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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 */