2 files changed, 12 insertions, 0 deletions
diff --git a/newlib/libc/stdlib/mbtowc_r.c b/newlib/libc/stdlib/mbtowc_r.c
index 863404fcb..f161385ed 100644
--- a/newlib/libc/stdlib/mbtowc_r.c
+++ b/newlib/libc/stdlib/mbtowc_r.c
@@ -47,6 +47,14 @@ _DEFUN (__ascii_mbtowc, (r, pwc, s, n, charset, state),
   if (n == 0)
     return -2;
 
+#ifdef __CYGWIN__
+  if ((wchar_t)*t >= 0x80)
+    {
+      r->_errno = EILSEQ;
+      return -1;
+    }
+#endif
+
   *pwc = (wchar_t)*t;
   
   if (*t == '\0')
diff --git a/newlib/libc/stdlib/wctomb_r.c b/newlib/libc/stdlib/wctomb_r.c
index 2c462ba63..d1ee4978d 100644
--- a/newlib/libc/stdlib/wctomb_r.c
+++ b/newlib/libc/stdlib/wctomb_r.c
@@ -40,7 +40,11 @@ _DEFUN (__ascii_wctomb, (r, s, wchar, charset, state),
   if (s == NULL)
     return 0;
  
+#ifdef __CYGWIN__
+  if ((size_t)wchar >= 0x80)
+#else
   if ((size_t)wchar >= 0x100)
+#endif
     {
       r->_errno = EILSEQ;
       return -1;