valid_diff(diff_T *diff)
{
    diff_T	*dp;

    for (dp = curtab->tp_first_diff; dp != NULL; dp = dp->df_next)
	if (dp == diff)
	    return TRUE;
    return FALSE;
}
valid_diff(diff_T *diff)
{
    diff_T	*dp;

    for (dp = curtab->tp_first_diff; dp != NULL; dp = dp->df_next)
	if (dp == diff)
	    return TRUE;
    return FALSE;
}