Comment by SAI_Peregrinus

Yes, my point is just that since all the "strn" C string-handling functions in the standard library use a size_t for the size if you've got more than INT_MAX characters there's not necessarily any problem. INT_MAX is pretty much always going to be lower than SIZE_MAX, even on 32-bit systems since the former is signed and the latter isn't. You just call snprintf or whatnot as usual. If you manage to have more than SIZE_MAX characters, then you have a problem. Libc probably can't solve it for you though, since SIZE_MAX has to be large enough to cover any allocation so you have some sort of segmented architecture that the C standard library isn't expecting.