Function get_sort

phx_percona/percona/sql/sql_acl.cc:1745–1789

*/

static ulong get_sort(uint count,...)
{
  va_list args;
  va_start(args,count);
  ulong sort=0;

  /* Should not use this function with more than 4 arguments for compare. */
  DBUG_ASSERT(count <= 4);

  while (count--)
  {
    char *start, *str= va_arg(args,char*);
    uint chars= 0;
    uint wild_pos= 0;

    /*
      wild_pos
        0                            if string is empty
        1                            if string is a single muilt-wildcard
                                     character('%')
        first wildcard position + 1  if string containg wildcards and
                                     non-wildcard characters
    */

    if ((start= str))
    {
      for (; *str ; str++)
      {
        if (*str == wild_prefix && str[1])
          str++;
        else if (*str == wild_many || *str == wild_one)
        {
          wild_pos= (uint) (str - start) + 1;
          if (!(wild_pos == 1 && *str == wild_many && *(++str) == '\0'))
            wild_pos++;
          break;
        }
        chars= 128;                             // Marker that chars existed
      }
    }
    sort= (sort << 8) + (wild_pos ? min(wild_pos, 127U) : chars);
  }
  va_end(args);
  return sort;
}


static int acl_compare(ACL_ACCESS *a,ACL_ACCESS *b)