Convert a double to long in ANSI C (Java's doubleToRawLongBits)

doubleToRawLongBits.c

// Make sure that unsigned long is 8 bytes of length

unsigned long utilDoubleToLong(double value) {
  unsigned long longValue;
  memcpy(&longValue, &value, sizeof(unsigned long));
  return longValue;
}

double utilLongToDouble(unsigned long value) {
  double doubleValue;
  memcpy(&doubleValue, &value, sizeof(unsigned long));
  return doubleValue;
}