88 lines
2.3 KiB
C
88 lines
2.3 KiB
C
/*-
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* LstAppend.c --
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* Add a new node with a new datum after an existing node
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*
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* Copyright (c) 1988 by University of California Regents
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*
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* Permission to use, copy, modify, and distribute this
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* software and its documentation for any purpose and without
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* fee is hereby granted, provided that the above copyright
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* notice appears in all copies. Neither the University of California nor
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* Adam de Boor makes any representations about the suitability of this
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* software for any purpose. It is provided "as is" without
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* express or implied warranty.
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*/
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#if !defined(lint) && defined(keep_rcsid)
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static char *rcsid =
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"Id: lstAppend.c,v 1.6 89/06/13 15:01:33 adam Exp $ SPRITE (Berkeley)";
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#endif lint
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#include "lstInt.h"
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/*-
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*-----------------------------------------------------------------------
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* Lst_Append --
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* Create a new node and add it to the given list after the given node.
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*
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* Results:
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* SUCCESS if all went well.
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*
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* Side Effects:
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* A new ListNode is created and linked in to the List. The lastPtr
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* field of the List will be altered if ln is the last node in the
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* list. lastPtr and firstPtr will alter if the list was empty and
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* ln was NILLNODE.
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*
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*-----------------------------------------------------------------------
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*/
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ReturnStatus
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Lst_Append (l, ln, d)
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Lst l; /* affected list */
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LstNode ln; /* node after which to append the datum */
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ClientData d; /* said datum */
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{
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register List list;
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register ListNode lNode;
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register ListNode nLNode;
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if (LstValid (l) && (ln == NILLNODE && LstIsEmpty (l))) {
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goto ok;
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}
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if (!LstValid (l) || LstIsEmpty (l) || ! LstNodeValid (ln, l)) {
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return (FAILURE);
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}
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ok:
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list = (List)l;
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lNode = (ListNode)ln;
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PAlloc (nLNode, ListNode);
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nLNode->datum = d;
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nLNode->useCount = nLNode->flags = 0;
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if (lNode == NilListNode) {
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if (list->isCirc) {
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nLNode->nextPtr = nLNode->prevPtr = nLNode;
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} else {
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nLNode->nextPtr = nLNode->prevPtr = NilListNode;
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}
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list->firstPtr = list->lastPtr = nLNode;
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} else {
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nLNode->prevPtr = lNode;
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nLNode->nextPtr = lNode->nextPtr;
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lNode->nextPtr = nLNode;
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if (nLNode->nextPtr != NilListNode) {
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nLNode->nextPtr->prevPtr = nLNode;
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}
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if (lNode == list->lastPtr) {
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list->lastPtr = nLNode;
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}
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}
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return (SUCCESS);
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}
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