Fixed: Windows XP doesn't support inet_pton and inet_ntop

--HG--
branch : develop

code/nel/src/net/inet_address.cpp

@@ -30,6 +30,84 @@
 #	include <ws2ipdef.h>
 // for Windows 2000 compatibility
 #	include <wspiapi.h>
+
+#if !defined(NTDDI_VISTA) || (NTDDI_VERSION < NTDDI_VISTA)
+
+// inet_pton and inet_ntop not defined in winsock DLL before Vista
+
+// taken from http://stackoverflow.com/questions/13731243/what-is-the-windows-xp-equivalent-of-inet-pton-or-inetpton
+int inet_pton(int af, const char *src, void *dst)
+{
+	struct sockaddr_storage ss;
+	int size = sizeof(ss);
+	char src_copy[INET6_ADDRSTRLEN+1];
+
+	ZeroMemory(&ss, sizeof(ss));
+	// stupid non-const API
+	strncpy (src_copy, src, INET6_ADDRSTRLEN+1);
+	src_copy[INET6_ADDRSTRLEN] = 0;
+
+	if (WSAStringToAddress(src_copy, af, NULL, (struct sockaddr *)&ss, &size) == 0)
+	{
+		switch(af)
+		{
+			case AF_INET:
+			*(struct in_addr *)dst = ((struct sockaddr_in *)&ss)->sin_addr;
+			return 1;
+
+			case AF_INET6:
+			*(struct in6_addr *)dst = ((struct sockaddr_in6 *)&ss)->sin6_addr;
+			return 1;
+		}
+	}
+
+	return 0;
+}
+
+const char *inet_ntop(int af, const void *src, char *dst, socklen_t size)
+{
+	struct sockaddr_storage ss;
+	unsigned long s = size;
+
+	ZeroMemory(&ss, sizeof(ss));
+	ss.ss_family = af;
+
+	switch(af)
+	{
+		case AF_INET:
+		((struct sockaddr_in *)&ss)->sin_addr = *(struct in_addr *)src;
+		break;
+
+		case AF_INET6:
+		((struct sockaddr_in6 *)&ss)->sin6_addr = *(struct in6_addr *)src;
+		break;
+
+		default:
+		return NULL;
+	}
+	
+	// cannot directly use &size because of strict aliasing rules
+	return WSAAddressToString((struct sockaddr *)&ss, sizeof(ss), NULL, dst, &s) == 0 ? dst : NULL;
+}
+
+BOOLEAN IN6_IS_ADDR_UNSPECIFIED(CONST IN6_ADDR *a)
+{
+    //
+    // We can't use the in6addr_any variable, since that would
+    // require existing callers to link with a specific library.
+    //
+    return (BOOLEAN)((a->s6_words[0] == 0) &&
+                     (a->s6_words[1] == 0) &&
+                     (a->s6_words[2] == 0) &&
+                     (a->s6_words[3] == 0) &&
+                     (a->s6_words[4] == 0) &&
+                     (a->s6_words[5] == 0) &&
+                     (a->s6_words[6] == 0) &&
+                     (a->s6_words[7] == 0));
+}
+
+#endif
+
 #elif defined NL_OS_UNIX
 #	include <unistd.h>
 #	include <sys/socket.h>