mirror of
https://github.com/sheumann/hush.git
synced 2024-08-17 00:29:03 +00:00
111 lines
2.3 KiB
C
111 lines
2.3 KiB
C
/* 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;
|
|
}
|
|
}
|