# File lib/celluloid/io/stream.rb, line 87 def read(size=nil, buf=nil) if size == 0 if buf buf.clear return buf else return "" end end until @eof break if size && size <= @read_buffer.size fill_rbuff break unless size end ret = consume_rbuff(size) || "" if buf buf.replace(ret) ret = buf end (size && ret.empty?) ? nil : ret end