C++ INT_BUFSIZE_BOUND函数代码示例

static char * ATTRIBUTE_WARN_UNUSED_RESULT
human_time (struct timespec t)
{
  /* STR must be at least this big, either because localtime_rz fails,
     or because the time zone is truly outlandish so that %z expands
     to a long string.  */
  enum { intmax_bufsize = INT_BUFSIZE_BOUND (intmax_t) };

  static char str[intmax_bufsize
                  + INT_STRLEN_BOUND (int) /* YYYY */
                  + 1 /* because YYYY might equal INT_MAX + 1900 */
                  + sizeof "-MM-DD HH:MM:SS.NNNNNNNNN +"];
  static timezone_t tz;
  if (!tz)
    tz = tzalloc (getenv ("TZ"));
  struct tm tm;
  int ns = t.tv_nsec;
  if (localtime_rz (tz, &t.tv_sec, &tm))
    nstrftime (str, sizeof str, "%Y-%m-%d %H:%M:%S.%N %z", &tm, tz, ns);
  else
    {
      char secbuf[INT_BUFSIZE_BOUND (intmax_t)];
      sprintf (str, "%s.%09d", timetostr (t.tv_sec, secbuf), ns);
    }
  return str;
}

int
main (int argc, char **argv)
{
  char limit[1 + MAX (INT_BUFSIZE_BOUND (intmax_t),
                      INT_BUFSIZE_BOUND (uintmax_t))];

  initialize_main (&argc, &argv);
  set_program_name (argv[0]);
  setlocale (LC_ALL, "");
  bindtextdomain (PACKAGE, LOCALEDIR);
  textdomain (PACKAGE);

  initialize_exit_failure (EXIT_FAILURE);
  atexit (close_stdout);

  parse_long_options (argc, argv, PROGRAM_NAME, PACKAGE_NAME, VERSION,
                      usage, AUTHORS, (char const *) NULL);

#define print_int(TYPE)                                                  \
  sprintf (limit + 1, "%"PRIuMAX, (uintmax_t) TYPE##_MAX);               \
  printf (#TYPE"_MAX=%s\n", limit + 1);                                  \
  printf (#TYPE"_OFLOW=%s\n", decimal_absval_add_one (limit));           \
  if (TYPE##_MIN)                                                        \
    {                                                                    \
      sprintf (limit + 1, "%"PRIdMAX, (intmax_t) TYPE##_MIN);            \
      printf (#TYPE"_MIN=%s\n", limit + 1);                              \
      printf (#TYPE"_UFLOW=%s\n", decimal_absval_add_one (limit));       \
    }

#define print_float(TYPE)                                                \
  printf (#TYPE"_MIN=%Le\n", (long double)TYPE##_MIN);                   \
  printf (#TYPE"_MAX=%Le\n", (long double)TYPE##_MAX);

  /* Variable sized ints */
  print_int (CHAR);
  print_int (SCHAR);
  print_int (UCHAR);
  print_int (SHRT);
  print_int (INT);
  print_int (UINT);
  print_int (LONG);
  print_int (ULONG);
  print_int (SIZE);
  print_int (SSIZE);
  print_int (TIME_T);
  print_int (UID_T);
  print_int (GID_T);
  print_int (PID_T);
  print_int (OFF_T);
  print_int (INTMAX);
  print_int (UINTMAX);

  /* Variable sized floats */
  print_float (FLT);
  print_float (DBL);
  print_float (LDBL);
}

static char *
mpz_get_str (char const *str, int base, mpz_t z)
{
  char buf[INT_BUFSIZE_BOUND (intmax_t)];
  (void) str; (void) base;
  return xstrdup (imaxtostr (z[0], buf));
}

static int
mpz_out_str (FILE *stream, int base, mpz_t z)
{
  char buf[INT_BUFSIZE_BOUND (intmax_t)];
  (void) base;
  return fputs (imaxtostr (z[0], buf), stream) != EOF;
}

static bool
check_sparse_region (struct tar_sparse_file *file, off_t beg, off_t end)
{
  if (!lseek_or_error (file, beg))
    return false;

  while (beg < end)
    {
      size_t bytes_read;
      size_t rdsize = BLOCKSIZE < end - beg ? BLOCKSIZE : end - beg;
      char diff_buffer[BLOCKSIZE];

      bytes_read = safe_read (file->fd, diff_buffer, rdsize);
      if (bytes_read == SAFE_READ_ERROR)
	{
          read_diag_details (file->stat_info->orig_file_name,
	                     beg,
			     rdsize);
	  return false;
	}
      if (!zero_block_p (diff_buffer, bytes_read))
	{
	  char begbuf[INT_BUFSIZE_BOUND (off_t)];
 	  report_difference (file->stat_info,
			     _("File fragment at %s is not a hole"),
			     offtostr (beg, begbuf));
	  return false;
	}

      beg += bytes_read;
    }
  return true;
}

int virPidFileWritePath(const char *pidfile,
                        pid_t pid)
{
    int rc;
    int fd;
    char pidstr[INT_BUFSIZE_BOUND(pid)];

    if ((fd = open(pidfile,
                   O_WRONLY | O_CREAT | O_TRUNC,
                   S_IRUSR | S_IWUSR)) < 0) {
        rc = -errno;
        goto cleanup;
    }

    snprintf(pidstr, sizeof(pidstr), "%lld", (long long) pid);

    if (safewrite(fd, pidstr, strlen(pidstr)) < 0) {
        rc = -errno;
        VIR_FORCE_CLOSE(fd);
        goto cleanup;
    }

    rc = 0;

cleanup:
    if (VIR_CLOSE(fd) < 0)
        rc = -errno;

    return rc;
}

static void
read_negative_num (FILE *fp, intmax_t min_val, intmax_t *pval)
{
  int c;
  size_t i;
  char buf[INT_BUFSIZE_BOUND (intmax_t)];
  char *ep;
  buf[0] = '-';

  for (i = 1; ISDIGIT (c = getc (fp)); i++)
    {
      if (i == sizeof buf - 1)
	FATAL_ERROR ((0, 0, _("Field too long while reading snapshot file")));
      buf[i] = c;
    }

  if (c < 0)
    {
      if (ferror (fp))
	FATAL_ERROR ((0, errno, _("Read error in snapshot file")));
      else
	FATAL_ERROR ((0, 0, _("Unexpected EOF in snapshot file")));
    }

  buf[i] = 0;
  errno = 0;
  *pval = strtoimax (buf, &ep, 10);
  if (c || errno || *pval < min_val)
    FATAL_ERROR ((0, errno, _("Unexpected field value in snapshot file")));
}

/* Read incremental snapshot format 2 */
static void
read_incr_db_2 (void)
{
  struct obstack stk;
  char offbuf[INT_BUFSIZE_BOUND (off_t)];

  obstack_init (&stk);

  read_timespec (listed_incremental_stream, &newer_mtime_option);

  for (;;)
    {
      intmax_t i;
      struct timespec mtime;
      dev_t dev;
      ino_t ino;
      bool nfs;
      char *name;
      char *content;
      size_t s;

      if (! read_num (listed_incremental_stream, "nfs", 0, 1, &i))
	return; /* Normal return */

      nfs = i;

      read_timespec (listed_incremental_stream, &mtime);

      if (! read_num (listed_incremental_stream, "dev",
		      TYPE_MINIMUM (dev_t), TYPE_MAXIMUM (dev_t), &i))
	break;
      dev = i;

      if (! read_num (listed_incremental_stream, "ino",
		      TYPE_MINIMUM (ino_t), TYPE_MAXIMUM (ino_t), &i))
	break;
      ino = i;

      if (read_obstack (listed_incremental_stream, &stk, &s))
	break;

      name = obstack_finish (&stk);

      while (read_obstack (listed_incremental_stream, &stk, &s) == 0 && s > 1)
	;
      if (getc (listed_incremental_stream) != 0)
	FATAL_ERROR ((0, 0, _("%s: byte %s: %s"),
		      quotearg_colon (listed_incremental_option),
		      offtostr (ftello (listed_incremental_stream), offbuf),
		      _("Missing record terminator")));

      content = obstack_finish (&stk);
      note_directory (name, mtime, dev, ino, nfs, false, content);
      obstack_free (&stk, content);
    }
  FATAL_ERROR ((0, 0, "%s: %s",
		quotearg_colon (listed_incremental_option),
		_("Unexpected EOF in snapshot file")));
}

extern char *
uid_to_name (uid_t uid)
{
    char buf[INT_BUFSIZE_BOUND (intmax_t)];
    struct passwd *pwd = getpwuid (uid);
    return xstrdup (pwd ? pwd->pw_name
                    : TYPE_SIGNED (uid_t) ? imaxtostr (uid, buf)
                    : umaxtostr (uid, buf));
}

extern char *
gid_to_name (gid_t gid)
{
    char buf[INT_BUFSIZE_BOUND (intmax_t)];
    struct group *grp = getgrgid (gid);
    return xstrdup (grp ? grp->gr_name
                    : TYPE_SIGNED (gid_t) ? imaxtostr (gid, buf)
                    : umaxtostr (gid, buf));
}

static char * ATTRIBUTE_WARN_UNUSED_RESULT
human_time (struct timespec t)
{
  static char str[MAX (INT_BUFSIZE_BOUND (intmax_t),
                       (INT_STRLEN_BOUND (int) /* YYYY */
                        + 1 /* because YYYY might equal INT_MAX + 1900 */
                        + sizeof "-MM-DD HH:MM:SS.NNNNNNNNN +ZZZZ"))];
  struct tm const *tm = localtime (&t.tv_sec);
  if (tm == NULL)
    return timetostr (t.tv_sec, str);
  nstrftime (str, sizeof str, "%Y-%m-%d %H:%M:%S.%N %z", tm, 0, t.tv_nsec);
  return str;
}

static void
out_of_range_header (char const *keyword, char const *value,
		     intmax_t minval, uintmax_t maxval)
{
  char minval_buf[INT_BUFSIZE_BOUND (intmax_t)];
  char maxval_buf[UINTMAX_STRSIZE_BOUND];
  char *minval_string = imaxtostr (minval, minval_buf);
  char *maxval_string = umaxtostr (maxval, maxval_buf);

  /* TRANSLATORS: The first %s is the pax extended header keyword
     (atime, gid, etc.).  */
  ERROR ((0, 0, _("Extended header %s=%s is out of range %s..%s"),
	  keyword, value, minval_string, maxval_string));
}

/*
 * Bridge parameters can be set via sysfs on newish kernels,
 * or by  ioctl on older kernels. Perhaps we could just use
 * ioctl for every kernel, but its not clear what the long
 * term lifespan of the ioctl interface is...
 */
static int virNetDevBridgeSet(const char *brname,
                              const char *paramname,  /* sysfs param name */
                              unsigned long value,    /* new value */
                              int fd,                 /* control socket */
                              struct ifreq *ifr)      /* pre-filled bridge name */
{
    char *path = NULL;
    int ret = -1;

    if (virAsprintf(&path, "%s/%s/bridge/%s", SYSFS_NET_DIR, brname, paramname) < 0) {
        virReportOOMError();
        return -1;
    }

    if (virFileExists(path)) {
        char valuestr[INT_BUFSIZE_BOUND(value)];
        snprintf(valuestr, sizeof(valuestr), "%lu", value);
        if (virFileWriteStr(path, valuestr, 0) < 0) {
            virReportSystemError(errno,
                                 _("Unable to set bridge %s %s"), brname, paramname);
            goto cleanup;
        }
    } else {
        unsigned long paramid;
        if (STREQ(paramname, "stp_state")) {
            paramid = BRCTL_SET_BRIDGE_STP_STATE;
        } else if (STREQ(paramname, "forward_delay")) {
            paramid = BRCTL_SET_BRIDGE_FORWARD_DELAY;
        } else {
            virReportSystemError(EINVAL,
                                 _("Unable to set bridge %s %s"), brname, paramname);
            goto cleanup;
        }
        unsigned long args[] = { paramid, value, 0, 0 };
        ifr->ifr_data = (char*)&args;
        if (ioctl(fd, SIOCDEVPRIVATE, ifr) < 0) {
            virReportSystemError(errno,
                                 _("Unable to set bridge %s %s"), brname, paramname);
            goto cleanup;
        }
    }

    ret = 0;
cleanup:
    VIR_FREE(path);
    return ret;
}

/* Return the positive decimal contents of the given
 * DIR/cpu%u/FILE, or -1 on error.  If MISSING_OK and the
 * file could not be found, return 1 instead of an error; this is
 * because some machines cannot hot-unplug cpu0, or because
 * hot-unplugging is disabled.  */
static int
virNodeGetCpuValue(const char *dir, unsigned int cpu, const char *file,
                   bool missing_ok)
{
    char *path;
    FILE *pathfp;
    int value = -1;
    char value_str[INT_BUFSIZE_BOUND(value)];
    char *tmp;

    if (virAsprintf(&path, "%s/cpu%u/%s", dir, cpu, file) < 0) {
        virReportOOMError();
        return -1;
    }

    pathfp = fopen(path, "r");
    if (pathfp == NULL) {
        if (missing_ok && errno == ENOENT)
            value = 1;
        else
            virReportSystemError(errno, _("cannot open %s"), path);
        goto cleanup;
    }

    if (fgets(value_str, sizeof(value_str), pathfp) == NULL) {
        virReportSystemError(errno, _("cannot read from %s"), path);
        goto cleanup;
    }
    if (virStrToLong_i(value_str, &tmp, 10, &value) < 0) {
        nodeReportError(VIR_ERR_INTERNAL_ERROR,
                        _("could not convert '%s' to an integer"),
                        value_str);
        goto cleanup;
    }

cleanup:
    VIR_FORCE_FCLOSE(pathfp);
    VIR_FREE(path);

    return value;
}

int virPidFileReadPath(const char *path,
                       pid_t *pid)
{
    int fd;
    int rc;
    ssize_t bytes;
    long long pid_value = 0;
    char pidstr[INT_BUFSIZE_BOUND(pid_value)];
    char *endptr = NULL;

    *pid = 0;

    if ((fd = open(path, O_RDONLY)) < 0) {
        rc = -errno;
        goto cleanup;
    }

    bytes = saferead(fd, pidstr, sizeof(pidstr));
    if (bytes < 0) {
        rc = -errno;
        VIR_FORCE_CLOSE(fd);
        goto cleanup;
    }
    pidstr[bytes] = '\0';

    if (virStrToLong_ll(pidstr, &endptr, 10, &pid_value) < 0 ||
        !(*endptr == '\0' || c_isspace(*endptr)) ||
        (pid_t) pid_value != pid_value) {
        rc = -1;
        goto cleanup;
    }

    *pid = pid_value;
    rc = 0;

cleanup:
    if (VIR_CLOSE(fd) < 0)
        rc = -errno;

    return rc;
}