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diff --git a/tests/unistdio/test-u8-vasnprintf1.c b/tests/unistdio/test-u8-vasnprintf1.c
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+/* Test of u8_vasnprintf() function.
+ Copyright (C) 2007-2008 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 <http://www.gnu.org/licenses/>. */
+
+/* Written by Bruno Haible <bruno@clisp.org>, 2007. */
+
+#include <config.h>
+
+#include "unistdio.h"
+
+#include <errno.h>
+#include <stdarg.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "unistr.h"
+
+#define SIZEOF(array) (sizeof (array) / sizeof (array[0]))
+#define ASSERT(expr) \
+ do \
+ { \
+ if (!(expr)) \
+ { \
+ fprintf (stderr, "%s:%d: assertion failed\n", __FILE__, __LINE__); \
+ fflush (stderr); \
+ abort (); \
+ } \
+ } \
+ while (0)
+
+#include "test-u8-asnprintf1.h"
+#include "test-u8-printf1.h"
+
+static uint8_t *
+my_asnprintf (uint8_t *resultbuf, size_t *lengthp, const char *format, ...)
+{
+ va_list args;
+ uint8_t *ret;
+
+ va_start (args, format);
+ ret = u8_vasnprintf (resultbuf, lengthp, format, args);
+ va_end (args);
+ return ret;
+}
+
+static uint8_t *
+my_xasprintf (const char *format, ...)
+{
+ va_list args;
+ size_t length;
+ uint8_t *ret;
+
+ va_start (args, format);
+ ret = u8_vasnprintf (NULL, &length, format, args);
+ va_end (args);
+ if (ret != NULL)
+ ASSERT (length == u8_strlen (ret));
+ return ret;
+}
+
+static void
+test_vasnprintf ()
+{
+ test_function (my_asnprintf);
+ test_xfunction (my_xasprintf);
+}
+
+int
+main (int argc, char *argv[])
+{
+ test_vasnprintf ();
+ return 0;
+}