diff options
Diffstat (limited to 'e2fsprogs/old_e2fsprogs/blkid/list.c')
-rw-r--r-- | e2fsprogs/old_e2fsprogs/blkid/list.c | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/e2fsprogs/old_e2fsprogs/blkid/list.c b/e2fsprogs/old_e2fsprogs/blkid/list.c new file mode 100644 index 000000000..04d61a19b --- /dev/null +++ b/e2fsprogs/old_e2fsprogs/blkid/list.c @@ -0,0 +1,110 @@ +/* vi: set sw=4 ts=4: */ + +#include "list.h" + +/* + * Insert a new entry between two known consecutive entries. + * + * This is only for internal list manipulation where we know + * the prev/next entries already! + */ +void __list_add(struct list_head * add, + struct list_head * prev, + struct list_head * next) +{ + next->prev = add; + add->next = next; + add->prev = prev; + prev->next = add; +} + +/* + * list_add - add a new entry + * @add: new entry to be added + * @head: list head to add it after + * + * Insert a new entry after the specified head. + * This is good for implementing stacks. + */ +void list_add(struct list_head *add, struct list_head *head) +{ + __list_add(add, head, head->next); +} + +/* + * list_add_tail - add a new entry + * @add: new entry to be added + * @head: list head to add it before + * + * Insert a new entry before the specified head. + * This is useful for implementing queues. + */ +void list_add_tail(struct list_head *add, struct list_head *head) +{ + __list_add(add, head->prev, head); +} + +/* + * Delete a list entry by making the prev/next entries + * point to each other. + * + * This is only for internal list manipulation where we know + * the prev/next entries already! + */ +void __list_del(struct list_head * prev, struct list_head * next) +{ + next->prev = prev; + prev->next = next; +} + +/* + * list_del - deletes entry from list. + * @entry: the element to delete from the list. + * + * list_empty() on @entry does not return true after this, @entry is + * in an undefined state. + */ +void list_del(struct list_head *entry) +{ + __list_del(entry->prev, entry->next); +} + +/* + * list_del_init - deletes entry from list and reinitialize it. + * @entry: the element to delete from the list. + */ +void list_del_init(struct list_head *entry) +{ + __list_del(entry->prev, entry->next); + INIT_LIST_HEAD(entry); +} + +/* + * list_empty - tests whether a list is empty + * @head: the list to test. + */ +int list_empty(struct list_head *head) +{ + return head->next == head; +} + +/* + * list_splice - join two lists + * @list: the new list to add. + * @head: the place to add it in the first list. + */ +void list_splice(struct list_head *list, struct list_head *head) +{ + struct list_head *first = list->next; + + if (first != list) { + struct list_head *last = list->prev; + struct list_head *at = head->next; + + first->prev = head; + head->next = first; + + last->next = at; + at->prev = last; + } +} |