Urgh, C strings suck

badstings.c

#include <string.h>
#include <stdio.h>


void printCanary(char * first, char * second)
{
        printf("Canaries[%c%c] [%c%c]\n", first[0], first[1], second[0], second[1]);
        memset(first, 'X', 2 * sizeof(*first));
        memset(first, 'Z', 2 * sizeof(*second));
}

int main(void)
{
        char padding[20]; // This is to prevent strcpy blowing away the stack!
        char canaryA[2] = { 'X', 'X' };
        char destination[5];
        char canaryB[2] = { 'Z', 'Z' };
        char * source = "STRINGS";

        printCanary(canaryA, canaryB);

        strcpy(destination, source);
        printf("Destination = '%s'\n", destination);
        printCanary(canaryA, canaryB);

        strncpy(destination, source, sizeof(destination));
        printf("Destination = '%s'\n", destination);
        printCanary(canaryA, canaryB);

        snprintf(destination, sizeof(destination), "%s",source);
        printf("Destination = '%s'\n", destination);
        printCanary(canaryA, canaryB);
        return 0;
}