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36 * $FreeBSD: src/usr.bin/make/lst.lib/lstInsert.c,v 1.6 1999/08/28 01:03:52 peter Exp $
37 * $DragonFly: src/usr.bin/make/lst.lib/Attic/lstInsert.c,v 1.2 2003/06/17 04:29:29 dillon Exp $
39 * @(#)lstInsert.c 8.1 (Berkeley) 6/6/93
44 * Insert a new datum before an old one
50 *-----------------------------------------------------------------------
52 * Insert a new node with the given piece of data before the given
53 * node in the given list.
59 * the firstPtr field will be changed if ln is the first node in the
62 *-----------------------------------------------------------------------
66 Lst l; /* list to manipulate */
67 LstNode ln; /* node before which to insert d */
68 ClientData d; /* datum to be inserted */
70 register ListNode nLNode; /* new lnode for d */
71 register ListNode lNode = (ListNode)ln;
72 register List list = (List)l;
76 * check validity of arguments
78 if (LstValid (l) && (LstIsEmpty (l) && ln == NILLNODE))
81 if (!LstValid (l) || LstIsEmpty (l) || !LstNodeValid (ln, l)) {
86 PAlloc (nLNode, ListNode);
89 nLNode->useCount = nLNode->flags = 0;
93 nLNode->prevPtr = nLNode->nextPtr = nLNode;
95 nLNode->prevPtr = nLNode->nextPtr = NilListNode;
97 list->firstPtr = list->lastPtr = nLNode;
99 nLNode->prevPtr = lNode->prevPtr;
100 nLNode->nextPtr = lNode;
102 if (nLNode->prevPtr != NilListNode) {
103 nLNode->prevPtr->nextPtr = nLNode;
105 lNode->prevPtr = nLNode;
107 if (lNode == list->firstPtr) {
108 list->firstPtr = nLNode;