@divVerent @Suiseiseki @wolf480pl @a1ba back when i had that code i basically made several accessors and iterators to deal with it. you told it if you were dealing with graphemes, or just code points, and it had heuristics and loops to check the nearest safe split point at a given byte.

i don't think i have that C code since ages. shame since it would have been neat resume fodder before chatgpt.