{-# LANGUAGE CPP, ForeignFunctionInterface, BangPatterns #-}
{-# LANGUAGE UnliftedFFITypes, MagicHash,
            UnboxedTuples, DeriveDataTypeable #-}
#if __GLASGOW_HASKELL__ >= 703
{-# LANGUAGE Unsafe #-}
#endif
{-# OPTIONS_HADDOCK hide #-}

-- |
-- Module      : Data.ByteString.Internal
-- Copyright   : (c) Don Stewart 2006-2008
--               (c) Duncan Coutts 2006-2012
-- License     : BSD-style
-- Maintainer  : [email protected], [email protected]
-- Stability   : unstable
-- Portability : non-portable
--
-- A module containing semi-public 'ByteString' internals. This exposes the
-- 'ByteString' representation and low level construction functions. As such
-- all the functions in this module are unsafe. The API is also not stable.
--
-- Where possible application should instead use the functions from the normal
-- public interface modules, such as "Data.ByteString.Unsafe". Packages that
-- extend the ByteString system at a low level will need to use this module.
--
module Data.ByteString.Internal (

        -- * The @ByteString@ type and representation
        ByteString(..),         -- instances: Eq, Ord, Show, Read, Data, Typeable

        -- * Conversion with lists: packing and unpacking
        packBytes, packUptoLenBytes, unsafePackLenBytes,
        packChars, packUptoLenChars, unsafePackLenChars,
        unpackBytes, unpackAppendBytesLazy, unpackAppendBytesStrict,
        unpackChars, unpackAppendCharsLazy, unpackAppendCharsStrict,
        unsafePackAddress,
        checkedSum,

        -- * Low level imperative construction
        create,                 -- :: Int -> (Ptr Word8 -> IO ()) -> IO ByteString
        createUptoN,            -- :: Int -> (Ptr Word8 -> IO Int) -> IO ByteString
        createAndTrim,          -- :: Int -> (Ptr Word8 -> IO Int) -> IO  ByteString
        createAndTrim',         -- :: Int -> (Ptr Word8 -> IO (Int, Int, a)) -> IO (ByteString, a)
        unsafeCreate,           -- :: Int -> (Ptr Word8 -> IO ()) ->  ByteString
        unsafeCreateUptoN,      -- :: Int -> (Ptr Word8 -> IO Int) ->  ByteString
        mallocByteString,       -- :: Int -> IO (ForeignPtr a)

        -- * Conversion to and from ForeignPtrs
        fromForeignPtr,         -- :: ForeignPtr Word8 -> Int -> Int -> ByteString
        toForeignPtr,           -- :: ByteString -> (ForeignPtr Word8, Int, Int)

        -- * Utilities
        nullForeignPtr,         -- :: ForeignPtr Word8

        -- * Standard C Functions
        c_strlen,               -- :: CString -> IO CInt
        c_free_finalizer,       -- :: FunPtr (Ptr Word8 -> IO ())

        memchr,                 -- :: Ptr Word8 -> Word8 -> CSize -> IO Ptr Word8
        memcmp,                 -- :: Ptr Word8 -> Ptr Word8 -> Int -> IO CInt
        memcpy,                 -- :: Ptr Word8 -> Ptr Word8 -> Int -> IO ()
        memset,                 -- :: Ptr Word8 -> Word8 -> CSize -> IO (Ptr Word8)

        -- * cbits functions
        c_reverse,              -- :: Ptr Word8 -> Ptr Word8 -> CInt -> IO ()
        c_intersperse,          -- :: Ptr Word8 -> Ptr Word8 -> CInt -> Word8 -> IO ()
        c_maximum,              -- :: Ptr Word8 -> CInt -> IO Word8
        c_minimum,              -- :: Ptr Word8 -> CInt -> IO Word8
        c_count,                -- :: Ptr Word8 -> CInt -> Word8 -> IO CInt

        -- * Chars
        w2c, c2w, isSpaceWord8, isSpaceChar8,

        -- * Deprecated and unmentionable
        accursedUnutterablePerformIO, -- :: IO a -> a
        inlinePerformIO               -- :: IO a -> a
  ) where

import Prelude hiding (concat)
import qualified Data.List as List

import Foreign.ForeignPtr       (ForeignPtr, withForeignPtr)
import Foreign.Ptr              (Ptr, FunPtr, plusPtr)
import Foreign.Storable         (Storable(..))
#if MIN_VERSION_base(4,5,0) || __GLASGOW_HASKELL__ >= 703
import Foreign.C.Types          (CInt(..), CSize(..), CULong(..))
#else
import Foreign.C.Types          (CInt, CSize, CULong)
#endif
import Foreign.C.String         (CString)

#if MIN_VERSION_base(4,9,0)
import Data.Semigroup           (Semigroup((<>)))
#endif
#if !(MIN_VERSION_base(4,8,0))
import Data.Monoid              (Monoid(..))
#endif
import Control.DeepSeq          (NFData(rnf))

import Data.String              (IsString(..))

import Control.Exception        (assert)

import Data.Char                (ord)
import Data.Word                (Word8)

import Data.Typeable            (Typeable)
import Data.Data                (Data(..), mkNoRepType)

import GHC.Base                 (realWorld#,unsafeChr)
#if MIN_VERSION_base(4,4,0)
import GHC.CString              (unpackCString#)
#else
import GHC.Base                 (unpackCString#)
#endif
import GHC.Prim                 (Addr#)
#if __GLASGOW_HASKELL__ >= 611
import GHC.IO                   (IO(IO))
#else
import GHC.IOBase               (IO(IO),RawBuffer)
#endif
#if __GLASGOW_HASKELL__ >= 611
import GHC.IO                   (unsafeDupablePerformIO)
#else
import GHC.IOBase               (unsafeDupablePerformIO)
#endif

import GHC.Base                 (nullAddr#)
import GHC.ForeignPtr           (ForeignPtr(ForeignPtr)
                                ,newForeignPtr_, mallocPlainForeignPtrBytes)
import GHC.Ptr                  (Ptr(..), castPtr)

-- CFILES stuff is Hugs only
{-# CFILES cbits/fpstring.c #-}

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

-- | A space-efficient representation of a 'Word8' vector, supporting many
-- efficient operations.
--
-- A 'ByteString' contains 8-bit bytes, or by using the operations from
-- "Data.ByteString.Char8" it can be interpreted as containing 8-bit
-- characters.
--
data ByteString = PS {-# UNPACK #-} !(ForeignPtr Word8) -- payload
                     {-# UNPACK #-} !Int                -- offset
                     {-# UNPACK #-} !Int                -- length
    deriving (Typeable)

instance Eq  ByteString where
    (==)    = eq

instance Ord ByteString where
    compare = compareBytes

#if MIN_VERSION_base(4,9,0)
instance Semigroup ByteString where
    (<>)    = append
#endif

instance Monoid ByteString where
    mempty  = PS nullForeignPtr 0 0
#if MIN_VERSION_base(4,9,0)
    mappend = (<>)
#else
    mappend = append
#endif
    mconcat = concat

instance NFData ByteString where
    rnf (PS _ _ _) = ()

instance Show ByteString where
    showsPrec p ps r = showsPrec p (unpackChars ps) r

instance Read ByteString where
    readsPrec p str = [ (packChars x, y) | (x, y) <- readsPrec p str ]

instance IsString ByteString where
    fromString = packChars

instance Data ByteString where
  gfoldl f z txt = z packBytes `f` (unpackBytes txt)
  toConstr _     = error "Data.ByteString.ByteString.toConstr"
  gunfold _ _    = error "Data.ByteString.ByteString.gunfold"
  dataTypeOf _   = mkNoRepType "Data.ByteString.ByteString"

------------------------------------------------------------------------
-- Packing and unpacking from lists

packBytes :: [Word8] -> ByteString
packBytes ws = unsafePackLenBytes (List.length ws) ws

packChars :: [Char] -> ByteString
packChars cs = unsafePackLenChars (List.length cs) cs

{-# INLINE [0] packChars #-}

{-# RULES
"ByteString packChars/packAddress" forall s .
   packChars (unpackCString# s) = accursedUnutterablePerformIO (unsafePackAddress s)
 #-}

unsafePackLenBytes :: Int -> [Word8] -> ByteString
unsafePackLenBytes len xs0 =
    unsafeCreate len $ \p -> go p xs0
  where
    go !_ []     = return ()
    go !p (x:xs) = poke p x >> go (p `plusPtr` 1) xs

unsafePackLenChars :: Int -> [Char] -> ByteString
unsafePackLenChars len cs0 =
    unsafeCreate len $ \p -> go p cs0
  where
    go !_ []     = return ()
    go !p (c:cs) = poke p (c2w c) >> go (p `plusPtr` 1) cs


-- | /O(n)/ Pack a null-terminated sequence of bytes, pointed to by an
-- Addr\# (an arbitrary machine address assumed to point outside the
-- garbage-collected heap) into a @ByteString@. A much faster way to
-- create an Addr\# is with an unboxed string literal, than to pack a
-- boxed string. A unboxed string literal is compiled to a static @char
-- []@ by GHC. Establishing the length of the string requires a call to
-- @strlen(3)@, so the Addr# must point to a null-terminated buffer (as
-- is the case with "string"# literals in GHC). Use 'unsafePackAddressLen'
-- if you know the length of the string statically.
--
-- An example:
--
-- > literalFS = unsafePackAddress "literal"#
--
-- This function is /unsafe/. If you modify the buffer pointed to by the
-- original Addr# this modification will be reflected in the resulting
-- @ByteString@, breaking referential transparency.
--
-- Note this also won't work if your Addr# has embedded '\0' characters in
-- the string, as @strlen@ will return too short a length.
--
unsafePackAddress :: Addr# -> IO ByteString
unsafePackAddress addr# = do
    p <- newForeignPtr_ (castPtr cstr)
    l <- c_strlen cstr
    return $ PS p 0 (fromIntegral l)
  where
    cstr :: CString
    cstr = Ptr addr#
{-# INLINE unsafePackAddress #-}


packUptoLenBytes :: Int -> [Word8] -> (ByteString, [Word8])
packUptoLenBytes len xs0 =
    unsafeCreateUptoN' len $ \p -> go p len xs0
  where
    go !_ !n []     = return (len-n, [])
    go !_ !0 xs     = return (len,   xs)
    go !p !n (x:xs) = poke p x >> go (p `plusPtr` 1) (n-1) xs

packUptoLenChars :: Int -> [Char] -> (ByteString, [Char])
packUptoLenChars len cs0 =
    unsafeCreateUptoN' len $ \p -> go p len cs0
  where
    go !_ !n []     = return (len-n, [])
    go !_ !0 cs     = return (len,   cs)
    go !p !n (c:cs) = poke p (c2w c) >> go (p `plusPtr` 1) (n-1) cs

-- Unpacking bytestrings into lists effeciently is a tradeoff: on the one hand
-- we would like to write a tight loop that just blats the list into memory, on
-- the other hand we want it to be unpacked lazily so we don't end up with a
-- massive list data structure in memory.
--
-- Our strategy is to combine both: we will unpack lazily in reasonable sized
-- chunks, where each chunk is unpacked strictly.
--
-- unpackBytes and unpackChars do the lazy loop, while unpackAppendBytes and
-- unpackAppendChars do the chunks strictly.

unpackBytes :: ByteString -> [Word8]
unpackBytes bs = unpackAppendBytesLazy bs []

unpackChars :: ByteString -> [Char]
unpackChars bs = unpackAppendCharsLazy bs []

unpackAppendBytesLazy :: ByteString -> [Word8] -> [Word8]
unpackAppendBytesLazy (PS fp off len) xs
  | len <= 100 = unpackAppendBytesStrict (PS fp off len) xs
  | otherwise  = unpackAppendBytesStrict (PS fp off 100) remainder
  where
    remainder  = unpackAppendBytesLazy (PS fp (off+100) (len-100)) xs

  -- Why 100 bytes you ask? Because on a 64bit machine the list we allocate
  -- takes just shy of 4k which seems like a reasonable amount.
  -- (5 words per list element, 8 bytes per word, 100 elements = 4000 bytes)

unpackAppendCharsLazy :: ByteString -> [Char] -> [Char]
unpackAppendCharsLazy (PS fp off len) cs
  | len <= 100 = unpackAppendCharsStrict (PS fp off len) cs
  | otherwise  = unpackAppendCharsStrict (PS fp off 100) remainder
  where
    remainder  = unpackAppendCharsLazy (PS fp (off+100) (len-100)) cs

-- For these unpack functions, since we're unpacking the whole list strictly we
-- build up the result list in an accumulator. This means we have to build up
-- the list starting at the end. So our traversal starts at the end of the
-- buffer and loops down until we hit the sentinal:

unpackAppendBytesStrict :: ByteString -> [Word8] -> [Word8]
unpackAppendBytesStrict (PS fp off len) xs =
    accursedUnutterablePerformIO $ withForeignPtr fp $ \base -> do
      loop (base `plusPtr` (off-1)) (base `plusPtr` (off-1+len)) xs
  where
    loop !sentinal !p acc
      | p == sentinal = return acc
      | otherwise     = do x <- peek p
                           loop sentinal (p `plusPtr` (-1)) (x:acc)

unpackAppendCharsStrict :: ByteString -> [Char] -> [Char]
unpackAppendCharsStrict (PS fp off len) xs =
    accursedUnutterablePerformIO $ withForeignPtr fp $ \base ->
      loop (base `plusPtr` (off-1)) (base `plusPtr` (off-1+len)) xs
  where
    loop !sentinal !p acc
      | p == sentinal = return acc
      | otherwise     = do x <- peek p
                           loop sentinal (p `plusPtr` (-1)) (w2c x:acc)

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

-- | The 0 pointer. Used to indicate the empty Bytestring.
nullForeignPtr :: ForeignPtr Word8
nullForeignPtr = ForeignPtr nullAddr# (error "nullForeignPtr") --TODO: should ForeignPtrContents be strict?

-- ---------------------------------------------------------------------
-- Low level constructors

-- | /O(1)/ Build a ByteString from a ForeignPtr.
--
-- If you do not need the offset parameter then you do should be using
-- 'Data.ByteString.Unsafe.unsafePackCStringLen' or
-- 'Data.ByteString.Unsafe.unsafePackCStringFinalizer' instead.
--
fromForeignPtr :: ForeignPtr Word8
               -> Int -- ^ Offset
               -> Int -- ^ Length
               -> ByteString
fromForeignPtr fp s l = PS fp s l
{-# INLINE fromForeignPtr #-}

-- | /O(1)/ Deconstruct a ForeignPtr from a ByteString
toForeignPtr :: ByteString -> (ForeignPtr Word8, Int, Int) -- ^ (ptr, offset, length)
toForeignPtr (PS ps s l) = (ps, s, l)
{-# INLINE toForeignPtr #-}

-- | A way of creating ByteStrings outside the IO monad. The @Int@
-- argument gives the final size of the ByteString.
unsafeCreate :: Int -> (Ptr Word8 -> IO ()) -> ByteString
unsafeCreate l f = unsafeDupablePerformIO (create l f)
{-# INLINE unsafeCreate #-}

-- | Like 'unsafeCreate' but instead of giving the final size of the
-- ByteString, it is just an upper bound. The inner action returns
-- the actual size. Unlike 'createAndTrim' the ByteString is not
-- reallocated if the final size is less than the estimated size.
unsafeCreateUptoN :: Int -> (Ptr Word8 -> IO Int) -> ByteString
unsafeCreateUptoN l f = unsafeDupablePerformIO (createUptoN l f)
{-# INLINE unsafeCreateUptoN #-}

unsafeCreateUptoN' :: Int -> (Ptr Word8 -> IO (Int, a)) -> (ByteString, a)
unsafeCreateUptoN' l f = unsafeDupablePerformIO (createUptoN' l f)
{-# INLINE unsafeCreateUptoN' #-}

-- | Create ByteString of size @l@ and use action @f@ to fill it's contents.
create :: Int -> (Ptr Word8 -> IO ()) -> IO ByteString
create l f = do
    fp <- mallocByteString l
    withForeignPtr fp $ \p -> f p
    return $! PS fp 0 l
{-# INLINE create #-}

-- | Create ByteString of up to size size @l@ and use action @f@ to fill it's
-- contents which returns its true size.
createUptoN :: Int -> (Ptr Word8 -> IO Int) -> IO ByteString
createUptoN l f = do
    fp <- mallocByteString l
    l' <- withForeignPtr fp $ \p -> f p
    assert (l' <= l) $ return $! PS fp 0 l'
{-# INLINE createUptoN #-}

-- | Create ByteString of up to size @l@ and use action @f@ to fill it's contents which returns its true size.
createUptoN' :: Int -> (Ptr Word8 -> IO (Int, a)) -> IO (ByteString, a)
createUptoN' l f = do
    fp <- mallocByteString l
    (l', res) <- withForeignPtr fp $ \p -> f p
    assert (l' <= l) $ return (PS fp 0 l', res)
{-# INLINE createUptoN' #-}

-- | Given the maximum size needed and a function to make the contents
-- of a ByteString, createAndTrim makes the 'ByteString'. The generating
-- function is required to return the actual final size (<= the maximum
-- size), and the resulting byte array is realloced to this size.
--
-- createAndTrim is the main mechanism for creating custom, efficient
-- ByteString functions, using Haskell or C functions to fill the space.
--
createAndTrim :: Int -> (Ptr Word8 -> IO Int) -> IO ByteString
createAndTrim l f = do
    fp <- mallocByteString l
    withForeignPtr fp $ \p -> do
        l' <- f p
        if assert (l' <= l) $ l' >= l
            then return $! PS fp 0 l
            else create l' $ \p' -> memcpy p' p l'
{-# INLINE createAndTrim #-}

createAndTrim' :: Int -> (Ptr Word8 -> IO (Int, Int, a)) -> IO (ByteString, a)
createAndTrim' l f = do
    fp <- mallocByteString l
    withForeignPtr fp $ \p -> do
        (off, l', res) <- f p
        if assert (l' <= l) $ l' >= l
            then return $! (PS fp 0 l, res)
            else do ps <- create l' $ \p' ->
                            memcpy p' (p `plusPtr` off) l'
                    return $! (ps, res)

-- | Wrapper of 'mallocForeignPtrBytes' with faster implementation for GHC
--
mallocByteString :: Int -> IO (ForeignPtr a)
mallocByteString l = mallocPlainForeignPtrBytes l
{-# INLINE mallocByteString #-}

------------------------------------------------------------------------
-- Implementations for Eq, Ord and Monoid instances

eq :: ByteString -> ByteString -> Bool
eq a@(PS fp off len) b@(PS fp' off' len')
  | len /= len'              = False    -- short cut on length
  | fp == fp' && off == off' = True     -- short cut for the same string
  | otherwise                = compareBytes a b == EQ
{-# INLINE eq #-}
-- ^ still needed

compareBytes :: ByteString -> ByteString -> Ordering
compareBytes (PS _   _    0)    (PS _   _    0)    = EQ  -- short cut for empty strings
compareBytes (PS fp1 off1 len1) (PS fp2 off2 len2) =
    accursedUnutterablePerformIO $
      withForeignPtr fp1 $ \p1 ->
      withForeignPtr fp2 $ \p2 -> do
        i <- memcmp (p1 `plusPtr` off1) (p2 `plusPtr` off2) (min len1 len2)
        return $! case i `compare` 0 of
                    EQ  -> len1 `compare` len2
                    x   -> x

append :: ByteString -> ByteString -> ByteString
append (PS _   _    0)    b                  = b
append a                  (PS _   _    0)    = a
append (PS fp1 off1 len1) (PS fp2 off2 len2) =
    unsafeCreate (len1+len2) $ \destptr1 -> do
      let destptr2 = destptr1 `plusPtr` len1
      withForeignPtr fp1 $ \p1 -> memcpy destptr1 (p1 `plusPtr` off1) len1
      withForeignPtr fp2 $ \p2 -> memcpy destptr2 (p2 `plusPtr` off2) len2

concat :: [ByteString] -> ByteString
concat []     = mempty
concat [bs]   = bs
concat bss0   = unsafeCreate totalLen $ \ptr -> go bss0 ptr
  where
    totalLen = checkedSum "concat" [ len | (PS _ _ len) <- bss0 ]
    go []                  !_   = return ()
    go (PS fp off len:bss) !ptr = do
      withForeignPtr fp $ \p -> memcpy ptr (p `plusPtr` off) len
      go bss (ptr `plusPtr` len)

-- | Add a list of non-negative numbers.  Errors out on overflow.
checkedSum :: String -> [Int] -> Int
checkedSum fun = go 0
  where go !a (x:xs)
            | ax >= 0   = go ax xs
            | otherwise = overflowError fun
          where ax = a + x
        go a  _         = a

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

-- | Conversion between 'Word8' and 'Char'. Should compile to a no-op.
w2c :: Word8 -> Char
w2c = unsafeChr . fromIntegral
{-# INLINE w2c #-}

-- | Unsafe conversion between 'Char' and 'Word8'. This is a no-op and
-- silently truncates to 8 bits Chars > '\255'. It is provided as
-- convenience for ByteString construction.
c2w :: Char -> Word8
c2w = fromIntegral . ord
{-# INLINE c2w #-}

-- | Selects words corresponding to white-space characters in the Latin-1 range
-- ordered by frequency.
isSpaceWord8 :: Word8 -> Bool
isSpaceWord8 w =
    w == 0x20 ||
    w == 0x0A || -- LF, \n
    w == 0x09 || -- HT, \t
    w == 0x0C || -- FF, \f
    w == 0x0D || -- CR, \r
    w == 0x0B || -- VT, \v
    w == 0xA0    -- spotted by QC..
{-# INLINE isSpaceWord8 #-}

-- | Selects white-space characters in the Latin-1 range
isSpaceChar8 :: Char -> Bool
isSpaceChar8 c =
    c == ' '     ||
    c == '\t'    ||
    c == '\n'    ||
    c == '\r'    ||
    c == '\f'    ||
    c == '\v'    ||
    c == '\xa0'
{-# INLINE isSpaceChar8 #-}

overflowError :: String -> a
overflowError fun = error $ "Data.ByteString." ++ fun ++ ": size overflow"

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

-- | This \"function\" has a superficial similarity to 'unsafePerformIO' but
-- it is in fact a malevolent agent of chaos. It unpicks the seams of reality
-- (and the 'IO' monad) so that the normal rules no longer apply. It lulls you
-- into thinking it is reasonable, but when you are not looking it stabs you
-- in the back and aliases all of your mutable buffers. The carcass of many a
-- seasoned Haskell programmer lie strewn at its feet.
--
-- Witness the trail of destruction:
--
-- * <https://github.com/haskell/bytestring/commit/71c4b438c675aa360c79d79acc9a491e7bbc26e7>
--
-- * <https://github.com/haskell/bytestring/commit/210c656390ae617d9ee3b8bcff5c88dd17cef8da>
--
-- * <https://ghc.haskell.org/trac/ghc/ticket/3486>
--
-- * <https://ghc.haskell.org/trac/ghc/ticket/3487>
--
-- * <https://ghc.haskell.org/trac/ghc/ticket/7270>
--
-- Do not talk about \"safe\"! You do not know what is safe!
--
-- Yield not to its blasphemous call! Flee traveller! Flee or you will be
-- corrupted and devoured!
--
{-# INLINE accursedUnutterablePerformIO #-}
accursedUnutterablePerformIO :: IO a -> a
accursedUnutterablePerformIO (IO m) = case m realWorld# of (# _, r #) -> r

inlinePerformIO :: IO a -> a
inlinePerformIO = accursedUnutterablePerformIO
{-# INLINE inlinePerformIO #-}
{-# DEPRECATED inlinePerformIO "If you think you know what you are doing, use 'unsafePerformIO'. If you are sure you know what you are doing, use 'unsafeDupablePerformIO'. If you enjoy sharing an address space with a malevolent agent of chaos, try 'accursedUnutterablePerformIO'." #-}

-- ---------------------------------------------------------------------
--
-- Standard C functions
--

foreign import ccall unsafe "string.h strlen" c_strlen
    :: CString -> IO CSize

foreign import ccall unsafe "static stdlib.h &free" c_free_finalizer
    :: FunPtr (Ptr Word8 -> IO ())

foreign import ccall unsafe "string.h memchr" c_memchr
    :: Ptr Word8 -> CInt -> CSize -> IO (Ptr Word8)

memchr :: Ptr Word8 -> Word8 -> CSize -> IO (Ptr Word8)
memchr p w s = c_memchr p (fromIntegral w) s

foreign import ccall unsafe "string.h memcmp" c_memcmp
    :: Ptr Word8 -> Ptr Word8 -> CSize -> IO CInt

memcmp :: Ptr Word8 -> Ptr Word8 -> Int -> IO CInt
memcmp p q s = c_memcmp p q (fromIntegral s)

foreign import ccall unsafe "string.h memcpy" c_memcpy
    :: Ptr Word8 -> Ptr Word8 -> CSize -> IO (Ptr Word8)

memcpy :: Ptr Word8 -> Ptr Word8 -> Int -> IO ()
memcpy p q s = c_memcpy p q (fromIntegral s) >> return ()

{-
foreign import ccall unsafe "string.h memmove" c_memmove
    :: Ptr Word8 -> Ptr Word8 -> CSize -> IO (Ptr Word8)

memmove :: Ptr Word8 -> Ptr Word8 -> CSize -> IO ()
memmove p q s = do c_memmove p q s
                   return ()
-}

foreign import ccall unsafe "string.h memset" c_memset
    :: Ptr Word8 -> CInt -> CSize -> IO (Ptr Word8)

memset :: Ptr Word8 -> Word8 -> CSize -> IO (Ptr Word8)
memset p w s = c_memset p (fromIntegral w) s

-- ---------------------------------------------------------------------
--
-- Uses our C code
--

foreign import ccall unsafe "static fpstring.h fps_reverse" c_reverse
    :: Ptr Word8 -> Ptr Word8 -> CULong -> IO ()

foreign import ccall unsafe "static fpstring.h fps_intersperse" c_intersperse
    :: Ptr Word8 -> Ptr Word8 -> CULong -> Word8 -> IO ()

foreign import ccall unsafe "static fpstring.h fps_maximum" c_maximum
    :: Ptr Word8 -> CULong -> IO Word8

foreign import ccall unsafe "static fpstring.h fps_minimum" c_minimum
    :: Ptr Word8 -> CULong -> IO Word8

foreign import ccall unsafe "static fpstring.h fps_count" c_count
    :: Ptr Word8 -> CULong -> Word8 -> IO CULong