New Language: Ada

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@45957 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 130 insertions, 0 deletions

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+------------------------------------------------------------------------------
+--                                                                          --
+--                         GNAT RUNTIME COMPONENTS                          --
+--                                                                          --
+--                     S Y S T E M . D I R E C T _ I O                      --
+--                                                                          --
+--                                 S p e c                                  --
+--                                                                          --
+--                            $Revision: 1.10 $                             --
+--                                                                          --
+--   Copyright (C) 1992,1993,1994,1995,1996 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 package contains the declaration of the control block used for
+--  Direct_IO. This must be declared at the outer library level. It also
+--  contains code that is shared between instances of Direct_IO.
+
+with Interfaces.C_Streams;
+with Ada.Streams;
+with System.File_Control_Block;
+with System.Storage_Elements;
+
+package System.Direct_IO is
+
+   package FCB renames System.File_Control_Block;
+
+   type Operation is (Op_Read, Op_Write, Op_Other);
+   --  Type used to record last operation (to optimize sequential operations)
+
+   subtype Count is Interfaces.C_Streams.long;
+   --  The Count type in each instantiation is derived from this type
+
+   subtype Positive_Count is Count range 1 .. Count'Last;
+
+   type Direct_AFCB is new FCB.AFCB with record
+      Index : Count := 1;
+      --  Current Index value
+
+      Bytes : Interfaces.C_Streams.size_t;
+      --  Length of item in bytes (set from inside generic template)
+
+      Last_Op : Operation := Op_Other;
+      --  Last operation performed on file, used to avoid unnecessary
+      --  repositioning between successive read or write operations.
+   end record;
+
+   function AFCB_Allocate (Control_Block : Direct_AFCB) return FCB.AFCB_Ptr;
+
+   procedure AFCB_Close (File : access Direct_AFCB);
+   procedure AFCB_Free  (File : access Direct_AFCB);
+
+   procedure Read
+     (File : in out Direct_AFCB;
+      Item : out Ada.Streams.Stream_Element_Array;
+      Last : out Ada.Streams.Stream_Element_Offset);
+   --  Required overriding of Read, not actually used for Direct_IO
+
+   procedure Write
+     (File : in out Direct_AFCB;
+      Item : in Ada.Streams.Stream_Element_Array);
+   --  Required overriding of Write, not actually used for Direct_IO
+
+   type File_Type is access all Direct_AFCB;
+   --  File_Type in individual instantiations is derived from this type
+
+   procedure Create
+     (File : in out File_Type;
+      Mode : in FCB.File_Mode := FCB.Inout_File;
+      Name : in String := "";
+      Form : in String := "");
+
+   function End_Of_File (File : in File_Type) return Boolean;
+
+   function Index (File : in File_Type) return Positive_Count;
+
+   procedure Open
+     (File : in out File_Type;
+      Mode : in FCB.File_Mode;
+      Name : in String;
+      Form : in String := "");
+
+   procedure Read
+     (File : in File_Type;
+      Item : System.Address;
+      Size : in Interfaces.C_Streams.size_t;
+      From : in Positive_Count);
+
+   procedure Read
+     (File : in File_Type;
+      Item : System.Address;
+      Size : in Interfaces.C_Streams.size_t);
+
+   procedure Reset (File : in out File_Type; Mode : in FCB.File_Mode);
+
+   procedure Reset (File : in out File_Type);
+
+   procedure Set_Index (File : in File_Type; To : in Positive_Count);
+
+   function Size (File : in File_Type) return Count;
+
+   procedure Write
+     (File   : in File_Type;
+      Item   : System.Address;
+      Size   : in Interfaces.C_Streams.size_t;
+      Zeroes : System.Storage_Elements.Storage_Array);
+   --  Note: Zeroes is the buffer of zeroes used to fill out partial records
+
+end System.Direct_IO;