circular header linked list

Where is the mistake

void add(int item)

{ node*p=new node;

p->info=item;

node*per=head;

for(node*curr=head->next;curr!=head;curr=curr->next){

per=curr;

per=per->next;

curr->next=p;

p->next=per; }

{

if(head->next==head){

p->next=head;

head->next=p;}

}

}

1- void add (int item); This function inserts a new node after the first node (when the list is empty, the inserted node will be the first node)