List
[Containers]

These functions provide list management. More...

Data Structures

struct  _Eina_List
 Type for a generic double linked list. More...
struct  _Eina_List_Accounting
 Cache used to store the last element of a list and the number of elements, for fast access. More...

Defines

#define EINA_LIST_FOREACH(list, l, data)
 Macro to iterate over a list.
#define EINA_LIST_REVERSE_FOREACH(list, l, data)
 Macro to iterate over a list in the reverse order.
#define EINA_LIST_FOREACH_SAFE(list, l, l_next, data)
 Macro to iterate over a list with support for node deletion.
#define EINA_LIST_REVERSE_FOREACH_SAFE(list, l, l_prev, data)
 Macro to iterate over a list in the reverse order with support for deletion.
#define EINA_LIST_FREE(list, data)
 Macro to remove each list node while having access to each node's data.

Typedefs

typedef struct _Eina_List Eina_List
 Type for a generic double linked list.
typedef struct
_Eina_List_Accounting 		Eina_List_Accounting
 Cache used to store the last element of a list and the number of elements, for fast access.

Functions

static Eina_List * eina_list_last (const Eina_List *list)
 Get the last list node in the list.
static Eina_List * eina_list_next (const Eina_List *list)
 Get the next list node after the specified list node.
static Eina_List * eina_list_prev (const Eina_List *list)
 Get the previous list node before the specified list node.
static void * eina_list_data_get (const Eina_List *list)
 Get the list node data member.
static void * eina_list_data_set (Eina_List *list, const void *data)
 Set the list node data member.
static unsigned int eina_list_count (const Eina_List *list)
 Get the count of the number of items in a list.
Eina_List * eina_list_append (Eina_List *list, const void *data)
 Append the given data to the given linked list.
Eina_List * eina_list_prepend (Eina_List *list, const void *data)
 Prepends the given data to the given linked list.
Eina_List * eina_list_append_relative (Eina_List *list, const void *data, const void *relative)
 Insert the given data into the given linked list after the specified data.
Eina_List * eina_list_append_relative_list (Eina_List *list, const void *data, Eina_List *relative)
 Append a list node to a linked list after the specified member.
Eina_List * eina_list_prepend_relative (Eina_List *list, const void *data, const void *relative)
 Prepend a data pointer to a linked list before the specified member.
Eina_List * eina_list_prepend_relative_list (Eina_List *list, const void *data, Eina_List *relative)
 Prepend a list node to a linked list before the specified member.
Eina_List * eina_list_sorted_insert (Eina_List *list, Eina_Compare_Cb func, const void *data)
 Insert a new node into a sorted list.
Eina_List * eina_list_remove (Eina_List *list, const void *data)
 Remove the first instance of the specified data from the given list.
Eina_List * eina_list_remove_list (Eina_List *list, Eina_List *remove_list)
 Remove the specified data.
Eina_List * eina_list_promote_list (Eina_List *list, Eina_List *move_list)
 Move the specified data to the head of the list.
Eina_List * eina_list_demote_list (Eina_List *list, Eina_List *move_list)
 Move the specified data to the tail of the list.
void * eina_list_data_find (const Eina_List *list, const void *data)
 Find a member of a list and return the member.
Eina_List * eina_list_data_find_list (const Eina_List *list, const void *data)
 Find a member of a list and return the list node containing that member.
Eina_List * eina_list_free (Eina_List *list)
 Free an entire list and all the nodes, ignoring the data contained.
void * eina_list_nth (const Eina_List *list, unsigned int n)
 Get the nth member's data pointer in a list.
Eina_List * eina_list_nth_list (const Eina_List *list, unsigned int n)
 Get the nth member's list node in a list.
Eina_List * eina_list_reverse (Eina_List *list)
 Reverse all the elements in the list.
Eina_List * eina_list_reverse_clone (const Eina_List *list)
 Clone (copy) all the elements in the list in reverse order.
Eina_List * eina_list_clone (const Eina_List *list)
 Clone (copy) all the elements in the list in exact order.
Eina_List * eina_list_sort (Eina_List *list, unsigned int size, Eina_Compare_Cb func)
 Sort a list according to the ordering func will return.
Eina_List * eina_list_merge (Eina_List *left, Eina_List *right)
 Merge two list.
Eina_List * eina_list_sorted_merge (Eina_List *left, Eina_List *right, Eina_Compare_Cb func)
 Merge two sorted list according to the ordering func will return.
Eina_List * eina_list_split_list (Eina_List *list, Eina_List *relative, Eina_List **right)
 Split a list into 2 lists.
Eina_List * eina_list_search_sorted_near_list (const Eina_List *list, Eina_Compare_Cb func, const void *data, int *result_cmp)
 Returns node nearest to data is in the sorted list.
Eina_List * eina_list_search_sorted_list (const Eina_List *list, Eina_Compare_Cb func, const void *data)
 Returns node if data is in the sorted list.
void * eina_list_search_sorted (const Eina_List *list, Eina_Compare_Cb func, const void *data)
 Returns node data if it is in the sorted list.
Eina_List * eina_list_search_unsorted_list (const Eina_List *list, Eina_Compare_Cb func, const void *data)
 Returns node if data is in the unsorted list.
void * eina_list_search_unsorted (const Eina_List *list, Eina_Compare_Cb func, const void *data)
 Returns node data if it is in the unsorted list.
Eina_Iterator * eina_list_iterator_new (const Eina_List *list)
 Returned a new iterator associated to a list.
Eina_Iterator * eina_list_iterator_reversed_new (const Eina_List *list)
 Returned a new reversed iterator associated to a list.
Eina_Accessor * eina_list_accessor_new (const Eina_List *list)
 Returned a new accessor associated to a list.

Detailed Description

These functions provide list management.

These functions provide double linked list management.

For more information, you can look at the List Tutorial.

Define Documentation

#define EINA_LIST_FOREACH ( list,
l,
data   ) 
Value:
for (l = list,                         \
       data = eina_list_data_get(l);     \
       l;                                \
       l = eina_list_next(l),            \
       data = eina_list_data_get(l))

Macro to iterate over a list.

Parameters:
list The list to iterate over.
l A list that is used as an iterator and points to the current node.
data Current item's data.

This macro iterates over list from the first element to the last. data is the data related to the current element. l is an Eina_List used as the list iterator.

It can be used to free list data, as in the following example:

 Eina_List *list;
 Eina_List *l;
 char      *data;

 // list is already filled,
 // its elements are just duplicated strings,
 // EINA_LIST_FOREACH will be used to free those strings

 EINA_LIST_FOREACH(list, l, data)
   free(data);
 eina_list_free(list);
Note:
This is not the optimal way to release memory allocated to a list, since it iterates over the list twice. For an optimized algorithm, use EINA_LIST_FREE().
Warning:
Be careful when deleting list nodes. If you remove the current node and continue iterating, the code will fail because the macro will not be able to get the next node. Notice that it's OK to remove any node if you stop the loop after that. For destructive operations such as this, consider using EINA_LIST_FOREACH_SAFE().
#define EINA_LIST_REVERSE_FOREACH ( list,
l,
data   ) 
Value:
for (l = eina_list_last(list),                 \
       data = eina_list_data_get(l);             \
       l;                                        \
       l = eina_list_prev(l),                    \
       data = eina_list_data_get(l))

Macro to iterate over a list in the reverse order.

Parameters:
list The list to iterate over.
l A list that is used as an iterator and points to the current node.
data Current item's data.

This macro works like EINA_LIST_FOREACH, but iterates from the last element of a list to the first. data is the data related to the current element, while l is an Eina_List that is used as the list iterator.

It can be used to free list data, as in the following example:

 Eina_List *list;
 Eina_List *l;
 char      *data;

 // list is already filled,
 // its elements are just duplicated strings,
 // EINA_LIST_REVERSE_FOREACH will be used to free those strings

 EINA_LIST_REVERSE_FOREACH(list, l, data)
   free(data);
 eina_list_free(list);
Note:
This is not the optimal way to release memory allocated to a list, since it iterates over the list twice. For an optimized algorithm, use EINA_LIST_FREE().
Warning:
Be careful when deleting list nodes. If you remove the current node and continue iterating, the code will fail because the macro will not be able to get the next node. Notice that it's OK to remove any node if you stop the loop after that. For destructive operations such as this, consider using EINA_LIST_REVERSE_FOREACH_SAFE().
#define EINA_LIST_FOREACH_SAFE ( list,
l,
l_next,
data   ) 
Value:
for (l = list,                                      \
       l_next = eina_list_next(l),                    \
       data = eina_list_data_get(l);                  \
       l;                                             \
       l = l_next,                                    \
       l_next = eina_list_next(l),                    \
       data = eina_list_data_get(l))

Macro to iterate over a list with support for node deletion.

Parameters:
list The list to iterate over.
l A list that is used as an iterator and points to the current node.
l_next A list that is used as an iterator and points to the next node.
data Current item's data.

This macro iterates over list from the first element to the last. data is the data related to the current element. l is an Eina_List used as the list iterator.

Since this macro stores a pointer to the next list node in l_next, deleting the current node and continuing looping is safe.

This macro can be used to free list nodes, as in the following example:

 Eina_List *list;
 Eina_List *l;
 Eina_List *l_next;
 char      *data;

 // list is already filled,
 // its elements are just duplicated strings,
 // EINA_LIST_FOREACH_SAFE will be used to free elements that match "key".

 EINA_LIST_FOREACH_SAFE(list, l, l_next, data)
   if (strcmp(data, "key") == 0) {
      free(data);
      list = eina_list_remove_list(list, l);
   }
#define EINA_LIST_REVERSE_FOREACH_SAFE ( list,
l,
l_prev,
data   ) 
Value:
for (l = eina_list_last(list),                              \
       l_prev = eina_list_prev(l),                            \
       data = eina_list_data_get(l);                          \
       l;                                                     \
       l = l_prev,                                            \
       l_prev = eina_list_prev(l),                            \
       data = eina_list_data_get(l))

Macro to iterate over a list in the reverse order with support for deletion.

Parameters:
list The list to iterate over.
l A list that is used as an iterator and points to the current node.
l_prev A list that is used as an iterator and points to the previous node.
data Current item's data.

This macro works like EINA_LIST_FOREACH_SAFE, but iterates from the last element of a list to the first. data is the data related to the current element, while l is an Eina_List that is used as the list iterator.

Since this macro stores a pointer to the previous list node in l_prev, deleting the current node and continuing looping is safe.

This macro can be used to free list nodes, as in the following example:

 Eina_List *list;
 Eina_List *l;
 Eina_List *l_prev;
 char       *data;

 // list is already filled,
 // its elements are just duplicated strings,
 // EINA_LIST_REVERSE_FOREACH_SAFE will be used to free elements that match "key".

 EINA_LIST_REVERSE_FOREACH_SAFE(list, l, l_prev, data)
   if (strcmp(data, "key") == 0) {
      free(data);
      list = eina_list_remove_list(list, l);
   }
#define EINA_LIST_FREE ( list,
data   ) 
Value:
for (data = eina_list_data_get(list);          \
       list;                                     \
       list = eina_list_remove_list(list, list), \
       data = eina_list_data_get(list))

Macro to remove each list node while having access to each node's data.

Parameters:
list The list that will be cleared.
data Current node's data.

This macro will call eina_list_remove_list for each list node, and store the data contained in the current node in data.

If you do not need to release node data, it is easier to call eina_list_free().

 Eina_List *list;
 char      *data;

 // list is already filled,
 // its elements are just duplicated strings,

 EINA_LIST_FREE(list, data)
   free(data);
See also:
eina_list_free()

Function Documentation

static Eina_List * eina_list_last ( const Eina_List *  list  )  [inline, static]

Get the last list node in the list.

Parameters:
list The list to get the last list node from.
Returns:
The last list node in the list.

This function returns the last list node in the list list. If list is NULL or empty, NULL is returned.

This is a order-1 operation (it takes the same short time regardless of the length of the list).

static Eina_List * eina_list_next ( const Eina_List *  list  )  [inline, static]

Get the next list node after the specified list node.

Parameters:
list The list node to get the next list node from
Returns:
The next list node on success, NULL otherwise.

This function returns the next list node after the current one in list. It is equivalent to list->next. If list is NULL or if no next list node exists, it returns NULL.

static Eina_List * eina_list_prev ( const Eina_List *  list  )  [inline, static]

Get the previous list node before the specified list node.

Parameters:
list The list node to get the previous list node from.
Returns:
The previous list node o success, NULL otherwise. if no previous list node exists

This function returns the previous list node before the current one in list. It is equivalent to list->prev. If list is NULL or if no previous list node exists, it returns NULL.

static void * eina_list_data_get ( const Eina_List *  list  )  [inline, static]

Get the list node data member.

Parameters:
list The list node to get the data member of.
Returns:
The data member from the list node.

This function returns the data member of the specified list node list. It is equivalent to list->data. If list is NULL, this function returns NULL.

static void* eina_list_data_set ( Eina_List *  list,
const void *  data 
) [inline, static]

Set the list node data member.

Parameters:
list The list node to get the data member of.
data The data member to the list node.
Returns:
The previous data value.

This function set the data member data of the specified list node list. It returns the previous data of the node. If list is NULL, this function returns NULL.

static unsigned int eina_list_count ( const Eina_List *  list  )  [inline, static]

Get the count of the number of items in a list.

Parameters:
list The list whose count to return.
Returns:
The number of members in the list.

This function returns how many members list contains. If the list is NULL, 0 is returned.

NB: This is an order-1 operation and takes the same time regardless of the length of the list.

Eina_List * eina_list_append ( Eina_List *  list,
const void *  data 
)

Append the given data to the given linked list.

Parameters:
list The given list.
data The data to append.
Returns:
A list pointer.

This function appends data to list. If list is NULL, a new list is returned. On success, a new list pointer that should be used in place of the one given to this function is returned. Otherwise, the old pointer is returned.

The following example code demonstrates how to ensure that the given data has been successfully appended.

 Eina_List *list = NULL;
 extern void *my_data;

 list = eina_list_append(list, my_data);
 if (eina_error_get())
   {
     fprintf(stderr, "ERROR: Memory is low. List allocation failed.\n");
     exit(-1);
   }
Eina_List * eina_list_prepend ( Eina_List *  list,
const void *  data 
)

Prepends the given data to the given linked list.

Parameters:
list The given list.
data The data to prepend.
Returns:
A list pointer.

This function prepends data to list. If list is NULL, a new list is returned. On success, a new list pointer that should be used in place of the one given to this function is returned. Otherwise, the old pointer is returned.

The following example code demonstrates how to ensure that the given data has been successfully prepended.

Example: 

 Eina_List *list = NULL;
 extern void *my_data;

 list = eina_list_prepend(list, my_data);
 if (eina_error_get())
   {
     fprintf(stderr, "ERROR: Memory is low. List allocation failed.\n");
     exit(-1);
   }
Eina_List * eina_list_append_relative ( Eina_List *  list,
const void *  data,
const void *  relative 
)

Insert the given data into the given linked list after the specified data.

Parameters:
list The given linked list.
data The data to insert.
relative The data to insert after.
Returns:
A list pointer.

This function inserts data to list after relative. If relative is not in the list, data is appended to the end of the list. If list is NULL, a new list is returned. If there are multiple instances of relative in the list, data is inserted after the first instance.On success, a new list pointer that should be used in place of the one given to this function is returned. Otherwise, the old pointer is returned.

The following example code demonstrates how to ensure that the given data has been successfully inserted.

 Eina_List *list = NULL;
 extern void *my_data;
 extern void *relative_member;

 list = eina_list_append(list, relative_member);
 if (eina_error_get())
   {
     fprintf(stderr, "ERROR: Memory is low. List allocation failed.\n");
     exit(-1);
   }
 list = eina_list_append_relative(list, my_data, relative_member);
 if (eina_error_get())
   {
     fprintf(stderr, "ERROR: Memory is low. List allocation failed.\n");
     exit(-1);
   }
Eina_List * eina_list_append_relative_list ( Eina_List *  list,
const void *  data,
Eina_List *  relative 
)

Append a list node to a linked list after the specified member.

Parameters:
list The given linked list.
data The data to insert.
relative The list node to insert after.
Returns:
A list pointer.

This function inserts data to list after the list node relative. If list or relative are NULL, data is just appended to list using eina_list_append(). If list is NULL, a new list is returned. If there are multiple instances of relative in the list, data is inserted after the first instance. On success, a new list pointer that should be used in place of the one given to this function is returned. Otherwise, the old pointer is returned.

Eina_List * eina_list_prepend_relative ( Eina_List *  list,
const void *  data,
const void *  relative 
)

Prepend a data pointer to a linked list before the specified member.

Parameters:
list The given linked list.
data The data to insert.
relative The data to insert before.
Returns:
A list pointer.

This function inserts data to list before relative. If relative is not in the list, data is prepended to the list with eina_list_prepend(). If list is NULL, a new list is returned. If there are multiple instances of relative in the list, data is inserted before the first instance. On success, a new list pointer that should be used in place of the one given to this function is returned. Otherwise, the old pointer is returned.

The following code example demonstrates how to ensure that the given data has been successfully inserted.

 Eina_List *list = NULL;
 extern void *my_data;
 extern void *relative_member;

 list = eina_list_append(list, relative_member);
 if (eina_error_get_error())
   {
     fprintf(stderr, "ERROR: Memory is low. List allocation failed.\n");
     exit(-1);
   }
 list = eina_list_prepend_relative(list, my_data, relative_member);
 if (eina_error_get())
   {
     fprintf(stderr, "ERROR: Memory is low. List allocation failed.\n");
     exit(-1);
   }
Eina_List * eina_list_prepend_relative_list ( Eina_List *  list,
const void *  data,
Eina_List *  relative 
)

Prepend a list node to a linked list before the specified member.

Parameters:
list The given linked list.
data The data to insert.
relative The list node to insert before.
Returns:
A list pointer.

This function inserts data to list before the list node relative. If list or relative are NULL, data is just prepended to list using eina_list_prepend(). If list is NULL, a new list is returned. If there are multiple instances of relative in the list, data is inserted before the first instance. On success, a new list pointer that should be used in place of the one given to this function is returned. Otherwise, the old pointer is returned.

Eina_List * eina_list_sorted_insert ( Eina_List *  list,
Eina_Compare_Cb  func,
const void *  data 
)

Insert a new node into a sorted list.

Parameters:
list The given linked list, must be sorted.
func The function called for the sort.
data The data to insert sorted.
Returns:
A list pointer.

This function inserts values into a linked list assuming it was sorted and the result will be sorted. If list is NULLL, a new list is returned. On success, a new list pointer that should be used in place of the one given to this function is returned. Otherwise, the old pointer is returned. See eina_error_get().

Note:
O(log2(n)) comparisons (calls to func) average/worst case performance as it uses eina_list_search_sorted_near_list() and thus is bounded to that. As said in eina_list_search_sorted_near_list(), lists do not have O(1) access time, so walking to the correct node can be costly, consider worst case to be almost O(n) pointer dereference (list walk).
Eina_List * eina_list_remove ( Eina_List *  list,
const void *  data 
)

Remove the first instance of the specified data from the given list.

Parameters:
list The given list.
data The specified data.
Returns:
A list pointer.

This function removes the first instance of data from list. If the specified data is not in the given list (tihis include the case where data is NULL), nothing is done. If list is NULL, NULL is returned, otherwise a new list pointer that should be used in place of the one passed to this function.

Eina_List * eina_list_remove_list ( Eina_List *  list,
Eina_List *  remove_list 
)

Remove the specified data.

Parameters:
list The given linked list.
remove_list The list node which is to be removed.
Returns:
A list pointer.

This function removes the list node remove_list from list and frees the list node structure remove_list. If list is NULL, this function returns NULL. If remove_list is NULL, it returns list, otherwise, a new list pointer that should be used in place of the one passed to this function.

The following code gives an example (notice we use EINA_LIST_FOREACH instead of EINA_LIST_FOREACH_SAFE because we stop the loop after removing the current node).

 extern Eina_List *list;
 Eina_List *l;
 extern void *my_data;
 void *data

 EINA_LIST_FOREACH(list, l, data)
   {
     if (data == my_data)
       {
         list = eina_list_remove_list(list, l);
         break;
       }
   }
Eina_List * eina_list_promote_list ( Eina_List *  list,
Eina_List *  move_list 
)

Move the specified data to the head of the list.

Parameters:
list The list handle to move the data.
move_list The list node to move.
Returns:
A new list handle to replace the old one

This function move move_list to the front of list. If list is NULL, NULL is returned. If move_list is NULL, list is returned. Otherwise, a new list pointer that should be used in place of the one passed to this function.

Example: 

 extern Eina_List *list;
 Eina_List *l;
 extern void *my_data;
 void *data;

 EINA_LIST_FOREACH(list, l, data)
   {
     if (data == my_data)
       {
         list = eina_list_promote_list(list, l);
         break;
       }
   }
Eina_List * eina_list_demote_list ( Eina_List *  list,
Eina_List *  move_list 
)

Move the specified data to the tail of the list.

Parameters:
list The list handle to move the data.
move_list The list node to move.
Returns:
A new list handle to replace the old one

This function move move_list to the back of list. If list is NULL, NULL is returned. If move_list is NULL, list is returned. Otherwise, a new list pointer that should be used in place of the one passed to this function.

Example: 

 extern Eina_List *list;
 Eina_List *l;
 extern void *my_data;
 void *data;

 EINA_LIST_FOREACH(list, l, data)
   {
     if (data == my_data)
       {
         list = eina_list_demote_list(list, l);
         break;
       }
   }
void * eina_list_data_find ( const Eina_List *  list,
const void *  data 
)

Find a member of a list and return the member.

Parameters:
list The list to search for a data.
data The data pointer to find in the list.
Returns:
The found member data pointer if foun, NULL otherwise.

This function searches in list from beginning to end for the first member whose data pointer is data. If it is found, data will be returned, otherwise NULL will be returned.

Example: 

 extern Eina_List *list;
 extern void *my_data;

 if (eina_list_data_find(list, my_data) == my_data)
   {
     printf("Found member %p\n", my_data);
   }
Eina_List * eina_list_data_find_list ( const Eina_List *  list,
const void *  data 
)

Find a member of a list and return the list node containing that member.

Parameters:
list The list to search for data.
data The data pointer to find in the list.
Returns:
The found members list node on success, NULL otherwise.

This function searches in list from beginning to end for the first member whose data pointer is data. If it is found, the list node containing the specified member is returned, otherwise NULL is returned.

Eina_List * eina_list_free ( Eina_List *  list  ) 

Free an entire list and all the nodes, ignoring the data contained.

Parameters:
list The list to free
Returns:
A NULL pointer

This function frees all the nodes of list. It does not free the data of the nodes. To free them, use EINA_LIST_FREE.

void * eina_list_nth ( const Eina_List *  list,
unsigned int  n 
)

Get the nth member's data pointer in a list.

Parameters:
list The list to get the specified member number from.
n The number of the element (0 being the first).
Returns:
The data pointer stored in the specified element.

This function returns the data pointer of element number n, in the list. The first element in the array is element number 0. If the element number n does not exist, NULL is returned. Otherwise, the data of the found element is returned.

Eina_List * eina_list_nth_list ( const Eina_List *  list,
unsigned int  n 
)

Get the nth member's list node in a list.

Parameters:
list The list to get the specfied member number from.
n The number of the element (0 being the first).
Returns:
The list node stored in the numbered element.

This function returns the list node of element number n, in @ list. The first element in the array is element number 0. If the element number n does not exist or list is NULL or n is greater than the count of elements in list minus 1, NULL is returned. Otherwise the list node stored in the numbered element is returned.

Eina_List * eina_list_reverse ( Eina_List *  list  ) 

Reverse all the elements in the list.

Parameters:
list The list to reverse.
Returns:
The list head after it has been reversed.

This function reverses the order of all elements in list, so the last member is now first, and so on. If list is NULL, this functon returns NULL.

Note:
in-place: this will change the given list, so you should now point to the new list head that is returned by this function.
See also:
eina_list_reverse_clone()
eina_list_iterator_reversed_new()
Eina_List * eina_list_reverse_clone ( const Eina_List *  list  ) 

Clone (copy) all the elements in the list in reverse order.

Parameters:
list The list to reverse.
Returns:
The new list that has been reversed.

This function reverses the order of all elements in list, so the last member is now first, and so on. If list is NULL, this functon returns NULL. This returns a copy of the given list.

Note:
copy: this will copy the list and you should then eina_list_free() when it is not required anymore.
See also:
eina_list_reverse()
eina_list_clone()
Eina_List * eina_list_clone ( const Eina_List *  list  ) 

Clone (copy) all the elements in the list in exact order.

Parameters:
list The list to clone.
Returns:
The new list that has been cloned.

This function clone in order of all elements in list. If list is NULL, this functon returns NULL. This returns a copy of the given list.

Note:
copy: this will copy the list and you should then eina_list_free() when it is not required anymore.
See also:
eina_list_reverse_clone()
Eina_List * eina_list_sort ( Eina_List *  list,
unsigned int  size,
Eina_Compare_Cb  func 
)

Sort a list according to the ordering func will return.

Parameters:
list The list handle to sort.
size The length of the list to sort.
func A function pointer that can handle comparing the list data nodes.
Returns:
the new head of list.

This function sorts list. size if the number of the first element to sort. If size is 0 or greater than the number of elements in list, all the elements are sorted. func is used to compare two elements of list. If list or func are NULL, this function returns NULL.

Note:
in-place: this will change the given list, so you should now point to the new list head that is returned by this function.
worst case is O(n * log2(n)) comparisons (calls to func()), O(n) comparisons average case. That means that for 1,000,000 list elements, sort will usually do 1,000,000 comparisons, but may do up to 20,000,000.

Example: 

 int
 sort_cb(const void *d1, const void *d2)
 {
    const char *txt = NULL;
    const char *txt2 = NULL;

    if(!txt) return(1);
    if(!txt2) return(-1);

    return(strcmp(txt, txt2));
 }
 extern Eina_List *list;

 list = eina_list_sort(list, eina_list_count(list), sort_cb);
Eina_List * eina_list_merge ( Eina_List *  left,
Eina_List *  right 
)

Merge two list.

Parameters:
left Head list to merge.
right Tail list to merge.
Returns:
A new merged list.

This function put right at the end of left and return the head.

Both left and right does not exist anymore after the merge.

Note:
merge cost is O(n), being n the size of the smallest list. This is due the need to fix accounting of that segment, making count and last access O(1).
Eina_List * eina_list_sorted_merge ( Eina_List *  left,
Eina_List *  right,
Eina_Compare_Cb  func 
)

Merge two sorted list according to the ordering func will return.

Parameters:
left First list to merge.
right Second list to merge.
func A function pointer that can handle comparing the list data nodes.
Returns:
A new sorted list.

This function compare the head of left and right, and choose the smallest one to be head of the returned list. It will continue this process for all entry of both list.

Both left and right does not exist anymore after the merge. If func is NULL, it will return NULL.

Example: 

 int
 sort_cb(void *d1, void *d2)
 {
   const char *txt = NULL;
    const char *txt2 = NULL;

    if(!d1) return(1);
    if(!d2) return(-1);

    return(strcmp((const char*)d1, (const char*)d2));
 }
 extern Eina_List *sorted1;
 extern Eina_List *sorted2;

 list = eina_list_sorted_merge(sorted1, sorted2, sort_cb);
Eina_List * eina_list_split_list ( Eina_List *  list,
Eina_List *  relative,
Eina_List **  right 
)

Split a list into 2 lists.

Parameters:
list List to split.
relative The list will be split after relative.
right The head of the new right list.
Returns:
The new left list

This function split list into two lists ( left and right ) after the node relative. Relative will become the last node of the left list. If list or right are NULL list is returns. If relative is NULL right is set to list and NULL is returns. If relative is the last node of list list is returns and right is set to NULL.

list does not exist anymore after the split.

Eina_List * eina_list_search_sorted_near_list ( const Eina_List *  list,
Eina_Compare_Cb  func,
const void *  data,
int *  result_cmp 
)

Returns node nearest to data is in the sorted list.

Parameters:
list The list to search for data, must be sorted.
func A function pointer that can handle comparing the list data nodes.
data reference value to search.
result_cmp if provided returns the result of func(node->data, data) node being the last (returned) node. If node was found (exact match), then it is 0. If returned node is smaller than requested data, it is less than 0 and if it's bigger it's greater than 0. It is the last value returned by func().
Returns:
the nearest node, NULL if not found.

This can be used to check if some value is inside the list and get the nearest container node in this case. It should be used when list is known to be sorted as it will do binary search for results.

Example: imagine user gives a string, you check if it's in the list before duplicating its contents, otherwise you want to insert it sorted. In this case you get the result of this function and either append or prepend the value.

Note:
O(log2(n)) average/worst case performance, for 1,000,000 elements it will do a maximum of 20 comparisons. This is much faster than the 1,000,000 comparisons made naively walking the list from head to tail, so depending on the number of searches and insertions, it may be worth to eina_list_sort() the list and do the searches later. As lists do not have O(1) access time, walking to the correct node can be costly, consider worst case to be almost O(n) pointer dereference (list walk).
See also:
eina_list_search_sorted_list()
eina_list_sort()
eina_list_sorted_merge()
Eina_List * eina_list_search_sorted_list ( const Eina_List *  list,
Eina_Compare_Cb  func,
const void *  data 
)

Returns node if data is in the sorted list.

Parameters:
list The list to search for data, must be sorted.
func A function pointer that can handle comparing the list data nodes.
data reference value to search.
Returns:
the node if func(node->data, data) == 0, NULL if not found.

This can be used to check if some value is inside the list and get the container node in this case. It should be used when list is known to be sorted as it will do binary search for results.

Example: imagine user gives a string, you check if it's in the list before duplicating its contents.

Note:
O(log2(n)) average/worst case performance, for 1,000,000 elements it will do a maximum of 20 comparisons. This is much faster than the 1,000,000 comparisons made by eina_list_search_unsorted_list(), so depending on the number of searches and insertions, it may be worth to eina_list_sort() the list and do the searches later. As said in eina_list_search_sorted_near_list(), lists do not have O(1) access time, so walking to the correct node can be costly, consider worst case to be almost O(n) pointer dereference (list walk).
See also:
eina_list_search_sorted()
eina_list_sort()
eina_list_sorted_merge()
eina_list_search_unsorted_list()
eina_list_search_sorted_near_list()
void * eina_list_search_sorted ( const Eina_List *  list,
Eina_Compare_Cb  func,
const void *  data 
)

Returns node data if it is in the sorted list.

Parameters:
list The list to search for data, must be sorted.
func A function pointer that can handle comparing the list data nodes.
data reference value to search.
Returns:
the node value (node->data) if func(node->data, data) == 0, NULL if not found.

This can be used to check if some value is inside the list and get the existing instance in this case. It should be used when list is known to be sorted as it will do binary search for results.

Example: imagine user gives a string, you check if it's in the list before duplicating its contents.

Note:
O(log2(n)) average/worst case performance, for 1,000,000 elements it will do a maximum of 20 comparisons. This is much faster than the 1,000,000 comparisons made by eina_list_search_unsorted(), so depending on the number of searches and insertions, it may be worth to eina_list_sort() the list and do the searches later. As said in eina_list_search_sorted_near_list(), lists do not have O(1) access time, so walking to the correct node can be costly, consider worst case to be almost O(n) pointer dereference (list walk).
See also:
eina_list_search_sorted_list()
eina_list_sort()
eina_list_sorted_merge()
eina_list_search_unsorted_list()
Eina_List * eina_list_search_unsorted_list ( const Eina_List *  list,
Eina_Compare_Cb  func,
const void *  data 
)

Returns node if data is in the unsorted list.

Parameters:
list The list to search for data, may be unsorted.
func A function pointer that can handle comparing the list data nodes.
data reference value to search.
Returns:
the node if func(node->data, data) == 0, NULL if not found.

This can be used to check if some value is inside the list and get the container node in this case.

Example: imagine user gives a string, you check if it's in the list before duplicating its contents.

Note:
this is expensive and may walk the whole list, it's order-N, that is for 1,000,000 elements list it may walk and compare 1,000,000 nodes.
See also:
eina_list_search_sorted_list()
eina_list_search_unsorted()
void * eina_list_search_unsorted ( const Eina_List *  list,
Eina_Compare_Cb  func,
const void *  data 
)

Returns node data if it is in the unsorted list.

Parameters:
list The list to search for data, may be unsorted.
func A function pointer that can handle comparing the list data nodes.
data reference value to search.
Returns:
the node value (node->data) if func(node->data, data) == 0, NULL if not found.

This can be used to check if some value is inside the list and get the existing instance in this case.

Example: imagine user gives a string, you check if it's in the list before duplicating its contents.

Note:
this is expensive and may walk the whole list, it's order-N, that is for 1,000,000 elements list it may walk and compare 1,000,000 nodes.
See also:
eina_list_search_sorted()
eina_list_search_unsorted_list()
Eina_Iterator * eina_list_iterator_new ( const Eina_List *  list  ) 

Returned a new iterator associated to a list.

Parameters:
list The list.
Returns:
A new iterator.

This function returns a newly allocated iterator associated to list. If list is NULL or the count member of list is less or equal than 0, this function still returns a valid iterator that will always return false on eina_iterator_next(), thus keeping API sane.

If the memory can not be allocated, NULL is returned and EINA_ERROR_OUT_OF_MEMORY is set. Otherwise, a valid iterator is returned.

Warning:
if the list structure changes then the iterator becomes invalid! That is, if you add or remove nodes this iterator behavior is undefined and your program may crash!
Eina_Iterator * eina_list_iterator_reversed_new ( const Eina_List *  list  ) 

Returned a new reversed iterator associated to a list.

Parameters:
list The list.
Returns:
A new iterator.

This function returns a newly allocated iterator associated to list. If list is NULL or the count member of list is less or equal than 0, this function still returns a valid iterator that will always return false on eina_iterator_next(), thus keeping API sane.

Unlike eina_list_iterator_new(), this will walk the list backwards.

If the memory can not be allocated, NULL is returned and EINA_ERROR_OUT_OF_MEMORY is set. Otherwise, a valid iterator is returned.

Warning:
if the list structure changes then the iterator becomes invalid! That is, if you add or remove nodes this iterator behavior is undefined and your program may crash!
Eina_Accessor * eina_list_accessor_new ( const Eina_List *  list  ) 

Returned a new accessor associated to a list.

Parameters:
list The list.
Returns:
A new accessor.

This function returns a newly allocated accessor associated to list. If list is NULL or the count member of list is less or equal than 0, this function returns NULL. If the memory can not be allocated, NULL is returned and EINA_ERROR_OUT_OF_MEMORY is set. Otherwise, a valid accessor is returned.