server adding, updating fingertables done (errors resolved)

dns.cpp

@@ -72,9 +72,37 @@ public:
                 getAddressResponder.Finish(info,Status::OK,this);
             }
             else if(reqType==ADDADDRESS){
+                ifstream fin;
+                fin.open(SERVERS);
+                int size=0;
+                map<int,string> svs;
+                do {
+                    string temp;
+                    getline(fin,temp);
+                    if(temp.size()==0)
+                        break;
+                    svs[size++]=temp;
+                } while(fin);
+                fin.close();
+                string addresses[size+1];
+                int count=0;
+                string addtoadd=info.address();
+                int porttoadd=stoi(addtoadd.substr(addtoadd.find(':')+1));
+                bool flag=false;
+                for(int i=0;i<size;i++) {
+                    int curr_port=stoi(svs[i].substr(svs[i].find(':')+1));
+                    if(porttoadd<curr_port&&flag==false) {
+                        addresses[count++]=addtoadd;
+                        flag=true;
+                    }
+                    addresses[count++]=svs[i];
+                }
+                if(flag==false)
+                    addresses[count++]=addtoadd;
                 ofstream fout;
-                fout.open(SERVERS,ios::app);
-                fout<<info.address()<<endl;
+                fout.open(SERVERS);
+                for(int i=0;i<count;i++)
+                    fout<<addresses[i]<<endl;
                 fout.close();
                 null.set_nothing(0);
                 cout<<info.address()<<endl;