/**
 * :author: Dan Buch (daniel.buch@gmail.com)
 */

#include <stdio.h>

void duff(register char *to, register char *from, register int count)
{
    register int n = (count + 7) / 8;
    switch (count % 8) {
        case 0: do { *to++ = *from++;
        case 7: *to++ = *from++;
        case 6: *to++ = *from++;
        case 5: *to++ = *from++;
        case 4: *to++ = *from++;
        case 3: *to++ = *from++;
        case 2: *to++ = *from++;
        case 1: *to++ = *from++;
        } while (--n > 0);
    }
}

int main()
{
    char * to = "dogs cats babies";
    char * from = "monkey hat pants";
    int i = 16;
    printf("to = %s\n", to);
    printf("from = %s\n", from);
    /* And here comes the segfault... */
    duff(to, from, i);
    printf("to = %s\n", to);
    printf("from = %s\n", from);
}

/* vim:filetype=c:fileencoding=utf-8
 */