NAME

       swab - swap adjacent bytes

LIBRARY

       Standard C library (libc, -lc)

SYNOPSIS

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

       void swab(const void from[restrict .n], void to[restrict .n],
                 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 │
       └───────────────────────────────────────────────────────────────┴───────────────┴─────────┘

STANDARDS

       POSIX.1-2008.

HISTORY

       POSIX.1-2001, SVr4, 4.3BSD.

SEE ALSO

       bstring(3)