| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT RUNTIME COMPONENTS -- |
| -- -- |
| -- A D A . D I R E C T _ I O -- |
| -- -- |
| -- B o d y -- |
| -- -- |
| -- $Revision: 1.22 $ -- |
| -- -- |
| -- 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. -- |
| -- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). -- |
| -- -- |
| ------------------------------------------------------------------------------ |
| |
| -- 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; |
