xmlparse.c: Deny internal entities closing the doctype
ENTROPY_DEBUG(const char *label, unsigned long entropy) {
  const char *const EXPAT_ENTROPY_DEBUG = getenv("EXPAT_ENTROPY_DEBUG");
  if (EXPAT_ENTROPY_DEBUG && ! strcmp(EXPAT_ENTROPY_DEBUG, "1")) {
    fprintf(stderr, "Entropy: %s --> 0x%0*lx (%lu bytes)\n", label,
            (int)sizeof(entropy) * 2, entropy, (unsigned long)sizeof(entropy));
  }
  return entropy;
}

ENTROPY_DEBUG(const char *label, unsigned long entropy) {
  const char *const EXPAT_ENTROPY_DEBUG = getenv("EXPAT_ENTROPY_DEBUG");
  if (EXPAT_ENTROPY_DEBUG && ! strcmp(EXPAT_ENTROPY_DEBUG, "1")) {
    fprintf(stderr, "Entropy: %s --> 0x%0*lx (%lu bytes)\n", label,
            (int)sizeof(entropy) * 2, entropy, (unsigned long)sizeof(entropy));
  }
  return entropy;
}
