2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
5 * David L. Nugent. All rights reserved.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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.
16 * THIS SOFTWARE IS PROVIDED BY DAVID L. NUGENT AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL DAVID L. NUGENT OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 static const char rcsid[] =
43 int szmap = (size / 8) + !!(size % 8);
46 bm.map = malloc(szmap);
48 memset(bm.map, 0, szmap);
53 bm_dealloc(struct bitmap * bm)
59 bm_getmask(int *pos, unsigned char *bmask)
61 *bmask = (unsigned char) (1 << (*pos % 8));
66 bm_setbit(struct bitmap * bm, int pos)
70 bm_getmask(&pos, &bmask);
71 bm->map[pos] |= bmask;
75 bm_clrbit(struct bitmap * bm, int pos)
79 bm_getmask(&pos, &bmask);
80 bm->map[pos] &= ~bmask;
84 bm_isset(struct bitmap * bm, int pos)
88 bm_getmask(&pos, &bmask);
89 return !!(bm->map[pos] & bmask);
93 bm_firstunset(struct bitmap * bm)
95 int szmap = (bm->size / 8) + !!(bm->size % 8);
100 unsigned char bmv = bm->map[pos++];
101 unsigned char bmask = 1;
103 while (bmask & 0xff) {
104 if ((bmv & bmask) == 0)
114 bm_lastset(struct bitmap * bm)
116 int szmap = (bm->size / 8) + !!(bm->size % 8);
121 while (pos < szmap) {
122 unsigned char bmv = bm->map[pos++];
123 unsigned char bmask = 1;
125 while (bmask & 0xff) {
126 if ((bmv & bmask) != 0)