1/* mpq_set_si(dest,ulong_num,ulong_den) -- Set DEST to the rational number
2   ULONG_NUM/ULONG_DEN.
3
4Copyright 1991, 1994, 1995, 2001, 2003 Free Software Foundation, Inc.
5
6This file is part of the GNU MP Library.
7
8The GNU MP Library is free software; you can redistribute it and/or modify
9it under the terms of the GNU Lesser General Public License as published by
10the Free Software Foundation; either version 3 of the License, or (at your
11option) any later version.
12
13The GNU MP Library is distributed in the hope that it will be useful, but
14WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
15or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
16License for more details.
17
18You should have received a copy of the GNU Lesser General Public License
19along with the GNU MP Library.  If not, see http://www.gnu.org/licenses/.  */
20
21#include "gmp.h"
22#include "gmp-impl.h"
23
24void
25mpq_set_si (MP_RAT *dest, signed long int num, unsigned long int den)
26{
27  unsigned long int abs_num;
28
29  if (GMP_NUMB_BITS < BITS_PER_ULONG)
30    {
31      if (num == 0)  /* Canonicalize 0/d to 0/1.  */
32        den = 1;
33      mpz_set_si (mpq_numref (dest), num);
34      mpz_set_ui (mpq_denref (dest), den);
35      return;
36    }
37
38  abs_num = ABS_CAST (unsigned long, num);
39
40  if (num == 0)
41    {
42      /* Canonicalize 0/d to 0/1.  */
43      den = 1;
44      dest->_mp_num._mp_size = 0;
45    }
46  else
47    {
48      dest->_mp_num._mp_d[0] = abs_num;
49      dest->_mp_num._mp_size = num > 0 ? 1 : -1;
50    }
51
52  dest->_mp_den._mp_d[0] = den;
53  dest->_mp_den._mp_size = (den != 0);
54}
55