diff options
Diffstat (limited to 'nhrpd/list.h')
| -rw-r--r-- | nhrpd/list.h | 191 |
1 files changed, 191 insertions, 0 deletions
diff --git a/nhrpd/list.h b/nhrpd/list.h new file mode 100644 index 00000000..32f21ed5 --- /dev/null +++ b/nhrpd/list.h @@ -0,0 +1,191 @@ +/* Linux kernel style list handling function + * + * Written from scratch by Timo Teräs <timo.teras@iki.fi>, but modeled + * after the linux kernel code. + * + * This file is free software: you may copy, redistribute and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 2 of the License, or + * (at your option) any later version. + */ + +#ifndef LIST_H +#define LIST_H + +#ifndef NULL +#define NULL 0L +#endif + +#ifndef offsetof +#ifdef __compiler_offsetof +#define offsetof(TYPE,MEMBER) __compiler_offsetof(TYPE,MEMBER) +#else +#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER) +#endif +#endif + +#ifndef container_of +#define container_of(ptr, type, member) ({ \ + const typeof( ((type *)0)->member ) *__mptr = (ptr); \ + (type *)( (char *)__mptr - offsetof(type,member) );}) +#endif + +struct hlist_head { + struct hlist_node *first; +}; + +struct hlist_node { + struct hlist_node *next; + struct hlist_node **pprev; +}; + +static inline int hlist_empty(const struct hlist_head *h) +{ + return !h->first; +} + +static inline int hlist_hashed(const struct hlist_node *n) +{ + return n->pprev != NULL; +} + +static inline void hlist_del(struct hlist_node *n) +{ + struct hlist_node *next = n->next; + struct hlist_node **pprev = n->pprev; + + *pprev = next; + if (next) + next->pprev = pprev; + + n->next = NULL; + n->pprev = NULL; +} + +static inline void hlist_add_head(struct hlist_node *n, struct hlist_head *h) +{ + struct hlist_node *first = h->first; + + n->next = first; + if (first) + first->pprev = &n->next; + n->pprev = &h->first; + h->first = n; +} + +static inline void hlist_add_after(struct hlist_node *n, struct hlist_node *prev) +{ + n->next = prev->next; + n->pprev = &prev->next; + prev->next = n; +} + +static inline struct hlist_node **hlist_tail_ptr(struct hlist_head *h) +{ + struct hlist_node *n = h->first; + if (n == NULL) + return &h->first; + while (n->next != NULL) + n = n->next; + return &n->next; +} + +#define hlist_entry(ptr, type, member) container_of(ptr,type,member) + +#define hlist_for_each(pos, head) \ + for (pos = (head)->first; pos; pos = pos->next) + +#define hlist_for_each_safe(pos, n, head) \ + for (pos = (head)->first; pos && ({ n = pos->next; 1; }); pos = n) + +#define hlist_for_each_entry(tpos, pos, head, member) \ + for (pos = (head)->first; pos && \ + ({ tpos = hlist_entry(pos, typeof(*tpos), member); 1;}); \ + pos = pos->next) + +#define hlist_for_each_entry_safe(tpos, pos, n, head, member) \ + for (pos = (head)->first; \ + pos && ({ n = pos->next; 1; }) && \ + ({ tpos = hlist_entry(pos, typeof(*tpos), member); 1;}); \ + pos = n) + + +struct list_head { + struct list_head *next, *prev; +}; + +#define LIST_INITIALIZER(l) { .next = &l, .prev = &l } + +static inline void list_init(struct list_head *list) +{ + list->next = list; + list->prev = list; +} + +static inline void __list_add(struct list_head *new, + struct list_head *prev, + struct list_head *next) +{ + next->prev = new; + new->next = next; + new->prev = prev; + prev->next = new; +} + +static inline void list_add(struct list_head *new, struct list_head *head) +{ + __list_add(new, head, head->next); +} + +static inline void list_add_tail(struct list_head *new, struct list_head *head) +{ + __list_add(new, head->prev, head); +} + +static inline void __list_del(struct list_head * prev, struct list_head * next) +{ + next->prev = prev; + prev->next = next; +} + +static inline void list_del(struct list_head *entry) +{ + __list_del(entry->prev, entry->next); + entry->next = NULL; + entry->prev = NULL; +} + +static inline int list_hashed(const struct list_head *n) +{ + return n->next != n && n->next != NULL; +} + +static inline int list_empty(const struct list_head *n) +{ + return !list_hashed(n); +} + +#define list_next(ptr, type, member) \ + (list_hashed(ptr) ? container_of((ptr)->next,type,member) : NULL) + +#define list_entry(ptr, type, member) container_of(ptr,type,member) + +#define list_for_each(pos, head) \ + for (pos = (head)->next; pos != (head); pos = pos->next) + +#define list_for_each_safe(pos, n, head) \ + for (pos = (head)->next, n = pos->next; pos != (head); \ + pos = n, n = pos->next) + +#define list_for_each_entry(pos, head, member) \ + for (pos = list_entry((head)->next, typeof(*pos), member); \ + &pos->member != (head); \ + pos = list_entry(pos->member.next, typeof(*pos), member)) + +#define list_for_each_entry_safe(pos, n, head, member) \ + for (pos = list_entry((head)->next, typeof(*pos), member), \ + n = list_entry(pos->member.next, typeof(*pos), member); \ + &pos->member != (head); \ + pos = n, n = list_entry(n->member.next, typeof(*n), member)) + +#endif |