docs: @Override
    public void write(char[] cbuf, int off, int len) throws IOException {
      if(len <= 0) {
        return;
      }
      // if we havn't last seen a newline, and don't get a CR, insert a newline.
      if(charsSinceNewline > 0) {
        if(cbuf[off] != CARRIAGE_RETURN) {
          super.write(NEWLINEC, 0, NEWLINEC.length);
          charsSinceNewline = 0;
        }
        else {
          // length of this line:
          int nonnl = countNonNewline(cbuf, off + 1, len - 1);
          // clear the existing chars.
          if(nonnl < charsSinceNewline) {
            super.write(CARRIAGE_RETURN);
            while(charsSinceNewline > 0) {
              final int n = Math.min(charsSinceNewline, WHITESPACE.length());
              super.write(WHITESPACE, 0, n);
              charsSinceNewline -= n;
            }
          }
          else {
            charsSinceNewline = 0;
          }
        }
      }
      charsSinceNewline = tailingNonNewline(cbuf, off, len);
      super.write(cbuf, off, len);
      flush();
    }