diff options
Diffstat (limited to 'lib/dpkg/dlist.h')
| -rw-r--r-- | lib/dpkg/dlist.h | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/lib/dpkg/dlist.h b/lib/dpkg/dlist.h new file mode 100644 index 0000000..1d3a91e --- /dev/null +++ b/lib/dpkg/dlist.h @@ -0,0 +1,45 @@ +/* + * dlist.h - macros for handling doubly linked lists + * + * Copyright © 1997-1999 Ian Jackson <ijackson@chiark.greenend.org.uk> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <https://www.gnu.org/licenses/>. + */ + +#ifndef DPKG_DLIST_H +#define DPKG_DLIST_H + +#define LIST_UNLINK_PART(list, node, part) \ + do { \ + if ((node)->part.prev) \ + (node)->part.prev->part.next = (node)->part.next; \ + else \ + (list).head = (node)->part.next; \ + if ((node)->part.next) \ + (node)->part.next->part.prev = (node)->part.prev; \ + else \ + (list).tail = (node)->part.prev; \ + } while (0) + +#define LIST_LINK_TAIL_PART(list, node, part) \ + do { \ + (node)->part.next = NULL; \ + (node)->part.prev = (list).tail; \ + if ((list).tail) \ + (list).tail->part.next = (node); \ + else (list).head = (node); \ + (list).tail = (node); \ + } while (0) + +#endif |