+/* Ugly structure handling macros */
+
+#define OFFSETOF(s, i) ((unsigned int)&((s *)0)->i)
+#define SKIP_BACK(s, i, p) ((s *)((char *)p - OFFSETOF(s, i)))
+#define ALIGN(s, a) (((s)+a-1)&~(a-1))
+#define ALIGN_PTR(p, s) ((addr_int_t)(p) % (s) ? (typeof(p))((addr_int_t)(p) + (s) - (addr_int_t)(p) % (s)) : (p))
+#define UNALIGNED_PART(ptr, type) (((addr_int_t) (ptr)) % sizeof(type))
+
+/* Some other macros */
+
+#define MIN(a,b) (((a)<(b))?(a):(b))
+#define MAX(a,b) (((a)>(b))?(a):(b))
+#define CLAMP(x,min,max) ({ int _t=x; (_t < min) ? min : (_t > max) ? max : _t; })
+#define ABS(x) ((x) < 0 ? -(x) : (x))
+#define ARRAY_SIZE(a) (sizeof(a)/sizeof(*(a)))
+#define STRINGIFY(x) #x
+#define STRINGIFY_EXPANDED(x) STRINGIFY(x)
+#define GLUE(x,y) x##y
+#define GLUE_(x,y) x##_##y
+
+#define COMPARE(x,y) do { if ((x)<(y)) return -1; if ((x)>(y)) return 1; } while(0)
+#define REV_COMPARE(x,y) COMPARE(y,x)
+#define COMPARE_LT(x,y) do { if ((x)<(y)) return 1; if ((x)>(y)) return 0; } while(0)
+#define COMPARE_GT(x,y) COMPARE_LT(y,x)
+
+#define ROL(x, bits) (((x) << (bits)) | ((x) >> (sizeof(uns)*8 - (bits)))) /* Bitwise rotation of an uns to the left */
+
+/* GCC Extensions */
+
+#ifdef __GNUC__
+
+#undef inline
+#define NONRET __attribute__((noreturn))
+#define UNUSED __attribute__((unused))
+#define CONSTRUCTOR __attribute__((constructor))
+#define PACKED __attribute__((packed))
+#define CONST __attribute__((const))
+#define PURE __attribute__((const))
+#define FORMAT_CHECK(x,y,z) __attribute__((format(x,y,z)))
+#define likely(x) __builtin_expect((x),1)
+#define unlikely(x) __builtin_expect((x),0)
+
+#else
+#error This program requires the GNU C compiler.
+#endif