/* Copyright (C) 1991-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C 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 C 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 C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

#ifndef _MALLOC_INTERNAL

# define _MALLOC_INTERNAL

# include <malloc.h>

#endif

#ifndef __GNU_LIBRARY__

# define __sbrk  sbrk

#endif

#ifdef __GNU_LIBRARY__

/* It is best not to declare this and cast its result on foreign operating

   systems with potentially hostile include files.  */

# include <stddef.h>

# include <stdlib.h>

extern void *__sbrk (ptrdiff_t increment) __THROW;

libc_hidden_proto (__sbrk)

#endif

#ifndef NULL

# define NULL 0

#endif

/* Allocate INCREMENT more bytes of data space,

   and return the start of data space, or NULL on errors.

   If INCREMENT is negative, shrink data space.  */

void *

__default_morecore (ptrdiff_t increment)

{

  void *result = (void *) __sbrk (increment);

  if (result == (void *) -1)

    return NULL;

  return result;

}

libc_hidden_def (__default_morecore)