cleanup usage()
[babeltrace.git] / formats / registry.c
1 /*
2 * BabelTrace
3 *
4 * Format Registry
5 *
6 * Copyright 2010 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
7 *
8 * Permission is hereby granted, free of charge, to any person obtaining a copy
9 * of this software and associated documentation files (the "Software"), to deal
10 * in the Software without restriction, including without limitation the rights
11 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
12 * copies of the Software, and to permit persons to whom the Software is
13 * furnished to do so, subject to the following conditions:
14 *
15 * The above copyright notice and this permission notice shall be included in
16 * all copies or substantial portions of the Software.
17 */
18
19 #include <babeltrace/format.h>
20 #include <glib.h>
21 #include <errno.h>
22 #include <stdio.h>
23
24 static int init_done;
25 void __attribute__((constructor)) format_init(void);
26 void __attribute__((destructor)) format_finalize(void);
27
28 /*
29 * Format registry hash table contains the registered formats. Format
30 * registration is typically performed by a format plugin.
31 * TODO: support plugin unload (unregistration of formats).
32 */
33 GHashTable *format_registry;
34
35 struct format *bt_lookup_format(GQuark qname)
36 {
37 if (!init_done)
38 return NULL;
39 return g_hash_table_lookup(format_registry,
40 (gconstpointer) (unsigned long) qname);
41 }
42
43 static void show_format(gpointer key, gpointer value, gpointer user_data)
44 {
45 FILE *fp = user_data;
46
47 fprintf(fp, "format: %s\n",
48 g_quark_to_string((GQuark) (unsigned long) key));
49 }
50
51 void bt_fprintf_format_list(FILE *fp)
52 {
53 fprintf(fp, "Formats available:\n");
54 if (!init_done)
55 return;
56 g_hash_table_foreach(format_registry, show_format, fp);
57 fprintf(fp, "End of formats available.\n");
58 }
59
60 int bt_register_format(struct format *format)
61 {
62 if (!init_done)
63 format_init();
64
65 if (bt_lookup_format(format->name))
66 return -EEXIST;
67
68 g_hash_table_insert(format_registry,
69 (gpointer) (unsigned long) format->name,
70 format);
71 return 0;
72 }
73
74 void format_init(void)
75 {
76 if (init_done)
77 return;
78 format_registry = g_hash_table_new(g_direct_hash, g_direct_equal);
79 assert(format_registry);
80 init_done = 1;
81 }
82
83 void format_finalize(void)
84 {
85 g_hash_table_destroy(format_registry);
86 }
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