| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * $Id: bitops.h,v 1.1 2002/10/19 17:56:50 mdw Exp $ |
| 4 | * |
| 5 | * Bit operations by truth table |
| 6 | * |
| 7 | * (c) 2002 Straylight/Edgeware |
| 8 | */ |
| 9 | |
| 10 | /*----- Licensing notice --------------------------------------------------* |
| 11 | * |
| 12 | * This file is part of Catacomb. |
| 13 | * |
| 14 | * Catacomb is free software; you can redistribute it and/or modify |
| 15 | * it under the terms of the GNU Library General Public License as |
| 16 | * published by the Free Software Foundation; either version 2 of the |
| 17 | * License, or (at your option) any later version. |
| 18 | * |
| 19 | * Catacomb is distributed in the hope that it will be useful, |
| 20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 22 | * GNU Library General Public License for more details. |
| 23 | * |
| 24 | * You should have received a copy of the GNU Library General Public |
| 25 | * License along with Catacomb; if not, write to the Free |
| 26 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
| 27 | * MA 02111-1307, USA. |
| 28 | */ |
| 29 | |
| 30 | /*----- Revision history --------------------------------------------------* |
| 31 | * |
| 32 | * $Log: bitops.h,v $ |
| 33 | * Revision 1.1 2002/10/19 17:56:50 mdw |
| 34 | * Fix bit operations. Test them (a bit) better. |
| 35 | * |
| 36 | */ |
| 37 | |
| 38 | #ifndef CATACOMB_BITOPS_H |
| 39 | #define CATACOMB_BITOPS_H |
| 40 | |
| 41 | #ifdef __cplusplus |
| 42 | extern "C" { |
| 43 | #endif |
| 44 | |
| 45 | /*----- Macros ------------------------------------------------------------*/ |
| 46 | |
| 47 | #define B0000(x, y) (0u) |
| 48 | #define B0001(x, y) ((x) & (y)) |
| 49 | #define B0010(x, y) ((x) & ~(y)) |
| 50 | #define B0011(x, y) (x) |
| 51 | #define B0100(x, y) (~(x) & (y)) |
| 52 | #define B0101(x, y) (y) |
| 53 | #define B0110(x, y) ((x) ^ (y)) |
| 54 | #define B0111(x, y) ((x) | (y)) |
| 55 | #define B1000(x, y) (~((x) | (y))) |
| 56 | #define B1001(x, y) (~((x) ^ (y))) |
| 57 | #define B1010(x, y) (~(y)) |
| 58 | #define B1011(x, y) ((x) | ~(y)) |
| 59 | #define B1100(x, y) (~(x)) |
| 60 | #define B1101(x, y) (~(x) | (y)) |
| 61 | #define B1110(x, y) (~((x) & (y))) |
| 62 | #define B1111(x, y) (~0u) |
| 63 | |
| 64 | /*----- That's all, folks -------------------------------------------------*/ |
| 65 | |
| 66 | #ifdef __cplusplus |
| 67 | } |
| 68 | #endif |
| 69 | |
| 70 | #endif |