diff --git a/libc/stdio/wcio.h b/libc/stdio/wcio.h
index dd6db21..584a3f2 100644
--- a/libc/stdio/wcio.h
+++ b/libc/stdio/wcio.h
@@ -1,34 +1,34 @@
-/*
- * Copyright (C) 2008 The Android Open Source Project
+/*	$OpenBSD: wcio.h,v 1.2 2013/04/17 17:40:35 tedu Exp $	*/
+/* $NetBSD: wcio.h,v 1.3 2003/01/18 11:30:00 thorpej Exp $ */
+
+/*-
+ * Copyright (c)2001 Citrus Project,
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
- *  * Redistributions of source code must retain the above copyright
+ * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
- *  * Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in
- *    the documentation and/or other materials provided with the
- *    distribution.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
  *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
- * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
- * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
- * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
+ *
+ * $Citrus$
  */
 
-/* this file is only used to quiet the BSD stdio implementation
- * since we don't implement wchar support at all
- */
 #ifndef _WCIO_H_
 #define _WCIO_H_
 
@@ -36,22 +36,46 @@
 #define WCIO_UNGETWC_BUFSIZE 1
 
 struct wchar_io_data {
-        int dummy;
+	mbstate_t wcio_mbstate_in;
+	mbstate_t wcio_mbstate_out;
+
+	wchar_t wcio_ungetwc_buf[WCIO_UNGETWC_BUFSIZE];
+	size_t wcio_ungetwc_inbuf;
+
+	int wcio_mode; /* orientation */
 };
 
-/* BIONIC: disable wchar support */
 #define WCIO_GET(fp) \
-	((struct wchar_io_data*) 0)
+	(_EXT(fp) ? &(_EXT(fp)->_wcio) : (struct wchar_io_data *)0)
 
-#define _SET_ORIENTATION(fp, mode) ((void)0)
+#define _SET_ORIENTATION(fp, mode) \
+do {\
+	struct wchar_io_data *_wcio = WCIO_GET(fp); \
+	if (_wcio && _wcio->wcio_mode == 0) \
+		_wcio->wcio_mode = (mode);\
+} while (0)
 
 /*
  * WCIO_FREE should be called by fclose
  */
-#define WCIO_FREE(fp) ((void)(0))
+#define WCIO_FREE(fp) \
+do {\
+	struct wchar_io_data *_wcio = WCIO_GET(fp); \
+	if (_wcio) { \
+		_wcio->wcio_mode = 0;\
+		_wcio->wcio_ungetwc_inbuf = 0;\
+	} \
+} while (0)
 
-#define WCIO_FREEUB(fp) ((void)0)
+#define WCIO_FREEUB(fp) \
+do {\
+	struct wchar_io_data *_wcio = WCIO_GET(fp); \
+	if (_wcio) { \
+		_wcio->wcio_ungetwc_inbuf = 0;\
+	} \
+} while (0)
 
-#define WCIO_INIT(fp)  ((void)0)
+#define WCIO_INIT(fp) \
+	memset(&(_EXT(fp)->_wcio), 0, sizeof(struct wchar_io_data))
 
 #endif /*_WCIO_H_*/