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/*-
* SPDX-License-Identifier: BSD-2-Clause
* Copyright (c) 2024 rilysh <nightquick@proton.me>
*/
#include <unistd.h>
#include <sys/endian.h>
void
swab(const void * __restrict from, void * __restrict to, ssize_t len)
{
const uint16_t *f __aligned(1) = from;
uint16_t *t __aligned(1) = to;
/*
* POSIX says overlapping copy behavior is undefined, however many
* applications assume the old FreeBSD and current GNU libc behavior
* that will swap the bytes correctly when from == to. Reading both bytes
* and swapping them before writing them back accomplishes this.
*/
while (len > 1) {
*t++ = bswap16(*f++);
len -= 2;
}
}
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