stringio.c: don't raise after close

* ext/stringio/stringio.c (strio_close): don't raise on dobule
  close for consistent to IO#close.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49962 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Fri Mar 13 15:04:36 2015  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* ext/stringio/stringio.c (strio_close): don't raise on dobule
+	  close for consistent to IO#close.
+
 Fri Mar 13 15:03:20 2015  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* io.c (rb_io_close_read, rb_io_close_write): don't raise after

ext/stringio/stringio.c

@@ -360,8 +360,8 @@ strio_close(VALUE self)
 static VALUE
 strio_close_read(VALUE self)
 {
-    StringIO(self);
-    if (!READABLE(self)) {
+    struct StringIO *ptr = StringIO(self);
+    if (!(ptr->flags & FMODE_READABLE)) {
 	rb_raise(rb_eIOError, "closing non-duplex IO for reading");
     }
     RBASIC(self)->flags &= ~STRIO_READABLE;
@@ -378,8 +378,8 @@ strio_close_read(VALUE self)
 static VALUE
 strio_close_write(VALUE self)
 {
-    StringIO(self);
-    if (!WRITABLE(self)) {
+    struct StringIO *ptr = StringIO(self);
+    if (!(ptr->flags & FMODE_WRITABLE)) {
 	rb_raise(rb_eIOError, "closing non-duplex IO for writing");
     }
     RBASIC(self)->flags &= ~STRIO_WRITABLE;

test/stringio/test_stringio.rb

@@ -207,7 +207,7 @@ class TestStringIO < Test::Unit::TestCase
     f = StringIO.new("")
     f.close_read
     assert_raise(IOError) { f.read }
-    assert_raise(IOError) { f.close_read }
+    assert_nothing_raised(IOError) {f.close_read}
     f.close
 
     f = StringIO.new("", "w")
@@ -221,7 +221,7 @@ class TestStringIO < Test::Unit::TestCase
     f = StringIO.new("")
     f.close_write
     assert_raise(IOError) { f.write("foo") }
-    assert_raise(IOError) { f.close_write }
+    assert_nothing_raised(IOError) {f.close_write}
     f.close
 
     f = StringIO.new("", "r")