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/* SPDX-License-Identifier: LGPL-3.0-or-later */
/*
* util.h
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#ifndef UTIL_H
#define UTIL_H
#include "config.h"
#include "sqfs/predef.h"
#include <stdint.h>
#include <stddef.h>
#include "compat.h"
#define container_of(ptr, type, member) \
((type *)((char *)ptr - offsetof(type, member)))
/*
Helper for allocating data structures with flexible array members.
'base_size' is the size of the struct itself, 'item_size' the size of a
single array element and 'nmemb' the number of elements.
Iternally checks for arithmetic overflows when allocating the combined thing.
*/
SQFS_INTERNAL
void *alloc_flex(size_t base_size, size_t item_size, size_t nmemb);
/* Basically the same as calloc, but *ALWAYS* does overflow checking */
SQFS_INTERNAL
void *alloc_array(size_t item_size, size_t nmemb);
#endif /* UTIL_H */
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