Method init

sql/sql_acl.cc:623–667

}

bool ROLE_GRANT_PAIR::init(MEM_ROOT *mem,
                           const LEX_CSTRING &username,
                           const LEX_CSTRING &hostname,
                           const LEX_CSTRING &rolename,
                           bool with_admin_option)
{
  /*
    Create a buffer that holds all 3 NULL terminated strings in succession
    To save memory space, the same buffer is used as the hashkey
    Add the '\0' as well.
  */
  size_t bufflen= username.length + hostname.length + rolename.length + 3;
  char *buff= (char *)alloc_root(mem, bufflen);
  if (!buff)
    return true;

  /*
    Offsets in the buffer for all 3 strings
  */
  char *username_pos= buff;
  char *hostname_pos= buff + username.length + 1;
  char *rolename_pos= buff + username.length + hostname.length + 2;

  if (username.str) //prevent undefined behaviour
    memcpy(username_pos, username.str, username.length);
  username_pos[username.length]= '\0';         //#1 string terminator
  u_uname= Lex_cstring(username_pos, username.length);

  if (hostname.str) //prevent undefined behaviour
    memcpy(hostname_pos, hostname.str, hostname.length);
  hostname_pos[hostname.length]= '\0';         //#2 string terminator
  u_hname= Lex_cstring(hostname_pos, hostname.length);

  if (rolename.str) //prevent undefined behaviour
    memcpy(rolename_pos, rolename.str, rolename.length);
  rolename_pos[rolename.length]= '\0';         //#3 string terminator
  r_uname= Lex_cstring(rolename_pos, rolename.length);

  hashkey.str = buff;
  hashkey.length = bufflen;

  with_admin= with_admin_option;

  return false;
}

#define IP_ADDR_STRLEN (3 + 1 + 3 + 1 + 3 + 1 + 3)