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 2019-2025 The OpenSSL Project Authors. All Rights Reserved.
 *
 * 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_PROVIDER_H
#define OPENSSL_PROVIDER_H
#pragma once

#include <openssl/core.h>

#ifdef __cplusplus
extern "C" {
#endif

/* Set and Get a library context search path */
int OSSL_PROVIDER_set_default_search_path(OSSL_LIB_CTX *, const char *path);
const char *OSSL_PROVIDER_get0_default_search_path(OSSL_LIB_CTX *libctx);

/* Load and unload a provider */
OSSL_PROVIDER *OSSL_PROVIDER_load(OSSL_LIB_CTX *, const char *name);
OSSL_PROVIDER *OSSL_PROVIDER_load_ex(OSSL_LIB_CTX *, const char *name,
    OSSL_PARAM *params);
OSSL_PROVIDER *OSSL_PROVIDER_try_load(OSSL_LIB_CTX *, const char *name,
    int retain_fallbacks);
OSSL_PROVIDER *OSSL_PROVIDER_try_load_ex(OSSL_LIB_CTX *, const char *name,
    OSSL_PARAM *params,
    int retain_fallbacks);
int OSSL_PROVIDER_unload(OSSL_PROVIDER *prov);
int OSSL_PROVIDER_available(OSSL_LIB_CTX *, const char *name);
int OSSL_PROVIDER_do_all(OSSL_LIB_CTX *ctx,
    int (*cb)(OSSL_PROVIDER *provider, void *cbdata),
    void *cbdata);

const OSSL_PARAM *OSSL_PROVIDER_gettable_params(const OSSL_PROVIDER *prov);
int OSSL_PROVIDER_get_params(const OSSL_PROVIDER *prov, OSSL_PARAM params[]);
int OSSL_PROVIDER_self_test(const OSSL_PROVIDER *prov);
int OSSL_PROVIDER_get_capabilities(const OSSL_PROVIDER *prov,
    const char *capability,
    OSSL_CALLBACK *cb,
    void *arg);

/*-
 * Provider configuration parameters are normally set in the configuration file,
 * but can also be set early in the main program before a provider is in use by
 * multiple threads.
 *
 * Only UTF8-string values are supported.
 */
int OSSL_PROVIDER_add_conf_parameter(OSSL_PROVIDER *prov, const char *name,
    const char *value);
/*
 * Retrieves any of the requested configuration parameters for the given
 * provider that were set in the configuration file or via the above
 * OSSL_PROVIDER_add_parameter() function.
 *
 * The |params| array elements MUST have type OSSL_PARAM_UTF8_PTR, values are
 * returned by reference, not as copies.
 */
int OSSL_PROVIDER_get_conf_parameters(const OSSL_PROVIDER *prov,
    OSSL_PARAM params[]);
/*
 * Parse a provider configuration parameter as a boolean value,
 * or return a default value if unable to retrieve the parameter.
 * Values like "1", "yes", "true", ... are true (nonzero).
 * Values like "0", "no", "false", ... are false (zero).
 */
int OSSL_PROVIDER_conf_get_bool(const OSSL_PROVIDER *prov,
    const char *name, int defval);

const OSSL_ALGORITHM *OSSL_PROVIDER_query_operation(const OSSL_PROVIDER *prov,
    int operation_id,
    int *no_cache);
void OSSL_PROVIDER_unquery_operation(const OSSL_PROVIDER *prov,
    int operation_id, const OSSL_ALGORITHM *algs);
void *OSSL_PROVIDER_get0_provider_ctx(const OSSL_PROVIDER *prov);
const OSSL_DISPATCH *OSSL_PROVIDER_get0_dispatch(const OSSL_PROVIDER *prov);

/* Add a built in providers */
int OSSL_PROVIDER_add_builtin(OSSL_LIB_CTX *, const char *name,
    OSSL_provider_init_fn *init_fn);

/* Information */
const char *OSSL_PROVIDER_get0_name(const OSSL_PROVIDER *prov);

#ifdef __cplusplus
}
#endif

#endif