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      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: head/lib/libc/stdlib/hcreate.c 292767 2015-12-27 07:50:11Z ed $");
     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 
     38 static struct hsearch_data global_hashtable;
     39 static bool global_hashtable_initialized = false;
     40 
     41 int
     42 hcreate(size_t nel)
     43 {
     44 
     45 	return (1);
     46 }
     47 
     48 void
     49 hdestroy(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 
     59 ENTRY *
     60 hsearch(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