import PrelRead ( readParen, Read(..), reads, lex,
readIO
)
---import PrelNum ( toInteger )
-import PrelBounded () -- Bounded Int instance.
-import PrelEither ( Either(..) )
+import PrelShow
+import PrelMaybe ( Either(..), Maybe(..) )
import PrelAddr ( Addr(..), nullAddr )
import PrelArr ( ByteArray )
import PrelPack ( unpackNBytesAccST )
#ifndef HEAD
#ifdef __HUGS__
-#define cat2(x,y) x/**/y
-#define CCALL(fun) cat2(prim_,fun)
#define __CONCURRENT_HASKELL__
#define stToIO id
#define unpackNBytesAccST primUnpackCStringAcc
-#else
-#define CCALL(fun) _ccall_ fun
-#define ref_freeStdFileObject (``&freeStdFileObject''::Addr)
-#define ref_freeFileObject (``&freeFileObject''::Addr)
-#define const_BUFSIZ ``BUFSIZ''
#endif
\end{code}
hWaitForInput :: Handle -> Int -> IO Bool
hWaitForInput handle msecs =
wantReadableHandle "hWaitForInput" handle $ \ handle_ -> do
- rc <- CCALL(inputReady) (haFO__ handle_) (msecs::Int) -- ConcHask: SAFE, won't block
- writeHandle handle handle_
+ rc <- inputReady (haFO__ handle_) (msecs::Int) -- ConcHask: SAFE, won't block
case (rc::Int) of
0 -> return False
1 -> return True
hGetChar handle =
wantReadableHandle "hGetChar" handle $ \ handle_ -> do
let fo = haFO__ handle_
- intc <- mayBlock fo (CCALL(fileGetc) fo) -- ConcHask: UNSAFE, may block
- writeHandle handle handle_
+ intc <- mayBlock fo (fileGetc fo) -- ConcHask: UNSAFE, may block
if intc /= ((-1)::Int)
then return (chr intc)
else constructErrorAndFail "hGetChar"
+{-
+ If EOF is reached before EOL is encountered, ignore the
+ EOF and return the partial line. Next attempt at calling
+ hGetLine on the handle will yield an EOF IO exception though.
+-}
hGetLine :: Handle -> IO String
hGetLine h = do
c <- hGetChar h
- if c == '\n'
- then return ""
+ if c == '\n' then
+ return ""
else do
- s <- hGetLine h
- return (c:s)
+ l <- getRest
+ return (c:l)
+ where
+ getRest = do
+ c <-
+ catch
+ (hGetChar h)
+ (\ err -> do
+ if isEOFError err then
+ return '\n'
+ else
+ ioError err)
+ if c == '\n' then
+ return ""
+ else do
+ s <- getRest
+ return (c:s)
\end{code}
\begin{code}
hLookAhead :: Handle -> IO Char
-hLookAhead handle = do
+hLookAhead handle =
wantReadableHandle "hLookAhead" handle $ \ handle_ -> do
let fo = haFO__ handle_
- intc <- mayBlock fo (CCALL(fileLookAhead) fo) -- ConcHask: UNSAFE, may block
- writeHandle handle handle_
+ intc <- mayBlock fo (fileLookAhead fo) -- ConcHask: UNSAFE, may block
if intc /= (-1)
then return (chr intc)
else constructErrorAndFail "hLookAhead"
\begin{code}
hGetContents :: Handle -> IO String
hGetContents handle =
- wantReadableHandle "hGetContents" handle $ \ handle_ -> do
- {-
- To avoid introducing an extra layer of buffering here,
- we provide three lazy read methods, based on character,
- line, and block buffering.
- -}
- writeHandle handle (handle_{ haType__ = SemiClosedHandle })
- case (haBufferMode__ handle_) of
- LineBuffering -> unsafeInterleaveIO (lazyReadLine handle (haFO__ handle_))
- BlockBuffering _ -> unsafeInterleaveIO (lazyReadBlock handle (haFO__ handle_))
- NoBuffering -> unsafeInterleaveIO (lazyReadChar handle (haFO__ handle_))
-
+ -- can't use wantReadableHandle here, because we want to side effect
+ -- the handle.
+ withHandle handle $ \ handle_ -> do
+ case haType__ handle_ of
+ ErrorHandle theError -> ioError theError
+ ClosedHandle -> ioe_closedHandle "hGetContents" handle
+ SemiClosedHandle -> ioe_closedHandle "hGetContents" handle
+ AppendHandle -> ioError not_readable_error
+ WriteHandle -> ioError not_readable_error
+ _ -> do
+ {-
+ To avoid introducing an extra layer of buffering here,
+ we provide three lazy read methods, based on character,
+ line, and block buffering.
+ -}
+ let handle_' = handle_{ haType__ = SemiClosedHandle }
+ case (haBufferMode__ handle_) of
+ LineBuffering -> do
+ str <- unsafeInterleaveIO (lazyReadLine handle (haFO__ handle_))
+ return (handle_', str)
+ BlockBuffering _ -> do
+ str <- unsafeInterleaveIO (lazyReadBlock handle (haFO__ handle_))
+ return (handle_', str)
+ NoBuffering -> do
+ str <- unsafeInterleaveIO (lazyReadChar handle (haFO__ handle_))
+ return (handle_', str)
+ where
+ not_readable_error =
+ IOError (Just handle) IllegalOperation "hGetContents"
+ ("handle is not open for reading")
\end{code}
Note that someone may close the semi-closed handle (or change its buffering),
#endif
lazyReadBlock handle fo = do
- buf <- CCALL(getBufStart) fo (0::Int)
- bytes <- mayBlock fo (CCALL(readBlock) fo) -- ConcHask: UNSAFE, may block.
+ buf <- getBufStart fo 0
+ bytes <- mayBlock fo (readBlock fo) -- ConcHask: UNSAFE, may block.
case (bytes::Int) of
-3 -> -- buffering has been turned off, use lazyReadChar instead
lazyReadChar handle fo
-2 -> return ""
-1 -> -- an error occurred, close the handle
withHandle handle $ \ handle_ -> do
- CCALL(closeFile) (haFO__ handle_) (0::Int){-don't bother flushing-} -- ConcHask: SAFE, won't block.
- writeHandle handle (handle_ { haType__ = ClosedHandle,
- haFO__ = nullFile__ })
- return ""
+ closeFile (haFO__ handle_) 0{-don't bother flushing-} -- ConcHask: SAFE, won't block.
+ return (handle_ { haType__ = ClosedHandle,
+ haFO__ = nullFile__ },
+ "")
_ -> do
more <- unsafeInterleaveIO (lazyReadBlock handle fo)
stToIO (unpackNBytesAccST buf bytes more)
lazyReadLine handle fo = do
- bytes <- mayBlock fo (CCALL(readLine) fo) -- ConcHask: UNSAFE, may block.
+ bytes <- mayBlock fo (readLine fo) -- ConcHask: UNSAFE, may block.
case (bytes::Int) of
-3 -> -- buffering has been turned off, use lazyReadChar instead
lazyReadChar handle fo
-2 -> return "" -- handle closed by someone else, stop reading.
-1 -> -- an error occurred, close the handle
withHandle handle $ \ handle_ -> do
- CCALL(closeFile) (haFO__ handle_) (0::Int){- don't bother flushing-} -- ConcHask: SAFE, won't block
- writeHandle handle (handle_ { haType__ = ClosedHandle,
- haFO__ = nullFile__ })
- return ""
+ closeFile (haFO__ handle_) 0{- don't bother flushing-} -- ConcHask: SAFE, won't block
+ return (handle_ { haType__ = ClosedHandle,
+ haFO__ = nullFile__ },
+ "")
_ -> do
more <- unsafeInterleaveIO (lazyReadLine handle fo)
- buf <- CCALL(getBufStart) fo bytes -- ConcHask: won't block
+ buf <- getBufStart fo bytes -- ConcHask: won't block
stToIO (unpackNBytesAccST buf bytes more)
lazyReadChar handle fo = do
- char <- mayBlock fo (CCALL(readChar) fo) -- ConcHask: UNSAFE, may block.
+ char <- mayBlock fo (readChar fo) -- ConcHask: UNSAFE, may block.
case (char::Int) of
-4 -> -- buffering is now block-buffered, use lazyReadBlock instead
lazyReadBlock handle fo
-2 -> return ""
-1 -> -- error, silently close handle.
withHandle handle $ \ handle_ -> do
- CCALL(closeFile) (haFO__ handle_) (0::Int){-don't bother flusing-} -- ConcHask: SAFE, won't block
- writeHandle handle (handle_{ haType__ = ClosedHandle,
- haFO__ = nullFile__ })
- return ""
+ closeFile (haFO__ handle_) 0{-don't bother flusing-} -- ConcHask: SAFE, won't block
+ return (handle_{ haType__ = ClosedHandle,
+ haFO__ = nullFile__ },
+ "")
_ -> do
more <- unsafeInterleaveIO (lazyReadChar handle fo)
return (chr char : more)
hPutChar handle c =
wantWriteableHandle "hPutChar" handle $ \ handle_ -> do
let fo = haFO__ handle_
- rc <- mayBlock fo (CCALL(filePutc) fo c) -- ConcHask: UNSAFE, may block.
- writeHandle handle handle_
+ flushConnectedBuf fo
+ rc <- mayBlock fo (filePutc fo c) -- ConcHask: UNSAFE, may block.
if rc == 0
then return ()
else constructErrorAndFail "hPutChar"
hPutStr handle str =
wantWriteableHandle "hPutStr" handle $ \ handle_ -> do
let fo = haFO__ handle_
+ flushConnectedBuf fo
case haBufferMode__ handle_ of
LineBuffering -> do
- buf <- CCALL(getWriteableBuf) fo
- pos <- CCALL(getBufWPtr) fo
- bsz <- CCALL(getBufSize) fo
+ buf <- getWriteableBuf fo
+ pos <- getBufWPtr fo
+ bsz <- getBufSize fo
writeLines fo buf bsz pos str
BlockBuffering _ -> do
- buf <- CCALL(getWriteableBuf) fo
- pos <- CCALL(getBufWPtr) fo
- bsz <- CCALL(getBufSize) fo
+ buf <- getWriteableBuf fo
+ pos <- getBufWPtr fo
+ bsz <- getBufSize fo
writeBlocks fo buf bsz pos str
NoBuffering -> do
writeChars fo str
- writeHandle handle handle_
-
\end{code}
Going across the border between Haskell and C is relatively costly,
case ls of
[] ->
if n == 0 then
- CCALL(setBufWPtr) obj (0::Int)
+ setBufWPtr obj 0{-new pos-}
else do
{-
At the end of a buffer write, update the buffer position
that killing of threads is supported at the moment.
-}
- CCALL(setBufWPtr) obj n
+ setBufWPtr obj n
(x:xs) -> do
primWriteCharOffAddr buf n x
{- Flushing on buffer exhaustion or newlines (even if it isn't the last one) -}
if n == bufLen || x == '\n'
then do
- rc <- mayBlock obj (CCALL(writeFileObject) obj (n + 1)) -- ConcHask: UNSAFE, may block.
+ rc <- mayBlock obj (writeFileObject obj (n + 1)) -- ConcHask: UNSAFE, may block.
if rc == 0
then shoveString 0 xs
else constructErrorAndFail "writeLines"
case ls of
[] ->
if n ==# 0# then
- CCALL(setBufWPtr) obj (0::Int)
+ setBufWPtr obj 0
else do
{-
At the end of a buffer write, update the buffer position
that killing of threads is supported at the moment.
-}
- CCALL(setBufWPtr) obj (I# n)
+ setBufWPtr obj (I# n)
((C# x):xs) -> do
write_char buf n x
{- Flushing on buffer exhaustion or newlines (even if it isn't the last one) -}
if n ==# bufLen || x `eqChar#` '\n'#
then do
- rc <- mayBlock obj (CCALL(writeFileObject) obj (I# (n +# 1#))) -- ConcHask: UNSAFE, may block.
+ rc <- mayBlock obj (writeFileObject obj (I# (n +# 1#))) -- ConcHask: UNSAFE, may block.
if rc == 0
then shoveString 0# xs
else constructErrorAndFail "writeLines"
case ls of
[] ->
if n == 0 then
- CCALL(setBufWPtr) obj (0::Int)
+ setBufWPtr obj (0::Int)
else do
{-
At the end of a buffer write, update the buffer position
alltogether.
-}
- CCALL(setBufWPtr) obj n
+ setBufWPtr obj n
(x:xs) -> do
primWriteCharOffAddr buf n x
if n == bufLen
then do
- rc <- mayBlock obj (CCALL(writeFileObject) obj (n + 1)) -- ConcHask: UNSAFE, may block.
+ rc <- mayBlock obj (writeFileObject obj (n + 1)) -- ConcHask: UNSAFE, may block.
if rc == 0
then shoveString 0 xs
else constructErrorAndFail "writeChunks"
case ls of
[] ->
if n ==# 0# then
- CCALL(setBufWPtr) obj (0::Int)
+ setBufWPtr obj (0::Int)
else do
{-
At the end of a buffer write, update the buffer position
alltogether.
-}
- CCALL(setBufWPtr) obj (I# n)
+ setBufWPtr obj (I# n)
((C# x):xs) -> do
write_char buf n x
if n ==# bufLen
then do
- rc <- mayBlock obj (CCALL(writeFileObject) obj (I# (n +# 1#))) -- ConcHask: UNSAFE, may block.
+ rc <- mayBlock obj (writeFileObject obj (I# (n +# 1#))) -- ConcHask: UNSAFE, may block.
if rc == 0
then shoveString 0# xs
else constructErrorAndFail "writeChunks"
#endif
writeChars _fo "" = return ()
writeChars fo (c:cs) = do
- rc <- mayBlock fo (CCALL(filePutc) fo c) -- ConcHask: UNSAFE, may block.
+ rc <- mayBlock fo (filePutc fo c) -- ConcHask: UNSAFE, may block.
if rc == 0
then writeChars fo cs
else constructErrorAndFail "writeChars"
projects / ghc-hetmet.git / blobdiff