over the place by snprintf() to avoid integer overflow.

* sample/svr.rb: service can be stopped by ill-behaved client; use
  tsvr.rb instead.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8@8799 b2dd03c8-39d4-4d8f-98ff-823fe69b080e