Writing correct C is hard, so I’m not going to knock anyone who found stuff that helps them.
But pound defining shit to things you know via your Hungarian notion? Write some elisp. My Haskell programs don’t actually have Unicode lambda in them.
Pascal strings? Yeah, that’s probably the better call, but why not use C++ or Rust or something where a bunch of geniuses got it right already?
I'll be diving into C fairly heavy for the first time ever next year. I intend to skip right past pascal strings and implement/use free pascal's AnsiString or UnicodeString, both of which are reference counted, have a length (with no limit) and are guaranteed null terminated. I've stored a gigabyte in them in a few milliseconds. There's no need to allocate or free memory either... it's like freaking magic.
I guess you're going to implement your from scratch, or is there some prior art you're likely to use?
Arthur Whitney however is nuts.