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f5bebbbb MA |
1 | /* |
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 | ||
aafd7584 | 13 | #include "qemu/osdep.h" |
f5bebbbb MA |
14 | #include "qemu-common.h" |
15 | ||
16 | bool id_wellformed(const char *id) | |
17 | { | |
18 | int i; | |
19 | ||
20 | if (!qemu_isalpha(id[0])) { | |
21 | return false; | |
22 | } | |
23 | for (i = 1; id[i]; i++) { | |
24 | if (!qemu_isalnum(id[i]) && !strchr("-._", id[i])) { | |
25 | return false; | |
26 | } | |
27 | } | |
28 | return true; | |
29 | } | |
a0f19136 JC |
30 | |
31 | #define ID_SPECIAL_CHAR '#' | |
32 | ||
624533e5 | 33 | static const char *const id_subsys_str[ID_MAX] = { |
a0f19136 JC |
34 | [ID_QDEV] = "qdev", |
35 | [ID_BLOCK] = "block", | |
36 | }; | |
37 | ||
38 | /* | |
39 | * Generates an ID of the form PREFIX SUBSYSTEM NUMBER | |
40 | * where: | |
41 | * | |
42 | * - PREFIX is the reserved character '#' | |
43 | * - SUBSYSTEM identifies the subsystem creating the ID | |
44 | * - NUMBER is a decimal number unique within SUBSYSTEM. | |
45 | * | |
46 | * Example: "#block146" | |
47 | * | |
48 | * Note that these IDs do not satisfy id_wellformed(). | |
49 | * | |
50 | * The caller is responsible for freeing the returned string with g_free() | |
51 | */ | |
52 | char *id_generate(IdSubSystems id) | |
53 | { | |
54 | static uint64_t id_counters[ID_MAX]; | |
55 | uint32_t rnd; | |
56 | ||
624533e5 | 57 | assert(id < ARRAY_SIZE(id_subsys_str)); |
a0f19136 JC |
58 | assert(id_subsys_str[id]); |
59 | ||
60 | rnd = g_random_int_range(0, 100); | |
61 | ||
62 | return g_strdup_printf("%c%s%" PRIu64 "%02" PRId32, ID_SPECIAL_CHAR, | |
63 | id_subsys_str[id], | |
64 | id_counters[id]++, | |
65 | rnd); | |
66 | } |