#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
int main(int argc, char **argv) {
  if (argc != 2) {
    fprintf(stderr, "Wrong argument count!\n");
    return 1;
  }

  int fd = open(argv[1], O_RDONLY);
  if (fd == -1) {
    perror("Opening the file failed");
    return 1;
  }

  int filesize = lseek(fd, 0, SEEK_END);

  char buf[256];
  printf("The file has %d bytes.\nThe last %d bytes are:\n",
         filesize, filesize < 16 ? filesize : 16);
  fflush(stdout);

  if (filesize < 16)
    lseek(fd, 0, SEEK_SET);
  else
    lseek(fd, -16, SEEK_CUR);

  int cnt = read(fd, buf, 16);
  close(fd);

  write(1, buf, cnt);

  return 0;
}