bswap(3) — Linux manual page

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | CONFORMING TO | EXAMPLES | SEE ALSO | COLOPHON

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

NAME         top

       bswap_16, bswap_32, bswap_64 - reverse order of bytes

SYNOPSIS         top

       #include <byteswap.h>

       bswap_16(x);
       bswap_32(x);
       bswap_64(x);

DESCRIPTION         top

       These macros return a value in which the order of the bytes in
       their 2-, 4-, or 8-byte arguments is reversed.

RETURN VALUE         top

       These macros return the value of their argument with the bytes
       reversed.

ERRORS         top

       These macros always succeed.

CONFORMING TO         top

       These macros are GNU extensions.

EXAMPLES         top

       The program below swaps the bytes of the 8-byte integer supplied
       as its command-line argument.  The following shell session
       demonstrates the use of the program:

           $ ./a.out 0x0123456789abcdef
           0x123456789abcdef ==> 0xefcdab8967452301

   Program source

       #include <stdio.h>
       #include <stdint.h>
       #include <stdlib.h>
       #include <inttypes.h>
       #include <byteswap.h>

       int
       main(int argc, char *argv[])
       {
           uint64_t x;

           if (argc != 2) {
               fprintf(stderr, "Usage: %s <num>\n", argv[0]);
               exit(EXIT_FAILURE);
           }

           x = strtoull(argv[1], NULL, 0);
           printf("%#" PRIx64 " ==> %#" PRIx64 "\n", x, bswap_64(x));

           exit(EXIT_SUCCESS);
       }

SEE ALSO         top

       byteorder(3), endian(3)

COLOPHON         top

       This page is part of release 5.10 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/.

Linux                          2020-11-01                       BSWAP(3)

Pages that refer to this page: byteorder(3)endian(3)