    {-# LANGUAGE CPP, ForeignFunctionInterface, MagicHash, TypeFamilies,
                 UnliftedFFITypes #-}

    -- |
    -- Module      : Data.Double.Conversion.FFI
    -- Copyright   : (c) 2011 MailRank, Inc.
    --
    -- License     : BSD-style
    -- Maintainer  : bos@serpentine.com
    -- Stability   : experimental
    -- Portability : GHC
    --
    -- FFI interface support for converting between
    -- floating point values and text.

    module Data.Double.Conversion.Internal.FFI
        (
          ForeignFloating
        , c_Text_ToExponential
        , c_Text_ToExponentialFloat
        , c_Text_ToFixed
        , c_Text_ToFixedFloat
        , c_Text_ToPrecision
        , c_Text_ToPrecisionFloat
        , c_Text_ToShortest
        , c_Text_ToShortestFloat
        , c_ToExponentialLength
        , c_ToFixedLength
        , c_ToPrecisionLength
        , c_ToShortestLength
        , c_ToExponential
        , c_ToExponentialFloat
        , c_ToFixed
        , c_ToFixedFloat
        , c_ToPrecision
        , c_ToPrecisionFloat
        , c_ToShortest
        , c_ToShortestFloat
        ) where

    import Data.Word (Word8)
    #if __GLASGOW_HASKELL__ >= 703
    import Foreign.C.Types (CDouble(CDouble), CFloat(CFloat), CInt(CInt))
    #else
    import Foreign.C.Types (CDouble, CFloat, CInt)
    #endif
    import Foreign.Ptr (Ptr)
    import GHC.Prim (MutableByteArray#)

    type family ForeignFloating h :: *

    type instance ForeignFloating Double = CDouble
    type instance ForeignFloating Float = CFloat

    foreign import ccall unsafe "hs-double-conversion.h _hs_ToShortestLength"
        c_ToShortestLength :: CInt

    foreign import ccall unsafe "hs-double-conversion.h _hs_ToShortest"
        c_ToShortest :: CDouble -> Ptr Word8 -> IO CInt

    foreign import ccall unsafe "hs-double-conversion.h _hs_ToShortestFloat"
        c_ToShortestFloat :: CFloat -> Ptr Word8 -> IO CInt

    foreign import ccall unsafe "hs-double-conversion.h _hs_ToFixedLength"
        c_ToFixedLength :: CInt

    foreign import ccall unsafe "hs-double-conversion.h _hs_ToFixed"
        c_ToFixed :: CDouble -> Ptr Word8 -> CInt -> IO CInt

    foreign import ccall unsafe "hs-double-conversion.h _hs_ToFixedFloat"
        c_ToFixedFloat :: CFloat -> Ptr Word8 -> CInt -> IO CInt

    foreign import ccall unsafe "hs-double-conversion.h _hs_ToExponentialLength"
        c_ToExponentialLength :: CInt

    foreign import ccall unsafe "hs-double-conversion.h _hs_ToExponential"
        c_ToExponential :: CDouble -> Ptr Word8 -> CInt -> IO CInt

    foreign import ccall unsafe "hs-double-conversion.h _hs_ToExponentialFloat"
        c_ToExponentialFloat :: CFloat -> Ptr Word8 -> CInt -> IO CInt

    foreign import ccall unsafe "hs-double-conversion.h _hs_ToPrecisionLength"
        c_ToPrecisionLength :: CInt

    foreign import ccall unsafe "hs-double-conversion.h _hs_ToPrecision"
        c_ToPrecision :: CDouble -> Ptr Word8 -> CInt -> IO CInt

    foreign import ccall unsafe "hs-double-conversion.h _hs_ToPrecisionFloat"
        c_ToPrecisionFloat :: CFloat -> Ptr Word8 -> CInt -> IO CInt

    #if MIN_VERSION_text(2,0,0)
    foreign import ccall unsafe "hs-double-conversion.h _hs_ToShortest"
        c_Text_ToShortest :: CDouble -> MutableByteArray# s -> IO CInt
    foreign import ccall unsafe "hs-double-conversion.h _hs_ToShortestFloat"
        c_Text_ToShortestFloat :: CFloat -> MutableByteArray# s -> IO CInt
    foreign import ccall unsafe "hs-double-conversion.h _hs_ToFixed"
        c_Text_ToFixed :: CDouble -> MutableByteArray# s -> CInt -> IO CInt
    foreign import ccall unsafe "hs-double-conversion.h _hs_ToFixedFloat"
        c_Text_ToFixedFloat :: CFloat -> MutableByteArray# s-> CInt -> IO CInt
    foreign import ccall unsafe "hs-double-conversion.h _hs_ToExponential"
        c_Text_ToExponential :: CDouble -> MutableByteArray# s -> CInt -> IO CInt
    foreign import ccall unsafe "hs-double-conversion.h _hs_ToExponentialFloat"
        c_Text_ToExponentialFloat :: CFloat -> MutableByteArray# s -> CInt -> IO CInt
    foreign import ccall unsafe "hs-double-conversion.h _hs_ToPrecision"
        c_Text_ToPrecision :: CDouble -> MutableByteArray# s -> CInt -> IO CInt
    foreign import ccall unsafe "hs-double-conversion.h _hs_ToPrecisionFloat"
        c_Text_ToPrecisionFloat :: CFloat -> MutableByteArray# s -> CInt -> IO CInt
    #else
    foreign import ccall unsafe "hs-double-conversion.h _hs_Text_ToShortest"
        c_Text_ToShortest :: CDouble -> MutableByteArray# s -> IO CInt
    foreign import ccall unsafe "hs-double-conversion.h _hs_Text_ToShortestFloat"
        c_Text_ToShortestFloat :: CFloat -> MutableByteArray# s -> IO CInt
    foreign import ccall unsafe "hs-double-conversion.h _hs_Text_ToFixed"
        c_Text_ToFixed :: CDouble -> MutableByteArray# s -> CInt -> IO CInt
    foreign import ccall unsafe "hs-double-conversion.h _hs_Text_ToFixedFloat"
        c_Text_ToFixedFloat :: CFloat -> MutableByteArray# s -> CInt -> IO CInt
    foreign import ccall unsafe "hs-double-conversion.h _hs_Text_ToExponential"
        c_Text_ToExponential :: CDouble -> MutableByteArray# s -> CInt -> IO CInt
    foreign import ccall unsafe "hs-double-conversion.h _hs_Text_ToExponentialFloat"
        c_Text_ToExponentialFloat :: CFloat -> MutableByteArray# s -> CInt -> IO CInt
    foreign import ccall unsafe "hs-double-conversion.h _hs_Text_ToPrecision"
        c_Text_ToPrecision :: CDouble -> MutableByteArray# s -> CInt -> IO CInt
    foreign import ccall unsafe "hs-double-conversion.h _hs_Text_ToPrecisionFloat"
        c_Text_ToPrecisionFloat :: CFloat -> MutableByteArray# s -> CInt -> IO CInt
    #endif