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{- disk free space checking
-
- Copyright 2012, 2014 Joey Hess <id@joeyh.name>
-
- License: BSD-2-clause
-}
{-# LANGUAGE ForeignFunctionInterface, CPP #-}
module Utility.DiskFree (
getDiskFree,
getDiskSize
) 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
foreign import ccall safe "libdiskfree.h disksize" c_disksize
:: CString -> IO CULLong
getVal :: (CString -> IO CULLong) -> FilePath -> IO (Maybe Integer)
getVal getter path = withFilePath path $ \c_path -> do
free <- getter c_path
ifM (safeErrno <$> getErrno)
( return $ Just $ toInteger free
, return Nothing
)
where
safeErrno (Errno v) = v == 0
getDiskFree :: FilePath -> IO (Maybe Integer)
getDiskFree = getVal c_diskfree
getDiskSize :: FilePath -> IO (Maybe Integer)
getDiskSize = getVal c_disksize
#else
#ifdef mingw32_HOST_OS
import Common
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
getDiskSize :: FilePath -> IO (Maybe Integer)
getDiskSize _ = return Nothing
#else
#warning Building without disk free space checking support
getDiskFree :: FilePath -> IO (Maybe Integer)
getDiskFree _ = return Nothing
getDiskSize :: FilePath -> IO (Maybe Integer)
getDiskSize _ = return Nothing
#endif
#endif
|
