]>
git.cameronkatri.com Git - pw-darwin.git/blob - pw/bitmap.c
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
)
57 bm_getmask(int *pos
, unsigned char *bmask
)
59 *bmask
= (unsigned char) (1 << (*pos
% 8));
64 bm_setbit(struct bitmap
* bm
, int pos
)
68 bm_getmask(&pos
, &bmask
);
69 bm
->map
[pos
] |= bmask
;
73 bm_clrbit(struct bitmap
* bm
, int pos
)
77 bm_getmask(&pos
, &bmask
);
78 bm
->map
[pos
] &= ~bmask
;
82 bm_isset(struct bitmap
* bm
, int pos
)
86 bm_getmask(&pos
, &bmask
);
87 return !!(bm
->map
[pos
] & bmask
);
91 bm_firstunset(struct bitmap
* bm
)
93 int szmap
= (bm
->size
/ 8) + !!(bm
->size
% 8);
98 unsigned char bmv
= bm
->map
[pos
++];
99 unsigned char bmask
= 1;
101 while (bmask
& 0xff) {
102 if ((bmv
& bmask
) == 0)
112 bm_lastset(struct bitmap
* bm
)
114 int szmap
= (bm
->size
/ 8) + !!(bm
->size
% 8);
119 while (pos
< szmap
) {
120 unsigned char bmv
= bm
->map
[pos
++];
121 unsigned char bmask
= 1;
123 while (bmask
& 0xff) {
124 if ((bmv
& bmask
) != 0)