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1 /*
2 * Copyright (c) 2009-2016 Petri Lehtinen <petri@digip.org>
3 *
4 * Jansson is free software; you can redistribute it and/or modify
5 * it under the terms of the MIT license. See LICENSE for details.
6 */
7
8 #ifndef JANSSON_H
9 #define JANSSON_H
10
11 #include <stdarg.h>
12 #include <stdio.h>
13 #include <stdlib.h> /* for size_t */
14
15 #include "jansson_config.h"
16
17 #ifdef __cplusplus
18 extern "C" {
19 #endif
20
21 /* version */
22
23 #define JANSSON_MAJOR_VERSION 2
24 #define JANSSON_MINOR_VERSION 14
25 #define JANSSON_MICRO_VERSION 0
26
27 /* Micro version is omitted if it's 0 */
28 #define JANSSON_VERSION "2.14"
29
30 /* Version as a 3-byte hex number, e.g. 0x010201 == 1.2.1. Use this
31 for numeric comparisons, e.g. #if JANSSON_VERSION_HEX >= ... */
32 #define JANSSON_VERSION_HEX \
33 ((JANSSON_MAJOR_VERSION << 16) | (JANSSON_MINOR_VERSION << 8) | \
34 (JANSSON_MICRO_VERSION << 0))
35
36 /* If __atomic or __sync builtins are available the library is thread
37 * safe for all read-only functions plus reference counting. */
38 #if JSON_HAVE_ATOMIC_BUILTINS || JSON_HAVE_SYNC_BUILTINS
39 #define JANSSON_THREAD_SAFE_REFCOUNT 1
40 #endif
41
42 #if defined(__GNUC__) || defined(__clang__)
43 #define JANSSON_ATTRS(x) __attribute__(x)
44 #else
45 #define JANSSON_ATTRS(x)
46 #endif
47
48 /* types */
49
50 typedef enum {
51 JSON_OBJECT,
52 JSON_ARRAY,
53 JSON_STRING,
54 JSON_INTEGER,
55 JSON_REAL,
56 JSON_TRUE,
57 JSON_FALSE,
58 JSON_NULL
59 } json_type;
60
61 typedef struct json_t {
62 json_type type;
63 volatile size_t refcount;
64 } json_t;
65
66 #ifndef JANSSON_USING_CMAKE /* disabled if using cmake */
67 #if JSON_INTEGER_IS_LONG_LONG
68 #ifdef _WIN32
69 #define JSON_INTEGER_FORMAT "I64d"
70 #else
71 #define JSON_INTEGER_FORMAT "lld"
72 #endif
73 typedef long long json_int_t;
74 #else
75 #define JSON_INTEGER_FORMAT "ld"
76 typedef long json_int_t;
77 #endif /* JSON_INTEGER_IS_LONG_LONG */
78 #endif
79
80 #define json_typeof(json) ((json)->type)
81 #define json_is_object(json) ((json) && json_typeof(json) == JSON_OBJECT)
82 #define json_is_array(json) ((json) && json_typeof(json) == JSON_ARRAY)
83 #define json_is_string(json) ((json) && json_typeof(json) == JSON_STRING)
84 #define json_is_integer(json) ((json) && json_typeof(json) == JSON_INTEGER)
85 #define json_is_real(json) ((json) && json_typeof(json) == JSON_REAL)
86 #define json_is_number(json) (json_is_integer(json) || json_is_real(json))
87 #define json_is_true(json) ((json) && json_typeof(json) == JSON_TRUE)
88 #define json_is_false(json) ((json) && json_typeof(json) == JSON_FALSE)
89 #define json_boolean_value json_is_true
90 #define json_is_boolean(json) (json_is_true(json) || json_is_false(json))
91 #define json_is_null(json) ((json) && json_typeof(json) == JSON_NULL)
92
93 /* construction, destruction, reference counting */
94
95 json_t *json_object(void);
96 json_t *json_array(void);
97 json_t *json_string(const char *value);
98 json_t *json_stringn(const char *value, size_t len);
99 json_t *json_string_nocheck(const char *value);
100 json_t *json_stringn_nocheck(const char *value, size_t len);
101 json_t *json_integer(json_int_t value);
102 json_t *json_real(double value);
103 json_t *json_true(void);
104 json_t *json_false(void);
105 #define json_boolean(val) ((val) ? json_true() : json_false())
106 json_t *json_null(void);
107
108 /* do not call JSON_INTERNAL_INCREF or JSON_INTERNAL_DECREF directly */
109 #if JSON_HAVE_ATOMIC_BUILTINS
110 #define JSON_INTERNAL_INCREF(json) \
111 __atomic_add_fetch(&json->refcount, 1, __ATOMIC_ACQUIRE)
112 #define JSON_INTERNAL_DECREF(json) \
113 __atomic_sub_fetch(&json->refcount, 1, __ATOMIC_RELEASE)
114 #elif JSON_HAVE_SYNC_BUILTINS
115 #define JSON_INTERNAL_INCREF(json) __sync_add_and_fetch(&json->refcount, 1)
116 #define JSON_INTERNAL_DECREF(json) __sync_sub_and_fetch(&json->refcount, 1)
117 #else
118 #define JSON_INTERNAL_INCREF(json) (++json->refcount)
119 #define JSON_INTERNAL_DECREF(json) (--json->refcount)
120 #endif
121
122 static JSON_INLINE json_t *json_incref(json_t *json) {
123 if (json && json->refcount != (size_t)-1)
124 JSON_INTERNAL_INCREF(json);
125 return json;
126 }
127
128 /* do not call json_delete directly */
129 void json_delete(json_t *json);
130
131 static JSON_INLINE void json_decref(json_t *json) {
132 if (json && json->refcount != (size_t)-1 && JSON_INTERNAL_DECREF(json) == 0)
133 json_delete(json);
134 }
135
136 #if defined(__GNUC__) || defined(__clang__)
137 static JSON_INLINE void json_decrefp(json_t **json) {
138 if (json) {
139 json_decref(*json);
140 *json = NULL;
141 }
142 }
143
144 #define json_auto_t json_t __attribute__((cleanup(json_decrefp)))
145 #endif
146
147 /* error reporting */
148
149 #define JSON_ERROR_TEXT_LENGTH 160
150 #define JSON_ERROR_SOURCE_LENGTH 80
151
152 typedef struct json_error_t {
153 int line;
154 int column;
155 int position;
156 char source[JSON_ERROR_SOURCE_LENGTH];
157 char text[JSON_ERROR_TEXT_LENGTH];
158 } json_error_t;
159
160 enum json_error_code {
161 json_error_unknown,
162 json_error_out_of_memory,
163 json_error_stack_overflow,
164 json_error_cannot_open_file,
165 json_error_invalid_argument,
166 json_error_invalid_utf8,
167 json_error_premature_end_of_input,
168 json_error_end_of_input_expected,
169 json_error_invalid_syntax,
170 json_error_invalid_format,
171 json_error_wrong_type,
172 json_error_null_character,
173 json_error_null_value,
174 json_error_null_byte_in_key,
175 json_error_duplicate_key,
176 json_error_numeric_overflow,
177 json_error_item_not_found,
178 json_error_index_out_of_range
179 };
180
181 static JSON_INLINE enum json_error_code json_error_code(const json_error_t *e) {
182 return (enum json_error_code)e->text[JSON_ERROR_TEXT_LENGTH - 1];
183 }
184
185 /* getters, setters, manipulation */
186
187 void json_object_seed(size_t seed);
188 size_t json_object_size(const json_t *object);
189 json_t *json_object_get(const json_t *object, const char *key)
190 JANSSON_ATTRS((warn_unused_result));
191 json_t *json_object_getn(const json_t *object, const char *key, size_t key_len)
192 JANSSON_ATTRS((warn_unused_result));
193 int json_object_set_new(json_t *object, const char *key, json_t *value);
194 int json_object_setn_new(json_t *object, const char *key, size_t key_len, json_t *value);
195 int json_object_set_new_nocheck(json_t *object, const char *key, json_t *value);
196 int json_object_setn_new_nocheck(json_t *object, const char *key, size_t key_len,
197 json_t *value);
198 int json_object_del(json_t *object, const char *key);
199 int json_object_deln(json_t *object, const char *key, size_t key_len);
200 int json_object_clear(json_t *object);
201 int json_object_update(json_t *object, json_t *other);
202 int json_object_update_existing(json_t *object, json_t *other);
203 int json_object_update_missing(json_t *object, json_t *other);
204 int json_object_update_recursive(json_t *object, json_t *other);
205 void *json_object_iter(json_t *object);
206 void *json_object_iter_at(json_t *object, const char *key);
207 void *json_object_key_to_iter(const char *key);
208 void *json_object_iter_next(json_t *object, void *iter);
209 const char *json_object_iter_key(void *iter);
210 size_t json_object_iter_key_len(void *iter);
211 json_t *json_object_iter_value(void *iter);
212 int json_object_iter_set_new(json_t *object, void *iter, json_t *value);
213
214 #define json_object_foreach(object, key, value) \
215 for (key = json_object_iter_key(json_object_iter(object)); \
216 key && (value = json_object_iter_value(json_object_key_to_iter(key))); \
217 key = json_object_iter_key( \
218 json_object_iter_next(object, json_object_key_to_iter(key))))
219
220 #define json_object_keylen_foreach(object, key, key_len, value) \
221 for (key = json_object_iter_key(json_object_iter(object)), \
222 key_len = json_object_iter_key_len(json_object_key_to_iter(key)); \
223 key && (value = json_object_iter_value(json_object_key_to_iter(key))); \
224 key = json_object_iter_key( \
225 json_object_iter_next(object, json_object_key_to_iter(key))), \
226 key_len = json_object_iter_key_len(json_object_key_to_iter(key)))
227
228 #define json_object_foreach_safe(object, n, key, value) \
229 for (key = json_object_iter_key(json_object_iter(object)), \
230 n = json_object_iter_next(object, json_object_key_to_iter(key)); \
231 key && (value = json_object_iter_value(json_object_key_to_iter(key))); \
232 key = json_object_iter_key(n), \
233 n = json_object_iter_next(object, json_object_key_to_iter(key)))
234
235 #define json_object_keylen_foreach_safe(object, n, key, key_len, value) \
236 for (key = json_object_iter_key(json_object_iter(object)), \
237 n = json_object_iter_next(object, json_object_key_to_iter(key)), \
238 key_len = json_object_iter_key_len(json_object_key_to_iter(key)); \
239 key && (value = json_object_iter_value(json_object_key_to_iter(key))); \
240 key = json_object_iter_key(n), key_len = json_object_iter_key_len(n), \
241 n = json_object_iter_next(object, json_object_key_to_iter(key)))
242
243 #define json_array_foreach(array, index, value) \
244 for (index = 0; \
245 index < json_array_size(array) && (value = json_array_get(array, index)); \
246 index++)
247
248 static JSON_INLINE int json_object_set(json_t *object, const char *key, json_t *value) {
249 return json_object_set_new(object, key, json_incref(value));
250 }
251
252 static JSON_INLINE int json_object_setn(json_t *object, const char *key, size_t key_len,
253 json_t *value) {
254 return json_object_setn_new(object, key, key_len, json_incref(value));
255 }
256
257 static JSON_INLINE int json_object_set_nocheck(json_t *object, const char *key,
258 json_t *value) {
259 return json_object_set_new_nocheck(object, key, json_incref(value));
260 }
261
262 static JSON_INLINE int json_object_setn_nocheck(json_t *object, const char *key,
263 size_t key_len, json_t *value) {
264 return json_object_setn_new_nocheck(object, key, key_len, json_incref(value));
265 }
266
267 static JSON_INLINE int json_object_iter_set(json_t *object, void *iter, json_t *value) {
268 return json_object_iter_set_new(object, iter, json_incref(value));
269 }
270
271 static JSON_INLINE int json_object_update_new(json_t *object, json_t *other) {
272 int ret = json_object_update(object, other);
273 json_decref(other);
274 return ret;
275 }
276
277 static JSON_INLINE int json_object_update_existing_new(json_t *object, json_t *other) {
278 int ret = json_object_update_existing(object, other);
279 json_decref(other);
280 return ret;
281 }
282
283 static JSON_INLINE int json_object_update_missing_new(json_t *object, json_t *other) {
284 int ret = json_object_update_missing(object, other);
285 json_decref(other);
286 return ret;
287 }
288
289 size_t json_array_size(const json_t *array);
290 json_t *json_array_get(const json_t *array, size_t index)
291 JANSSON_ATTRS((warn_unused_result));
292 int json_array_set_new(json_t *array, size_t index, json_t *value);
293 int json_array_append_new(json_t *array, json_t *value);
294 int json_array_insert_new(json_t *array, size_t index, json_t *value);
295 int json_array_remove(json_t *array, size_t index);
296 int json_array_clear(json_t *array);
297 int json_array_extend(json_t *array, json_t *other);
298
299 static JSON_INLINE int json_array_set(json_t *array, size_t ind, json_t *value) {
300 return json_array_set_new(array, ind, json_incref(value));
301 }
302
303 static JSON_INLINE int json_array_append(json_t *array, json_t *value) {
304 return json_array_append_new(array, json_incref(value));
305 }
306
307 static JSON_INLINE int json_array_insert(json_t *array, size_t ind, json_t *value) {
308 return json_array_insert_new(array, ind, json_incref(value));
309 }
310
311 const char *json_string_value(const json_t *string);
312 size_t json_string_length(const json_t *string);
313 json_int_t json_integer_value(const json_t *integer);
314 double json_real_value(const json_t *real);
315 double json_number_value(const json_t *json);
316
317 int json_string_set(json_t *string, const char *value);
318 int json_string_setn(json_t *string, const char *value, size_t len);
319 int json_string_set_nocheck(json_t *string, const char *value);
320 int json_string_setn_nocheck(json_t *string, const char *value, size_t len);
321 int json_integer_set(json_t *integer, json_int_t value);
322 int json_real_set(json_t *real, double value);
323
324 /* pack, unpack */
325
326 json_t *json_pack(const char *fmt, ...) JANSSON_ATTRS((warn_unused_result));
327 json_t *json_pack_ex(json_error_t *error, size_t flags, const char *fmt, ...)
328 JANSSON_ATTRS((warn_unused_result));
329 json_t *json_vpack_ex(json_error_t *error, size_t flags, const char *fmt, va_list ap)
330 JANSSON_ATTRS((warn_unused_result));
331
332 #define JSON_VALIDATE_ONLY 0x1
333 #define JSON_STRICT 0x2
334
335 int json_unpack(json_t *root, const char *fmt, ...);
336 int json_unpack_ex(json_t *root, json_error_t *error, size_t flags, const char *fmt, ...);
337 int json_vunpack_ex(json_t *root, json_error_t *error, size_t flags, const char *fmt,
338 va_list ap);
339
340 /* sprintf */
341
342 json_t *json_sprintf(const char *fmt, ...)
343 JANSSON_ATTRS((warn_unused_result, format(printf, 1, 2)));
344 json_t *json_vsprintf(const char *fmt, va_list ap)
345 JANSSON_ATTRS((warn_unused_result, format(printf, 1, 0)));
346
347 /* equality */
348
349 int json_equal(const json_t *value1, const json_t *value2);
350
351 /* copying */
352
353 json_t *json_copy(json_t *value) JANSSON_ATTRS((warn_unused_result));
354 json_t *json_deep_copy(const json_t *value) JANSSON_ATTRS((warn_unused_result));
355
356 /* decoding */
357
358 #define JSON_REJECT_DUPLICATES 0x1
359 #define JSON_DISABLE_EOF_CHECK 0x2
360 #define JSON_DECODE_ANY 0x4
361 #define JSON_DECODE_INT_AS_REAL 0x8
362 #define JSON_ALLOW_NUL 0x10
363
364 typedef size_t (*json_load_callback_t)(void *buffer, size_t buflen, void *data);
365
366 json_t *json_loads(const char *input, size_t flags, json_error_t *error)
367 JANSSON_ATTRS((warn_unused_result));
368 json_t *json_loadb(const char *buffer, size_t buflen, size_t flags, json_error_t *error)
369 JANSSON_ATTRS((warn_unused_result));
370 json_t *json_loadf(FILE *input, size_t flags, json_error_t *error)
371 JANSSON_ATTRS((warn_unused_result));
372 json_t *json_loadfd(int input, size_t flags, json_error_t *error)
373 JANSSON_ATTRS((warn_unused_result));
374 json_t *json_load_file(const char *path, size_t flags, json_error_t *error)
375 JANSSON_ATTRS((warn_unused_result));
376 json_t *json_load_callback(json_load_callback_t callback, void *data, size_t flags,
377 json_error_t *error) JANSSON_ATTRS((warn_unused_result));
378
379 /* encoding */
380
381 #define JSON_MAX_INDENT 0x1F
382 #define JSON_INDENT(n) ((n)&JSON_MAX_INDENT)
383 #define JSON_COMPACT 0x20
384 #define JSON_ENSURE_ASCII 0x40
385 #define JSON_SORT_KEYS 0x80
386 #define JSON_PRESERVE_ORDER 0x100
387 #define JSON_ENCODE_ANY 0x200
388 #define JSON_ESCAPE_SLASH 0x400
389 #define JSON_REAL_PRECISION(n) (((n)&0x1F) << 11)
390 #define JSON_EMBED 0x10000
391
392 typedef int (*json_dump_callback_t)(const char *buffer, size_t size, void *data);
393
394 char *json_dumps(const json_t *json, size_t flags) JANSSON_ATTRS((warn_unused_result));
395 size_t json_dumpb(const json_t *json, char *buffer, size_t size, size_t flags);
396 int json_dumpf(const json_t *json, FILE *output, size_t flags);
397 int json_dumpfd(const json_t *json, int output, size_t flags);
398 int json_dump_file(const json_t *json, const char *path, size_t flags);
399 int json_dump_callback(const json_t *json, json_dump_callback_t callback, void *data,
400 size_t flags);
401
402 /* custom memory allocation */
403
404 typedef void *(*json_malloc_t)(size_t);
405 typedef void (*json_free_t)(void *);
406
407 void json_set_alloc_funcs(json_malloc_t malloc_fn, json_free_t free_fn);
408 void json_get_alloc_funcs(json_malloc_t *malloc_fn, json_free_t *free_fn);
409
410 /* runtime version checking */
411
412 const char *jansson_version_str(void);
413 int jansson_version_cmp(int major, int minor, int micro);
414
415 #ifdef __cplusplus
416 }
417 #endif
418
419 #endif