| 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 | * from: @(#)lstInt.h 8.1 (Berkeley) 6/6/93
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| 37 | * $FreeBSD: src/usr.bin/make/lst.lib/lstInt.h,v 1.7 1999/08/28 01:03:53 peter Exp $
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| 38 | */
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| 39 |
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| 40 | /*-
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| 41 | * lstInt.h --
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| 42 | * Internals for the list library
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| 43 | */
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| 44 | #ifndef _LSTINT_H_
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| 45 | #define _LSTINT_H_
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| 46 |
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| 47 | #include "make.h"
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| 48 | #include "lst.h"
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| 49 |
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| 50 | typedef struct ListNode {
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| 51 | struct ListNode *prevPtr; /* previous element in list */
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| 52 | struct ListNode *nextPtr; /* next in list */
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| 53 | short useCount:8, /* Count of functions using the node.
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| 54 | * node may not be deleted until count
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| 55 | * goes to 0 */
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| 56 | flags:8; /* Node status flags */
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| 57 | ClientData datum; /* datum associated with this element */
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| 58 | } *ListNode;
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| 59 | /*
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| 60 | * Flags required for synchronization
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| 61 | */
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| 62 | #define LN_DELETED 0x0001 /* List node should be removed when done */
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| 63 |
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| 64 | #define NilListNode ((ListNode)-1)
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| 65 |
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| 66 | typedef enum {
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| 67 | Head, Middle, Tail, Unknown
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| 68 | } Where;
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| 69 |
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| 70 | typedef struct {
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| 71 | ListNode firstPtr; /* first node in list */
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| 72 | ListNode lastPtr; /* last node in list */
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| 73 | Boolean isCirc; /* true if the list should be considered
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| 74 | * circular */
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| 75 | /*
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| 76 | * fields for sequential access
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| 77 | */
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| 78 | Where atEnd; /* Where in the list the last access was */
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| 79 | Boolean isOpen; /* true if list has been Lst_Open'ed */
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| 80 | ListNode curPtr; /* current node, if open. NilListNode if
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| 81 | * *just* opened */
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| 82 | ListNode prevPtr; /* Previous node, if open. Used by
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| 83 | * Lst_Remove */
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| 84 | } *List;
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| 85 |
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| 86 | #define NilList ((List)-1)
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| 87 |
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| 88 | /*
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| 89 | * PAlloc (var, ptype) --
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| 90 | * Allocate a pointer-typedef structure 'ptype' into the variable 'var'
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| 91 | */
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| 92 | #define PAlloc(var,ptype) var = (ptype) emalloc (sizeof (*var))
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| 93 |
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| 94 | /*
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| 95 | * LstValid (l) --
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| 96 | * Return TRUE if the list l is valid
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| 97 | */
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| 98 | #define LstValid(l) (((Lst)l == NILLST) ? FALSE : TRUE)
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| 99 |
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| 100 | /*
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| 101 | * LstNodeValid (ln, l) --
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| 102 | * Return TRUE if the LstNode ln is valid with respect to l
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| 103 | */
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| 104 | #define LstNodeValid(ln, l) ((((LstNode)ln) == NILLNODE) ? FALSE : TRUE)
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| 105 |
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| 106 | /*
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| 107 | * LstIsEmpty (l) --
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| 108 | * TRUE if the list l is empty.
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| 109 | */
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| 110 | #define LstIsEmpty(l) (((List)l)->firstPtr == NilListNode)
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| 111 |
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| 112 | #endif /* _LSTINT_H_ */
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