1*40412Sbostic /* 2*40412Sbostic * Copyright (c) 1988, 1989, 1990 The Regents of the University of California. 3*40412Sbostic * All rights reserved. 4*40412Sbostic * 5*40412Sbostic * This code is derived from software contributed to Berkeley by 6*40412Sbostic * Adam de Boor. 7*40412Sbostic * 8*40412Sbostic * Redistribution and use in source and binary forms are permitted 9*40412Sbostic * provided that the above copyright notice and this paragraph are 10*40412Sbostic * duplicated in all such forms and that any documentation, 11*40412Sbostic * advertising materials, and other materials related to such 12*40412Sbostic * distribution and use acknowledge that the software was developed 13*40412Sbostic * by the University of California, Berkeley. The name of the 14*40412Sbostic * University may not be used to endorse or promote products derived 15*40412Sbostic * from this software without specific prior written permission. 16*40412Sbostic * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 17*40412Sbostic * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 18*40412Sbostic * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 19*40412Sbostic */ 20*40412Sbostic 21*40412Sbostic #ifndef lint 22*40412Sbostic static char sccsid[] = "@(#)lstCur.c 5.2 (Berkeley) 03/11/90"; 23*40412Sbostic #endif /* not lint */ 24*40412Sbostic 2540411Sbostic /*- 2640411Sbostic * LstCur.c -- 2740411Sbostic * Return the current node in the list. 2840411Sbostic * The sequential functions access the list in a slightly different way. 2940411Sbostic * CurPtr points to their idea of the current node in the list and they 3040411Sbostic * access the list based on it. Because the list is circular, Lst_Next 3140411Sbostic * and Lst_Prev will go around the list forever. Lst_IsAtEnd must be 3240411Sbostic * used to determine when to stop. 3340411Sbostic */ 3440411Sbostic 3540411Sbostic #include "lstInt.h" 3640411Sbostic 3740411Sbostic /*- 3840411Sbostic *----------------------------------------------------------------------- 3940411Sbostic * Lst_Cur -- 4040411Sbostic * Return the current node if the list is open for sequential 4140411Sbostic * access. 4240411Sbostic * 4340411Sbostic * Results: 4440411Sbostic * The current node or NILLNODE if the list isn't open.. 4540411Sbostic * 4640411Sbostic * Side Effects: 4740411Sbostic * None. 4840411Sbostic * 4940411Sbostic *----------------------------------------------------------------------- 5040411Sbostic */ 5140411Sbostic LstNode Lst_Cur(l)5240411SbosticLst_Cur (l) 5340411Sbostic Lst l; 5440411Sbostic { 5540411Sbostic register List list = (List)l; 5640411Sbostic 5740411Sbostic if ((LstValid(l) == FALSE) || 5840411Sbostic (list->isOpen == FALSE)) { 5940411Sbostic return (NILLNODE); 6040411Sbostic } else { 6140411Sbostic return ((LstNode)list->curPtr); 6240411Sbostic } 6340411Sbostic } 6440411Sbostic 65