    {-# LANGUAGE Trustworthy #-}
    {-# LANGUAGE CPP
               , NoImplicitPrelude
               , RecordWildCards
               , NondecreasingIndentation
      #-}
    {-# OPTIONS_GHC -Wno-unused-matches #-}

    -----------------------------------------------------------------------------
    -- |
    -- Module      :  GHC.IO.Handle
    -- Copyright   :  (c) The University of Glasgow, 1994-2009
    -- License     :  see libraries/base/LICENSE
    --
    -- Maintainer  :  libraries@haskell.org
    -- Stability   :  provisional
    -- Portability :  non-portable
    --
    -- External API for GHC's Handle implementation
    --
    -----------------------------------------------------------------------------

    module GHC.IO.Handle (
       Handle,
       BufferMode(..),

       mkFileHandle, mkDuplexHandle,

       hFileSize, hSetFileSize, hIsEOF, isEOF, hLookAhead,
       hSetBuffering, hSetBinaryMode, hSetEncoding, hGetEncoding,
       hFlush, hFlushAll, hDuplicate, hDuplicateTo,

       hClose, hClose_help,

       LockMode(..), hLock, hTryLock,

       HandlePosition, HandlePosn(..), hGetPosn, hSetPosn,
       SeekMode(..), hSeek, hTell,

       hIsOpen, hIsClosed, hIsReadable, hIsWritable, hGetBuffering, hIsSeekable,
       hSetEcho, hGetEcho, hIsTerminalDevice,

       hSetNewlineMode, Newline(..), NewlineMode(..), nativeNewline,
       noNewlineTranslation, universalNewlineMode, nativeNewlineMode,

       hShow,

       hWaitForInput, hGetChar, hGetLine, hGetContents, hGetContents', hPutChar, hPutStr,

       hGetBuf, hGetBufNonBlocking, hPutBuf, hPutBufNonBlocking
     ) where

    import GHC.IO
    import GHC.IO.Exception
    import GHC.IO.Encoding
    import GHC.IO.Buffer
    import GHC.IO.BufferedIO ( BufferedIO )
    import GHC.IO.Device as IODevice
    import GHC.IO.StdHandles
    import GHC.IO.SubSystem
    import GHC.IO.Handle.Lock
    import GHC.IO.Handle.Types
    import GHC.IO.Handle.Internals
    import GHC.IO.Handle.Text
    import qualified GHC.IO.BufferedIO as Buffered

    import GHC.Base
    import GHC.Exception
    import GHC.MVar
    import GHC.IORef
    import GHC.Show
    import GHC.Num
    import GHC.Real
    import Data.Maybe
    import Data.Typeable

    -- ---------------------------------------------------------------------------
    -- Closing a handle

    -- | Computation 'hClose' @hdl@ makes handle @hdl@ closed.  Before the
    -- computation finishes, if @hdl@ is writable its buffer is flushed as
    -- for 'hFlush'.
    -- Performing 'hClose' on a handle that has already been closed has no effect;
    -- doing so is not an error.  All other operations on a closed handle will fail.
    -- If 'hClose' fails for any reason, any further operations (apart from
    -- 'hClose') on the handle will still fail as if @hdl@ had been successfully
    -- closed.
    --
    -- 'hClose' is an /interruptible operation/ in the sense described in
    -- "Control.Exception". If 'hClose' is interrupted by an asynchronous
    -- exception in the process of flushing its buffers, then the I/O device
    -- (e.g., file) will be closed anyway.
    hClose :: Handle -> IO ()
    hClose :: Handle -> IO ()
    hClose = Handle -> IO ()
    hClose_impl

    -----------------------------------------------------------------------------
    -- Detecting and changing the size of a file

    -- | For a handle @hdl@ which attached to a physical file,
    -- 'hFileSize' @hdl@ returns the size of that file in 8-bit bytes.

    hFileSize :: Handle -> IO Integer
    hFileSize :: Handle -> IO Integer
    hFileSize Handle
    handle =
        forall a. String -> Handle -> (Handle__ -> IO a) -> IO a
    withHandle_ String
    "hFileSize" Handle
    handle forall a b. (a -> b) -> a -> b
    $ \ handle_ :: Handle__
    handle_@Handle__{haDevice :: ()
    haDevice=dev
    dev} -> do
        case Handle__ -> HandleType
    haType Handle__
    handle_ of
          HandleType
    ClosedHandle              -> forall a. IO a
    ioe_closedHandle
          HandleType
    SemiClosedHandle          -> forall a. IO a
    ioe_semiclosedHandle
          HandleType
    _ -> do Handle__ -> IO ()
    flushWriteBuffer Handle__
    handle_
                  Integer
    r <- forall a. IODevice a => a -> IO Integer
    IODevice.getSize dev
    dev
                  String -> IO ()
    debugIO forall a b. (a -> b) -> a -> b
    $ String
    "hFileSize: " forall a. [a] -> [a] -> [a]
    ++ forall a. Show a => a -> String
    show Integer
    r forall a. [a] -> [a] -> [a]
    ++ String
    " " forall a. [a] -> [a] -> [a]
    ++ forall a. Show a => a -> String
    show Handle
    handle
                  if Integer
    r forall a. Eq a => a -> a -> Bool
    /= -Integer
    1
                    then forall (m :: * -> *) a. Monad m => a -> m a
    return Integer
    r
                    else forall a. IOException -> IO a
    ioException (Maybe Handle
    -> IOErrorType
    -> String
    -> String
    -> Maybe CInt
    -> Maybe String
    -> IOException
    IOError forall a. Maybe a
    Nothing IOErrorType
    InappropriateType String
    "hFileSize"
                                      String
    "not a regular file" forall a. Maybe a
    Nothing forall a. Maybe a
    Nothing)

    -- | 'hSetFileSize' @hdl@ @size@ truncates the physical file with handle @hdl@ to @size@ bytes.

    hSetFileSize :: Handle -> Integer -> IO ()
    hSetFileSize :: Handle -> Integer -> IO ()
    hSetFileSize Handle
    handle Integer
    size =
        forall a. String -> Handle -> (Handle__ -> IO a) -> IO a
    withHandle_ String
    "hSetFileSize" Handle
    handle forall a b. (a -> b) -> a -> b
    $ \ handle_ :: Handle__
    handle_@Handle__{haDevice :: ()
    haDevice=dev
    dev} -> do
        case Handle__ -> HandleType
    haType Handle__
    handle_ of
          HandleType
    ClosedHandle              -> forall a. IO a
    ioe_closedHandle
          HandleType
    SemiClosedHandle          -> forall a. IO a
    ioe_semiclosedHandle
          HandleType
    _ -> do Handle__ -> IO ()
    flushWriteBuffer Handle__
    handle_
                  forall a. IODevice a => a -> Integer -> IO ()
    IODevice.setSize dev
    dev Integer
    size
                  forall (m :: * -> *) a. Monad m => a -> m a
    return ()

    -- ---------------------------------------------------------------------------
    -- Detecting the End of Input

    -- | For a readable handle @hdl@, 'hIsEOF' @hdl@ returns
    -- 'True' if no further input can be taken from @hdl@ or for a
    -- physical file, if the current I\/O position is equal to the length of
    -- the file.  Otherwise, it returns 'False'.
    --
    -- NOTE: 'hIsEOF' may block, because it has to attempt to read from
    -- the stream to determine whether there is any more data to be read.

    hIsEOF :: Handle -> IO Bool
    hIsEOF :: Handle -> IO Bool
    hIsEOF Handle
    handle = forall a. String -> Handle -> (Handle__ -> IO a) -> IO a
    wantReadableHandle_ String
    "hIsEOF" Handle
    handle forall a b. (a -> b) -> a -> b
    $ \Handle__{dev
    Maybe (MVar Handle__)
    Maybe (TextEncoder enc_state)
    Maybe (TextDecoder dec_state)
    Maybe TextEncoding
    IORef (dec_state, Buffer Word8)
    IORef (Buffer CharBufElem)
    IORef (Buffer Word8)
    IORef (BufferList CharBufElem)
    BufferMode
    HandleType
    Newline
    haOutputNL :: Handle__ -> Newline
    haOtherSide :: Handle__ -> Maybe (MVar Handle__)
    haLastDecode :: ()
    haInputNL :: Handle__ -> Newline
    haEncoder :: ()
    haDecoder :: ()
    haCodec :: Handle__ -> Maybe TextEncoding
    haCharBuffer :: Handle__ -> IORef (Buffer CharBufElem)
    haByteBuffer :: Handle__ -> IORef (Buffer Word8)
    haBuffers :: Handle__ -> IORef (BufferList CharBufElem)
    haBufferMode :: Handle__ -> BufferMode
    haOtherSide :: Maybe (MVar Handle__)
    haOutputNL :: Newline
    haInputNL :: Newline
    haCodec :: Maybe TextEncoding
    haDecoder :: Maybe (TextDecoder dec_state)
    haEncoder :: Maybe (TextEncoder enc_state)
    haBuffers :: IORef (BufferList CharBufElem)
    haCharBuffer :: IORef (Buffer CharBufElem)
    haLastDecode :: IORef (dec_state, Buffer Word8)
    haBufferMode :: BufferMode
    haByteBuffer :: IORef (Buffer Word8)
    haType :: HandleType
    haDevice :: dev
    haType :: Handle__ -> HandleType
    haDevice :: ()
    ..} -> do

      Buffer CharBufElem
    cbuf <- forall a. IORef a -> IO a
    readIORef IORef (Buffer CharBufElem)
    haCharBuffer
      if Bool -> Bool
    not (forall e. Buffer e -> Bool
    isEmptyBuffer Buffer CharBufElem
    cbuf) then forall (m :: * -> *) a. Monad m => a -> m a
    return Bool
    False else do

      Buffer Word8
    bbuf <- forall a. IORef a -> IO a
    readIORef IORef (Buffer Word8)
    haByteBuffer
      if Bool -> Bool
    not (forall e. Buffer e -> Bool
    isEmptyBuffer Buffer Word8
    bbuf) then forall (m :: * -> *) a. Monad m => a -> m a
    return Bool
    False else do

      -- NB. do no decoding, just fill the byte buffer; see #3808
      (Int
    r,Buffer Word8
    bbuf') <- forall dev.
    BufferedIO dev =>
    dev -> Buffer Word8 -> IO (Int, Buffer Word8)
    Buffered.fillReadBuffer dev
    haDevice Buffer Word8
    bbuf
      if Int
    r forall a. Eq a => a -> a -> Bool
    == Int
    0
         then forall (m :: * -> *) a. Monad m => a -> m a
    return Bool
    True
         else do forall a. IORef a -> a -> IO ()
    writeIORef IORef (Buffer Word8)
    haByteBuffer Buffer Word8
    bbuf'
                 forall (m :: * -> *) a. Monad m => a -> m a
    return Bool
    False

    -- ---------------------------------------------------------------------------
    -- isEOF

    -- | The computation 'isEOF' is identical to 'hIsEOF',
    -- except that it works only on 'stdin'.

    isEOF :: IO Bool
    isEOF :: IO Bool
    isEOF = Handle -> IO Bool
    hIsEOF Handle
    stdin

    -- ---------------------------------------------------------------------------
    -- Looking ahead

    -- | Computation 'hLookAhead' returns the next character from the handle
    -- without removing it from the input buffer, blocking until a character
    -- is available.
    --
    -- This operation may fail with:
    --
    --  * 'System.IO.Error.isEOFError' if the end of file has been reached.

    hLookAhead :: Handle -> IO Char
    hLookAhead :: Handle -> IO CharBufElem
    hLookAhead Handle
    handle =
      forall a. String -> Handle -> (Handle__ -> IO a) -> IO a
    wantReadableHandle_ String
    "hLookAhead"  Handle
    handle Handle__ -> IO CharBufElem
    hLookAhead_

    -- ---------------------------------------------------------------------------
    -- Buffering Operations

    -- Three kinds of buffering are supported: line-buffering,
    -- block-buffering or no-buffering.  See GHC.IO.Handle for definition and
    -- further explanation of what the type represent.

    -- | Computation 'hSetBuffering' @hdl mode@ sets the mode of buffering for
    -- handle @hdl@ on subsequent reads and writes.
    --
    -- If the buffer mode is changed from 'BlockBuffering' or
    -- 'LineBuffering' to 'NoBuffering', then
    --
    --  * if @hdl@ is writable, the buffer is flushed as for 'hFlush';
    --
    --  * if @hdl@ is not writable, the contents of the buffer is discarded.
    --
    -- This operation may fail with:
    --
    --  * 'System.IO.Error.isPermissionError' if the handle has already been used
    --    for reading or writing and the implementation does not allow the
    --    buffering mode to be changed.

    hSetBuffering :: Handle -> BufferMode -> IO ()
    hSetBuffering :: Handle -> BufferMode -> IO ()
    hSetBuffering Handle
    handle BufferMode
    mode =
      String -> Handle -> (Handle__ -> IO Handle__) -> IO ()
    withAllHandles__ String
    "hSetBuffering" Handle
    handle forall a b. (a -> b) -> a -> b
    $ \ handle_ :: Handle__
    handle_@Handle__{dev
    Maybe (MVar Handle__)
    Maybe (TextEncoder enc_state)
    Maybe (TextDecoder dec_state)
    Maybe TextEncoding
    IORef (dec_state, Buffer Word8)
    IORef (Buffer CharBufElem)
    IORef (Buffer Word8)
    IORef (BufferList CharBufElem)
    BufferMode
    HandleType
    Newline
    haOtherSide :: Maybe (MVar Handle__)
    haOutputNL :: Newline
    haInputNL :: Newline
    haCodec :: Maybe TextEncoding
    haDecoder :: Maybe (TextDecoder dec_state)
    haEncoder :: Maybe (TextEncoder enc_state)
    haBuffers :: IORef (BufferList CharBufElem)
    haCharBuffer :: IORef (Buffer CharBufElem)
    haLastDecode :: IORef (dec_state, Buffer Word8)
    haBufferMode :: BufferMode
    haByteBuffer :: IORef (Buffer Word8)
    haType :: HandleType
    haDevice :: dev
    haOutputNL :: Handle__ -> Newline
    haOtherSide :: Handle__ -> Maybe (MVar Handle__)
    haLastDecode :: ()
    haInputNL :: Handle__ -> Newline
    haEncoder :: ()
    haDecoder :: ()
    haCodec :: Handle__ -> Maybe TextEncoding
    haCharBuffer :: Handle__ -> IORef (Buffer CharBufElem)
    haByteBuffer :: Handle__ -> IORef (Buffer Word8)
    haBuffers :: Handle__ -> IORef (BufferList CharBufElem)
    haBufferMode :: Handle__ -> BufferMode
    haType :: Handle__ -> HandleType
    haDevice :: ()
    ..} -> do
      case HandleType
    haType of
        HandleType
    ClosedHandle -> forall a. IO a
    ioe_closedHandle
        HandleType
    _ -> do
             if BufferMode
    mode forall a. Eq a => a -> a -> Bool
    == BufferMode
    haBufferMode then forall (m :: * -> *) a. Monad m => a -> m a
    return Handle__
    handle_ else do

             -- See [note Buffer Sizing] in GHC.IO.Handle.Types

              -- check for errors:
              case BufferMode
    mode of
                  BlockBuffering (Just Int
    n) | Int
    n forall a. Ord a => a -> a -> Bool
    <= Int
    0    -> forall a. Int -> IO a
    ioe_bufsiz Int
    n
                  BufferMode
    _ -> forall (m :: * -> *) a. Monad m => a -> m a
    return ()

              -- for input terminals we need to put the terminal into
              -- cooked or raw mode depending on the type of buffering.
              Bool
    is_tty <- forall a. IODevice a => a -> IO Bool
    IODevice.isTerminal dev
    haDevice
              forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
    when (Bool
    is_tty Bool -> Bool -> Bool
    && HandleType -> Bool
    isReadableHandleType HandleType
    haType) forall a b. (a -> b) -> a -> b
    $
                    case BufferMode
    mode of
    #if !defined(mingw32_HOST_OS)
            -- 'raw' mode under win32 is a bit too specialised (and troublesome
            -- for most common uses), so simply disable its use here when not using
            -- WinIO.
                      BufferMode
    NoBuffering -> forall a. IODevice a => a -> Bool -> IO ()
    IODevice.setRaw dev
    haDevice Bool
    True
    #else
                      NoBuffering -> return () <!> IODevice.setRaw haDevice True
    #endif
                      BufferMode
    _           -> forall a. IODevice a => a -> Bool -> IO ()
    IODevice.setRaw dev
    haDevice Bool
    False

              -- throw away spare buffers, they might be the wrong size
              forall a. IORef a -> a -> IO ()
    writeIORef IORef (BufferList CharBufElem)
    haBuffers forall e. BufferList e
    BufferListNil

              forall (m :: * -> *) a. Monad m => a -> m a
    return Handle__{ haBufferMode :: BufferMode
    haBufferMode = BufferMode
    mode,dev
    Maybe (MVar Handle__)
    Maybe (TextEncoder enc_state)
    Maybe (TextDecoder dec_state)
    Maybe TextEncoding
    IORef (dec_state, Buffer Word8)
    IORef (Buffer CharBufElem)
    IORef (Buffer Word8)
    IORef (BufferList CharBufElem)
    HandleType
    Newline
    haOtherSide :: Maybe (MVar Handle__)
    haOutputNL :: Newline
    haInputNL :: Newline
    haCodec :: Maybe TextEncoding
    haDecoder :: Maybe (TextDecoder dec_state)
    haEncoder :: Maybe (TextEncoder enc_state)
    haBuffers :: IORef (BufferList CharBufElem)
    haCharBuffer :: IORef (Buffer CharBufElem)
    haLastDecode :: IORef (dec_state, Buffer Word8)
    haByteBuffer :: IORef (Buffer Word8)
    haType :: HandleType
    haDevice :: dev
    haOutputNL :: Newline
    haOtherSide :: Maybe (MVar Handle__)
    haLastDecode :: IORef (dec_state, Buffer Word8)
    haInputNL :: Newline
    haEncoder :: Maybe (TextEncoder enc_state)
    haDecoder :: Maybe (TextDecoder dec_state)
    haCodec :: Maybe TextEncoding
    haCharBuffer :: IORef (Buffer CharBufElem)
    haByteBuffer :: IORef (Buffer Word8)
    haBuffers :: IORef (BufferList CharBufElem)
    haType :: HandleType
    haDevice :: dev
    .. }

    -- -----------------------------------------------------------------------------
    -- hSetEncoding

    -- | The action 'hSetEncoding' @hdl@ @encoding@ changes the text encoding
    -- for the handle @hdl@ to @encoding@.  The default encoding when a 'Handle' is
    -- created is 'System.IO.localeEncoding', namely the default encoding for the
    -- current locale.
    --
    -- To create a 'Handle' with no encoding at all, use 'openBinaryFile'.  To
    -- stop further encoding or decoding on an existing 'Handle', use
    -- 'hSetBinaryMode'.
    --
    -- 'hSetEncoding' may need to flush buffered data in order to change
    -- the encoding.
    --
    hSetEncoding :: Handle -> TextEncoding -> IO ()
    hSetEncoding :: Handle -> TextEncoding -> IO ()
    hSetEncoding Handle
    hdl TextEncoding
    encoding =
      String -> Handle -> (Handle__ -> IO Handle__) -> IO ()
    withAllHandles__ String
    "hSetEncoding" Handle
    hdl forall a b. (a -> b) -> a -> b
    $ \h_ :: Handle__
    h_@Handle__{dev
    Maybe (MVar Handle__)
    Maybe (TextEncoder enc_state)
    Maybe (TextDecoder dec_state)
    Maybe TextEncoding
    IORef (dec_state, Buffer Word8)
    IORef (Buffer CharBufElem)
    IORef (Buffer Word8)
    IORef (BufferList CharBufElem)
    BufferMode
    HandleType
    Newline
    haOtherSide :: Maybe (MVar Handle__)
    haOutputNL :: Newline
    haInputNL :: Newline
    haCodec :: Maybe TextEncoding
    haDecoder :: Maybe (TextDecoder dec_state)
    haEncoder :: Maybe (TextEncoder enc_state)
    haBuffers :: IORef (BufferList CharBufElem)
    haCharBuffer :: IORef (Buffer CharBufElem)
    haLastDecode :: IORef (dec_state, Buffer Word8)
    haBufferMode :: BufferMode
    haByteBuffer :: IORef (Buffer Word8)
    haType :: HandleType
    haDevice :: dev
    haOutputNL :: Handle__ -> Newline
    haOtherSide :: Handle__ -> Maybe (MVar Handle__)
    haLastDecode :: ()
    haInputNL :: Handle__ -> Newline
    haEncoder :: ()
    haDecoder :: ()
    haCodec :: Handle__ -> Maybe TextEncoding
    haCharBuffer :: Handle__ -> IORef (Buffer CharBufElem)
    haByteBuffer :: Handle__ -> IORef (Buffer Word8)
    haBuffers :: Handle__ -> IORef (BufferList CharBufElem)
    haBufferMode :: Handle__ -> BufferMode
    haType :: Handle__ -> HandleType
    haDevice :: ()
    ..} -> do
        Handle__ -> IO ()
    flushCharBuffer Handle__
    h_
        Handle__ -> IO ()
    closeTextCodecs Handle__
    h_
        forall a.
    Maybe TextEncoding
    -> HandleType
    -> (forall es ds.
        Maybe (TextEncoder es) -> Maybe (TextDecoder ds) -> IO a)
    -> IO a
    openTextEncoding (forall a. a -> Maybe a
    Just TextEncoding
    encoding) HandleType
    haType forall a b. (a -> b) -> a -> b
    $ \ Maybe (TextEncoder es)
    mb_encoder Maybe (TextDecoder ds)
    mb_decoder -> do
        Buffer Word8
    bbuf <- forall a. IORef a -> IO a
    readIORef IORef (Buffer Word8)
    haByteBuffer
        IORef (ds, Buffer Word8)
    ref <- forall a. a -> IO (IORef a)
    newIORef (forall a. String -> a
    errorWithoutStackTrace String
    "last_decode")
        forall (m :: * -> *) a. Monad m => a -> m a
    return (Handle__{ haLastDecode :: IORef (ds, Buffer Word8)
    haLastDecode = IORef (ds, Buffer Word8)
    ref,
                          haDecoder :: Maybe (TextDecoder ds)
    haDecoder = Maybe (TextDecoder ds)
    mb_decoder,
                          haEncoder :: Maybe (TextEncoder es)
    haEncoder = Maybe (TextEncoder es)
    mb_encoder,
                          haCodec :: Maybe TextEncoding
    haCodec   = forall a. a -> Maybe a
    Just TextEncoding
    encoding, dev
    Maybe (MVar Handle__)
    IORef (Buffer CharBufElem)
    IORef (Buffer Word8)
    IORef (BufferList CharBufElem)
    BufferMode
    HandleType
    Newline
    haOtherSide :: Maybe (MVar Handle__)
    haOutputNL :: Newline
    haInputNL :: Newline
    haBuffers :: IORef (BufferList CharBufElem)
    haCharBuffer :: IORef (Buffer CharBufElem)
    haBufferMode :: BufferMode
    haByteBuffer :: IORef (Buffer Word8)
    haType :: HandleType
    haDevice :: dev
    haOutputNL :: Newline
    haOtherSide :: Maybe (MVar Handle__)
    haInputNL :: Newline
    haCharBuffer :: IORef (Buffer CharBufElem)
    haByteBuffer :: IORef (Buffer Word8)
    haBuffers :: IORef (BufferList CharBufElem)
    haBufferMode :: BufferMode
    haType :: HandleType
    haDevice :: dev
    .. })

    -- | Return the current 'TextEncoding' for the specified 'Handle', or
    -- 'Nothing' if the 'Handle' is in binary mode.
    --
    -- Note that the 'TextEncoding' remembers nothing about the state of
    -- the encoder/decoder in use on this 'Handle'.  For example, if the
    -- encoding in use is UTF-16, then using 'hGetEncoding' and
    -- 'hSetEncoding' to save and restore the encoding may result in an
    -- extra byte-order-mark being written to the file.
    --
    hGetEncoding :: Handle -> IO (Maybe TextEncoding)
    hGetEncoding :: Handle -> IO (Maybe TextEncoding)
    hGetEncoding Handle
    hdl =
      forall a. String -> Handle -> (Handle__ -> IO a) -> IO a
    withHandle_ String
    "hGetEncoding" Handle
    hdl forall a b. (a -> b) -> a -> b
    $ \h_ :: Handle__
    h_@Handle__{dev
    Maybe (MVar Handle__)
    Maybe (TextEncoder enc_state)
    Maybe (TextDecoder dec_state)
    Maybe TextEncoding
    IORef (dec_state, Buffer Word8)
    IORef (Buffer CharBufElem)
    IORef (Buffer Word8)
    IORef (BufferList CharBufElem)
    BufferMode
    HandleType
    Newline
    haOtherSide :: Maybe (MVar Handle__)
    haOutputNL :: Newline
    haInputNL :: Newline
    haCodec :: Maybe TextEncoding
    haDecoder :: Maybe (TextDecoder dec_state)
    haEncoder :: Maybe (TextEncoder enc_state)
    haBuffers :: IORef (BufferList CharBufElem)
    haCharBuffer :: IORef (Buffer CharBufElem)
    haLastDecode :: IORef (dec_state, Buffer Word8)
    haBufferMode :: BufferMode
    haByteBuffer :: IORef (Buffer Word8)
    haType :: HandleType
    haDevice :: dev
    haOutputNL :: Handle__ -> Newline
    haOtherSide :: Handle__ -> Maybe (MVar Handle__)
    haLastDecode :: ()
    haInputNL :: Handle__ -> Newline
    haEncoder :: ()
    haDecoder :: ()
    haCodec :: Handle__ -> Maybe TextEncoding
    haCharBuffer :: Handle__ -> IORef (Buffer CharBufElem)
    haByteBuffer :: Handle__ -> IORef (Buffer Word8)
    haBuffers :: Handle__ -> IORef (BufferList CharBufElem)
    haBufferMode :: Handle__ -> BufferMode
    haType :: Handle__ -> HandleType
    haDevice :: ()
    ..} -> forall (m :: * -> *) a. Monad m => a -> m a
    return Maybe TextEncoding
    haCodec

    -- -----------------------------------------------------------------------------
    -- hFlush

    -- | The action 'hFlush' @hdl@ causes any items buffered for output
    -- in handle @hdl@ to be sent immediately to the operating system.
    --
    -- This operation may fail with:
    --
    --  * 'System.IO.Error.isFullError' if the device is full;
    --
    --  * 'System.IO.Error.isPermissionError' if a system resource limit would be
    --    exceeded. It is unspecified whether the characters in the buffer are
    --    discarded or retained under these circumstances.

    hFlush :: Handle -> IO ()
    hFlush :: Handle -> IO ()
    hFlush Handle
    handle = forall a. String -> Handle -> (Handle__ -> IO a) -> IO a
    wantWritableHandle String
    "hFlush" Handle
    handle Handle__ -> IO ()
    flushWriteBuffer

    -- | The action 'hFlushAll' @hdl@ flushes all buffered data in @hdl@,
    -- including any buffered read data.  Buffered read data is flushed
    -- by seeking the file position back to the point before the bufferred
    -- data was read, and hence only works if @hdl@ is seekable (see
    -- 'hIsSeekable').
    --
    -- This operation may fail with:
    --
    --  * 'System.IO.Error.isFullError' if the device is full;
    --
    --  * 'System.IO.Error.isPermissionError' if a system resource limit would be
    --    exceeded. It is unspecified whether the characters in the buffer are
    --    discarded or retained under these circumstances;
    --
    --  * 'System.IO.Error.isIllegalOperation' if @hdl@ has buffered read data, and
    --    is not seekable.

    hFlushAll :: Handle -> IO ()
    hFlushAll :: Handle -> IO ()
    hFlushAll Handle
    handle = forall a. String -> Handle -> (Handle__ -> IO a) -> IO a
    withHandle_ String
    "hFlushAll" Handle
    handle Handle__ -> IO ()
    flushBuffer

    -- -----------------------------------------------------------------------------
    -- Repositioning Handles

    data HandlePosn = HandlePosn Handle HandlePosition

    -- | @since 4.1.0.0
    instance Eq HandlePosn where
        (HandlePosn Handle
    h1 Integer
    p1) == :: HandlePosn -> HandlePosn -> Bool
    == (HandlePosn Handle
    h2 Integer
    p2) = Integer
    p1forall a. Eq a => a -> a -> Bool
    ==Integer
    p2 Bool -> Bool -> Bool
    && Handle
    h1forall a. Eq a => a -> a -> Bool
    ==Handle
    h2

    -- | @since 4.1.0.0
    instance Show HandlePosn where
       showsPrec :: Int -> HandlePosn -> ShowS
    showsPrec Int
    p (HandlePosn Handle
    h Integer
    pos) =
            forall a. Show a => Int -> a -> ShowS
    showsPrec Int
    p Handle
    h forall b c a. (b -> c) -> (a -> b) -> a -> c
    . String -> ShowS
    showString String
    " at position " forall b c a. (b -> c) -> (a -> b) -> a -> c
    . forall a. Show a => a -> ShowS
    shows Integer
    pos

      -- HandlePosition is the Haskell equivalent of POSIX' off_t.
      -- We represent it as an Integer on the Haskell side, but
      -- cheat slightly in that hGetPosn calls upon a C helper
      -- that reports the position back via (merely) an Int.
    type HandlePosition = Integer

    -- | Computation 'hGetPosn' @hdl@ returns the current I\/O position of
    -- @hdl@ as a value of the abstract type 'HandlePosn'.

    hGetPosn :: Handle -> IO HandlePosn
    hGetPosn :: Handle -> IO HandlePosn
    hGetPosn Handle
    handle = do
        Integer
    posn <- Handle -> IO Integer
    hTell Handle
    handle
        forall (m :: * -> *) a. Monad m => a -> m a
    return (Handle -> Integer -> HandlePosn
    HandlePosn Handle
    handle Integer
    posn)

    -- | If a call to 'hGetPosn' @hdl@ returns a position @p@,
    -- then computation 'hSetPosn' @p@ sets the position of @hdl@
    -- to the position it held at the time of the call to 'hGetPosn'.
    --
    -- This operation may fail with:
    --
    --  * 'System.IO.Error.isPermissionError' if a system resource limit would be
    --    exceeded.

    hSetPosn :: HandlePosn -> IO ()
    hSetPosn :: HandlePosn -> IO ()
    hSetPosn (HandlePosn Handle
    h Integer
    i) = Handle -> SeekMode -> Integer -> IO ()
    hSeek Handle
    h SeekMode
    AbsoluteSeek Integer
    i

    -- ---------------------------------------------------------------------------
    -- hSeek

    {- Note:
     - when seeking using `SeekFromEnd', positive offsets (>=0) means
       seeking at or past EOF.

     - we possibly deviate from the report on the issue of seeking within
       the buffer and whether to flush it or not.  The report isn't exactly
       clear here.
    -}

    -- | Computation 'hSeek' @hdl mode i@ sets the position of handle
    -- @hdl@ depending on @mode@.
    -- The offset @i@ is given in terms of 8-bit bytes.
    --
    -- If @hdl@ is block- or line-buffered, then seeking to a position which is not
    -- in the current buffer will first cause any items in the output buffer to be
    -- written to the device, and then cause the input buffer to be discarded.
    -- Some handles may not be seekable (see 'hIsSeekable'), or only support a
    -- subset of the possible positioning operations (for instance, it may only
    -- be possible to seek to the end of a tape, or to a positive offset from
    -- the beginning or current position).
    -- It is not possible to set a negative I\/O position, or for
    -- a physical file, an I\/O position beyond the current end-of-file.
    --
    -- This operation may fail with:
    --
    --  * 'System.IO.Error.isIllegalOperationError' if the Handle is not seekable,
    --    or does not support the requested seek mode.
    --
    --  * 'System.IO.Error.isPermissionError' if a system resource limit would be
    --    exceeded.

    hSeek :: Handle -> SeekMode -> Integer -> IO ()
    hSeek :: Handle -> SeekMode -> Integer -> IO ()
    hSeek Handle
    handle SeekMode
    mode Integer
    offset =
        forall a. String -> Handle -> (Handle__ -> IO a) -> IO a
    wantSeekableHandle String
    "hSeek" Handle
    handle forall a b. (a -> b) -> a -> b
    $ \ handle_ :: Handle__
    handle_@Handle__{dev
    Maybe (MVar Handle__)
    Maybe (TextEncoder enc_state)
    Maybe (TextDecoder dec_state)
    Maybe TextEncoding
    IORef (dec_state, Buffer Word8)
    IORef (Buffer CharBufElem)
    IORef (Buffer Word8)
    IORef (BufferList CharBufElem)
    BufferMode
    HandleType
    Newline
    haOtherSide :: Maybe (MVar Handle__)
    haOutputNL :: Newline
    haInputNL :: Newline
    haCodec :: Maybe TextEncoding
    haDecoder :: Maybe (TextDecoder dec_state)
    haEncoder :: Maybe (TextEncoder enc_state)
    haBuffers :: IORef (BufferList CharBufElem)
    haCharBuffer :: IORef (Buffer CharBufElem)
    haLastDecode :: IORef (dec_state, Buffer Word8)
    haBufferMode :: BufferMode
    haByteBuffer :: IORef (Buffer Word8)
    haType :: HandleType
    haDevice :: dev
    haOutputNL :: Handle__ -> Newline
    haOtherSide :: Handle__ -> Maybe (MVar Handle__)
    haLastDecode :: ()
    haInputNL :: Handle__ -> Newline
    haEncoder :: ()
    haDecoder :: ()
    haCodec :: Handle__ -> Maybe TextEncoding
    haCharBuffer :: Handle__ -> IORef (Buffer CharBufElem)
    haByteBuffer :: Handle__ -> IORef (Buffer Word8)
    haBuffers :: Handle__ -> IORef (BufferList CharBufElem)
    haBufferMode :: Handle__ -> BufferMode
    haType :: Handle__ -> HandleType
    haDevice :: ()
    ..} -> do
        String -> IO ()
    debugIO (String
    "hSeek " forall a. [a] -> [a] -> [a]
    ++ forall a. Show a => a -> String
    show (SeekMode
    mode,Integer
    offset))
        Buffer CharBufElem
    cbuf <- forall a. IORef a -> IO a
    readIORef IORef (Buffer CharBufElem)
    haCharBuffer
        Buffer Word8
    bbuf <- forall a. IORef a -> IO a
    readIORef IORef (Buffer Word8)
    haByteBuffer
        String -> IO ()
    debugIO forall a b. (a -> b) -> a -> b
    $ String
    "hSeek - bbuf:" forall a. [a] -> [a] -> [a]
    ++ forall a. Buffer a -> String
    summaryBuffer Buffer Word8
    bbuf
        String -> IO ()
    debugIO forall a b. (a -> b) -> a -> b
    $ String
    "hSeek - cbuf:" forall a. [a] -> [a] -> [a]
    ++ forall a. Buffer a -> String
    summaryBuffer Buffer CharBufElem
    cbuf

        if forall e. Buffer e -> Bool
    isWriteBuffer Buffer CharBufElem
    cbuf
            then do Handle__ -> IO ()
    flushWriteBuffer Handle__
    handle_
                    Integer
    new_offset <- forall a. IODevice a => a -> SeekMode -> Integer -> IO Integer
    IODevice.seek dev
    haDevice SeekMode
    mode Integer
    offset
                    -- buffer has been updated, need to re-read it
                    Buffer Word8
    bbuf1 <- forall a. IORef a -> IO a
    readIORef IORef (Buffer Word8)
    haByteBuffer
                    let bbuf2 :: Buffer Word8
    bbuf2 = Buffer Word8
    bbuf1{ bufOffset :: Word64
    bufOffset = forall a b. (Integral a, Num b) => a -> b
    fromIntegral Integer
    new_offset }
                    String -> IO ()
    debugIO forall a b. (a -> b) -> a -> b
    $ String
    "hSeek - seek:: " forall a. [a] -> [a] -> [a]
    ++ forall a. Show a => a -> String
    show Integer
    offset forall a. [a] -> [a] -> [a]
    ++
                              String
    " - " forall a. [a] -> [a] -> [a]
    ++ forall a. Show a => a -> String
    show Integer
    new_offset
                    String -> IO ()
    debugIO forall a b. (a -> b) -> a -> b
    $ String
    "hSeek - wr flush bbuf1:" forall a. [a] -> [a] -> [a]
    ++ forall a. Buffer a -> String
    summaryBuffer Buffer Word8
    bbuf2
                    forall a. IORef a -> a -> IO ()
    writeIORef IORef (Buffer Word8)
    haByteBuffer Buffer Word8
    bbuf2
            else do

        let r :: Int
    r = forall e. Buffer e -> Int
    bufL Buffer CharBufElem
    cbuf; w :: Int
    w = forall e. Buffer e -> Int
    bufR Buffer CharBufElem
    cbuf
        if SeekMode
    mode forall a. Eq a => a -> a -> Bool
    == SeekMode
    RelativeSeek Bool -> Bool -> Bool
    && forall a. Maybe a -> Bool
    isNothing Maybe (TextDecoder dec_state)
    haDecoder Bool -> Bool -> Bool
    &&
           Integer
    offset forall a. Ord a => a -> a -> Bool
    >= Integer
    0 Bool -> Bool -> Bool
    && Integer
    offset forall a. Ord a => a -> a -> Bool
    < forall a b. (Integral a, Num b) => a -> b
    fromIntegral (Int
    w forall a. Num a => a -> a -> a
    - Int
    r)
            then forall a. IORef a -> a -> IO ()
    writeIORef IORef (Buffer CharBufElem)
    haCharBuffer Buffer CharBufElem
    cbuf{ bufL :: Int
    bufL = Int
    r forall a. Num a => a -> a -> a
    + forall a b. (Integral a, Num b) => a -> b
    fromIntegral Integer
    offset }
            else do

        Handle__ -> IO ()
    flushCharReadBuffer Handle__
    handle_
        Handle__ -> IO ()
    flushByteReadBuffer Handle__
    handle_
        -- read the updated values
        Buffer Word8
    bbuf2 <- forall a. IORef a -> IO a
    readIORef IORef (Buffer Word8)
    haByteBuffer
        Integer
    new_offset <- forall a. IODevice a => a -> SeekMode -> Integer -> IO Integer
    IODevice.seek dev
    haDevice SeekMode
    mode Integer
    offset
        String -> IO ()
    debugIO forall a b. (a -> b) -> a -> b
    $ String
    "hSeek after: " forall a. [a] -> [a] -> [a]
    ++ forall a. Show a => a -> String
    show Integer
    new_offset
        forall a. IORef a -> a -> IO ()
    writeIORef IORef (Buffer Word8)
    haByteBuffer Buffer Word8
    bbuf2{ bufOffset :: Word64
    bufOffset = forall a b. (Integral a, Num b) => a -> b
    fromIntegral Integer
    new_offset }

    -- | Computation 'hTell' @hdl@ returns the current position of the
    -- handle @hdl@, as the number of bytes from the beginning of
    -- the file.  The value returned may be subsequently passed to
    -- 'hSeek' to reposition the handle to the current position.
    --
    -- This operation may fail with:
    --
    --  * 'System.IO.Error.isIllegalOperationError' if the Handle is not seekable.
    --
    hTell :: Handle -> IO Integer
    hTell :: Handle -> IO Integer
    hTell Handle
    handle =
        forall a. String -> Handle -> (Handle__ -> IO a) -> IO a
    wantSeekableHandle String
    "hGetPosn" Handle
    handle forall a b. (a -> b) -> a -> b
    $ \ handle_ :: Handle__
    handle_@Handle__{dev
    Maybe (MVar Handle__)
    Maybe (TextEncoder enc_state)
    Maybe (TextDecoder dec_state)
    Maybe TextEncoding
    IORef (dec_state, Buffer Word8)
    IORef (Buffer CharBufElem)
    IORef (Buffer Word8)
    IORef (BufferList CharBufElem)
    BufferMode
    HandleType
    Newline
    haOtherSide :: Maybe (MVar Handle__)
    haOutputNL :: Newline
    haInputNL :: Newline
    haCodec :: Maybe TextEncoding
    haDecoder :: Maybe (TextDecoder dec_state)
    haEncoder :: Maybe (TextEncoder enc_state)
    haBuffers :: IORef (BufferList CharBufElem)
    haCharBuffer :: IORef (Buffer CharBufElem)
    haLastDecode :: IORef (dec_state, Buffer Word8)
    haBufferMode :: BufferMode
    haByteBuffer :: IORef (Buffer Word8)
    haType :: HandleType
    haDevice :: dev
    haOutputNL :: Handle__ -> Newline
    haOtherSide :: Handle__ -> Maybe (MVar Handle__)
    haLastDecode :: ()
    haInputNL :: Handle__ -> Newline
    haEncoder :: ()
    haDecoder :: ()
    haCodec :: Handle__ -> Maybe TextEncoding
    haCharBuffer :: Handle__ -> IORef (Buffer CharBufElem)
    haByteBuffer :: Handle__ -> IORef (Buffer Word8)
    haBuffers :: Handle__ -> IORef (BufferList CharBufElem)
    haBufferMode :: Handle__ -> BufferMode
    haType :: Handle__ -> HandleType
    haDevice :: ()
    ..} -> do

          -- TODO: Guard these on Windows
          Integer
    posn <- if IoSubSystem
    ioSubSystem forall a. Eq a => a -> a -> Bool
    == IoSubSystem
    IoNative
                             then (forall a b. (Integral a, Num b) => a -> b
    fromIntegral forall b c a. (b -> c) -> (a -> b) -> a -> c
    . forall e. Buffer e -> Word64
    bufOffset) forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
    `fmap` forall a. IORef a -> IO a
    readIORef IORef (Buffer Word8)
    haByteBuffer
                             else forall a. IODevice a => a -> IO Integer
    IODevice.tell dev
    haDevice

          -- we can't tell the real byte offset if there are buffered
          -- Chars, so must flush first:
          Handle__ -> IO ()
    flushCharBuffer Handle__
    handle_

          Buffer Word8
    bbuf <- forall a. IORef a -> IO a
    readIORef IORef (Buffer Word8)
    haByteBuffer
          String -> IO ()
    debugIO (String
    "hTell bbuf (elems=" forall a. [a] -> [a] -> [a]
    ++ forall a. Show a => a -> String
    show (forall e. Buffer e -> Int
    bufferElems Buffer Word8
    bbuf) forall a. [a] -> [a] -> [a]
    ++ String
    ")"
                   forall a. [a] -> [a] -> [a]
    ++ forall a. Buffer a -> String
    summaryBuffer Buffer Word8
    bbuf)

          let real_posn :: Integer
    real_posn
               | forall e. Buffer e -> Bool
    isWriteBuffer Buffer Word8
    bbuf = Integer
    posn forall a. Num a => a -> a -> a
    + forall a b. (Integral a, Num b) => a -> b
    fromIntegral (forall e. Buffer e -> Int
    bufferElems Buffer Word8
    bbuf)
               | Bool
    otherwise          = Integer
    posn forall a. Num a => a -> a -> a
    - forall a b. (Integral a, Num b) => a -> b
    fromIntegral (forall e. Buffer e -> Int
    bufferElems Buffer Word8
    bbuf)

          Buffer CharBufElem
    cbuf <- forall a. IORef a -> IO a
    readIORef IORef (Buffer CharBufElem)
    haCharBuffer
          String -> IO ()
    debugIO (String
    "\nhGetPosn: (posn, real_posn) = " forall a. [a] -> [a] -> [a]
    ++ forall a. Show a => a -> String
    show (Integer
    posn, Integer
    real_posn))
          String -> IO ()
    debugIO (String
    "   cbuf: " forall a. [a] -> [a] -> [a]
    ++ forall a. Buffer a -> String
    summaryBuffer Buffer CharBufElem
    cbuf forall a. [a] -> [a] -> [a]
    ++
                   String
    "   bbuf: " forall a. [a] -> [a] -> [a]
    ++ forall a. Buffer a -> String
    summaryBuffer Buffer Word8
    bbuf)

          forall (m :: * -> *) a. Monad m => a -> m a
    return Integer
    real_posn

    -- -----------------------------------------------------------------------------
    -- Handle Properties

    -- A number of operations return information about the properties of a
    -- handle.  Each of these operations returns `True' if the handle has
    -- the specified property, and `False' otherwise.

    hIsOpen :: Handle -> IO Bool
    hIsOpen :: Handle -> IO Bool
    hIsOpen Handle
    handle =
        forall a. String -> Handle -> (Handle__ -> IO a) -> IO a
    withHandle_ String
    "hIsOpen" Handle
    handle forall a b. (a -> b) -> a -> b
    $ \ Handle__
    handle_ -> do
        case Handle__ -> HandleType
    haType Handle__
    handle_ of
          HandleType
    ClosedHandle         -> forall (m :: * -> *) a. Monad m => a -> m a
    return Bool
    False
          HandleType
    SemiClosedHandle     -> forall (m :: * -> *) a. Monad m => a -> m a
    return Bool
    False
          HandleType
    _                    -> forall (m :: * -> *) a. Monad m => a -> m a
    return Bool
    True

    hIsClosed :: Handle -> IO Bool
    hIsClosed :: Handle -> IO Bool
    hIsClosed Handle
    handle =
        forall a. String -> Handle -> (Handle__ -> IO a) -> IO a
    withHandle_ String
    "hIsClosed" Handle
    handle forall a b. (a -> b) -> a -> b
    $ \ Handle__
    handle_ -> do
        case Handle__ -> HandleType
    haType Handle__
    handle_ of
          HandleType
    ClosedHandle         -> forall (m :: * -> *) a. Monad m => a -> m a
    return Bool
    True
          HandleType
    _                    -> forall (m :: * -> *) a. Monad m => a -> m a
    return Bool
    False

    {- not defined, nor exported, but mentioned
       here for documentation purposes:

        hSemiClosed :: Handle -> IO Bool
        hSemiClosed h = do
           ho <- hIsOpen h
           hc <- hIsClosed h
           return (not (ho || hc))
    -}

    hIsReadable :: Handle -> IO Bool
    hIsReadable :: Handle -> IO Bool
    hIsReadable (DuplexHandle String
    _ MVar Handle__
    _ MVar Handle__
    _) = forall (m :: * -> *) a. Monad m => a -> m a
    return Bool
    True
    hIsReadable Handle
    handle =
        forall a. String -> Handle -> (Handle__ -> IO a) -> IO a
    withHandle_ String
    "hIsReadable" Handle
    handle forall a b. (a -> b) -> a -> b
    $ \ Handle__
    handle_ -> do
        case Handle__ -> HandleType
    haType Handle__
    handle_ of
          HandleType
    ClosedHandle         -> forall a. IO a
    ioe_closedHandle
          HandleType
    SemiClosedHandle     -> forall a. IO a
    ioe_semiclosedHandle
          HandleType
    htype                -> forall (m :: * -> *) a. Monad m => a -> m a
    return (HandleType -> Bool
    isReadableHandleType HandleType
    htype)

    hIsWritable :: Handle -> IO Bool
    hIsWritable :: Handle -> IO Bool
    hIsWritable (DuplexHandle String
    _ MVar Handle__
    _ MVar Handle__
    _) = forall (m :: * -> *) a. Monad m => a -> m a
    return Bool
    True
    hIsWritable Handle
    handle =
        forall a. String -> Handle -> (Handle__ -> IO a) -> IO a
    withHandle_ String
    "hIsWritable" Handle
    handle forall a b. (a -> b) -> a -> b
    $ \ Handle__
    handle_ -> do
        case Handle__ -> HandleType
    haType Handle__
    handle_ of
          HandleType
    ClosedHandle         -> forall a. IO a
    ioe_closedHandle
          HandleType
    SemiClosedHandle     -> forall a. IO a
    ioe_semiclosedHandle
          HandleType
    htype                -> forall (m :: * -> *) a. Monad m => a -> m a
    return (HandleType -> Bool
    isWritableHandleType HandleType
    htype)

    -- | Computation 'hGetBuffering' @hdl@ returns the current buffering mode
    -- for @hdl@.

    hGetBuffering :: Handle -> IO BufferMode
    hGetBuffering :: Handle -> IO BufferMode
    hGetBuffering Handle
    handle =
        forall a. String -> Handle -> (Handle__ -> IO a) -> IO a
    withHandle_ String
    "hGetBuffering" Handle
    handle forall a b. (a -> b) -> a -> b
    $ \ Handle__
    handle_ -> do
        case Handle__ -> HandleType
    haType Handle__
    handle_ of
          HandleType
    ClosedHandle         -> forall a. IO a
    ioe_closedHandle
          HandleType
    _ ->
               -- We're being non-standard here, and allow the buffering
               -- of a semi-closed handle to be queried.   -- sof 6/98
              forall (m :: * -> *) a. Monad m => a -> m a
    return (Handle__ -> BufferMode
    haBufferMode Handle__
    handle_)  -- could be stricter..

    hIsSeekable :: Handle -> IO Bool
    hIsSeekable :: Handle -> IO Bool
    hIsSeekable Handle
    handle =
        forall a. String -> Handle -> (Handle__ -> IO a) -> IO a
    withHandle_ String
    "hIsSeekable" Handle
    handle forall a b. (a -> b) -> a -> b
    $ \ handle_ :: Handle__
    handle_@Handle__{dev
    Maybe (MVar Handle__)
    Maybe (TextEncoder enc_state)
    Maybe (TextDecoder dec_state)
    Maybe TextEncoding
    IORef (dec_state, Buffer Word8)
    IORef (Buffer CharBufElem)
    IORef (Buffer Word8)
    IORef (BufferList CharBufElem)
    BufferMode
    HandleType
    Newline
    haOtherSide :: Maybe (MVar Handle__)
    haOutputNL :: Newline
    haInputNL :: Newline
    haCodec :: Maybe TextEncoding
    haDecoder :: Maybe (TextDecoder dec_state)
    haEncoder :: Maybe (TextEncoder enc_state)
    haBuffers :: IORef (BufferList CharBufElem)
    haCharBuffer :: IORef (Buffer CharBufElem)
    haLastDecode :: IORef (dec_state, Buffer Word8)
    haBufferMode :: BufferMode
    haByteBuffer :: IORef (Buffer Word8)
    haType :: HandleType
    haDevice :: dev
    haOutputNL :: Handle__ -> Newline
    haOtherSide :: Handle__ -> Maybe (MVar Handle__)
    haLastDecode :: ()
    haInputNL :: Handle__ -> Newline
    haEncoder :: ()
    haDecoder :: ()
    haCodec :: Handle__ -> Maybe TextEncoding
    haCharBuffer :: Handle__ -> IORef (Buffer CharBufElem)
    haByteBuffer :: Handle__ -> IORef (Buffer Word8)
    haBuffers :: Handle__ -> IORef (BufferList CharBufElem)
    haBufferMode :: Handle__ -> BufferMode
    haType :: Handle__ -> HandleType
    haDevice :: ()
    ..} -> do
        case HandleType
    haType of
          HandleType
    ClosedHandle         -> forall a. IO a
    ioe_closedHandle
          HandleType
    SemiClosedHandle     -> forall a. IO a
    ioe_semiclosedHandle
          HandleType
    AppendHandle         -> forall (m :: * -> *) a. Monad m => a -> m a
    return Bool
    False
          HandleType
    _                    -> forall a. IODevice a => a -> IO Bool
    IODevice.isSeekable dev
    haDevice

    -- -----------------------------------------------------------------------------
    -- Changing echo status

    -- | Set the echoing status of a handle connected to a terminal.

    hSetEcho :: Handle -> Bool -> IO ()
    hSetEcho :: Handle -> Bool -> IO ()
    hSetEcho Handle
    handle Bool
    on = do
        Bool
    isT   <- Handle -> IO Bool
    hIsTerminalDevice Handle
    handle
        if Bool -> Bool
    not Bool
    isT
         then forall (m :: * -> *) a. Monad m => a -> m a
    return ()
         else
          forall a. String -> Handle -> (Handle__ -> IO a) -> IO a
    withHandle_ String
    "hSetEcho" Handle
    handle forall a b. (a -> b) -> a -> b
    $ \ Handle__{dev
    Maybe (MVar Handle__)
    Maybe (TextEncoder enc_state)
    Maybe (TextDecoder dec_state)
    Maybe TextEncoding
    IORef (dec_state, Buffer Word8)
    IORef (Buffer CharBufElem)
    IORef (Buffer Word8)
    IORef (BufferList CharBufElem)
    BufferMode
    HandleType
    Newline
    haOtherSide :: Maybe (MVar Handle__)
    haOutputNL :: Newline
    haInputNL :: Newline
    haCodec :: Maybe TextEncoding
    haDecoder :: Maybe (TextDecoder dec_state)
    haEncoder :: Maybe (TextEncoder enc_state)
    haBuffers :: IORef (BufferList CharBufElem)
    haCharBuffer :: IORef (Buffer CharBufElem)
    haLastDecode :: IORef (dec_state, Buffer Word8)
    haBufferMode :: BufferMode
    haByteBuffer :: IORef (Buffer Word8)
    haType :: HandleType
    haDevice :: dev
    haOutputNL :: Handle__ -> Newline
    haOtherSide :: Handle__ -> Maybe (MVar Handle__)
    haLastDecode :: ()
    haInputNL :: Handle__ -> Newline
    haEncoder :: ()
    haDecoder :: ()
    haCodec :: Handle__ -> Maybe TextEncoding
    haCharBuffer :: Handle__ -> IORef (Buffer CharBufElem)
    haByteBuffer :: Handle__ -> IORef (Buffer Word8)
    haBuffers :: Handle__ -> IORef (BufferList CharBufElem)
    haBufferMode :: Handle__ -> BufferMode
    haType :: Handle__ -> HandleType
    haDevice :: ()
    ..} -> do
          case HandleType
    haType of
             HandleType
    ClosedHandle -> forall a. IO a
    ioe_closedHandle
             HandleType
    _            -> forall a. IODevice a => a -> Bool -> IO ()
    IODevice.setEcho dev
    haDevice Bool
    on

    -- | Get the echoing status of a handle connected to a terminal.

    hGetEcho :: Handle -> IO Bool
    hGetEcho :: Handle -> IO Bool
    hGetEcho Handle
    handle = do
        Bool
    isT   <- Handle -> IO Bool
    hIsTerminalDevice Handle
    handle
        if Bool -> Bool
    not Bool
    isT
         then forall (m :: * -> *) a. Monad m => a -> m a
    return Bool
    False
         else
           forall a. String -> Handle -> (Handle__ -> IO a) -> IO a
    withHandle_ String
    "hGetEcho" Handle
    handle forall a b. (a -> b) -> a -> b
    $ \ Handle__{dev
    Maybe (MVar Handle__)
    Maybe (TextEncoder enc_state)
    Maybe (TextDecoder dec_state)
    Maybe TextEncoding
    IORef (dec_state, Buffer Word8)
    IORef (Buffer CharBufElem)
    IORef (Buffer Word8)
    IORef (BufferList CharBufElem)
    BufferMode
    HandleType
    Newline
    haOtherSide :: Maybe (MVar Handle__)
    haOutputNL :: Newline
    haInputNL :: Newline
    haCodec :: Maybe TextEncoding
    haDecoder :: Maybe (TextDecoder dec_state)
    haEncoder :: Maybe (TextEncoder enc_state)
    haBuffers :: IORef (BufferList CharBufElem)
    haCharBuffer :: IORef (Buffer CharBufElem)
    haLastDecode :: IORef (dec_state, Buffer Word8)
    haBufferMode :: BufferMode
    haByteBuffer :: IORef (Buffer Word8)
    haType :: HandleType
    haDevice :: dev
    haOutputNL :: Handle__ -> Newline
    haOtherSide :: Handle__ -> Maybe (MVar Handle__)
    haLastDecode :: ()
    haInputNL :: Handle__ -> Newline
    haEncoder :: ()
    haDecoder :: ()
    haCodec :: Handle__ -> Maybe TextEncoding
    haCharBuffer :: Handle__ -> IORef (Buffer CharBufElem)
    haByteBuffer :: Handle__ -> IORef (Buffer Word8)
    haBuffers :: Handle__ -> IORef (BufferList CharBufElem)
    haBufferMode :: Handle__ -> BufferMode
    haType :: Handle__ -> HandleType
    haDevice :: ()
    ..} -> do
           case HandleType
    haType of
             HandleType
    ClosedHandle -> forall a. IO a
    ioe_closedHandle
             HandleType
    _            -> forall a. IODevice a => a -> IO Bool
    IODevice.getEcho dev
    haDevice

    -- | Is the handle connected to a terminal?

    hIsTerminalDevice :: Handle -> IO Bool
    hIsTerminalDevice :: Handle -> IO Bool
    hIsTerminalDevice Handle
    handle =
        forall a. String -> Handle -> (Handle__ -> IO a) -> IO a
    withHandle_ String
    "hIsTerminalDevice" Handle
    handle forall a b. (a -> b) -> a -> b
    $ \ Handle__{dev
    Maybe (MVar Handle__)
    Maybe (TextEncoder enc_state)
    Maybe (TextDecoder dec_state)
    Maybe TextEncoding
    IORef (dec_state, Buffer Word8)
    IORef (Buffer CharBufElem)
    IORef (Buffer Word8)
    IORef (BufferList CharBufElem)
    BufferMode
    HandleType
    Newline
    haOtherSide :: Maybe (MVar Handle__)
    haOutputNL :: Newline
    haInputNL :: Newline
    haCodec :: Maybe TextEncoding
    haDecoder :: Maybe (TextDecoder dec_state)
    haEncoder :: Maybe (TextEncoder enc_state)
    haBuffers :: IORef (BufferList CharBufElem)
    haCharBuffer :: IORef (Buffer CharBufElem)
    haLastDecode :: IORef (dec_state, Buffer Word8)
    haBufferMode :: BufferMode
    haByteBuffer :: IORef (Buffer Word8)
    haType :: HandleType
    haDevice :: dev
    haOutputNL :: Handle__ -> Newline
    haOtherSide :: Handle__ -> Maybe (MVar Handle__)
    haLastDecode :: ()
    haInputNL :: Handle__ -> Newline
    haEncoder :: ()
    haDecoder :: ()
    haCodec :: Handle__ -> Maybe TextEncoding
    haCharBuffer :: Handle__ -> IORef (Buffer CharBufElem)
    haByteBuffer :: Handle__ -> IORef (Buffer Word8)
    haBuffers :: Handle__ -> IORef (BufferList CharBufElem)
    haBufferMode :: Handle__ -> BufferMode
    haType :: Handle__ -> HandleType
    haDevice :: ()
    ..} -> do
         case HandleType
    haType of
           HandleType
    ClosedHandle -> forall a. IO a
    ioe_closedHandle
           HandleType
    _            -> forall a. IODevice a => a -> IO Bool
    IODevice.isTerminal dev
    haDevice

    -- -----------------------------------------------------------------------------
    -- hSetBinaryMode

    -- | Select binary mode ('True') or text mode ('False') on a open handle.
    -- (See also 'openBinaryFile'.)
    --
    -- This has the same effect as calling 'hSetEncoding' with 'char8', together
    -- with 'hSetNewlineMode' with 'noNewlineTranslation'.
    --
    hSetBinaryMode :: Handle -> Bool -> IO ()
    hSetBinaryMode :: Handle -> Bool -> IO ()
    hSetBinaryMode Handle
    handle Bool
    bin =
      String -> Handle -> (Handle__ -> IO Handle__) -> IO ()
    withAllHandles__ String
    "hSetBinaryMode" Handle
    handle forall a b. (a -> b) -> a -> b
    $ \ h_ :: Handle__
    h_@Handle__{dev
    Maybe (MVar Handle__)
    Maybe (TextEncoder enc_state)
    Maybe (TextDecoder dec_state)
    Maybe TextEncoding
    IORef (dec_state, Buffer Word8)
    IORef (Buffer CharBufElem)
    IORef (Buffer Word8)
    IORef (BufferList CharBufElem)
    BufferMode
    HandleType
    Newline
    haOtherSide :: Maybe (MVar Handle__)
    haOutputNL :: Newline
    haInputNL :: Newline
    haCodec :: Maybe TextEncoding
    haDecoder :: Maybe (TextDecoder dec_state)
    haEncoder :: Maybe (TextEncoder enc_state)
    haBuffers :: IORef (BufferList CharBufElem)
    haCharBuffer :: IORef (Buffer CharBufElem)
    haLastDecode :: IORef (dec_state, Buffer Word8)
    haBufferMode :: BufferMode
    haByteBuffer :: IORef (Buffer Word8)
    haType :: HandleType
    haDevice :: dev
    haOutputNL :: Handle__ -> Newline
    haOtherSide :: Handle__ -> Maybe (MVar Handle__)
    haLastDecode :: ()
    haInputNL :: Handle__ -> Newline
    haEncoder :: ()
    haDecoder :: ()
    haCodec :: Handle__ -> Maybe TextEncoding
    haCharBuffer :: Handle__ -> IORef (Buffer CharBufElem)
    haByteBuffer :: Handle__ -> IORef (Buffer Word8)
    haBuffers :: Handle__ -> IORef (BufferList CharBufElem)
    haBufferMode :: Handle__ -> BufferMode
    haType :: Handle__ -> HandleType
    haDevice :: ()
    ..} ->
        do
             Handle__ -> IO ()
    flushCharBuffer Handle__
    h_
             Handle__ -> IO ()
    closeTextCodecs Handle__
    h_

             Maybe TextEncoding
    mb_te <- if Bool
    bin then forall (m :: * -> *) a. Monad m => a -> m a
    return forall a. Maybe a
    Nothing
                             else forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
    fmap forall a. a -> Maybe a
    Just IO TextEncoding
    getLocaleEncoding

             forall a.
    Maybe TextEncoding
    -> HandleType
    -> (forall es ds.
        Maybe (TextEncoder es) -> Maybe (TextDecoder ds) -> IO a)
    -> IO a
    openTextEncoding Maybe TextEncoding
    mb_te HandleType
    haType forall a b. (a -> b) -> a -> b
    $ \ Maybe (TextEncoder es)
    mb_encoder Maybe (TextDecoder ds)
    mb_decoder -> do

             -- should match the default newline mode, whatever that is
             let nl :: NewlineMode
    nl    | Bool
    bin       = NewlineMode
    noNewlineTranslation
                       | Bool
    otherwise = NewlineMode
    nativeNewlineMode

             Buffer Word8
    bbuf <- forall a. IORef a -> IO a
    readIORef IORef (Buffer Word8)
    haByteBuffer
             IORef (ds, Buffer Word8)
    ref <- forall a. a -> IO (IORef a)
    newIORef (forall a. String -> a
    errorWithoutStackTrace String
    "codec_state", Buffer Word8
    bbuf)

             forall (m :: * -> *) a. Monad m => a -> m a
    return Handle__{ haLastDecode :: IORef (ds, Buffer Word8)
    haLastDecode = IORef (ds, Buffer Word8)
    ref,
                              haEncoder :: Maybe (TextEncoder es)
    haEncoder  = Maybe (TextEncoder es)
    mb_encoder,
                              haDecoder :: Maybe (TextDecoder ds)
    haDecoder  = Maybe (TextDecoder ds)
    mb_decoder,
                              haCodec :: Maybe TextEncoding
    haCodec    = Maybe TextEncoding
    mb_te,
                              haInputNL :: Newline
    haInputNL  = NewlineMode -> Newline
    inputNL NewlineMode
    nl,
                              haOutputNL :: Newline
    haOutputNL = NewlineMode -> Newline
    outputNL NewlineMode
    nl, dev
    Maybe (MVar Handle__)
    IORef (Buffer CharBufElem)
    IORef (Buffer Word8)
    IORef (BufferList CharBufElem)
    BufferMode
    HandleType
    haOtherSide :: Maybe (MVar Handle__)
    haBuffers :: IORef (BufferList CharBufElem)
    haCharBuffer :: IORef (Buffer CharBufElem)
    haBufferMode :: BufferMode
    haByteBuffer :: IORef (Buffer Word8)
    haType :: HandleType
    haDevice :: dev
    haOtherSide :: Maybe (MVar Handle__)
    haCharBuffer :: IORef (Buffer CharBufElem)
    haByteBuffer :: IORef (Buffer Word8)
    haBuffers :: IORef (BufferList CharBufElem)
    haBufferMode :: BufferMode
    haType :: HandleType
    haDevice :: dev
    .. }

    -- -----------------------------------------------------------------------------
    -- hSetNewlineMode

    -- | Set the 'NewlineMode' on the specified 'Handle'.  All buffered
    -- data is flushed first.
    hSetNewlineMode :: Handle -> NewlineMode -> IO ()
    hSetNewlineMode :: Handle -> NewlineMode -> IO ()
    hSetNewlineMode Handle
    handle NewlineMode{ inputNL :: NewlineMode -> Newline
    inputNL=Newline
    i, outputNL :: NewlineMode -> Newline
    outputNL=Newline
    o } =
      String -> Handle -> (Handle__ -> IO Handle__) -> IO ()
    withAllHandles__ String
    "hSetNewlineMode" Handle
    handle forall a b. (a -> b) -> a -> b
    $ \h_ :: Handle__
    h_@Handle__{} ->
        do
             Handle__ -> IO ()
    flushBuffer Handle__
    h_
             forall (m :: * -> *) a. Monad m => a -> m a
    return Handle__
    h_{ haInputNL :: Newline
    haInputNL=Newline
    i, haOutputNL :: Newline
    haOutputNL=Newline
    o }

    -- -----------------------------------------------------------------------------
    -- Duplicating a Handle

    -- | Returns a duplicate of the original handle, with its own buffer.
    -- The two Handles will share a file pointer, however.  The original
    -- handle's buffer is flushed, including discarding any input data,
    -- before the handle is duplicated.

    hDuplicate :: Handle -> IO Handle
    hDuplicate :: Handle -> IO Handle
    hDuplicate h :: Handle
    h@(FileHandle String
    path MVar Handle__
    m) =
      forall a.
    String -> Handle -> MVar Handle__ -> (Handle__ -> IO a) -> IO a
    withHandle_' String
    "hDuplicate" Handle
    h MVar Handle__
    m forall a b. (a -> b) -> a -> b
    $ \Handle__
    h_ ->
          String
    -> Handle
    -> Maybe (MVar Handle__)
    -> Handle__
    -> Maybe HandleFinalizer
    -> IO Handle
    dupHandle String
    path Handle
    h forall a. Maybe a
    Nothing Handle__
    h_ (forall a. a -> Maybe a
    Just HandleFinalizer
    handleFinalizer)
    hDuplicate h :: Handle
    h@(DuplexHandle String
    path MVar Handle__
    r MVar Handle__
    w) = do
      write_side :: Handle
    write_side@(FileHandle String
    _ MVar Handle__
    write_m) <-
         forall a.
    String -> Handle -> MVar Handle__ -> (Handle__ -> IO a) -> IO a
    withHandle_' String
    "hDuplicate" Handle
    h MVar Handle__
    w forall a b. (a -> b) -> a -> b
    $ \Handle__
    h_ ->
            String
    -> Handle
    -> Maybe (MVar Handle__)
    -> Handle__
    -> Maybe HandleFinalizer
    -> IO Handle
    dupHandle String
    path Handle
    h forall a. Maybe a
    Nothing Handle__
    h_ (forall a. a -> Maybe a
    Just HandleFinalizer
    handleFinalizer)
      read_side :: Handle
    read_side@(FileHandle String
    _ MVar Handle__
    read_m) <-
        forall a.
    String -> Handle -> MVar Handle__ -> (Handle__ -> IO a) -> IO a
    withHandle_' String
    "hDuplicate" Handle
    h MVar Handle__
    r forall a b. (a -> b) -> a -> b
    $ \Handle__
    h_ ->
            String
    -> Handle
    -> Maybe (MVar Handle__)
    -> Handle__
    -> Maybe HandleFinalizer
    -> IO Handle
    dupHandle String
    path Handle
    h (forall a. a -> Maybe a
    Just MVar Handle__
    write_m) Handle__
    h_  forall a. Maybe a
    Nothing
      forall (m :: * -> *) a. Monad m => a -> m a
    return (String -> MVar Handle__ -> MVar Handle__ -> Handle
    DuplexHandle String
    path MVar Handle__
    read_m MVar Handle__
    write_m)

    dupHandle :: FilePath
              -> Handle
              -> Maybe (MVar Handle__)
              -> Handle__
              -> Maybe HandleFinalizer
              -> IO Handle
    dupHandle :: String
    -> Handle
    -> Maybe (MVar Handle__)
    -> Handle__
    -> Maybe HandleFinalizer
    -> IO Handle
    dupHandle String
    filepath Handle
    h Maybe (MVar Handle__)
    other_side h_ :: Handle__
    h_@Handle__{dev
    Maybe (MVar Handle__)
    Maybe (TextEncoder enc_state)
    Maybe (TextDecoder dec_state)
    Maybe TextEncoding
    IORef (dec_state, Buffer Word8)
    IORef (Buffer CharBufElem)
    IORef (Buffer Word8)
    IORef (BufferList CharBufElem)
    BufferMode
    HandleType
    Newline
    haOtherSide :: Maybe (MVar Handle__)
    haOutputNL :: Newline
    haInputNL :: Newline
    haCodec :: Maybe TextEncoding
    haDecoder :: Maybe (TextDecoder dec_state)
    haEncoder :: Maybe (TextEncoder enc_state)
    haBuffers :: IORef (BufferList CharBufElem)
    haCharBuffer :: IORef (Buffer CharBufElem)
    haLastDecode :: IORef (dec_state, Buffer Word8)
    haBufferMode :: BufferMode
    haByteBuffer :: IORef (Buffer Word8)
    haType :: HandleType
    haDevice :: dev
    haOutputNL :: Handle__ -> Newline
    haOtherSide :: Handle__ -> Maybe (MVar Handle__)
    haLastDecode :: ()
    haInputNL :: Handle__ -> Newline
    haEncoder :: ()
    haDecoder :: ()
    haCodec :: Handle__ -> Maybe TextEncoding
    haCharBuffer :: Handle__ -> IORef (Buffer CharBufElem)
    haByteBuffer :: Handle__ -> IORef (Buffer Word8)
    haBuffers :: Handle__ -> IORef (BufferList CharBufElem)
    haBufferMode :: Handle__ -> BufferMode
    haType :: Handle__ -> HandleType
    haDevice :: ()
    ..} Maybe HandleFinalizer
    mb_finalizer = do
      -- flush the buffer first, so we don't have to copy its contents
      Handle__ -> IO ()
    flushBuffer Handle__
    h_
      case Maybe (MVar Handle__)
    other_side of
        Maybe (MVar Handle__)
    Nothing -> do
           dev
    new_dev <- forall a. IODevice a => a -> IO a
    IODevice.dup dev
    haDevice
           forall dev.
    (RawIO dev, IODevice dev, BufferedIO dev, Typeable dev) =>
    dev
    -> String
    -> Maybe (MVar Handle__)
    -> Handle__
    -> Maybe HandleFinalizer
    -> IO Handle
    dupHandle_ dev
    new_dev String
    filepath Maybe (MVar Handle__)
    other_side Handle__
    h_ Maybe HandleFinalizer
    mb_finalizer
        Just MVar Handle__
    r  ->
           forall a.
    String -> Handle -> MVar Handle__ -> (Handle__ -> IO a) -> IO a
    withHandle_' String
    "dupHandle" Handle
    h MVar Handle__
    r forall a b. (a -> b) -> a -> b
    $ \Handle__{haDevice :: ()
    haDevice=dev
    dev} ->
             forall dev.
    (RawIO dev, IODevice dev, BufferedIO dev, Typeable dev) =>
    dev
    -> String
    -> Maybe (MVar Handle__)
    -> Handle__
    -> Maybe HandleFinalizer
    -> IO Handle
    dupHandle_ dev
    dev String
    filepath Maybe (MVar Handle__)
    other_side Handle__
    h_ Maybe HandleFinalizer
    mb_finalizer

    dupHandle_ :: (RawIO dev, IODevice dev, BufferedIO dev, Typeable dev) => dev
               -> FilePath
               -> Maybe (MVar Handle__)
               -> Handle__
               -> Maybe HandleFinalizer
               -> IO Handle
    dupHandle_ :: forall dev.
    (RawIO dev, IODevice dev, BufferedIO dev, Typeable dev) =>
    dev
    -> String
    -> Maybe (MVar Handle__)
    -> Handle__
    -> Maybe HandleFinalizer
    -> IO Handle
    dupHandle_ dev
    new_dev String
    filepath Maybe (MVar Handle__)
    other_side h_ :: Handle__
    h_@Handle__{dev
    Maybe (MVar Handle__)
    Maybe (TextEncoder enc_state)
    Maybe (TextDecoder dec_state)
    Maybe TextEncoding
    IORef (dec_state, Buffer Word8)
    IORef (Buffer CharBufElem)
    IORef (Buffer Word8)
    IORef (BufferList CharBufElem)
    BufferMode
    HandleType
    Newline
    haOtherSide :: Maybe (MVar Handle__)
    haOutputNL :: Newline
    haInputNL :: Newline
    haCodec :: Maybe TextEncoding
    haDecoder :: Maybe (TextDecoder dec_state)
    haEncoder :: Maybe (TextEncoder enc_state)
    haBuffers :: IORef (BufferList CharBufElem)
    haCharBuffer :: IORef (Buffer CharBufElem)
    haLastDecode :: IORef (dec_state, Buffer Word8)
    haBufferMode :: BufferMode
    haByteBuffer :: IORef (Buffer Word8)
    haType :: HandleType
    haDevice :: dev
    haOutputNL :: Handle__ -> Newline
    haOtherSide :: Handle__ -> Maybe (MVar Handle__)
    haLastDecode :: ()
    haInputNL :: Handle__ -> Newline
    haEncoder :: ()
    haDecoder :: ()
    haCodec :: Handle__ -> Maybe TextEncoding
    haCharBuffer :: Handle__ -> IORef (Buffer CharBufElem)
    haByteBuffer :: Handle__ -> IORef (Buffer Word8)
    haBuffers :: Handle__ -> IORef (BufferList CharBufElem)
    haBufferMode :: Handle__ -> BufferMode
    haType :: Handle__ -> HandleType
    haDevice :: ()
    ..} Maybe HandleFinalizer
    mb_finalizer = do
       -- XXX wrong!
      Maybe TextEncoding
    mb_codec <- if forall a. Maybe a -> Bool
    isJust Maybe (TextEncoder enc_state)
    haEncoder then forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
    fmap forall a. a -> Maybe a
    Just IO TextEncoding
    getLocaleEncoding else forall (m :: * -> *) a. Monad m => a -> m a
    return forall a. Maybe a
    Nothing
      forall dev.
    (RawIO dev, IODevice dev, BufferedIO dev, Typeable dev) =>
    dev
    -> String
    -> HandleType
    -> Bool
    -> Maybe TextEncoding
    -> NewlineMode
    -> Maybe HandleFinalizer
    -> Maybe (MVar Handle__)
    -> IO Handle
    mkHandle dev
    new_dev String
    filepath HandleType
    haType Bool
    True{-buffered-} Maybe TextEncoding
    mb_codec
          NewlineMode { inputNL :: Newline
    inputNL = Newline
    haInputNL, outputNL :: Newline
    outputNL = Newline
    haOutputNL }
          Maybe HandleFinalizer
    mb_finalizer Maybe (MVar Handle__)
    other_side

    -- -----------------------------------------------------------------------------
    -- Replacing a Handle

    {- |
    Makes the second handle a duplicate of the first handle.  The second
    handle will be closed first, if it is not already.

    This can be used to retarget the standard Handles, for example:

    > do h <- openFile "mystdout" WriteMode
    >    hDuplicateTo h stdout
    -}

    hDuplicateTo :: Handle -> Handle -> IO ()
    hDuplicateTo :: Handle -> Handle -> IO ()
    hDuplicateTo h1 :: Handle
    h1@(FileHandle String
    path MVar Handle__
    m1) h2 :: Handle
    h2@(FileHandle String
    _ MVar Handle__
    m2) =
     String
    -> Handle -> MVar Handle__ -> (Handle__ -> IO Handle__) -> IO ()
    withHandle__' String
    "hDuplicateTo" Handle
    h2 MVar Handle__
    m2 forall a b. (a -> b) -> a -> b
    $ \Handle__
    h2_ -> do
       IO () -> IO ()
    try forall a b. (a -> b) -> a -> b
    $ Handle__ -> IO ()
    flushWriteBuffer Handle__
    h2_
       forall a.
    String -> Handle -> MVar Handle__ -> (Handle__ -> IO a) -> IO a
    withHandle_' String
    "hDuplicateTo" Handle
    h1 MVar Handle__
    m1 forall a b. (a -> b) -> a -> b
    $ \Handle__
    h1_ ->
         String
    -> Handle
    -> Maybe (MVar Handle__)
    -> Handle__
    -> Handle__
    -> Maybe HandleFinalizer
    -> IO Handle__
    dupHandleTo String
    path Handle
    h1 forall a. Maybe a
    Nothing Handle__
    h2_ Handle__
    h1_ (forall a. a -> Maybe a
    Just HandleFinalizer
    handleFinalizer)
    hDuplicateTo h1 :: Handle
    h1@(DuplexHandle String
    path MVar Handle__
    r1 MVar Handle__
    w1) h2 :: Handle
    h2@(DuplexHandle String
    _ MVar Handle__
    r2 MVar Handle__
    w2)  = do
     String
    -> Handle -> MVar Handle__ -> (Handle__ -> IO Handle__) -> IO ()
    withHandle__' String
    "hDuplicateTo" Handle
    h2 MVar Handle__
    w2  forall a b. (a -> b) -> a -> b
    $ \Handle__
    w2_ -> do
       IO () -> IO ()
    try forall a b. (a -> b) -> a -> b
    $ Handle__ -> IO ()
    flushWriteBuffer Handle__
    w2_
       forall a.
    String -> Handle -> MVar Handle__ -> (Handle__ -> IO a) -> IO a
    withHandle_' String
    "hDuplicateTo" Handle
    h1 MVar Handle__
    w1 forall a b. (a -> b) -> a -> b
    $ \Handle__
    w1_ ->
         String
    -> Handle
    -> Maybe (MVar Handle__)
    -> Handle__
    -> Handle__
    -> Maybe HandleFinalizer
    -> IO Handle__
    dupHandleTo String
    path Handle
    h1 forall a. Maybe a
    Nothing Handle__
    w2_ Handle__
    w1_ (forall a. a -> Maybe a
    Just HandleFinalizer
    handleFinalizer)
     String
    -> Handle -> MVar Handle__ -> (Handle__ -> IO Handle__) -> IO ()
    withHandle__' String
    "hDuplicateTo" Handle
    h2 MVar Handle__
    r2  forall a b. (a -> b) -> a -> b
    $ \Handle__
    r2_ -> do
       IO () -> IO ()
    try forall a b. (a -> b) -> a -> b
    $ Handle__ -> IO ()
    flushWriteBuffer Handle__
    r2_
       forall a.
    String -> Handle -> MVar Handle__ -> (Handle__ -> IO a) -> IO a
    withHandle_' String
    "hDuplicateTo" Handle
    h1 MVar Handle__
    r1 forall a b. (a -> b) -> a -> b
    $ \Handle__
    r1_ ->
         String
    -> Handle
    -> Maybe (MVar Handle__)
    -> Handle__
    -> Handle__
    -> Maybe HandleFinalizer
    -> IO Handle__
    dupHandleTo String
    path Handle
    h1 (forall a. a -> Maybe a
    Just MVar Handle__
    w1) Handle__
    r2_ Handle__
    r1_ forall a. Maybe a
    Nothing
    hDuplicateTo Handle
    h1 Handle
    _ =
      forall a. Handle -> IO a
    ioe_dupHandlesNotCompatible Handle
    h1

    try :: IO () -> IO ()
    try :: IO () -> IO ()
    try IO ()
    io = IO ()
    io forall e a. Exception e => IO a -> (e -> IO a) -> IO a
    `catchException` (forall a b. a -> b -> a
    const (forall (f :: * -> *) a. Applicative f => a -> f a
    pure ()) :: SomeException -> IO ())

    ioe_dupHandlesNotCompatible :: Handle -> IO a
    ioe_dupHandlesNotCompatible :: forall a. Handle -> IO a
    ioe_dupHandlesNotCompatible Handle
    h =
       forall a. IOException -> IO a
    ioException (Maybe Handle
    -> IOErrorType
    -> String
    -> String
    -> Maybe CInt
    -> Maybe String
    -> IOException
    IOError (forall a. a -> Maybe a
    Just Handle
    h) IOErrorType
    IllegalOperation String
    "hDuplicateTo"
                    String
    "handles are incompatible" forall a. Maybe a
    Nothing forall a. Maybe a
    Nothing)

    dupHandleTo :: FilePath
                -> Handle
                -> Maybe (MVar Handle__)
                -> Handle__
                -> Handle__
                -> Maybe HandleFinalizer
                -> IO Handle__
    dupHandleTo :: String
    -> Handle
    -> Maybe (MVar Handle__)
    -> Handle__
    -> Handle__
    -> Maybe HandleFinalizer
    -> IO Handle__
    dupHandleTo String
    filepath Handle
    h Maybe (MVar Handle__)
    other_side
                hto_ :: Handle__
    hto_@Handle__{haDevice :: ()
    haDevice=dev
    devTo}
                h_ :: Handle__
    h_@Handle__{haDevice :: ()
    haDevice=dev
    dev} Maybe HandleFinalizer
    mb_finalizer = do
      Handle__ -> IO ()
    flushBuffer Handle__
    h_
      case forall a b. (Typeable a, Typeable b) => a -> Maybe b
    cast dev
    devTo of
        Maybe dev
    Nothing   -> forall a. Handle -> IO a
    ioe_dupHandlesNotCompatible Handle
    h
        Just dev
    dev' -> do
          dev
    _ <- forall a. IODevice a => a -> a -> IO a
    IODevice.dup2 dev
    dev dev
    dev'
          FileHandle String
    _ MVar Handle__
    m <- forall dev.
    (RawIO dev, IODevice dev, BufferedIO dev, Typeable dev) =>
    dev
    -> String
    -> Maybe (MVar Handle__)
    -> Handle__
    -> Maybe HandleFinalizer
    -> IO Handle
    dupHandle_ dev
    dev' String
    filepath Maybe (MVar Handle__)
    other_side Handle__
    h_ Maybe HandleFinalizer
    mb_finalizer
          forall a. MVar a -> IO a
    takeMVar MVar Handle__
    m

    -- ---------------------------------------------------------------------------
    -- showing Handles.
    --
    -- | 'hShow' is in the 'IO' monad, and gives more comprehensive output
    -- than the (pure) instance of 'Show' for 'Handle'.

    hShow :: Handle -> IO String
    hShow :: Handle -> IO String
    hShow h :: Handle
    h@(FileHandle String
    path MVar Handle__
    _) = String -> Bool -> Handle -> IO String
    showHandle' String
    path Bool
    False Handle
    h
    hShow h :: Handle
    h@(DuplexHandle String
    path MVar Handle__
    _ MVar Handle__
    _) = String -> Bool -> Handle -> IO String
    showHandle' String
    path Bool
    True Handle
    h

    showHandle' :: String -> Bool -> Handle -> IO String
    showHandle' :: String -> Bool -> Handle -> IO String
    showHandle' String
    filepath Bool
    is_duplex Handle
    h =
      forall a. String -> Handle -> (Handle__ -> IO a) -> IO a
    withHandle_ String
    "showHandle" Handle
    h forall a b. (a -> b) -> a -> b
    $ \Handle__
    hdl_ ->
        let
         showType :: ShowS
    showType | Bool
    is_duplex = String -> ShowS
    showString String
    "duplex (read-write)"
                  | Bool
    otherwise = forall a. Show a => a -> ShowS
    shows (Handle__ -> HandleType
    haType Handle__
    hdl_)
        in
        forall (m :: * -> *) a. Monad m => a -> m a
    return
          (( CharBufElem -> ShowS
    showChar CharBufElem
    '{' forall b c a. (b -> c) -> (a -> b) -> a -> c
    .
            HandleType -> ShowS -> ShowS
    showHdl (Handle__ -> HandleType
    haType Handle__
    hdl_)
                (String -> ShowS
    showString String
    "loc=" forall b c a. (b -> c) -> (a -> b) -> a -> c
    . String -> ShowS
    showString String
    filepath forall b c a. (b -> c) -> (a -> b) -> a -> c
    . CharBufElem -> ShowS
    showChar CharBufElem
    ',' forall b c a. (b -> c) -> (a -> b) -> a -> c
    .
                 String -> ShowS
    showString String
    "type=" forall b c a. (b -> c) -> (a -> b) -> a -> c
    . ShowS
    showType forall b c a. (b -> c) -> (a -> b) -> a -> c
    . CharBufElem -> ShowS
    showChar CharBufElem
    ',' forall b c a. (b -> c) -> (a -> b) -> a -> c
    .
                 String -> ShowS
    showString String
    "buffering=" forall b c a. (b -> c) -> (a -> b) -> a -> c
    . forall e. Buffer e -> BufferMode -> ShowS
    showBufMode (forall a. IO a -> a
    unsafePerformIO (forall a. IORef a -> IO a
    readIORef (Handle__ -> IORef (Buffer CharBufElem)
    haCharBuffer Handle__
    hdl_))) (Handle__ -> BufferMode
    haBufferMode Handle__
    hdl_) forall b c a. (b -> c) -> (a -> b) -> a -> c
    . String -> ShowS
    showString String
    "}" )
          ) String
    "")
       where

        showHdl :: HandleType -> ShowS -> ShowS
        showHdl :: HandleType -> ShowS -> ShowS
    showHdl HandleType
    ht ShowS
    cont =
           case HandleType
    ht of
            HandleType
    ClosedHandle  -> forall a. Show a => a -> ShowS
    shows HandleType
    ht forall b c a. (b -> c) -> (a -> b) -> a -> c
    . String -> ShowS
    showString String
    "}"
            HandleType
    _ -> ShowS
    cont

        showBufMode :: Buffer e -> BufferMode -> ShowS
        showBufMode :: forall e. Buffer e -> BufferMode -> ShowS
    showBufMode Buffer e
    buf BufferMode
    bmo =
          case BufferMode
    bmo of
            BufferMode
    NoBuffering   -> String -> ShowS
    showString String
    "none"
            BufferMode
    LineBuffering -> String -> ShowS
    showString String
    "line"
            BlockBuffering (Just Int
    n) -> String -> ShowS
    showString String
    "block " forall b c a. (b -> c) -> (a -> b) -> a -> c
    . Bool -> ShowS -> ShowS
    showParen Bool
    True (forall a. Show a => a -> ShowS
    shows Int
    n)
            BlockBuffering Maybe Int
    Nothing  -> String -> ShowS
    showString String
    "block " forall b c a. (b -> c) -> (a -> b) -> a -> c
    . Bool -> ShowS -> ShowS
    showParen Bool
    True (forall a. Show a => a -> ShowS
    shows Int
    def)
          where
           def :: Int
           def :: Int
    def = forall e. Buffer e -> Int
    bufSize Buffer e
    buf