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import System.IO
import Foreign
import Foreign.C
import Control.Monad
main = do test True; test False
test blocking = do
h <- openBinaryFile "hGetBuf003.hs" ReadMode
let sz = 42
loop = do
-- mix ordinary char buffering with hGetBuf
eof <- hIsEOF h
when (not eof) $ hGetChar h >>= putChar
b <- allocaBytes sz $ \ptr -> do
r <- (if blocking then hGetBuf else hGetBufNonBlocking) h ptr sz
if (r == 0)
then return True
else do s <- peekCStringLen (ptr,r)
putStr s
return False
if b then return () else loop -- tail call
loop
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