35     if (m->next != NULL)  in link_line_buf()
41         s->next = NULL;  in link_line_buf()
49     if ((s->prev != NULL) && (s->next != NULL))  in unlink_line_buf()
53         s->next = NULL;  in unlink_line_buf()
54         s->prev = NULL;  in unlink_line_buf()
56     else if (s->next != NULL)  in unlink_line_buf()
58         s->prev = NULL;  in unlink_line_buf()
59         (s->next)->prev = NULL;  in unlink_line_buf()
60         s->next = NULL;  in unlink_line_buf()
62     else if (s->prev != NULL)  in unlink_line_buf()
64         s->next = 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()
98     lb_heap[0].prev = NULL;  in init_lb_heap()
106     lb_heap[i].next = NULL;  in init_lb_heap()
220         if (tb->cur->next == NULL)  in m_putchar()
225                 if (tmp->prev == NULL)  in m_putchar()
230             while (tmp->prev != NULL)  in m_putchar()
312         if (lb == NULL)  in text_buf_to_vram()