void swab(const void *from, void *to, ssize_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 dif-
ferent low/high byte ordering.
This function 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.)
The swab() function returns no value.
SVr4, 4.3BSD, POSIX.1-2001.
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