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
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
|
/* Parse JSON files using the JSMN parser. */
/*
* Copyright (c) 2014, Intel Corporation
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include "jsmn.h"
#include "json.h"
#include <linux/kernel.h>
static char *mapfile(const char *fn, size_t *size)
{
unsigned ps = sysconf(_SC_PAGESIZE);
struct stat st;
char *map = NULL;
int err;
int fd = open(fn, O_RDONLY);
if (fd < 0 && verbose > 0 && fn) {
pr_err("Error opening events file '%s': %s\n", fn,
strerror(errno));
}
if (fd < 0)
return NULL;
err = fstat(fd, &st);
if (err < 0)
goto out;
*size = st.st_size;
map = mmap(NULL,
(st.st_size + ps - 1) & ~(ps - 1),
PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
if (map == MAP_FAILED)
map = NULL;
out:
close(fd);
return map;
}
static void unmapfile(char *map, size_t size)
{
unsigned ps = sysconf(_SC_PAGESIZE);
munmap(map, roundup(size, ps));
}
/*
* Parse json file using jsmn. Return array of tokens,
* and mapped file. Caller needs to free array.
*/
jsmntok_t *parse_json(const char *fn, char **map, size_t *size, int *len)
{
jsmn_parser parser;
jsmntok_t *tokens;
jsmnerr_t res;
unsigned sz;
*map = mapfile(fn, size);
if (!*map)
return NULL;
/* Heuristic */
sz = *size * 16;
tokens = malloc(sz);
if (!tokens)
goto error;
jsmn_init(&parser);
res = jsmn_parse(&parser, *map, *size, tokens,
sz / sizeof(jsmntok_t));
if (res != JSMN_SUCCESS) {
pr_err("%s: json error %s\n", fn, jsmn_strerror(res));
goto error_free;
}
if (len)
*len = parser.toknext;
return tokens;
error_free:
free(tokens);
error:
unmapfile(*map, *size);
return NULL;
}
void free_json(char *map, size_t size, jsmntok_t *tokens)
{
free(tokens);
unmapfile(map, size);
}
static int countchar(char *map, char c, int end)
{
int i;
int count = 0;
for (i = 0; i < end; i++)
if (map[i] == c)
count++;
return count;
}
/* Return line number of a jsmn token */
int json_line(char *map, jsmntok_t *t)
{
return countchar(map, '\n', t->start) + 1;
}
static const char * const jsmn_types[] = {
[JSMN_PRIMITIVE] = "primitive",
[JSMN_ARRAY] = "array",
[JSMN_OBJECT] = "object",
[JSMN_STRING] = "string"
};
#define LOOKUP(a, i) ((i) < (sizeof(a)/sizeof(*(a))) ? ((a)[i]) : "?")
/* Return type name of a jsmn token */
const char *json_name(jsmntok_t *t)
{
return LOOKUP(jsmn_types, t->type);
}
int json_len(jsmntok_t *t)
{
return t->end - t->start;
}
/* Is string t equal to s? */
int json_streq(char *map, jsmntok_t *t, const char *s)
{
unsigned len = json_len(t);
return len == strlen(s) && !strncasecmp(map + t->start, s, len);
}
|
