blob: 96cd0d4381b0164f91bfb399c684d597738c4112 [file] [log] [blame]
/*
* Copyright (c) 2008 Travis Geiselbrecht
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files
* (the "Software"), to deal in the Software without restriction,
* including without limitation the rights to use, copy, modify, merge,
* publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef __LIST_H
#define __LIST_H
#include <sys/types.h>
#define containerof(ptr, type, member) \
((type *)((addr_t)(ptr) - offsetof(type, member)))
struct list_node {
struct list_node *prev;
struct list_node *next;
};
#define LIST_INITIAL_VALUE(list) { &(list), &(list) }
static inline void list_initialize(struct list_node *list)
{
list->prev = list->next = list;
}
static inline void list_clear_node(struct list_node *item)
{
item->prev = item->next = 0;
}
static inline bool list_in_list(struct list_node *item)
{
if (item->prev == 0 && item->next == 0)
return false;
else
return true;
}
static inline void list_add_head(struct list_node *list, struct list_node *item)
{
item->next = list->next;
item->prev = list;
list->next->prev = item;
list->next = item;
}
#define list_add_after(entry, new_entry) list_add_head(entry, new_entry)
static inline void list_add_tail(struct list_node *list, struct list_node *item)
{
item->prev = list->prev;
item->next = list;
list->prev->next = item;
list->prev = item;
}
#define list_add_before(entry, new_entry) list_add_tail(entry, new_entry)
static inline void list_delete(struct list_node *item)
{
item->next->prev = item->prev;
item->prev->next = item->next;
item->prev = item->next = 0;
}
static inline struct list_node* list_remove_head(struct list_node *list)
{
if(list->next != list) {
struct list_node *item = list->next;
list_delete(item);
return item;
} else {
return NULL;
}
}
#define list_remove_head_type(list, type, element) ({\
struct list_node *__nod = list_remove_head(list);\
type *__t;\
if(__nod)\
__t = containerof(__nod, type, element);\
else\
__t = (type *)0;\
__t;\
})
static inline struct list_node* list_remove_tail(struct list_node *list)
{
if(list->prev != list) {
struct list_node *item = list->prev;
list_delete(item);
return item;
} else {
return NULL;
}
}
#define list_remove_tail_type(list, type, element) ({\
struct list_node *__nod = list_remove_tail(list);\
type *__t;\
if(__nod)\
__t = containerof(__nod, type, element);\
else\
__t = (type *)0;\
__t;\
})
static inline struct list_node* list_peek_head(struct list_node *list)
{
if(list->next != list) {
return list->next;
} else {
return NULL;
}
}
#define list_peek_head_type(list, type, element) ({\
struct list_node *__nod = list_peek_head(list);\
type *__t;\
if(__nod)\
__t = containerof(__nod, type, element);\
else\
__t = (type *)0;\
__t;\
})
static inline struct list_node* list_peek_tail(struct list_node *list)
{
if(list->prev != list) {
return list->prev;
} else {
return NULL;
}
}
#define list_peek_tail_type(list, type, element) ({\
struct list_node *__nod = list_peek_tail(list);\
type *__t;\
if(__nod)\
__t = containerof(__nod, type, element);\
else\
__t = (type *)0;\
__t;\
})
static inline struct list_node* list_prev(struct list_node *list, struct list_node *item)
{
if(item->prev != list)
return item->prev;
else
return NULL;
}
#define list_prev_type(list, item, type, element) ({\
struct list_node *__nod = list_prev(list, item);\
type *__t;\
if(__nod)\
__t = containerof(__nod, type, element);\
else\
__t = (type *)0;\
__t;\
})
static inline struct list_node* list_prev_wrap(struct list_node *list, struct list_node *item)
{
if(item->prev != list)
return item->prev;
else if(item->prev->prev != list)
return item->prev->prev;
else
return NULL;
}
#define list_prev_wrap_type(list, item, type, element) ({\
struct list_node *__nod = list_prev_wrap(list, item);\
type *__t;\
if(__nod)\
__t = containerof(__nod, type, element);\
else\
__t = (type *)0;\
__t;\
})
static inline struct list_node* list_next(struct list_node *list, struct list_node *item)
{
if(item->next != list)
return item->next;
else
return NULL;
}
#define list_next_type(list, item, type, element) ({\
struct list_node *__nod = list_next(list, item);\
type *__t;\
if(__nod)\
__t = containerof(__nod, type, element);\
else\
__t = (type *)0;\
__t;\
})
static inline struct list_node* list_next_wrap(struct list_node *list, struct list_node *item)
{
if(item->next != list)
return item->next;
else if(item->next->next != list)
return item->next->next;
else
return NULL;
}
#define list_next_wrap_type(list, item, type, element) ({\
struct list_node *__nod = list_next_wrap(list, item);\
type *__t;\
if(__nod)\
__t = containerof(__nod, type, element);\
else\
__t = (type *)0;\
__t;\
})
// iterates over the list, node should be struct list_node*
#define list_for_every(list, node) \
for(node = (list)->next; node != (list); node = node->next)
// iterates over the list in a safe way for deletion of current node
// node and temp_node should be struct list_node*
#define list_for_every_safe(list, node, temp_node) \
for(node = (list)->next, temp_node = (node)->next;\
node != (list);\
node = temp_node, temp_node = (node)->next)
// iterates over the list, entry should be the container structure type *
#define list_for_every_entry(list, entry, type, member) \
for((entry) = containerof((list)->next, type, member);\
&(entry)->member != (list);\
(entry) = containerof((entry)->member.next, type, member))
// iterates over the list in a safe way for deletion of current node
// entry and temp_entry should be the container structure type *
#define list_for_every_entry_safe(list, entry, temp_entry, type, member) \
for(entry = containerof((list)->next, type, member),\
temp_entry = containerof((entry)->member.next, type, member);\
&(entry)->member != (list);\
entry = temp_entry, temp_entry = containerof((temp_entry)->member.next, type, member))
static inline bool list_is_empty(struct list_node *list)
{
return (list->next == list) ? true : false;
}
#endif