void
seek_diag_details (char const *name, off_t offset)
{
if (ignore_failed_read_option)
seek_warn_details (name, offset);
else
seek_error_details (name, offset);
}
/* Move archive descriptor by COUNT records worth. If COUNT is
positive we move forward, else we move negative. If it's a tape,
MTIOCTOP had better work. If it's something else, we try to seek
on it. If we can't seek, we lose! */
static void
move_archive (off_t count)
{
if (count == 0)
return;
#ifdef MTIOCTOP
{
struct mtop operation;
if (count < 0
? (operation.mt_op = MTBSR,
operation.mt_count = -count,
operation.mt_count == -count)
: (operation.mt_op = MTFSR,
operation.mt_count = count,
operation.mt_count == count))
{
if (0 <= rmtioctl (archive, MTIOCTOP, (char *) &operation))
return;
if (errno == EIO
&& 0 <= rmtioctl (archive, MTIOCTOP, (char *) &operation))
return;
}
}
#endif /* MTIOCTOP */
{
off_t position0 = rmtlseek (archive, (off_t) 0, SEEK_CUR);
off_t increment = record_size * (off_t) count;
off_t position = position0 + increment;
if (increment / count != record_size
|| (position < position0) != (increment < 0)
|| (position = position < 0 ? 0 : position,
rmtlseek (archive, position, SEEK_SET) != position))
seek_error_details (archive_name_array[0], position);
return;
}
}