/usr/msp430/include/endian.h is in msp430-libc 20120224-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* All rights reserved.
*
* This open source code was developed with funding from People Power Company
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the
* distribution.
* - Neither the name of the People Power Corporation nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* PEOPLE POWER CO. OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE
*
*/
#ifndef _ENDIAN_H_
#define _ENDIAN_H_
#define __LITTLE_ENDIAN 1234
#define __BIG_ENDIAN 4321
/* This is MSP430-libc. The MSP430 is little-endian.
* Unconditionally. */
#define __BYTE_ORDER __LITTLE_ENDIAN
#if _BSD_SOURCE
#include <bits/byteswap.h>
#define htobe16(_x) __bswap_16(_x)
#define htole16(_x) (_x)
#define be16toh(_x) __bswap_16(_x)
#define le16toh(_x) (_x)
#define htobe32(_x) __bswap_32(_x)
#define htole32(_x) (_x)
#define be32toh(_x) __bswap_32(_x)
#define le32toh(_x) (_x)
#define htobe64(_x) __bswap_64(_x)
#define htole64(_x) (_x)
#define be64toh(_x) __bswap_64(_x)
#define le64toh(_x) (_x)
#endif /* _BSD_SOURCE */
#endif /* _ENDIAN_H_ */
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