/*
    Copyright (C) 2010 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"

void
_fmpz_vec_scalar_submul_fmpz(fmpz * vec1, const fmpz * vec2, slong len2,
                             const fmpz_t x)
{
    fmpz c = *x;

    if (!COEFF_IS_MPZ(c))
    {
        if (c == 0)
            return;
        else if (c == 1)
            _fmpz_vec_sub(vec1, vec1, vec2, len2);
        else if (c == -1)
            _fmpz_vec_add(vec1, vec1, vec2, len2);
        else
            _fmpz_vec_scalar_submul_si(vec1, vec2, len2, c);
    }
    else
    {
        slong i;
        for (i = 0; i < len2; i++)
            fmpz_submul(vec1 + i, vec2 + i, x);
    }
}