common/mpls_bitfield.h

   1 /*
   2  *  Copyright (C) James R. Leu 2003
   3  *  jleu@mindspring.com
   4  *
   5  *  This software is covered under the LGPL, for more
   6  *  info check out http://www.gnu.org/copyleft/lgpl.html
   7  */
   8
   9 #ifndef MPLS_BITFIELD_H
  10 #define MPLS_BITFILED_H
  11
  12 #include <endian.h>
  13
  14 #if (__BYTE_ORDER == __LITTLE_ENDIAN)
  15 #define LITTLE_ENDIAN_BYTE_ORDER 1
  16 #endif
  17
  18 /* macros to handle different byte orders (little endian or big endian) */
  19 #ifdef LITTLE_ENDIAN_BYTE_ORDER
  20 #define BITFIELDS_ASCENDING_2(X, Y)                Y; X;
  21 #define BITFIELDS_ASCENDING_3(X, Y, Z)             Z; Y; X;
  22 #define BITFIELDS_ASCENDING_4(X, Y, Z, W)          W; Z; Y; X;
  23 #define BITFIELDS_ASCENDING_7(X, Y, Z, W, U, A, B) B; A; U; W; Z; Y; X;
  24 # else
  25 #define BITFIELDS_ASCENDING_2(X, Y)                X; Y;
  26 #define BITFIELDS_ASCENDING_3(X, Y, Z)             X; Y; Z;
  27 #define BITFIELDS_ASCENDING_4(X, Y, Z, W)          X; Y; Z; W;
  28 #define BITFIELDS_ASCENDING_7(X, Y, Z, W, U, A, B) X; Y; Z; W; U; A; B;
  29 #endif /* LITTLE_ENDIAN_BYTE_ORDER */
  30
  31 #endif