/* mpz_realloc2 -- change allocated data size.

Copyright 2001, 2002 Free Software Foundation, Inc.

This file is part of the GNU MP Library.

The GNU MP 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 3 of the License, or (at your
option) any later version.

The GNU MP 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 MP Library.  If not, see http://www.gnu.org/licenses/.  */

#include "gmp.h"
#include "gmp-impl.h"

void
mpz_realloc2 (mpz_ptr m, unsigned long bits)
{
  mp_ptr mp;
  mp_size_t new_alloc;

  new_alloc = (bits + GMP_NUMB_BITS-1) / GMP_NUMB_BITS;

  /* Never allocate zero space. */
  new_alloc = MAX (new_alloc, 1);

  mp = __GMP_REALLOCATE_FUNC_LIMBS (PTR(m), ALLOC(m), new_alloc);
  PTR(m) = mp;
  ALLOC(m) = new_alloc;

  /* Don't create an invalid number; if the current value doesn't fit after
     reallocation, clear it to 0.  */
  if (ABSIZ(m) > new_alloc)
    SIZ(m) = 0;
}