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import System.IO
import GHC.IO.Handle
import Control.Monad
import Data.List (intercalate)
newlines = ["\n","\r","\r\n","\n\r","\n\n","\r\r"]
-- make sure the file ends in '\r': that's a tricky case for CRLF
-- conversion, because the IO library has to check whether there's a
-- following \n before returning the \r.
content = concat [ show i ++ t | (i,t) <- zip [1..100] (cycle newlines) ]
filename = "newline001.out"
fromCRLF [] = []
fromCRLF ('\r':'\n':cs) = '\n' : fromCRLF cs
fromCRLF (c:cs) = c : fromCRLF cs
toCRLF [] = []
toCRLF ('\n':cs) = '\r':'\n': toCRLF cs
toCRLF (c:cs) = c : toCRLF cs
main = do
h <- openBinaryFile filename WriteMode
hPutStr h content
hClose h
testinput NoBuffering
testinput LineBuffering
testinput (BlockBuffering Nothing)
testinput (BlockBuffering (Just 3))
testinput (BlockBuffering (Just 7))
testinput (BlockBuffering (Just 16))
testoutput NoBuffering
testoutput LineBuffering
testoutput (BlockBuffering Nothing)
testoutput (BlockBuffering (Just 3))
testoutput (BlockBuffering (Just 7))
testoutput (BlockBuffering (Just 16))
testinput b = do
h <- openFile filename ReadMode
hSetBuffering h b
hSetNewlineMode h noNewlineTranslation
str <- hGetContents h
check "in1" b str content
hClose h
h <- openFile filename ReadMode
hSetBuffering h b
hSetNewlineMode h noNewlineTranslation
str <- read_chars h
check "in2" b str content
hClose h
h <- openFile filename ReadMode
hSetBuffering h b
hSetNewlineMode h noNewlineTranslation
str <- read_lines h
check "in3" b str content
hClose h
h <- openFile filename ReadMode
hSetBuffering h b
hSetNewlineMode h NewlineMode{ inputNL=CRLF, outputNL=LF }
str <- hGetContents h
check "in4" b str (fromCRLF content)
hClose h
h <- openFile filename ReadMode
hSetBuffering h b
hSetNewlineMode h NewlineMode{ inputNL=CRLF, outputNL=LF }
str <- read_chars h
check "in5" b str (fromCRLF content)
hClose h
h <- openFile filename ReadMode
hSetBuffering h b
hSetNewlineMode h NewlineMode{ inputNL=CRLF, outputNL=LF }
str <- read_lines h
check "in6" b str (fromCRLF content)
hClose h
testoutput b = do
h <- openFile filename WriteMode
hSetBuffering h b
hSetNewlineMode h NewlineMode{ inputNL=LF, outputNL=CRLF }
hPutStr h content
hClose h
h <- openBinaryFile filename ReadMode
str <- hGetContents h
check "out1" b (toCRLF content) str
hClose h
h <- openFile filename WriteMode
hSetBuffering h b
hSetNewlineMode h NewlineMode{ inputNL=LF, outputNL=CRLF }
mapM_ (hPutChar h) content
hClose h
h <- openBinaryFile filename ReadMode
str <- hGetContents h
check "out2" b (toCRLF content) str
hClose h
check s b str1 str2 =
when (str1 /= str2) $ error ("failed: " ++ s ++ ", " ++ show b ++ '\n':show str1 ++ '\n':show str2)
read_chars :: Handle -> IO String
read_chars h = loop h ""
where loop h acc = do
b <- hIsEOF h
if b then return (reverse acc) else do
c <- hGetChar h
loop h (c:acc)
read_lines :: Handle -> IO String
read_lines h = loop h []
where loop h acc = do
b <- hIsEOF h
if b then return (intercalate "\n" (reverse acc)) else do
l <- hGetLine h
loop h (l : acc)
|
