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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/*
 * $Id: json_util.h,v 1.4 2006/01/30 23:07:57 mclark Exp $
 *
 * Copyright (c) 2004, 2005 Metaparadigm Pte. Ltd.
 * Michael Clark <michael@metaparadigm.com>
 *
 * This library is free software; you can redistribute it and/or modify
 * it under the terms of the MIT license. See COPYING for details.
 *
 */

/**
 * @file
 * @brief Miscllaneous utility functions and macros.
 */ 
#ifndef _json_util_h_
#define _json_util_h_

#include "json_object.h"

#ifndef json_min
#define json_min(a,b) ((a) < (b) ? (a) : (b))
#endif

#ifndef json_max
#define json_max(a,b) ((a) > (b) ? (a) : (b))
#endif


#ifdef __cplusplus
extern "C" {
#endif

#define JSON_FILE_BUF_SIZE 4096

/* utility functions */
/**
 * Read the full contents of the given file, then convert it to a
 * json_object using json_tokener_parse().
 *
 * Returns -1 if something fails.  See json_util_get_last_err() for details.
 */
extern struct json_object* json_object_from_file(const char *filename);

/**
 * Create a JSON object from already opened file descriptor.
 *
 * This function can be helpful, when you opened the file already,
 * e.g. when you have a temp file.
 * Note, that the fd must be readable at the actual position, i.e.
 * use lseek(fd, 0, SEEK_SET) before.
 *
 * Returns -1 if something fails.  See json_util_get_last_err() for details.
 */
extern struct json_object* json_object_from_fd(int fd);

/**
 * Equivalent to:
 *   json_object_to_file_ext(filename, obj, JSON_C_TO_STRING_PLAIN);
 *
 * Returns -1 if something fails.  See json_util_get_last_err() for details.
 */
extern int json_object_to_file(const char *filename, struct json_object *obj);

/**
 * Open and truncate the given file, creating it if necessary, then
 * convert the json_object to a string and write it to the file.
 *
 * Returns -1 if something fails.  See json_util_get_last_err() for details.
 */
extern int json_object_to_file_ext(const char *filename, struct json_object *obj, int flags);

/**
 * Convert the json_object to a string and write it to the file descriptor.
 * Handles partial writes and will keep writing until done, or an error
 * occurs.
 *
 * @param fd an open, writable file descriptor to write to
 * @param obj the object to serializer and write
 * @param flags flags to pass to json_object_to_json_string_ext()
 * @return -1 if something fails.  See json_util_get_last_err() for details.
 */
extern int json_object_to_fd(int fd, struct json_object *obj, int flags);

/**
 * Return the last error from various json-c functions, including:
 * json_object_to_file{,_ext}, json_object_to_fd() or
 * json_object_from_{file,fd}, or NULL if there is none.
 */
const char *json_util_get_last_err(void);


extern int json_parse_int64(const char *buf, int64_t *retval);
extern int json_parse_double(const char *buf, double *retval);

/**
 * Return a string describing the type of the object.
 * e.g. "int", or "object", etc...
 */
extern const char *json_type_to_name(enum json_type o_type);

#ifdef __cplusplus
}
#endif

#endif

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