ws2_32: Fix edge case for getaddrinfo in BSD and OSX.

dlls/ws2_32/socket.c

@@ -5466,6 +5466,9 @@ int WINAPI WS_getaddrinfo(LPCSTR nodename, LPCSTR servname, const struct WS_addr
     else
         node = nodename;
 
+    /* servname tweak required by OSX and BSD kernels */
+    if (servname && !servname[0]) servname = "0";
+
     if (hints) {
         punixhints = &unixhints;
 

dlls/ws2_32/tests/sock.c

@@ -5402,12 +5402,24 @@ static void test_GetAddrInfoW(void)
     pFreeAddrInfoW(result);
 
     result = NULL;
+    ret = pGetAddrInfoW(NULL, empty, NULL, &result);
+    ok(!ret, "GetAddrInfoW failed with %d\n", WSAGetLastError());
+    ok(result != NULL, "GetAddrInfoW failed\n");
+    pFreeAddrInfoW(result);
+
+    result = NULL;
     ret = pGetAddrInfoW(empty, zero, NULL, &result);
     ok(!ret, "GetAddrInfoW failed with %d\n", WSAGetLastError());
     ok(result != NULL, "GetAddrInfoW failed\n");
     pFreeAddrInfoW(result);
 
     result = NULL;
+    ret = pGetAddrInfoW(empty, empty, NULL, &result);
+    ok(!ret, "GetAddrInfoW failed with %d\n", WSAGetLastError());
+    ok(result != NULL, "GetAddrInfoW failed\n");
+    pFreeAddrInfoW(result);
+
+    result = NULL;
     ret = pGetAddrInfoW(localhost, NULL, NULL, &result);
     ok(!ret, "GetAddrInfoW failed with %d\n", WSAGetLastError());
     pFreeAddrInfoW(result);
@@ -5529,12 +5541,24 @@ static void test_getaddrinfo(void)
     pfreeaddrinfo(result);
 
     result = NULL;
+    ret = pgetaddrinfo(NULL, "", NULL, &result);
+    ok(!ret, "getaddrinfo failed with %d\n", WSAGetLastError());
+    ok(result != NULL, "getaddrinfo failed\n");
+    pfreeaddrinfo(result);
+
+    result = NULL;
     ret = pgetaddrinfo("", "0", NULL, &result);
     ok(!ret, "getaddrinfo failed with %d\n", WSAGetLastError());
     ok(result != NULL, "getaddrinfo failed\n");
     pfreeaddrinfo(result);
 
     result = NULL;
+    ret = pgetaddrinfo("", "", NULL, &result);
+    ok(!ret, "getaddrinfo failed with %d\n", WSAGetLastError());
+    ok(result != NULL, "getaddrinfo failed\n");
+    pfreeaddrinfo(result);
+
+    result = NULL;
     ret = pgetaddrinfo("localhost", NULL, NULL, &result);
     ok(!ret, "getaddrinfo failed with %d\n", WSAGetLastError());
     pfreeaddrinfo(result);