libc.info: swab

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`swab'--swap adjacent bytes

*Synopsis*
     #include <unistd.h>
     void swab(const void *IN, void *OUT, ssize_t N);
   *Description*
This function copies N bytes from the memory region pointed to by IN to
the memory region pointed to by OUT, exchanging adjacent even and odd
bytes.
*Portability*
`swab' requires no supporting OS subroutines.