af_getbyname
static struct afswtch *af_getbyname(const char *name);
afp = af_getbyname("inet");
afp = af_getbyname("link");
nafp = af_getbyname(*argv);
lafp = af_getbyname("lladdr");
const struct afswtch *afp = af_getbyname(*argv);
args->afp = af_getbyname(args_peek(args));