Merge branch 'master' into bindings/python
[babeltrace.git] / lib / registry.c
1 /*
2 * BabelTrace
3 *
4 * Format Registry
5 *
6 * Copyright 2010-2011 EfficiOS Inc. and Linux Foundation
7 *
8 * Author: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 *
10 * Permission is hereby granted, free of charge, to any person obtaining a copy
11 * of this software and associated documentation files (the "Software"), to deal
12 * in the Software without restriction, including without limitation the rights
13 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
14 * copies of the Software, and to permit persons to whom the Software is
15 * furnished to do so, subject to the following conditions:
16 *
17 * The above copyright notice and this permission notice shall be included in
18 * all copies or substantial portions of the Software.
19 */
20
21 #include <babeltrace/format.h>
22 #include <glib.h>
23 #include <errno.h>
24 #include <stdio.h>
25 #include <assert.h>
26
27 struct walk_data {
28 FILE *fp;
29 int iter;
30 };
31
32 static int init_done;
33 void __attribute__((constructor)) format_init(void);
34 void __attribute__((destructor)) format_finalize(void);
35
36 /*
37 * Format registry hash table contains the registered formats. Format
38 * registration is typically performed by a format plugin.
39 * TODO: support plugin unload (unregistration of formats).
40 */
41 GHashTable *format_registry;
42
43 struct format *bt_lookup_format(bt_intern_str name)
44 {
45 if (!init_done)
46 return NULL;
47
48 return g_hash_table_lookup(format_registry,
49 (gconstpointer) (unsigned long) name);
50 }
51
52 static void show_format(gpointer key, gpointer value, gpointer user_data)
53 {
54 struct walk_data *data = user_data;
55
56 fprintf(data->fp, "%s%s", data->iter ? ", " : "",
57 g_quark_to_string((GQuark) (unsigned long) key));
58 data->iter++;
59 }
60
61 void bt_fprintf_format_list(FILE *fp)
62 {
63 struct walk_data data;
64
65 assert(fp);
66
67 data.fp = fp;
68 data.iter = 0;
69
70 fprintf(fp, "Formats available: ");
71 if (!init_done)
72 return;
73 g_hash_table_foreach(format_registry, show_format, &data);
74 if (data.iter == 0)
75 fprintf(fp, "<none>");
76 fprintf(fp, ".\n");
77 }
78
79 int bt_register_format(struct format *format)
80 {
81 if (!format)
82 return -EINVAL;
83
84 if (!init_done)
85 format_init();
86
87 if (bt_lookup_format(format->name))
88 return -EEXIST;
89
90 g_hash_table_insert(format_registry,
91 (gpointer) (unsigned long) format->name,
92 format);
93 return 0;
94 }
95
96 void format_init(void)
97 {
98 if (init_done)
99 return;
100 format_registry = g_hash_table_new(g_direct_hash, g_direct_equal);
101 assert(format_registry);
102 init_done = 1;
103 }
104
105 void format_finalize(void)
106 {
107 g_hash_table_destroy(format_registry);
108 }
This page took 0.031571 seconds and 5 git commands to generate.