scan (REXML::IOSource)

    # File rexml/source.rb, line 179
      def scan pattern, consume=false
    			rv = super
    			# You'll notice that this next section is very similar to the same
    			# section in match(), but just a liiittle different.  This is
    			# because it is a touch faster to do it this way with scan()
    			# than the way match() does it; enough faster to warrent duplicating
    			# some code
    			if rv.size == 0
    				until @buffer =~ pattern or @source.nil?
    					begin
    						#str = @source.read(@block_size)
    						str = @source.readline('>')
    						str = encode(str) if str and @to_utf
    						@buffer << str
    					rescue
    						@source = nil
    					end
    				end
    				rv = super
    			end
    			rv.taint
    			rv
    		end