There was a unicode text shaper from Japan, a C library, l17n or something like that. But google is unable to find it again. Maybe it is gone.

But the right way to avoid like hell those c++ abominations (there are still people thinking coding c++ makes them smart, at best toxic, but no less worse) and start with roman script and incrementally add supported languages. I did venture in harfbuzz, there is no salvation, the coding is so much c++ brainf*cked better start clean and lean.