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+------------------------------------------------------------------------------
+--                                                                          --
+--                         GNAT COMPILER COMPONENTS                         --
+--                                                                          --
+--                         I N T E R F A C E S . C                          --
+--                                                                          --
+--                                 S p e c                                  --
+--                                                                          --
+-- This specification is derived from the Ada Reference Manual for use with --
+-- GNAT.  In accordance with the copyright of that document, you can freely --
+-- copy and modify this specification,  provided that if you redistribute a --
+-- modified version,  any changes that you have made are clearly indicated. --
+--                                                                          --
+------------------------------------------------------------------------------
+
+with System.Parameters;
+
+package Interfaces.C is
+   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
+
+   --  Note: the Integer qualifications used in the declaration of type long
+   --  avoid ambiguities when compiling in the presence of s-auxdec.ads and
+   --  a non-private system.address type.
+
+   type int   is new Integer;
+   type short is new Short_Integer;
+   type long  is range -(2 ** (System.Parameters.long_bits - Integer'(1)))
+     .. +(2 ** (System.Parameters.long_bits - Integer'(1))) - 1;
+
+   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; -- ??? should be parameterized
+
+   --  Note: the Integer qualifications used in the declaration of ptrdiff_t
+   --  avoid ambiguities when compiling in the presence of s-auxdec.ads and
+   --  a non-private system.address type.
+
+   type ptrdiff_t is
+     range -(2 ** (System.Parameters.ptr_bits - Integer'(1))) ..
+           +(2 ** (System.Parameters.ptr_bits - Integer'(1)) - 1);
+
+   type size_t is mod 2 ** System.Parameters.ptr_bits;
+
+   ----------------------------
+   -- Characters and Strings --
+   ----------------------------
+
+   type char is new Character;
+
+   nul : constant char := char'First;
+
+   function To_C   (Item : Character) return char;
+   function To_Ada (Item : char)      return Character;
+
+   type char_array is array (size_t range <>) of aliased char;
+   for char_array'Component_Size use CHAR_BIT;
+
+   function Is_Nul_Terminated (Item : char_array) return Boolean;
+
+end Interfaces.C;