if (ISSPACE (*s) || is_special (*s))
if (ISSPACE ((unsigned char) *s) || is_special (*s))
next_token (const char *s, char *token, size_t *tokenlen, size_t tokenmax){  if (*s == '(')    return (parse_comment (s + 1, token, tokenlen, tokenmax));  if (*s == '"')    return (parse_quote (s + 1, token, tokenlen, tokenmax));  if (is_special (*s))  {    if (*tokenlen < tokenmax)      token[(*tokenlen)++] = *s;    return (s + 1);  }  while (*s)  {    if (ISSPACE (*s) || is_special (*s))      break;    if (*tokenlen < tokenmax)      token[(*tokenlen)++] = *s;    s++;  }  return s;}