#5396: rare segfault in a terminal game
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Reporter: MikolajKonarski | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler
Version: 7.3 | Keywords:
Testcase: | Blockedby:
Os: Linux | Blocking:
Architecture: x86_64 (amd64) | Failure: Runtime crash
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Comment(by MikolajKonarski):
Another relevant line
https://github.com/coreyoconnor/vty/blob/master/src/Codec/Binary/UTF8/Width.hs#L31
BTW, I'm perplexed, because the comment in
http://hackage.haskell.org/packages/archive/base/latest/doc/html/src/Foreign-C-String.html#withCWStringLen
says the string is "NUL terminated", but it's not terminated with anything
extra --- there are just the converted characters put into an array.
If I'm right, things can segfault a lot, e.g., with empty strings that
don't get any C array allocated. A workaround for this in vty would be to
change the order of arguments of conjunction in
https://github.com/coreyoconnor/vty/blob/master/cbits/mk_wcwidth.c#L211
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5396#comment:2>
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