1/* mpz_cdiv_qr -- Division rounding the quotient towards +infinity.  The
2   remainder gets the opposite sign as the denominator.
3
4Copyright 1994, 1995, 1996, 2000, 2001, 2005 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
25mpz_cdiv_qr (mpz_ptr quot, mpz_ptr rem, mpz_srcptr dividend, mpz_srcptr divisor)
26{
27  mp_size_t divisor_size = divisor->_mp_size;
28  mp_size_t xsize;
29  mpz_t temp_divisor;		/* N.B.: lives until function returns! */
30  TMP_DECL;
31
32  TMP_MARK;
33
34  /* We need the original value of the divisor after the quotient and
35     remainder have been preliminary calculated.  We have to copy it to
36     temporary space if it's the same variable as either QUOT or REM.  */
37  if (quot == divisor || rem == divisor)
38    {
39      MPZ_TMP_INIT (temp_divisor, ABS (divisor_size));
40      mpz_set (temp_divisor, divisor);
41      divisor = temp_divisor;
42    }
43
44  xsize = dividend->_mp_size ^ divisor_size;;
45  mpz_tdiv_qr (quot, rem, dividend, divisor);
46
47  if (xsize >= 0 && rem->_mp_size != 0)
48    {
49      mpz_add_ui (quot, quot, 1L);
50      mpz_sub (rem, rem, divisor);
51    }
52
53  TMP_FREE;
54}
55