net.c
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net.c
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	// stub: minimal node:net implementation (isIP, isIPv4, isIPv6)
	// just enough for vite to resolve the module and validate hostnames

	#include <string.h>

	#ifdef _WIN32
	#include <winsock2.h>
	#include <ws2tcpip.h>
	#else
	#include <arpa/inet.h>
	#endif

	#include "ant.h"
	#include "internal.h" // IWYU pragma: keep

	static ant_value_t net_isIP(ant_t js, ant_value_t args, int nargs) {
	if (nargs < 1) return js_mknum(0);
	size_t len;
	const char *host = js_getstr(js, args[0], &len);
	if (!host) return js_mknum(0);

	struct in_addr addr4;
	struct in6_addr addr6;

	if (inet_pton(AF_INET, host, &addr4) == 1) return js_mknum(4);
	if (inet_pton(AF_INET6, host, &addr6) == 1) return js_mknum(6);
	return js_mknum(0);
	}

	static ant_value_t net_isIPv4(ant_t js, ant_value_t args, int nargs) {
	if (nargs < 1) return js_false;
	size_t len;
	const char *host = js_getstr(js, args[0], &len);
	if (!host) return js_false;

	struct in_addr addr;
	return inet_pton(AF_INET, host, &addr) == 1 ? js_true : js_false;
	}

	static ant_value_t net_isIPv6(ant_t js, ant_value_t args, int nargs) {
	if (nargs < 1) return js_false;
	size_t len;
	const char *host = js_getstr(js, args[0], &len);
	if (!host) return js_false;

	struct in6_addr addr;
	return inet_pton(AF_INET6, host, &addr) == 1 ? js_true : js_false;
	}

	ant_value_t net_library(ant_t *js) {
	ant_value_t lib = js_mkobj(js);

	js_set(js, lib, "isIP", js_mkfun(net_isIP));
	js_set(js, lib, "isIPv4", js_mkfun(net_isIPv4));
	js_set(js, lib, "isIPv6", js_mkfun(net_isIPv6));

	return lib;
	}