1 /* 2 * Copyright (c) 1988, 1989, 1990 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Adam de Boor. 7 * 8 * Redistribution and use in source and binary forms are permitted 9 * provided that the above copyright notice and this paragraph are 10 * duplicated in all such forms and that any documentation, 11 * advertising materials, and other materials related to such 12 * distribution and use acknowledge that the software was developed 13 * by the University of California, Berkeley. The name of the 14 * University may not be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 18 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 19 */ 20 21 #ifndef lint 22 static char sccsid[] = "@(#)lstMember.c 5.2 (Berkeley) 03/11/90"; 23 #endif /* not lint */ 24 25 /*- 26 * lstMember.c -- 27 * See if a given datum is on a given list. 28 */ 29 30 #include "lstInt.h" 31 32 LstNode 33 Lst_Member (l, d) 34 Lst l; 35 ClientData d; 36 { 37 List list = (List) l; 38 register ListNode lNode; 39 40 lNode = list->firstPtr; 41 if (lNode == NilListNode) { 42 return NILLNODE; 43 } 44 45 do { 46 if (lNode->datum == d) { 47 return (LstNode)lNode; 48 } 49 lNode = lNode->nextPtr; 50 } while (lNode != NilListNode && lNode != list->firstPtr); 51 52 return NILLNODE; 53 } 54