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/*
Copyright (C) 2007, David Howden.
Copyright (C) 2010 William Hart
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 "mpn_extras.h"
#include "nmod.h"
#include "nmod_poly.h"
void nmod_poly_set_coeff_ui(nmod_poly_t poly, slong j, ulong c)
{
if (c >= poly->mod.n)
NMOD_RED(c, c, poly->mod);
nmod_poly_fit_length(poly, j + 1);
if (j + 1 < poly->length) /* interior */
poly->coeffs[j] = c;
else if (j + 1 == poly->length) /* leading coeff */
{
if (c != 0)
poly->coeffs[j] = c;
else
{
poly->length--;
_nmod_poly_normalise(poly);
}
} else /* extend polynomial */
{
if (c == 0) return;
else
{
flint_mpn_zero(poly->coeffs + poly->length, j - poly->length);
poly->coeffs[j] = c;
poly->length = j + 1;
}
}
}