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Added list_remove_at function ...

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... that removes the list element at the given index.
This commit is contained in:
Walter Julius Hennecke 2013-04-14 22:54:40 +02:00
parent b561fedc85
commit b9d5d99f00
2 changed files with 61 additions and 0 deletions
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60
code/game/list.c
View file

@ -431,6 +431,64 @@ static void list_remove(list_p list, char end) {
}
}
/**
* Function for completely destroying an item in the list at a given index.
*
* \param list pointer to a list
* \param idx index of the element to remove
*/
static void list_remove_at(list_p list, int idx) {
container_p cont;
list_iter_p iter;
lnode_p target = NULL;
int i;
if(idx < 0 || idx >= list->length || list->length == 0) {
return;
}
iter = list_iterator(list, LIST_FRONT);
for(cont = list_next(iter), i = 0; cont != NULL; cont = list_next(iter), i++) {
if(i == idx) {
target = iter->current;
break;
}
}
destroy_iterator(iter);
if(target == NULL) {
return;
}
if(list->length == 1) {
list->first = list->last = NULL;
list->length--;
free(target);
} else {
target->prev->next = target->next;
target->next->prev = target->prev;
if(target == list->first) {
list->first = target->next;
}
if(target == list->last) {
list->last = target->prev;
}
list->length--;
free(target);
}
if(cont != NULL) {
if(cont->pointer == 0 && cont->data != NULL) {
list->destructor(cont->data);
}
free(cont);
}
}
void destroy_list(list_p list) {
lnode_p cur = list->first;
lnode_p next;
@ -524,6 +582,7 @@ list_p create_list() {
list->prepend_ptr = list_prepend_ptr;
list->prev = list_prev;
list->remove = list_remove;
list->removeAt = list_remove_at;
return list;
}
@ -550,5 +609,6 @@ void list_init(struct list * l, void (*destructor)(void*)) {
l->prepend_ptr = list_prepend_ptr;
l->prev = list_prev;
l->remove = list_remove;
l->removeAt = list_remove_at;
}

1
code/game/list.h
View file

@ -118,6 +118,7 @@ struct list{
container_p (*poll)(list_p list); /*<! poll */
container_p (*pop)(list_p list); /*<! pop */
void (*remove)(list_p list, char end); /*!< remove an element from the list */
void (*removeAt)(list_p list, int idx); /*!< remove an element at a specified index */
};
/**