38         (s->next)->prev = s;  in link_line_buf()
44     s->prev = m;  in link_line_buf()
49     if ((s->prev != NULL) && (s->next != NULL))  in unlink_line_buf()
51         (s->prev)->next = s->next;  in unlink_line_buf()
52         (s->next)->prev = s->prev;  in unlink_line_buf()
54         s->prev = NULL;  in unlink_line_buf()
58         s->prev = NULL;  in unlink_line_buf()
59         (s->next)->prev = NULL;  in unlink_line_buf()
62     else if (s->prev != NULL)  in unlink_line_buf()
65         (s->prev)->next = NULL;  in unlink_line_buf()
66         s->prev = NULL;  in unlink_line_buf()
88     lb->prev = NULL;  in free_line_buf()
89     (lb->next)->prev = lb;  in free_line_buf()
98     lb_heap[0].prev = NULL;  in init_lb_heap()
225                 if (tmp->prev == NULL)  in m_putchar()
227                 tmp = tmp->prev;  in m_putchar()
230             while (tmp->prev != NULL)  in m_putchar()
232                 tmp = tmp->prev;  in m_putchar()