1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 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 <search.h> 29 #include <stdbool.h> 30 #include <stddef.h> 31 32 /* 33 * Thread unsafe interface: use a single process-wide hash table and 34 * forward calls to *_r() functions. 35 */ 36 37 static struct hsearch_data global_hashtable; 38 static bool global_hashtable_initialized = false; 39 40 int 41 hcreate(size_t nel) 42 { 43 44 return (1); 45 } 46 47 void 48 hdestroy(void) 49 { 50 51 /* Destroy global hash table if present. */ 52 if (global_hashtable_initialized) { 53 hdestroy_r(&global_hashtable); 54 global_hashtable_initialized = false; 55 } 56 } 57 58 ENTRY * 59 hsearch(ENTRY item, ACTION action) 60 { 61 ENTRY *retval; 62 63 /* Create global hash table if needed. */ 64 if (!global_hashtable_initialized) { 65 if (hcreate_r(0, &global_hashtable) == 0) 66 return (NULL); 67 global_hashtable_initialized = true; 68 } 69 if (hsearch_r(item, action, &retval, &global_hashtable) == 0) 70 return (NULL); 71 return (retval); 72 } 73