Optimize winnt_stat

* test/ruby/test_file_exhaustive.rb
  (TestFileExhaustive#test_stat_special_file): add a test.
  GetFileAttributesExW fails to get attributes of special files
  such as pagefile.sys.

* win32/win32.c (check_valid_dir): for performance, check the path
  by FindFirstFileW only if the path containts "..."

* win32/win32.c (winnt_stat): use GetFileAttributesExW instead of
  FindFirstFileW since GetFileAttributesExW is faster.
  Based on the patch by Dusan D. Majkic.
  [ruby-core:47083] [Feature #6845]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@36668 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 7 insertions, 0 deletions

diff --git a/test/ruby/test_file_exhaustive.rb b/test/ruby/test_file_exhaustive.rb
index de17d7ee39..434c93c7e2 100644
--- a/test/ruby/test_file_exhaustive.rb
+++ b/test/ruby/test_file_exhaustive.rb
@@ -819,6 +819,13 @@ class TestFileExhaustive < Test::Unit::TestCase
     assert_equal(0, File::Stat.new(@zerofile).size)
   end
 
+  def test_stat_special_file
+    # test for special files such as pagefile.sys on Windows
+    assert_nothing_raised do
+      Dir::glob("C:/*.sys") {|f| File::Stat.new(f) }
+    end
+  end if DRIVE
+
   def test_path_check
     assert_nothing_raised { ENV["PATH"] }
   end