/*
    Copyright (C) 2008, 2009 William Hart
    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 2.1 of the License, or
    (at your option) any later version.  See <https://www.gnu.org/licenses/>.
*/

#include <gmp.h>
#include "flint.h"
#include "fmpz.h"
#include "fmpz_vec.h"
#include "fmpz_poly.h"

void
fmpz_poly_scalar_submul_fmpz(fmpz_poly_t poly1, const fmpz_poly_t poly2,
                             const fmpz_t x)
{
    if (!fmpz_is_zero(x) && !fmpz_poly_is_zero(poly2))
    {
        fmpz_poly_fit_length(poly1, poly2->length);
        if (poly2->length > poly1->length)
	    _fmpz_vec_zero(poly1->coeffs + poly1->length,
	                   poly2->length - poly1->length);
	_fmpz_vec_scalar_submul_fmpz(poly1->coeffs, 
                                     poly2->coeffs, poly2->length, x);
        _fmpz_poly_set_length(poly1, FLINT_MAX(poly1->length, poly2->length));
        _fmpz_poly_normalise(poly1);
    }
}