From f748b911c9157a0bb86f38280ddfba72a55049b6 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Thu, 18 Mar 2021 18:48:56 +0900
Subject: Fix infinite loop at illegal sequence [Bug #17729]

As mblen returns -1 on failure, skip the first byte and try the
succeeding bytes in that case.

Close https://github.com/ruby/ruby/pull/4281
---
 test/ruby/test_rubyoptions.rb | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'test')

diff --git a/test/ruby/test_rubyoptions.rb b/test/ruby/test_rubyoptions.rb
index 0d42604b87..e26a24e8ad 100644
--- a/test/ruby/test_rubyoptions.rb
+++ b/test/ruby/test_rubyoptions.rb
@@ -1089,6 +1089,11 @@ class TestRubyOptions < Test::Unit::TestCase
     end
   end
 
+  def test_rubylib_invalid_encoding
+    env = {"RUBYLIB"=>"\xFF", "LOCALE"=>"en_US.UTF-8", "LC_ALL"=>"en_US.UTF-8"}
+    assert_ruby_status([env, "-e;"])
+  end
+
   def test_null_script
     skip "#{IO::NULL} is not a character device" unless File.chardev?(IO::NULL)
     assert_in_out_err([IO::NULL], success: true)
-- 
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