Bugzilla Bug 298612: ensure that the return value of StringGetChar, which is passed to isspace, etc., is EOF or between 0 and 255. r=darin.
Bugzilla Bug 298612: ensure that the return value of StringGetChar, which
is passed to isspace, etc., is EOF or between 0 and 255. r=darin.

makotokato/nsprpub,makotokato/nsprpub,makotokato/nsprpub,makotokato/nsprpub,makotokato/nsprpub