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|
{- disk free space checking
-
- Copyright 2012 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
{-# LANGUAGE ForeignFunctionInterface, CPP #-}
module Utility.DiskFree ( getDiskFree ) where
#ifdef WITH_CLIBS
import Common
import Foreign.C.Types
import Foreign.C.String
import Foreign.C.Error
foreign import ccall safe "libdiskfree.h diskfree" c_diskfree
:: CString -> IO CULLong
getDiskFree :: FilePath -> IO (Maybe Integer)
getDiskFree path = withFilePath path $ \c_path -> do
free <- c_diskfree c_path
ifM (safeErrno <$> getErrno)
( return $ Just $ toInteger free
, return Nothing
)
where
safeErrno (Errno v) = v == 0
#else
#ifdef mingw32_HOST_OS
import System.Win32.File
getDiskFree :: FilePath -> IO (Maybe Integer)
getDiskFree path = catchMaybeIO $ do
(sectors, bytes, nfree, _ntotal) <- getDiskFreeSpace (Just path)
return $ toInteger sectors * toInteger bytes * toInteger nfree
#else
getDiskFree :: FilePath -> IO (Maybe Integer)
getDiskFree _ = return Nothing
#endif
#endif
|
