/*
    Copyright (C) 2012-2014 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 "arb.h"

void
arb_sub(arb_t z, const arb_t x, const arb_t y, slong prec)
{
    int inexact;

    inexact = arf_sub(arb_midref(z), arb_midref(x), arb_midref(y), prec, ARB_RND);

    mag_add(arb_radref(z), arb_radref(x), arb_radref(y));
    if (inexact)
        arf_mag_add_ulp(arb_radref(z), arb_radref(z), arb_midref(z), prec);
}

void
arb_sub_arf(arb_t z, const arb_t x, const arf_t y, slong prec)
{
    int inexact;
    inexact = arf_sub(arb_midref(z), arb_midref(x), y, prec, ARB_RND);
    if (inexact)
        arf_mag_add_ulp(arb_radref(z), arb_radref(x), arb_midref(z), prec);
    else
        mag_set(arb_radref(z), arb_radref(x));
}

void
arb_sub_ui(arb_t z, const arb_t x, ulong y, slong prec)
{
    int inexact;
    inexact = arf_sub_ui(arb_midref(z), arb_midref(x), y, prec, ARB_RND);
    if (inexact)
        arf_mag_add_ulp(arb_radref(z), arb_radref(x), arb_midref(z), prec);
    else
        mag_set(arb_radref(z), arb_radref(x));
}

void
arb_sub_si(arb_t z, const arb_t x, slong y, slong prec)
{
    int inexact;
    inexact = arf_sub_si(arb_midref(z), arb_midref(x), y, prec, ARB_RND);
    if (inexact)
        arf_mag_add_ulp(arb_radref(z), arb_radref(x), arb_midref(z), prec);
    else
        mag_set(arb_radref(z), arb_radref(x));
}

void
arb_sub_fmpz(arb_t z, const arb_t x, const fmpz_t y, slong prec)
{
    int inexact;
    inexact = arf_sub_fmpz(arb_midref(z), arb_midref(x), y, prec, ARB_RND);
    if (inexact)
        arf_mag_add_ulp(arb_radref(z), arb_radref(x), arb_midref(z), prec);
    else
        mag_set(arb_radref(z), arb_radref(x));
}

