2 * Dealing with identifiers
4 * Copyright (C) 2014 Red Hat, Inc.
7 * Markus Armbruster <armbru@redhat.com>,
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.
13 #include "qemu-common.h"
15 bool id_wellformed(const char *id
)
19 if (!qemu_isalpha(id
[0])) {
22 for (i
= 1; id
[i
]; i
++) {
23 if (!qemu_isalnum(id
[i
]) && !strchr("-._", id
[i
])) {
30 #define ID_SPECIAL_CHAR '#'
32 static const char *const id_subsys_str
[ID_MAX
] = {
38 * Generates an ID of the form PREFIX SUBSYSTEM NUMBER
41 * - PREFIX is the reserved character '#'
42 * - SUBSYSTEM identifies the subsystem creating the ID
43 * - NUMBER is a decimal number unique within SUBSYSTEM.
45 * Example: "#block146"
47 * Note that these IDs do not satisfy id_wellformed().
49 * The caller is responsible for freeing the returned string with g_free()
51 char *id_generate(IdSubSystems id
)
53 static uint64_t id_counters
[ID_MAX
];
56 assert(id
< ARRAY_SIZE(id_subsys_str
));
57 assert(id_subsys_str
[id
]);
59 rnd
= g_random_int_range(0, 100);
61 return g_strdup_printf("%c%s%" PRIu64
"%02" PRId32
, ID_SPECIAL_CHAR
,