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

NAME
       bswap_16, bswap_32, bswap_64 - reverse order of bytes

SYNOPSIS
       #include <byteswap.h>

       uint16_t bswap_16(uint16_t x);
       uint32_t bswap_32(uint32_t x);
       uint64_t bswap_64(uint64_t x);

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

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

ERRORS
       These functions always succeed.

CONFORMING TO
       These functions are GNU extensions.

EXAMPLES
       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
       byteorder(3), endian(3)

Linux                                                                          2021-06-20                                                                       BSWAP(3)