/*
    Copyright (C) 2014 Fredrik Johansson

    This file is part of Arb.

    Arb 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 <http://www.gnu.org/licenses/>.
*/

#include "arf.h"

int
arf_get_mpfr(mpfr_t x, const arf_t y, mpfr_rnd_t rnd)
{
    int r;

    if (arf_is_special(y))
    {
        if (arf_is_zero(y))
            mpfr_set_zero(x, 0);
        else if (arf_is_pos_inf(y))
            mpfr_set_inf(x, 1);
        else if (arf_is_neg_inf(y))
            mpfr_set_inf(x, -1);
        else
            mpfr_set_nan(x);
        r = 0;
    }
    else if (COEFF_IS_MPZ(*ARF_EXPREF(y)))
    {
        flint_printf("exception: exponent too large to convert to mpfr");
        flint_abort();
        r = 0; /* dummy return because flint_abort() is not declared noreturn */
    }
    else
    {
        __mpfr_struct t;
        mp_size_t n;
        mp_srcptr d;

        ARF_GET_MPN_READONLY(d, n, y);

        t._mpfr_d = (mp_ptr) d;
        t._mpfr_exp = ARF_EXP(y);
        t._mpfr_prec = n * FLINT_BITS;
        t._mpfr_sign = ARF_SGNBIT(y) ? -1 : 1;

        r = mpfr_set(x, &t, rnd);
    }

    return r;
}