json.c File Reference

JSON parser.

Copyright (c) 2016-2018 Microchip Technology Inc. and its subsidiaries.

#include "iot/json.h"
#include <string.h>
#include <stdio.h>
#include <errno.h>

Enumerations
enum	json_cmd {   JSON_CMD_NONE = 0,   JSON_CMD_ENTER_OBJECT,   JSON_CMD_EXIT_OBJECT,   JSON_CMD_ENTER_ARRAY,   JSON_CMD_EXIT_ARRAY }

Functions
static void	_json_parse (char *data, char *ptr, enum json_cmd cmd, struct json_obj *out)
static char *	_json_read_token (char *buffer, uint32_t buffer_size, char *dest, uint32_t dest_size, enum json_cmd *cmd)
	is pair of name : value. More...
int	json_create (struct json_obj *obj, const char *data, int data_len)
	Create the JSON data from the string buffer. More...
int	json_find (struct json_obj *obj, const char *name, struct json_obj *out)
	Find data from the JSON object. More...
int	json_get_child (struct json_obj *obj, int index, struct json_obj *out)
	Get child data in the JSON object. More...
int	json_get_child_count (struct json_obj *obj)
	Get child count in the JSON object. More...

enum json_cmd

Enumerator
JSON_CMD_NONE
JSON_CMD_ENTER_OBJECT
JSON_CMD_EXIT_OBJECT
JSON_CMD_ENTER_ARRAY
JSON_CMD_EXIT_ARRAY

static void _json_parse ( char *  data, char *  ptr, enum json_cmd  cmd, struct json_obj *  out  )

static

References json_obj::b, json_obj::d, json_obj::i, JSON_CMD_ENTER_ARRAY, JSON_CMD_ENTER_OBJECT, JSON_MAX_NAME_SIZE, JSON_MAX_TOKEN_SIZE, JSON_TYPE_ARRAY, JSON_TYPE_BOOLEAN, JSON_TYPE_INTEGER, JSON_TYPE_NULL, JSON_TYPE_OBJECT, JSON_TYPE_REAL, JSON_TYPE_STRING, json_obj::name, json_obj::o, json_obj::s, json_obj::type, and json_obj::value.

Referenced by json_find(), and json_get_child().

static char* _json_read_token ( char *  buffer, uint32_t  buffer_size, char *  dest, uint32_t  dest_size, enum json_cmd *  cmd  )

static

is pair of name : value.

Parameters

buffer	: [in] Read out line
dest	: [out] destination buffer
cmd	: [out] 0 : none 1: enter object 2: exit object 3: enter array 4: exit array

Returns

: start point of next token

References JSON_CMD_ENTER_ARRAY, JSON_CMD_ENTER_OBJECT, JSON_CMD_EXIT_ARRAY, JSON_CMD_EXIT_OBJECT, JSON_CMD_NONE, and NULL.

Referenced by json_find(), json_get_child(), and json_get_child_count().

int json_create	(	struct json_obj *	obj,
		const char *	data,
		int	data_len
	)

Create the JSON data from the string buffer.

Parameters

[out]	obj	Pointer of JSON token which will be stored json informations.
[in]	data	JSON data represented as a string.
[in]	data_len	JSON data length.

Returns

0 Success.

otherwise Failed to create.

References json_obj::end_ptr, JSON_TYPE_OBJECT, json_obj::name, NULL, json_obj::o, json_obj::type, and json_obj::value.

int json_find	(	struct json_obj *	obj,
		const char *	name,
		struct json_obj *	out
	)

Find data from the JSON object.

The input should be an object or array. This function supported colon separated search.

If JSON data is as follows {"obj1":{"data1":"value1","data2":"value2","obj2":{"data3":"value3"}}} You can be found value of data3 using the following name variable. "obj1:obj2:data3"

Parameters

[in]	obj	Pointer of the parent JSON data.
[in]	name	The name of the item you are looking for.
[in]	out	Pointer of JSON token which will be stored child JSON informations.

Returns

0 Success.

otherwise Failed to create.

References _json_parse(), _json_read_token(), json_obj::end_ptr, JSON_CMD_ENTER_ARRAY, JSON_CMD_ENTER_OBJECT, JSON_CMD_EXIT_ARRAY, JSON_CMD_EXIT_OBJECT, JSON_CMD_NONE, JSON_MAX_TOKEN_SIZE, JSON_TYPE_ARRAY, JSON_TYPE_OBJECT, json_obj::name, NULL, json_obj::o, json_obj::type, and json_obj::value.

int json_get_child	(	struct json_obj *	obj,
		int	index,
		struct json_obj *	out
	)

Get child data in the JSON object.

The input should be an object or array.

Parameters

[in]	obj	Pointer of the parent JSON data.
[in]	index	Index which is located in the parent object.
[in]	out	Pointer of JSON token which will be stored child JSON informations.

Returns

0 Success.

otherwise Failed to create.

References _json_parse(), _json_read_token(), json_obj::end_ptr, JSON_CMD_ENTER_ARRAY, JSON_CMD_ENTER_OBJECT, JSON_CMD_EXIT_ARRAY, JSON_CMD_EXIT_OBJECT, JSON_CMD_NONE, JSON_MAX_TOKEN_SIZE, JSON_TYPE_ARRAY, JSON_TYPE_OBJECT, NULL, json_obj::o, json_obj::type, and json_obj::value.

int json_get_child_count

(

struct json_obj *

obj

)

Get child count in the JSON object.

The input should be an object or array.

Parameters

[in]

obj

Pointer of the parent JSON data.

Returns

0 Success.

otherwise Failed to create.

References _json_read_token(), json_obj::end_ptr, JSON_CMD_ENTER_ARRAY, JSON_CMD_ENTER_OBJECT, JSON_CMD_EXIT_ARRAY, JSON_CMD_EXIT_OBJECT, JSON_CMD_NONE, JSON_TYPE_ARRAY, JSON_TYPE_OBJECT, NULL, json_obj::o, json_obj::type, and json_obj::value.