:
!
!	NONE
!--

    BEGIN
    MAP RAB: REF $RAB_DECL;
    BIND FAB=.RAB[RAB$A_FAB]: $FAB_DECL;
    IF .FAB[FAB$V_REMOTE]
    THEN DAP$PUT(RAB[$],.ERR)
    ELSE RMS$WRITE(RAB[$],.ERR)
    END;			!End of R$WRITE
GLOBAL ROUTINE RMS$READ (URAB,ERR)  =	! Get a page from a file

!++
! FUNCTIONAL DESCRIPTION:
!
!       Get a page from an open local file.
!
! FORMAL PARAMETERS:
!
!       URAB: A RAB as defined by RMS
!       ERR: Address of error routine
!
! IMPLICIT INPUTS:
!
!	NONE
!
! IMPLICIT OUTPUTS:
!
!	NONE
!
! COMPLETION CODES:
!
!	NONE
!
! SIDE EFFECTS:
!
!	NONE
!
!--

    BEGIN
    BIND RAB=.URAB: $RAB_DECL;
    BIND RST=.RAB[RAB$A_ISI]: RMS_BLOCK;
    BIND CBKD=RST[RSTCBKD1]: RMS_BLOCK;
    BIND CBFD=.CBKD[BKDBFDADR]: RMS_BLOCK;
    LOCAL CRAB: REF $RAB_DECL VOLATILE;
    LOCAL CERR: VOLATILE;

    ENABLE RDHANDLE(CRAB,CERR);         ! Handle page-not-found, in particular

    CRAB=RAB;                          ! Copy for handler
    CERR=.ERR;                          ! 

    !Free the buffer if necessary
    IF CBFD NEQ 0                       ! Is there any buffer descriptor?
    THEN
        BEGIN
        IF .CBFD[BFDUSECOUNT] GTR 0           ! Is a bucket in the buffer?
        THEN FREE_BUCKET(RAB=RAB, DESC=CBKD); ! Yes. free it.
        END;

    RAB[RAB$G_RFA]=.RAB[RAB$G_BKT];     ! Assume we get what we asked for
                                        ! (If not, handler will fix it)

    ! Special case for VBN 0, which is the FDB of the file
    IF .RAB[RAB$G_RFA] EQL 0
    THEN
        BEGIN
        %IF %SWITCHES(TOPS20)
        %THEN

        LINKAGE JSYS_3=JSYS(REGISTER=1,REGISTER=2,REGISTER=3): SKIP(0);
        BIND ROUTINE GTFDB__=GTFDB_: JSYS_3;
        BIND FAB=.RAB[RAB$A_FAB]: $FAB_DECL;
        RAB[RAB$H_RSZ]=$FBLEN;          ! Length of FDB

        GTFDB__(.FAB[FAB$H_JFN],$FBLEN^18,.RAB[RAB$A_UBF]);

        %ELSE %ERROR('Not implemented for TOPS-10')
        %FI

        RETURN RMS$_NORMAL
        END;

    ! Get the requested page of the file
    GET_BUCKET(RAB=RAB, DESC=CBKD, BUCKET=(.RAB[RAB$G_RFA]-FIRST_VBN));

    SELECT .RAB[RAB$Z_RAC] OF
    SET
    [RAB$K_RAC_BLK, RAB$K_RAC_BFT]:     ! If block mode,
        BEGIN                           ! user wants the bucket itself
        RAB[RAB$H_RSZ]=PAGESIZE*.CBKD[BKDBKTSIZE];
        IF .RAB[RAB$V_ROP_LOC]
        THEN RAB[RAB$A_RBF]=.CBKD[BKDBKTADR]        !Point RBF at bucket itself
        ELSE
            BEGIN
            RAB[RAB$A_RBF]=.RAB[RAB$A_UBF];         !Point RBF at user's buffer
            COPY(.CBKD[BKDBKTADR],.RAB[RAB$A_RBF],.RAB[RAB$H_RSZ]);
            END;
        END;
    TES;

    RMS$_NORMAL
    END;                                !End of RMS$READ
GLOBAL ROUTINE RMS$WRITE (URAB,ERR) =	! Put a page

!++
! FUNCTIONAL DESCRIPTION:
!
!       Put a page to an open local file.
!
! FORMAL PARAMETERS:
!
!       URAB: A RAB as defined by RMS
!       ERR: Address of error routine
!
! COMPLETION CODES:
!
!	NONE
!
! SIDE EFFECTS:
!
!	NONE
!--

    BEGIN
    BIND RAB=.URAB: $RAB_DECL;
    BIND RST=.RAB[RAB$A_ISI]: RMS_BLOCK;
    BIND CBKD=RST[RSTCBKD1]: RMS_BLOCK;
    BIND CBFD=.CBKD[BKDBFDADR]: RMS_BLOCK;
    LOCAL CRAB: REF $RAB_DECL VOLATILE;
    LOCAL CERR: VOLATILE;

    ENABLE RDHANDLE(CRAB,CERR);         ! Handle page-not-found, in particular

    CRAB=RAB;                           ! Copy for handler
    CERR=.ERR;                          ! 

    !Free the buffer if necessary
    IF CBFD NEQ 0                       ! Is there any buffer descriptor?
    THEN
        BEGIN
        IF .CBFD[BFDUSECOUNT] GTR 0           ! Is a bucket in the buffer?
        THEN FREE_BUCKET(RAB=RAB, DESC=CBKD); ! Yes. free it.
        END;

    RAB[RAB$G_RFA]=.RAB[RAB$G_BKT];     ! Assume we got what we wanted

    ! Special case for VBN 0, which is the FDB of the file
    ! Note that words in the FDB
    !  that corrrespond to zero words in the buffer are not changed!
    IF .RAB[RAB$G_RFA] EQL 0
    THEN
        BEGIN
        %IF %SWITCHES(TOPS20)
        %THEN
        LINKAGE JSYS_3E=JSYS(REGISTER=1,REGISTER=2,REGISTER=3): SKIP(-1);
        BIND FAB=.RAB[RAB$A_FAB]: $FAB_DECL;
        BIND ROUTINE CHFDB__=CHFDB_: JSYS_3E;
        OWN FDB_MASK:VECTOR[$FBLEN]  ! Mask of what CHFDB can change
                     PRESET([$FBCTL]=FB_TMP+FB_PRM+FB_DEL+FB_NOD+FB_INV+FB_FCF,
                                     ! Temporary, Permanent, Deleted, No-dump,
                                     ! Invisible, File Class (RMS/not-RMS)
                            [$FBPRT]=%O'777777',! Protection of file
                            [$FBBYV]=FB_RET+FB_BSZ+FB_MOD, ! GenRetent,bsz,mode
                            [$FBSIZ]=-1,        ! Size of file in bytes
                            [$FBCRV]=-1,        ! Creation Date/Time
                            [$FBWRT]=-1,        ! Last user write dtm
                            [$FBREF]=-1,        ! Last user read dtm
                            [$FBUSW]=-1         ! User settable word
                            );
                            
        LOCAL PTR: REF VECTOR;
        LOCAL LEN;

        PTR=.RAB[RAB$A_RBF];            ! Pointer to 'record'

        INCR I FROM 0 TO MIN(.RAB[RAB$H_RSZ],$FBLEN)-1
        DO  BEGIN
            IF (.FDB_MASK[.I] NEQ 0) ! If anything to change here
            AND (.PTR[.I] NEQ 0)     ! and we provided something there
            THEN CHFDB__(CF_NUD+(.I^18)+.FAB[FAB$H_JFN],.FDB_MASK[.I],.PTR[.I])
            END;

        %ELSE %ERROR('Not implemented for TOPS-10')
        %FI
        RETURN RMS$_NORMAL
        END;

    GET_BUCKET(RAB=RAB, DESC=CBKD, BUCKET=(.RAB[RAB$G_RFA]-FIRST_VBN)); !Get it
    COPY(.RAB[RAB$A_RBF], .CBKD[BKDBKTADR], .RAB[RAB$H_RSZ]); ! Copy into it
    PUT_BUCKET(UPDATE=1, DESC=CBKD);                          ! Write it out
    RMS$_NORMAL
    END;			!End of RMS$WRITE
ROUTINE NEXT_BUCKET(URAB)=
!++
! FUNCTIONAL DESCRIPTION:
!
!    Find next bucket of file
!
! FORMAL PARAMETERS:
!
!    URAB: Address of RAB
!
! RETURNED VALUE:
!
!    Next bucket (page) number
!
! SIDE EFFECTS:
!
!   If no next page, RMS$_EOF is signalled
!   All other errors signal as RMS$_BUG
!--
    BEGIN
    LINKAGE JSYS1E=JSYS(REGISTER=1;REGISTER=1): SKIP(-1);
    BIND ROUTINE FFUFP__=FFUFP_: JSYS1E;
    ! Find next file page JSYS
    BIND RAB=.URAB: $RAB_DECL;
    BIND FAB=.RAB[RAB$A_FAB]: $FAB_DECL;
    LOCAL NEXTB;

    IF FFUFP__(((.FAB[FAB$H_JFN])^18)+(.RAB[RAB$G_RFA]-FIRST_VBN);NEXTB)
    THEN
        BEGIN
        RAB[RAB$G_BKT]=RAB[RAB$G_RFA]=.NEXTB<RH>+FIRST_VBN;
        RETURN RMS$_NORMAL
        END
    ELSE                                ! If no next page
        BEGIN                           ! probably end of file
        RAB[RAB$H_STS]=(IF .NEXTB EQL FFUFX3    ! Is it end of file?
                        THEN RMS$_EOF
                        ELSE RMS$_BUG);
        RAB[RAB$H_STV]=.NEXTB;          ! Secondary status is TOPS-20 code
                  
        SIGNAL(.RAB[RAB$H_STS],.NEXTB,RAB[$],RMS$K_FIND_VALUE)    ! oops
        END
    END;
GLOBAL ROUTINE RMS$WBUCKET (URAB,ERR) =	! Put current bucket

!++
! FUNCTIONAL DESCRIPTION:
!
!       Put current bucket to an open local file.
!
! FORMAL PARAMETERS:
!
!       URAB: A RAB or an RST as defined by RMS
!       ERR: Address of error routine
!
! COMPLETION CODES:
!
!	NONE
!
! SIDE EFFECTS:
!
!	NONE
!--

    BEGIN
    BIND RAB=.URAB: $RAB_DECL;
    BIND RST=(IF .RAB[RAB$H_BID] EQL RAB$K_BID
              THEN .RAB[RAB$A_ISI]
              ELSE .URAB):  RMS_BLOCK;
    BIND CBKD=RST[RSTCBKD1]: RMS_BLOCK;
    BIND CBFD=.CBKD[BKDBFDADR]: RMS_BLOCK;

    IF CBFD NEQ 0                       ! Is there any buffer descriptor?
    THEN
        BEGIN
        IF .CBFD[BFDUSECOUNT] GTR 0             ! Is a bucket in the buffer?
        THEN PUT_BUCKET(UPDATE=1, DESC=CBKD);   ! Write it out
        END;
    RMS$_NORMAL          ! Good return
    END;			!End of RMS$WBUCKET
GLOBAL ROUTINE RDHANDLE (SIGNAL_ARGS,MECH_ARGS,ENABLE_ARGS) =
!++
! FUNCTIONAL DESCRIPTION:
!
!       Condition handler for RMS$READ and RMS$WRITE
!
! FORMAL PARAMETERS:
!
!	SIGNAL_ARGS: addr of vector of SIGNAL arguments,
!       MECH_ARGS: not used,
!       ENABLE_ARGS: args passed when this handler was established
!                  [1]: Address of RAB
!                  [2]: Error routine
!
! COMPLETION CODES:
!
!	0: Resignal, 1: Continue
!
! SIDE EFFECTS:
!
!   RMS$_UDF is changed to RMS$_RNF
!   because this can only occur if the page doesn't exist
!--

    BEGIN
    MAP SIGNAL_ARGS: REF VECTOR,
        MECH_ARGS: REF VECTOR,
        ENABLE_ARGS: REF VECTOR;

    LOCAL SEVERITY;

    BIND ROUTINE $$ERRRTN=..ENABLE_ARGS[2]: RMS_ERCAL;       ! Error routine
    BIND RAB=..ENABLE_ARGS[1]: $RAB_DECL;

    IF RAB EQL 0 THEN RETURN SS$_RESIGNAL;      ! Not set up

    SEVERITY=.(SIGNAL_ARGS[1])<0,3>;

    SELECT .SIGNAL_ARGS[1] OF
           SET
           [SS$_UNWIND]: RETURN SS$_CONTINUE;
           [RMS$_UDF]: BEGIN
                       IF (.RAB[RAB$Z_RAC] EQL RAB$K_RAC_BFT) ! Blk mode xfer
                       OR (.RAB[RAB$Z_RAC] EQL RAB$K_RAC_SEQ) ! or Sequential
                       OR (.RAB[RAB$Z_RAC] EQL RAB$K_RAC_TRA) ! or transfer
                       OR .RAB[RAB$V_ROP_KGE]
                       THEN
                           BEGIN
                           NEXT_BUCKET(RAB);  ! Find next
                           RMS$READ(RAB,$$ERRRTN); ! And read it
                           SETUNWIND();
                           RETURN MECH_ARGS[1]=.RAB[RAB$H_STS] ! Return status
                           END;  ! Unwind
                             
                       SIGNAL_ARGS[1]=RMS$_RNF; ! GET_BUCKET returns this 
                       END;                     ! if the page doesn't exist.
                                                ! We want Record-not-found
           [RMS$K_ERR_MIN TO RMS$K_ERR_MIN+%O'7777']: ! RMS-20 predates
                        (SEVERITY=STS$K_ERROR;        ! the standard
                         RAB[RAB$H_STS]=.SIGNAL_ARGS[1]);
           [RMS$K_SUC_MIN TO RMS$K_SUC_MIN+%O'17']:   !
                        (SEVERITY=STS$K_NORMAL;       ! 
                         RAB[RAB$H_STS]=.SIGNAL_ARGS[1]);
           TES;

    CASE .SEVERITY FROM 0 TO 7 OF
         SET
         [STS$K_ERROR, STS$K_WARNING]:  
                BEGIN
                $$ERROR(OPEN,RAB);              !? Should get operation too
                SETUNWIND();
                END;
         [STS$K_NORMAL, STS$K_INFO]: RETURN STS$K_NORMAL;
         [STS$K_FATAL,INRANGE]: ;
         TES;

    STS$K_RESIGNAL
    END;			!End of RDHANDLE
END				!End of module
ELUDOM