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 8.5 (Berkeley) 9/21/94";
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-int.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 | O_BINARY, 0600, &info, 0);
65 return (dbp != NULL);
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
hdestroy()101 hdestroy()
102 {
103 if (dbp) {
104 (void)(dbp->close)(dbp);
105 dbp = NULL;
106 }
107 }
108