Overflow examples

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

int main(int argc, char** argv)
{
    unsigned short int test_int = 1234;
    char *test_str = "abcd";


    struct
    {
        char overflooded[3];
        unsigned short int overwritten;
    } overflow_size;
    memset(&overflow_size, 0, sizeof(overflow_size));

    overflow_size.overwritten = test_int;
    strcpy(overflow_size.overflooded , test_str);

    printf("We should get: %s, %hu\n", test_str, test_int);
    printf("We get:        %s, %hu\n", overflow_size.overflooded, overflow_size.overwritten);


    struct
    {
        unsigned short int overflooded;
        char overwritten[4];
    } overflow_shift;
    memset(&overflow_shift, 0, sizeof(overflow_shift));

    unsigned short int *p_overflooded = &(overflow_shift.overflooded);
    p_overflooded++;

    strcpy(overflow_shift.overwritten, test_str);
    (*p_overflooded) = test_int;

    printf("We should get: %hu, %hu\n", test_int, test_int);
    printf("We get:        %hu, %s\n", overflow_shift.overflooded, overflow_shift.overwritten);


    int i;
    struct
    {
        char * overflooded[2];
        unsigned short int overwritten[2];
    } overflow_bounds;
    memset(&overflow_bounds, 0, sizeof(overflow_bounds));

    for (i=0; i<=2; i++)
        overflow_bounds.overwritten[i] = test_int;

    for (i=0; i<=2; i++)
        overflow_bounds.overflooded[i] = test_str;

    printf("We should get:\n");
    for (i=0; i<=2; i++)
        printf("  %s, %hu\n", test_str, test_int);

    printf("We get:\n");
    for (i=0; i<=2; i++)
        printf("  %s, %hu\n", overflow_bounds.overflooded[i], overflow_bounds.overwritten[i]);
}