/usr/lib/hugs/packages/base/Data/Array/IO.hs is in libhugs-base-bundled 98.200609.21-5.3ubuntu1.
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-----------------------------------------------------------------------------
-- |
-- Module : Data.Array.IO
-- Copyright : (c) The University of Glasgow 2001
-- License : BSD-style (see the file libraries/base/LICENSE)
--
-- Maintainer : libraries@haskell.org
-- Stability : experimental
-- Portability : non-portable (uses Data.Array.MArray)
--
-- Mutable boxed and unboxed arrays in the IO monad.
--
-----------------------------------------------------------------------------
module Data.Array.IO (
-- * @IO@ arrays with boxed elements
IOArray, -- instance of: Eq, Typeable
-- * @IO@ arrays with unboxed elements
IOUArray, -- instance of: Eq, Typeable
castIOUArray, -- :: IOUArray i a -> IO (IOUArray i b)
-- * Overloaded mutable array interface
module Data.Array.MArray,
-- * Doing I\/O with @IOUArray@s
hGetArray, -- :: Handle -> IOUArray Int Word8 -> Int -> IO Int
hPutArray, -- :: Handle -> IOUArray Int Word8 -> Int -> IO ()
) where
import Prelude
import Data.Array.Base
import Data.Array.IO.Internals
import Data.Array ( Array )
import Data.Array.MArray
import Data.Int
import Data.Word
import Data.Char
import System.IO
import System.IO.Error
hGetArray :: Handle -> IOUArray Int Word8 -> Int -> IO Int
hGetArray handle arr count = do
bds <- getBounds arr
if count < 0 || count > rangeSize bds
then illegalBufferSize handle "hGetArray" count
else get 0
where
get i | i == count = return i
| otherwise = do
error_or_c <- try (hGetChar handle)
case error_or_c of
Left ex
| isEOFError ex -> return i
| otherwise -> ioError ex
Right c -> do
unsafeWrite arr i (fromIntegral (ord c))
get (i+1)
hPutArray :: Handle -> IOUArray Int Word8 -> Int -> IO ()
hPutArray handle arr count = do
bds <- getBounds arr
if count < 0 || count > rangeSize bds
then illegalBufferSize handle "hPutArray" count
else put 0
where
put i | i == count = return ()
| otherwise = do
w <- unsafeRead arr i
hPutChar handle (chr (fromIntegral w))
put (i+1)
illegalBufferSize :: Handle -> String -> Int -> IO a
illegalBufferSize _ fn sz = ioError $
userError (fn ++ ": illegal buffer size " ++ showsPrec 9 (sz::Int) [])
|