073f669ad5
These functions made the code larger than necessary. The prev and next fields are published intentionally since navigating in a doubly-linked list is simple to do and there is no need to wrap this in a layer of function calls, not even syntactically. (On the execution level, the function calls had been inlined anyway.)
228 lines
8.8 KiB
C
228 lines
8.8 KiB
C
/* $NetBSD: lst.h,v 1.69 2020/09/26 17:15:20 rillig Exp $ */
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/*
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* Copyright (c) 1988, 1989, 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Adam de Boor.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: @(#)lst.h 8.1 (Berkeley) 6/6/93
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*/
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/*
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* Copyright (c) 1988, 1989 by Adam de Boor
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* Copyright (c) 1989 by Berkeley Softworks
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Adam de Boor.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: @(#)lst.h 8.1 (Berkeley) 6/6/93
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*/
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/* Doubly-linked lists of arbitrary pointers. */
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#ifndef MAKE_LST_H
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#define MAKE_LST_H
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#include <sys/param.h>
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#include <stdint.h>
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#include <stdlib.h>
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/* A doubly-linked list of pointers. */
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typedef struct List List;
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/* A single node in the doubly-linked list. */
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typedef struct ListNode ListNode;
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struct ListNode {
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ListNode *prev; /* previous node in list, or NULL */
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ListNode *next; /* next node in list, or NULL */
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uint8_t priv_useCount; /* Count of functions using the node.
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* node may not be deleted until count
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* goes to 0 */
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Boolean priv_deleted; /* List node should be removed when done */
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union {
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void *datum; /* datum associated with this element */
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const struct GNode *priv_gnode; /* alias, just for debugging */
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const char *priv_str; /* alias, just for debugging */
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};
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};
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typedef enum {
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Head, Middle, Tail, Unknown
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} ListForEachUntilWhere;
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struct List {
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ListNode *first; /* first node in list */
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ListNode *last; /* last node in list */
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/* fields for sequential access */
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Boolean priv_isOpen; /* true if list has been Lst_Open'ed */
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ListForEachUntilWhere priv_lastAccess;
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ListNode *priv_curr; /* current node, if open. NULL if
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* *just* opened */
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ListNode *priv_prev; /* Previous node, if open. Used by Lst_Remove */
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};
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/* Copy a node, usually by allocating a copy of the given object.
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* For reference-counted objects, the original object may need to be
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* modified, therefore the parameter is not const. */
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typedef void *LstCopyProc(void *);
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/* Free the datum of a node, called before freeing the node itself. */
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typedef void LstFreeProc(void *);
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/* Return TRUE if the datum matches the args, for Lst_Find. */
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typedef Boolean LstFindProc(const void *datum, const void *args);
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/* An action for Lst_ForEach. */
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typedef void LstActionProc(void *datum, void *args);
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/* An action for Lst_ForEachUntil. */
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typedef int LstActionUntilProc(void *datum, void *args);
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/* Create or destroy a list */
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/* Create a new list. */
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List *Lst_Init(void);
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/* Duplicate an existing list. */
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List *Lst_Copy(List *, LstCopyProc);
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/* Free the list, leaving the node data unmodified. */
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void Lst_Free(List *);
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/* Free the list, freeing the node data using the given function. */
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void Lst_Destroy(List *, LstFreeProc);
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/* Get information about a list */
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static inline MAKE_ATTR_UNUSED Boolean
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Lst_IsEmpty(List *list) { return list->first == NULL; }
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/* Return the first node of the list, or NULL if the list is empty. */
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static inline MAKE_ATTR_UNUSED ListNode *
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Lst_First(List *list) { return list->first; }
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/* Return the last node of the list, or NULL if the list is empty. */
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static inline MAKE_ATTR_UNUSED ListNode *
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Lst_Last(List *list) { return list->last; }
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/* Find the first node for which the function returns TRUE, or NULL. */
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ListNode *Lst_Find(List *, LstFindProc, const void *);
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/* Find the first node for which the function returns TRUE, or NULL.
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* The search starts at the given node, towards the end of the list. */
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ListNode *Lst_FindFrom(List *, ListNode *, LstFindProc, const void *);
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/* Find the first node that contains the given datum, or NULL. */
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ListNode *Lst_FindDatum(List *, const void *);
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/* Modify a list */
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/* Insert a datum before the given node. */
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void Lst_InsertBefore(List *, ListNode *, void *);
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/* Place a datum at the front of the list. */
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void Lst_Prepend(List *, void *);
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/* Place a datum at the end of the list. */
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void Lst_Append(List *, void *);
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/* Remove the node from the list. */
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void Lst_Remove(List *, ListNode *);
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void Lst_PrependAll(List *, List *);
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void Lst_AppendAll(List *, List *);
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void Lst_MoveAll(List *, List *);
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/* Node-specific functions */
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/* Return the datum of the node. Usually not NULL. */
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static inline MAKE_ATTR_UNUSED void *
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LstNode_Datum(ListNode *node) { return node->datum; }
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/* Replace the value of the node. */
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void LstNode_Set(ListNode *, void *);
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/* Set the value of the node to NULL. Having NULL in a list is unusual. */
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void LstNode_SetNull(ListNode *);
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/* Iterating over a list, using a callback function */
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/* Apply a function to each datum of the list.
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* The function must not modify the structure of the list, for example by
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* adding or removing nodes. */
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void Lst_ForEach(List *, LstActionProc, void *);
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/* Apply a function to each datum of the list, until the callback function
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* returns non-zero. */
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int Lst_ForEachUntil(List *, LstActionUntilProc, void *);
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/* Iterating over a list while keeping track of the current node and possible
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* concurrent modifications */
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/* Start iterating the list. */
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void Lst_Open(List *);
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/* Return the next node, or NULL. */
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ListNode *Lst_Next(List *);
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/* Finish iterating the list. */
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void Lst_Close(List *);
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/* Using the list as a queue */
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/* Add a datum at the tail of the queue. */
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void Lst_Enqueue(List *, void *);
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/* Remove the head node of the queue and return its datum. */
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void *Lst_Dequeue(List *);
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/* A stack is a very simple collection of items that only allows access to the
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* top-most item. */
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typedef struct Stack {
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void **items;
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size_t len;
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size_t cap;
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} Stack;
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void Stack_Init(Stack *);
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Boolean Stack_IsEmpty(Stack *);
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void Stack_Push(Stack *, void *);
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void *Stack_Pop(Stack *);
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void Stack_Done(Stack *);
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#endif /* MAKE_LST_H */
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