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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 adapted 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 (C);
-- 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 range -(2 ** (System.Parameters.long_bits - 1))
.. +(2 ** (System.Parameters.long_bits - 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 parametrized
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;
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 : in char_array) return Boolean;
function To_C
(Item : in String;
Append_Nul : in Boolean := True)
return char_array;
function To_Ada
(Item : in char_array;
Trim_Nul : in Boolean := True)
return String;
procedure To_C
(Item : in String;
Target : out char_array;
Count : out size_t;
Append_Nul : in Boolean := True);
procedure To_Ada
(Item : in char_array;
Target : out String;
Count : out Natural;
Trim_Nul : in 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 : in Wide_Character) return wchar_t;
function To_Ada (Item : in wchar_t) return Wide_Character;
type wchar_array is array (size_t range <>) of aliased wchar_t;
function Is_Nul_Terminated (Item : in wchar_array) return Boolean;
function To_C
(Item : in Wide_String;
Append_Nul : in Boolean := True)
return wchar_array;
function To_Ada
(Item : in wchar_array;
Trim_Nul : in Boolean := True)
return Wide_String;
procedure To_C
(Item : in Wide_String;
Target : out wchar_array;
Count : out size_t;
Append_Nul : in Boolean := True);
procedure To_Ada
(Item : in wchar_array;
Target : out Wide_String;
Count : out Natural;
Trim_Nul : in Boolean := True);
Terminator_Error : exception;
end Interfaces.C;
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