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 swab()                  Swap Bytes

 #include   <stdlib.h>                   Required for declarations only

 void       swab(source,destination,n);
 char       *source;                     Data to be copied and swapped
 char       *destination;                Storage location for swapped data
 int        n;                           Number of bytes to copy

    swab() copies 'n' bytes from 'source' to 'destination', swapping each
    pair of adjacent bytes during the transfer.  ('n' should be even to
    allow for proper swapping.)  'swab' is primarily used to prepare
    binary data for transfer to another machine with a different byte
    order.

       Returns:     Nothing

   -------------------------------- Example ---------------------------------

    The following statements copy 512 bytes from one location to another,
    swapping each pair of adjacent bytes.

           #include <stdlib.h>

           char srce[512], dest[512];

           main()
           {
               swab(srce,dest,512);
           }