string_new_printf

char * string_new_printf (char * format, ...) {
  char tmp_str[_STR_MAX_LEN];
  char * ret_val;
  va_list args;
  size_t str_len;

  av_start (args, format);
  str_len = snprintf (tmp_str, _STR_MAX_LEN, format, args);
  av_end (args);

  if (str_len < 0) {
    return NULL;
  }

  ret_val = malloc ((str_len + 1) * sizeof (char)));
  memcpy (ret_val, tmp_str, (str_len + 1) * sizeof (char));

  free (tmp_str);

  return ret_val;
}