openssl/buffering: fix gets on EOF with limit

* ext/openssl/lib/openssl/buffering.rb (gets):
  avoid comparing fixnum with nil
* test/openssl/test_pair.rb: test gets with limit when EOF is hit
  Thanks to Bar Hofesh <bar.hofesh@safe-t.com> for the bug report
  and testing.
  [ruby-core:70149] [Bug #11400]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@51466 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,12 @@
+Sun Aug  2 07:01:17 2015  Eric Wong  <e@80x24.org>
+
+	* ext/openssl/lib/openssl/buffering.rb (gets):
+	  avoid comparing fixnum with nil
+	* test/openssl/test_pair.rb: test gets with limit when EOF is hit
+	  Thanks to Bar Hofesh <bar.hofesh@safe-t.com> for the bug report
+	  and testing.
+	  [ruby-core:70149] [Bug #11400]
+
 Sat Aug  1 17:13:15 2015  Kazuki Tsujimoto  <kazuki@callcc.net>
 
 	* lib/net/http/response.rb (Net::HTTPResponse::Inflater#finish):

ext/openssl/lib/openssl/buffering.rb

@@ -213,7 +213,7 @@ module OpenSSL::Buffering
     else
       size = idx ? idx+eol.size : nil
     end
-    if limit and limit >= 0
+    if size && limit && limit >= 0
       size = [size, limit].min
     end
     consume_rbuff(size)

test/openssl/test_pair.rb

@@ -110,6 +110,14 @@ module OpenSSL::TestPairM
     }
   end
 
+  def test_gets_eof_limit
+    ssl_pair {|s1, s2|
+      s1.write("hello")
+      s1.close # trigger EOF
+      assert_match "hello", s2.gets("\n", 6), "[ruby-core:70149] [Bug #11140]"
+    }
+  end
+
   def test_readpartial
     ssl_pair {|s1, s2|
       s2.write "a\nbcd"