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Diffstat (limited to 'lst.lib/lstInt.h')
| -rw-r--r-- | lst.lib/lstInt.h | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/lst.lib/lstInt.h b/lst.lib/lstInt.h new file mode 100644 index 0000000..34a2fbd --- /dev/null +++ b/lst.lib/lstInt.h @@ -0,0 +1,105 @@ +/* $NetBSD: lstInt.h,v 1.20 2009/01/24 14:43:29 dsl Exp $ */ + +/* + * Copyright (c) 1988, 1989, 1990, 1993 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Adam de Boor. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * from: @(#)lstInt.h 8.1 (Berkeley) 6/6/93 + */ + +/*- + * lstInt.h -- + * Internals for the list library + */ +#ifndef _LSTINT_H_ +#define _LSTINT_H_ + +#include "../lst.h" +#include "../make_malloc.h" + +typedef struct ListNode { + struct ListNode *prevPtr; /* previous element in list */ + struct ListNode *nextPtr; /* next in list */ + unsigned int useCount:8, /* Count of functions using the node. + * node may not be deleted until count + * goes to 0 */ + flags:8; /* Node status flags */ + void *datum; /* datum associated with this element */ +} *ListNode; +/* + * Flags required for synchronization + */ +#define LN_DELETED 0x0001 /* List node should be removed when done */ + +typedef enum { + Head, Middle, Tail, Unknown +} Where; + +typedef struct List { + ListNode firstPtr; /* first node in list */ + ListNode lastPtr; /* last node in list */ + Boolean isCirc; /* true if the list should be considered + * circular */ +/* + * fields for sequential access + */ + Where atEnd; /* Where in the list the last access was */ + Boolean isOpen; /* true if list has been Lst_Open'ed */ + ListNode curPtr; /* current node, if open. NULL if + * *just* opened */ + ListNode prevPtr; /* Previous node, if open. Used by + * Lst_Remove */ +} *List; + +/* + * PAlloc (var, ptype) -- + * Allocate a pointer-typedef structure 'ptype' into the variable 'var' + */ +#define PAlloc(var,ptype) var = (ptype) bmake_malloc(sizeof *(var)) + +/* + * LstValid (l) -- + * Return TRUE if the list l is valid + */ +#define LstValid(l) ((Lst)(l) != NULL) + +/* + * LstNodeValid (ln, l) -- + * Return TRUE if the LstNode ln is valid with respect to l + */ +#define LstNodeValid(ln, l) ((ln) != NULL) + +/* + * LstIsEmpty (l) -- + * TRUE if the list l is empty. + */ +#define LstIsEmpty(l) (((List)(l))->firstPtr == NULL) + +#endif /* _LSTINT_H_ */ |