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--                                                                          --

--                         GNAT RUN-TIME COMPONENTS                         --

--                                                                          --

--             S Y S T E M . S T R E A M _ A T T R I B U T E S              --

--                                                                          --

--                                 S p e c                                  --

--                                                                          --

--          Copyright (C) 1992-2009, 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 3,  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.                                     --

--                                                                          --

-- As a special exception under Section 7 of GPL version 3, you are granted --

-- additional permissions described in the GCC Runtime Library Exception,   --

-- version 3.1, as published by the Free Software Foundation.               --

--                                                                          --

-- You should have received a copy of the GNU General Public License and    --

-- a copy of the GCC Runtime Library Exception along with this program;     --

-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --

-- <http://www.gnu.org/licenses/>.                                          --

--                                                                          --

-- GNAT was originally developed  by the GNAT team at  New York University. --

-- Extensive contributions were provided by Ada Core Technologies Inc.      --

--                                                                          --

------------------------------------------------------------------------------

--  This package contains the implementations of the stream attributes for

--  elementary types. These are the subprograms that are directly accessed

--  by occurrences of the stream attributes where the type is elementary.

--  We only provide the subprograms for the standard base types. For user

--  defined types, the subprogram for the corresponding root type is called

--  with an appropriate conversion.

with System;

with System.Unsigned_Types;

with Ada.Streams;

package System.Stream_Attributes is

   pragma Preelaborate;

   pragma Suppress (Accessibility_Check, Stream_Attributes);

   --  No need to check accessibility on arguments of subprograms

   package UST renames System.Unsigned_Types;

   subtype RST is Ada.Streams.Root_Stream_Type'Class;

   subtype SEC is Ada.Streams.Stream_Element_Count;

   --  Enumeration types are usually transferred using the routine for the

   --  corresponding integer. The exception is that special routines are

   --  provided for Boolean and the character types, in case the protocol

   --  in use provides specially for these types.

   --  Access types use either a thin pointer (single address) or fat pointer

   --  (double address) form. The following types are used to hold access

   --  values using unchecked conversions.

   type Thin_Pointer is record

      P1 : System.Address;

   end record;

   type Fat_Pointer is record

      P1 : System.Address;

      P2 : System.Address;

   end record;

   ------------------------------------

   -- Treatment of enumeration types --

   ------------------------------------

   --  In this interface, there are no specific routines for general input

   --  or output of enumeration types. Generally, enumeration types whose

   --  representation is unsigned (no negative representation values) are

   --  treated as unsigned integers, and enumeration types that do have

   --  negative representation values are treated as signed integers.

   --  An exception is that there are specialized routines for Boolean,

   --  Character, and Wide_Character types, but these specialized routines

   --  are used only if the type in question has a standard representation.

   --  For the case of a non-standard representation (one where the size of

   --  the first subtype is specified, or where an enumeration representation

   --  clause is given, these three types are treated like any other cases

   --  of enumeration types, as described above.

   --  for

   ---------------------

   -- Input Functions --

   ---------------------

   --  Functions for S'Input attribute. These functions are also used for

   --  S'Read, with the obvious transformation, since the input operation

   --  is the same for all elementary types (no bounds or discriminants

   --  are involved).

   function I_AD  (Stream : not null access RST) return Fat_Pointer;

   function I_AS  (Stream : not null access RST) return Thin_Pointer;

   function I_B   (Stream : not null access RST) return Boolean;

   function I_C   (Stream : not null access RST) return Character;

   function I_F   (Stream : not null access RST) return Float;

   function I_I   (Stream : not null access RST) return Integer;

   function I_LF  (Stream : not null access RST) return Long_Float;

   function I_LI  (Stream : not null access RST) return Long_Integer;

   function I_LLF (Stream : not null access RST) return Long_Long_Float;

   function I_LLI (Stream : not null access RST) return Long_Long_Integer;

   function I_LLU (Stream : not null access RST) return UST.Long_Long_Unsigned;

   function I_LU  (Stream : not null access RST) return UST.Long_Unsigned;

   function I_SF  (Stream : not null access RST) return Short_Float;

   function I_SI  (Stream : not null access RST) return Short_Integer;

   function I_SSI (Stream : not null access RST) return Short_Short_Integer;

   function I_SSU (Stream : not null access RST)

     return UST.Short_Short_Unsigned;

   function I_SU  (Stream : not null access RST) return UST.Short_Unsigned;

   function I_U   (Stream : not null access RST) return UST.Unsigned;

   function I_WC  (Stream : not null access RST) return Wide_Character;

   function I_WWC (Stream : not null access RST) return Wide_Wide_Character;

   -----------------------

   -- Output Procedures --

   -----------------------

   --  Procedures for S'Write attribute. These procedures are also used

   --  for 'Output, since for elementary types there is no difference

   --  between 'Write and 'Output because there are no discriminants

   --  or bounds to be written.

   procedure W_AD  (Stream : not null access RST; Item : Fat_Pointer);

   procedure W_AS  (Stream : not null access RST; Item : Thin_Pointer);

   procedure W_B   (Stream : not null access RST; Item : Boolean);

   procedure W_C   (Stream : not null access RST; Item : Character);

   procedure W_F   (Stream : not null access RST; Item : Float);

   procedure W_I   (Stream : not null access RST; Item : Integer);

   procedure W_LF  (Stream : not null access RST; Item : Long_Float);

   procedure W_LI  (Stream : not null access RST; Item : Long_Integer);

   procedure W_LLF (Stream : not null access RST; Item : Long_Long_Float);

   procedure W_LLI (Stream : not null access RST; Item : Long_Long_Integer);

   procedure W_LLU (Stream : not null access RST;

                    Item   : UST.Long_Long_Unsigned);

   procedure W_LU  (Stream : not null access RST; Item : UST.Long_Unsigned);

   procedure W_SF  (Stream : not null access RST; Item : Short_Float);

   procedure W_SI  (Stream : not null access RST; Item : Short_Integer);

   procedure W_SSI (Stream : not null access RST;

                    Item   : Short_Short_Integer);

   procedure W_SSU (Stream : not null access RST;

                    Item   : UST.Short_Short_Unsigned);

   procedure W_SU  (Stream : not null access RST;

                    Item   : UST.Short_Unsigned);

   procedure W_U   (Stream : not null access RST; Item : UST.Unsigned);

   procedure W_WC  (Stream : not null access RST; Item : Wide_Character);

   procedure W_WWC (Stream : not null access RST; Item : Wide_Wide_Character);

   function Block_IO_OK return Boolean;

   --  Package System.Stream_Attributes has several bodies - the default one

   --  distributed with GNAT, s-strxdr.adb which is based on the XDR standard

   --  and s-stratt.adb for Garlic. All three bodies share the same spec. The

   --  role of this function is to determine whether the current version of

   --  System.Stream_Attributes is able to support block IO.

private

   pragma Inline (I_AD);

   pragma Inline (I_AS);

   pragma Inline (I_B);

   pragma Inline (I_C);

   pragma Inline (I_F);

   pragma Inline (I_I);

   pragma Inline (I_LF);

   pragma Inline (I_LI);

   pragma Inline (I_LLF);

   pragma Inline (I_LLI);

   pragma Inline (I_LLU);

   pragma Inline (I_LU);

   pragma Inline (I_SF);

   pragma Inline (I_SI);

   pragma Inline (I_SSI);

   pragma Inline (I_SSU);

   pragma Inline (I_SU);

   pragma Inline (I_U);

   pragma Inline (I_WC);

   pragma Inline (I_WWC);

   pragma Inline (W_AD);

   pragma Inline (W_AS);

   pragma Inline (W_B);

   pragma Inline (W_C);

   pragma Inline (W_F);

   pragma Inline (W_I);

   pragma Inline (W_LF);

   pragma Inline (W_LI);

   pragma Inline (W_LLF);

   pragma Inline (W_LLI);

   pragma Inline (W_LLU);

   pragma Inline (W_LU);

   pragma Inline (W_SF);

   pragma Inline (W_SI);

   pragma Inline (W_SSI);

   pragma Inline (W_SSU);

   pragma Inline (W_SU);

   pragma Inline (W_U);

   pragma Inline (W_WC);

   pragma Inline (W_WWC);

   pragma Inline (Block_IO_OK);

end System.Stream_Attributes;