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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/*
 * Copyright 2007-2021 The OpenSSL Project Authors. All Rights Reserved.
 * Copyright Nokia 2007-2019
 * Copyright Siemens AG 2015-2019
 *
 * Licensed under the Apache License 2.0 (the "License").  You may not use
 * this file except in compliance with the License.  You can obtain a copy
 * in the file LICENSE in the source distribution or at
 * https://www.openssl.org/source/license.html
 */

#ifndef OPENSSL_CMP_UTIL_H
#define OPENSSL_CMP_UTIL_H
#pragma once

#include <openssl/opensslconf.h>
#ifndef OPENSSL_NO_CMP

#include <openssl/macros.h>
#include <openssl/trace.h>

#ifdef __cplusplus
extern "C" {
#endif

int OSSL_CMP_log_open(void);
void OSSL_CMP_log_close(void);
#define OSSL_CMP_LOG_PREFIX "CMP "

/*
 * generalized logging/error callback mirroring the severity levels of syslog.h
 */
typedef int OSSL_CMP_severity;
#define OSSL_CMP_LOG_EMERG 0
#define OSSL_CMP_LOG_ALERT 1
#define OSSL_CMP_LOG_CRIT 2
#define OSSL_CMP_LOG_ERR 3
#define OSSL_CMP_LOG_WARNING 4
#define OSSL_CMP_LOG_NOTICE 5
#define OSSL_CMP_LOG_INFO 6
#define OSSL_CMP_LOG_DEBUG 7
#define OSSL_CMP_LOG_TRACE 8
#define OSSL_CMP_LOG_MAX OSSL_CMP_LOG_TRACE
typedef int (*OSSL_CMP_log_cb_t)(const char *func, const char *file, int line,
    OSSL_CMP_severity level, const char *msg);

int OSSL_CMP_print_to_bio(BIO *bio, const char *component, const char *file,
    int line, OSSL_CMP_severity level, const char *msg);
/* use of the logging callback for outputting error queue */
void OSSL_CMP_print_errors_cb(OSSL_CMP_log_cb_t log_fn);

#ifdef __cplusplus
}
#endif
#endif /* !defined(OPENSSL_NO_CMP) */
#endif /* !defined(OPENSSL_CMP_UTIL_H) */