Don't assume char is signed:
  http://www.ptt.cc/bbs/PttCurrent/M.1407332438.A.4FE.html


git-svn-id: http://opensvn.csie.org/pttbbs/trunk@6033 63ad8ddf-47c3-0310-b6dd-a9e9d9715204
Don't assume char is always signed
  http://www.ptt.cc/bbs/PttCurrent/M.1407332438.A.4FE.html


git-svn-id: http://opensvn.csie.org/pttbbs/trunk@6034 63ad8ddf-47c3-0310-b6dd-a9e9d9715204