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/*
Copyright (C) 2010 Sebastian Pancratz
This file is part of FLINT.
FLINT is free software: you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License (LGPL) as published
by the Free Software Foundation; either version 3 of the License, or
(at your option) any later version. See <https://www.gnu.org/licenses/>.
*/
#include "fmpz.h"
#include "fmpz_poly.h"
#include "fmpq_poly.h"
int _fmpq_poly_is_canonical(const fmpz * poly, const fmpz_t den, slong len)
{
if (len)
{
int ans;
fmpz_t c;
if (fmpz_is_zero(poly + len - 1))
return 0;
if (fmpz_sgn(den) < 0)
return 0;
fmpz_init(c);
_fmpz_poly_content(c, poly, len);
fmpz_gcd(c, c, den);
ans = (*c == WORD(1));
fmpz_clear(c);
return ans;
}
else
{
return (*den == WORD(1));
}
}
int fmpq_poly_is_canonical(const fmpq_poly_t poly)
{
return _fmpq_poly_is_canonical(poly->coeffs, poly->den, poly->length);
}