ntohll: a macro for network to host byte conversion for 64 bits numbers.

ntohll.c

/*
            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
                    Version 2, December 2004

 Copyright (C) 2017 Mingwei Zhang <mingwei@mwzhang.com>

 Everyone is permitted to copy and distribute verbatim or modified
 copies of this license document, and changing it is allowed as long
 as the name is changed.

            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION

  0. You just DO WHAT THE FUCK YOU WANT TO.
*/

#include <stdio.h>
#include <ntsid.h>

#define htonll(x) ((((long long)htonl(x))<<32) + (htonl((x)>>32)))

int main() {
    long long a = 0x8877665544332211;
    long long b = ((long long)htonl(a))<<32;
    long long c = htonl(a>>32);
    long long d = (((long long)htonl(a))<<32) + (htonl(a>>32));

    printf("a     - 0x%llx\n", a);
    printf("b     - 0x%llx\n", b);
    printf("c     - 0x%llx\n", c);
    printf("b+c   - 0x%llx\n", b+c);
    printf("d     - 0x%llx\n", d);
    printf("macro - 0x%llx\n", htonll(a));
    return 0;
}