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/*
* Copyright (C) 2012 Alejandro Mery <amery@geeks.cl>
*
* 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 of the License, 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. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef _SUNXI_TOOLS_COMMON_H
#define _SUNXI_TOOLS_COMMON_H
#include <stddef.h> /* offsetof */
/** flag function argument as unused */
#ifdef UNUSED
#elif defined(__GNUC__)
# define UNUSED(x) UNUSED_ ## x __attribute__((unused))
#else
# define UNUSED(x) UNUSED_ ## x
#endif
/** finds the parent of an struct member */
#ifndef container_of
#define container_of(P,T,M) (T *)((char *)(P) - offsetof(T, M))
#endif
/** calculate number of elements of an array */
#ifndef ARRAY_SIZE
#define ARRAY_SIZE(A) (sizeof(A)/sizeof((A)[0]))
#endif
/** shortcut to printf to stderr */
#define errf(...) fprintf(stderr, __VA_ARGS__)
#endif /* _SUNXI_TOOLS_COMMON_H */
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