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+/*
+ * Copyright (c) 2009-2015 Richard Braun.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ * Upstream site with license notes :
+ * http://git.sceen.net/rbraun/librbraun.git/
+ *
+ *
+ * Helper macros.
+ */
+
+#ifndef _MACROS_H
+#define _MACROS_H
+
+#if !defined(__GNUC__) || (__GNUC__ < 4)
+#error "GCC 4+ required"
+#endif
+
+#include <stddef.h>
+
+#define MACRO_BEGIN         ({
+#define MACRO_END           })
+
+#define __QUOTE(x)          #x
+#define QUOTE(x)            __QUOTE(x)
+
+#define STRLEN(x)           (sizeof(x) - 1)
+#define ARRAY_SIZE(x)       (sizeof(x) / sizeof((x)[0]))
+
+#define MIN(a, b)           ((a) < (b) ? (a) : (b))
+#define MAX(a, b)           ((a) > (b) ? (a) : (b))
+
+#define DIV_CEIL(n, d)      (((n) + (d) - 1) / (d))
+
+#define P2ALIGNED(x, a)     (((x) & ((a) - 1)) == 0)
+#define ISP2(x)             P2ALIGNED(x, x)
+#define P2ALIGN(x, a)       ((x) & -(a))        /* decreases if not aligned */
+#define P2ROUND(x, a)       (-(-(x) & -(a)))    /* increases if not aligned */
+#define P2END(x, a)         (-(~(x) & -(a)))    /* always increases */
+
+#define structof(ptr, type, member) \
+    ((type *)((char *)(ptr) - offsetof(type, member)))
+
+#define likely(expr)        __builtin_expect(!!(expr), 1)
+#define unlikely(expr)      __builtin_expect(!!(expr), 0)
+
+#define barrier()           asm volatile("" : : : "memory")
+
+/*
+ * The following macros may be provided by the C environment.
+ */
+
+#ifndef __noinline
+#define __noinline          __attribute__((noinline))
+#endif
+
+#ifndef __aligned
+#define __aligned(x)        __attribute__((aligned(x)))
+#endif
+
+#ifndef __always_inline
+#define __always_inline     inline __attribute__((always_inline))
+#endif
+
+#ifndef __section
+#define __section(x)        __attribute__((section(x)))
+#endif
+
+#ifndef __packed
+#define __packed            __attribute__((packed))
+#endif
+
+#ifndef __unused
+#define __unused            __attribute__((unused))
+#endif
+
+#endif /* _MACROS_H */