How do you write a function that can reverse a linked-list?

void reverselist(void)
{
if(head==0)
return;
if(head->next==0)
return;
if(head->next==tail)
{
head->next = 0;
tail->next = head;
} else
{
node* pre = head;
node* cur = head->next;
node* curnext = cur->next; head->next = 0; cur-> next = head;
for(; curnext !=0;)
{
cur->next = pre;
pre = cur;
cur = curnext;
curnext = curnext->next;
}
curnext->next = cur;
}
}