fs82voldata.c

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/*                                                                            */
/* Used procedures   :                                                        */
/* -------------------                                                        */
/*                                                                            */
/*                                                                            */
/*----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------*/
/*                                    DESCRIPTION                             */
/*                                                                            */
/*      This function insert a new file in volume's open files list	      */
/*									      */
/*----------------------------------------------------------------------------*/
/***************************************************************************)P*/
/* #*/
#undef PROCEDURE_NUMBER 
#define PROCEDURE_NUMBER 6

void Fs82_06VDInsertFileInVol( t_fsVolStruct * pp_Vol, t_fsFILE * pp_File )
{

  register t_fsFILE * pl_FileList = ( t_fsFILE *) pp_Vol->p_FileList;   /* Point on entity's file list */

   /* If list not empty update previous pointer of object in top of queue */
   /* If list is not empty previous pointer of element in top of queue is to pdate */
   if ( pl_FileList != NIL ) pl_FileList->p_VolPrecPtr = pp_File;

   /* Next pointers is set to pointer on linked list value */
   pp_File->p_VolNextPtr = pl_FileList;

   /* Like the insert is in top of file previous pointer is set to NIL */
   pp_File->p_VolPrecPtr = NIL;

   /* Pointer in volume structure point on the file structure */
   pp_Vol->p_FileList = pp_File;

   /* Update volume pointer in structure */
   pp_File->p_VolOfFile = pp_Vol;
}



/**/
/*P(***************************************************************************/
/* Procedure name : Fs82_07VDDeleteFileFromVol                                */
/* Object :    Delete a file from the opened file volume's opened files	list  */
/*----------------------------------------------------------------------------*/
/* Input parameters  :                                                        */
/* -------------------                                                        */
/*   t_fsVolStruct * pp_Vol : pointer on volume's control block 	      */
/*   t_fsFILE * pp_File      : Pointer on file structure		      */
/*						    			      */
/*									      */
/* Output parameters :                                                        */
/* -------------------                                                        */
/*									      */
/* Used variables    :                                                        */
/* -------------------                                                        */
/*   							                      */
/*                                                                            */
/* Used procedures   :                                                        */
/* -------------------                                                        */
/*                                                                            */
/*                                                                            */
/*----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------*/
/*                                    DESCRIPTION                             */
/*                                                                            */
/*      This function insert a new file in volume's open files list	      */
/*									      */
/*----------------------------------------------------------------------------*/
/***************************************************************************)P*/
/* #*/
#undef PROCEDURE_NUMBER 
#define PROCEDURE_NUMBER 7

void Fs82_07VDDeleteFileFromVol( t_fsFILE * pp_File )
{
  t_fsVolStruct *pl_Volume =  pp_File->p_VolOfFile;

   /* If object to delete in top of list updates list pointer else next pointer
			 of previous object */
   if ( pp_File-> p_VolPrecPtr == NIL ) pl_Volume->p_FileList = pp_File-> p_VolNextPtr;
   else pp_File-> p_VolPrecPtr->p_VolNextPtr = pp_File-> p_VolNextPtr;

   /* If object to delete not last of the queue updates previous pointer of next object */
   if ( pp_File-> p_VolNextPtr != NIL )
       		pp_File->p_VolNextPtr->p_VolPrecPtr = pp_File->p_VolPrecPtr;

}





/**/
/*P(***************************************************************************/
/* Procedure name : Fs82_08EDInsertDirInVolume                                */
/* Object :    Insert a new directory in volume's opened directories	      */
/*----------------------------------------------------------------------------*/
/* Input parameters  :                                                        */
/* -------------------                                                        */
/*   t_fsVolStruct * pp_Vol : pointer on volume's control block 	      */
/*   t_fsDIR * pp_Dir      : Pointer on directory structure		      */
/*						    			      */
/*									      */
/* Output parameters :                                                        */
/* -------------------                                                        */
/*									      */
/* Used variables    :                                                        */
/* -------------------                                                        */
/*   							                      */
/*                                                                            */
/* Used procedures   :                                                        */
/* -------------------                                                        */
/*                                                                            */
/*                                                                            */
/*----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------*/
/*                                    DESCRIPTION                             */
/*                                                                            */
/*   This function insert a new directory in volume's open directory list   */
/*									      */
/*----------------------------------------------------------------------------*/
/***************************************************************************)P*/
/* #*/
#undef PROCEDURE_NUMBER 
#define PROCEDURE_NUMBER 8

void Fs82_08VDInsertDirInVol( t_fsVolStruct * pp_Vol, t_fsDIR * pp_Dir )
{

  register t_fsDIR * pl_DirList = (t_fsDIR *) pp_Vol->p_DirList;   /* Point on volume's directory list */

   /* If list not empty update previous pointer of object in top of queue */
   /* If list is not empty previous pointer of element in top of queue is to pdate */
   if ( pl_DirList != NIL ) pl_DirList->p_VolPrecPtr = pp_Dir;

   /* Next pointers is set to pointer on linked list value */
   pp_Dir->p_VolNextPtr = pl_DirList;

   /* Like the insert is in top of file previous pointer is set to NIL */
   pp_Dir->p_VolPrecPtr = NIL;

   /* pointer in volume structure point on the file structure */
   pp_Vol->p_DirList = pp_Dir;

   /* Note volume pointer in dir structure */
   pp_Dir->p_VolOfDir = pp_Vol;
}


/**/
/*P(***************************************************************************/
/* Procedure name : Fs82_09VDDeleteDirFromVol                                 */
/* Object : Delete a directory from the opened dir volume's opened dir list   */
/*----------------------------------------------------------------------------*/
/* Input parameters  :                                                        */
/* -------------------                                                        */
/*									      */
/*   t_fsVolStruct * pp_Vol : pointer on volume's control block 	      */
/*   t_fsDIR * pp_Dir      : Pointer on directory's structure		      */
/*						    			      */
/*									      */
/* Output parameters :                                                        */
/* -------------------                                                        */
/*									      */
/* Used variables    :                                                        */
/* -------------------                                                        */
/*   							                      */
/*                                                                            */
/* Used procedures   :                                                        */
/* -------------------                                                        */
/*                                                                            */
/*                                                                            */
/*----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------*/
/*                                    DESCRIPTION                             */
/*                                                                            */
/*   This function insert a new directory in volume's open directory list   */
/*									      */
/*----------------------------------------------------------------------------*/
/***************************************************************************)P*/
/* #*/
#undef PROCEDURE_NUMBER 
#define PROCEDURE_NUMBER 9

void Fs82_09VDDeleteDirFromVol( t_fsDIR * pp_Dir )
{
  t_fsVolStruct * pl_Volume = pp_Dir->p_VolOfDir;

   /* If object to delete in top of list updates list pointer else next pointer
			 of previous object */
   if ( pp_Dir-> p_VolPrecPtr == NIL ) pl_Volume->p_DirList = pp_Dir-> p_VolNextPtr;
   else pp_Dir-> p_VolPrecPtr->p_VolNextPtr = pp_Dir-> p_VolNextPtr;

   /* If object to delete not last of the queue updates previous pointer of next object */
   if ( pp_Dir-> p_VolNextPtr != NIL )
       pp_Dir->p_VolNextPtr->p_VolPrecPtr = pp_Dir->p_VolPrecPtr;

}


/**/
/*P(***************************************************************************/
/* Procedure name : Fs82_10VDGetVolume		                              */
/* Object : gets a volume structure pointer of a given index		      */
/*----------------------------------------------------------------------------*/
/* Input parameters  :                                                        */
/* -------------------                                                        */
/*									      */
/*   u16 vp_Index : order of the volume				 	      */
/*						    			      */
/*									      */
/* Output parameters :                                                        */
/* -------------------                                                        */
/*    t_fsVolStruct * : pointer on the volume's structure		      */
/*									      */
/* Used variables    :                                                        */
/* -------------------                                                        */
/*   							                      */
/*                                                                            */
/* Used procedures   :                                                        */
/* -------------------                                                        */
/*                                                                            */
/*                                                                            */
/*----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------*/
/*                                    DESCRIPTION                             */
/*                                                                            */
/*   	Gets the volume structure in index passed in parameter		      */
/*									      */
/*----------------------------------------------------------------------------*/
/***************************************************************************)P*/
/* #*/
#undef PROCEDURE_NUMBER 
#define PROCEDURE_NUMBER 10

t_fsVolStruct * Fs82_10VDGetVolume( u16 vp_Index )
{
   t_fsVolStruct ** pl_VolumePtr = s_VolDataBaseStruct.p_VolTabIndexedByAlpha;

    /* If index greather than number of volumes mounted end of table reached return 0 */
    if ( vp_Index >= s_VolDataBaseStruct.v_NbrVolMounted ) return ( NIL );

    /* Else return value corresponding to index */
    return ( pl_VolumePtr[vp_Index] );
}


#endif /* FSS_FTR */