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diff --git a/src/grep/gnulib-tests/test-mbsinit.c b/src/grep/gnulib-tests/test-mbsinit.c
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+/* Test of test for initial conversion state.
+ Copyright (C) 2008-2021 Free Software Foundation, Inc.
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program 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 General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <https://www.gnu.org/licenses/>. */
+
+/* Written by Bruno Haible <bruno@clisp.org>, 2008. */
+
+#include <config.h>
+
+#include <wchar.h>
+
+#include "signature.h"
+SIGNATURE_CHECK (mbsinit, int, (const mbstate_t *));
+
+#include <locale.h>
+
+#include "macros.h"
+
+int
+main (int argc, char *argv[])
+{
+ static mbstate_t state;
+
+ ASSERT (mbsinit (NULL));
+
+ ASSERT (mbsinit (&state));
+
+ if (argc > 1)
+ {
+ static const char input[1] = "\303";
+ wchar_t wc;
+ size_t ret;
+
+ /* configure should already have checked that the locale is supported. */
+ if (setlocale (LC_ALL, "") == NULL)
+ return 1;
+
+ ret = mbrtowc (&wc, input, 1, &state);
+ ASSERT (ret == (size_t)(-2));
+ ASSERT (!mbsinit (&state));
+ }
+
+ return 0;
+}