gistfile1.txt

#include <string.h>
#include <stdio.h>
static void
xcp(unsigned long *dst, const unsigned long *src, int top)
{
    for (int i = 0; i < top; i++) {
        dst[i] = src[i];
        printf("%zu\n", src[i]);
    }
}

#define X 6
unsigned int x(int top)
{
    unsigned int* bp;
    unsigned long a_d[12];
    union {
        unsigned long bn[X];
        unsigned int ui[X];
    } buf;
    memset(a_d, 0, sizeof(a_d));

    xcp(buf.bn, a_d + X, top - X);
    bp = buf.ui;
    return *bp;
}