/usr/include/byteswap.h is in libc6-dev 2.24-11+deb9u4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 | /* Copyright (C) 1997-2016 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 Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#ifndef _BYTESWAP_H
#define _BYTESWAP_H 1
#include <features.h>
/* Get the machine specific, optimized definitions. */
#include <bits/byteswap.h>
/* The following definitions must all be macros since otherwise some
of the possible optimizations are not possible. */
/* Return a value with all bytes in the 16 bit argument swapped. */
#define bswap_16(x) __bswap_16 (x)
/* Return a value with all bytes in the 32 bit argument swapped. */
#define bswap_32(x) __bswap_32 (x)
/* Return a value with all bytes in the 64 bit argument swapped. */
#define bswap_64(x) __bswap_64 (x)
#endif /* byteswap.h */
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