#include <avr/io.h>
#include <string.h>

struct test_cases 
{
    char *s2;
    char *exp;
};

char s1[] = "abcdefg";

struct test_cases tc[] = {
    { "abc",        s1 },
    { "abfg",       NULL },
    { "abcdefg",    s1 },
    { "abcdefgh",   NULL },
    { "xczy",       NULL },
    { "def",        s1+3 },
    { "efg",        s1+4 },
    { "b",          s1+1 },
    { "g",          s1+6 },
    { "a",          s1 },
    { "x",          NULL },
    { "",           s1 },
    { NULL,         NULL }
};

int
main (void)
{
    unsigned char test_num = 0;

    struct test_cases *curr = tc;

    PORTB = 0xff;
    DDRB = 0xff;

    PORTD = 0xff;
    DDRD = 0xff;

    while (1)
    {
        if (curr->s2 == NULL)
        {
            break;
        }

        if (strstr (s1, curr->s2) == curr->exp)
            PORTB = test_num;  /* pass */
        else
            PORTD = test_num;  /* fail */

        test_num++;
        curr++;
    }

    return 0;
}