swap adjacent bytes
_XOPEN_SOURCE /* See feature_test_macros(7) */
swab(const void *from, void *to,
swab() function copies n bytes from the array
pointed to by from to the array pointed to by
to, exchanging adjacent even and odd bytes. This
function is used to exchange data between machines that have
different low/high byte ordering.
does nothing when n is negative. When n is
positive and odd, it handles n−1 bytes as
above, and does something unspecified with the last byte.
(In other words, n should be even.)
swab() function returns no value.
explanation of the terms used in this section, see
POSIX.1-2008, SVr4, 4.3BSD.
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