static inline bool set_flag(int32 *fields, int32 bitmask, const char *arg)
static inline int set_flag(int32 *fields, int32 bitmask, const char *arg)
static inline bool set_flag(int32 *fields, int32 bitmask, const char *arg){	bool set = y_or_n_p(arg);		if (set)		*fields |= bitmask;	else		*fields &= ~bitmask;	return 0;}