From ec1bb5b3d2ee3e50dd2956595dd7cf8b82de64ff Mon Sep 17 00:00:00 2001
From: Kaz Kylheku <kaz@kylheku.com>
Date: Wed, 22 Apr 2015 19:54:38 -0700
Subject: mpi-set-double-intptr patch

* mpi/mpi.c (mp_set_double_intptr): New function.

* mpi/mpi.h (mp_set_double_intptr): Declared.
---
 mpi/mpi.c | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

(limited to 'mpi/mpi.c')

diff --git a/mpi/mpi.c b/mpi/mpi.c
index 93a97331..7a721e3b 100644
--- a/mpi/mpi.c
+++ b/mpi/mpi.c
@@ -571,6 +571,36 @@ mp_err mp_get_intptr(mp_int *mp, int_ptr_t *z)
   return MP_OKAY;
 }
 
+#ifdef HAVE_DOUBLE_INTPTR_T
+mp_err mp_set_double_intptr(mp_int *mp, double_intptr_t z)
+{
+  int            ix, shift;
+  double_intptr_t v = z > 0 ? z : -z;
+  const int      nd = (sizeof v + sizeof (mp_digit) - 1) / sizeof (mp_digit);
+
+  ARGCHK(mp != NULL, MP_BADARG);
+
+  mp_zero(mp);
+
+  if(z == 0)
+    return MP_OKAY;  /* shortcut for zero */
+
+  s_mp_grow(mp, nd);
+
+  USED(mp) = nd;
+
+  for (ix = 0, shift = 0; ix < nd; ix++, shift += MP_DIGIT_BIT)
+  {
+    DIGIT(mp, ix) = (v >> shift) & MP_DIGIT_MAX;
+  }
+
+  if(z < 0)
+    SIGN(mp) = MP_NEG;
+
+  return MP_OKAY;
+}
+#endif
+
 mp_err mp_set_word(mp_int *mp, mp_word w, int sign)
 {
   USED(mp) = 2;
-- 
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