Buffers until size limit is reached

buffering_until

for line in file:
            stripped_line = line.strip()
            lines_buffer.append(line)
            if last_element_close in stripped_line:
                size += len(line.encode('utf-8'))
               
                if size > size_limit:
                    output_file = os.path.join(output_dir, f"{output_file_prefix}_{file_number}.xml")
                    with open(output_file, 'w', encoding='utf-8') as out_file:
                        out_file.write(header)
                        write_buffered_lines(out_file, lines_buffer)
                        out_file.write(footer)
                    print(f"arquivo {file_number}: {output_dir}:{output_file_prefix}_{file_number}.xml")

                    file_number += 1
                    size = 0
                    lines_buffer = []