1/* Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 2001, 2002, 2003,
2                 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
3
4This program is free software; you can redistribute it and/or modify
5it under the terms of the GNU General Public License as published by
6the Free Software Foundation; either version 2, or (at your option)
7any later version.
8
9This program is distributed in the hope that it will be useful,
10but WITHOUT ANY WARRANTY; without even the implied warranty of
11MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12GNU General Public License for more details.
13
14You should have received a copy of the GNU General Public License
15along with this program; see the file COPYING.  If not, write to
16the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
17Boston, MA 02110-1301, USA.  */
18
19/* This file implements the emacs_insque and emacs_remque functions,
20   clones of the insque and remque functions of BSD.  They and all
21   their callers have been renamed to emacs_mumble to allow us to
22   include this file in the menu library on all systems.  */
23
24
25struct qelem {
26  struct    qelem *q_forw;
27  struct    qelem *q_back;
28  char q_data[1];
29};
30
31/* Insert ELEM into a doubly-linked list, after PREV.  */
32
33void
34emacs_insque (elem, prev)
35     struct qelem *elem, *prev;
36{
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
47emacs_remque (elem)
48     struct qelem *elem;
49{
50  struct qelem *next = elem->q_forw;
51  struct qelem *prev = elem->q_back;
52  if (next)
53    next->q_back = prev;
54  if (prev)
55    prev->q_forw = next;
56}
57
58/* arch-tag: a8719d1a-5c3f-4bce-b36b-173106d36165
59   (do not change this comment) */
60