Function fill_schema_schema_privileges

phx_percona/percona/sql/sql_acl.cc:9208–9283

int fill_schema_schema_privileges(THD *thd, TABLE_LIST *tables, Item *cond)
{
#ifndef NO_EMBEDDED_ACCESS_CHECKS
  int error= 0;
  uint counter;
  ACL_DB *acl_db;
  ulong want_access;
  char buff[100];
  TABLE *table= tables->table;
  bool no_global_access= check_access(thd, SELECT_ACL, "mysql",
                                      NULL, NULL, 1, 1);
  char *curr_host= thd->security_ctx->priv_host_name();
  DBUG_ENTER("fill_schema_schema_privileges");

  if (!initialized)
    DBUG_RETURN(0);
  mysql_mutex_lock(&acl_cache->lock);

  for (counter=0 ; counter < acl_dbs.elements ; counter++)
  {
    const char *user, *host, *is_grantable="YES";

    acl_db=dynamic_element(&acl_dbs,counter,ACL_DB*);
    if (!(user=acl_db->user))
      user= "";
    if (!(host=acl_db->host.get_host()))
      host= "";

    if (no_global_access &&
        (strcmp(thd->security_ctx->priv_user, user) ||
         my_strcasecmp(system_charset_info, curr_host, host)))
      continue;

    want_access=acl_db->access;
    if (want_access)
    {
      if (!(want_access & GRANT_ACL))
      {
        is_grantable= "NO";
      }
      strxmov(buff,"'",user,"'@'",host,"'",NullS);
      if (!(want_access & ~GRANT_ACL))
      {
        if (update_schema_privilege(thd, table, buff, acl_db->db, 0, 0,
                                    0, STRING_WITH_LEN("USAGE"), is_grantable))
        {
          error= 1;
          goto err;
        }
      }
      else
      {
        int cnt;
        ulong j,test_access= want_access & ~GRANT_ACL;
        for (cnt=0, j = SELECT_ACL; j <= DB_ACLS; cnt++,j <<= 1)
          if (test_access & j)
          {
            if (update_schema_privilege(thd, table, buff, acl_db->db, 0, 0, 0,