src/protocols/icq/icqbyteorder.c

   1 /*
   2  * $Id: icqbyteorder.c 2096 2001-07-31 01:00:39Z warmenhoven $
   3  *
   4  * This header defines macros to handle ICQ protocol byte order conversion.
   5  *
   6  * Vadim Zaliva <lord@crocodile.org>
   7  * http://www.crocodile.org/
   8  *
   9  * Copyright (C) 1999 Vadim Zaliva
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  24  *
  25  */
  26
  27 /*
  28  * I am really trying to use builtin optimized byte swap routines.
  29  * they are highly optimised on some platforms.
  30  * But as last resort this simple code is used.
  31  */
  32
  33 #ifndef HAVE_BYTESWAP_H
  34 # ifndef bswap_32
  35 unsigned long bswap_32(unsigned long v)
  36 {
  37   unsigned char c,*x=(unsigned char *)&v;
  38   c=x[0];x[0]=x[3];x[3]=c;
  39   c=x[1];x[1]=x[2];x[2]=c;
  40   return v;
  41 }
  42 # endif
  43
  44 # ifndef bswap_16
  45 unsigned short bswap_16(unsigned short v)
  46 {
  47   unsigned char c,*x=(unsigned char *)&v;
  48   c=x[0];x[0]=x[1];x[1]=c;
  49   return v;
  50 }
  51 # endif
  52 #endif