getarg
getarg(argc, argv);
void getarg(int, char **);
fn = getarg(&argc, &argv, "no program filename");
fs = setfs(getarg(&argc, &argv, "no field separator"));
vn = getarg(&argc, &argv, "no variable name");
arg = mod->getarg(&tstr, ctxt, err, endc);
arg = mod->getarg(&tstr, ctxt, err, endc);
void * (*getarg)(const char **, SymTable *, bool, int);