merges r30648 from trunk into ruby_1_9_2.

--
* string.c (rb_string_value_cstr): rb_str_modify can change
  RSTRING_PTR.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_2@30694 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 17 insertions, 0 deletions

diff --git a/test/-ext-/string/test_cstr.rb b/test/-ext-/string/test_cstr.rb
new file mode 100644
index 0000000000..8c0bb136ad
--- /dev/null
+++ b/test/-ext-/string/test_cstr.rb
@@ -0,0 +1,17 @@
+require 'test/unit'
+require "-test-/string/string"
+
+class Test_StringCStr < Test::Unit::TestCase
+  Bug4319 = '[ruby-dev:43094]'
+
+  def test_embed
+    s = Bug::String.new("abcdef")
+    s.set_len(3)
+    assert_equal(0, s.cstr_term, Bug4319)
+  end
+
+  def test_long
+    s = Bug::String.new("abcdef")*100000
+    assert_equal(0, s.cstr_term, Bug4319)
+  end
+end