dbm/src/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. ***REMOVED*** - see
  17  *    ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change
  18  * 4. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 #if defined(LIBC_SCCS) && !defined(lint)
  36 static char sccsid[] = "@(#)hsearch.c   8.4 (Berkeley) 7/21/94";
  37 #endif /* LIBC_SCCS and not lint */
  38
  39 #include "watcomfx.h"
  40
  41 #ifndef macintosh
  42 #include <sys/types.h>
  43 #endif
  44
  45 #include <fcntl.h>
  46 #include <string.h>
  47
  48 #include "mcom_db.h"
  49 #include "hsearch.h"
  50
  51 static DB *dbp = NULL;
  52 static ENTRY retval;
  53
  54 extern int
  55 hcreate(uint nel)
  56 {
  57         HASHINFO info;
  58
  59         info.nelem = nel;
  60         info.bsize = 256;
  61         info.ffactor = 8;
  62         info.cachesize = 0;
  63         info.hash = NULL;
  64         info.lorder = 0;
  65         dbp = (DB *)__hash_open(NULL, O_CREAT | O_RDWR, 0600, &info, 0);
  66         return ((int)dbp);
  67 }
  68
  69 extern ENTRY *
  70 hsearch(ENTRY item, ACTION action)
  71 {
  72         DBT key, val;
  73         int status;
  74
  75         if (!dbp)
  76                 return (NULL);
  77         key.data = (uint8 *)item.key;
  78         key.size = strlen(item.key) + 1;
  79
  80         if (action == ENTER) {
  81                 val.data = (uint8 *)item.data;
  82                 val.size = strlen(item.data) + 1;
  83                 status = (dbp->put)(dbp, &key, &val, R_NOOVERWRITE);
  84                 if (status)
  85                         return (NULL);
  86         } else {
  87                 /* FIND */
  88                 status = (dbp->get)(dbp, &key, &val, 0);
  89                 if (status)
  90                         return (NULL);
  91                 else
  92                         item.data = (char *)val.data;
  93         }
  94         retval.key = item.key;
  95         retval.data = item.data;
  96         return (&retval);
  97 }
  98
  99 extern void
 100 hdestroy()
 101 {
 102         if (dbp) {
 103                 (void)(dbp->close)(dbp);
 104                 dbp = NULL;
 105         }
 106 }