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/* $OpenPackages$ */
/* $OpenBSD: lstAppend.c,v 1.19 2007/09/16 09:46:14 espie Exp $ */
/* $NetBSD: lstAppend.c,v 1.5 1996/11/06 17:59:31 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. 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.
*/
/*-
* LstAppend.c --
* Add a new node with a new datum after an existing node
*/
#include "lstInt.h"
#include <sys/types.h>
#include <stddef.h>
#include "memory.h"
/*-
*-----------------------------------------------------------------------
* Lst_Append --
* Create a new node and add it to the given list after the given node.
*
* Side Effects:
* A new ListNode is created and linked in to the List. The lastPtr
* field of the List will be altered if ln is the last node in the
* list. lastPtr and firstPtr will alter if the list was empty and
* ln was NULL.
*
*-----------------------------------------------------------------------
*/
void
Lst_Append(Lst l, LstNode after, void *d)
{
LstNode nLNode;
if (after == NULL && !Lst_IsEmpty(l))
return;
if (after != NULL && Lst_IsEmpty(l))
return;
PAlloc(nLNode, LstNode);
nLNode->datum = d;
if (after == NULL) {
nLNode->nextPtr = nLNode->prevPtr = NULL;
l->firstPtr = l->lastPtr = nLNode;
} else {
nLNode->prevPtr = after;
nLNode->nextPtr = after->nextPtr;
after->nextPtr = nLNode;
if (nLNode->nextPtr != NULL)
nLNode->nextPtr->prevPtr = nLNode;
if (after == l->lastPtr)
l->lastPtr = nLNode;
}
}
void
Lst_AtEnd(Lst l, void *d)
{
LstNode ln;
PAlloc(ln, LstNode);
ln->datum = d;
ln->prevPtr = l->lastPtr;
ln->nextPtr = NULL;
if (l->lastPtr == NULL)
l->firstPtr = ln;
else
l->lastPtr->nextPtr = ln;
l->lastPtr = ln;
}
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