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diff --git a/libio/tst-wmemstream3.c b/libio/tst-wmemstream3.c
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+/* Test for open_memstream implementation.
+ Copyright (C) 2016-2018 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 <wchar.h>
+
+/* Straighforward implementation so tst-memstream3 could use check
+ fwrite on open_memstream. */
+static size_t
+fwwrite (const void *ptr, size_t size, size_t nmemb, FILE *arq)
+{
+ const wchar_t *wcs = (const wchar_t*) (ptr);
+ for (size_t s = 0; s < size; s++)
+ {
+ for (size_t n = 0; n < nmemb; n++)
+ if (fputwc (wcs[n], arq) == WEOF)
+ return n;
+ }
+ return size * nmemb;
+}
+
+#define CHAR_T wchar_t
+#define W(o) L##o
+#define OPEN_MEMSTREAM open_wmemstream
+#define PRINTF wprintf
+#define FWRITE_FUNC fwwrite
+#define FPUTC fputwc
+#define STRCMP wcscmp
+
+#include "tst-memstream3.c"