/* Description:
 *    Displays menu and waits for user input. Scroll with # and *, with wrap-around.
 * Parameters:
 *    items         - menu items
 *    items_sz      - menu items array's size
 *    upper         - maximum valid input choice (careful: 0 < 1, don't use for 10!)
 * Return value:
 *    char          - user's choice as an integer (0..9)
 */

char rollmenu(const char **items, char items_sz, char upper)
{
    char i = 0;
    char resp;

    for (;;)
    {
        puts(items[i]);
        resp = getchar();
        switch (resp)
        {
        case '*': // previous page
            i = (i + items_sz - 1) % items_sz;
            break;
        case '#': // next page
            i = (i + items_sz + 1) % items_sz;
            break;
        default:
            resp -= '0';
            if (resp <= upper)
            {
                return resp;
            }
            break;
        }
    }
}