From 8bd9203d49794ab89d04ac5387dc8430ba77b254 Mon Sep 17 00:00:00 2001
From: Gregory Nutt <gnutt@nuttx.org>
Date: Thu, 19 Feb 2015 09:21:35 -0600
Subject: [PATCH] Add mbstate_t to wchar.h and cwchar

---
 include/cxx/cwchar |  7 +++++++
 include/wchar.h    | 21 +++++++++++++++------
 2 files changed, 22 insertions(+), 6 deletions(-)

diff --git a/include/cxx/cwchar b/include/cxx/cwchar
index 60c261dada..eee3bb64b5 100755
--- a/include/cxx/cwchar
+++ b/include/cxx/cwchar
@@ -46,4 +46,11 @@
 // Namespace
 //***************************************************************************
 
+namespace std
+{
+  using ::mbstate_t;
+  using ::wint_t;
+  using ::size_t;
+};
+
 #endif // __INCLUDE_CXX_CWCHAR
diff --git a/include/wchar.h b/include/wchar.h
index 54fa796617..8f7d8ab28b 100644
--- a/include/wchar.h
+++ b/include/wchar.h
@@ -89,8 +89,11 @@
  *
  * wint_t
  *   An integral type capable of storing any valid value of wchar_t, or WEOF.
- *
- * wctype_t
+ */
+
+typedef int wint_t;
+
+/* wctype_t
  *   A scalar type of a data object that can hold values which represent
  *   locale-specific character classification.
  *
@@ -100,8 +103,16 @@
  *   multibyte) characters and wide-characters. If a codeset is being used
  *   such that an mbstate_t needs to preserve more than 2 levels of reserved
  *   state, the results are unspecified.
- *
- * FILE
+ */
+
+struct mbstate_s
+{
+  int __fill[6];
+};
+
+typedef struct mbstate_s mbstate_t;
+
+/* FILE
  *   As described in <stdio.h>.
  *
  * size_t
@@ -110,8 +121,6 @@
  * Reference: Opengroup.org
  */
 
-typedef int wint_t;
-
 /* "The tag tm is declared as naming an incomplete structure type, the
  *  contents of which are described in the header <time.h>."
  *