minix/commands/make/lst.lib/lstAppend.c

/*	$NetBSD: lstAppend.c,v 1.14 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: lstAppend.c,v 1.14 2009/01/23 21:26:30 dsl Exp $";
#else
#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)lstAppend.c	8.1 (Berkeley) 6/6/93";
#else
__RCSID("$NetBSD: lstAppend.c,v 1.14 2009/01/23 21:26:30 dsl Exp $");
#endif
#endif /* not lint */
#endif

/*-
 * LstAppend.c --
 *	Add a new node with a new datum after an existing node
 */

#include	"lstInt.h"

/*-
 *-----------------------------------------------------------------------
 * Lst_InsertAfter --
 *	Create a new node and add it to the given list after the given node.
 *
 * Input:
 *	l		affected list
 *	ln		node after which to append the datum
 *	d		said datum
 *
 * Results:
 *	SUCCESS if all went well.
 *
 * 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.
 *
 *-----------------------------------------------------------------------
 */
ReturnStatus
Lst_InsertAfter(Lst l, LstNode ln, void *d)
{
    List 	list;
    ListNode	lNode;
    ListNode	nLNode;

    if (LstValid (l) && (ln == NULL && LstIsEmpty (l))) {
	goto ok;
    }

    if (!LstValid (l) || LstIsEmpty (l)  || ! LstNodeValid (ln, l)) {
	return (FAILURE);
    }
    ok:

    list = l;
    lNode = ln;

    PAlloc (nLNode, ListNode);
    nLNode->datum = d;
    nLNode->useCount = nLNode->flags = 0;

    if (lNode == NULL) {
	if (list->isCirc) {
	    nLNode->nextPtr = nLNode->prevPtr = nLNode;
	} else {
	    nLNode->nextPtr = nLNode->prevPtr = NULL;
	}
	list->firstPtr = list->lastPtr = nLNode;
    } else {
	nLNode->prevPtr = lNode;
	nLNode->nextPtr = lNode->nextPtr;

	lNode->nextPtr = nLNode;
	if (nLNode->nextPtr != NULL) {
	    nLNode->nextPtr->prevPtr = nLNode;
	}

	if (lNode == list->lastPtr) {
	    list->lastPtr = nLNode;
	}
    }

    return (SUCCESS);
}