| 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 | |
| 26 | struct walk_data { |
| 27 | FILE *fp; |
| 28 | int iter; |
| 29 | }; |
| 30 | |
| 31 | static int init_done; |
| 32 | void __attribute__((constructor)) format_init(void); |
| 33 | void __attribute__((destructor)) format_finalize(void); |
| 34 | |
| 35 | /* |
| 36 | * Format registry hash table contains the registered formats. Format |
| 37 | * registration is typically performed by a format plugin. |
| 38 | * TODO: support plugin unload (unregistration of formats). |
| 39 | */ |
| 40 | GHashTable *format_registry; |
| 41 | |
| 42 | struct format *bt_lookup_format(GQuark qname) |
| 43 | { |
| 44 | if (!init_done) |
| 45 | return NULL; |
| 46 | return g_hash_table_lookup(format_registry, |
| 47 | (gconstpointer) (unsigned long) qname); |
| 48 | } |
| 49 | |
| 50 | static void show_format(gpointer key, gpointer value, gpointer user_data) |
| 51 | { |
| 52 | struct walk_data *data = user_data; |
| 53 | |
| 54 | fprintf(data->fp, "%s%s", data->iter ? ", " : "", |
| 55 | g_quark_to_string((GQuark) (unsigned long) key)); |
| 56 | data->iter++; |
| 57 | } |
| 58 | |
| 59 | void bt_fprintf_format_list(FILE *fp) |
| 60 | { |
| 61 | struct walk_data data; |
| 62 | |
| 63 | data.fp = fp; |
| 64 | data.iter = 0; |
| 65 | |
| 66 | fprintf(fp, "Formats available: "); |
| 67 | if (!init_done) |
| 68 | return; |
| 69 | g_hash_table_foreach(format_registry, show_format, &data); |
| 70 | if (data.iter == 0) |
| 71 | fprintf(fp, "<none>"); |
| 72 | fprintf(fp, ".\n"); |
| 73 | } |
| 74 | |
| 75 | int bt_register_format(struct format *format) |
| 76 | { |
| 77 | if (!init_done) |
| 78 | format_init(); |
| 79 | |
| 80 | if (bt_lookup_format(format->name)) |
| 81 | return -EEXIST; |
| 82 | |
| 83 | g_hash_table_insert(format_registry, |
| 84 | (gpointer) (unsigned long) format->name, |
| 85 | format); |
| 86 | return 0; |
| 87 | } |
| 88 | |
| 89 | void format_init(void) |
| 90 | { |
| 91 | if (init_done) |
| 92 | return; |
| 93 | format_registry = g_hash_table_new(g_direct_hash, g_direct_equal); |
| 94 | assert(format_registry); |
| 95 | init_done = 1; |
| 96 | } |
| 97 | |
| 98 | void format_finalize(void) |
| 99 | { |
| 100 | g_hash_table_destroy(format_registry); |
| 101 | } |