code: public final int rightAdjustCharHead(byte[]bytes, int p, int s, int end) {
          int p_ = leftAdjustCharHead(bytes, p, s, end);
          if (p_ < s) p_ += length(bytes, p_, end);
          return p_;
      }
docs: /* onigenc_get_right_adjust_char_head / ONIGENC_LEFT_ADJUST_CHAR_HEAD