sprintf.c: infect

* sprintf.c (ruby__sfvextra): the result should be infected by the
  given strings.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@36707 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 22 insertions, 0 deletions

diff --git a/test/-ext-/test_printf.rb b/test/-ext-/test_printf.rb
index fc4e065345..4c4001654a 100644
--- a/test/-ext-/test_printf.rb
+++ b/test/-ext-/test_printf.rb
@@ -28,4 +28,26 @@ class Test_SPrintf < Test::Unit::TestCase
     end
     assert_equal("<\u{3042 3044 3046 3048 304a}>", Bug::Printf.s(self))
   end
+
+  def test_taint
+    def self.to_s
+      super.taint
+    end
+    assert_equal({to_s: true, inspect: true},
+                 {
+                   to_s: Bug::Printf.s(self).tainted?,
+                   inspect: Bug::Printf.v(self).tainted?,
+                 })
+  end
+
+  def test_trust
+    def self.to_s
+      super.untrust
+    end
+    assert_equal({to_s: true, inspect: true},
+                 {
+                   to_s: Bug::Printf.s(self).untrusted?,
+                   inspect: Bug::Printf.v(self).untrusted?,
+                 })
+  end
 end