projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| bb2109e7 | 1 | /* |
| 4f703748 KB |
2 | * Copyright (c) 1988, 1989, 1990, 1993 |
| 3 | * The Regents of the University of California. All rights reserved. | |
| c65fedcf | 4 | * |
| bb2109e7 KB |
5 | * This code is derived from software contributed to Berkeley by |
| 6 | * Adam de Boor. | |
| c65fedcf | 7 | * |
| f15db449 | 8 | * %sccs.include.redist.c% |
| c65fedcf | 9 | */ |
| bb2109e7 | 10 | |
| c65fedcf | 11 | #ifndef lint |
| bfdbffbb | 12 | static char sccsid[] = "@(#)lstIsEmpty.c 8.2 (Berkeley) %G%"; |
| bb2109e7 KB |
13 | #endif /* not lint */ |
| 14 | ||
| 15 | /*- | |
| 16 | * LstIsEmpty.c -- | |
| 17 | * A single function to decide if a list is empty | |
| 18 | */ | |
| c65fedcf KB |
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 |