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

#define BSZ 25
#define EPORT 7

int makeConnect(char *);
void chomp(char *);
int iseofhere(char *);
void addeof(char *);


int main(int argc , char **argv) {
int s, err, p = 0;
char sbuf[BSZ];
char rbuf[BSZ];

                     if (argc != 2) {printf("Please provide a host ip address for connect().\n"); return 1;}
                     srand(time(NULL));
                     if ( (s = makeConnect(argv[1])) <= 0) {
                          perror("makeconnect()");
                          return 1;
                     }

                     bzero(sbuf,BSZ);
                     while (1) {
                               printf("\nSend string through descriptor %d: ",s);
                               fgets(sbuf,BSZ,stdin);
                               if (strcmp(sbuf,"quit\n") == 0) {close(s); break;}
                               if ((p++) % 3 == 0) {addeof(sbuf);}
                               if ( (err = send(s,sbuf,BSZ,0)) <= 0) {perror("send()"); continue;}
                               if ( (err = recv(s,rbuf,BSZ,0)) <= 0) {perror("recv()"); continue;}
                               if (iseofhere(sbuf) || iseofhere(rbuf)) {printf("Detected eof.\n");}
                               chomp(sbuf); chomp(rbuf);
                               printf("Sent buffer %s and received buffer %s\n",sbuf,rbuf);
                     }
return 0;
}               

void addeof(char *dta) {
int p = strlen(dta);
                        dta[(int)(1 + rand() %  p)] = EOF;
}

int iseofhere(char *dta) {
                         for ( ; *dta != '\0' ; dta++) {
                             if (*dta == EOF) {return 1;}
                          }
                          return 0;
}  

void chomp(char *dta) {

                      for ( ; *dta != '\n' && *dta != '\0'; dta++) {;}
                      *dta = '\0';
}

                           
int makeConnect(char *addr) {
int sck = -1;
in_addr_t valid_add;
struct sockaddr_in info;

                             bzero(&info,sizeof(info));
                             if ( (valid_add = inet_addr(addr)) < 0) {return sck;}
                             if ( (sck = socket(PF_INET,SOCK_STREAM,0)) < 0) {return sck;}

                             info.sin_port = htons(EPORT);
                             info.sin_addr.s_addr = valid_add;
                             info.sin_family = PF_INET;
                            
                             if (connect(sck,(struct sockaddr *)&info,sizeof(info)) < 0) {
                                 close(sck);
                                 return -1;
                             }
                             return sck;
}