summaryrefslogtreecommitdiffstats
path: root/tools/perf/pmu-events/jsmn.c
blob: 11d1fa18bfa5314f18a1081d4f14efd079f681f9 (plain)
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
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
/*
 * Copyright (c) 2010 Serge A. Zaitsev
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * Slightly modified by AK to not assume 0 terminated input.
 */

#include <stdlib.h>
#include "jsmn.h"

/*
 * Allocates a fresh unused token from the token pool.
 */
static jsmntok_t *jsmn_alloc_token(jsmn_parser *parser,
				   jsmntok_t *tokens, size_t num_tokens)
{
	jsmntok_t *tok;

	if ((unsigned)parser->toknext >= num_tokens)
		return NULL;
	tok = &tokens[parser->toknext++];
	tok->start = tok->end = -1;
	tok->size = 0;
	return tok;
}

/*
 * Fills token type and boundaries.
 */
static void jsmn_fill_token(jsmntok_t *token, jsmntype_t type,
			    int start, int end)
{
	token->type = type;
	token->start = start;
	token->end = end;
	token->size = 0;
}

/*
 * Fills next available token with JSON primitive.
 */
static jsmnerr_t jsmn_parse_primitive(jsmn_parser *parser, const char *js,
				      size_t len,
				      jsmntok_t *tokens, size_t num_tokens)
{
	jsmntok_t *token;
	int start;

	start = parser->pos;

	for (; parser->pos < len; parser->pos++) {
		switch (js[parser->pos]) {
#ifndef JSMN_STRICT
		/*
		 * In strict mode primitive must be followed by ","
		 * or "}" or "]"
		 */
		case ':':
#endif
		case '\t':
		case '\r':
		case '\n':
		case ' ':
		case ',':
		case ']':
		case '}':
			goto found;
		default:
			break;
		}
		if (js[parser->pos] < 32 || js[parser->pos] >= 127) {
			parser->pos = start;
			return JSMN_ERROR_INVAL;
		}
	}
#ifdef JSMN_STRICT
	/*
	 * In strict mode primitive must be followed by a
	 * comma/object/array.
	 */
	parser->pos = start;
	return JSMN_ERROR_PART;
#endif

found:
	token = jsmn_alloc_token(parser, tokens, num_tokens);
	if (token == NULL) {
		parser->pos = start;
		return JSMN_ERROR_NOMEM;
	}
	jsmn_fill_token(token, JSMN_PRIMITIVE, start, parser->pos);
	parser->pos--; /* parent sees closing brackets */
	return JSMN_SUCCESS;
}

/*
 * Fills next token with JSON string.
 */
static jsmnerr_t jsmn_parse_string(jsmn_parser *parser, const char *js,
				   size_t len,
				   jsmntok_t *tokens, size_t num_tokens)
{
	jsmntok_t *token;
	int start = parser->pos;

	/* Skip starting quote */
	parser->pos++;

	for (; parser->pos < len; parser->pos++) {
		char c = js[parser->pos];

		/* Quote: end of string */
		if (c == '\"') {
			token = jsmn_alloc_token(parser, tokens, num_tokens);
			if (token == NULL) {
				parser->pos = start;
				return JSMN_ERROR_NOMEM;
			}
			jsmn_fill_token(token, JSMN_STRING, start+1,
					parser->pos);
			return JSMN_SUCCESS;
		}

		/* Backslash: Quoted symbol expected */
		if (c == '\\') {
			parser->pos++;
			switch (js[parser->pos]) {
				/* Allowed escaped symbols */
			case '\"':
			case '/':
			case '\\':
			case 'b':
			case 'f':
			case 'r':
			case 'n':
			case 't':
				break;
				/* Allows escaped symbol \uXXXX */
			case 'u':
				/* TODO */
				break;
				/* Unexpected symbol */
			default:
				parser->pos = start;
				return JSMN_ERROR_INVAL;
			}
		}
	}
	parser->pos = start;
	return JSMN_ERROR_PART;
}

/*
 * Parse JSON string and fill tokens.
 */
jsmnerr_t jsmn_parse(jsmn_parser *parser, const char *js, size_t len,
		     jsmntok_t *tokens, unsigned int num_tokens)
{
	jsmnerr_t r;
	int i;
	jsmntok_t *token;

	for (; parser->pos < len; parser->pos++) {
		char c;
		jsmntype_t type;

		c = js[parser->pos];
		switch (c) {
		case '{':
		case '[':
			token = jsmn_alloc_token(parser, tokens, num_tokens);
			if (token == NULL)
				return JSMN_ERROR_NOMEM;
			if (parser->toksuper != -1)
				tokens[parser->toksuper].size++;
			token->type = (c == '{' ? JSMN_OBJECT : JSMN_ARRAY);
			token->start = parser->pos;
			parser->toksuper = parser->toknext - 1;
			break;
		case '}':
		case ']':
			type = (c == '}' ? JSMN_OBJECT : JSMN_ARRAY);
			for (i = parser->toknext - 1; i >= 0; i--) {
				token = &tokens[i];
				if (token->start != -1 && token->end == -1) {
					if (token->type != type)
						return JSMN_ERROR_INVAL;
					parser->toksuper = -1;
					token->end = parser->pos + 1;
					break;
				}
			}
			/* Error if unmatched closing bracket */
			if (i == -1)
				return JSMN_ERROR_INVAL;
			for (; i >= 0; i--) {
				token = &tokens[i];
				if (token->start != -1 && token->end == -1) {
					parser->toksuper = i;
					break;
				}
			}
			break;
		case '\"':
			r = jsmn_parse_string(parser, js, len, tokens,
					      num_tokens);
			if (r < 0)
				return r;
			if (parser->toksuper != -1)
				tokens[parser->toksuper].size++;
			break;
		case '\t':
		case '\r':
		case '\n':
		case ':':
		case ',':
		case ' ':
			break;
#ifdef JSMN_STRICT
			/*
			 * In strict mode primitives are:
			 * numbers and booleans.
			 */
		case '-':
		case '0':
		case '1':
		case '2':
		case '3':
		case '4':
		case '5':
		case '6':
		case '7':
		case '8':
		case '9':
		case 't':
		case 'f':
		case 'n':
#else
			/*
			 * In non-strict mode every unquoted value
			 * is a primitive.
			 */
			/*FALL THROUGH */
		default:
#endif
			r = jsmn_parse_primitive(parser, js, len, tokens,
						 num_tokens);
			if (r < 0)
				return r;
			if (parser->toksuper != -1)
				tokens[parser->toksuper].size++;
			break;

#ifdef JSMN_STRICT
			/* Unexpected char in strict mode */
		default:
			return JSMN_ERROR_INVAL;
#endif
		}
	}

	for (i = parser->toknext - 1; i >= 0; i--) {
		/* Unmatched opened object or array */
		if (tokens[i].start != -1 && tokens[i].end == -1)
			return JSMN_ERROR_PART;
	}

	return JSMN_SUCCESS;
}

/*
 * Creates a new parser based over a given  buffer with an array of tokens
 * available.
 */
void jsmn_init(jsmn_parser *parser)
{
	parser->pos = 0;
	parser->toknext = 0;
	parser->toksuper = -1;
}

const char *jsmn_strerror(jsmnerr_t err)
{
	switch (err) {
	case JSMN_ERROR_NOMEM:
		return "No enough tokens";
	case JSMN_ERROR_INVAL:
		return "Invalid character inside JSON string";
	case JSMN_ERROR_PART:
		return "The string is not a full JSON packet, more bytes expected";
	case JSMN_SUCCESS:
		return "Success";
	default:
		return "Unknown json error";
	}
}
OpenPOWER on IntegriCloud