284 lines
8.1 KiB
Ada
284 lines
8.1 KiB
Ada
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------------------------------------------------------------------------------
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-- --
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-- GNAT RUN-TIME COMPONENTS --
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-- --
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-- A D A . D I R E C T _ I O --
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-- --
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-- B o d y --
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-- --
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-- Copyright (C) 1992-2012, Free Software Foundation, Inc. --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 3, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. --
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-- --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception, --
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-- version 3.1, as published by the Free Software Foundation. --
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-- --
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-- You should have received a copy of the GNU General Public License and --
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-- a copy of the GCC Runtime Library Exception along with this program; --
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-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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-- <http://www.gnu.org/licenses/>. --
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-- --
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-- GNAT was originally developed by the GNAT team at New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc. --
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-- --
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------------------------------------------------------------------------------
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-- This is the generic template for Direct_IO, i.e. the code that gets
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-- duplicated. We absolutely minimize this code by either calling routines
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-- in System.File_IO (for common file functions), or in System.Direct_IO
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-- (for specialized Direct_IO functions)
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with Interfaces.C_Streams; use Interfaces.C_Streams;
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with System; use System;
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with System.CRTL;
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with System.File_Control_Block;
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with System.File_IO;
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with System.Direct_IO;
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with System.Storage_Elements;
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with Ada.Unchecked_Conversion;
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use type System.Direct_IO.Count;
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package body Ada.Direct_IO is
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Zeroes : constant System.Storage_Elements.Storage_Array :=
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(1 .. System.Storage_Elements.Storage_Offset (Bytes) => 0);
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-- Buffer used to fill out partial records
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package FCB renames System.File_Control_Block;
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package FIO renames System.File_IO;
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package DIO renames System.Direct_IO;
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SU : constant := System.Storage_Unit;
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subtype AP is FCB.AFCB_Ptr;
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subtype FP is DIO.File_Type;
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subtype DPCount is DIO.Positive_Count;
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function To_FCB is new Ada.Unchecked_Conversion (File_Mode, FCB.File_Mode);
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function To_DIO is new Ada.Unchecked_Conversion (FCB.File_Mode, File_Mode);
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use type System.CRTL.size_t;
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-----------
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-- Close --
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-----------
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procedure Close (File : in out File_Type) is
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begin
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FIO.Close (AP (File)'Unrestricted_Access);
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end Close;
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------------
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-- Create --
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------------
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procedure Create
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(File : in out File_Type;
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Mode : File_Mode := Inout_File;
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Name : String := "";
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Form : String := "")
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is
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begin
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DIO.Create (FP (File), To_FCB (Mode), Name, Form);
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File.Bytes := Bytes;
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end Create;
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------------
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-- Delete --
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------------
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procedure Delete (File : in out File_Type) is
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begin
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FIO.Delete (AP (File)'Unrestricted_Access);
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end Delete;
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-----------------
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-- End_Of_File --
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-----------------
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function End_Of_File (File : File_Type) return Boolean is
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begin
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return DIO.End_Of_File (FP (File));
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end End_Of_File;
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----------
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-- Form --
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----------
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function Form (File : File_Type) return String is
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begin
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return FIO.Form (AP (File));
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end Form;
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-----------
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-- Index --
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-----------
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function Index (File : File_Type) return Positive_Count is
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begin
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return Positive_Count (DIO.Index (FP (File)));
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end Index;
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-------------
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-- Is_Open --
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-------------
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function Is_Open (File : File_Type) return Boolean is
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begin
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return FIO.Is_Open (AP (File));
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end Is_Open;
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----------
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-- Mode --
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----------
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function Mode (File : File_Type) return File_Mode is
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begin
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return To_DIO (FIO.Mode (AP (File)));
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end Mode;
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----------
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-- Name --
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----------
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function Name (File : File_Type) return String is
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begin
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return FIO.Name (AP (File));
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end Name;
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----------
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-- Open --
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----------
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procedure Open
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(File : in out File_Type;
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Mode : File_Mode;
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Name : String;
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Form : String := "")
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is
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begin
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DIO.Open (FP (File), To_FCB (Mode), Name, Form);
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File.Bytes := Bytes;
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end Open;
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----------
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-- Read --
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----------
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procedure Read
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(File : File_Type;
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Item : out Element_Type;
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From : Positive_Count)
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is
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begin
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-- For a non-constrained variant record type, we read into an
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-- intermediate buffer, since we may have the case of discriminated
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-- records where a discriminant check is required, and we may need
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-- to assign only part of the record buffer originally written.
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-- Note: we have to turn warnings on/off because this use of
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-- the Constrained attribute is an obsolescent feature.
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pragma Warnings (Off);
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if not Element_Type'Constrained then
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pragma Warnings (On);
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declare
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Buf : Element_Type;
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begin
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DIO.Read (FP (File), Buf'Address, Bytes, DPCount (From));
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Item := Buf;
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end;
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-- In the normal case, we can read straight into the buffer
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else
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DIO.Read (FP (File), Item'Address, Bytes, DPCount (From));
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end if;
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end Read;
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procedure Read (File : File_Type; Item : out Element_Type) is
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begin
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-- Same processing for unconstrained case as above
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-- Note: we have to turn warnings on/off because this use of
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-- the Constrained attribute is an obsolescent feature.
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pragma Warnings (Off);
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if not Element_Type'Constrained then
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pragma Warnings (On);
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declare
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Buf : Element_Type;
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begin
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DIO.Read (FP (File), Buf'Address, Bytes);
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Item := Buf;
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end;
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else
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DIO.Read (FP (File), Item'Address, Bytes);
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end if;
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end Read;
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-----------
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-- Reset --
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-----------
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procedure Reset (File : in out File_Type; Mode : File_Mode) is
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begin
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DIO.Reset (FP (File), To_FCB (Mode));
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end Reset;
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procedure Reset (File : in out File_Type) is
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begin
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DIO.Reset (FP (File));
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end Reset;
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---------------
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-- Set_Index --
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---------------
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procedure Set_Index (File : File_Type; To : Positive_Count) is
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begin
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DIO.Set_Index (FP (File), DPCount (To));
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end Set_Index;
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----------
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-- Size --
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----------
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function Size (File : File_Type) return Count is
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begin
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return Count (DIO.Size (FP (File)));
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end Size;
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-----------
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-- Write --
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-----------
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procedure Write
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(File : File_Type;
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Item : Element_Type;
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To : Positive_Count)
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is
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begin
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DIO.Set_Index (FP (File), DPCount (To));
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DIO.Write (FP (File), Item'Address, Item'Size / SU, Zeroes);
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end Write;
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procedure Write (File : File_Type; Item : Element_Type) is
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begin
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DIO.Write (FP (File), Item'Address, Item'Size / SU, Zeroes);
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end Write;
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end Ada.Direct_IO;
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