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Diffstat (limited to 'libraries/base/GHC/IO/Windows/Paths.hs')
| -rw-r--r-- | libraries/base/GHC/IO/Windows/Paths.hs | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/libraries/base/GHC/IO/Windows/Paths.hs b/libraries/base/GHC/IO/Windows/Paths.hs new file mode 100644 index 0000000000..851dc37508 --- /dev/null +++ b/libraries/base/GHC/IO/Windows/Paths.hs @@ -0,0 +1,49 @@ +{-# LANGUAGE Trustworthy #-} +{-# LANGUAGE NoImplicitPrelude #-} +{-# LANGUAGE CPP #-} +-- Whether there are identities depends on the platform +{-# OPTIONS_HADDOCK hide #-} + +----------------------------------------------------------------------------- +-- | +-- Module : GHC.IO.Windows.Paths +-- Copyright : (c) The University of Glasgow, 2017 +-- License : see libraries/base/LICENSE +-- +-- Maintainer : libraries@haskell.org +-- Stability : internal +-- Portability : non-portable +-- +-- Windows FilePath handling utility for GHC code. +-- +----------------------------------------------------------------------------- + +module GHC.IO.Windows.Paths + (getDevicePath + ) where + +#include "windows_cconv.h" + +import GHC.Base +import GHC.IO + +import Foreign.C.String +import Foreign.Marshal.Alloc (free) + +foreign import WINDOWS_CCONV safe "__hs_create_device_name" + c_GetDevicePath :: CWString -> IO CWString + +-- | This function converts Windows paths between namespaces. More specifically +-- It converts an explorer style path into a NT or Win32 namespace. +-- This has several caveats but they are caviats that are native to Windows and +-- not POSIX. See +-- https://msdn.microsoft.com/en-us/library/windows/desktop/aa365247.aspx. +-- Anything else such as raw device paths we leave untouched. The main benefit +-- of doing any of this is that we can break the MAX_PATH restriction and also +-- access raw handles that we couldn't before. +getDevicePath :: FilePath -> IO FilePath +getDevicePath path + = do str <- withCWString path c_GetDevicePath + newPath <- peekCWString str + free str + return newPath |