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diff --git a/gmp/cxx/osfuns.cc b/gmp/cxx/osfuns.cc
new file mode 100644
index 00000000..d4a24432
--- /dev/null
+++ b/gmp/cxx/osfuns.cc
@@ -0,0 +1,113 @@
+/* Support for operator<< routines.
+
+   THE FUNCTIONS IN THIS FILE ARE FOR INTERNAL USE ONLY.  THEY'RE ALMOST
+   CERTAIN TO BE SUBJECT TO INCOMPATIBLE CHANGES OR DISAPPEAR COMPLETELY IN
+   FUTURE GNU MP RELEASES.
+
+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 <iostream>
+#include <stdarg.h>    /* for va_list and hence doprnt_funs_t */
+#include <string.h>
+
+#include "gmp.h"
+#include "gmp-impl.h"
+
+using namespace std;
+
+
+/* Don't need "format" for operator<< routines, just "memory" and "reps".
+   Omitting gmp_asprintf_format lets us avoid dragging vsnprintf into the
+   link.  __gmp_asprintf_final will be called directly and doesn't need to
+   be in the struct.  */
+
+const struct doprnt_funs_t  __gmp_asprintf_funs_noformat = {
+  NULL,
+  (doprnt_memory_t) __gmp_asprintf_memory,
+  (doprnt_reps_t)   __gmp_asprintf_reps,
+  NULL
+};
+
+
+void
+__gmp_doprnt_params_from_ios (struct doprnt_params_t *p, ios &o)
+{
+  if ((o.flags() & ios::basefield) == ios::hex)
+    {
+      p->expfmt = "@%c%02d";
+      p->base = (o.flags() & ios::uppercase ? -16 : 16);
+    }
+  else
+    {
+      p->expfmt = (o.flags() & ios::uppercase ? "E%c%02d" : "e%c%02d");
+      if ((o.flags() & ios::basefield) == ios::oct)
+        p->base = 8;
+      else
+        p->base = 10;
+    }
+
+  /* "general" if none or more than one bit set */
+  if ((o.flags() & ios::floatfield) == ios::fixed)
+    p->conv = DOPRNT_CONV_FIXED;
+  else if ((o.flags() & ios::floatfield) == ios::scientific)
+    p->conv = DOPRNT_CONV_SCIENTIFIC;
+  else
+    p->conv = DOPRNT_CONV_GENERAL;
+
+  p->exptimes4 = 0;
+
+  p->fill = o.fill();
+
+  /* "right" if more than one bit set */
+  if ((o.flags() & ios::adjustfield) == ios::left)
+    p->justify = DOPRNT_JUSTIFY_LEFT;
+  else if ((o.flags() & ios::adjustfield) == ios::internal)
+    p->justify = DOPRNT_JUSTIFY_INTERNAL;
+  else
+    p->justify = DOPRNT_JUSTIFY_RIGHT;
+
+  /* ios::fixed allows prec==0, others take 0 as the default 6.
+     Don't allow negatives (they do bad things to __gmp_doprnt_float_cxx).  */
+  p->prec = MAX (0, o.precision());
+  if (p->prec == 0 && p->conv != DOPRNT_CONV_FIXED)
+    p->prec = 6;
+
+  /* for hex showbase is always, for octal only non-zero */
+  if (o.flags() & ios::showbase)
+    p->showbase = ((o.flags() & ios::basefield) == ios::hex
+                   ? DOPRNT_SHOWBASE_YES : DOPRNT_SHOWBASE_NONZERO);
+  else
+    p->showbase = DOPRNT_SHOWBASE_NO;
+
+  p->showpoint = ((o.flags() & ios::showpoint) != 0);
+
+  /* in fixed and scientific always show trailing zeros, in general format
+     show them if showpoint is set (or so it seems) */
+  if ((o.flags() & ios::floatfield) == ios::fixed
+      || (o.flags() & ios::floatfield) == ios::scientific)
+    p->showtrailing = 1;
+  else
+    p->showtrailing = p->showpoint;
+
+  p->sign = (o.flags() & ios::showpos ? '+' : '\0');
+
+  p->width = o.width();
+
+  /* reset on each output */
+  o.width (0);
+}