[clang] [clang][analyzer] Add checker 'unix.cstring.MissingTerminatingZero' (PR #146664)

[Donát Nagy via cfe-commits]

https://github.com/NagyDonat commented:

As an initial review I added some high-level remarks. I will dig into the technical details once these are discussed and answered.

https://github.com/llvm/llvm-project/pull/146664