Fix: iterator set_pos
[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 return g_hash_table_lookup(format_registry,
48 (gconstpointer) (unsigned long) name);
49 }
50
51 static void show_format(gpointer key, gpointer value, gpointer user_data)
52 {
53 struct walk_data *data = user_data;
54
55 fprintf(data->fp, "%s%s", data->iter ? ", " : "",
56 g_quark_to_string((GQuark) (unsigned long) key));
57 data->iter++;
58 }
59
60 void bt_fprintf_format_list(FILE *fp)
61 {
62 struct walk_data data;
63
64 data.fp = fp;
65 data.iter = 0;
66
67 fprintf(fp, "Formats available: ");
68 if (!init_done)
69 return;
70 g_hash_table_foreach(format_registry, show_format, &data);
71 if (data.iter == 0)
72 fprintf(fp, "<none>");
73 fprintf(fp, ".\n");
74 }
75
76 int bt_register_format(struct format *format)
77 {
78 if (!init_done)
79 format_init();
80
81 if (bt_lookup_format(format->name))
82 return -EEXIST;
83
84 g_hash_table_insert(format_registry,
85 (gpointer) (unsigned long) format->name,
86 format);
87 return 0;
88 }
89
90 void format_init(void)
91 {
92 if (init_done)
93 return;
94 format_registry = g_hash_table_new(g_direct_hash, g_direct_equal);
95 assert(format_registry);
96 init_done = 1;
97 }
98
99 void format_finalize(void)
100 {
101 g_hash_table_destroy(format_registry);
102 }
This page took 0.044097 seconds and 4 git commands to generate.