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/*
Copyright (C) 2014 Fredrik Johansson
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 "nmod_vec.h"
#include "nmod_poly.h"
void
nmod_poly_set_trunc(nmod_poly_t res, const nmod_poly_t poly, slong len)
{
if (poly == res)
{
if (res->length > len)
{
res->length = len;
_nmod_poly_normalise(res);
}
}
else
{
slong rlen;
rlen = FLINT_MIN(len, poly->length);
while (rlen > 0 && poly->coeffs[rlen - 1] == 0)
rlen--;
nmod_poly_fit_length(res, rlen);
_nmod_vec_set(res->coeffs, poly->coeffs, rlen);
_nmod_poly_set_length(res, rlen);
}
}