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-rw-r--r--libio/tst-wfile-sync.c39
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diff --git a/libio/tst-wfile-sync.c b/libio/tst-wfile-sync.c
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+/* Test that _IO_wfile_sync does not crash (bug 20568).
+ Copyright (C) 2019 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>
+#include <support/check.h>
+#include <support/xunistd.h>
+
+static int
+do_test (void)
+{
+ TEST_VERIFY_EXIT (setlocale (LC_ALL, "de_DE.UTF-8") != NULL);
+ /* Fill the stdio buffer and advance the read pointer. */
+ TEST_VERIFY_EXIT (fgetwc (stdin) != WEOF);
+ /* This calls _IO_wfile_sync, it should not crash. */
+ TEST_VERIFY_EXIT (setvbuf (stdin, NULL, _IONBF, 0) == 0);
+ /* Verify that the external file offset has been synchronized. */
+ TEST_COMPARE (xlseek (0, 0, SEEK_CUR), 1);
+
+ return 0;
+}
+
+#include <support/test-driver.c>