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size_t count_whitespace(char const char *s) {
  char const char *t = s;
  while (isspace(*t))  /* possibly *t < 0 */
    ++t;
  return t - s;
}

size_t count_whitespace(const unsigned *s) {
  const unsigned char *t = s;
  while (isspace(*t))
    ++t;
  return t - s;
}

size_t count_whitespace(char const char *s) {
  char const char *t = s;
  while (isspace((unsigned char)*t))
    ++t;
  return t - s;
}