4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
27 /* Copyright (c) 1988 AT&T */
28 /* All Rights Reserved */
31 * Binary search algorithm, generalized from Knuth (6.2.1) Algorithm B.
34 #if !defined(_BOOT) && !defined(_KMDB)
36 #endif /* !_BOOT && !_KMDB */
39 #include <sys/types.h>
42 bsearch(const void *ky
, /* Key to be located */
43 const void *bs
, /* Beginning of table */
44 size_t nel
, /* Number of elements in the table */
45 size_t width
, /* Width of an element (bytes) */
46 int (*compar
)(const void *, const void *)) /* Comparison function */
50 char *last
; /* Last element in table */
56 two_width
= width
+ width
;
57 last
= base
+ width
* (nel
- 1);
59 while (last
>= base
) {
61 char *p
= base
+ width
* ((last
- base
)/two_width
);
62 int res
= (*compar
)(ky
, (void *)p
);
65 return (p
); /* Key found */
71 return (NULL
); /* Key not found */