40 lines
900 B
Haskell
40 lines
900 B
Haskell
{- path manipulation
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-
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- Copyright 2010-2014 Joey Hess <id@joeyh.name>
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-
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- License: BSD-2-clause
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-}
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{-# LANGUAGE CPP #-}
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{-# OPTIONS_GHC -fno-warn-tabs #-}
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module Utility.Path.Max where
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import System.FilePath
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#ifndef mingw32_HOST_OS
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import Utility.Exception
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import System.Posix.Files
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import Data.List
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import Control.Applicative
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import Prelude
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#endif
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{- Maximum size to use for a file in a specified directory.
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-
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- Many systems have a 255 byte limit to the name of a file,
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- so that's taken as the max if the system has a larger limit, or has no
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- limit.
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-}
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fileNameLengthLimit :: FilePath -> IO Int
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#ifdef mingw32_HOST_OS
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fileNameLengthLimit _ = return 255
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#else
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fileNameLengthLimit dir = do
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-- getPathVar can fail due to statfs(2) overflow
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l <- catchDefaultIO 0 $
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fromIntegral <$> getPathVar dir FileNameLimit
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if l <= 0
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then return 255
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else return $ minimum [l, 255]
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#endif
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