* io.c (rb_io_init_copy): copy encs.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@18822 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,7 @@
+Sun Aug 24 19:40:13 2008  Tanaka Akira  <akr@fsij.org>
+
+	* io.c (rb_io_init_copy): copy encs.
+
 Sun Aug 24 19:17:31 2008  Tanaka Akira  <akr@fsij.org>
 
 	* io.c (rb_io_open): add an argument: vperm.

io.c

@@ -5075,6 +5075,7 @@ rb_io_init_copy(VALUE dest, VALUE io)
 
     /* copy rb_io_t structure */
     fptr->mode = orig->mode & ~FMODE_PREP;
+    fptr->encs = orig->encs;
     fptr->pid = orig->pid;
     fptr->lineno = orig->lineno;
     if (!NIL_P(orig->pathv)) fptr->pathv = orig->pathv;

test/ruby/test_io_m17n.rb

@@ -19,8 +19,8 @@ class TestIO_M17N < Test::Unit::TestCase
     }
   end
 
-  def with_pipe(enc=nil)
+  def with_pipe(*args)
-    r, w = IO.pipe(enc)
+    r, w = IO.pipe(*args)
     begin
       yield r, w
     ensure
@@ -239,6 +239,33 @@ EOT
     w.close if w && !w.closed?
   end
 
+  def test_dup
+    with_pipe("utf-8:euc-jp") {|r, w|
+      w << "\u3042"
+      w.close
+      r2 = r.dup
+      begin
+        assert_equal("\xA4\xA2".force_encoding("euc-jp"), r2.read)
+      ensure
+        r2.close
+      end
+
+    }
+  end
+
+  def test_dup_undef
+    with_pipe("utf-8:euc-jp", :undef=>:replace) {|r, w|
+      w << "\uFFFD"
+      w.close
+      r2 = r.dup
+      begin
+        assert_equal("?", r2.read)
+      ensure
+        r2.close
+      end
+    }
+  end
+
   def test_stdin
     assert_equal(Encoding.default_external, STDIN.external_encoding)
     assert_equal(nil, STDIN.internal_encoding)