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swab - swap adjacent bytes
void swab(const void *from, void *to, size_t n);
The 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.
The swab() function returns no value.
SVID 3, BSD 4.3