xref: /freebsd/lib/libc/stdlib/hcreate.c (revision a0b9e2e854027e6ff61fb075a1309dbc71c42b54)
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 
40 static struct hsearch_data global_hashtable;
41 static bool global_hashtable_initialized = false;
42 
43 int
44 hcreate(size_t nel)
45 {
46 
47 	return (1);
48 }
49 
50 void
51 hdestroy(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 
61 ENTRY *
62 hsearch(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