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### 5.40 `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.