| 1 | /*
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| 2 | * Copyright (c) 1988, 1989, 1990, 1993
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| 3 | * The Regents of the University of California. All rights reserved.
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| 4 | *
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| 5 | * This code is derived from software contributed to Berkeley by
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| 6 | * Adam de Boor.
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| 7 | *
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| 8 | * Redistribution and use in source and binary forms, with or without
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| 9 | * modification, are permitted provided that the following conditions
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| 10 | * are met:
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| 11 | * 1. Redistributions of source code must retain the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer.
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| 13 | * 2. Redistributions in binary form must reproduce the above copyright
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| 14 | * notice, this list of conditions and the following disclaimer in the
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| 15 | * documentation and/or other materials provided with the distribution.
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| 16 | * 3. All advertising materials mentioning features or use of this software
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| 17 | * must display the following acknowledgement:
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| 18 | * This product includes software developed by the University of
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| 19 | * California, Berkeley and its contributors.
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| 20 | * 4. Neither the name of the University nor the names of its contributors
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| 21 | * may be used to endorse or promote products derived from this software
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| 22 | * without specific prior written permission.
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| 23 | *
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| 24 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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| 25 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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| 28 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 29 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 30 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 31 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 32 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 33 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 34 | * SUCH DAMAGE.
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| 35 | *
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| 36 | * $FreeBSD: src/usr.bin/make/lst.lib/lstIsAtEnd.c,v 1.5 1999/08/28 01:03:53 peter Exp $
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| 37 | */
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| 38 |
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| 39 | #ifndef lint
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| 40 | static char sccsid[] = "@(#)lstIsAtEnd.c 8.1 (Berkeley) 6/6/93";
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| 41 | #endif /* not lint */
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| 42 |
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| 43 | /*-
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| 44 | * LstIsAtEnd.c --
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| 45 | * Tell if the current node is at the end of the list.
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| 46 | * The sequential functions access the list in a slightly different way.
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| 47 | * CurPtr points to their idea of the current node in the list and they
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| 48 | * access the list based on it. Because the list is circular, Lst_Next
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| 49 | * and Lst_Prev will go around the list forever. Lst_IsAtEnd must be
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| 50 | * used to determine when to stop.
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| 51 | */
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| 52 |
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| 53 | #include "lstInt.h"
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| 54 |
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| 55 | /*-
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| 56 | *-----------------------------------------------------------------------
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| 57 | * Lst_IsAtEnd --
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| 58 | * Return true if have reached the end of the given list.
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| 59 | *
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| 60 | * Results:
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| 61 | * TRUE if at the end of the list (this includes the list not being
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| 62 | * open or being invalid) or FALSE if not. We return TRUE if the list
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| 63 | * is invalid or unopend so as to cause the caller to exit its loop
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| 64 | * asap, the assumption being that the loop is of the form
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| 65 | * while (!Lst_IsAtEnd (l)) {
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| 66 | * ...
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| 67 | * }
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| 68 | *
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| 69 | * Side Effects:
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| 70 | * None.
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| 71 | *
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| 72 | *-----------------------------------------------------------------------
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| 73 | */
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| 74 | Boolean
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| 75 | Lst_IsAtEnd (l)
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| 76 | Lst l;
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| 77 | {
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| 78 | register List list = (List) l;
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| 79 |
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| 80 | return (!LstValid (l) || !list->isOpen ||
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| 81 | (list->atEnd == Head) || (list->atEnd == Tail));
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| 82 | }
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| 83 |
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