stdin, stdout, stderr,
IOMode(..), openFile, openBinaryFile, fdToHandle_stat, fdToHandle, fdToHandle',
- hFileSize, hSetFileSize, hIsEOF, isEOF, hLookAhead, hSetBuffering, hSetBinaryMode,
+ hFileSize, hSetFileSize, hIsEOF, isEOF, hLookAhead, hLookAhead', hSetBuffering, hSetBinaryMode,
hFlush, hDuplicate, hDuplicateTo,
hClose, hClose_help,
-- * 'isEOFError' if the end of file has been reached.
hLookAhead :: Handle -> IO Char
-hLookAhead handle = do
- wantReadableHandle "hLookAhead" handle $ \handle_ -> do
+hLookAhead handle =
+ wantReadableHandle "hLookAhead" handle hLookAhead'
+
+hLookAhead' :: Handle__ -> IO Char
+hLookAhead' handle_ = do
let ref = haBuffer handle_
fd = haFD handle_
is_line = haBufferMode handle_ == LineBuffering
new_buf <- if bufferEmpty buf
then fillReadBuffer fd True (haIsStream handle_) buf
else return buf
-
+
writeIORef ref new_buf
(c,_) <- readCharFromBuffer (bufBuf buf) (bufRPtr buf)