blob: ded41c5025e4a0a1c3422469ff723b91d8c210c2 [file] [log] [blame]
Markus Armbrusterf5bebbb2014-09-30 13:59:30 +02001/*
2 * Dealing with identifiers
3 *
4 * Copyright (C) 2014 Red Hat, Inc.
5 *
6 * Authors:
7 * Markus Armbruster <armbru@redhat.com>,
8 *
9 * This work is licensed under the terms of the GNU LGPL, version 2.1
10 * or later. See the COPYING.LIB file in the top-level directory.
11 */
12
Peter Maydellaafd7582016-01-29 17:49:55 +000013#include "qemu/osdep.h"
Markus Armbruster856dfd82019-05-23 16:35:06 +020014#include "qemu/ctype.h"
Veronia Bahaaf348b6d2016-03-20 19:16:19 +020015#include "qemu/id.h"
Markus Armbrusterf5bebbb2014-09-30 13:59:30 +020016
17bool id_wellformed(const char *id)
18{
19 int i;
20
21 if (!qemu_isalpha(id[0])) {
22 return false;
23 }
24 for (i = 1; id[i]; i++) {
25 if (!qemu_isalnum(id[i]) && !strchr("-._", id[i])) {
26 return false;
27 }
28 }
29 return true;
30}
Jeff Codya0f19132015-10-12 19:36:49 -040031
32#define ID_SPECIAL_CHAR '#'
33
John Snow624533e2015-11-25 16:03:37 -050034static const char *const id_subsys_str[ID_MAX] = {
Jeff Codya0f19132015-10-12 19:36:49 -040035 [ID_QDEV] = "qdev",
36 [ID_BLOCK] = "block",
Marc-André Lureau1e419ee2019-10-21 16:31:31 +020037 [ID_CHR] = "chr",
Thomas Huth27eb3722021-02-15 10:02:25 +010038 [ID_NET] = "net",
Jeff Codya0f19132015-10-12 19:36:49 -040039};
40
41/*
42 * Generates an ID of the form PREFIX SUBSYSTEM NUMBER
43 * where:
44 *
45 * - PREFIX is the reserved character '#'
46 * - SUBSYSTEM identifies the subsystem creating the ID
47 * - NUMBER is a decimal number unique within SUBSYSTEM.
48 *
49 * Example: "#block146"
50 *
51 * Note that these IDs do not satisfy id_wellformed().
52 *
53 * The caller is responsible for freeing the returned string with g_free()
54 */
55char *id_generate(IdSubSystems id)
56{
57 static uint64_t id_counters[ID_MAX];
58 uint32_t rnd;
59
John Snow624533e2015-11-25 16:03:37 -050060 assert(id < ARRAY_SIZE(id_subsys_str));
Jeff Codya0f19132015-10-12 19:36:49 -040061 assert(id_subsys_str[id]);
62
63 rnd = g_random_int_range(0, 100);
64
65 return g_strdup_printf("%c%s%" PRIu64 "%02" PRId32, ID_SPECIAL_CHAR,
66 id_subsys_str[id],
67 id_counters[id]++,
68 rnd);
69}