Topspeed_JPI/TS-V3/MODBASE/HANDLEIO.LST

Listing:

    1  IMPLEMENTATION MODULE HandleIO;
    2  (*
    3   *  REPERTOIRE
    4   *  Release 1.6
    5   *  By Charles Bradford and Cole Brecheen
    6   *  (c) Copyright 1985-1992 PMI
    7   *  Green Bay, Wisconsin
    8   *  All rights reserved
    9   *  (414) 468-6040
   10   *
   11   *  $Header:   D:/logfiles/mods/handleio.mov   1.5   17 Mar 1991 17:54:52   coleb  $
   12   *
   13   *)
   14  
   15  
   16  (*EntryDiag:
   17  IMPORT Diagnostics;
   18  :EntryDiag*)
   19  
   20  IMPORT FAPI;
   21  IMPORT ByteFiddler;
   22  IMPORT Drectory;
   23  IMPORT EnvironUtils;
   24  IMPORT ErrorManager;
   25  IMPORT LowLevel;
   26  IMPORT M2Strings;
   27  IMPORT Numbers;
   28  IMPORT NumTypes;
   29  IMPORT StrEdit;
   30  IMPORT StringIO;
   31  IMPORT SYSTEM;
   32  IMPORT VStorage;
   33  
   34  VAR
   35    Initialized : BOOLEAN;
   36  
   37    PROCEDURE Init();
   38      BEGIN
   39        IF Initialized THEN
   40          RETURN;
   41        ELSE
   42          Initialized := TRUE;
   43        END;
   44  (*EntryDiag:
   45        Diagnostics.Init();
   46  :EntryDiag*)
   47  
   48        ByteFiddler.Init();
*****        ^ not supported yet
*****                    ^ not supported yet
*****                         ^ not supported yet
   49        Drectory.Init();
*****        ^ not supported yet
*****                 ^ not supported yet
*****                      ^ not supported yet
   50        EnvironUtils.Init();
*****        ^ not supported yet
*****                     ^ not supported yet
*****                          ^ not supported yet
   51        ErrorManager.Init();
*****        ^ not supported yet
*****                     ^ not supported yet
*****                          ^ not supported yet
   52        LowLevel.Init();
*****        ^ not supported yet
*****                 ^ not supported yet
*****                      ^ not supported yet
   53        M2Strings.Init();
*****        ^ not supported yet
*****                  ^ not supported yet
*****                       ^ not supported yet
   54        Numbers.Init();
*****        ^ not supported yet
*****                ^ not supported yet
*****                     ^ not supported yet
   55        NumTypes.Init();
*****        ^ not supported yet
*****                 ^ not supported yet
*****                      ^ not supported yet
   56        StrEdit.Init();
*****        ^ not supported yet
*****                ^ not supported yet
*****                     ^ not supported yet
   57        StringIO.Init();
*****        ^ not supported yet
*****                 ^ not supported yet
*****                      ^ not supported yet
   58        VStorage.Init();
*****        ^ not supported yet
*****                 ^ not supported yet
*****                      ^ not supported yet
   59  (*EntryDiag:
   60        Diagnostics.diagS( 'Entering HandleIO', '' );
   61  :EntryDiag*)
   62        DefaultFileAttribute := BITSET{};
*****        ^ undeclared identifier
*****                                ^ undeclared identifier
   63          (*Normal--not system, hidden, or ReadOnly.*)
   64        DefaultFileMode := BITSET{ 6, 1 };
   65          (* Open for Read/Write access; allow all access requests from other
   66             processes. *)
   67  (*
   68        DefaultFileMode := BITSET{ 5, 1 };
   69      (* Open for Read/Write access; deny write access requests by
   70         other processes, but allow read access requests. Commented out
   71         because it seems always to cause the CreateFile operation to
   72         fail with an error 32, File Sharing Violation. Doesn't interfere
   73         with OpenFile operation. *)
   74  *)
   75  (*EntryDiag:
   76         Diagnostics.diagS( 'Exiting HandleIO', '' );
   77  :EntryDiag*)
   78      END Init;
   79  
   80  
   81    PROCEDURE OpenFile(VAR FileHandle : CARDINAL; fname : ARRAY OF CHAR) :
   82        CARDINAL;
   83      VAR
   84        ErrorReturn: CARDINAL;
   85        LongZero, Reserved: LONGINT;
   86        OpenFlag: BITSET;
   87        ActionTaken: CARDINAL;
   88        filen : ARRAY [0..79] OF CHAR;
   89      BEGIN
   90        StrEdit.AssignStr(fname, filen);
   91        FileHandle := 0;
   92  
   93        OpenFlag := {0};  (* Open if it does exist; fail if it doesn't *)
   94        LongZero := VAL(LONGINT, 0);
   95        Reserved := VAL(LONGINT, 0);
   96        ErrorReturn := FAPI.DOSOPEN( SYSTEM.ADR(filen),
   97            SYSTEM.ADR(FileHandle), SYSTEM.ADR(ActionTaken),
   98            LongZero, FAPI.FILE_NORMAL,
   99            FAPI.USHORT(OpenFlag), FAPI.USHORT(DefaultFileMode), Reserved );
  100        RETURN ErrorReturn;
  101      END OpenFile;
  102  
  103  
  104    PROCEDURE FindFile(VAR FileHandle : CARDINAL;
  105                       VAR fname: ARRAY OF CHAR;
  106                       EnvironVariable : ARRAY OF CHAR) : CARDINAL;
  107      VAR
  108        SavedMessage : CARDINAL;
  109        name,PathName, ProgName, prefix, PathStr : ARRAY [0..128] OF CHAR;
  110        DriveLetter: CHAR;
  111  
  112      PROCEDURE SplitFirstDir(VAR str1, str2 : ARRAY OF CHAR);
  113        VAR
  114          lngth1, ndx : CARDINAL;
  115        BEGIN
  116          StrEdit.CutLeadingChars(' ', str1);
  117          lngth1 := M2Strings.Length(str1);
  118          ndx := M2Strings.Pos(';', str1);
  119          IF (lngth1=0) OR (ndx=0) THEN
  120            IF ndx=0 THEN
  121              M2Strings.Delete(str1, 0, 1);
  122            (*If str1 starts with a semicolon, get rid of it so it
  123              won't mess us up next time.*)
  124            END;
  125            StrEdit.SetLength(str2, 0);
  126            RETURN;
  127          END;
  128          IF ndx>HIGH(str1) THEN
  129            ndx := HIGH(str1)-1;
  130          (*We always want ndx to point to the last real character
  131            of the first directory name in str1.  If there's only
  132            one directory name in str1--i.e., if there's no
  133            semicolon in str1--ndx should point to the last
  134            character of str1.  If there is a semicolon in str1,
  135            ndx should point to the character immediately preceding
  136            it.*)
  137          ELSE
  138            DEC(ndx);
  139          END;
  140          M2Strings.Copy(str1, 0, ndx+1, str2);
  141          StrEdit.CutTrailingChars(' ', str2);
  142          IF (str2[M2Strings.Length(str2)-1]#'\') THEN
  143            StrEdit.Append(str2, '\');
  144          END;
  145          M2Strings.Delete(str1, 0, ndx+1);
  146        END SplitFirstDir;
  147  
  148      PROCEDURE DirRemoved(VAR FileName : ARRAY OF CHAR) : BOOLEAN;
  149        VAR
  150          SlashSpot, ColonSpot : CARDINAL;
  151          tmp : BOOLEAN;
  152        BEGIN
  153          tmp := FALSE;
  154          SlashSpot := M2Strings.Pos('\', FileName);
  155          WHILE SlashSpot<=HIGH(FileName) DO
  156            tmp := TRUE;
  157            M2Strings.Delete(FileName, 0, SlashSpot+1);
  158            SlashSpot := M2Strings.Pos('\', FileName);
  159          END;
  160          ColonSpot := M2Strings.Pos(':', FileName);
  161          IF ColonSpot<=HIGH(FileName) THEN
  162            M2Strings.Delete(FileName, 0, ColonSpot+1);
  163            tmp := FALSE;
  164          END;
  165          RETURN (tmp);
  166        END DirRemoved;
  167  
  168      BEGIN
  169        M2Strings.Assign(fname,name);
  170        SavedMessage := OpenFile(FileHandle, fname);
  171          (*First we look for the file in any directory specified in
  172            fname.  If no directory is specified in fname, we'll be
  173            looking in the current directory of the current drive at
  174            this step.*)
  175        IF SavedMessage # StringIO.NoError THEN
  176          (*First check the directory in which the program is
  177            stored.*)
  178          EnvironUtils.GetExeName(PathStr);
  179          Drectory.GetDrivePathAndName( PathStr, DriveLetter,
  180              PathName, ProgName );
  181          M2Strings.Insert( ':', PathName, 0 );
  182          M2Strings.Insert( DriveLetter, PathName, 0 );
  183          IF DirRemoved(fname) THEN
  184            (*We do this to strip the old prefix out of fname.*)
  185          END;
  186          StrEdit.Append( PathName, fname );
  187          SavedMessage := OpenFile(FileHandle, PathName);
  188          IF (SavedMessage#StringIO.NoError) THEN
  189            (* We do this to make sure we search the current
  190               directory before moving on to a path search.*)
  191            SavedMessage := OpenFile(FileHandle, fname);
  192          END;
  193          EnvironUtils.ReadEnvironment(EnvironVariable, PathStr);
  194        END;
  195        WHILE (SavedMessage#StringIO.NoError) AND
  196              (M2Strings.Length(PathStr)>0) DO
  197          SplitFirstDir(PathStr, prefix);
  198          M2Strings.Assign(name,fname);
  199          M2Strings.Insert(prefix, fname, 0);
  200          SavedMessage := OpenFile(FileHandle, fname);
  201          IF SavedMessage = StringIO.NoError THEN
  202            RETURN (SavedMessage);
  203          ELSE
  204            IF DirRemoved(fname) THEN
  205            (*We do this to strip the old prefix out of fname.*)
  206            END;
  207          END;
  208        END;
  209        RETURN (SavedMessage);
  210      END FindFile;
  211  
  212  
  213    PROCEDURE CreateFile( VAR FileHandle : CARDINAL; fname :
  214        ARRAY OF CHAR ) : CARDINAL;
  215      VAR
  216        ErrorReturn, ActionTaken: CARDINAL;
  217        OpenFlag: BITSET;
  218        Reserved: LONGINT;
  219        filen : ARRAY [0..79] OF CHAR;
  220      BEGIN
  221        StrEdit.AssignStr(fname, filen);
  222        FileHandle := 0;
  223        OpenFlag := {1, 4};
  224          (* create if the file does not exist; truncate if it does exist *)
  225        Reserved := VAL(LONGINT, 0);
  226        ErrorReturn := FAPI.DOSOPEN( SYSTEM.ADR(filen),
  227            SYSTEM.ADR(FileHandle), SYSTEM.ADR(ActionTaken), VAL(LONGINT, 0),
  228            FAPI.FILE_NORMAL, FAPI.USHORT(OpenFlag),
  229            FAPI.USHORT(DefaultFileMode), Reserved );
  230        RETURN ErrorReturn;
  231      END CreateFile;
  232  
  233  
  234    PROCEDURE CreateUniqueFile(VAR FileHandle : CARDINAL; VAR fname :
  235      ARRAY OF CHAR) : CARDINAL;
  236      VAR
  237        filen, TryName : ARRAY [0..79] OF CHAR;
  238       h,m,s,hs: CARDINAL;
  239      BEGIN
  240        (*RETURN ( StringIO.BadFunction); *)
  241        (* not implimented in OS/2 *)
  242        IF( fname[0]#0C) AND (fname[M2Strings.Length(fname)-1]#'\')
  243        THEN (* if not nil string make sure end with \ *)
  244          StrEdit.Append(fname,'\');
  245        END;
  246        StrEdit.AssignStr(fname, filen);
  247        IF TRUE (*MajorVersion < 3*) THEN
  248          REPEAT
  249            EnvironUtils.GetTime( h, m, s, hs, TryName );
  250            StrEdit.DeleteChar(':', TryName );
  251            StrEdit.DeleteChar(' ', TryName );
  252            StrEdit.Append( TryName, '13852940' );
  253            StrEdit.SetLength( TryName, 12);
  254            TryName[8] := '.';
  255            M2Strings.Insert( fname, TryName, 0 );
  256          UNTIL NOT FileExists( TryName );
  257          StrEdit.AssignStr( TryName, filen );
  258          StrEdit.AssignStr( TryName, fname );
  259            (* added 10 July 87 *)
  260          RETURN CreateFile( FileHandle, fname );
  261            (* changed from filen 10 July 87 *)
  262        END;
  263        RETURN StringIO.NoError;
  264  
  265      END CreateUniqueFile;
  266  
  267  
  268    PROCEDURE CloseHandle(FileHandle : CARDINAL) : CARDINAL;
  269      VAR
  270        ErrorReturn: CARDINAL;
  271      BEGIN
  272        ErrorReturn := FAPI.DOSCLOSE(FileHandle);
  273        IF ErrorReturn # 0 THEN
  274          ErrorManager.WarnNumber( 'DOSCLOSE error', ErrorReturn );
  275        END;
  276        RETURN ErrorReturn;
  277      END CloseHandle;
  278  
  279  
  280    PROCEDURE GetFilePtr(FileHandle : CARDINAL) : LONGINT;
  281       (*Returns the current DOS position in the file
  282         identified by FileHandle.*)
  283      VAR
  284        CurrentPTR: LONGINT;
  285        ErrorReturn: CARDINAL;
  286      BEGIN
  287        ErrorReturn := FAPI.DOSCHGFILEPTR( FileHandle, VAL(LONGINT, 0),
  288            1, SYSTEM.ADR(CurrentPTR));
  289        IF ErrorReturn # 0 THEN
  290          ErrorManager.WarnNumber("DosChgFilePtr error", ErrorReturn );
  291        END;
  292        RETURN CurrentPTR;
  293      END GetFilePtr;
  294  
  295  
  296    PROCEDURE FileLengthWithMove(FileHandle : CARDINAL) : LONGINT;
  297     (*Returns the number of bytes in the file identified by
  298       FileHandle and leaves pointer at the file end.*)
  299      VAR
  300        CurrentPTR: LONGINT;
  301        ErrorReturn: CARDINAL;
  302      BEGIN
  303        ErrorReturn :=FAPI.DOSCHGFILEPTR( FileHandle, VAL(LONGINT, 0),
  304            2, SYSTEM.ADR(CurrentPTR));
  305        IF ErrorReturn # 0 THEN
  306          ErrorManager.WarnNumber("DosChgFilePtr error", ErrorReturn );
  307        END;
  308        RETURN CurrentPTR;
  309      END FileLengthWithMove;
  310  
  311  
  312    PROCEDURE FileLength(FileHandle : CARDINAL) : LONGINT;
  313       (*Returns the number of bytes in the file identified by
  314       FileHandle.*)
  315      VAR
  316        answer, oldpos : LONGINT;
  317      BEGIN
  318       (* First, save current position so we can restore the pointer
  319          to its original location at the end.*)
  320        oldpos := GetFilePtr(FileHandle);
  321        (* now check file size with move to file end *)
  322        answer := FileLengthWithMove(FileHandle);
  323       (* now, restore the file pointer to where it was *)
  324        SetFilePtr(FileHandle, FromStart, oldpos);
  325        RETURN (answer);
  326      END FileLength;
  327  
  328  
  329    PROCEDURE EndReached(FileHandle : CARDINAL) : BOOLEAN;
  330      VAR
  331        curpos : LONGINT;
  332        ErrorReturn, BytesRead: CARDINAL;
  333        x : ARRAY [0..1] OF CHAR;
  334      BEGIN
  335        ErrorReturn := FAPI.DOSCHGFILEPTR( FileHandle, VAL(LONGINT, 0),
  336            1, SYSTEM.ADR(curpos));
  337          (* Get current position. *)
  338        ErrorReturn := FAPI.DOSREAD( FileHandle, SYSTEM.ADR(x), 1,
  339            SYSTEM.ADR(BytesRead));
  340          (* Try to read one byte. *)
  341        IF BytesRead = 1 THEN
  342          (* Read was successful, so we must not have reached the end. *)
  343          ErrorReturn := FAPI.DOSCHGFILEPTR( FileHandle, curpos,
  344              0, SYSTEM.ADR(curpos));
  345          (* Move file pointer back to its original position. *)
  346          RETURN FALSE;
  347        ELSE
  348          RETURN TRUE;
  349        END;
  350      END EndReached;
  351  
  352  
  353    PROCEDURE FileExists(fname : ARRAY OF CHAR) : BOOLEAN;
  354      VAR
  355        FileAttribute: CARDINAL;
  356        Reserved: LONGINT;
  357        filen : ARRAY [0..79] OF CHAR;
  358      BEGIN
  359        StrEdit.AssignStr(fname, filen);
  360        Reserved := VAL(LONGINT, 0);
  361        IF FAPI.DOSQFILEMODE( SYSTEM.ADR(filen),
  362            SYSTEM.ADR(FileAttribute), Reserved)= 0 THEN
  363          RETURN TRUE;
  364        ELSE
  365          RETURN FALSE;
  366        END;
  367      END FileExists;
  368  
  369  
  370    PROCEDURE SetFilePtr(FileHandle : CARDINAL; Origin : FileOffSet;
  371        OffSet : LONGINT);
  372      VAR
  373        NewPtr : LONGINT;
  374        ErrorReturn: CARDINAL;
  375      BEGIN
  376        (* what if file length is zero??*)
  377        ErrorReturn := FAPI.DOSCHGFILEPTR(FileHandle, OffSet, ORD(Origin),
  378            SYSTEM.ADR(NewPtr));
  379        IF ErrorReturn # 0 THEN
  380          ErrorManager.WarnNumber( "DosChgFilePtr error", ErrorReturn );
  381        END;
  382      END SetFilePtr;
  383  
  384  
  385    PROCEDURE OpenForAppending( name : ARRAY OF CHAR; VAR handl : CARDINAL);
  386      VAR
  387        TmpName, msg: ARRAY [0..79] OF CHAR;
  388      BEGIN
  389        StrEdit.AssignStr( name, TmpName );
  390        IF FindFile( handl, TmpName, "path") <> StringIO.NoError THEN
  391          IF CreateFile( handl, TmpName) <> StringIO.NoError THEN
  392        StrEdit.AssignStr( "Cannot create ", msg);
  393        StrEdit.Append( msg, TmpName );
  394        StrEdit.Append( msg, '.' );
  395            ErrorManager.WARN( msg );
  396          END;
  397        ELSE
  398          SetFilePtr( handl, FromEnd, NumTypes.L0);
  399        END;
  400      END OpenForAppending;
  401  
  402  
  403    PROCEDURE BlockRead(FileHandle : CARDINAL; ptr : SYSTEM.ADDRESS; size :
  404        CARDINAL) : CARDINAL;
  405      VAR
  406        ErrorReturn, BytesRead: CARDINAL;
  407      BEGIN
  408        ErrorReturn := FAPI.DOSREAD( FileHandle, ptr, size,
  409            SYSTEM.ADR(BytesRead));
  410        IF ErrorReturn # 0 THEN
  411          ErrorManager.WarnNumber( "DOSREAD error", ErrorReturn );
  412        END;
  413  (* Looks like something may be wrong here. *)
  414        IF BytesRead < size THEN
  415          IF BytesRead = 0 THEN
  416            RETURN (StringIO.EndOfFile);
  417          ELSE
  418            RETURN (StringIO.PartialRead);
  419          END;
  420        END;
  421        RETURN ErrorReturn;
  422      END BlockRead;
  423  
  424  
  425    PROCEDURE BlockWrite(FileHandle : CARDINAL; ptr : SYSTEM.ADDRESS; size :
  426        CARDINAL) : CARDINAL;
  427      VAR
  428        ErrorReturn, BytesWritten: CARDINAL;
  429      BEGIN
  430        ErrorReturn := FAPI.DOSWRITE(FileHandle, ptr, size,
  431              SYSTEM.ADR(BytesWritten));
  432        IF ErrorReturn # 0 THEN
  433          ErrorManager.WarnNumber( 'DOSWRITE error', ErrorReturn );
  434        END;
  435        RETURN ErrorReturn;
  436      END BlockWrite;
  437  
  438  
  439    PROCEDURE NewHandleCopy( OldHandle: CARDINAL;
  440          VAR NewHandle: CARDINAL ): CARDINAL;
  441      (*Duplicates an open file handle and returns a new handle
  442        number that refers to the same file or device.  Useful for
  443        updating files without closing them.*)
  444    VAR
  445      ErrorReturn: CARDINAL;
  446    BEGIN
  447      NewHandle := 0FFFFH;
  448      ErrorReturn := FAPI.DOSDUPHANDLE(OldHandle, SYSTEM.ADR(NewHandle));
  449      RETURN ErrorReturn;
  450    END NewHandleCopy;
  451  
  452  
  453    PROCEDURE ForceHandleCopy( OldHandle, NewHandle: CARDINAL):
  454          CARDINAL;
  455      (*Similar to NewHandleCopy, but makes an existing handle
  456        (NewHandle) refer to another one (OldHandle).  Closes
  457        NewHandle first, and then reopens it as a copy of
  458        OldHandle.  Useful for dynamic I/O redirection.*)
  459    VAR
  460      ErrorReturn: CARDINAL;
  461    BEGIN
  462      ErrorReturn := FAPI.DOSDUPHANDLE(OldHandle, SYSTEM.ADR(NewHandle));
  463      RETURN ErrorReturn;
  464    END ForceHandleCopy;
  465  
  466  
  467    PROCEDURE UpdateDisk( FileHandle: CARDINAL );
  468      (*Writes a file's current buffers to the disk and writes its
  469        current length and time to the directory without requiring
  470        it to be closed.*)
  471    VAR
  472      ErrorCode,
  473      TmpHandle: CARDINAL;
  474    BEGIN
  475    ErrorCode:=FAPI.DOSBUFRESET( FileHandle );
  476    IF ErrorCode # 0 THEN
  477        ErrorManager.WarnNumber('UpdateDisk Error',ErrorCode );
  478    END;
  479  
  480   (*   IF NewHandleCopy( FileHandle, TmpHandle ) = StringIO.NoError THEN
  481        StringIO.PrintMessage( CloseHandle(TmpHandle) );
  482      END;*)
  483    END UpdateDisk;
  484  
  485  PROCEDURE FillFile( FileHandle: CARDINAL; NumberOfBytes:
  486      CARDINAL; TheByte: CHAR ): CARDINAL;
  487    VAR
  488      TmpAdr: SYSTEM.ADDRESS;
  489      SavedMessage: CARDINAL;
  490    BEGIN
  491      IF NOT VStorage.DosAvail( NumberOfBytes ) THEN
  492        RETURN StringIO.TooLittleMemory;
  493      END;
  494      VStorage.DosAlloc( TmpAdr, NumberOfBytes );
  495      LowLevel.Fill( TmpAdr, NumberOfBytes, TheByte );
  496      SavedMessage := BlockWrite( FileHandle, TmpAdr,
  497          NumberOfBytes );
  498      VStorage.DosDealloc( TmpAdr, NumberOfBytes );
  499      RETURN SavedMessage;
  500    END FillFile;
  501  
  502  
  503  
  504  BEGIN
  505    Initialized := FALSE;
  506    Init();
  507    Init();
  508  END HandleIO.

   35 errors