Movatterモバイル変換

swab(3) — Linux manual page

swab(3)                  Library Functions Manualswab(3)

NAME        top

       swab - swap adjacent bytes

LIBRARY        top

       Standard C library (libc,-lc)

SYNOPSIS        top

#define _XOPEN_SOURCE/* See feature_test_macros(7) */#include <unistd.h>void swab(ssize_t n;const voidfrom[restrictn], voidto[restrictn],ssize_tn);

DESCRIPTION        top

       Theswab() function copiesn bytes from the array pointed to byfrom to the array pointed to byto, 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 whenn is negative.  Whenn is positive       and odd, it handlesn-1 bytes as above, and does something       unspecified with the last byte.  (In other words,n should be       even.)

RETURN VALUE        top

       Theswab() function returns no value.

ATTRIBUTES        top

       For an explanation of the terms used in this section, seeattributes(7).       ┌──────────────────────────────────────┬───────────────┬─────────┐       │Interface│Attribute│Value│       ├──────────────────────────────────────┼───────────────┼─────────┤       │swab()                               │ Thread safety │ MT-Safe │       └──────────────────────────────────────┴───────────────┴─────────┘

STANDARDS        top

       POSIX.1-2008.

HISTORY        top

       POSIX.1-2001, SVr4, 4.3BSD.

SEE ALSO        top

bstring(3)

COLOPHON        top

       This page is part of theman-pages (Linux kernel and C library       user-space interface documentation) project.  Information about       the project can be found at        ⟨https://www.kernel.org/doc/man-pages/⟩.  If you have a bug report       for this manual page, see       ⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.       This page was obtained from the tarball man-pages-6.15.tar.gz       fetched from       ⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on       2025-08-11.  If you discover any rendering problems in this HTML       version of the page, or you believe there is a better or more up-       to-date source for the page, or you have corrections or       improvements to the information in this COLOPHON (which isnot       part of the original manual page), send a mail to       man-pages@man7.orgLinux man-pages 6.15            2025-06-28swab(3)

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

HTML rendering created 2025-09-06 byMichael Kerrisk, author ofThe Linux Programming Interface. For details of in-depthLinux/UNIX system programming training courses that I teach, lookhere. Hosting byjambit GmbH.