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PROLOG
       This  manual  page  is part of the POSIX Programmer's Manual.  The Linux implementation of
       this interface may differ (consult the corresponding Linux  manual  page  for  details  of
       Linux behavior), or the interface may not be implemented on Linux.


NAME
       swab — swap bytes


SYNOPSIS
       #include <unistd.h>

       void swab(const void *restrict src, void *restrict dest,
           ssize_t nbytes);


DESCRIPTION
       The  swab()  function  shall copy nbytes bytes, which are pointed to by src, to the object
       pointed to by dest, exchanging adjacent bytes. The nbytes  argument  should  be  even.  If
       nbytes  is odd, swab() copies and exchanges nbytes-1 bytes and the disposition of the last
       byte is unspecified. If copying takes place between objects that overlap, the behavior  is
       undefined.  If nbytes is negative, swab() does nothing.


RETURN VALUE
       None.


ERRORS
       No errors are defined.

       The following sections are informative.


EXAMPLES
       None.


APPLICATION USAGE
       None.


RATIONALE
       None.


FUTURE DIRECTIONS
       None.


SEE ALSO
       The Base Definitions volume of POSIX.1‐2017, <unistd.h>


COPYRIGHT
       Portions  of  this  text  are  reprinted  and  reproduced in electronic form from IEEE Std
       1003.1-2017, Standard for Information Technology -- Portable  Operating  System  Interface
       (POSIX),  The  Open Group Base Specifications Issue 7, 2018 Edition, Copyright (C) 2018 by
       the Institute of Electrical and Electronics Engineers, Inc and The  Open  Group.   In  the
       event  of  any  discrepancy  between this version and the original IEEE and The Open Group
       Standard, the original IEEE and The Open Group  Standard  is  the  referee  document.  The
       original Standard can be obtained online at http://www.opengroup.org/unix/online.html .

       Any  typographical  or  formatting errors that appear in this page are most likely to have
       been introduced during the conversion of the source files to man page  format.  To  report
       such errors, see https://www.kernel.org/doc/man-pages/reporting_bugs.html .