Row *
b_getline(Row *r, int l) {
	if (l == 1) return r;
	if (r->n == NULL) return NULL;
	return b_getline(r->n, l - 1);
}

Row *
b_insert(Row *r) {
        Row *new = calloc(1, sizeof(Row));
        new->n = r->n;
        new->p = r;
        r->n = new;
	return new;
}

void
b_truncate(Row *row) {
        Row *n = row->n;
	row->n = NULL;
        if (n != NULL) {
                b_truncate(n);
                free(n);
        }
}

int
b_countlines(Row *row) {
	int lines = 1;
	for(; row->n != NULL; row = row->n) lines++;
	return lines;
}