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-rw-r--r--include/wchar.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/include/wchar.h b/include/wchar.h
index a9cd440eec..f69463f57a 100644
--- a/include/wchar.h
+++ b/include/wchar.h
@@ -113,5 +113,12 @@ extern int __vfwprintf (__FILE *__restrict __s,
 /* Internal functions.  */
 extern size_t __mbsrtowcs_l (wchar_t *dst, const char **src, size_t len,
 			     mbstate_t *ps, __locale_t l) attribute_hidden;
+
+/* Special version.  We know that all uses of mbsinit inside the libc
+   have a non-NULL parameter.  And certainly we can access the
+   internals of the data structure directly.  */
+#  define mbsinit(state) ((state)->__count == 0)
+#  define __mbsinit(state) ((state)->__count == 0)
+
 # endif
 #endif