3 * David L. Nugent. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY DAVID L. NUGENT AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL DAVID L. NUGENT OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 static const char rcsid[] =
41 int szmap = (size / 8) + !!(size % 8);
44 bm.map = malloc(szmap);
46 memset(bm.map, 0, szmap);
51 bm_dealloc(struct bitmap * bm)
58 bm_getmask(int *pos, unsigned char *bmask)
60 *bmask = (unsigned char) (1 << (*pos % 8));
65 bm_setbit(struct bitmap * bm, int pos)
69 bm_getmask(&pos, &bmask);
70 bm->map[pos] |= bmask;
74 bm_clrbit(struct bitmap * bm, int pos)
78 bm_getmask(&pos, &bmask);
79 bm->map[pos] &= ~bmask;
83 bm_isset(struct bitmap * bm, int pos)
87 bm_getmask(&pos, &bmask);
88 return !!(bm->map[pos] & bmask);
92 bm_firstunset(struct bitmap * bm)
94 int szmap = (bm->size / 8) + !!(bm->size % 8);
99 unsigned char bmv = bm->map[pos++];
100 unsigned char bmask = 1;
102 while (bmask & 0xff) {
103 if ((bmv & bmask) == 0)
113 bm_lastset(struct bitmap * bm)
115 int szmap = (bm->size / 8) + !!(bm->size % 8);
120 while (pos < szmap) {
121 unsigned char bmv = bm->map[pos++];
122 unsigned char bmask = 1;
124 while (bmask & 0xff) {
125 if ((bmv & bmask) != 0)