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Description | |||||||||||||||||||||||||||||
String I/O functions | |||||||||||||||||||||||||||||
Synopsis | |||||||||||||||||||||||||||||
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Documentation | |||||||||||||||||||||||||||||
hWaitForInput :: Handle -> Int -> IO Bool | |||||||||||||||||||||||||||||
Computation hWaitForInput hdl t waits until input is available on handle hdl. It returns True as soon as input is available on hdl, or False if no input is available within t milliseconds. This operation may fail with:
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hGetChar :: Handle -> IO Char | |||||||||||||||||||||||||||||
Computation hGetChar hdl reads a character from the file or channel managed by hdl, blocking until a character is available. This operation may fail with:
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hGetLine :: Handle -> IO String | |||||||||||||||||||||||||||||
Computation hGetLine hdl reads a line from the file or channel managed by hdl. This operation may fail with:
If hGetLine encounters end-of-file at any other point while reading in a line, it is treated as a line terminator and the (partial) line is returned. | |||||||||||||||||||||||||||||
hGetContents :: Handle -> IO String | |||||||||||||||||||||||||||||
Computation hGetContents hdl returns the list of characters corresponding to the unread portion of the channel or file managed by hdl, which is put into an intermediate state, semi-closed. In this state, hdl is effectively closed, but items are read from hdl on demand and accumulated in a special list returned by hGetContents hdl. Any operation that fails because a handle is closed, also fails if a handle is semi-closed. The only exception is hClose. A semi-closed handle becomes closed:
Once a semi-closed handle becomes closed, the contents of the associated list becomes fixed. The contents of this final list is only partially specified: it will contain at least all the items of the stream that were evaluated prior to the handle becoming closed. Any I/O errors encountered while a handle is semi-closed are simply discarded. This operation may fail with:
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hPutChar :: Handle -> Char -> IO () | |||||||||||||||||||||||||||||
Computation hPutChar hdl ch writes the character ch to the file or channel managed by hdl. Characters may be buffered if buffering is enabled for hdl. This operation may fail with:
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hPutStr :: Handle -> String -> IO () | |||||||||||||||||||||||||||||
Computation hPutStr hdl s writes the string s to the file or channel managed by hdl. This operation may fail with:
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hGetBuf :: Handle -> Ptr a -> Int -> IO Int | |||||||||||||||||||||||||||||
hGetBuf hdl buf count reads data from the handle hdl into the buffer buf until either EOF is reached or count 8-bit bytes have been read. It returns the number of bytes actually read. This may be zero if EOF was reached before any data was read (or if count is zero). hGetBuf never raises an EOF exception, instead it returns a value smaller than count. If the handle is a pipe or socket, and the writing end is closed, hGetBuf will behave as if EOF was reached. | |||||||||||||||||||||||||||||
hGetBufNonBlocking :: Handle -> Ptr a -> Int -> IO Int | |||||||||||||||||||||||||||||
hPutBuf :: Handle -> Ptr a -> Int -> IO () | |||||||||||||||||||||||||||||
hPutBuf hdl buf count writes count 8-bit bytes from the buffer buf to the handle hdl. It returns (). This operation may fail with:
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hPutBufNonBlocking :: Handle -> Ptr a -> Int -> IO Int | |||||||||||||||||||||||||||||
slurpFile :: FilePath -> IO (Ptr (), Int) | |||||||||||||||||||||||||||||
memcpy_ba_baoff :: RawBuffer -> RawBuffer -> Int -> CSize -> IO (Ptr ()) | |||||||||||||||||||||||||||||
memcpy_ptr_baoff :: Ptr a -> RawBuffer -> Int -> CSize -> IO (Ptr ()) | |||||||||||||||||||||||||||||
memcpy_baoff_ba :: RawBuffer -> Int -> RawBuffer -> CSize -> IO (Ptr ()) | |||||||||||||||||||||||||||||
memcpy_baoff_ptr :: RawBuffer -> Int -> Ptr a -> CSize -> IO (Ptr ()) | |||||||||||||||||||||||||||||
Produced by Haddock version 0.6 |