SWAB(3)                    POSIX Programmer's Manual                   SWAB(3)



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

NNAAMMEE
       swab -- swap bytes

SSYYNNOOPPSSIISS
       #include <unistd.h>

       void swab(const void *restrict _s_r_c, void *restrict _d_e_s_t,
           ssize_t _n_b_y_t_e_s);

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

RREETTUURRNN VVAALLUUEE
       None.

EERRRROORRSS
       No errors are defined.

       _T_h_e _f_o_l_l_o_w_i_n_g _s_e_c_t_i_o_n_s _a_r_e _i_n_f_o_r_m_a_t_i_v_e_.

EEXXAAMMPPLLEESS
       None.

AAPPPPLLIICCAATTIIOONN UUSSAAGGEE
       None.

RRAATTIIOONNAALLEE
       None.

FFUUTTUURREE DDIIRREECCTTIIOONNSS
       None.

SSEEEE AALLSSOO
       The Base Definitions volume of POSIX.1-2017, <<uunniissttdd..hh>>

CCOOPPYYRRIIGGHHTT
       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 .



IEEE/The Open Group                  2017                              SWAB(3)
