30 static void link_line_buf(LINE_BUF * m, LINE_BUF * s)  in link_line_buf()  argument
34         s->next = m->next;  in link_line_buf()
35         (s->next)->prev = s;  in link_line_buf()
38         s->next = NULL;  in link_line_buf()
40     m->next = s;  in link_line_buf()
41     s->prev = m;  in link_line_buf()
44 static void unlink_line_buf(LINE_BUF * s)  in unlink_line_buf()  argument
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()
50         s->next = NULL;  in unlink_line_buf()
51         s->prev = NULL;  in unlink_line_buf()
53     else if (s->next != NULL)  in unlink_line_buf()
55         s->prev = NULL;  in unlink_line_buf()
56         (s->next)->prev = NULL;  in unlink_line_buf()
57         s->next = NULL;  in unlink_line_buf()
59     else if (s->prev != NULL)  in unlink_line_buf()
61         s->next = NULL;  in unlink_line_buf()
62         (s->prev)->next = NULL;  in unlink_line_buf()
63         s->prev = NULL;  in unlink_line_buf()