Function parse_table_name

storage/sequence/sequence.cc:286–302

static bool parse_table_name(const char *name, size_t name_length,
                             ulonglong *from, ulonglong *to, ulonglong *step)
{
  uint n0=0, n1= 0, n2= 0;
  *step= 1;

  // the table is discovered if its name matches the pattern of seq_1_to_10 or 
  // seq_1_to_10_step_3
  sscanf(name, "seq_%llu_to_%n%llu%n_step_%llu%n",
         from, &n0, to, &n1, step, &n2);
  // I consider this a bug in sscanf() - when an unsigned number
  // is requested, -5 should *not* be accepted. But is is :(
  // hence the additional check below:
  return
    n0 == 0 || !isdigit(name[4]) || !isdigit(name[n0]) || // reject negative numbers
    (n1 != name_length && n2 != name_length);
}


Sequence_share *ha_seq::get_share()