git.distorted.org.uk Git - u/mdw/catacomb/blob - bitops.h

   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