Fix #3189: use System.Win32.getFullPathName

diff --git a/System/Directory.hs b/System/Directory.hs
index 86e852f..3455f4d 100644 (file)
--- a/System/Directory.hs
+++ b/System/Directory.hs
@@ -629,15 +629,14 @@ copyFile fromFPath toFPath =
 -- attempt.
 canonicalizePath :: FilePath -> IO FilePath
 canonicalizePath fpath =
-  withCString fpath $ \pInPath ->
-  allocaBytes long_path_size $ \pOutPath ->
 #if defined(mingw32_HOST_OS)
-  alloca $ \ppFilePart ->
-    do c_GetFullPathName pInPath (fromIntegral long_path_size) pOutPath ppFilePart
+    do path <- System.Win32.getFullPathName fpath
 #else
+  withCString fpath $ \pInPath ->
+  allocaBytes long_path_size $ \pOutPath ->
     do c_realpath pInPath pOutPath
-#endif
        path <- peekCString pOutPath
+#endif
        return (normalise path)
         -- normalise does more stuff, like upper-casing the drive letter