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/bits/posix2_lim.h
/* Copyright (C) 1991-2018 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library 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
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

/*
 * Never include this file directly; include <limits.h> instead.
 */

#ifndef	_BITS_POSIX2_LIM_H
#define	_BITS_POSIX2_LIM_H	1


/* The maximum `ibase' and `obase' values allowed by the `bc' utility.  */
#define	_POSIX2_BC_BASE_MAX		99

/* The maximum number of elements allowed in an array by the `bc' utility.  */
#define	_POSIX2_BC_DIM_MAX		2048

/* The maximum `scale' value allowed by the `bc' utility.  */
#define	_POSIX2_BC_SCALE_MAX		99

/* The maximum length of a string constant accepted by the `bc' utility.  */
#define	_POSIX2_BC_STRING_MAX		1000

/* The maximum number of weights that can be assigned to an entry of
   the LC_COLLATE `order' keyword in the locale definition file.  */
#define	_POSIX2_COLL_WEIGHTS_MAX	2

/* The maximum number of expressions that can be nested
   within parentheses by the `expr' utility.  */
#define	_POSIX2_EXPR_NEST_MAX		32

/* The maximum length, in bytes, of an input line.  */
#define	_POSIX2_LINE_MAX		2048

/* The maximum number of repeated occurrences of a regular expression
   permitted when using the interval notation `\{M,N\}'.  */
#define	_POSIX2_RE_DUP_MAX		255

/* The maximum number of bytes in a character class name.  We have no
   fixed limit, 2048 is a high number.  */
#define	_POSIX2_CHARCLASS_NAME_MAX	14


/* These values are implementation-specific,
   and may vary within the implementation.
   Their precise values can be obtained from sysconf.  */

#ifndef	BC_BASE_MAX
#define	BC_BASE_MAX		_POSIX2_BC_BASE_MAX
#endif
#ifndef	BC_DIM_MAX
#define	BC_DIM_MAX		_POSIX2_BC_DIM_MAX
#endif
#ifndef	BC_SCALE_MAX
#define	BC_SCALE_MAX		_POSIX2_BC_SCALE_MAX
#endif
#ifndef	BC_STRING_MAX
#define	BC_STRING_MAX		_POSIX2_BC_STRING_MAX
#endif
#ifndef	COLL_WEIGHTS_MAX
#define	COLL_WEIGHTS_MAX	255
#endif
#ifndef	EXPR_NEST_MAX
#define	EXPR_NEST_MAX		_POSIX2_EXPR_NEST_MAX
#endif
#ifndef	LINE_MAX
#define	LINE_MAX		_POSIX2_LINE_MAX
#endif
#ifndef	CHARCLASS_NAME_MAX
#define	CHARCLASS_NAME_MAX	2048
#endif

/* This value is defined like this in regex.h.  */
#define	RE_DUP_MAX (0x7fff)

#endif	/* bits/posix2_lim.h */

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