xref: /dflybsd-src/contrib/gmp/mpq/set_si.c (revision d365564473a20a528d07c59cad8ee2f4bea5546f)

/* mpq_set_si(dest,ulong_num,ulong_den) -- Set DEST to the rational number
   ULONG_NUM/ULONG_DEN.

Copyright 1991, 1994, 1995, 2001, 2003 Free Software Foundation, Inc.

This file is part of the GNU MP Library.

The GNU MP Library is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 3 of the License, or (at your
option) any later version.

The GNU MP Library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
License for more details.

You should have received a copy of the GNU Lesser General Public License
along with the GNU MP Library.  If not, see http://www.gnu.org/licenses/.  */

#include "gmp.h"
#include "gmp-impl.h"

void
mpq_set_si (MP_RAT *dest, signed long int num, unsigned long int den)
{
  unsigned long int abs_num;

  if (GMP_NUMB_BITS < BITS_PER_ULONG)
    {
      if (num == 0)  /* Canonicalize 0/d to 0/1.  */
        den = 1;
      mpz_set_si (mpq_numref (dest), num);
      mpz_set_ui (mpq_denref (dest), den);
      return;
    }

  abs_num = ABS_CAST (unsigned long, num);

  if (num == 0)
    {
      /* Canonicalize 0/d to 0/1.  */
      den = 1;
      dest->_mp_num._mp_size = 0;
    }
  else
    {
      dest->_mp_num._mp_d[0] = abs_num;
      dest->_mp_num._mp_size = num > 0 ? 1 : -1;
    }

  dest->_mp_den._mp_d[0] = den;
  dest->_mp_den._mp_size = (den != 0);
}