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/* Copyright (C) 2001-2021 Red Hat, Inc.
Copyright (C) 2003 Free Software Foundation, Inc.
Copyright (C) 2019-2021 SUSE LLC.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
This program 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 a copy of the GNU General Public License
along with this program; see the file COPYING. If not, write to
the Free Software Foundation, 51 Franklin Street - Fifth Floor,
Boston, MA 02110-1301, USA. */
/* Wrapper around obstack.h that changes obstack_free (obstack_ptr, object) to
also nullify object. Since that breaks obstack_free (obstack_ptr, NULL), a
new function obstack_destroy is added to support that functionaliy. */
#include <obstack.h>
/* Required definitions for obstack use. */
#define obstack_chunk_alloc malloc
#define obstack_chunk_free free
/* Free *OBJECT, and assign NULL to it. */
static inline void
obstack_free_and_nullify (struct obstack *obstack_ptr, void **object)
{
/* Don't attempt to free nullified *OBJECT. */
assert (*object != NULL);
obstack_free (obstack_ptr, *object);
/* Nullify *OBJECT to prevent use-after-free. */
*object = NULL;
}
/* Free all objects in OBSTACK_PTR, and leave the obstack uninitialized. */
static inline void
obstack_destroy (struct obstack *obstack_ptr)
{
obstack_free (obstack_ptr, NULL);
}
/* In case obstack_free is implemented as a macro, undefine it in order to be
able to redefine it. */
#undef obstack_free
/* Redefine obstack_free to nullify OBJECT. */
#define obstack_free(obstack_ptr, object) \
obstack_free_and_nullify (obstack_ptr, (void **)&object)
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