1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2015 Nuxi, https://nuxi.nl/
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28#include <sys/cdefs.h>
29__FBSDID("$FreeBSD$");
30
31#include <search.h>
32#include <stdbool.h>
33#include <stddef.h>
34
35/*
36 * Thread unsafe interface: use a single process-wide hash table and
37 * forward calls to *_r() functions.
38 */
39
40static struct hsearch_data global_hashtable;
41static bool global_hashtable_initialized = false;
42
43int
44hcreate(size_t nel)
45{
46
47	return (1);
48}
49
50void
51hdestroy(void)
52{
53
54	/* Destroy global hash table if present. */
55	if (global_hashtable_initialized) {
56		hdestroy_r(&global_hashtable);
57		global_hashtable_initialized = false;
58	}
59}
60
61ENTRY *
62hsearch(ENTRY item, ACTION action)
63{
64	ENTRY *retval;
65
66	/* Create global hash table if needed. */
67	if (!global_hashtable_initialized) {
68		if (hcreate_r(0, &global_hashtable) == 0)
69			return (NULL);
70		global_hashtable_initialized = true;
71	}
72	if (hsearch_r(item, action, &retval, &global_hashtable) == 0)
73		return (NULL);
74	return (retval);
75}
76