1/* _mpz_realloc -- make the mpz_t have NEW_ALLOC digits allocated.
2
3Copyright 1991, 1993, 1994, 1995, 2000, 2001, 2008 Free Software Foundation,
4Inc.
5
6This file is part of the GNU MP Library.
7
8The GNU MP Library is free software; you can redistribute it and/or modify
9it under the terms of the GNU Lesser General Public License as published by
10the Free Software Foundation; either version 3 of the License, or (at your
11option) any later version.
12
13The GNU MP Library is distributed in the hope that it will be useful, but
14WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
15or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
16License for more details.
17
18You should have received a copy of the GNU Lesser General Public License
19along with the GNU MP Library.  If not, see http://www.gnu.org/licenses/.  */
20
21#include <stdlib.h>
22#include <stdio.h>
23#include "gmp.h"
24#include "gmp-impl.h"
25
26void *
27_mpz_realloc (mpz_ptr m, mp_size_t new_alloc)
28{
29  mp_ptr mp;
30
31  /* Never allocate zero space. */
32  new_alloc = MAX (new_alloc, 1);
33
34  if (sizeof (mp_size_t) == sizeof (int))
35    {
36      if (UNLIKELY (new_alloc > ULONG_MAX / GMP_NUMB_BITS))
37	{
38	  fprintf (stderr, "gmp: overflow in mpz type\n");
39	  abort ();
40	}
41    }
42  else
43    {
44      if (UNLIKELY (new_alloc > INT_MAX))
45	{
46	  fprintf (stderr, "gmp: overflow in mpz type\n");
47	  abort ();
48	}
49    }
50
51  mp = __GMP_REALLOCATE_FUNC_LIMBS (PTR(m), ALLOC(m), new_alloc);
52  PTR(m) = mp;
53  ALLOC(m) = new_alloc;
54
55  /* Don't create an invalid number; if the current value doesn't fit after
56     reallocation, clear it to 0.  */
57  if (ABSIZ(m) > new_alloc)
58    SIZ(m) = 0;
59
60  return (void *) mp;
61}
62