alloc_string_tv(char_u *s)
{
    typval_T	*rettv;

    rettv = alloc_tv();
    if (rettv != NULL)
    {
	rettv->v_type = VAR_STRING;
	rettv->vval.v_string = s;
    }
    else
	vim_free(s);
    return rettv;
}