filehandler.rb: revert r20152
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@40847 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
filehandler.rb: revert r20152
partially and fix misuse of bytesize and regexp repetition operator.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@40847 b2dd03c8-39d4-4d8f-98ff-823fe69b080e