/* Memory allocation routines.

Copyright 1991, 1993, 1994, 2000-2002, 2012 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 either:

  * 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.

or

  * the GNU General Public License as published by the Free Software

    Foundation; either version 2 of the License, or (at your option) any

    later version.

or both in parallel, as here.

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 General Public License

for more details.

You should have received copies of the GNU General Public License and the

GNU Lesser General Public License along with the GNU MP Library.  If not,

see https://www.gnu.org/licenses/.  */

#include <stdio.h>

#include <stdlib.h> /* for malloc, realloc, free */

#include "gmp.h"

#include "gmp-impl.h"

void * (*__gmp_allocate_func) (size_t) = __gmp_default_allocate;

void * (*__gmp_reallocate_func) (void *, size_t, size_t) = __gmp_default_reallocate;

void   (*__gmp_free_func) (void *, size_t) = __gmp_default_free;

/* Default allocation functions.  In case of failure to allocate/reallocate

   an error message is written to stderr and the program aborts.  */

void *

__gmp_default_allocate (size_t size)

{

  void *ret;

#ifdef DEBUG

  size_t req_size = size;

  size += 2 * GMP_LIMB_BYTES;

#endif

  ret = malloc (size);

  if (ret == 0)

    {

      fprintf (stderr, "GNU MP: Cannot allocate memory (size=%lu)\n", (long) size);

      abort ();

    }

#ifdef DEBUG

  {

    mp_ptr p = ret;

    p++;

    p[-1] = (0xdeadbeef << 31) + 0xdeafdeed;

    if (req_size % GMP_LIMB_BYTES == 0)

      p[req_size / GMP_LIMB_BYTES] = ~((0xdeadbeef << 31) + 0xdeafdeed);

    ret = p;

  }

#endif

  return ret;

}

void *

__gmp_default_reallocate (void *oldptr, size_t old_size, size_t new_size)

{

  void *ret;

#ifdef DEBUG

  size_t req_size = new_size;

  if (old_size != 0)

    {

      mp_ptr p = oldptr;

      if (p[-1] != (0xdeadbeef << 31) + 0xdeafdeed)

	{

	  fprintf (stderr, "gmp: (realloc) data clobbered before allocation block\n");

	  abort ();

	}

      if (old_size % GMP_LIMB_BYTES == 0)

	if (p[old_size / GMP_LIMB_BYTES] != ~((0xdeadbeef << 31) + 0xdeafdeed))

	  {

	    fprintf (stderr, "gmp: (realloc) data clobbered after allocation block\n");

	    abort ();

	  }

      oldptr = p - 1;

    }

  new_size += 2 * GMP_LIMB_BYTES;

#endif

  ret = realloc (oldptr, new_size);

  if (ret == 0)

    {

      fprintf (stderr, "GNU MP: Cannot reallocate memory (old_size=%lu new_size=%lu)\n", (long) old_size, (long) new_size);

      abort ();

    }

#ifdef DEBUG

  {

    mp_ptr p = ret;

    p++;

    p[-1] = (0xdeadbeef << 31) + 0xdeafdeed;

    if (req_size % GMP_LIMB_BYTES == 0)

      p[req_size / GMP_LIMB_BYTES] = ~((0xdeadbeef << 31) + 0xdeafdeed);

    ret = p;

  }

#endif

  return ret;

}

void

__gmp_default_free (void *blk_ptr, size_t blk_size)

{

#ifdef DEBUG

  {

    mp_ptr p = blk_ptr;

    if (blk_size != 0)

      {

	if (p[-1] != (0xdeadbeef << 31) + 0xdeafdeed)

	  {

	    fprintf (stderr, "gmp: (free) data clobbered before allocation block\n");

	    abort ();

	  }

	if (blk_size % GMP_LIMB_BYTES == 0)

	  if (p[blk_size / GMP_LIMB_BYTES] != ~((0xdeadbeef << 31) + 0xdeafdeed))

	    {

	      fprintf (stderr, "gmp: (free) data clobbered after allocation block\n");

	      abort ();

	    }

      }

    blk_ptr = p - 1;

  }

#endif

  free (blk_ptr);

}