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#include <unistd.h>

#include <sys/types.h>

#include <byteswap.h>

/* Updated implementation based on byteswap.h from Miles Bader

 * <miles@gnu.org>.  This should be much faster on arches with machine

 * specific, optimized definitions in include/bits/byteswap.h (i.e. on

 * x86, use the bswap instruction on i486 and better boxes).  For

 * platforms that lack such support, this should be no slower than it

 * was before... */

void swab (const void *source, void *dest, ssize_t count)

{

    const unsigned short *from = source, *from_end = from + (count >> 1);

    unsigned short junk;

    unsigned short *to = dest;

    while (from < from_end) {

        /* Don't put '*from++'into the bswap_16() macros

         * or mad things will happen on macro expansion */

        junk=*from++;

        *to++ = bswap_16 (junk);

    }

}