func tooLarge(x int) bool {
	const max int = 1e6
	return x > max || x < -max
}

// parsenum converts ASCII to integer.  num is 0 (and isnum is false) if no number present.
func parsenum(s string, start, end int) (num int, isnum bool, newi int) {
	if start >= end {
		return 0, false, end
	}
	for newi = start; newi < end && '0' <= s[newi] && s[newi] <= '9'; newi++ {
		if tooLarge(num) {

    return BigInteger.ZERO.setBit(log2(x, FLOOR));
  }

  /** Returns {@code true} if {@code x} represents a power of two. */
  public static boolean isPowerOfTwo(BigInteger x) {
    checkNotNull(x);
    return x.signum() > 0 && x.getLowestSetBit() == x.bitLength() - 1;
  }

  /**
   * Returns the base-2 logarithm of {@code x}, rounded according to the specified rounding mode.
   *
   * @throws IllegalArgumentException if {@code x <= 0}

	SYS_FCHFLAGS                 = 35  // { int fchflags(int fd, u_long flags); }
	SYS_SYNC                     = 36  // { int sync(void); }
	SYS_KILL                     = 37  // { int kill(int pid, int signum); }
	SYS_GETPPID                  = 39  // { pid_t getppid(void); }
	SYS_DUP                      = 41  // { int dup(u_int fd); }
	SYS_PIPE                     = 42  // { int pipe(void); }

	SYS_FCHFLAGS                 = 35  // { int fchflags(int fd, u_long flags); }
	SYS_SYNC                     = 36  // { int sync(void); }
	SYS_KILL                     = 37  // { int kill(int pid, int signum); }
	SYS_GETPPID                  = 39  // { pid_t getppid(void); }
	SYS_DUP                      = 41  // { int dup(u_int fd); }
	SYS_GETEGID                  = 43  // { gid_t getegid(void); }

	SYS_FCHFLAGS                 = 35  // { int fchflags(int fd, u_long flags); }
	SYS_SYNC                     = 36  // { int sync(void); }
	SYS_KILL                     = 37  // { int kill(int pid, int signum); }
	SYS_GETPPID                  = 39  // { pid_t getppid(void); }
	SYS_DUP                      = 41  // { int dup(u_int fd); }
	SYS_GETEGID                  = 43  // { gid_t getegid(void); }

	SYS_CHFLAGS       = 34  // { int chflags(char *path, int flags); }
	SYS_FCHFLAGS      = 35  // { int fchflags(int fd, int flags); }
	SYS_SYNC          = 36  // { int sync(void); }
	SYS_KILL          = 37  // { int kill(int pid, int signum); }
	SYS_GETPPID       = 39  // { pid_t getppid(void); }
	SYS_DUP           = 41  // { int dup(u_int fd); }
	SYS_PIPE          = 42  // { int pipe(void); }
	SYS_GETEGID       = 43  // { gid_t getegid(void); }

//sysnb	Getrusage(who int, rusage *Rusage) (err error)
//sysnb	Getsid(pid int) (sid int, err error)
//sysnb	Gettimeofday(tv *Timeval) (err error)
//sysnb	Getuid() (uid int)
//sys	Issetugid() (tainted bool)
//sys	Kill(pid int, signum Signal) (err error)
//sys	Kqueue() (fd int, err error)
//sys	Lchown(path string, uid int, gid int) (err error)
//sys	Link(path string, link string) (err error)
//sys	Listen(s int, backlog int) (err error)

   *
   * @throws IllegalArgumentException if {@code value} is negative or {@code value >= 2^32}
   */
  public static UnsignedInteger valueOf(BigInteger value) {
    checkNotNull(value);
    checkArgument(
        value.signum() >= 0 && value.bitLength() <= Integer.SIZE,
        "value (%s) is outside the range for an unsigned integer value",
        value);
    return fromIntBits(value.intValue());
  }

  /**

   *
   * @throws IllegalArgumentException if {@code value} is negative or {@code value >= 2^32}
   */
  public static UnsignedInteger valueOf(BigInteger value) {
    checkNotNull(value);
    checkArgument(
        value.signum() >= 0 && value.bitLength() <= Integer.SIZE,
        "value (%s) is outside the range for an unsigned integer value",
        value);
    return fromIntBits(value.intValue());
  }

  /**

	SYS_FCHFLAGS                 = 35  // { int fchflags(int fd, u_long flags); }
	SYS_SYNC                     = 36  // { int sync(void); }
	SYS_KILL                     = 37  // { int kill(int pid, int signum); }
	SYS_GETPPID                  = 39  // { pid_t getppid(void); }
	SYS_DUP                      = 41  // { int dup(u_int fd); }
	SYS_PIPE                     = 42  // { int pipe(void); }