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, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #ifndef _BYTESWAP_H
  19 #define _BYTESWAP_H     1
  20
  21 /* Get the machine specific, optimized definitions.  */
  22 #include <bits/byteswap.h>
  23
  24
  25 /* The following definitions must all be macros since otherwise some
  26    of the possible optimizations are not possible.  */
  27
  28 /* Return a value with all bytes in the 16 bit argument swapped.  */
  29 #define bswap_16(x) __bswap_16 (x)
  30
  31 /* Return a value with all bytes in the 32 bit argument swapped.  */
  32 #define bswap_32(x) __bswap_32 (x)
  33
  34 #if defined __GNUC__ && __GNUC__ >= 2
  35 /* Return a value with all bytes in the 64 bit argument swapped.  */
  36 # define bswap_64(x) __bswap_64 (x)
  37 #endif
  38
  39 #endif /* byteswap.h */