cleanup: protected -> hidden: cleanup symbol table
[babeltrace.git] / lib / registry.c
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1/*
2 * BabelTrace
3 *
4 * Format Registry
5 *
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6 * Copyright 2010-2011 EfficiOS Inc. and Linux Foundation
7 *
8 * Author: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
fc93b2bd 9 *
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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:
fc93b2bd 16 *
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17 * The above copyright notice and this permission notice shall be included in
18 * all copies or substantial portions of the Software.
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19 */
20
4c8bfb7e 21#include <babeltrace/format.h>
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22#include <glib.h>
23#include <errno.h>
7fb21036 24#include <stdio.h>
3122e6f0 25#include <assert.h>
fc93b2bd 26
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27struct walk_data {
28 FILE *fp;
29 int iter;
30};
31
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32static int init_done;
33void __attribute__((constructor)) format_init(void);
34void __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 */
41GHashTable *format_registry;
42
34861b9d 43struct format *bt_lookup_format(bt_intern_str name)
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44{
45 if (!init_done)
46 return NULL;
47 return g_hash_table_lookup(format_registry,
34861b9d 48 (gconstpointer) (unsigned long) name);
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49}
50
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51static void show_format(gpointer key, gpointer value, gpointer user_data)
52{
d2b8ea6b 53 struct walk_data *data = user_data;
7fb21036 54
d2b8ea6b 55 fprintf(data->fp, "%s%s", data->iter ? ", " : "",
7fb21036 56 g_quark_to_string((GQuark) (unsigned long) key));
d2b8ea6b 57 data->iter++;
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58}
59
60void bt_fprintf_format_list(FILE *fp)
61{
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62 struct walk_data data;
63
64 data.fp = fp;
65 data.iter = 0;
66
67 fprintf(fp, "Formats available: ");
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68 if (!init_done)
69 return;
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70 g_hash_table_foreach(format_registry, show_format, &data);
71 if (data.iter == 0)
72 fprintf(fp, "<none>");
73 fprintf(fp, ".\n");
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74}
75
4c8bfb7e 76int bt_register_format(struct format *format)
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77{
78 if (!init_done)
79 format_init();
80
4c8bfb7e 81 if (bt_lookup_format(format->name))
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82 return -EEXIST;
83
84 g_hash_table_insert(format_registry,
4c8bfb7e 85 (gpointer) (unsigned long) format->name,
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86 format);
87 return 0;
88}
89
90void format_init(void)
91{
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92 if (init_done)
93 return;
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94 format_registry = g_hash_table_new(g_direct_hash, g_direct_equal);
95 assert(format_registry);
96 init_done = 1;
97}
98
4c8bfb7e 99void format_finalize(void)
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100{
101 g_hash_table_destroy(format_registry);
102}
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