zZzzZ. — /usr/include

Editing: byteswap.h

/* Swap byte order for 16, 32 and 64 bit values
   Copyright (C) 1997-2021 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
   <https://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, otherwise some
   of the possible optimizations are not possible.  */

/* Return a value with both 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 */