simple tcp client

 /*
 * Most of the code is from http://www.paulgriffiths.net/program/c/srcs/echoclntsrc.html
 *
 */

/* Just included everything possible .. dont think it makes a difference to the code */
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <syslog.h>
#include <netdb.h>
#include <string.h>
#include <ctype.h>
#include <pwd.h>
#include <regex.h>
#include <sys/time.h>
#include  <signal.h>
#include <unistd.h>
#include <arpa/inet.h>
#define BOUNCEHOST "127.0.0.1"
#define BOUNCEPORT   1601
#define MAX_LINE 1000



/*  Write a line to a socket  */
ssize_t Writeline(int sockd, const void *vptr, size_t n) {
  size_t      nleft;
  ssize_t     nwritten;
  const char *buffer;

  buffer = vptr;
  nleft  = n;


 while ( nleft > 0 ) {
    if ( (nwritten = write(sockd, buffer, nleft)) <= 0 ) {
      if ( errno == EINTR )
        nwritten = 0;
      else
        return -1;
    }
    nleft  -= nwritten;
    buffer += nwritten;
  }

  return n;
}







int main(int argc, char* argv[]) {
  int       conn_s;
  struct    sockaddr_in servaddr;
  char      buffer[MAX_LINE];

  if (argc != 3) {
    fprintf(stderr, "Incorrect usage\n");
    exit(1);
  }
  if ( (conn_s = socket(AF_INET, SOCK_STREAM, 0)) < 0 ) {
    fprintf(stderr, "ECHOCLNT: Error creating listening socket.\n");
    exit(EXIT_FAILURE);
  }
  memset(&servaddr, 0, sizeof(servaddr));
  servaddr.sin_family      = AF_INET;
  servaddr.sin_port        = htons(BOUNCEPORT);
  if ( inet_aton(BOUNCEHOST, &servaddr.sin_addr) <= 0 ) {
    printf("ECHOCLNT: Invalid remote IP address.\n");
    exit(EXIT_FAILURE);
  }
  if ( connect(conn_s, (struct sockaddr *) &servaddr, sizeof(servaddr) ) < 0 ) {
    printf("ECHOCLNT: Error calling connect()\n");
    exit(EXIT_FAILURE);
  }
  while(fgets(buffer,MAX_LINE,stdin)) Writeline(conn_s, buffer, strlen(buffer));

  exit(0);

}