+++ /dev/null
-------------------------------------------------------------------------------
--- --
--- GNAT RUNTIME COMPONENTS --
--- --
--- A D A . D I R E C T _ I O --
--- --
--- B o d y --
--- --
--- $Revision: 1.1.16.2 $
--- --
--- Copyright (C) 1992-1998 Free Software Foundation, Inc. --
--- --
--- GNAT is free software; you can redistribute it and/or modify it under --
--- terms of the GNU General Public License as published by the Free Soft- --
--- ware Foundation; either version 2, or (at your option) any later ver- --
--- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
--- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
--- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
--- for more details. You should have received a copy of the GNU General --
--- Public License distributed with GNAT; see file COPYING. If not, write --
--- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
--- MA 02111-1307, USA. --
--- --
--- As a special exception, if other files instantiate generics from this --
--- unit, or you link this unit with other files to produce an executable, --
--- this unit does not by itself cause the resulting executable to be --
--- covered by the GNU General Public License. This exception does not --
--- however invalidate any other reasons why the executable file might be --
--- covered by the GNU Public License. --
--- --
--- GNAT was originally developed by the GNAT team at New York University. --
--- Extensive contributions were provided by Ada Core Technologies Inc. --
--- --
-------------------------------------------------------------------------------
-
--- This is the generic template for Direct_IO, i.e. the code that gets
--- duplicated. We absolutely minimize this code by either calling routines
--- in System.File_IO (for common file functions), or in System.Direct_IO
--- (for specialized Direct_IO functions)
-
-with Interfaces.C_Streams; use Interfaces.C_Streams;
-with System; use System;
-with System.File_Control_Block;
-with System.File_IO;
-with System.Direct_IO;
-with System.Storage_Elements;
-with Unchecked_Conversion;
-
-use type System.Direct_IO.Count;
-
-package body Ada.Direct_IO is
-
- Zeroes : System.Storage_Elements.Storage_Array :=
- (1 .. System.Storage_Elements.Storage_Offset (Bytes) => 0);
- -- Buffer used to fill out partial records.
-
- package FCB renames System.File_Control_Block;
- package FIO renames System.File_IO;
- package DIO renames System.Direct_IO;
-
- SU : constant := System.Storage_Unit;
-
- subtype AP is FCB.AFCB_Ptr;
- subtype FP is DIO.File_Type;
- subtype DCount is DIO.Count;
- subtype DPCount is DIO.Positive_Count;
-
- function To_FCB is new Unchecked_Conversion (File_Mode, FCB.File_Mode);
- function To_DIO is new Unchecked_Conversion (FCB.File_Mode, File_Mode);
-
- -----------
- -- Close --
- -----------
-
- procedure Close (File : in out File_Type) is
- begin
- FIO.Close (AP (File));
- end Close;
-
- ------------
- -- Create --
- ------------
-
- procedure Create
- (File : in out File_Type;
- Mode : in File_Mode := Inout_File;
- Name : in String := "";
- Form : in String := "")
- is
- begin
- DIO.Create (FP (File), To_FCB (Mode), Name, Form);
- File.Bytes := Bytes;
- end Create;
-
- ------------
- -- Delete --
- ------------
-
- procedure Delete (File : in out File_Type) is
- begin
- FIO.Delete (AP (File));
- end Delete;
-
- -----------------
- -- End_Of_File --
- -----------------
-
- function End_Of_File (File : in File_Type) return Boolean is
- begin
- return DIO.End_Of_File (FP (File));
- end End_Of_File;
-
- ----------
- -- Form --
- ----------
-
- function Form (File : in File_Type) return String is
- begin
- return FIO.Form (AP (File));
- end Form;
-
- -----------
- -- Index --
- -----------
-
- function Index (File : in File_Type) return Positive_Count is
- begin
- return Positive_Count (DIO.Index (FP (File)));
- end Index;
-
- -------------
- -- Is_Open --
- -------------
-
- function Is_Open (File : in File_Type) return Boolean is
- begin
- return FIO.Is_Open (AP (File));
- end Is_Open;
-
- ----------
- -- Mode --
- ----------
-
- function Mode (File : in File_Type) return File_Mode is
- begin
- return To_DIO (FIO.Mode (AP (File)));
- end Mode;
-
- ----------
- -- Name --
- ----------
-
- function Name (File : in File_Type) return String is
- begin
- return FIO.Name (AP (File));
- end Name;
-
- ----------
- -- Open --
- ----------
-
- procedure Open
- (File : in out File_Type;
- Mode : in File_Mode;
- Name : in String;
- Form : in String := "")
- is
- begin
- DIO.Open (FP (File), To_FCB (Mode), Name, Form);
- File.Bytes := Bytes;
- end Open;
-
- ----------
- -- Read --
- ----------
-
- procedure Read
- (File : in File_Type;
- Item : out Element_Type;
- From : in Positive_Count)
- is
- begin
- -- For a non-constrained variant record type, we read into an
- -- intermediate buffer, since we may have the case of discriminated
- -- records where a discriminant check is required, and we may need
- -- to assign only part of the record buffer originally written
-
- if not Element_Type'Constrained then
- declare
- Buf : Element_Type;
-
- begin
- DIO.Read (FP (File), Buf'Address, Bytes, DPCount (From));
- Item := Buf;
- end;
-
- -- In the normal case, we can read straight into the buffer
-
- else
- DIO.Read (FP (File), Item'Address, Bytes, DPCount (From));
- end if;
- end Read;
-
- procedure Read (File : in File_Type; Item : out Element_Type) is
- begin
- -- Same processing for unconstrained case as above
-
- if not Element_Type'Constrained then
- declare
- Buf : Element_Type;
-
- begin
- DIO.Read (FP (File), Buf'Address, Bytes);
- Item := Buf;
- end;
-
- else
- DIO.Read (FP (File), Item'Address, Bytes);
- end if;
- end Read;
-
- -----------
- -- Reset --
- -----------
-
- procedure Reset (File : in out File_Type; Mode : in File_Mode) is
- begin
- DIO.Reset (FP (File), To_FCB (Mode));
- end Reset;
-
- procedure Reset (File : in out File_Type) is
- begin
- DIO.Reset (FP (File));
- end Reset;
-
- ---------------
- -- Set_Index --
- ---------------
-
- procedure Set_Index (File : in File_Type; To : in Positive_Count) is
- begin
- DIO.Set_Index (FP (File), DPCount (To));
- end Set_Index;
-
- ----------
- -- Size --
- ----------
-
- function Size (File : in File_Type) return Count is
- begin
- return Count (DIO.Size (FP (File)));
- end Size;
-
- -----------
- -- Write --
- -----------
-
- procedure Write
- (File : in File_Type;
- Item : in Element_Type;
- To : in Positive_Count)
- is
- begin
- DIO.Set_Index (FP (File), DPCount (To));
- DIO.Write (FP (File), Item'Address, Item'Size / SU, Zeroes);
- end Write;
-
- procedure Write (File : in File_Type; Item : in Element_Type) is
- begin
- DIO.Write (FP (File), Item'Address, Item'Size / SU, Zeroes);
- end Write;
-
-end Ada.Direct_IO;
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