joinlength
need += joinlength(ne->n_aliases) + 1;
need += joinlength(ne->n_aliases) + 1;
need += joinlength(gr->gr_mem) + 1;
need += joinlength(sv->s_aliases) + 1;
need += joinlength(pr->p_aliases) + 1;
need += joinlength(ho->h_aliases) + 1;
static size_t joinlength(char * const *argv);