CP/M/CPM_CDROM.iso/cpm/utils/dskutl/swp-ms10.ark/TRAMDF.IF2

Text File | 1989-09-27 | 9KB | 300 lines

{* -------------------------------------------------------------------------
 *                  F I L E   L I S T   M A N A G E M E N T
 * ------------------------------------------------------------------------- *}

{*
 * For the FileManger, a list of files on the source disk is maintained in
 * memory.  It is a double-linked circular list containing one special entry
 * which serves as the sentinel for the EnterFileInList sort procedure.
 *
 * Most of the procedures work on the 'current' (file) list entry.  It is the
 * entry pointed to by the global variable FileEntry.
 *}

function GetFileEntryName: FullFileNames ;
{*
 * Fetch the name of the current (file) entry and insert the separator
 * between the primary file name and the extension.
 *}
begin
   with FileEntry^ do
     GetFileEntryName:= Copy( Name, 1, 8 ) + '.' + Copy( Name, 9, 3 ) ;
end ;  { of GetFileEntryName }

function IsDirectory: Boolean ;
{*
 * Determine whether the current file list entry contains a subdirectoryname,
 * thus not a filename or a volumename.
 *}
begin
   IsDirectory:= ( SubDirectory in FileEntry^.Attr ) ;
end ;  { of IsDirectory }

function IsFile: Boolean ;
{*
 * Determine whether the current file list entry contains a filename, and
 * thus not a volumename or a subdirectoryname.
 *}
begin
   IsFile:= ( FileEntry^.Attr*[Volume,SubDirectory] = [] ) ;
end ;  { of IsFile }

procedure AdvanceFileEntry ;
{*
 * Advance the pointer FileEntry to the next (file) entry in the list.  If
 * at the end of the list, wrap to the first entry in the list.
 *}
begin
   FileEntry:= FileEntry^.Next ;
   FileIndex:= Succ( FileIndex ) ;
   if FileEntry=TailFileList then
    begin
     FileEntry:= HeadFileList ;
     FileIndex:=            1 ;
     WriteLn ;
    end ;  { of if }
end ;  { of AdvanceFileEntry }

procedure BackupFileEntry ;
{*
 * Set the pointer FileEntry to the preceding entry in the filelist.  If
 * at the beginning of the list, wrap to the last entry in the list.
 *}
begin
   FileEntry:= FileEntry^.Prev ;
   FileIndex:= Pred( FileIndex ) ;
   if FileEntry=TailFileList then
    begin
     FileEntry:= FileEntry^.Prev ;
     FileIndex:= SizeFileList ;
     WriteLn ;
    end ;  { of if }
end ;  { of BackupFileEntry }

procedure DeleteFileEntry ;
{*
 * Remove the current entry from the filelist and select the logical next
 * entry as the current entry.  If the entry is marked, an implicit and
 * silent UntagFileEntry is performed.
 *}
var
   FreeEntry: FileEntryPtr ;  { Entry to be released }
begin
   if FileEntry^.Mark then
     SizeTaggedFiles:= SizeTaggedFiles - FileEntry^.Size ;
{*
 * If the first entry in the list is to be deleted, move the head pointer
 * to the next entry in the list.
 *}
   if HeadFileList=FileEntry then
     HeadFileList:= HeadFileList^.Next ;
{*
 * Detach the entry to be deleted from the filelist.
 *}
   FileEntry^.Prev^.Next:= FileEntry^.Next ;
   FileEntry^.Next^.Prev:= FileEntry^.Prev ;
   SizeFileList:= Pred( SizeFileList ) ;
{*
 * Set the 'current' entry to the logical next entry in the list.
 *}
   FreeEntry:= FileEntry ;         { Save pointer to the former entry }
   FileEntry:= FileEntry^.Next ;
   if FileEntry=TailFileList then
    begin
     FileEntry:= HeadFileList ;
     FileIndex:=            1 ;
    end ;  { of if }

   Dispose( FreeEntry ) ;  { Finally, release the file entry }
end ;  { of DeleteFileEntry }

procedure DisplayFileEntry ;
{*
 * Display the name and the attributes of the current (file) entry.
 *}
begin
   with FileEntry^ do
    begin
     WriteLn ;
     Write( FileIndex:3, ' : ', GetFileEntryName, ' ' ) ;
     if ReadOnly     in Attr then  Write( 'R' )  else  Write( '-' ) ;
     if Hidden       in Attr then  Write( 'H' )  else  Write( '-' ) ;
     if System       in Attr then  Write( 'S' )  else  Write( '-' ) ;
     if Volume       in Attr then  Write( 'V' )  else  Write( '-' ) ;
     if SubDirectory in Attr then  Write( 'D' )  else  Write( '-' ) ;
     if Archive      in Attr then  Write( 'A' )  else  Write( '-' ) ;
     Write( ' ', Size:5, 'K :' ) ;
     if Mark                 then  Write( '*' )  else  Write( ' ' ) ;
    end ;  { of with }
end ;  { of DisplayFileEntry }

procedure EnterFileInList ;
{*
 * Enter the file, specified in FileEntry, in the filelist.  If the
 * filename is already in the list, the filesize is set to the larger
 * of the two.
 *
 * Note that the last entry of the file list is a sentinel, containing
 * the greatest possible file name.
 *}
var
   NextEntry: FileEntryPtr ;  { Pointer to next element in list }
begin
   NextEntry:= HeadFileList ;
   while NextEntry<>Nil do
    begin
     if NextEntry^.Name=FileEntry^.Name then
{*
 * The file name is already entered in the file list.  This can happen
 * in CP/M only.  Save the biggest of the two file sizes and release the
 * file-entry.
 *}
      begin
       if NextEntry^.Size<FileEntry^.Size then
         NextEntry^.Size:= FileEntry^.Size ;
       NextEntry:= Nil ;  { Terminate loop }
       Dispose( FileEntry ) ;
      end
     else
       if NextEntry^.Name>FileEntry^.Name then
{*
 * The file name is not in the file list right now.  Enter it in the list.
 * Adjust the head pointer if necessary.
 *}
        begin
         FileEntry^.Next      := NextEntry ;
         FileEntry^.Prev      := NextEntry^.Prev ;
         NextEntry^.Prev      := FileEntry ;
         FileEntry^.Prev^.Next:= FileEntry ;

         if NextEntry=HeadFileList then
           HeadFileList:= FileEntry ;
         SizeFileList:= Succ( SizeFileList ) ;

         NextEntry:= Nil ;  { Terminate loop }
        end
       else
{*
 * If the file name is in the list, it must after the entry in the list
 * pointed to by NextEntry.
 *}
         NextEntry:= NextEntry^.Next ;
    end ;  { of while }
end ;  { of EnterFileInList }

procedure PresetFileList ;
{*
 * Remove all entries, if any, from the filelist and make sure that the
 * filelist contains only the sentinel entry.
 *}
var
   NextEntry: FileEntryPtr ;  { Next entry in filelist }
begin
{*
 * Remove all but the sentinel entry in the filelist.
 *}
   NextEntry:= HeadFileList ;
   while NextEntry<>Nil do
     if NextEntry=TailFileList then
      begin
       HeadFileList:= NextEntry ;  { Save ptr to sentinel entry }
       NextEntry   :=       Nil ;  { Terminate loop }
      end
     else
      begin
       NextEntry:= NextEntry^.Next ;  { Address of successor }
       Dispose( NextEntry^.Prev )  ;  { Release preceding entry }
      end ;  { of if/while }
{*
 * The list contains now either zero or one entry.  In the former case a
 * sentinel entry is added to the list.
 *}
   if HeadFileList=Nil then
    begin
     New( HeadFileList ) ;
     TailFileList:= HeadFileList ;
    end ;  { of if }

   FileIndex      := 0 ;
   SizeFileList   := 0 ;
   SizeTaggedFiles:= 0 ;
   with HeadFileList^ do
    begin
     Next:= HeadFileList ;
     Prev:= HeadFileList ;
     Name:= #$FF#$FF#$FF#$FF#$FF#$FF#$FF#$FF#$FF#$FF#$FF ;
     Attr:=    [] ;
     Size:=     0 ;
     Mark:= False ;
    end ;  { of with }
end ;  { of PresetFileList }

procedure TagFileEntry ;
{*
 * Mark the current (file) entry to be used in one of the 'mass' operations
 * of the file manager.  The aggregate size of the tagged files is displayed.
 * An entry which does not correspond to a file cannot be marked!
 *}
begin
   if IsFile then
     if not FileEntry^.Mark then
      begin
       FileEntry^.Mark:= True ;
       SizeTaggedFiles:= SizeTaggedFiles + FileEntry^.Size ;
       Write( 'Tagged size =', SizeTaggedFiles:4, 'K' ) ;
      end ;  { of if/if }
end ;  { of TagFileEntry }

procedure TagMultipleFileEntries ;
{*
 * Tag those file entries in the file list which match a user-specified
 * wildcard mask.
 *}
var
   SavedFileEntry:    FileEntryPtr ;  { Save area for current file }
   RawFileName   :   FullFileNames ;  { Wildcard mask / file name }
   FileNameMask  : FileDescriptors ;  { Expanded file name mask }
   FileName      : FileDescriptors ;  { Filename to check against mask }
begin
   SavedFileEntry:= FileEntry ;

   Write( ' Enter mask : ' ) ;
   ReadLn( RawFileName ) ;
   SplitFileName( FileNameMask, RawFileName ) ;

   FileEntry:= HeadFileList ;
   while FileEntry<>TailFileList do
    begin
     if IsFile then
      begin
       RawFileName:= GetFileEntryName ;
       SplitFileName( FileName, RawFileName ) ;
       if SameName( FileName, FileNameMask, NE_Format ) then
        begin
         WriteLn ;
         Write( 'Tagging  --> ', RawFileName, ' : ' ) ;
         TagFileEntry ;
        end ;  { of if }
      end ;  { of if }
     FileEntry:= FileEntry^.Next ;
    end ;  { of while }

   FileEntry:= SavedFileEntry ;
end ;  { of TagMultipleFileEntries }

procedure UntagFileEntry ;
{*
 * Remove the mark from the current (file) entry.  The updated aggregate
 * size of the remaining tagged files is displayed.
 *}
begin
   if FileEntry^.Mark then
    begin
     FileEntry^.Mark:= False ;
     SizeTaggedFiles:= SizeTaggedFiles - FileEntry^.Size ;
     Write( 'Tagged size =', SizeTaggedFiles:4, 'K' ) ;
    end ;  { of if }
end ;  { of UntagFileEntry }