NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | CONFORMING TO | EXAMPLE | 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.

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

           exit(EXIT_SUCCESS);
       }

SEE ALSO         top

       byteorder(3), endian(3)

COLOPHON         top

       This page is part of release 4.14 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                            2017-09-15                         BSWAP(3)

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