string/byteswap.h

   1 /* Swap byte order for 16, 32 and 64 bit values
   2    Copyright (C) 1997-2023 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #ifndef _BYTESWAP_H
  20 #define _BYTESWAP_H     1
  21
  22 #include <features.h>
  23
  24 /* Get the machine specific, optimized definitions.  */
  25 #include <bits/byteswap.h>
  26
  27
  28 /* The following definitions must all be macros, otherwise some
  29    of the possible optimizations are not possible.  */
  30
  31 /* Return a value with both bytes in the 16 bit argument swapped.  */
  32 #define bswap_16(x) __bswap_16 (x)
  33
  34 /* Return a value with all bytes in the 32 bit argument swapped.  */
  35 #define bswap_32(x) __bswap_32 (x)
  36
  37 /* Return a value with all bytes in the 64 bit argument swapped.  */
  38 #define bswap_64(x) __bswap_64 (x)
  39
  40 #endif /* byteswap.h */