1/* mpq_neg -- negate a rational.
2
3Copyright 2000, 2001 Free Software Foundation, Inc.
4
5This file is part of the GNU MP Library.
6
7The GNU MP Library is free software; you can redistribute it and/or modify
8it under the terms of the GNU Lesser General Public License as published by
9the Free Software Foundation; either version 3 of the License, or (at your
10option) any later version.
11
12The GNU MP Library is distributed in the hope that it will be useful, but
13WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
15License for more details.
16
17You should have received a copy of the GNU Lesser General Public License
18along with the GNU MP Library.  If not, see http://www.gnu.org/licenses/.  */
19
20#define __GMP_FORCE_mpq_neg 1
21
22#include "gmp.h"
23#include "gmp-impl.h"
24
25
26void
27mpq_neg (mpq_ptr dst, mpq_srcptr src)
28{
29  mp_size_t  num_size = src->_mp_num._mp_size;
30
31  if (src != dst)
32    {
33      mp_size_t  num_abs_size = ABS(num_size);
34      mp_size_t  den_size = src->_mp_den._mp_size;
35
36      MPZ_REALLOC (mpq_numref(dst), num_abs_size);
37      MPZ_REALLOC (mpq_denref(dst), den_size);
38
39      MPN_COPY (dst->_mp_num._mp_d, src->_mp_num._mp_d, num_abs_size);
40      MPN_COPY (dst->_mp_den._mp_d, src->_mp_den._mp_d, den_size);
41
42      dst->_mp_den._mp_size = den_size;
43    }
44
45  dst->_mp_num._mp_size = -num_size;
46}
47