gcc/ada/a-direio.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT RUN-TIME COMPONENTS                         --
   4 --                                                                          --
   5 --                        A D A . D I R E C T _ I O                         --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --          Copyright (C) 1992-2006, Free Software Foundation, Inc.         --
  10 --                                                                          --
  11 -- This specification is derived from the Ada Reference Manual for use with --
  12 -- GNAT. The copyright notice above, and the license provisions that follow --
  13 -- apply solely to the  contents of the part following the private keyword. --
  14 --                                                                          --
  15 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  16 -- terms of the  GNU General Public License as published  by the Free Soft- --
  17 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  18 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  19 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  20 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  21 -- for  more details.  You should have  received  a copy of the GNU General --
  22 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  23 -- to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, --
  24 -- Boston, MA 02110-1301, USA.                                              --
  25 --                                                                          --
  26 -- As a special exception,  if other files  instantiate  generics from this --
  27 -- unit, or you link  this unit with other files  to produce an executable, --
  28 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  29 -- covered  by the  GNU  General  Public  License.  This exception does not --
  30 -- however invalidate  any other reasons why  the executable file  might be --
  31 -- covered by the  GNU Public License.                                      --
  32 --                                                                          --
  33 -- GNAT was originally developed  by the GNAT team at  New York University. --
  34 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  35 --                                                                          --
  36 ------------------------------------------------------------------------------
  37
  38 with Ada.IO_Exceptions;
  39 with System.Direct_IO;
  40 with Interfaces.C_Streams;
  41
  42 generic
  43    type Element_Type is private;
  44
  45 package Ada.Direct_IO is
  46
  47    pragma Compile_Time_Warning
  48      (Element_Type'Has_Access_Values,
  49       "Element_Type for Direct_IO instance has access values");
  50
  51    type File_Type is limited private;
  52
  53    type File_Mode is (In_File, Inout_File, Out_File);
  54
  55    --  The following representation clause allows the use of unchecked
  56    --  conversion for rapid translation between the File_Mode type
  57    --  used in this package and System.File_IO.
  58
  59    for File_Mode use
  60      (In_File    => 0,   -- System.File_IO.File_Mode'Pos (In_File)
  61       Inout_File => 1,   -- System.File_IO.File_Mode'Pos (Inout_File);
  62       Out_File   => 2);  -- System.File_IO.File_Mode'Pos (Out_File)
  63
  64    type Count is range 0 .. System.Direct_IO.Count'Last;
  65
  66    subtype Positive_Count is Count range 1 .. Count'Last;
  67
  68    ---------------------
  69    -- File Management --
  70    ---------------------
  71
  72    procedure Create
  73      (File : in out File_Type;
  74       Mode : File_Mode := Inout_File;
  75       Name : String := "";
  76       Form : String := "");
  77
  78    procedure Open
  79      (File : in out File_Type;
  80       Mode : File_Mode;
  81       Name : String;
  82       Form : String := "");
  83
  84    procedure Close  (File : in out File_Type);
  85    procedure Delete (File : in out File_Type);
  86    procedure Reset  (File : in out File_Type; Mode : File_Mode);
  87    procedure Reset  (File : in out File_Type);
  88
  89    function Mode (File : File_Type) return File_Mode;
  90    function Name (File : File_Type) return String;
  91    function Form (File : File_Type) return String;
  92
  93    function Is_Open (File : File_Type) return Boolean;
  94
  95    ---------------------------------
  96    -- Input and Output Operations --
  97    ---------------------------------
  98
  99    procedure Read
 100      (File : File_Type;
 101       Item : out Element_Type;
 102       From : Positive_Count);
 103
 104    procedure Read
 105      (File : File_Type;
 106       Item : out Element_Type);
 107
 108    procedure Write
 109      (File : File_Type;
 110       Item : Element_Type;
 111       To   : Positive_Count);
 112
 113    procedure Write
 114      (File : File_Type;
 115       Item : Element_Type);
 116
 117    procedure Set_Index (File : File_Type; To : Positive_Count);
 118
 119    function Index (File : File_Type) return Positive_Count;
 120    function Size  (File : File_Type) return Count;
 121
 122    function End_Of_File (File : File_Type) return Boolean;
 123
 124    ----------------
 125    -- Exceptions --
 126    ----------------
 127
 128    Status_Error : exception renames IO_Exceptions.Status_Error;
 129    Mode_Error   : exception renames IO_Exceptions.Mode_Error;
 130    Name_Error   : exception renames IO_Exceptions.Name_Error;
 131    Use_Error    : exception renames IO_Exceptions.Use_Error;
 132    Device_Error : exception renames IO_Exceptions.Device_Error;
 133    End_Error    : exception renames IO_Exceptions.End_Error;
 134    Data_Error   : exception renames IO_Exceptions.Data_Error;
 135
 136 private
 137    type File_Type is new System.Direct_IO.File_Type;
 138
 139    Bytes : constant Interfaces.C_Streams.size_t :=
 140              Element_Type'Max_Size_In_Storage_Elements;
 141    --  Size of an element in storage units
 142
 143    pragma Inline (Close);
 144    pragma Inline (Create);
 145    pragma Inline (Delete);
 146    pragma Inline (End_Of_File);
 147    pragma Inline (Form);
 148    pragma Inline (Index);
 149    pragma Inline (Is_Open);
 150    pragma Inline (Mode);
 151    pragma Inline (Name);
 152    pragma Inline (Open);
 153    pragma Inline (Read);
 154    pragma Inline (Reset);
 155    pragma Inline (Set_Index);
 156    pragma Inline (Size);
 157    pragma Inline (Write);
 158
 159 end Ada.Direct_IO;