#include <sys/types.h>
#include <sys/wait.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <netdb.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define SERVER_PORT 1234
#define QUEUE_SIZE 5

int main(int argc, char* argv[])
{
   int server_socket_descriptor;
   int connection_socket_descriptor;
   int bind_result;
   int listen_result;
   char reuse_addr_val = 1;
   char buf[100];
   char l1[50];
   char l2[50];
   char toSend[100];
   char * l;

   struct sockaddr_in server_address;

   //inicjalizacja gniazda serwera

   memset(&server_address, 0, sizeof(struct sockaddr));
   server_address.sin_family = AF_INET;
   server_address.sin_addr.s_addr = htonl(INADDR_ANY);
   server_address.sin_port = htons(SERVER_PORT);

   server_socket_descriptor = socket(AF_INET, SOCK_STREAM, 0);
   if (server_socket_descriptor < 0)
   {
       fprintf(stderr, "%s: Błąd przy próbie utworzenia gniazda..\n", argv[0]);
       exit(1);
   }
   setsockopt(server_socket_descriptor, SOL_SOCKET, SO_REUSEADDR, (char*)&reuse_addr_val, sizeof(reuse_addr_val));

   bind_result = bind(server_socket_descriptor, (struct sockaddr*)&server_address, sizeof(struct sockaddr));
   if (bind_result < 0)
   {
       fprintf(stderr, "%s: Błąd przy próbie dowiązania adresu IP i numeru portu do gniazda.\n", argv[0]);
       exit(1);
   }

   listen_result = listen(server_socket_descriptor, QUEUE_SIZE);
   if (listen_result < 0) {
       fprintf(stderr, "%s: Błąd przy próbie ustawienia wielkości kolejki.\n", argv[0]);
       exit(1);
   }

   while(1)
   {
       if((connection_socket_descriptor = accept(server_socket_descriptor, NULL, NULL))!=-1){
            while(read(connection_socket_descriptor, buf, sizeof(buf)>0)){}
            l=l1;
            int x=0;
            for(int i=0; i<sizeof(buf); i++){
                if(buf[i]==';') {l=l2; x=0;}
                l[x]=buf[i];
                x++;
            }

            int ll1, ll2;
            int suma;

            sscanf(l1, "%d", &ll1);
            sscanf(l2, "%d", &ll2);

            suma=ll1+ll2;

            sprintf(toSend, "%d", suma);

            write(connection_socket_descriptor, toSend, sizeof(toSend));
            printf("%s\n", toSend);
       }
   }

   close(server_socket_descriptor);
   return(0);
}