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find methods for linked lists

This commit is contained in:
Tobias Brunner 2008-02-14 12:29:29 +00:00
parent 298c9c8eed
commit e3311a40f0
2 changed files with 105 additions and 0 deletions
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48
src/libstrongswan/utils/linked_list.c
View File

@ -676,6 +676,52 @@ static status_t get_last(private_linked_list_t *this, void **item)
return SUCCESS;
}
/**
* Implementation of linked_list_t.find_first.
*/
static status_t find_first(private_linked_list_t *this, linked_list_match_t match,
void **item, void *d1, void *d2, void *d3, void *d4, void *d5)
{
element_t *current = this->first;
while (current)
{
if (match(current->value, d1, d2, d3, d4, d5))
{
if (item != NULL)
{
*item = current->value;
}
return SUCCESS;
}
current = current->next;
}
return NOT_FOUND;
}
/**
* Implementation of linked_list_t.find_last.
*/
static status_t find_last(private_linked_list_t *this, linked_list_match_t match,
void **item, void *d1, void *d2, void *d3, void *d4, void *d5)
{
element_t *current = this->last;
while (current)
{
if (match(current->value, d1, d2, d3, d4, d5))
{
if (item != NULL)
{
*item = current->value;
}
return SUCCESS;
}
current = current->previous;
}
return NOT_FOUND;
}
/**
* Implementation of linked_list_t.invoke_offset.
*/
@ -843,6 +889,8 @@ linked_list_t *linked_list_create()
this->public.create_enumerator = (enumerator_t*(*)(linked_list_t*))create_enumerator;
this->public.get_first = (status_t (*) (linked_list_t *, void **item))get_first;
this->public.get_last = (status_t (*) (linked_list_t *, void **item))get_last;
this->public.find_first = (status_t (*) (linked_list_t *, linked_list_match_t,void**,...))find_first;
this->public.find_last = (status_t (*) (linked_list_t *, linked_list_match_t,void**,...))find_last;
this->public.insert_first = (void (*) (linked_list_t *, void *item))insert_first;
this->public.insert_last = (void (*) (linked_list_t *, void *item))insert_last;
this->public.remove_first = (status_t (*) (linked_list_t *, void **item))remove_first;

57
src/libstrongswan/utils/linked_list.h
View File

@ -33,6 +33,19 @@ typedef struct linked_list_t linked_list_t;
#include <utils/iterator.h>
#include <utils/enumerator.h>
/**
* Method to match elements in a linked list (used in find_* functions)
*
* @param item current list item
* @param ... user supplied data (only pointers, at most 5)
* @return
* - TRUE, if the item matched
* - FALSE, otherwise
* @ingroup utils
*/
typedef bool (*linked_list_match_t)(void *item, ...);
/**
* @brief Class implementing a double linked list.
*
@ -187,6 +200,50 @@ struct linked_list_t {
*/
status_t (*get_last) (linked_list_t *this, void **item);
/** @brief Find the first matching element in the list.
*
* The first object passed to the match function is the current list item,
* followed by the user supplied data.
* If the supplied function returns TRUE this function returns SUCCESS, and
* the current object is returned in the third parameter, otherwise,
* the next item is checked.
*
* @warning Only use pointers as user supplied data.
*
* @param this calling object
* @param match comparison function to call on each object
* @param[out] item
* - the list item, if found
* - NULL, otherwise
* @param ... user data to supply to match function (limited to 5 arguments)
* @return
* - SUCCESS, if found
* - NOT_FOUND, otherwise
*/
status_t (*find_first) (linked_list_t *this, linked_list_match_t match, void **item, ...);
/** @brief Find the last matching element in the list.
*
* The first object passed to the match function is the current list item,
* followed by the user supplied data.
* If the supplied function returns TRUE this function returns SUCCESS, and
* the current object is returned in the third parameter, otherwise,
* the next item is checked.
*
* @warning Only use pointers as user supplied data.
*
* @param this calling object
* @param match comparison function to call on each object
* @param[out] item
* - the list item, if found
* - NULL, otherwise
* @param ... user data to supply to match function (limited to 5 arguments)
* @return
* - SUCCESS, if found
* - NOT_FOUND, otherwise
*/
status_t (*find_last) (linked_list_t *this, linked_list_match_t match, void **item, ...);
/**
* @brief Invoke a method on all of the contained objects.
*