1 files changed, 9 insertions, 5 deletions
diff --git a/stdlib/mbtowc.c b/stdlib/mbtowc.c
index 50e7c09834..938d54750c 100644
--- a/stdlib/mbtowc.c
+++ b/stdlib/mbtowc.c
@@ -18,6 +18,8 @@
 
 #include <stdlib.h>
 #include <wchar.h>
+#include <gconv.h>
+#include <wcsmbs/wcsmbsload.h>
 
 
 /* Common state for all non-restartable conversion functions.  */
@@ -38,12 +40,14 @@ mbtowc (wchar_t *pwc, const char *s, size_t n)
 
   /* If S is NULL the function has to return null or not null
      depending on the encoding having a state depending encoding or
-     not.  This is nonsense because any multibyte encoding has a
-     state.  The ISO C amendment 1 corrects this while introducing the
-     restartable functions.  We simply say here all encodings have a
-     state.  */
+     not.  */
   if (s == NULL)
-    result = 1;
+    {
+      /* Make sure we use the correct value.  */
+      update_conversion_ptrs ();
+
+      result = __wcsmbs_gconv_fcts.towc->stateful;
+    }
   else if (*s == '\0')
     {
       if (pwc != NULL)