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size_t count_whitespace(char const *s, size_t length) {
  char const *t = s;

  /* possibly *t < 0 */
  while (isspace(*t) && (t - s < length))  /* possibly *t < 0 */
    ++t;
  return t - s;
}

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

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