tree.h

honeyd1.0的源代码 希望对大家有用

	RB_AUGMENT(elm);						\
	if ((RB_PARENT(tmp, field) = RB_PARENT(elm, field))) {		\
		if ((elm) == RB_LEFT(RB_PARENT(elm, field), field))	\
			RB_LEFT(RB_PARENT(elm, field), field) = (tmp);	\
		else							\
			RB_RIGHT(RB_PARENT(elm, field), field) = (tmp);	\
	} else								\
		(head)->rbh_root = (tmp);				\
	RB_LEFT(tmp, field) = (elm);					\
	RB_PARENT(elm, field) = (tmp);					\
	RB_AUGMENT(tmp);						\
	if ((RB_PARENT(tmp, field)))					\
		RB_AUGMENT(RB_PARENT(tmp, field));			\
} while (0)

#define RB_ROTATE_RIGHT(head, elm, tmp, field) do {			\
	(tmp) = RB_LEFT(elm, field);					\
	if ((RB_LEFT(elm, field) = RB_RIGHT(tmp, field))) {		\
		RB_PARENT(RB_RIGHT(tmp, field), field) = (elm);		\
	}								\
	RB_AUGMENT(elm);						\
	if ((RB_PARENT(tmp, field) = RB_PARENT(elm, field))) {		\
		if ((elm) == RB_LEFT(RB_PARENT(elm, field), field))	\
			RB_LEFT(RB_PARENT(elm, field), field) = (tmp);	\
		else							\
			RB_RIGHT(RB_PARENT(elm, field), field) = (tmp);	\
	} else								\
		(head)->rbh_root = (tmp);				\
	RB_RIGHT(tmp, field) = (elm);					\
	RB_PARENT(elm, field) = (tmp);					\
	RB_AUGMENT(tmp);						\
	if ((RB_PARENT(tmp, field)))					\
		RB_AUGMENT(RB_PARENT(tmp, field));			\
} while (0)

/* Generates prototypes and inline functions */
#define RB_PROTOTYPE(name, type, field, cmp)				\
void name##_RB_INSERT_COLOR(struct name *, struct type *);	\
void name##_RB_REMOVE_COLOR(struct name *, struct type *, struct type *);\
struct type *name##_RB_REMOVE(struct name *, struct type *);		\
struct type *name##_RB_INSERT(struct name *, struct type *);		\
struct type *name##_RB_FIND(struct name *, struct type *);		\
struct type *name##_RB_NEXT(struct type *);				\
struct type *name##_RB_MINMAX(struct name *, int);			\
									\

/* Main rb operation.
 * Moves node close to the key of elm to top
 */
#define RB_GENERATE(name, type, field, cmp)				\
void									\
name##_RB_INSERT_COLOR(struct name *head, struct type *elm)		\
{									\
	struct type *parent, *gparent, *tmp;				\
	while ((parent = RB_PARENT(elm, field)) &&			\
	    RB_COLOR(parent, field) == RB_RED) {			\
		gparent = RB_PARENT(parent, field);			\
		if (parent == RB_LEFT(gparent, field)) {		\
			tmp = RB_RIGHT(gparent, field);			\
			if (tmp && RB_COLOR(tmp, field) == RB_RED) {	\
				RB_COLOR(tmp, field) = RB_BLACK;	\
				RB_SET_BLACKRED(parent, gparent, field);\
				elm = gparent;				\
				continue;				\
			}						\
			if (RB_RIGHT(parent, field) == elm) {		\
				RB_ROTATE_LEFT(head, parent, tmp, field);\
				tmp = parent;				\
				parent = elm;				\
				elm = tmp;				\
			}						\
			RB_SET_BLACKRED(parent, gparent, field);	\
			RB_ROTATE_RIGHT(head, gparent, tmp, field);	\
		} else {						\
			tmp = RB_LEFT(gparent, field);			\
			if (tmp && RB_COLOR(tmp, field) == RB_RED) {	\
				RB_COLOR(tmp, field) = RB_BLACK;	\
				RB_SET_BLACKRED(parent, gparent, field);\
				elm = gparent;				\
				continue;				\
			}						\
			if (RB_LEFT(parent, field) == elm) {		\
				RB_ROTATE_RIGHT(head, parent, tmp, field);\
				tmp = parent;				\
				parent = elm;				\
				elm = tmp;				\
			}						\
			RB_SET_BLACKRED(parent, gparent, field);	\
			RB_ROTATE_LEFT(head, gparent, tmp, field);	\
		}							\
	}								\
	RB_COLOR(head->rbh_root, field) = RB_BLACK;			\
}									\
									\
void									\
name##_RB_REMOVE_COLOR(struct name *head, struct type *parent, struct type *elm) \
{									\
	struct type *tmp;						\
	while ((elm == NULL || RB_COLOR(elm, field) == RB_BLACK) &&	\
	    elm != RB_ROOT(head)) {					\
		if (RB_LEFT(parent, field) == elm) {			\
			tmp = RB_RIGHT(parent, field);			\
			if (RB_COLOR(tmp, field) == RB_RED) {		\
				RB_SET_BLACKRED(tmp, parent, field);	\
				RB_ROTATE_LEFT(head, parent, tmp, field);\
				tmp = RB_RIGHT(parent, field);		\
			}						\
			if ((RB_LEFT(tmp, field) == NULL ||		\
			    RB_COLOR(RB_LEFT(tmp, field), field) == RB_BLACK) &&\
			    (RB_RIGHT(tmp, field) == NULL ||		\
			    RB_COLOR(RB_RIGHT(tmp, field), field) == RB_BLACK)) {\
				RB_COLOR(tmp, field) = RB_RED;		\
				elm = parent;				\
				parent = RB_PARENT(elm, field);		\
			} else {					\
				if (RB_RIGHT(tmp, field) == NULL ||	\
				    RB_COLOR(RB_RIGHT(tmp, field), field) == RB_BLACK) {\
					struct type *oleft;		\
					if ((oleft = RB_LEFT(tmp, field)))\
						RB_COLOR(oleft, field) = RB_BLACK;\
					RB_COLOR(tmp, field) = RB_RED;	\
					RB_ROTATE_RIGHT(head, tmp, oleft, field);\
					tmp = RB_RIGHT(parent, field);	\
				}					\
				RB_COLOR(tmp, field) = RB_COLOR(parent, field);\
				RB_COLOR(parent, field) = RB_BLACK;	\
				if (RB_RIGHT(tmp, field))		\
					RB_COLOR(RB_RIGHT(tmp, field), field) = RB_BLACK;\
				RB_ROTATE_LEFT(head, parent, tmp, field);\
				elm = RB_ROOT(head);			\
				break;					\
			}						\
		} else {						\
			tmp = RB_LEFT(parent, field);			\
			if (RB_COLOR(tmp, field) == RB_RED) {		\
				RB_SET_BLACKRED(tmp, parent, field);	\
				RB_ROTATE_RIGHT(head, parent, tmp, field);\
				tmp = RB_LEFT(parent, field);		\
			}						\
			if ((RB_LEFT(tmp, field) == NULL ||		\
			    RB_COLOR(RB_LEFT(tmp, field), field) == RB_BLACK) &&\
			    (RB_RIGHT(tmp, field) == NULL ||		\
			    RB_COLOR(RB_RIGHT(tmp, field), field) == RB_BLACK)) {\
				RB_COLOR(tmp, field) = RB_RED;		\
				elm = parent;				\
				parent = RB_PARENT(elm, field);		\
			} else {					\
				if (RB_LEFT(tmp, field) == NULL ||	\
				    RB_COLOR(RB_LEFT(tmp, field), field) == RB_BLACK) {\
					struct type *oright;		\
					if ((oright = RB_RIGHT(tmp, field)))\
						RB_COLOR(oright, field) = RB_BLACK;\
					RB_COLOR(tmp, field) = RB_RED;	\
					RB_ROTATE_LEFT(head, tmp, oright, field);\
					tmp = RB_LEFT(parent, field);	\
				}					\
				RB_COLOR(tmp, field) = RB_COLOR(parent, field);\
				RB_COLOR(parent, field) = RB_BLACK;	\
				if (RB_LEFT(tmp, field))		\
					RB_COLOR(RB_LEFT(tmp, field), field) = RB_BLACK;\
				RB_ROTATE_RIGHT(head, parent, tmp, field);\
				elm = RB_ROOT(head);			\
				break;					\
			}						\
		}							\
	}								\
	if (elm)							\
		RB_COLOR(elm, field) = RB_BLACK;			\
}									\
									\
struct type *								\
name##_RB_REMOVE(struct name *head, struct type *elm)			\
{									\
	struct type *child, *parent, *old = elm;			\
	int color;							\
	if (RB_LEFT(elm, field) == NULL)				\
		child = RB_RIGHT(elm, field);				\
	else if (RB_RIGHT(elm, field) == NULL)				\
		child = RB_LEFT(elm, field);				\
	else {								\
		struct type *left;					\
		elm = RB_RIGHT(elm, field);				\
		while ((left = RB_LEFT(elm, field)))			\
			elm = left;					\
		child = RB_RIGHT(elm, field);				\
		parent = RB_PARENT(elm, field);				\
		color = RB_COLOR(elm, field);				\
		if (child)						\
			RB_PARENT(child, field) = parent;		\
		if (parent) {						\
			if (RB_LEFT(parent, field) == elm)		\
				RB_LEFT(parent, field) = child;		\
			else						\
				RB_RIGHT(parent, field) = child;	\
			RB_AUGMENT(parent);				\
		} else							\
			RB_ROOT(head) = child;				\
		if (RB_PARENT(elm, field) == old)			\
			parent = elm;					\
		(elm)->field = (old)->field;				\
		if (RB_PARENT(old, field)) {				\
			if (RB_LEFT(RB_PARENT(old, field), field) == old)\
				RB_LEFT(RB_PARENT(old, field), field) = elm;\
			else						\
				RB_RIGHT(RB_PARENT(old, field), field) = elm;\
			RB_AUGMENT(RB_PARENT(old, field));		\
		} else							\
			RB_ROOT(head) = elm;				\
		RB_PARENT(RB_LEFT(old, field), field) = elm;		\
		if (RB_RIGHT(old, field))				\
			RB_PARENT(RB_RIGHT(old, field), field) = elm;	\
		if (parent) {						\
			left = parent;					\
			do {						\
				RB_AUGMENT(left);			\
			} while ((left = RB_PARENT(left, field)));	\
		}							\
		goto color;						\
	}								\
	parent = RB_PARENT(elm, field);					\
	color = RB_COLOR(elm, field);					\
	if (child)							\
		RB_PARENT(child, field) = parent;			\
	if (parent) {							\
		if (RB_LEFT(parent, field) == elm)			\
			RB_LEFT(parent, field) = child;			\
		else							\
			RB_RIGHT(parent, field) = child;		\
		RB_AUGMENT(parent);					\
	} else								\
		RB_ROOT(head) = child;					\
color:									\
	if (color == RB_BLACK)						\
		name##_RB_REMOVE_COLOR(head, parent, child);		\
	return (old);							\
}									\
									\
/* Inserts a node into the RB tree */					\
struct type *								\
name##_RB_INSERT(struct name *head, struct type *elm)			\
{									\
	struct type *tmp;						\
	struct type *parent = NULL;					\
	int comp = 0;							\
	tmp = RB_ROOT(head);						\
	while (tmp) {							\
		parent = tmp;						\
		comp = (cmp)(elm, parent);				\
		if (comp < 0)						\
			tmp = RB_LEFT(tmp, field);			\
		else if (comp > 0)					\
			tmp = RB_RIGHT(tmp, field);			\
		else							\
			return (tmp);					\
	}								\
	RB_SET(elm, parent, field);					\
	if (parent != NULL) {						\
		if (comp < 0)						\
			RB_LEFT(parent, field) = elm;			\
		else							\
			RB_RIGHT(parent, field) = elm;			\
		RB_AUGMENT(parent);					\
	} else								\
		RB_ROOT(head) = elm;					\
	name##_RB_INSERT_COLOR(head, elm);				\
	return (NULL);							\
}									\
									\
/* Finds the node with the same key as elm */				\
struct type *								\
name##_RB_FIND(struct name *head, struct type *elm)			\
{									\
	struct type *tmp = RB_ROOT(head);				\
	int comp;							\
	while (tmp) {							\
		comp = cmp(elm, tmp);					\
		if (comp < 0)						\
			tmp = RB_LEFT(tmp, field);			\
		else if (comp > 0)					\
			tmp = RB_RIGHT(tmp, field);			\
		else							\
			return (tmp);					\
	}								\
	return (NULL);							\
}									\
									\
struct type *								\
name##_RB_NEXT(struct type *elm)					\
{									\
	if (RB_RIGHT(elm, field)) {					\
		elm = RB_RIGHT(elm, field);				\
		while (RB_LEFT(elm, field))				\
			elm = RB_LEFT(elm, field);			\
	} else {							\
		if (RB_PARENT(elm, field) &&				\
		    (elm == RB_LEFT(RB_PARENT(elm, field), field)))	\
			elm = RB_PARENT(elm, field);			\
		else {							\
			while (RB_PARENT(elm, field) &&			\
			    (elm == RB_RIGHT(RB_PARENT(elm, field), field)))\
				elm = RB_PARENT(elm, field);		\
			elm = RB_PARENT(elm, field);			\
		}							\
	}								\
	return (elm);							\
}									\
									\
struct type *								\
name##_RB_MINMAX(struct name *head, int val)				\
{									\
	struct type *tmp = RB_ROOT(head);				\
	struct type *parent = NULL;					\
	while (tmp) {							\
		parent = tmp;						\
		if (val < 0)						\
			tmp = RB_LEFT(tmp, field);			\
		else							\
			tmp = RB_RIGHT(tmp, field);			\
	}								\
	return (parent);						\
}

#define RB_NEGINF	-1
#define RB_INF	1

#define RB_INSERT(name, x, y)	name##_RB_INSERT(x, y)
#define RB_REMOVE(name, x, y)	name##_RB_REMOVE(x, y)
#define RB_FIND(name, x, y)	name##_RB_FIND(x, y)
#define RB_NEXT(name, x, y)	name##_RB_NEXT(y)
#define RB_MIN(name, x)		name##_RB_MINMAX(x, RB_NEGINF)
#define RB_MAX(name, x)		name##_RB_MINMAX(x, RB_INF)

#define RB_FOREACH(x, name, head)					\
	for ((x) = RB_MIN(name, head);					\
	     (x) != NULL;						\
	     (x) = name##_RB_NEXT(x))

#endif	/* _SYS_TREE_H_ */