void *ListIteratorData(const ListIterator *iterator)
{
if (!iterator)
{
return NULL;
}
if (IsIteratorValid(iterator))
{
// The list has moved forward, the iterator is invalid now
return NULL;
}
return iterator->current->payload;
}
int ListIteratorLast(ListIterator *iterator)
{
if (!iterator)
{
return -1;
}
if (IsIteratorValid(iterator))
{
// The list has moved forward, the iterator is invalid now
return -1;
}
iterator->current = iterator->origin->last;
return 0;
}
bool ListIteratorHasPrevious(const ListIterator *iterator)
{
if (!iterator)
{
return false;
}
if (IsIteratorValid(iterator))
{
// The list has moved forward, the iterator is invalid now
return false;
}
if (iterator->current->previous)
{
return true;
}
return false;
}
int ListIteratorPrevious(ListIterator *iterator)
{
if (!iterator)
{
return -1;
}
if (IsIteratorValid(iterator))
{
// The list has moved forward, the iterator is invalid now
return -1;
}
// Ok, check if we are at the end
if (iterator->current && iterator->current->previous)
{
iterator->current = iterator->current->previous;
}
else
{
return -1;
}
return 0;
}
