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diff --git NuttX/nuttx/include/wchar.h NuttX/nuttx/include/wchar.h
index 54fa796..889b272 100644
--- NuttX/nuttx/include/wchar.h
+++ NuttX/nuttx/include/wchar.h
@@ -118,7 +118,19 @@ typedef int wint_t;
* Reference: Opengroup.org
*/
-struct tm; /* Forward reference (see <time.h>) */
+ struct tm; /* Forward reference (see <time.h>) */
+
+/* An object type other than an array type that can hold the conversion state
+ * information necessary to convert between sequences of (possibly multi-byte)
+ * characters and wide characters. If a codeset is being
+ * used such that an mbstate_t needs to preserve more than two levels of
+ * reserved state, the results are unspecified.
+ */
+
+typedef struct
+{
+ int __fill[6];
+} mbstate_t;
/****************************************************************************
* Public Data
@@ -142,7 +154,18 @@ extern "C"
* Reference: Opengroup.org
*/
-#if 0 /* Not yet implemented */
+
+#ifndef _WCTYPE_T
+#define _WCTYPE_T
+# ifdef _AEABI_PORTABLE
+typedef void *wctype_t;
+# else
+typedef int wctype_t;
+# endif
+#endif /* !_WCTYPE_T */
+
+ /* Not yet implemented */
+
wint_t btowc(int);
int fwprintf(FILE *, const wchar_t *, ...);
int fwscanf(FILE *, const wchar_t *, ...);
@@ -218,7 +241,10 @@ wchar_t *wmemmove(wchar_t *, const wchar_t *, size_t);
wchar_t *wmemset(wchar_t *, wchar_t, size_t);
int wprintf(const wchar_t *, ...);
int wscanf(const wchar_t *, ...);
-#endif
+int vfwscanf(FILE *, const wchar_t *, va_list);
+int vswscanf(const wchar_t *, const wchar_t *, va_list);
+int vwscanf(const wchar_t *, va_list);
+float wcstof(const wchar_t *, wchar_t **);
#undef EXTERN
#ifdef __cplusplus
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