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diff --git a/gmp/mpf/out_str.c b/gmp/mpf/out_str.c
new file mode 100644
index 00000000..afccdbb0
--- /dev/null
+++ b/gmp/mpf/out_str.c
@@ -0,0 +1,105 @@
+/* mpf_out_str (stream, base, n_digits, op) -- Print N_DIGITS digits from
+   the float OP to STREAM in base BASE.  Return the number of characters
+   written, or 0 if an error occurred.
+
+Copyright 1996, 1997, 2001, 2002, 2005 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/.  */
+
+#define _GNU_SOURCE    /* for DECIMAL_POINT in langinfo.h */
+
+#include "config.h"
+
+#include <stdio.h>
+#include <string.h>
+
+#if HAVE_LANGINFO_H
+#include <langinfo.h>  /* for nl_langinfo */
+#endif
+
+#if HAVE_LOCALE_H
+#include <locale.h>    /* for localeconv */
+#endif
+
+#include "gmp.h"
+#include "gmp-impl.h"
+
+
+size_t
+mpf_out_str (FILE *stream, int base, size_t n_digits, mpf_srcptr op)
+{
+  char *str;
+  mp_exp_t exp;
+  size_t written;
+  TMP_DECL;
+
+  TMP_MARK;
+
+  if (base == 0)
+    base = 10;
+  if (n_digits == 0)
+    MPF_SIGNIFICANT_DIGITS (n_digits, base, op->_mp_prec);
+
+  if (stream == 0)
+    stream = stdout;
+
+  /* Consider these changes:
+     * Don't allocate memory here for huge n_digits; pass NULL to mpf_get_str.
+     * Make mpf_get_str allocate extra space when passed NULL, to avoid
+       allocating two huge string buffers.
+     * Implement more/other allocation reductions tricks.  */
+
+  str = (char *) TMP_ALLOC (n_digits + 2); /* extra for minus sign and \0 */
+
+  mpf_get_str (str, &exp, base, n_digits, op);
+  n_digits = strlen (str);
+
+  written = 0;
+
+  /* Write sign */
+  if (str[0] == '-')
+    {
+      str++;
+      fputc ('-', stream);
+      written = 1;
+      n_digits--;
+    }
+
+  {
+    const char  *point = GMP_DECIMAL_POINT;
+    size_t      pointlen = strlen (point);
+    putc ('0', stream);
+    fwrite (point, 1, pointlen, stream);
+    written += pointlen + 1;
+  }
+
+  /* Write mantissa */
+  {
+    size_t fwret;
+    fwret = fwrite (str, 1, n_digits, stream);
+    written += fwret;
+  }
+
+  /* Write exponent */
+  {
+    int fpret;
+    fpret = fprintf (stream, (base <= 10 ? "e%ld" : "@%ld"), exp);
+    written += fpret;
+  }
+
+  TMP_FREE;
+  return ferror (stream) ? 0 : written;
+}