Added new files resulting from directory restructuring.

[pspp] / src / libpspp / bit-vector.h

diff --git a/src/libpspp/bit-vector.h b/src/libpspp/bit-vector.h
new file mode 100644 (file)
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--- /dev/null
+++ b/src/libpspp/bit-vector.h
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+/* PSPP - computes sample statistics.
+   Copyright (C) 1997-9, 2000 Free Software Foundation, Inc.
+   Written by Ben Pfaff <blp@gnu.org>.
+
+   This program is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License as
+   published by the Free Software Foundation; either version 2 of the
+   License, or (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+   02110-1301, USA. */
+
+#if !bitvector_h
+#define bitvector_h 1
+
+#include <limits.h>
+
+/* Sets bit Y starting at address X. */
+#define SET_BIT(X, Y)                                  \
+       (((unsigned char *) X)[(Y) / CHAR_BIT] |= 1 << ((Y) % CHAR_BIT))
+
+/* Clears bit Y starting at address X. */
+#define CLEAR_BIT(X, Y)                                \
+       (((unsigned char *) X)[(Y) / CHAR_BIT] &= ~(1 << ((Y) % CHAR_BIT)))
+
+/* Sets bit Y starting at address X to Z, which is zero/nonzero */
+#define SET_BIT_TO(X, Y, Z)                    \
+       ((Z) ? SET_BIT(X, Y) : CLEAR_BIT(X, Y))
+
+/* Nonzero if bit Y starting at address X is set. */
+#define TEST_BIT(X, Y)                                         \
+       (((unsigned char *) X)[(Y) / CHAR_BIT] & (1 << ((Y) % CHAR_BIT)))
+
+/* Returns 2**X, 0 <= X < 32. */
+#define BIT_INDEX(X) (1ul << (X))
+
+#endif /* bitvector.h */