ftp.nice.ch/pub/next/unix/network/system/gated.2.1pl2.NI.bs.tar.gz#/gated-2.1/src/compat/insque.c

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/*
 *  $Header: /disk/d/src/devel/gated/dist/src/compat/RCS/insque.c,v 2.1 92/02/24 14:15:02 jch Exp $
 */

/*%Copyright%*/
/************************************************************************
*									*
*	GateD, Release 2						*
*									*
*	Copyright (c) 1990,1991,1992 by Cornell University		*
*	    All rights reserved.					*
*									*
*	THIS SOFTWARE IS PROVIDED "AS IS" AND WITHOUT ANY		*
*	EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT		*
*	LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY		*
*	AND FITNESS FOR A PARTICULAR PURPOSE.				*
*									*
*	Royalty-free licenses to redistribute GateD Release		*
*	2 in whole or in part may be obtained by writing to:		*
*									*
*	    GateDaemon Project						*
*	    Information Technologies/Network Resources			*
*	    143 Caldwell Hall						*
*	    Cornell University						*
*	    Ithaca, NY 14853-2602					*
*									*
*	GateD is based on Kirton's EGP, UC Berkeley's routing		*
*	daemon	 (routed), and DCN's HELLO routing Protocol.		*
*	Development of Release 2 has been supported by the		*
*	National Science Foundation.					*
*									*
*	Please forward bug fixes, enhancements and questions to the	*
*	gated mailing list: gated-people@gated.cornell.edu.		*
*									*
*	Authors:							*
*									*
*		Jeffrey C Honig <jch@gated.cornell.edu>			*
*		Scott W Brim <swb@gated.cornell.edu>			*
*									*
*************************************************************************
*									*
*      Portions of this software may fall under the following		*
*      copyrights:							*
*									*
*	Copyright (c) 1988 Regents of the University of California.	*
*	All rights reserved.						*
*									*
*	Redistribution and use in source and binary forms are		*
*	permitted provided that the above copyright notice and		*
*	this paragraph are duplicated in all such forms and that	*
*	any documentation, advertising materials, and other		*
*	materials related to such distribution and use			*
*	acknowledge that the software was developed by the		*
*	University of California, Berkeley.  The name of the		*
*	University may not be used to endorse or promote		*
*	products derived from this software without specific		*
*	prior written permission.  THIS SOFTWARE IS PROVIDED		*
*	``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES,	*
*	INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF	*
*	MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.		*
*									*
************************************************************************/


/*
 * C version of insque and remque functions
 */

struct qelem {
    struct qelem *q_forw;
    struct qelem *q_back;
    char q_data[1];
};

#define	SQE	(struct qelem *)

void
insque(elem, pred)
struct qelem *elem, *pred;
{
    elem->q_forw = pred->q_forw;
    elem->q_back = pred;

    pred->q_forw->q_back = elem;
    pred->q_forw = elem;
}

void
remque(elem)
struct qelem *elem;
{
    elem->q_forw->q_back = elem->q_back;
    elem->q_back->q_forw = elem->q_forw;
}

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