* ext/stringio/stringio.c (strio_write): insufficiently filled string

  being extended when overwriting.  [ruby-core:03836]


git-svn-id: http://svn.ruby-lang.org/repos/ruby/trunk@7417 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 10 insertions, 0 deletions

diff --git a/test/stringio/test_stringio.rb b/test/stringio/test_stringio.rb
index fee305e85..de15ab550 100644
--- a/test/stringio/test_stringio.rb
+++ b/test/stringio/test_stringio.rb
@@ -30,4 +30,14 @@ class TestStringIO < Test::Unit::TestCase
     io.print "last"
     assert_equal("\0" * n + "last", io.string)
   end
+
+  def test_overwrite # [ruby-core:03836]
+    stringio = StringIO.new
+    responses = ['', 'just another ruby', 'hacker']
+    responses.each do |resp|
+      stringio.puts(resp)
+      stringio.rewind
+    end
+    assert_equal("hacker\nother ruby\n", stringio.string)
+  end
 end