shared: add also "shared/nm-utils/nm-vpn-plugin-macros.h"

It has the very similar purpose as "nm-utils/nm-vpn-plugin-utils.[ch]", except
that is is header-only.

(cherry picked from commit af507cd089)

shared/Makefile.am

@@ -10,6 +10,7 @@ EXTRA_DIST = \
      nm-test-libnm-utils.h \
      nm-test-utils.h \
      nm-test-utils-impl.c \
-     nm-version-macros.h.in
+     nm-version-macros.h.in \
+     nm-vpn-plugin-macros.h
 
 CLEANFILES=nm-version.h

shared/nm-vpn-plugin-macros.h

@@ -0,0 +1,43 @@
+/* -*- Mode: C; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4 -*- */
+
+/*
+ * 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 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.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301 USA.
+ *
+ * Copyright 2016 Red Hat, Inc.
+ */
+
+#ifndef __NM_VPN_PLUGIN_MACROS_H__
+#define __NM_VPN_PLUGIN_MACROS_H__
+
+#include <syslog.h>
+
+static inline const char *
+nm_utils_syslog_to_str (int syslog_level)
+{
+	/* Maps the levels the same way as NetworkManager's nm-logging.c does */
+	if (syslog_level >= LOG_DEBUG)
+		return "<trace>";
+	if (syslog_level >= LOG_INFO)
+		return "<debug>";
+	if (syslog_level >= LOG_NOTICE)
+		return "<info>";
+	if (syslog_level >= LOG_WARNING)
+		return "<warn>";
+	return "<error>";
+}
+
+#endif /* __NM_VPN_PLUGIN_MACROS_H__ */
+