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/* $NetBSD: lstEnQueue.c,v 1.13 2009/01/23 21:26:30 dsl Exp $ */
/*
* Copyright (c) 1988, 1989, 1990, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Adam de Boor.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef MAKE_NATIVE
static char rcsid[] = "$NetBSD: lstEnQueue.c,v 1.13 2009/01/23 21:26:30 dsl Exp $";
#else
#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)lstEnQueue.c 8.1 (Berkeley) 6/6/93";
#else
__RCSID("$NetBSD: lstEnQueue.c,v 1.13 2009/01/23 21:26:30 dsl Exp $");
#endif
#endif /* not lint */
#endif
/*-
* LstEnQueue.c--
* Treat the list as a queue and place a datum at its end
*/
#include "lstInt.h"
/*-
*-----------------------------------------------------------------------
* Lst_EnQueue --
* Add the datum to the tail of the given list.
*
* Results:
* SUCCESS or FAILURE as returned by Lst_InsertAfter.
*
* Side Effects:
* the lastPtr field is altered all the time and the firstPtr field
* will be altered if the list used to be empty.
*
*-----------------------------------------------------------------------
*/
ReturnStatus
Lst_EnQueue(Lst l, void *d)
{
if (LstValid (l) == FALSE) {
return (FAILURE);
}
return (Lst_InsertAfter(l, Lst_Last(l), d));
}
ReturnStatus
Lst_EnQueueOnce(Lst l, void *d)
{
if (LstValid (l) == FALSE) {
return (FAILURE);
}
if (Lst_Member(l, d))
return (SUCCESS);
return (Lst_InsertAfter(l, Lst_Last(l), d));
}
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