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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 "arb.h"
void
arb_trunc(arb_t res, const arb_t x, slong prec)
{
if (arb_contains_zero(x))
{
arb_t a;
arb_init(a);
mag_one(arb_radref(a));
if (arb_contains(a, x))
{
arb_zero(res);
}
else
{
arb_t b;
arb_init(b);
arb_floor(a, x, prec);
arb_ceil(b, x, prec);
arb_union(res, a, b, prec);
arb_clear(b);
}
arb_clear(a);
}
else if (arf_sgn(arb_midref(x)) > 0)
{
arb_floor(res, x, prec);
}
else
{
arb_ceil(res, x, prec);
}
}