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



NAME
       bswap_16, bswap_32, bswap_64 - reverse order of bytes

SYNOPSIS
       #include <byteswap.h>

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

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

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

ERRORS
       These macros always succeed.

CONFORMING TO
       These macros are GNU extensions.

EXAMPLE
       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
       byteorder(3), endian(3)

COLOPHON
       This  page  is  part of release 4.16 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)