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70 lines
1.6 KiB
C
70 lines
1.6 KiB
C
/*
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* Dealing with identifiers
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*
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* Copyright (C) 2014 Red Hat, Inc.
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*
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* Authors:
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* Markus Armbruster <armbru@redhat.com>,
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*
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* This work is licensed under the terms of the GNU LGPL, version 2.1
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* or later. See the COPYING.LIB file in the top-level directory.
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*/
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#include "qemu/osdep.h"
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#include "qemu/ctype.h"
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#include "qemu/id.h"
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bool id_wellformed(const char *id)
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{
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int i;
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if (!qemu_isalpha(id[0])) {
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return false;
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}
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for (i = 1; id[i]; i++) {
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if (!qemu_isalnum(id[i]) && !strchr("-._", id[i])) {
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return false;
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}
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}
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return true;
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}
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#define ID_SPECIAL_CHAR '#'
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static const char *const id_subsys_str[ID_MAX] = {
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[ID_QDEV] = "qdev",
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[ID_BLOCK] = "block",
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[ID_CHR] = "chr",
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[ID_NET] = "net",
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};
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/*
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* Generates an ID of the form PREFIX SUBSYSTEM NUMBER
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* where:
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*
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* - PREFIX is the reserved character '#'
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* - SUBSYSTEM identifies the subsystem creating the ID
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* - NUMBER is a decimal number unique within SUBSYSTEM.
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*
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* Example: "#block146"
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*
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* Note that these IDs do not satisfy id_wellformed().
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*
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* The caller is responsible for freeing the returned string with g_free()
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*/
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char *id_generate(IdSubSystems id)
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{
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static uint64_t id_counters[ID_MAX];
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uint32_t rnd;
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assert(id < ARRAY_SIZE(id_subsys_str));
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assert(id_subsys_str[id]);
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rnd = g_random_int_range(0, 100);
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return g_strdup_printf("%c%s%" PRIu64 "%02" PRId32, ID_SPECIAL_CHAR,
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id_subsys_str[id],
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id_counters[id]++,
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rnd);
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}
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