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swab(3)

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



NAME
       swab - swap adjacent bytes

SYNOPSIS
       #define _XOPEN_SOURCE       /* See feature_test_macros(7) */
       #include <unistd.h>

       void swab(const void *from, void *to, ssize_t n);

DESCRIPTION
       The swab() function copies n bytes from the array pointed to by from to
       the array pointed to by to, exchanging adjacent  even  and  odd  bytes.
       This  function is used to exchange data between machines that have dif‐
       ferent low/high byte ordering.

       This function does nothing when n is negative.  When n is positive  and
       odd, it handles n-1 bytes as above, and does something unspecified with
       the last byte.  (In other words, n should be even.)

RETURN VALUE
       The swab() function returns no value.

ATTRIBUTES
       For  an  explanation  of  the  terms  used   in   this   section,   see
       attributes(7).

       allbox;   lb   lb  lb  l  l  l.   Interface Attribute Value  T{  swab()
       T}   Thread safety  MT-Safe

CONFORMING TO
       POSIX.1-2001, POSIX.1-2008, SVr4, 4.3BSD.

SEE ALSO
       bstring(3)

COLOPHON
       This page is part of release 5.02 of the Linux  man-pages  project.   A
       description  of  the project, information about reporting bugs, and the
       latest    version    of    this    page,    can     be     found     at
       https://www.kernel.org/doc/man-pages/.



                                  2015-08-08                           SWAB(3)
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