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/* $OpenBSD: lstFirst.c,v 1.5 1999/12/18 21:53:33 espie Exp $ */
/* $NetBSD: lstFirst.c,v 1.5 1996/11/06 17:59:41 christos 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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 lint
#if 0
static char sccsid[] = "@(#)lstFirst.c 8.1 (Berkeley) 6/6/93";
#else
static char rcsid[] = "$OpenBSD: lstFirst.c,v 1.5 1999/12/18 21:53:33 espie Exp $";
#endif
#endif /* not lint */
/*-
* LstFirst.c --
* Return the first node of a list
*/
#include "lstInt.h"
/*-
*-----------------------------------------------------------------------
* Lst_First --
* Return the first node on the given list.
*
* Results:
* The first node or NULL if the list is empty.
*
* Side Effects:
* None.
*
*-----------------------------------------------------------------------
*/
LstNode
Lst_First (l)
Lst l;
{
if (!LstValid (l) || LstIsEmpty (l)) {
return (NULL);
} else {
return ((LstNode)((List)l)->firstPtr);
}
}
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