/* unixechoclient.c - Communicate with the unixechoserver
       through a Unix socket associated with a file pathname 
       [passed either as argv[1] or by default /tmp/unixechoserver]
       In a loop the user is prompted to enter a line of text
       and this data is sent to the server; the reply (echo) is printed
       out. The loop terminates when we enter a null line.
 */

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

char unixecho_path[256] = "/tmp/unixechoserver"; /* default */


int
main(int argc, char **argv)
{
  int			sockfd;
  struct sockaddr_un	servaddr;
  
  if ( (sockfd = socket(AF_UNIX, SOCK_STREAM, 0) ) < 0 ) {
    perror("Socket");
    exit (1);
  }
  
  bzero((void *)&servaddr, sizeof(servaddr));
  servaddr.sun_family = AF_UNIX;
  strcpy(servaddr.sun_path, unixecho_path);
  
  if ( connect(sockfd, (struct sockaddr *) &servaddr, sizeof(servaddr)) < 0 ) {
    perror("Connect");
    exit (1);
  }
  
  for ( ; ; ) {
    int n;
    char c;

    /* Read a line from user and write it to socket */
    n = 0;
    printf("Enter a line: ");
    for (;;) {
      c = getchar();
      write(sockfd, &c, 1);
      if (c == '\n') break;
      n++;
    }
    /* Read a line from the socket */
    for (;;) {
      read(sockfd, &c, 1);
      putchar(c);
      if (c == '\n') break;
    }
    if (n == 0) break; /* The line entered by user was null */
  }

  exit(0);
}