1/*	$NetBSD: lstAppend.c,v 1.14 2009/01/23 21:26:30 dsl Exp $	*/
2
3/*
4 * Copyright (c) 1988, 1989, 1990, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Adam de Boor.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 *    may be used to endorse or promote products derived from this software
20 *    without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35#ifndef MAKE_NATIVE
36static char rcsid[] = "$NetBSD: lstAppend.c,v 1.14 2009/01/23 21:26:30 dsl Exp $";
37#else
38#include <sys/cdefs.h>
39#ifndef lint
40#if 0
41static char sccsid[] = "@(#)lstAppend.c	8.1 (Berkeley) 6/6/93";
42#else
43__RCSID("$NetBSD: lstAppend.c,v 1.14 2009/01/23 21:26:30 dsl Exp $");
44#endif
45#endif /* not lint */
46#endif
47
48/*-
49 * LstAppend.c --
50 *	Add a new node with a new datum after an existing node
51 */
52
53#include	"lstInt.h"
54
55/*-
56 *-----------------------------------------------------------------------
57 * Lst_InsertAfter --
58 *	Create a new node and add it to the given list after the given node.
59 *
60 * Input:
61 *	l		affected list
62 *	ln		node after which to append the datum
63 *	d		said datum
64 *
65 * Results:
66 *	SUCCESS if all went well.
67 *
68 * Side Effects:
69 *	A new ListNode is created and linked in to the List. The lastPtr
70 *	field of the List will be altered if ln is the last node in the
71 *	list. lastPtr and firstPtr will alter if the list was empty and
72 *	ln was NULL.
73 *
74 *-----------------------------------------------------------------------
75 */
76ReturnStatus
77Lst_InsertAfter(Lst l, LstNode ln, void *d)
78{
79    List 	list;
80    ListNode	lNode;
81    ListNode	nLNode;
82
83    if (LstValid (l) && (ln == NULL && LstIsEmpty (l))) {
84	goto ok;
85    }
86
87    if (!LstValid (l) || LstIsEmpty (l)  || ! LstNodeValid (ln, l)) {
88	return (FAILURE);
89    }
90    ok:
91
92    list = l;
93    lNode = ln;
94
95    PAlloc (nLNode, ListNode);
96    nLNode->datum = d;
97    nLNode->useCount = nLNode->flags = 0;
98
99    if (lNode == NULL) {
100	if (list->isCirc) {
101	    nLNode->nextPtr = nLNode->prevPtr = nLNode;
102	} else {
103	    nLNode->nextPtr = nLNode->prevPtr = NULL;
104	}
105	list->firstPtr = list->lastPtr = nLNode;
106    } else {
107	nLNode->prevPtr = lNode;
108	nLNode->nextPtr = lNode->nextPtr;
109
110	lNode->nextPtr = nLNode;
111	if (nLNode->nextPtr != NULL) {
112	    nLNode->nextPtr->prevPtr = nLNode;
113	}
114
115	if (lNode == list->lastPtr) {
116	    list->lastPtr = nLNode;
117	}
118    }
119
120    return (SUCCESS);
121}
122
123