Less basic use of unveil

Consider OpenBSD's nc(1) command:
  -Network swiss army knife.. many sharp blades.
  -Blade to use chosen by alphabet soup command line args.
  
if (usetls) {
  if (Cflag && unveil(Cflag, "r") == -1)
    err(1, "unveil");
  if (unveil(Rflag, "r") == -1)
      err(1, "unveil");
  if (Kflag && unveil(Kflag, "r") == -1)
      err(1, "unveil");
  if (oflag && unveil(oflag, "r") == -1)
      err(1, "unveil");
} else {
  if (family == AF_UNIX) {
    if (unveil(host, "rwc") == -1)
      err(1, "unveil");
    if (uflag && !lflag) {
        if (unveil(sflag ? sflag : "/tmp", "rwc") == -1)
          err(1, "unveil");
    }
  } else {
    if (unveil("/", "") == -1)
      err(1, "unveil");
  }
}

We have a different unveil for each "blade" of the knife.