2 * Copyright (c) 2008 Nicira Networks.
4 * Permission to use, copy, modify, and/or distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
24 #define BITMAP_ULONG_BITS (sizeof(unsigned long) * CHAR_BIT)
26 static inline unsigned long *
27 bitmap_unit__(const unsigned long *bitmap, size_t offset)
29 return (unsigned long *) &bitmap[offset / BITMAP_ULONG_BITS];
32 static inline unsigned long
33 bitmap_bit__(size_t offset)
35 return 1UL << (offset % BITMAP_ULONG_BITS);
38 static inline unsigned long *
39 bitmap_allocate(size_t n_bits)
41 return xcalloc(1, ROUND_UP(n_bits, BITMAP_ULONG_BITS));
45 bitmap_free(unsigned long *bitmap)
51 bitmap_is_set(const unsigned long *bitmap, size_t offset)
53 return (*bitmap_unit__(bitmap, offset) & bitmap_bit__(offset)) != 0;
57 bitmap_set1(unsigned long *bitmap, size_t offset)
59 *bitmap_unit__(bitmap, offset) |= bitmap_bit__(offset);
63 bitmap_set0(unsigned long *bitmap, size_t offset)
65 *bitmap_unit__(bitmap, offset) &= ~bitmap_bit__(offset);
69 bitmap_set(unsigned long *bitmap, size_t offset, bool value)
72 bitmap_set1(bitmap, offset);
74 bitmap_set0(bitmap, offset);
78 void bitmap_set_multiple(unsigned long *, size_t start, size_t count,
80 bool bitmap_equal(const unsigned long *, const unsigned long *, size_t n);