How to choose a item from a list randomly ?

random select in a list

//only iterator the list once, but call the random function n times.
int count = 0;
Node *head = list_head();
int value;
for (p = head; p; p = p->next) {
  if (random() % ++count == 0) {
    value = p->data;
  }
}
return value;