1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
|
/*
This file is part of GNUnet
Copyright (C) 2014, 2015, 2016 GNUnet e.V.
GNUnet is free software; you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation; either version 3, or (at your option) any later version.
GNUnet is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
GNUnet; see the file COPYING. If not, If not, see <http://www.gnu.org/licenses/>
*/
/**
* @file json/json.c
* @brief functions to parse JSON snippets
* @author Florian Dold
* @author Benedikt Mueller
* @author Christian Grothoff
*/
#include "platform.h"
#include "gnunet_json_lib.h"
/**
* Navigate and parse data in a JSON tree. Tries to parse the @a root
* to find all of the values given in the @a spec. If one of the
* entries in @a spec cannot be found or parsed, the name of the JSON
* field is returned in @a error_json_name, and the offset of the
* entry in @a spec is returned in @a error_line.
*
* @param root the JSON node to start the navigation at.
* @param spec parse specification array
* @param[out] error_json_name which JSON field was problematic
* @param[out] which index into @a spec did we encounter an error
* @return #GNUNET_OK on success, #GNUNET_SYSERR on error
*/
int
GNUNET_JSON_parse (const json_t *root,
struct GNUNET_JSON_Specification *spec,
const char **error_json_name,
unsigned int *error_line)
{
unsigned int i;
json_t *pos;
if (NULL == root)
return GNUNET_SYSERR;
for (i=0;NULL != spec[i].parser;i++)
{
if (NULL == spec[i].field)
pos = (json_t *) root;
else
pos = json_object_get (root,
spec[i].field);
if ( (NULL == pos) ||
(GNUNET_OK !=
spec[i].parser (spec[i].cls,
pos,
&spec[i])) )
{
if (NULL != error_json_name)
*error_json_name = spec[i].field;
if (NULL != error_line)
*error_line = i;
GNUNET_JSON_parse_free (spec);
return GNUNET_SYSERR;
}
}
return GNUNET_OK; /* all OK! */
}
/**
* Frees all elements allocated during a #GNUNET_JSON_parse()
* operation.
*
* @param spec specification of the parse operation
*/
void
GNUNET_JSON_parse_free (struct GNUNET_JSON_Specification *spec)
{
unsigned int i;
for (i=0;NULL != spec[i].parser;i++)
if (NULL != spec[i].cleaner)
spec[i].cleaner (spec[i].cls,
&spec[i]);
}
/* end of json.c */
|
