pqc/external/flint-2.4.3/fmpq/is_canonical.c

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2014-05-18 22:03:37 +00:00
/*=============================================================================
This file is part of FLINT.
FLINT is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
FLINT 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with FLINT; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
=============================================================================*/
/******************************************************************************
Copyright (C) 2011 Fredrik Johansson
******************************************************************************/
#include "fmpq.h"
int _fmpq_is_canonical(const fmpz_t num, const fmpz_t den)
{
fmpz_t u;
int result;
if (fmpz_is_one(den)) return 1;
if (fmpz_sgn(den) <= 0) return 0;
if (fmpz_is_zero(num)) return fmpz_is_one(den);
fmpz_init(u);
fmpz_gcd(u, num, den);
result = fmpz_is_one(u);
fmpz_clear(u);
return result;
}
int fmpq_is_canonical(const fmpq_t x)
{
return _fmpq_is_canonical(fmpq_numref(x), fmpq_denref(x));
}