/* Macros to swap the order of bytes in integer values. Copyright (C) 1997, 1998 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Library General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License for more details. You should have received a copy of the GNU Library General Public License along with the GNU C Library; see the file COPYING.LIB. If not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #if !defined _BYTESWAP_H && !defined _NETINET_IN_H # error "Never use <bits/byteswap.h> directly; include <byteswap.h> instead." #endif /* Swap bytes in 16 bit value. */ #ifdef __GNUC__ # define __bswap_16(x) \ (__extension__ \ ({ unsigned short int __bsx = (x); \ ((((__bsx) >> 8) & 0xff) | (((__bsx) & 0xff) << 8)); })) #else static __inline unsigned short int __bswap16 (unsigned short int x) { return ((((x) >> 8) & 0xff) | (((x) & 0xff) << 8)); } #endif /* Swap bytes in 32 bit value. */ #ifdef __GNUC__ # define __bswap_32(x) \ (__extension__ \ ({ unsigned int __bsx = (x); \ ((((__bsx) & 0xff000000) >> 24) | (((__bsx) & 0x00ff0000) >> 8) | \ (((__bsx) & 0x0000ff00) << 8) | (((__bsx) & 0x000000ff) << 24)); })) #else static __inline unsigned int __bswap32 (unsigned int x) { return ((((__bsx) & 0xff000000) >> 24) | (((__bsx) & 0x00ff0000) >> 8) | (((__bsx) & 0x0000ff00) << 8) | (((__bsx) & 0x000000ff) << 24)); } #endif #if defined __GNUC__ && __GNUC__ >= 2 /* Swap bytes in 64 bit value. */ # define __bswap_64(x) \ (__extension__ \ ({ union { unsigned long long int __ll; \ unsigned long int __l[2]; } __v, __r; \ __v.__ll = (x); \ __r.__l[0] = __bswap_32 (__v.__l[1]); \ __r.__l[1] = __bswap_32 (__v.__l[0]); \ __r.__ll; })) #endif