[llvm] r186595 - Small improvement to the use of GetFileType:

[Rafael Espindola]

Author: rafael
Date: Thu Jul 18 13:42:52 2013
New Revision: 186595

URL: http://llvm.org/viewvc/llvm-project?rev=186595&view=rev
Log:
Small improvement to the use of GetFileType:

* assert that the return value is one of the documented values on msdn.
* on FILE_TYPE_UNKNOWN, check GetLastError.

Unfortunately I can't think of a way to get a FILE_TYPE_UNKNOWN on a test.

Modified:
    llvm/trunk/lib/Support/Windows/Path.inc

Modified: llvm/trunk/lib/Support/Windows/Path.inc
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Support/Windows/Path.inc?rev=186595&r1=186594&r2=186595&view=diff
==============================================================================
--- llvm/trunk/lib/Support/Windows/Path.inc (original)
+++ llvm/trunk/lib/Support/Windows/Path.inc Thu Jul 18 13:42:52 2013
@@ -581,7 +581,14 @@ static error_code getStatus(HANDLE FileH
 
   switch (::GetFileType(FileHandle)) {
   default:
-  case FILE_TYPE_UNKNOWN:
+    llvm_unreachable("Don't know anything about this file type");
+  case FILE_TYPE_UNKNOWN: {
+    DWORD Err = ::GetLastError();
+    if (Err != NO_ERROR)
+      return windows_error(Err);
+    Result = file_status(file_type::type_unknown);
+    return error_code::success();
+  }
   case FILE_TYPE_DISK:
     break;
   case FILE_TYPE_CHAR: