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#ifndef RT_STDDEF_H
#define RT_STDDEF_H
#define nil ((void*)0)
/* Generate a number with the x lowest bits set to 1 */
#define LOWER(X) ((1 << (X)) - 1)
/* Align a number to the upper boundary */
#define ALIGN_UP(X, F) ((X) - (X) % (F) + (F))
#endif
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