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#include <iostream>#include <cstdlib>#include <sys/socket.h>#include <arpa/inet.h>#include <unistd.h>#include <netinet/in.h>#include <netdb.h>#define size 45#define buf_size 4096using namespace std;class client{   public:      void prisijungti(char *c, int port);      char * ns(char *addr);      void die(char *msg);      void quit(char *msg);      void user(char *nick, char *usr, char *name);      int parse(int msg);      int rasti(char *c);      int fill(char *c, char *d);   private:     int sock;};void client::prisijungti(char *c, int port){   struct sockaddr_in ircsrv;   unsigned int srvlen;   if ((sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) die("failed to create socket");   memset(&ircsrv, 0, sizeof(ircsrv));   ircsrv.sin_family = 	AF_INET;   ircsrv.sin_addr.s_addr = inet_addr(ns(c));   ircsrv.sin_port = htons(port);   if (connect(sock, (struct sockaddr *) &ircsrv, sizeof(ircsrv)) < 0) die("failed connect to server");}char * client::ns(char *addr){   struct hostent *host;   struct in_addr h_addr;   if ((host = gethostbyname(addr)) == NULL) die("Can't get hostname");   h_addr.s_addr = *( (unsigned long *) host-> h_addr_list[0] );   return (inet_ntoa(h_addr));}void client::die(char *msg){    perror(msg); exit(1);}void client::quit(char *msg){ int len=0; char *sent = (char *) malloc(sizeof(char) * size); strcpy(sent,"QUIT :"); strcat(sent,msg); strcat(sent, "\n"); len = strlen(sent); if (send(sock, sent, len,0) != len) die("send error");}void client::user(char *nick, char *usr, char *name){   int len=0;   char *cmd = (char *) malloc(sizeof(char) * size);   char *cmd1 = (char *) malloc(sizeof(char) * size);   strcpy(cmd, "NICK "); strcat(cmd,nick );strcat(cmd, " \r\n");   strcpy(cmd1, "USER "); strcat(cmd1,usr); strcat(cmd1," \"test\" \"test\" :"); strcat(cmd1,name);   strcat(cmd1, "\r\n");   len = strlen(cmd);   if (send(sock, cmd, len,0) != len) die("send error");   len = strlen(cmd1);   if (send(sock, cmd1, len,0) != len) die("send error");}int client::fill(char *c, char *d){  int i=0; int j=0;  while (c[i] != ':' && c[i] != '\0') i++;  if (c[i] == ':')   {      i++;      while (c[i] != '\0')         {           d[j] = c[i];           i++; j++;         }    d[j] = '\0';    return 1;   }   return 0;}int client::parse(int msg){   int bytes=0;   int tmp=0;   string buffer;   string s, p;   char tmpc[4096], sent[100];   int j=0, len=0;    for (;;)    {      bytes = 0;      if ((bytes = recv(sock, tmpc , 4095, 0)) < 1) die("failed recieve bytes form server");       if (bytes > 0)        {          tmpc[bytes] = 0;          buffer += tmpc;          if (msg == 1)              cout << buffer;          if (buffer.find("PING :") != string::npos)           {             s = buffer.substr(buffer.find(":"),buffer.find("\r"));             p = p + "PONG " + s + "\r\n";             for (j=0; j < p.length() && j < sizeof(sent); j++)                sent[j] = p[j];             len = strlen(sent);             if (send(sock, sent, len,0) != len) die("send error");             for (j=0; j < sizeof(sent); j++)             sent[j] = ' ';             p="";           }          }      buffer= "";      for (j=0; j < 4096; j++)         tmpc[j] = ' ';    }}int client::rasti(char *c){   char * p = (char *) malloc(sizeof(char) * 4);   int i=0; int j=0; int t=0;   strcpy(p, "PING");   while (c[i] != '\0')     {        t = 0;        while (c[i] == p[j])           {             t++; j++; i++;           }         if (t== 4)            {            free(p);            return t;            }        j = 0;         i++;     }    return 0;}