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 *restrict from, void *restrict 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 different 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).

       ┌──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┬───────────────┬─────────┐
       │Interface                                                                                                                             │ Attribute     │ Value   │
       ├──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┼───────────────┼─────────┤
       │swab()                                                                                                                                │ Thread safety │ MT-Safe │
       └──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┴───────────────┴─────────┘

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

SEE ALSO
       bstring(3)

                                                                               2021-03-22                                                                        SWAB(3)