1 /* $NetBSD: lst.h,v 1.105 2024/04/27 17:33:46 rillig Exp $ */
2
3 /*
4 * Copyright (c) 1988, 1989, 1990 The Regents of the University of California.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Adam de Boor.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 * from: @(#)lst.h 8.1 (Berkeley) 6/6/93
35 */
36
37 /*
38 * Copyright (c) 1988, 1989 by Adam de Boor
39 * Copyright (c) 1989 by Berkeley Softworks
40 * All rights reserved.
41 *
42 * This code is derived from software contributed to Berkeley by
43 * Adam de Boor.
44 *
45 * Redistribution and use in source and binary forms, with or without
46 * modification, are permitted provided that the following conditions
47 * are met:
48 * 1. Redistributions of source code must retain the above copyright
49 * notice, this list of conditions and the following disclaimer.
50 * 2. Redistributions in binary form must reproduce the above copyright
51 * notice, this list of conditions and the following disclaimer in the
52 * documentation and/or other materials provided with the distribution.
53 * 3. All advertising materials mentioning features or use of this software
54 * must display the following acknowledgement:
55 * This product includes software developed by the University of
56 * California, Berkeley and its contributors.
57 * 4. Neither the name of the University nor the names of its contributors
58 * may be used to endorse or promote products derived from this software
59 * without specific prior written permission.
60 *
61 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
62 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
63 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
64 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
65 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
66 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
67 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
68 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
69 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
70 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
71 * SUCH DAMAGE.
72 *
73 * from: @(#)lst.h 8.1 (Berkeley) 6/6/93
74 */
75
76 /* Doubly-linked lists of arbitrary pointers. */
77
78 #ifndef MAKE_LST_H
79 #define MAKE_LST_H
80
81 #include <sys/param.h>
82 #include <stdint.h>
83 #include <stdlib.h>
84
85 /* A doubly-linked list of pointers. */
86 typedef struct List List;
87 /* A single node in the doubly-linked list. */
88 typedef struct ListNode ListNode;
89
90 struct ListNode {
91 ListNode *prev; /* previous node in list, or NULL */
92 ListNode *next; /* next node in list, or NULL */
93 void *datum; /* datum associated with this element */
94 };
95
96 struct List {
97 ListNode *first;
98 ListNode *last;
99 };
100
101 /* Free the list nodes. */
102 void Lst_Done(List *);
103 /* Free the list nodes, as well as each node's datum. */
104 void Lst_DoneFree(List *);
105
106 #define LST_INIT { NULL, NULL }
107
108 /* Initialize a list, without memory allocation. */
109 MAKE_INLINE void
Lst_Init(List * list)110 Lst_Init(List *list)
111 {
112 list->first = NULL;
113 list->last = NULL;
114 }
115
116 /* Get information about a list */
117
118 MAKE_INLINE bool MAKE_ATTR_USE
Lst_IsEmpty(List * list)119 Lst_IsEmpty(List *list)
120 {
121 return list->first == NULL;
122 }
123
124 /* Find the first node that contains the given datum, or NULL. */
125 ListNode *Lst_FindDatum(List *, const void *) MAKE_ATTR_USE;
126
127 /* Modify a list */
128
129 /* Insert a datum before the given node. */
130 void Lst_InsertBefore(List *, ListNode *, void *);
131 /* Add a datum at the head of the list. */
132 void Lst_Prepend(List *, void *);
133 /* Add a datum at the tail of the list. */
134 void Lst_Append(List *, void *);
135 /* Remove the node from the list. */
136 void Lst_Remove(List *, ListNode *);
137 void Lst_PrependAll(List *, List *);
138 void Lst_AppendAll(List *, List *);
139 void Lst_MoveAll(List *, List *);
140
141 /* Node-specific functions */
142
143 /* Replace the value of the node. */
144 void LstNode_Set(ListNode *, void *);
145 /* Set the value of the node to NULL. Having NULL in a list is unusual. */
146 void LstNode_SetNull(ListNode *);
147
148 /* Using the list as a queue */
149
150 /* Add a datum at the tail of the queue. */
151 MAKE_INLINE void
Lst_Enqueue(List * list,void * datum)152 Lst_Enqueue(List *list, void *datum)
153 {
154 Lst_Append(list, datum);
155 }
156
157 /* Remove the head node of the queue and return its datum. */
158 void *Lst_Dequeue(List *) MAKE_ATTR_USE;
159
160 /*
161 * A vector is an ordered collection of items, allowing for fast indexed
162 * access.
163 */
164 typedef struct Vector {
165 void *items; /* memory holding the items */
166 size_t itemSize; /* size of a single item */
167 size_t len; /* number of actually usable elements */
168 size_t cap; /* capacity */
169 } Vector;
170
171 void Vector_Init(Vector *, size_t);
172
173 /*
174 * Return the pointer to the given item in the vector.
175 * The returned data is valid until the next modifying operation.
176 */
177 MAKE_INLINE void * MAKE_ATTR_USE
Vector_Get(Vector * v,size_t i)178 Vector_Get(Vector *v, size_t i)
179 {
180 unsigned char *items = v->items;
181 return items + i * v->itemSize;
182 }
183
184 void *Vector_Push(Vector *);
185 void *Vector_Pop(Vector *);
186
187 MAKE_INLINE void
Vector_Done(Vector * v)188 Vector_Done(Vector *v)
189 {
190 free(v->items);
191 }
192
193 #endif
194