1/* mpz_fdiv_r -- Division rounding the quotient towards -infinity.
2   The remainder gets the same sign as the denominator.
3
4Copyright 1994-1996, 2001, 2005, 2012 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 either:
10
11  * the GNU Lesser General Public License as published by the Free
12    Software Foundation; either version 3 of the License, or (at your
13    option) any later version.
14
15or
16
17  * the GNU General Public License as published by the Free Software
18    Foundation; either version 2 of the License, or (at your option) any
19    later version.
20
21or both in parallel, as here.
22
23The GNU MP Library is distributed in the hope that it will be useful, but
24WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
25or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
26for more details.
27
28You should have received copies of the GNU General Public License and the
29GNU Lesser General Public License along with the GNU MP Library.  If not,
30see https://www.gnu.org/licenses/.  */
31
32#include "gmp-impl.h"
33
34void
35mpz_fdiv_r (mpz_ptr rem, mpz_srcptr dividend, mpz_srcptr divisor)
36{
37  mp_size_t divisor_size = SIZ (divisor);
38  mpz_t temp_divisor;		/* N.B.: lives until function returns! */
39  TMP_DECL;
40
41  TMP_MARK;
42
43  /* We need the original value of the divisor after the remainder has been
44     preliminary calculated.  We have to copy it to temporary space if it's
45     the same variable as REM.  */
46  if (rem == divisor)
47    {
48      MPZ_TMP_INIT (temp_divisor, ABS (divisor_size));
49      mpz_set (temp_divisor, divisor);
50      divisor = temp_divisor;
51    }
52
53  mpz_tdiv_r (rem, dividend, divisor);
54
55  if ((divisor_size ^ SIZ (dividend)) < 0 && SIZ (rem) != 0)
56    mpz_add (rem, rem, divisor);
57
58  TMP_FREE;
59}
60