raop_ntp: fix recv timeout + socket error handling in Windows

lib/compat.c

@@ -0,0 +1,36 @@
+
+/*
+ * Copyright (c) 2024 F. Duncanh, All Rights Reserved.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ *==================================================================
+ */
+
+#ifdef _WIN32
+#include <stdlib.h>
+#include <string.h>
+#include "compat.h"
+
+#define MAX_SOCKET_ERROR_MESSAGE_LENGTH 256
+
+/* Windows (winsock2) socket error message text */
+char *wsa_strerror(int errnum) {
+    static char message[MAX_SOCKET_ERROR_MESSAGE_LENGTH] = { 0 };
+    FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
+                  0, errnum, 0, message, sizeof(message), 0);
+    char *nl = strchr(message, '\n');
+    if (nl) {
+        *nl = 0;  /* remove any trailing newline, or truncate to one line */
+    }
+    return message;
+}
+#endif