------------------------------------------------------------------------------
--                                                                          --
--                         GNAT COMPILER COMPONENTS                         --
--                                                                          --
--                         I N T E R F A C E S . C                          --
--                                                                          --
--                                 S p e c                                  --
--                                                                          --
--          Copyright (C) 1992-2019, 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.                                     --
--                                                                          --
--                                                                          --
--                                                                          --
--                                                                          --
--                                                                          --
-- 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 version contains only the type definitions for standard interfacing
--  with C. All functions have been removed from the original spec.

package Interfaces.C is
   pragma No_Elaboration_Code_All;
   pragma Pure;

   --  Declaration's based on C's <limits.h>

   CHAR_BIT  : constant := 8;
   SCHAR_MIN : constant := -128;
   SCHAR_MAX : constant := 127;
   UCHAR_MAX : constant := 255;

   --  Signed and Unsigned Integers. Note that in GNAT, we have ensured that
   --  the standard predefined Ada types correspond to the standard C types

   type int   is new Integer;
   type short is new Short_Integer;
   type long  is new Long_Integer;

   type signed_char is range SCHAR_MIN .. SCHAR_MAX;
   for signed_char'Size use CHAR_BIT;

   type unsigned       is mod 2 ** int'Size;
   type unsigned_short is mod 2 ** short'Size;
   type unsigned_long  is mod 2 ** long'Size;

   type unsigned_char is mod (UCHAR_MAX + 1);
   for unsigned_char'Size use CHAR_BIT;

   subtype plain_char is unsigned_char;

   type ptrdiff_t is
     range -(2 ** (Standard'Address_Size - 1)) ..
           +(2 ** (Standard'Address_Size - 1) - 1);

   type size_t is mod 2 ** Standard'Address_Size;

   --  Floating-Point

   type C_float     is new Float;
   type double      is new Standard.Long_Float;
   type long_double is new Standard.Long_Long_Float;

   ----------------------------
   -- Characters and Strings --
   ----------------------------

   type char is new Character;

   nul : constant char := char'First;

   type char_array is array (size_t range <>) of aliased char;
   for char_array'Component_Size use CHAR_BIT;

   ------------------------------------
   -- Wide Character and Wide String --
   ------------------------------------

   type wchar_t is new Wide_Character;
   for wchar_t'Size use Standard'Wchar_T_Size;

   wide_nul : constant wchar_t := wchar_t'First;

   type wchar_array is array (size_t range <>) of aliased wchar_t;

end Interfaces.C;
