+#endif
+
+{-# RULES
+"realToFrac/a->CFloat" realToFrac = \x -> CFloat (realToFrac x)
+"realToFrac/a->CDouble" realToFrac = \x -> CDouble (realToFrac x)
+
+"realToFrac/CFloat->a" realToFrac = \(CFloat x) -> realToFrac x
+"realToFrac/CDouble->a" realToFrac = \(CDouble x) -> realToFrac x
+ #-}
+
+-- GHC doesn't support CLDouble yet
+-- "realToFrac/a->CLDouble" realToFrac = \x -> CLDouble (realToFrac x)
+-- "realToFrac/CLDouble->a" realToFrac = \(CLDouble x) -> realToFrac x
+
+-- | Haskell type representing the C @ptrdiff_t@ type.
+INTEGRAL_TYPE(CPtrdiff,tyConCPtrdiff,"CPtrdiff",HTYPE_PTRDIFF_T)
+-- | Haskell type representing the C @size_t@ type.
+INTEGRAL_TYPE(CSize,tyConCSize,"CSize",HTYPE_SIZE_T)
+-- | Haskell type representing the C @wchar_t@ type.
+INTEGRAL_TYPE(CWchar,tyConCWchar,"CWchar",HTYPE_WCHAR_T)
+-- | Haskell type representing the C @sig_atomic_t@ type.
+INTEGRAL_TYPE(CSigAtomic,tyConCSigAtomic,"CSigAtomic",HTYPE_SIG_ATOMIC_T)
+
+{-# RULES
+"fromIntegral/a->CPtrdiff" fromIntegral = \x -> CPtrdiff (fromIntegral x)
+"fromIntegral/a->CSize" fromIntegral = \x -> CSize (fromIntegral x)
+"fromIntegral/a->CWchar" fromIntegral = \x -> CWchar (fromIntegral x)
+"fromIntegral/a->CSigAtomic" fromIntegral = \x -> CSigAtomic (fromIntegral x)
+
+"fromIntegral/CPtrdiff->a" fromIntegral = \(CPtrdiff x) -> fromIntegral x
+"fromIntegral/CSize->a" fromIntegral = \(CSize x) -> fromIntegral x
+"fromIntegral/CWchar->a" fromIntegral = \(CWchar x) -> fromIntegral x
+"fromIntegral/CSigAtomic->a" fromIntegral = \(CSigAtomic x) -> fromIntegral x
+ #-}
+
+-- | Haskell type representing the C @clock_t@ type.
+ARITHMETIC_TYPE(CClock,tyConCClock,"CClock",HTYPE_CLOCK_T)
+-- | Haskell type representing the C @time_t@ type.
+--
+ARITHMETIC_TYPE(CTime,tyConCTime,"CTime",HTYPE_TIME_T)
+
+-- FIXME: Implement and provide instances for Eq and Storable
+-- | Haskell type representing the C @FILE@ type.
+data CFile = CFile
+-- | Haskell type representing the C @fpos_t@ type.
+data CFpos = CFpos
+-- | Haskell type representing the C @jmp_buf@ type.
+data CJmpBuf = CJmpBuf
+
+INTEGRAL_TYPE(CIntPtr,tyConCIntPtr,"CIntPtr",HTYPE_INTPTR_T)
+INTEGRAL_TYPE(CUIntPtr,tyConCUIntPtr,"CUIntPtr",HTYPE_UINTPTR_T)
+INTEGRAL_TYPE(CIntMax,tyConCIntMax,"CIntMax",HTYPE_INTMAX_T)
+INTEGRAL_TYPE(CUIntMax,tyConCUIntMax,"CUIntMax",HTYPE_UINTMAX_T)
+
+{-# RULES
+"fromIntegral/a->CIntPtr" fromIntegral = \x -> CIntPtr (fromIntegral x)
+"fromIntegral/a->CUIntPtr" fromIntegral = \x -> CUIntPtr (fromIntegral x)
+"fromIntegral/a->CIntMax" fromIntegral = \x -> CIntMax (fromIntegral x)
+"fromIntegral/a->CUIntMax" fromIntegral = \x -> CUIntMax (fromIntegral x)
+ #-}
+
+-- C99 types which are still missing include:
+-- wint_t, wctrans_t, wctype_t
+
+{- $ctypes
+
+These types are needed to accurately represent C function prototypes,
+in order to access C library interfaces in Haskell. The Haskell system
+is not required to represent those types exactly as C does, but the
+following guarantees are provided concerning a Haskell type @CT@
+representing a C type @t@:
+
+* If a C function prototype has @t@ as an argument or result type, the
+ use of @CT@ in the corresponding position in a foreign declaration
+ permits the Haskell program to access the full range of values encoded
+ by the C type; and conversely, any Haskell value for @CT@ has a valid
+ representation in C.
+
+* @'sizeOf' ('Prelude.undefined' :: CT)@ will yield the same value as
+ @sizeof (t)@ in C.
+
+* @'alignment' ('Prelude.undefined' :: CT)@ matches the alignment
+ constraint enforced by the C implementation for @t@.
+
+* The members 'peek' and 'poke' of the 'Storable' class map all values
+ of @CT@ to the corresponding value of @t@ and vice versa.
+
+* When an instance of 'Prelude.Bounded' is defined for @CT@, the values
+ of 'Prelude.minBound' and 'Prelude.maxBound' coincide with @t_MIN@
+ and @t_MAX@ in C.
+
+* When an instance of 'Prelude.Eq' or 'Prelude.Ord' is defined for @CT@,
+ the predicates defined by the type class implement the same relation
+ as the corresponding predicate in C on @t@.
+
+* When an instance of 'Prelude.Num', 'Prelude.Read', 'Prelude.Integral',
+ 'Prelude.Fractional', 'Prelude.Floating', 'Prelude.RealFrac', or
+ 'Prelude.RealFloat' is defined for @CT@, the arithmetic operations
+ defined by the type class implement the same function as the
+ corresponding arithmetic operations (if available) in C on @t@.
+
+* When an instance of 'Bits' is defined for @CT@, the bitwise operation
+ defined by the type class implement the same function as the
+ corresponding bitwise operation in C on @t@.
+
+-}
+
+#else /* __NHC__ */
+
+import NHC.FFI
+ ( CChar(..), CSChar(..), CUChar(..)
+ , CShort(..), CUShort(..), CInt(..), CUInt(..)
+ , CLong(..), CULong(..), CLLong(..), CULLong(..)
+ , CPtrdiff(..), CSize(..), CWchar(..), CSigAtomic(..)
+ , CClock(..), CTime(..)
+ , CFloat(..), CDouble(..), CLDouble(..)
+ , CIntPtr(..), CUIntPtr(..),CIntMax(..), CUIntMax(..)
+ , CFile, CFpos, CJmpBuf
+ , Storable(..)
+ )
+import Data.Bits
+import NHC.SizedTypes
+
+#define INSTANCE_BITS(T) \
+instance Bits T where { \
+ (T x) .&. (T y) = T (x .&. y) ; \
+ (T x) .|. (T y) = T (x .|. y) ; \
+ (T x) `xor` (T y) = T (x `xor` y) ; \
+ complement (T x) = T (complement x) ; \
+ shift (T x) n = T (shift x n) ; \
+ rotate (T x) n = T (rotate x n) ; \
+ bit n = T (bit n) ; \
+ setBit (T x) n = T (setBit x n) ; \
+ clearBit (T x) n = T (clearBit x n) ; \
+ complementBit (T x) n = T (complementBit x n) ; \
+ testBit (T x) n = testBit x n ; \
+ bitSize (T x) = bitSize x ; \
+ isSigned (T x) = isSigned x }
+
+INSTANCE_BITS(CChar)
+INSTANCE_BITS(CSChar)
+INSTANCE_BITS(CUChar)
+INSTANCE_BITS(CShort)
+INSTANCE_BITS(CUShort)
+INSTANCE_BITS(CInt)
+INSTANCE_BITS(CUInt)
+INSTANCE_BITS(CLong)
+INSTANCE_BITS(CULong)
+INSTANCE_BITS(CLLong)
+INSTANCE_BITS(CULLong)
+INSTANCE_BITS(CPtrdiff)
+INSTANCE_BITS(CWchar)
+INSTANCE_BITS(CSigAtomic)
+INSTANCE_BITS(CSize)
+INSTANCE_BITS(CIntPtr)
+INSTANCE_BITS(CUIntPtr)
+INSTANCE_BITS(CIntMax)
+INSTANCE_BITS(CUIntMax)