string/byteswap.h

   1 /* Copyright (C) 1997 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #ifndef _BYTESWAP_H
  20 #define _BYTESWAP_H     1
  21
  22 /* Get the machine specific, optimized definitions.  */
  23 #include <bits/byteswap.h>
  24
  25
  26 /* The following definitions must all be macros since otherwise some
  27    of the possible optimizations are not possible.  */
  28
  29 /* Return a value with all bytes in the 16 bit argument swapped.  */
  30 #define bswap_16(x) __bswap_16 (x)
  31
  32 /* Return a value with all bytes in the 32 bit argument swapped.  */
  33 #define bswap_32(x) __bswap_32 (x)
  34
  35 #if defined __GNUC__ && __GNUC__ >= 2
  36 /* Return a value with all bytes in the 64 bit argument swapped.  */
  37 # define bswap_64(x) __bswap_64 (x)
  38 #endif
  39
  40 #endif /* byteswap.h */