Re: luajit string to char * conversion
- From: Wolfgang Pupp <wolfgang.pupp@xxxxxxxxx>
- To: luajit@xxxxxxxxxxxxx
- Date: Thu, 27 Nov 2014 12:03:14 +0100
Note that you *must* compare with nil for NULL-pointer checks.
If you coerce cdata to boolean type (e.g. by if-condition), you always
get <true>. Example:
local v = ffi.new'char *'
if v == nil then
print "this is working as intended"
end
-- this probably doesn't do what you think it does.
-- Even NULL-pointer cdata (which compares equal to nil, see above),
-- satisfies an if-condition (-> surprise segfault in this case):
if v then
print "surprise segfault!"
nullptr[0] = 0
end
--Wolfgang
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