Prettify 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 struct walk_data {
25 FILE *fp;
26 int iter;
27 };
28
29 static int init_done;
30 void __attribute__((constructor)) format_init(void);
31 void __attribute__((destructor)) format_finalize(void);
32
33 /*
34 * Format registry hash table contains the registered formats. Format
35 * registration is typically performed by a format plugin.
36 * TODO: support plugin unload (unregistration of formats).
37 */
38 GHashTable *format_registry;
39
40 struct format *bt_lookup_format(GQuark qname)
41 {
42 if (!init_done)
43 return NULL;
44 return g_hash_table_lookup(format_registry,
45 (gconstpointer) (unsigned long) qname);
46 }
47
48 static void show_format(gpointer key, gpointer value, gpointer user_data)
49 {
50 struct walk_data *data = user_data;
51
52 fprintf(data->fp, "%s%s", data->iter ? ", " : "",
53 g_quark_to_string((GQuark) (unsigned long) key));
54 data->iter++;
55 }
56
57 void bt_fprintf_format_list(FILE *fp)
58 {
59 struct walk_data data;
60
61 data.fp = fp;
62 data.iter = 0;
63
64 fprintf(fp, "Formats available: ");
65 if (!init_done)
66 return;
67 g_hash_table_foreach(format_registry, show_format, &data);
68 if (data.iter == 0)
69 fprintf(fp, "<none>");
70 fprintf(fp, ".\n");
71 }
72
73 int bt_register_format(struct format *format)
74 {
75 if (!init_done)
76 format_init();
77
78 if (bt_lookup_format(format->name))
79 return -EEXIST;
80
81 g_hash_table_insert(format_registry,
82 (gpointer) (unsigned long) format->name,
83 format);
84 return 0;
85 }
86
87 void format_init(void)
88 {
89 if (init_done)
90 return;
91 format_registry = g_hash_table_new(g_direct_hash, g_direct_equal);
92 assert(format_registry);
93 init_done = 1;
94 }
95
96 void format_finalize(void)
97 {
98 g_hash_table_destroy(format_registry);
99 }
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