1/* Copyright (C) 1991-2020 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
17
18#ifndef _MALLOC_INTERNAL
19# define _MALLOC_INTERNAL
20# include <malloc.h>
21#endif
22
23#ifndef __GNU_LIBRARY__
24# define __sbrk sbrk
25#endif
26
27#ifdef __GNU_LIBRARY__
28/* It is best not to declare this and cast its result on foreign operating
29 systems with potentially hostile include files. */
30
31# include <stddef.h>
32# include <stdlib.h>
33extern void *__sbrk (ptrdiff_t increment) __THROW;
34libc_hidden_proto (__sbrk)
35#endif
36
37#ifndef NULL
38# define NULL 0
39#endif
40
41/* Allocate INCREMENT more bytes of data space,
42 and return the start of data space, or NULL on errors.
43 If INCREMENT is negative, shrink data space. */
44void *
45__default_morecore (ptrdiff_t increment)
46{
47 void *result = (void *) __sbrk (increment);
48 if (result == (void *) -1)
49 return NULL;
50
51 return result;
52}
53libc_hidden_def (__default_morecore)
54