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/*
Copyright (C) 2023 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 "gr_poly.h"
#include "gr_vec.h"
int
gr_poly_truncate(gr_poly_t poly, const gr_poly_t src, slong newlen, gr_ctx_t ctx)
{
if (src == poly)
{
if (poly->length > newlen)
{
_gr_poly_set_length(poly, newlen, ctx);
_gr_poly_normalise(poly, ctx);
}
return GR_SUCCESS;
}
else
{
int status = GR_SUCCESS;
slong len = src->length;
newlen = FLINT_MIN(newlen, src->length);
gr_poly_fit_length(poly, newlen, ctx);
status |= _gr_vec_set(poly->coeffs, src->coeffs, newlen, ctx);
_gr_poly_set_length(poly, newlen, ctx);
if (newlen < len)
_gr_poly_normalise(poly, ctx);
return status;
}
}