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

#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 4.15 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/.