transcode.c: empty encoding name

* transcode.c (rb_econv_set_replacement): target encoding name can
  be empty now.  [ruby-core:69841] [Bug #11324]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@51116 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

3 files changed, 15 insertions, 1 deletions

diff --git a/ChangeLog b/ChangeLog
index 07c011544d..9316512522 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Fri Jul  3 12:25:19 2015  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* transcode.c (rb_econv_set_replacement): target encoding name can
+	  be empty now.  [ruby-core:69841] [Bug #11324]
+
 Fri Jul  3 07:21:06 2015  Eric Wong  <e@80x24.org>
 
 	* benchmark/bm_io_nonblock_noex.rb: new benchmark
diff --git a/test/ruby/test_transcode.rb b/test/ruby/test_transcode.rb
index 8ace00c172..4bade11a51 100644
--- a/test/ruby/test_transcode.rb
+++ b/test/ruby/test_transcode.rb
@@ -2109,4 +2109,13 @@ class TestTranscode < Test::Unit::TestCase
       assert_equal([expected]*num, result, bug11277)
     end;
   end
+
+  def test_universal_newline
+    bug11324 = '[ruby-core:69841] [Bug #11324]'
+    usascii = Encoding::US_ASCII
+    s = "A\nB\r\nC".force_encoding(usascii)
+    assert_equal("A\nB\nC", s.encode(usascii, universal_newline: true), bug11324)
+    assert_equal("A\nB\nC", s.encode(usascii, universal_newline: true, undef: :replace), bug11324)
+    assert_equal("A\nB\nC", s.encode(usascii, universal_newline: true, undef: :replace, replace: ''), bug11324)
+  end
 end
diff --git a/transcode.c b/transcode.c
index b9d0adc553..5e20fd73a4 100644
--- a/transcode.c
+++ b/transcode.c
@@ -2199,7 +2199,7 @@ rb_econv_set_replacement(rb_econv_t *ec,
 
     encname2 = rb_econv_encoding_to_insert_output(ec);
 
-    if (encoding_equal(encname, encname2)) {
+    if (!*encname2 || encoding_equal(encname, encname2)) {
         str2 = xmalloc(len);
         MEMCPY(str2, str, unsigned char, len); /* xxx: str may be invalid */
         len2 = len;