cachepc-qemu

Fork of AMDESE/qemu with changes for cachepc side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-qemu
Log | Files | Refs | Submodules | LICENSE | sfeed.txt

id.c (1684B)

      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
     13#include "qemu/osdep.h"
     14#include "qemu/ctype.h"
     15#include "qemu/id.h"
     16
     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}
     31
     32#define ID_SPECIAL_CHAR '#'
     33
     34static const char *const id_subsys_str[ID_MAX] = {
     35    [ID_QDEV]  = "qdev",
     36    [ID_BLOCK] = "block",
     37    [ID_CHR] = "chr",
     38    [ID_NET] = "net",
     39};
     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
     60    assert(id < ARRAY_SIZE(id_subsys_str));
     61    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}