inet/htons.c

   1 /* Copyright (C) 1993-2019 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 #include <netinet/in.h>
  19
  20 #undef  htons
  21 #undef  ntohs
  22
  23 uint16_t
  24 htons (uint16_t x)
  25 {
  26 #if BYTE_ORDER == BIG_ENDIAN
  27   return x;
  28 #elif BYTE_ORDER == LITTLE_ENDIAN
  29   return __bswap_16 (x);
  30 #else
  31 # error "What kind of system is this?"
  32 #endif
  33 }
  34 weak_alias (htons, ntohs)