rem: const char *msg; if (argc - optind < 2) msg = _("too few arguments"); else if (argc - optind > 4) msg = _("too many arguments");
add: if (argc <= optind) error (0, 0, _("missing operand"));
context: main (int argc, char **argv){  mode_t newmode;  struct mode_change *change;  const char *specified_mode;  int optc;  mode_t node_type;  program_name = argv[0];  setlocale (LC_ALL, "");  bindtextdomain (PACKAGE, LOCALEDIR);  textdomain (PACKAGE);  atexit (close_stdout);  specified_mode = NULL;  while ((optc = getopt_long (argc, argv, "m:", longopts, NULL)) != -1)    {      switch (optc)	{	case 0:	  break;	case 'm':	  specified_mode = optarg;	  break;	case_GETOPT_HELP_CHAR;	case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);	default:	  usage (EXIT_FAILURE);	}    }  newmode = (S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);  if (specified_mode)    {      newmode &= ~ umask (0);      change = mode_compile (specified_mode, 0);      if (change == MODE_INVALID)	error (EXIT_FAILURE, 0, _("invalid mode"));      else if (change == MODE_MEMORY_EXHAUSTED)	xalloc_die ();      newmode = mode_adjust (newmode, change);    }  if (argc - optind != 2 && argc - optind != 4)    {      const char *msg;      if (argc - optind < 2)	msg = _("too few arguments");      else if (argc - optind > 4)	msg = _("too many arguments");      else	msg = _("wrong number of arguments");      error (0, 0, "%s", msg);      usage (EXIT_FAILURE);    }  /* Only check the first character, to allow mnemonic usage like     `mknod /dev/rst0 character 18 0'. */  switch (argv[optind + 1][0])    {    case 'b':			/* `block' or `buffered' */#ifndef S_IFBLK      error (4, 0, _("block special files not supported"));#else      node_type = S_IFBLK;#endif      goto block_or_character;    case 'c':			/* `character' */    case 'u':			/* `unbuffered' */#ifndef S_IFCHR      error (4, 0, _("character special files not supported"));#else      node_type = S_IFCHR;#endif      goto block_or_character;    block_or_character:      if (argc - optind != 4)	{	  error (0, 0, _("\when creating special files, major and minor device\n\numbers must be specified"));	  usage (EXIT_FAILURE);	}      {	char const *s_major = argv[optind + 2];	char const *s_minor = argv[optind + 3];	uintmax_t i_major, i_minor;	dev_t device;	if (xstrtoumax (s_major, NULL, 0, &i_major, NULL) != LONGINT_OK	    || i_major != (major_t) i_major)	  error (EXIT_FAILURE, 0,		 _("invalid major device number %s"), quote (s_major));	if (xstrtoumax (s_minor, NULL, 0, &i_minor, NULL) != LONGINT_OK	    || i_minor != (minor_t) i_minor)	  error (EXIT_FAILURE, 0,		 _("invalid minor device number %s"), quote (s_minor));	device = makedev (i_major, i_minor);#ifdef NODEV	if (device == NODEV)	  error (EXIT_FAILURE, 0, _("invalid device %s %s"), s_major, s_minor);#endif	if (mknod (argv[optind], newmode | node_type, device) != 0)	  error (EXIT_FAILURE, errno, "%s", quote (argv[optind]));      }      break;    case 'p':			/* `pipe' */#ifndef S_ISFIFO      error (4, 0, _("fifo files not supported"));#else      if (argc - optind != 2)	{	  error (0, 0, _("\major and minor device numbers may not be specified for fifo files"));	  usage (EXIT_FAILURE);	}      if (mkfifo (argv[optind], newmode))	error (EXIT_FAILURE, errno, "%s", quote (argv[optind]));#endif      break;    default:      error (0, 0, "invalid device type %s", quote (argv[optind + 1]));      usage (EXIT_FAILURE);    }  /* Perform an explicit chmod to ensure the file mode permission bits     are set as specified.  This extra step is necessary in some cases     when the containing directory has a default ACL.  */  if (specified_mode)    {      if (chmod (argv[optind], newmode))        error (0, errno, _("cannot set permissions of %s"),               quote (argv[optind]));    }  exit (EXIT_SUCCESS);}