addr/addr_hton.c

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00001 // Copyright 2006 Benedikt Böhm <hollow@gentoo.org>
00002 //
00003 // This program is free software; you can redistribute it and/or modify
00004 // it under the terms of the GNU General Public License as published by
00005 // the Free Software Foundation; either version 2 of the License, or
00006 // (at your option) any later version.
00007 //
00008 // This program is distributed in the hope that it will be useful,
00009 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00010 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00011 // GNU General Public License for more details.
00012 //
00013 // You should have received a copy of the GNU General Public License
00014 // along with this program; if not, write to the
00015 // Free Software Foundation, Inc.,
00016 // 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
00017 
00018 #include "addr.h"
00019 
00020 static inline
00021 int islitend(void) {
00022         int i = 0;
00023         ((char *)(&i))[0] = 1;
00024         return i == 1;
00025 }
00026 
00027 uint32_t addr_hton(uint32_t addr)
00028 {
00029         if (islitend())
00030                 return (addr >> 24) |
00031                        ((addr & 0xff0000) >> 8) |
00032                        ((addr & 0xff00  ) << 8) |
00033                        (addr << 24);
00034         else
00035                 return addr;
00036 }

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