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diff --git a/gmp/printf/vsnprintf.c b/gmp/printf/vsnprintf.c
new file mode 100644
index 00000000..565fdfd8
--- /dev/null
+++ b/gmp/printf/vsnprintf.c
@@ -0,0 +1,44 @@
+/* gmp_vsnprintf -- formatted output to an fixed size buffer.
+
+Copyright 2001 Free Software Foundation, Inc.
+
+This file is part of the GNU MP Library.
+
+The GNU MP 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 3 of the License, or (at your
+option) any later version.
+
+The GNU MP 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 MP Library.  If not, see http://www.gnu.org/licenses/.  */
+
+#include "config.h"
+
+#if HAVE_STDARG
+#include <stdarg.h>
+#else
+#include <varargs.h>
+#endif
+
+#include <string.h>    /* for strlen */
+
+#include "gmp.h"
+#include "gmp-impl.h"
+
+
+int
+gmp_vsnprintf (char *buf, size_t size, const char *fmt, va_list ap)
+{
+  struct gmp_snprintf_t d;
+
+  ASSERT (! MEM_OVERLAP_P (buf, size, fmt, strlen(fmt)+1));
+
+  d.buf = buf;
+  d.size = size;
+  return __gmp_doprnt (&__gmp_snprintf_funs, &d, fmt, ap);
+}