void
write_directory_file (void)
{
FILE *fp = listed_incremental_stream;
char buf[UINTMAX_STRSIZE_BOUND];
char *s;
if (! fp)
return;
if (fseeko (fp, 0L, SEEK_SET) != 0)
seek_error (listed_incremental_option);
if (sys_truncate (fileno (fp)) != 0)
truncate_error (listed_incremental_option);
fprintf (fp, "%s-%s-%d\n", PACKAGE_NAME, PACKAGE_VERSION,
TAR_INCREMENTAL_VERSION);
s = (TYPE_SIGNED (time_t)
? imaxtostr (start_time.tv_sec, buf)
: umaxtostr (start_time.tv_sec, buf));
fwrite (s, strlen (s) + 1, 1, fp);
s = umaxtostr (start_time.tv_nsec, buf);
fwrite (s, strlen (s) + 1, 1, fp);
if (! ferror (fp) && directory_table)
hash_do_for_each (directory_table, write_directory_file_entry, fp);
if (ferror (fp))
write_error (listed_incremental_option);
if (fclose (fp) != 0)
close_error (listed_incremental_option);
}
/** \brief Decreases precision for high error values
*
* By default, this will decrement precision, halve the error value and
* add `full_error / 2` until the error is less than `max_error`
*/
static constexpr error_set truncate_error(int precision, int error)
{
static_assert(max_error > full_error, "max_error must be greater than full_error");
return error > max_error ? truncate_error(precision - 1, ceil((real_t)error/2)
+ full_error/2) : error_set(precision, error);
}
