#include <stdio.h>

/* 31 March 2020, by R. Harmsen

   This is a wrapper around the library net/libmaxminddb by MaxMind.
   See https://www.maxmind.com/en/geolite2-commercial-redistribution

   All it does is find the country that belongs to the given IP address,
   either IPv4 or IPv6.

   Return value:
	0 on succes, non-zero otherwise
   ISO-country:
	This must be a character array of no less than three bytes.
	It will be populated with a null-terminated ISO 3166 country
	code (two characters, uppercase), or with "??" is not found.
   fperr: 
	optional parameter, if set to a valid, opened file handle,
	error message will be written (appended) there. If NULL,
	nothing is written

   23 Nov 2025: I no longer use Maxmind’s library and database, but
	online tools instead. For more explanations, see
	https://rudhar.com/sfreview/IP2cntry.htm
	The function interface remains the same.
 */
int IP2cntr (char *IPadress, char ISO_country[3], FILE *fperr);