db.1.85/hash/hsearch.c

   1 /*-
   2  * Copyright (c) 1990, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Margo Seltzer.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *      This product includes software developed by the University of
  19  *      California, Berkeley and its contributors.
  20  * 4. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  */
  36
  37 #if defined(LIBC_SCCS) && !defined(lint)
  38 static char sccsid[] = "@(#)hsearch.c   8.4 (Berkeley) 7/21/94";
  39 #endif /* LIBC_SCCS and not lint */
  40
  41 #include <sys/types.h>
  42
  43 #include <fcntl.h>
  44 #include <string.h>
  45
  46 #include <db.h>
  47 #include "search.h"
  48
  49 static DB *dbp = NULL;
  50 static ENTRY retval;
  51
  52 extern int
  53 hcreate(nel)
  54         u_int nel;
  55 {
  56         HASHINFO info;
  57
  58         info.nelem = nel;
  59         info.bsize = 256;
  60         info.ffactor = 8;
  61         info.cachesize = 0;
  62         info.hash = NULL;
  63         info.lorder = 0;
  64         dbp = (DB *)__hash_open(NULL, O_CREAT | O_RDWR, 0600, &info, 0);
  65         return ((int)dbp);
  66 }
  67
  68 extern ENTRY *
  69 hsearch(item, action)
  70         ENTRY item;
  71         ACTION action;
  72 {
  73         DBT key, val;
  74         int status;
  75
  76         if (!dbp)
  77                 return (NULL);
  78         key.data = (u_char *)item.key;
  79         key.size = strlen(item.key) + 1;
  80
  81         if (action == ENTER) {
  82                 val.data = (u_char *)item.data;
  83                 val.size = strlen(item.data) + 1;
  84                 status = (dbp->put)(dbp, &key, &val, R_NOOVERWRITE);
  85                 if (status)
  86                         return (NULL);
  87         } else {
  88                 /* FIND */
  89                 status = (dbp->get)(dbp, &key, &val, 0);
  90                 if (status)
  91                         return (NULL);
  92                 else
  93                         item.data = (char *)val.data;
  94         }
  95         retval.key = item.key;
  96         retval.data = item.data;
  97         return (&retval);
  98 }
  99
 100 extern void
 101 hdestroy()
 102 {
 103         if (dbp) {
 104                 (void)(dbp->close)(dbp);
 105                 dbp = NULL;
 106         }
 107 }