Return 1 if string is ip address else 0

IsIpAddress.pwn

#if !defined IS_IN_RANGE
	#define IS_IN_RANGE(%0,%1,%2) (((%0) - ((%1) + cellmin)) < (((%2) + 1) - ((%1) + cellmin)))
#endif

stock IsIpAddress(const string[])
{
	new
		octet,
		j = 100;

	for (new i = 0; string[i] != '\0'; i++) {
		if (j != 0 && IS_IN_RANGE(string[i], '0', '9')) {
			octet += (string[i] - '0') * j;
			j /= 10;
		} else if (string[i] == '.') {
			if (IS_IN_RANGE(octet, 0, 255)) {
				j = 100;
				octet = 0;
			} else {
				return 0;
			}
		} else {
			return 0;
		}
	}
	return 1;
}