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。 .
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Current File : //usr/include/ndbm.h
/* ndbm.h  -  The include file for ndbm users.  */

/*  This file is part of GDBM, the GNU data base manager, by Philip A. Nelson.
    Copyright (C) 1990-2011, 2017-2018 Free Software Foundation, Inc.

    GDBM 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; either version 2, or (at your option)
    any later version.

    GDBM 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 GDBM. If not, see <http://www.gnu.org/licenses/>.

    You may contact the author by:
       e-mail:  phil@cs.wwu.edu
      us-mail:  Philip A. Nelson
                Computer Science Department
                Western Washington University
                Bellingham, WA 98226
       
*************************************************************************/

#include <gdbm.h>

/* Parameters to dbm_store for simple insertion or replacement. */
#define DBM_INSERT  GDBM_INSERT
#define DBM_REPLACE GDBM_REPLACE

/* The file information header.  */
typedef struct
{
  GDBM_FILE file;         /* Actual gdbm file (held in the .pag file */
  int dirfd;              /* Descriptor of the .dir file */
  datum _dbm_memory;      /* Keeps the last returned key */
  char *_dbm_fetch_val;   /* Keeps the dptr of the last fetched datum */
  gdbm_error _dbm_errno;  /* Error code from the last failed call */
} DBM;

/* Used internally by the library */
#define __gdbm_error_to_ndbm(dbm)				\
  do								\
    {								\
      if (gdbm_errno && gdbm_errno != GDBM_ITEM_NOT_FOUND)	\
	(dbm)->_dbm_errno = gdbm_errno;				\
    }								\
  while (0)

/* These are the routines */

extern DBM 	*dbm_open (char *file, int flags, int mode);
extern void	 dbm_close (DBM *dbf);
extern datum	 dbm_fetch (DBM *dbf, datum key);
extern int	 dbm_store (DBM *dbf, datum key, datum content, int flags);
extern int	 dbm_delete (DBM *dbf, datum key);
extern datum	 dbm_firstkey (DBM *dbf);
extern datum	 dbm_nextkey (DBM *dbf);
extern int       dbm_error (DBM *dbf);
extern void      dbm_clearerr (DBM *dbf);
extern int	 dbm_dirfno (DBM *dbf);
extern int	 dbm_pagfno (DBM *dbf);
extern int	 dbm_rdonly (DBM *dbf);

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