Commit | Line | Data |
---|---|---|
bb892cde | 1 | /* |
ba318903 | 2 | Copyright (C) 1993-1998, 2001-2014 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 | ||
55660072 | 22 | #include "XMenuInt.h" |
e745ede7 DL |
23 | |
24 | struct qelem { | |
25 | struct qelem *q_forw; | |
26 | struct qelem *q_back; | |
27 | char q_data[1]; | |
28 | }; | |
29 | ||
30 | /* Insert ELEM into a doubly-linked list, after PREV. */ | |
31 | ||
32 | void | |
55660072 | 33 | emacs_insque (void *velem, void *vprev) |
e745ede7 | 34 | { |
55660072 PE |
35 | struct qelem *elem = velem; |
36 | struct qelem *prev = vprev; | |
e745ede7 DL |
37 | struct qelem *next = prev->q_forw; |
38 | prev->q_forw = elem; | |
39 | if (next) | |
40 | next->q_back = elem; | |
41 | elem->q_forw = next; | |
42 | elem->q_back = prev; | |
43 | } | |
44 | ||
45 | /* Unlink ELEM from the doubly-linked list that it is in. */ | |
46 | ||
55660072 PE |
47 | void |
48 | emacs_remque (void *velem) | |
e745ede7 | 49 | { |
55660072 | 50 | struct qelem *elem = velem; |
e745ede7 DL |
51 | struct qelem *next = elem->q_forw; |
52 | struct qelem *prev = elem->q_back; | |
53 | if (next) | |
54 | next->q_back = prev; | |
55 | if (prev) | |
56 | prev->q_forw = next; | |
57 | } |