libc/sysdeps/linux/common/bits/byteswap-16.h

   1 /* Macros to swap the order of bytes in 16-bit integer values.
   2    Copyright (C) 2012-2016 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    <http://www.gnu.org/licenses/>.  */
  18
  19 #ifndef _BITS_BYTESWAP_H
  20 # error "Never use <bits/byteswap-16.h> directly; include <byteswap.h> instead."
  21 #endif
  22
  23 #ifdef __GNUC__
  24 # define __bswap_16(x) \
  25     (__extension__                                                            \
  26      ({ unsigned short int __bsx = (unsigned short int) (x);                  \
  27        __bswap_constant_16 (__bsx); }))
  28 #else
  29 static __inline unsigned short int
  30 __bswap_16 (unsigned short int __bsx)
  31 {
  32   return __bswap_constant_16 (__bsx);
  33 }
  34 #endif