pqc/external/flint-2.4.3/fmpq_poly/reverse.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 Sebastian Pancratz
******************************************************************************/
#include <gmp.h>
#include "flint.h"
#include "fmpz.h"
#include "fmpz_vec.h"
#include "fmpq_poly.h"
void fmpq_poly_reverse(fmpq_poly_t res, const fmpq_poly_t poly, slong n)
{
slong len = FLINT_MIN(n, poly->length);
if (len == 0)
{
fmpq_poly_zero(res);
return;
}
fmpq_poly_fit_length(res, n);
_fmpz_poly_reverse(res->coeffs, poly->coeffs, len, n);
fmpz_set(res->den, poly->den);
_fmpq_poly_set_length(res, n);
fmpq_poly_canonicalise(res);
}