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　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。 . Prv8 Shell

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/*
 * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, you can obtain one at https://mozilla.org/MPL/2.0/.
 *
 * See the COPYRIGHT file distributed with this work for additional
 * information regarding copyright ownership.
 */


#ifndef ISC_COMMANDLINE_H
#define ISC_COMMANDLINE_H 1

/*! \file isc/commandline.h */

#include <stdbool.h>

#include <isc/lang.h>
#include <isc/platform.h>
#include <isc/result.h>

/*% Index into parent argv vector. */
LIBISC_EXTERNAL_DATA extern int isc_commandline_index;
/*% Character checked for validity. */
LIBISC_EXTERNAL_DATA extern int isc_commandline_option;
/*% Argument associated with option. */
LIBISC_EXTERNAL_DATA extern char *isc_commandline_argument;
/*% For printing error messages. */
LIBISC_EXTERNAL_DATA extern char *isc_commandline_progname;
/*% Print error message. */
LIBISC_EXTERNAL_DATA extern bool isc_commandline_errprint;
/*% Reset getopt. */
LIBISC_EXTERNAL_DATA extern bool isc_commandline_reset;

ISC_LANG_BEGINDECLS

int
isc_commandline_parse(int argc, char * const *argv, const char *options);
/*%<
 * Parse a command line (similar to getopt())
 */

isc_result_t
isc_commandline_strtoargv(isc_mem_t *mctx, char *s, unsigned int *argcp,
			  char ***argvp, unsigned int n);
/*%<
 * Tokenize the string "s" into whitespace-separated words,
 * returning the number of words in '*argcp' and an array
 * of pointers to the words in '*argvp'.  The caller
 * must free the array using isc_mem_free().  The string
 * is modified in-place.
 */

ISC_LANG_ENDDECLS

#endif /* ISC_COMMANDLINE_H */

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