Get address from parametr and bind it - c

Question

Im trying to get address from parameter and later if some address was there, pass to bind(). I created some code but I still can't get address from parameter to variable adresa.
even printf("Zadana adresa %s\n", adresa); don't print anything.
What I'm doing wrong?
char adresa[255];
void checkParameters(int argc, char **argv)
{
if(argc < 2)
{
printf("Program spusten bez parametru\n");
}
strcpy("-", adresa);
int i = 0;
for(i = 1; i < argc; i++)
{
printf("%d, %d\n", argc, i);
if(strcmp("-h", argv[i]) == 0)
{
printf("Help");
exit(0);
}
else if(strcmp("-a", argv[i]) == 0)
{
if(argc > (i + 1))
{
if(strlen(argv[i + 1]) < 255)
{
//memset(adresa, '\0', sizeof(adresa));
strcpy(argv[i + 1], adresa);
printf("Zadana adresa %s\n", adresa);
i++;
continue;
}
else
{
printf("Adresa je prilis dlouha (> 255)\n");
exit(0);
}
}
else
{
printf("Parametry jsou ve spatnem tvaru\n");
}
}
else
{
printf("Parametry jsou ve spatnem tvaru\n");
exit(0);
}
}
}
int main(int argv, char **argc)
{
checkParameters(argv, argc);
int optval;
struct sockaddr_in addr;//, incoming_addr;
/* create socket */
sock = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP);
if (sock < 0)
{
err("socket()");
}
/* set reusable flag */
optval = 1;
setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &optval, sizeof(optval));
/* prepare inet address */
memset(&addr, 0, sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_port = htons(port);
if(strcmp(adresa, "-") == 0)
{
addr.sin_addr.s_addr = htonl(INADDR_ANY); /* listen on all interfaces */
}
else
{
addr.sin_addr.s_addr = htonl(adresa); /* listen on all interfaces */
}
if (bind(sock, (struct sockaddr*)&addr, sizeof(addr)) < 0)
{
err("bind");
}
for(;;)
{
}
return 0;
}