bswap(3) - Man pages

bswap(3)                   Library Functions Manual                   bswap(3)

NAME
       bswap_16, bswap_32, bswap_64 - reverse order of bytes

LIBRARY
       Standard C library (libc, -lc)

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  re-
       versed.

ERRORS
       These functions always succeed.

STANDARDS
       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 <byteswap.h>
       #include <inttypes.h>
       #include <stdint.h>
       #include <stdio.h>
       #include <stdlib.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 man-pages 6.03              2023-01-07                          bswap(3)

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