1 files changed, 40 insertions, 0 deletions
diff --git a/Utility/Path/Max.hs b/Utility/Path/Max.hs
new file mode 100644
index 000000000..4a810e591
--- /dev/null
+++ b/Utility/Path/Max.hs
@@ -0,0 +1,40 @@
+{- path manipulation
+ -
+ - Copyright 2010-2014 Joey Hess <id@joeyh.name>
+ -
+ - License: BSD-2-clause
+ -}
+
+{-# LANGUAGE CPP #-}
+{-# OPTIONS_GHC -fno-warn-tabs #-}
+
+module Utility.Path.Max where
+
+import System.FilePath
+import Data.List
+import Control.Applicative
+import Prelude
+
+#ifndef mingw32_HOST_OS
+import Utility.Exception
+import System.Posix.Files
+#endif
+
+{- Maximum size to use for a file in a specified directory.
+ -
+ - Many systems have a 255 byte limit to the name of a file, 
+ - so that's taken as the max if the system has a larger limit, or has no
+ - limit.
+ -}
+fileNameLengthLimit :: FilePath -> IO Int
+#ifdef mingw32_HOST_OS
+fileNameLengthLimit _ = return 255
+#else
+fileNameLengthLimit dir = do
+	-- getPathVar can fail due to statfs(2) overflow
+	l <- catchDefaultIO 0 $
+		fromIntegral <$> getPathVar dir FileNameLimit
+	if l <= 0
+		then return 255
+		else return $ minimum [l, 255]
+#endif