time.c (zone_str): while rb_fstring_usascii and the family require that the argument string is never modified, tzname may point areas which will be discarded by calling tzset(). make a String then call rb_fstring to copy the zone name. when an ID equals TZ environment variable, its name string also has modified by changing tzname.
Added by nobu (Nobuyoshi Nakada) about 7 years ago
Fix overwritten zone string
require that the argument string is never modified, tzname may
point areas which will be discarded by calling tzset().
make a String then call rb_fstring to copy the zone name.
when an ID equals TZ environment variable, its name string also
has modified by changing tzname.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@65035 b2dd03c8-39d4-4d8f-98ff-823fe69b080e