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   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                I N T E R F A C E S . C . P O I N T E R S                 --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --          Copyright (C) 1993-2009, Free Software Foundation, Inc.         --
  10 --                                                                          --
  11 -- This specification is derived from the Ada Reference Manual for use with --
  12 -- GNAT. The copyright notice above, and the license provisions that follow --
  13 -- apply solely to the  contents of the part following the private keyword. --
  14 --                                                                          --
  15 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  16 -- terms of the  GNU General Public License as published  by the Free Soft- --
  17 -- ware  Foundation;  either version 3,  or (at your option) any later ver- --
  18 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  19 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  20 -- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
  21 --                                                                          --
  22 -- As a special exception under Section 7 of GPL version 3, you are granted --
  23 -- additional permissions described in the GCC Runtime Library Exception,   --
  24 -- version 3.1, as published by the Free Software Foundation.               --
  25 --                                                                          --
  26 -- You should have received a copy of the GNU General Public License and    --
  27 -- a copy of the GCC Runtime Library Exception along with this program;     --
  28 -- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
  29 -- <http://www.gnu.org/licenses/>.                                          --
  30 --                                                                          --
  31 -- GNAT was originally developed  by the GNAT team at  New York University. --
  32 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  33 --                                                                          --
  34 ------------------------------------------------------------------------------
  35
  36 generic
  37    type Index is (<>);
  38    type Element is private;
  39    type Element_Array is array (Index range <>) of aliased Element;
  40    Default_Terminator : Element;
  41
  42 package Interfaces.C.Pointers is
  43    pragma Preelaborate;
  44
  45    type Pointer is access all Element;
  46
  47    pragma No_Strict_Aliasing (Pointer);
  48    --  We turn off any strict aliasing assumptions for the pointer type,
  49    --  since it is possible to create "improperly" aliased values.
  50
  51    function Value
  52      (Ref        : Pointer;
  53       Terminator : Element := Default_Terminator) return Element_Array;
  54
  55    function Value
  56      (Ref    : Pointer;
  57       Length : ptrdiff_t) return Element_Array;
  58
  59    Pointer_Error : exception;
  60
  61    --------------------------------
  62    -- C-style Pointer Arithmetic --
  63    --------------------------------
  64
  65    function "+" (Left : Pointer;   Right : ptrdiff_t) return Pointer;
  66    function "+" (Left : ptrdiff_t; Right : Pointer)   return Pointer;
  67    function "-" (Left : Pointer;   Right : ptrdiff_t) return Pointer;
  68    function "-" (Left : Pointer;   Right : Pointer)   return ptrdiff_t;
  69
  70    procedure Increment (Ref : in out Pointer);
  71    procedure Decrement (Ref : in out Pointer);
  72
  73    pragma Convention (Intrinsic, "+");
  74    pragma Convention (Intrinsic, "-");
  75    pragma Convention (Intrinsic, Increment);
  76    pragma Convention (Intrinsic, Decrement);
  77
  78    function Virtual_Length
  79      (Ref        : Pointer;
  80       Terminator : Element := Default_Terminator) return ptrdiff_t;
  81
  82    procedure Copy_Terminated_Array
  83      (Source     : Pointer;
  84       Target     : Pointer;
  85       Limit      : ptrdiff_t := ptrdiff_t'Last;
  86       Terminator : Element := Default_Terminator);
  87
  88    procedure Copy_Array
  89      (Source  : Pointer;
  90       Target  : Pointer;
  91       Length  : ptrdiff_t);
  92
  93 private
  94    pragma Inline ("+");
  95    pragma Inline ("-");
  96    pragma Inline (Decrement);
  97    pragma Inline (Increment);
  98
  99 end Interfaces.C.Pointers;