| SWAB(3) | Library Functions Manual | SWAB(3) | 
swab —
#include <unistd.h>
void
  
  swab(const
    void * restrict src, void
    * restrict dst, ssize_t
    len);
swab() copies len
  bytes from the location referenced by src to the
  location referenced by dst, swapping adjacent bytes.
If len is negative or zero,
    swab() does nothing. If len is
    odd, swab() copies len - 1
    bytes and the disposition of the last byte is unspecified.
swab() function conforms to IEEE
  Std 1003.1-2001 (“POSIX.1”).
swab() function appeared in
  Version 7 AT&T UNIX. It was originally
  documented to be “useful for carrying binary data between PDP11's and
  other machines”.
In NetBSD 6.0 the type of len was changed from size_t to ssize_t for POSIX compliance.
| April 30, 2010 | NetBSD 9.3 |