1 /* PSPP - a program for statistical analysis.
2 Copyright (C) 1997-9, 2000, 2019 Free Software Foundation, Inc.
3
4 This program is free software: you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation, either version 3 of the License, or
7 (at your option) any later version.
8
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
13
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <http://www.gnu.org/licenses/>. */
16
17 #ifndef BITVECTOR_H
18 #define BITVECTOR_H 1
19
20 #include <limits.h>
21 #include <stdbool.h>
22 #include <stddef.h>
23
24 enum { BITS_PER_ULONG = CHAR_BIT * sizeof (unsigned long int) };
25
26 unsigned long int *bitvector_allocate(size_t n);
27 size_t bitvector_count (const unsigned long int *, size_t);
28
29 static unsigned long int
bitvector_mask(size_t idx)30 bitvector_mask (size_t idx)
31 {
32 return 1UL << (idx % BITS_PER_ULONG);
33 }
34
35 static const unsigned long int *
bitvector_unit(const unsigned long int * vec,size_t idx)36 bitvector_unit (const unsigned long int *vec, size_t idx)
37 {
38 return &vec[idx / BITS_PER_ULONG];
39 }
40
41 static unsigned long int *
bitvector_unit_rw(unsigned long int * vec,size_t idx)42 bitvector_unit_rw (unsigned long int *vec, size_t idx)
43 {
44 return &vec[idx / BITS_PER_ULONG];
45 }
46
47 static inline void
bitvector_set1(unsigned long int * vec,size_t idx)48 bitvector_set1 (unsigned long int *vec, size_t idx)
49 {
50 *bitvector_unit_rw (vec, idx) |= bitvector_mask (idx);
51 }
52
53 static inline void
bitvector_set0(unsigned long int * vec,size_t idx)54 bitvector_set0 (unsigned long int *vec, size_t idx)
55 {
56 *bitvector_unit_rw (vec, idx) &= ~bitvector_mask (idx);
57 }
58
59 static inline bool
bitvector_is_set(const unsigned long int * vec,size_t idx)60 bitvector_is_set (const unsigned long int *vec, size_t idx)
61 {
62 return (*bitvector_unit (vec, idx) & bitvector_mask (idx)) != 0;
63 }
64
65 /* Returns 2**X, 0 <= X < 32. */
66 #define BIT_INDEX(X) (1ul << (X))
67
68 #endif /* bitvector.h */
69