/* mpfr_stack -- initialize a floating-point number with given allocation area

Copyright 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
Contributed by the Arenaire and Cacao projects, INRIA.

This file is part of the GNU MPFR Library.

The GNU MPFR Library is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or (at your
option) any later version.

The GNU MPFR Library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
License for more details.

You should have received a copy of the GNU Lesser General Public License
along with the GNU MPFR Library; see the file COPYING.LIB.  If not, write to
the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
MA 02110-1301, USA. */

#include "mpfr-impl.h"

#undef mpfr_custom_get_size
size_t
mpfr_custom_get_size (mp_prec_t prec)
{
  return (prec + BITS_PER_MP_LIMB -1) / BITS_PER_MP_LIMB * BYTES_PER_MP_LIMB;
}

#undef mpfr_custom_init
void
mpfr_custom_init (void *mantissa, mp_prec_t prec)
{
  return ;
}

#undef mpfr_custom_get_mantissa
void *
mpfr_custom_get_mantissa (mpfr_srcptr x)
{
  return (void*) MPFR_MANT (x);
}

#undef mpfr_custom_get_exp
mp_exp_t
mpfr_custom_get_exp (mpfr_srcptr x)
{
  return MPFR_EXP (x);
}

#undef mpfr_custom_move
void
mpfr_custom_move (mpfr_ptr x, void *new_position)
{
  MPFR_MANT (x) = (mp_limb_t *) new_position;
}

#undef mpfr_custom_init_set
void
mpfr_custom_init_set (mpfr_ptr x, int kind, mp_exp_t exp,
                     mp_prec_t prec, void *mantissa)
{
  mpfr_kind_t t;
  int s;
  mp_exp_t e;

  if (kind >= 0)
    {
      t = (mpfr_kind_t) kind;
      s = MPFR_SIGN_POS;
    }
  else
    {
      t = (mpfr_kind_t) -kind;
      s = MPFR_SIGN_NEG;
    }
  MPFR_ASSERTD (t <= MPFR_REGULAR_KIND);
  e = MPFR_LIKELY (t == MPFR_REGULAR_KIND) ? exp :
    MPFR_UNLIKELY (t == MPFR_NAN_KIND) ? MPFR_EXP_NAN :
    MPFR_UNLIKELY (t == MPFR_INF_KIND) ? MPFR_EXP_INF : MPFR_EXP_ZERO;

  MPFR_PREC (x) = prec;
  MPFR_SET_SIGN (x, s);
  MPFR_EXP (x) = e;
  MPFR_MANT (x) = (mp_limb_t*) mantissa;
  return;
}

#undef mpfr_custom_get_kind
int
mpfr_custom_get_kind (mpfr_srcptr x)
{
  if (MPFR_LIKELY (!MPFR_IS_SINGULAR (x)))
    return (int) MPFR_REGULAR_KIND * MPFR_INT_SIGN (x);
  if (MPFR_IS_INF (x))
    return (int) MPFR_INF_KIND * MPFR_INT_SIGN (x);
  if (MPFR_IS_NAN (x))
    return (int) MPFR_NAN_KIND;
  MPFR_ASSERTD (MPFR_IS_ZERO (x));
  return (int) MPFR_ZERO_KIND * MPFR_INT_SIGN (x);
}