wind_stringprep
ret = wind_stringprep(name, len, *rname, rlen, flags);
ret = wind_stringprep(u, u_len, norm, &norm_len, WIND_PROFILE_NAME);
ret = wind_stringprep(t->in, t->ilen, out, &olen,
int wind_stringprep(const uint32_t *, size_t,