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
36 static char rcsid[] = "$NetBSD: lstAppend.c,v 1.14 2009/01/23 21:26:30 dsl Exp $";
37 #else
38 #include <sys/cdefs.h>
39 #ifndef lint
40 #if 0
41 static char sccsid[] = "@(#)lstAppend.c 8.1 (Berkeley) 6/6/93";
42 #else
43 __RCSID("$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 */
76 ReturnStatus
Lst_InsertAfter(Lst l,LstNode ln,void * d)77 Lst_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