Don't error out writing a multibyte character to an unbuffered stream (bug 17522)

libio/tst-fputws.c

@@ -0,0 +1,39 @@
+/* Test that we can write a multibyte character to an unbuffered stream.
+   Copyright (C) 2014 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <locale.h>
+#include <stdio.h>
+#include <wchar.h>
+
+static int
+do_test (void)
+{
+  const wchar_t str[] = L"\xbe\n";
+
+  setlocale (LC_ALL, "en_US.UTF-8");
+  setvbuf (stdout, NULL, _IONBF, 0);
+
+  if (fputws (str, stdout) < 0)
+    return 1;
+
+  return 0;
+}
+
+#define TEST_FUNCTION do_test ()
+
+#include <test-skeleton.c>