35         (s->next)->prev = s;  in link_line_buf()
41     s->prev = m;  in link_line_buf()
46     if ((s->prev != NULL) && (s->next != NULL))  in unlink_line_buf()
48         (s->prev)->next = s->next;  in unlink_line_buf()
49         (s->next)->prev = s->prev;  in unlink_line_buf()
51         s->prev = NULL;  in unlink_line_buf()
55         s->prev = NULL;  in unlink_line_buf()
56         (s->next)->prev = NULL;  in unlink_line_buf()
59     else if (s->prev != NULL)  in unlink_line_buf()
62         (s->prev)->next = NULL;  in unlink_line_buf()
63         s->prev = NULL;  in unlink_line_buf()
85     lb->prev = NULL;  in free_line_buf()
86     (lb->next)->prev = lb;  in free_line_buf()
95     lb_heap[0].prev = NULL;  in init_lb_heap()
184                 if (tmp->prev == NULL)  in m_putchar()
186                 tmp = tmp->prev;  in m_putchar()
189             while (tmp->prev != NULL)  in m_putchar()
191                 tmp = tmp->prev;  in m_putchar()