swab(3) — Linux manual page

swab(3)                 Library Functions Manual                 swab(3)

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)

COLOPHON

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Linux man-pages 6.9.1          2024-05-02                        swab(3)

Pages that refer to this page: bzero(3), memset(3)

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