protocol: support client-to-client communication

src/client_message.c

@@ -0,0 +1,96 @@
+/*
+ * Copyright (C) 2003-2011 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "client_message.h"
+
+#include <assert.h>
+#include <glib.h>
+
+G_GNUC_PURE
+static bool
+valid_channel_char(const char ch)
+{
+	return g_ascii_isalnum(ch) ||
+		ch == '_' || ch == '-' || ch == '.' || ch == ':';
+}
+
+bool
+client_message_valid_channel_name(const char *name)
+{
+	do {
+		if (!valid_channel_char(*name))
+			return false;
+	} while (*++name != 0);
+
+	return true;
+}
+
+void
+client_message_init_null(struct client_message *msg)
+{
+	assert(msg != NULL);
+
+	msg->channel = NULL;
+	msg->message = NULL;
+}
+
+void
+client_message_init(struct client_message *msg,
+		    const char *channel, const char *message)
+{
+	assert(msg != NULL);
+
+	msg->channel = g_strdup(channel);
+	msg->message = g_strdup(message);
+}
+
+void
+client_message_copy(struct client_message *dest,
+		    const struct client_message *src)
+{
+	assert(dest != NULL);
+	assert(src != NULL);
+	assert(client_message_defined(src));
+
+	client_message_init(dest, src->channel, src->message);
+}
+
+struct client_message *
+client_message_dup(const struct client_message *src)
+{
+	struct client_message *dest = g_slice_new(struct client_message);
+	client_message_copy(dest, src);
+	return dest;
+}
+
+void
+client_message_deinit(struct client_message *msg)
+{
+	assert(msg != NULL);
+
+	g_free(msg->channel);
+	g_free(msg->message);
+}
+
+void
+client_message_free(struct client_message *msg)
+{
+	client_message_deinit(msg);
+	g_slice_free(struct client_message, msg);
+}