buffering.rb do_write that handles different encodings

gistfile1.rb

##
# Writes +s+ to the buffer.  When the buffer is full or #sync is true the
# buffer is flushed to the underlying socket.

def do_write(s)
  @wbuffer = "" unless defined? @wbuffer
  @wbuffer << s
  @sync ||= false
  if @sync or @wbuffer.bytesize > BLOCK_SIZE or idx = @wbuffer.rindex($/)
    remain = idx ? idx + $/.size : @wbuffer.bytesize
    nwritten = 0
    while remain > 0
      str = @wbuffer.byteslice(nwritten,remain)
      begin
        nwrote = syswrite(str)
      rescue Errno::EAGAIN
        retry
      end
      remain -= nwrote
      nwritten += nwrote
    end
    @wbuffer = @wbuffer.byteslice(nwritten, @wbuffer.bytesize - nwritten)
  end
end

public

##
# Writes +s+ to the stream.  If the argument is not a string it will be
# converted using String#to_s.  Returns the number of bytes written.

def write(s)
  do_write(s)
  s.bytesize
end