#include <stdio.h>             
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>


#define SERVER_PORT 1966
#define MAX_LINE 256

int main( int argc, char * argv[] )
{
   struct hostent *hp;          
   struct sockaddr_in sin;
   char* host;
   char buf[MAX_LINE];
   int s;
   int len;

   if ( argc == 2)
   {
        host = argv[1];                 //hands host name to client
   }
   else
   {
      fprintf(stderr, "usage:simplex-talk host\n");
      exit(1);
   }
  
   /*translate host name into peer's address */
   hp = gethostbyname( host );           //returns a pointer to struct hostent
  
   if( !hp )
   {
        fprintf( stderr, "simplex-talk: unknown host: %s\n", host );
        exit (1);
   }


   /*builds address data structure */
   bzero( (char*)& sin, sizeof(sin) );
   sin.sin_family = AF_INET;
   bcopy( hp->h_addr, (char*)&sin.sin_addr, hp->h_length );
   sin.sin_port = htons( SERVER_PORT );


   /* client performs an active open */
   if( (s = socket(PF_INET, SOCK_STREAM, 0)) < 0 )
   {
        perror( "simplex-talk: socket" );
        exit(1);
   }
   
   /*and then connects*/
   if( connect(s, (struct sockaddr*)& sin, sizeof(sin)) < 0 )
   {
        perror( "simplex-talk: connect" );
        close(s);
        exit(1);
   }



   /* main loop: get and send lines of text */
   fputs( "Enter text to send:\n ", stdout );


   while( fgets(buf, sizeof(buf), stdin) )  // fgets() retrieves  the users input into buf
   {
        buf[MAX_LINE-1] = '\0';
        len = strlen(buf) + 1;
        send( s, buf, len, 0 );

   }
} //end main.