Commit | Line | Data |
---|---|---|
bb892cde | 1 | /* |
73b0cd50 | 2 | Copyright (C) 1993-1998, 2001-2011 Free Software Foundation, Inc. |
8ac6262d | 3 | |
4eaa4034 | 4 | This program is free software: you can redistribute it and/or modify |
8ac6262d | 5 | it under the terms of the GNU General Public License as published by |
4eaa4034 GM |
6 | the Free Software Foundation, either version 3 of the License, or |
7 | (at your option) any later version. | |
8ac6262d RS |
8 | |
9 | This program is distributed in the hope that it will be useful, | |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | GNU General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU General Public License | |
4eaa4034 | 15 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
b398a621 | 16 | |
e745ede7 | 17 | /* This file implements the emacs_insque and emacs_remque functions, |
8ac6262d | 18 | clones of the insque and remque functions of BSD. They and all |
e745ede7 DL |
19 | their callers have been renamed to emacs_mumble to allow us to |
20 | include this file in the menu library on all systems. */ | |
21 | ||
22 | ||
23 | struct qelem { | |
24 | struct qelem *q_forw; | |
25 | struct qelem *q_back; | |
26 | char q_data[1]; | |
27 | }; | |
28 | ||
29 | /* Insert ELEM into a doubly-linked list, after PREV. */ | |
30 | ||
31 | void | |
b782e2d7 | 32 | emacs_insque (struct qelem *elem, struct qelem *prev) |
e745ede7 DL |
33 | { |
34 | struct qelem *next = prev->q_forw; | |
35 | prev->q_forw = elem; | |
36 | if (next) | |
37 | next->q_back = elem; | |
38 | elem->q_forw = next; | |
39 | elem->q_back = prev; | |
40 | } | |
41 | ||
42 | /* Unlink ELEM from the doubly-linked list that it is in. */ | |
43 | ||
b782e2d7 | 44 | emacs_remque (struct qelem *elem) |
e745ede7 DL |
45 | { |
46 | struct qelem *next = elem->q_forw; | |
47 | struct qelem *prev = elem->q_back; | |
48 | if (next) | |
49 | next->q_back = prev; | |
50 | if (prev) | |
51 | prev->q_forw = next; | |
52 | } | |
ab5796a9 | 53 |