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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;

   --  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;

   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;

   function To_C

     (Item       : String;

      Append_Nul : Boolean := True) return char_array;

   function To_Ada

     (Item     : char_array;

      Trim_Nul : Boolean := True) return String;

   procedure To_C

     (Item       : String;

      Target     : out char_array;

      Count      : out size_t;

      Append_Nul : Boolean := True);

   procedure To_Ada

     (Item     : char_array;

      Target   : out String;

      Count    : out Natural;

      Trim_Nul : Boolean := True);

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

   -- 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;

   function To_C   (Item : Wide_Character) return wchar_t;

   function To_Ada (Item : wchar_t)        return Wide_Character;

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

   function Is_Nul_Terminated (Item : wchar_array) return Boolean;

   function To_C

     (Item       : Wide_String;

      Append_Nul : Boolean := True) return wchar_array;

   function To_Ada

     (Item     : wchar_array;

      Trim_Nul : Boolean := True) return Wide_String;

   procedure To_C

     (Item       : Wide_String;

      Target     : out wchar_array;

      Count      : out size_t;

      Append_Nul : Boolean := True);

   procedure To_Ada

     (Item     : wchar_array;

      Target   : out Wide_String;

      Count    : out Natural;

      Trim_Nul : Boolean := True);

   Terminator_Error : exception;

   --  The remaining declarations are for Ada 2005 (AI-285)

   --  ISO/IEC 10646:2003 compatible types defined by SC22/WG14 document N1010

   type char16_t is new Wide_Character;

   pragma Ada_05 (char16_t);

   char16_nul : constant char16_t := char16_t'Val (0);

   pragma Ada_05 (char16_nul);

   function To_C (Item : Wide_Character) return char16_t;

   pragma Ada_05 (To_C);

   function To_Ada (Item : char16_t) return Wide_Character;

   pragma Ada_05 (To_Ada);

   type char16_array is array (size_t range <>) of aliased char16_t;

   pragma Ada_05 (char16_array);

   function Is_Nul_Terminated (Item : char16_array) return Boolean;

   pragma Ada_05 (Is_Nul_Terminated);

   function To_C

     (Item       : Wide_String;

      Append_Nul : Boolean := True) return char16_array;

   pragma Ada_05 (To_C);

   function To_Ada

     (Item     : char16_array;

      Trim_Nul : Boolean := True) return Wide_String;

   pragma Ada_05 (To_Ada);

   procedure To_C

     (Item       : Wide_String;

      Target     : out char16_array;

      Count      : out size_t;

      Append_Nul : Boolean := True);

   pragma Ada_05 (To_C);

   procedure To_Ada

     (Item     : char16_array;

      Target   : out Wide_String;

      Count    : out Natural;

      Trim_Nul : Boolean := True);

   pragma Ada_05 (To_Ada);

   type char32_t is new Wide_Wide_Character;

   pragma Ada_05 (char32_t);

   char32_nul : constant char32_t := char32_t'Val (0);

   pragma Ada_05 (char32_nul);

   function To_C (Item : Wide_Wide_Character) return char32_t;

   pragma Ada_05 (To_C);

   function To_Ada (Item : char32_t) return Wide_Wide_Character;

   pragma Ada_05 (To_Ada);

   type char32_array is array (size_t range <>) of aliased char32_t;

   pragma Ada_05 (char32_array);

   function Is_Nul_Terminated (Item : char32_array) return Boolean;

   pragma Ada_05 (Is_Nul_Terminated);

   function To_C

     (Item       : Wide_Wide_String;

      Append_Nul : Boolean := True) return char32_array;

   pragma Ada_05 (To_C);

   function To_Ada

     (Item     : char32_array;

      Trim_Nul : Boolean := True) return Wide_Wide_String;

   pragma Ada_05 (To_Ada);

   procedure To_C

     (Item       : Wide_Wide_String;

      Target     : out char32_array;

      Count      : out size_t;

      Append_Nul : Boolean := True);

   pragma Ada_05 (To_C);

   procedure To_Ada

     (Item     : char32_array;

      Target   : out Wide_Wide_String;

      Count    : out Natural;

      Trim_Nul : Boolean := True);

   pragma Ada_05 (To_Ada);

end Interfaces.C;