晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 sh-3ll

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Current File : //usr/include/mysql/server/private/sql_plugin_compat.h
/* Copyright (C) 2013 Sergei Golubchik and Monty Program Ab

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; version 2 of the License.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335  USA */

/* old plugin api structures, used for backward compatibility */

#define upgrade_var(X) latest->X= X
#define upgrade_str(X) strmake_buf(latest->X, X)
#define downgrade_var(X) X= latest->X
#define downgrade_str(X) strmake_buf(X, latest->X)

/**************************************************************/
/* Authentication API, version 0x0100 *************************/
#define MIN_AUTHENTICATION_INTERFACE_VERSION 0x0100

struct MYSQL_SERVER_AUTH_INFO_0x0100 {
  const char *user_name;
  unsigned int user_name_length;
  const char *auth_string;
  unsigned long auth_string_length;
  char authenticated_as[49]; 
  char external_user[512];
  int  password_used;
  const char *host_or_ip;
  unsigned int host_or_ip_length;

  void upgrade(MYSQL_SERVER_AUTH_INFO *latest)
  {
    upgrade_var(user_name);
    upgrade_var(user_name_length);
    upgrade_var(auth_string);
    upgrade_var(auth_string_length);
    upgrade_str(authenticated_as);
    upgrade_str(external_user);
    upgrade_var(password_used);
    upgrade_var(host_or_ip);
    upgrade_var(host_or_ip_length);
  }
  void downgrade(MYSQL_SERVER_AUTH_INFO *latest)
  {
    downgrade_var(user_name);
    downgrade_var(user_name_length);
    downgrade_var(auth_string);
    downgrade_var(auth_string_length);
    downgrade_str(authenticated_as);
    downgrade_str(external_user);
    downgrade_var(password_used);
    downgrade_var(host_or_ip);
    downgrade_var(host_or_ip_length);
  }
};

/**************************************************************/