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

--                                                                          --

--                         GNAT COMPILER COMPONENTS                         --

--                                                                          --

--                I N T E R F A C E S . C . P O I N T E R S                 --

--                                                                          --

--                                 S p e c                                  --

--                                                                          --

--          Copyright (C) 1993-2009, Free Software Foundation, Inc.         --

--                                                                          --

-- This specification is derived from the Ada Reference Manual for use with --

-- GNAT. The copyright notice above, and the license provisions that follow --

-- apply solely to the  contents of the part following the private keyword. --

--                                                                          --

-- 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.      --

--                                                                          --

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

generic

   type Index is (<>);

   type Element is private;

   type Element_Array is array (Index range <>) of aliased Element;

   Default_Terminator : Element;

package Interfaces.C.Pointers is

   pragma Preelaborate;

   type Pointer is access all Element;

   pragma No_Strict_Aliasing (Pointer);

   --  We turn off any strict aliasing assumptions for the pointer type,

   --  since it is possible to create "improperly" aliased values.

   function Value

     (Ref        : Pointer;

      Terminator : Element := Default_Terminator) return Element_Array;

   function Value

     (Ref    : Pointer;

      Length : ptrdiff_t) return Element_Array;

   Pointer_Error : exception;

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

   -- C-style Pointer Arithmetic --

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

   function "+" (Left : Pointer;   Right : ptrdiff_t) return Pointer;

   function "+" (Left : ptrdiff_t; Right : Pointer)   return Pointer;

   function "-" (Left : Pointer;   Right : ptrdiff_t) return Pointer;

   function "-" (Left : Pointer;   Right : Pointer)   return ptrdiff_t;

   procedure Increment (Ref : in out Pointer);

   procedure Decrement (Ref : in out Pointer);

   pragma Convention (Intrinsic, "+");

   pragma Convention (Intrinsic, "-");

   pragma Convention (Intrinsic, Increment);

   pragma Convention (Intrinsic, Decrement);

   function Virtual_Length

     (Ref        : Pointer;

      Terminator : Element := Default_Terminator) return ptrdiff_t;

   procedure Copy_Terminated_Array

     (Source     : Pointer;

      Target     : Pointer;

      Limit      : ptrdiff_t := ptrdiff_t'Last;

      Terminator : Element := Default_Terminator);

   procedure Copy_Array

     (Source  : Pointer;

      Target  : Pointer;

      Length  : ptrdiff_t);

private

   pragma Inline ("+");

   pragma Inline ("-");

   pragma Inline (Decrement);

   pragma Inline (Increment);

end Interfaces.C.Pointers;