fix: move read event from iterator to event.h

[babeltrace.git] / lib / registry.c

diff --git a/lib/registry.c b/lib/registry.c
new file mode 100644 (file)
index 0000000..829ede9
--- /dev/null
+++ b/lib/registry.c
@@ -0,0 +1,102 @@
+/*
+ * BabelTrace
+ *
+ * Format Registry
+ *
+ * Copyright 2010-2011 EfficiOS Inc. and Linux Foundation
+ *
+ * Author: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ */
+
+#include <babeltrace/format.h>
+#include <glib.h>
+#include <errno.h>
+#include <stdio.h>
+#include <assert.h>
+
+struct walk_data {
+       FILE *fp;
+       int iter;
+};
+
+static int init_done;
+void __attribute__((constructor)) format_init(void);
+void __attribute__((destructor)) format_finalize(void);
+
+/*
+ * Format registry hash table contains the registered formats. Format
+ * registration is typically performed by a format plugin.
+ * TODO: support plugin unload (unregistration of formats).
+ */
+GHashTable *format_registry;
+
+struct format *bt_lookup_format(bt_intern_str name)
+{
+       if (!init_done)
+               return NULL;
+       return g_hash_table_lookup(format_registry,
+                                  (gconstpointer) (unsigned long) name);
+}
+
+static void show_format(gpointer key, gpointer value, gpointer user_data)
+{
+       struct walk_data *data = user_data;
+
+       fprintf(data->fp, "%s%s", data->iter ? ", " : "",
+               g_quark_to_string((GQuark) (unsigned long) key));
+       data->iter++;
+}
+
+void bt_fprintf_format_list(FILE *fp)
+{
+       struct walk_data data;
+
+       data.fp = fp;
+       data.iter = 0;
+
+       fprintf(fp, "Formats available: ");
+       if (!init_done)
+               return;
+       g_hash_table_foreach(format_registry, show_format, &data);
+       if (data.iter == 0)
+               fprintf(fp, "<none>");
+       fprintf(fp, ".\n");
+}
+
+int bt_register_format(struct format *format)
+{
+       if (!init_done)
+               format_init();
+
+       if (bt_lookup_format(format->name))
+               return -EEXIST;
+
+       g_hash_table_insert(format_registry,
+                           (gpointer) (unsigned long) format->name,
+                           format);
+       return 0;
+}
+
+void format_init(void)
+{
+       if (init_done)
+               return;
+       format_registry = g_hash_table_new(g_direct_hash, g_direct_equal);
+       assert(format_registry);
+       init_done = 1;
+}
+
+void format_finalize(void)
+{
+       g_hash_table_destroy(format_registry);
+}