newlib/libc/search/hcreate.c

   1 /* $NetBSD: hcreate.c,v 1.2 2001/02/19 21:26:04 ross Exp $ */
   2
   3 /*
   4  * Copyright (c) 2001 Christopher G. Demetriou
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. The name of the author may not be used to endorse or promote products
  16  *    derived from this software without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28  *
  29  * <<Id: LICENSE_GC,v 1.1 2001/10/01 23:24:05 cgd Exp>>
  30  */
  31
  32 /*
  33  * hcreate() / hsearch() / hdestroy()
  34  *
  35  * SysV/XPG4 hash table functions.
  36  *
  37  * Implementation done based on NetBSD manual page and Solaris manual page,
  38  * plus my own personal experience about how they're supposed to work.
  39  *
  40  * I tried to look at Knuth (as cited by the Solaris manual page), but
  41  * nobody had a copy in the office, so...
  42  */
  43
  44 #include <sys/cdefs.h>
  45 #if 0
  46 #if defined(LIBC_SCCS) && !defined(lint)
  47 __RCSID("$NetBSD: hcreate.c,v 1.2 2001/02/19 21:26:04 ross Exp $");
  48 #endif /* LIBC_SCCS and not lint */
  49 #endif
  50
  51 #include <sys/types.h>
  52 #include <errno.h>
  53 #include <search.h>
  54 #include <stdlib.h>
  55 #include <string.h>
  56
  57 static struct hsearch_data htab;
  58
  59 int
  60 hcreate (size_t nel)
  61 {
  62   return hcreate_r (nel, &htab);
  63 }
  64
  65 void
  66 hdestroy (void)
  67 {
  68   hdestroy_r (&htab);
  69 }
  70
  71 ENTRY *
  72 hsearch (ENTRY item,
  73        ACTION action)
  74 {
  75   ENTRY *retval;
  76
  77   hsearch_r (item, action, &retval, &htab);
  78
  79   return retval;
  80 }