isadir
buf = isadir();
char isadir[32];
isalen = barg_isadir_var(isadir, sizeof (isadir));
if (bfslen >= sizeof (bootfs) || isalen >= sizeof (isadir))
ISADIR_VAR, strlen(ISADIR_VAR), isadir, isalen)) != 0)
char isadir[32];
if ((isalen = barg_isadir_var(isadir, sizeof (isadir))) >= sizeof
(isadir))
ISADIR_VAR, strlen(ISADIR_VAR), isadir, isalen);