list_iterator.c

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#include "list_functions.h"
 
 
ListIterator *create_list_iterator(List *list) {
    if (!list)
        return NULL;
 
    ListIterator *new_iterator = malloc(sizeof(ListIterator));
    new_iterator->list = list;
    new_iterator->curr = new_iterator->list->head;
    new_iterator->index = 0;
    return new_iterator;
}
 
 
void *get_current_list_iterator_element(ListIterator *iterator) {
    return (iterator && iterator->curr && iterator->curr->value) ? iterator->curr->value : NULL;
}
 
 
bool is_list_iterator_valid(ListIterator *iterator) {
    return (iterator) ? iterator->index < get_list_size(iterator->list) : 0;
}
 
 
void list_iterator_next(ListIterator *iterator) {
    if (is_list_iterator_valid(iterator)) {
        iterator->index++;
 
        if (is_list_iterator_valid(iterator)) {
            iterator->curr = iterator->curr->next;
        }
    }
}
 
 
void delete_list_iterator(ListIterator *iterator) {
    free(iterator);
}
 
 
void *list_iterator_get_next(ListIterator *iterator) {
    if (!is_list_iterator_valid(iterator)) {
        return NULL;
    }
 
    void *element = get_current_list_iterator_element(iterator);
    list_iterator_next(iterator);
    return element;
}