1 /* PSPP - computes sample statistics.
2 Copyright (C) 1997-9, 2000 Free Software Foundation, Inc.
3 Written by Ben Pfaff <blp@gnu.org>.
5 This program is free software; you can redistribute it and/or
6 modify it under the terms of the GNU General Public License as
7 published by the Free Software Foundation; either version 2 of the
8 License, or (at your option) any later version.
10 This program is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
25 /* Sets bit Y starting at address X. */
26 #define SET_BIT(X, Y) \
27 (((unsigned char *) X)[(Y) / CHAR_BIT] |= 1 << ((Y) % CHAR_BIT))
29 /* Clears bit Y starting at address X. */
30 #define CLEAR_BIT(X, Y) \
31 (((unsigned char *) X)[(Y) / CHAR_BIT] &= ~(1 << ((Y) % CHAR_BIT)))
33 /* Sets bit Y starting at address X to Z, which is zero/nonzero */
34 #define SET_BIT_TO(X, Y, Z) \
35 ((Z) ? SET_BIT(X, Y) : CLEAR_BIT(X, Y))
37 /* Nonzero if bit Y starting at address X is set. */
38 #define TEST_BIT(X, Y) \
39 (((unsigned char *) X)[(Y) / CHAR_BIT] & (1 << ((Y) % CHAR_BIT)))
41 /* Returns 2**X, 0 <= X < 32. */
42 #define BIT_INDEX(X) (1ul << (X))
44 #endif /* bitvector.h */