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