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Import of Empire 4.2.12

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This commit is contained in:
Markus Armbruster 2003-08-23 12:23:04 +00:00
commit d8b7fdfae1
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src/lib/gen/queue.c Normal file
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/*
* Empire - A multi-player, client/server Internet based war game.
* Copyright (C) 1986-2000, Dave Pare, Jeff Bailey, Thomas Ruschak,
* Ken Stevens, Steve McClure
*
* 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, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* ---
*
* See the "LEGAL", "LICENSE", "CREDITS" and "README" files for all the
* related information and legal notices. It is expected that any future
* projects/authors will amend these files as needed.
*
* ---
*
* queue.c: Various queue routines (for lists)
*
* Known contributors to this file:
*
*/
#include "queue.h"
void
emp_insque(struct emp_qelem *elem, struct emp_qelem *queue)
{
struct emp_qelem *next;
next = queue->q_forw;
queue->q_forw = elem;
elem->q_forw = next;
elem->q_back = queue;
next->q_back = elem;
}
void
emp_remque(struct emp_qelem *elem)
{
if (elem == (struct emp_qelem *)0)
return;
if (elem->q_forw != (struct emp_qelem *)0)
elem->q_forw->q_back = elem->q_back;
if (elem->q_back != (struct emp_qelem *)0)
elem->q_back->q_forw = elem->q_forw;
}
void
emp_initque(struct emp_qelem *elem)
{
elem->q_forw = elem;
elem->q_back = elem;
}