1 /*
2  * Copyright (c) 1988, 1989, 1990, 1993
3  *	The Regents of the University of California.  All rights reserved.
4  *
5  * This code is derived from software contributed to Berkeley by
6  * Adam de Boor.
7  *
8  * %sccs.include.redist.c%
9  */
10 
11 #ifndef lint
12 static char sccsid[] = "@(#)lstIsEmpty.c	8.2 (Berkeley) 04/28/95";
13 #endif /* not lint */
14 
15 /*-
16  * LstIsEmpty.c --
17  *	A single function to decide if a list is empty
18  */
19 
20 #include	"lstInt.h"
21 
22 /*-
23  *-----------------------------------------------------------------------
24  * Lst_IsEmpty --
25  *	Return TRUE if the given list is empty.
26  *
27  * Results:
28  *	TRUE if the list is empty, FALSE otherwise.
29  *
30  * Side Effects:
31  *	None.
32  *
33  *	A list is considered empty if its firstPtr == NilListNode (or if
34  *	the list itself is NILLIST).
35  *-----------------------------------------------------------------------
36  */
37 Boolean
38 Lst_IsEmpty (l)
39     Lst	l;
40 {
41     return ( ! LstValid (l) || LstIsEmpty(l));
42 }
43 
44