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diff --git a/newlib/libc/stdio/vswprintf.c b/newlib/libc/stdio/vswprintf.c
new file mode 100644
index 0000000000..2d9096c15f
--- /dev/null
+++ b/newlib/libc/stdio/vswprintf.c
@@ -0,0 +1,82 @@
+/*
+ * Copyright (c) 1990 The Regents of the University of California.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that the above copyright notice and this paragraph are
+ * duplicated in all such forms and that any documentation,
+ * advertising materials, and other materials related to such
+ * distribution and use acknowledge that the software was developed
+ * by the University of California, Berkeley.  The name of the
+ * University may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ */
+/* doc in vfwprintf.c */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+static char sccsid[] = "%W% (Berkeley) %G%";
+#endif /* LIBC_SCCS and not lint */
+
+#include <_ansi.h>
+#include <reent.h>
+#include <stdio.h>
+#include <wchar.h>
+#include <limits.h>
+#include <stdarg.h>
+#include <errno.h>
+
+#include "local.h"
+
+int
+_DEFUN(_vswprintf_r, (ptr, str, size, fmt, ap),
+       struct _reent *ptr _AND
+       wchar_t *str          _AND
+       size_t size        _AND
+       const wchar_t *fmt   _AND
+       va_list ap)
+{
+  int ret;
+  FILE f;
+
+  if (size > INT_MAX / sizeof (wchar_t))
+    {
+      ptr->_errno = EOVERFLOW;	/* POSIX extension */
+      return EOF;
+    }
+  f._flags = __SWR | __SSTR;
+  f._bf._base = f._p = (unsigned char *) str;
+  f._bf._size = f._w = (size > 0 ? (size - 1) * sizeof (wchar_t) : 0);
+  f._file = -1;  /* No file. */
+  ret = _svfwprintf_r (ptr, &f, fmt, ap);
+  /* _svfwprintf_r() does not put in a terminating NUL, so add one if
+   * appropriate, which is whenever size is > 0.  _svfwprintf_r() stops
+   * after n-1, so always just put at the end.  */
+  if (size > 0)  {
+    *(wchar_t *)f._p = L'\0';	/* terminate the string */
+  }
+  if(ret >= size)  {
+    /* _svfwprintf_r() returns how many wide characters it would have printed
+     * if there were enough space.  Return an error if too big to fit in str,
+     * unlike snprintf, which returns the size needed.  */
+    ptr->_errno = EOVERFLOW;	/* POSIX extension */
+    ret = -1;
+  }
+  return ret;
+}
+
+#ifndef _REENT_ONLY
+
+int
+_DEFUN(vswprintf, (str, size, fmt, ap),
+       wchar_t *str        _AND
+       size_t size      _AND
+       const wchar_t *fmt _AND
+       va_list ap)
+{
+  return _vswprintf_r (_REENT, str, size, fmt, ap);
+}
+
+#endif /* !_REENT_ONLY */