Actual source code: cJSON.h
1: /*
2: Copyright (c) 2009-2017 Dave Gamble and cJSON contributors
4: Permission is hereby granted, free of charge, to any person obtaining a copy
5: of this software and associated documentation files (the "Software"), to deal
6: in the Software without restriction, including without limitation the rights
7: to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
8: copies of the Software, and to permit persons to whom the Software is
9: furnished to do so, subject to the following conditions:
11: The above copyright notice and this permission notice shall be included in
12: all copies or substantial portions of the Software.
14: THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15: IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16: FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17: AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18: LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19: OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
20: THE SOFTWARE.
21: */
23: #pragma once
25: #ifdef __cplusplus
26: extern "C" {
27: #endif
31: #endif
33: #ifdef __WINDOWS__
35: /* When compiling for windows, we specify a specific calling convention to avoid issues where we are being called from a project with a different default calling convention. For windows you have 3 define options:
37: CJSON_HIDE_SYMBOLS - Define this in the case where you don't want to ever dllexport symbols
38: CJSON_EXPORT_SYMBOLS - Define this on library build when you want to dllexport symbols (default)
39: CJSON_IMPORT_SYMBOLS - Define this if you want to dllimport symbol
41: For *nix builds that support visibility attribute, you can define similar behavior by
43: setting default visibility to hidden by adding
44: -fvisibility=hidden (for gcc)
45: or
46: -xldscope=hidden (for sun cc)
47: to CFLAGS
49: then using the CJSON_API_VISIBILITY flag to "export" the same symbols the way CJSON_EXPORT_SYMBOLS does
51: */
53: #define CJSON_CDECL __cdecl
54: #define CJSON_STDCALL __stdcall
56: /* export symbols by default, this is necessary for copy pasting the C and header file */
57: #if !defined(CJSON_HIDE_SYMBOLS) && !defined(CJSON_IMPORT_SYMBOLS) && !defined(CJSON_EXPORT_SYMBOLS)
58: #define CJSON_EXPORT_SYMBOLS
59: #endif
61: #if defined(CJSON_HIDE_SYMBOLS)
62: #define CJSON_PUBLIC(type) type CJSON_STDCALL
63: #elif defined(CJSON_EXPORT_SYMBOLS)
64: #define CJSON_PUBLIC(type) __declspec(dllexport) type CJSON_STDCALL
65: #elif defined(CJSON_IMPORT_SYMBOLS)
66: #define CJSON_PUBLIC(type) __declspec(dllimport) type CJSON_STDCALL
67: #endif
68: #else /* !__WINDOWS__ */
69: #define CJSON_CDECL
70: #define CJSON_STDCALL
72: #if (defined(__GNUC__) || defined(__SUNPRO_CC) || defined(__SUNPRO_C)) && defined(CJSON_API_VISIBILITY)
73: #define CJSON_PUBLIC(type) __attribute__((visibility("default"))) type
74: #else
75: #define CJSON_PUBLIC(type) type
76: #endif
77: #endif
79: /* project version */
80: #define CJSON_VERSION_MAJOR 1
81: #define CJSON_VERSION_MINOR 7
82: #define CJSON_VERSION_PATCH 15
84: #include <stddef.h>
86: /* cJSON Types: */
87: #define cJSON_Invalid (0)
88: #define cJSON_False (1 << 0)
89: #define cJSON_True (1 << 1)
90: #define cJSON_NULL (1 << 2)
91: #define cJSON_Number (1 << 3)
92: #define cJSON_String (1 << 4)
93: #define cJSON_Array (1 << 5)
94: #define cJSON_Object (1 << 6)
95: #define cJSON_Raw (1 << 7) /* raw json */
97: #define cJSON_IsReference 256
98: #define cJSON_StringIsConst 512
100: /* The cJSON structure: */
101: typedef struct cJSON {
102: /* next/prev allow you to walk array/object chains. Alternatively, use GetArraySize/GetArrayItem/GetObjectItem */
103: struct cJSON *next;
104: struct cJSON *prev;
105: /* An array or object item will have a child pointer pointing to a chain of the items in the array/object. */
106: struct cJSON *child;
108: /* The type of the item, as above. */
109: int type;
111: /* The item's string, if type==cJSON_String and type == cJSON_Raw */
112: char *valuestring;
113: /* writing to valueint is DEPRECATED, use cJSON_SetNumberValue instead */
114: int valueint;
115: /* The item's number, if type==cJSON_Number */
116: double valuedouble;
118: /* The item's name string, if this item is the child of, or is in the list of subitems of an object. */
119: char *string;
120: } cJSON;
122: typedef struct cJSON_Hooks {
123: /* malloc/free are CDECL on Windows regardless of the default calling convention of the compiler, so ensure the hooks allow passing those functions directly. */
124: void *(CJSON_CDECL *malloc_fn)(size_t sz);
125: void(CJSON_CDECL *free_fn)(void *ptr);
126: } cJSON_Hooks;
128: typedef int cJSON_bool;
130: /* Limits how deeply nested arrays/objects can be before cJSON rejects to parse them.
131: * This is to prevent stack overflows. */
132: #ifndef CJSON_NESTING_LIMIT
133: #define CJSON_NESTING_LIMIT 1000
134: #endif
136: /* returns the version of cJSON as a string */
137: CJSON_PUBLIC(const char *) cJSON_Version(void);
139: /* Supply malloc, realloc and free functions to cJSON */
140: CJSON_PUBLIC(void) cJSON_InitHooks(cJSON_Hooks *hooks);
142: /* Memory Management: the caller is always responsible to free the results from all variants of cJSON_Parse (with cJSON_Delete) and cJSON_Print (with stdlib free, cJSON_Hooks.free_fn, or cJSON_free as appropriate). The exception is cJSON_PrintPreallocated, where the caller has full responsibility of the buffer. */
143: /* Supply a block of JSON, and this returns a cJSON object you can interrogate. */
144: CJSON_PUBLIC(cJSON *) cJSON_Parse(const char *value);
145: CJSON_PUBLIC(cJSON *) cJSON_ParseWithLength(const char *value, size_t buffer_length);
146: /* ParseWithOpts allows you to require (and check) that the JSON is null terminated, and to retrieve the pointer to the final byte parsed. */
147: /* If you supply a ptr in return_parse_end and parsing fails, then return_parse_end will contain a pointer to the error so will match cJSON_GetErrorPtr(). */
148: CJSON_PUBLIC(cJSON *) cJSON_ParseWithOpts(const char *value, const char **return_parse_end, cJSON_bool require_null_terminated);
149: CJSON_PUBLIC(cJSON *) cJSON_ParseWithLengthOpts(const char *value, size_t buffer_length, const char **return_parse_end, cJSON_bool require_null_terminated);
151: /* Render a cJSON entity to text for transfer/storage. */
152: CJSON_PUBLIC(char *) cJSON_Print(const cJSON *item);
153: /* Render a cJSON entity to text for transfer/storage without any formatting. */
154: CJSON_PUBLIC(char *) cJSON_PrintUnformatted(const cJSON *item);
155: /* Render a cJSON entity to text using a buffered strategy. prebuffer is a guess at the final size. guessing well reduces reallocation. fmt=0 gives unformatted, =1 gives formatted */
156: CJSON_PUBLIC(char *) cJSON_PrintBuffered(const cJSON *item, int prebuffer, cJSON_bool fmt);
157: /* Render a cJSON entity to text using a buffer already allocated in memory with given length. Returns 1 on success and 0 on failure. */
158: /* NOTE: cJSON is not always 100% accurate in estimating how much memory it will use, so to be safe allocate 5 bytes more than you actually need */
159: CJSON_PUBLIC(cJSON_bool) cJSON_PrintPreallocated(cJSON *item, char *buffer, const int length, const cJSON_bool format);
160: /* Delete a cJSON entity and all subentities. */
161: CJSON_PUBLIC(void) cJSON_Delete(cJSON *item);
163: /* Returns the number of items in an array (or object). */
164: CJSON_PUBLIC(int) cJSON_GetArraySize(const cJSON *array);
165: /* Retrieve item number "index" from array "array". Returns NULL if unsuccessful. */
166: CJSON_PUBLIC(cJSON *) cJSON_GetArrayItem(const cJSON *array, int index);
167: /* Get item "string" from object. Case insensitive. */
168: CJSON_PUBLIC(cJSON *) cJSON_GetObjectItem(const cJSON *const object, const char *const string);
169: CJSON_PUBLIC(cJSON *) cJSON_GetObjectItemCaseSensitive(const cJSON *const object, const char *const string);
170: CJSON_PUBLIC(cJSON_bool) cJSON_HasObjectItem(const cJSON *object, const char *string);
171: /* For analysing failed parses. This returns a pointer to the parse error. You'll probably need to look a few chars back to make sense of it. Defined when cJSON_Parse() returns 0. 0 when cJSON_Parse() succeeds. */
172: CJSON_PUBLIC(const char *) cJSON_GetErrorPtr(void);
174: /* Check item type and return its value */
175: CJSON_PUBLIC(char *) cJSON_GetStringValue(const cJSON *const item);
176: CJSON_PUBLIC(double) cJSON_GetNumberValue(const cJSON *const item);
178: /* These functions check the type of an item */
179: CJSON_PUBLIC(cJSON_bool) cJSON_IsInvalid(const cJSON *const item);
180: CJSON_PUBLIC(cJSON_bool) cJSON_IsFalse(const cJSON *const item);
181: CJSON_PUBLIC(cJSON_bool) cJSON_IsTrue(const cJSON *const item);
182: CJSON_PUBLIC(cJSON_bool) cJSON_IsBool(const cJSON *const item);
183: CJSON_PUBLIC(cJSON_bool) cJSON_IsNull(const cJSON *const item);
184: CJSON_PUBLIC(cJSON_bool) cJSON_IsNumber(const cJSON *const item);
185: CJSON_PUBLIC(cJSON_bool) cJSON_IsString(const cJSON *const item);
186: CJSON_PUBLIC(cJSON_bool) cJSON_IsArray(const cJSON *const item);
187: CJSON_PUBLIC(cJSON_bool) cJSON_IsObject(const cJSON *const item);
188: CJSON_PUBLIC(cJSON_bool) cJSON_IsRaw(const cJSON *const item);
190: /* These calls create a cJSON item of the appropriate type. */
191: CJSON_PUBLIC(cJSON *) cJSON_CreateNull(void);
192: CJSON_PUBLIC(cJSON *) cJSON_CreateTrue(void);
193: CJSON_PUBLIC(cJSON *) cJSON_CreateFalse(void);
194: CJSON_PUBLIC(cJSON *) cJSON_CreateBool(cJSON_bool boolean);
195: CJSON_PUBLIC(cJSON *) cJSON_CreateNumber(double num);
196: CJSON_PUBLIC(cJSON *) cJSON_CreateString(const char *string);
197: /* raw json */
198: CJSON_PUBLIC(cJSON *) cJSON_CreateRaw(const char *raw);
199: CJSON_PUBLIC(cJSON *) cJSON_CreateArray(void);
200: CJSON_PUBLIC(cJSON *) cJSON_CreateObject(void);
202: /* Create a string where valuestring references a string so
203: * it will not be freed by cJSON_Delete */
204: CJSON_PUBLIC(cJSON *) cJSON_CreateStringReference(const char *string);
205: /* Create an object/array that only references it's elements so
206: * they will not be freed by cJSON_Delete */
207: CJSON_PUBLIC(cJSON *) cJSON_CreateObjectReference(const cJSON *child);
208: CJSON_PUBLIC(cJSON *) cJSON_CreateArrayReference(const cJSON *child);
210: /* These utilities create an Array of count items.
211: * The parameter count cannot be greater than the number of elements in the number array, otherwise array access will be out of bounds.*/
212: CJSON_PUBLIC(cJSON *) cJSON_CreateIntArray(const int *numbers, int count);
213: CJSON_PUBLIC(cJSON *) cJSON_CreateFloatArray(const float *numbers, int count);
214: CJSON_PUBLIC(cJSON *) cJSON_CreateDoubleArray(const double *numbers, int count);
215: CJSON_PUBLIC(cJSON *) cJSON_CreateStringArray(const char *const *strings, int count);
217: /* Append item to the specified array/object. */
218: CJSON_PUBLIC(cJSON_bool) cJSON_AddItemToArray(cJSON *array, cJSON *item);
219: CJSON_PUBLIC(cJSON_bool) cJSON_AddItemToObject(cJSON *object, const char *string, cJSON *item);
220: /* Use this when string is definitely const (i.e. a literal, or as good as), and will definitely survive the cJSON object.
221: * WARNING: When this function was used, make sure to always check that (item->type & cJSON_StringIsConst) is zero before
222: * writing to `item->string` */
223: CJSON_PUBLIC(cJSON_bool) cJSON_AddItemToObjectCS(cJSON *object, const char *string, cJSON *item);
224: /* Append reference to item to the specified array/object. Use this when you want to add an existing cJSON to a new cJSON, but don't want to corrupt your existing cJSON. */
225: CJSON_PUBLIC(cJSON_bool) cJSON_AddItemReferenceToArray(cJSON *array, cJSON *item);
226: CJSON_PUBLIC(cJSON_bool) cJSON_AddItemReferenceToObject(cJSON *object, const char *string, cJSON *item);
228: /* Remove/Detach items from Arrays/Objects. */
229: CJSON_PUBLIC(cJSON *) cJSON_DetachItemViaPointer(cJSON *parent, cJSON *const item);
230: CJSON_PUBLIC(cJSON *) cJSON_DetachItemFromArray(cJSON *array, int which);
231: CJSON_PUBLIC(void) cJSON_DeleteItemFromArray(cJSON *array, int which);
232: CJSON_PUBLIC(cJSON *) cJSON_DetachItemFromObject(cJSON *object, const char *string);
233: CJSON_PUBLIC(cJSON *) cJSON_DetachItemFromObjectCaseSensitive(cJSON *object, const char *string);
234: CJSON_PUBLIC(void) cJSON_DeleteItemFromObject(cJSON *object, const char *string);
235: CJSON_PUBLIC(void) cJSON_DeleteItemFromObjectCaseSensitive(cJSON *object, const char *string);
237: /* Update array items. */
238: CJSON_PUBLIC(cJSON_bool) cJSON_InsertItemInArray(cJSON *array, int which, cJSON *newitem); /* Shifts pre-existing items to the right. */
239: CJSON_PUBLIC(cJSON_bool) cJSON_ReplaceItemViaPointer(cJSON *const parent, cJSON *const item, cJSON *replacement);
240: CJSON_PUBLIC(cJSON_bool) cJSON_ReplaceItemInArray(cJSON *array, int which, cJSON *newitem);
241: CJSON_PUBLIC(cJSON_bool) cJSON_ReplaceItemInObject(cJSON *object, const char *string, cJSON *newitem);
242: CJSON_PUBLIC(cJSON_bool) cJSON_ReplaceItemInObjectCaseSensitive(cJSON *object, const char *string, cJSON *newitem);
244: /* Duplicate a cJSON item */
245: CJSON_PUBLIC(cJSON *) cJSON_Duplicate(const cJSON *item, cJSON_bool recurse);
246: /* Duplicate will create a new, identical cJSON item to the one you pass, in new memory that will
247: * need to be released. With recurse!=0, it will duplicate any children connected to the item.
248: * The item->next and ->prev pointers are always zero on return from Duplicate. */
249: /* Recursively compare two cJSON items for equality. If either a or b is NULL or invalid, they will be considered unequal.
250: * case_sensitive determines if object keys are treated case sensitive (1) or case insensitive (0) */
251: CJSON_PUBLIC(cJSON_bool) cJSON_Compare(const cJSON *const a, const cJSON *const b, const cJSON_bool case_sensitive);
253: /* Minify a strings, remove blank characters(such as ' ', '\t', '\r', '\n') from strings.
254: * The input pointer json cannot point to a read-only address area, such as a string constant,
255: * but should point to a readable and writable address area. */
256: CJSON_PUBLIC(void) cJSON_Minify(char *json);
258: /* Helper functions for creating and adding items to an object at the same time.
259: * They return the added item or NULL on failure. */
260: CJSON_PUBLIC(cJSON *) cJSON_AddNullToObject(cJSON *const object, const char *const name);
261: CJSON_PUBLIC(cJSON *) cJSON_AddTrueToObject(cJSON *const object, const char *const name);
262: CJSON_PUBLIC(cJSON *) cJSON_AddFalseToObject(cJSON *const object, const char *const name);
263: CJSON_PUBLIC(cJSON *) cJSON_AddBoolToObject(cJSON *const object, const char *const name, const cJSON_bool boolean);
264: CJSON_PUBLIC(cJSON *) cJSON_AddNumberToObject(cJSON *const object, const char *const name, const double number);
265: CJSON_PUBLIC(cJSON *) cJSON_AddStringToObject(cJSON *const object, const char *const name, const char *const string);
266: CJSON_PUBLIC(cJSON *) cJSON_AddRawToObject(cJSON *const object, const char *const name, const char *const raw);
267: CJSON_PUBLIC(cJSON *) cJSON_AddObjectToObject(cJSON *const object, const char *const name);
268: CJSON_PUBLIC(cJSON *) cJSON_AddArrayToObject(cJSON *const object, const char *const name);
270: /* When assigning an integer value, it needs to be propagated to valuedouble too. */
271: #define cJSON_SetIntValue(object, number) ((object) ? (object)->valueint = (object)->valuedouble = (number) : (number))
272: /* helper for the cJSON_SetNumberValue macro */
273: CJSON_PUBLIC(double) cJSON_SetNumberHelper(cJSON *object, double number);
274: #define cJSON_SetNumberValue(object, number) ((object != NULL) ? cJSON_SetNumberHelper(object, (double)number) : (number))
275: /* Change the valuestring of a cJSON_String object, only takes effect when type of object is cJSON_String */
276: CJSON_PUBLIC(char *) cJSON_SetValuestring(cJSON *object, const char *valuestring);
278: /* If the object is not a boolean type this does nothing and returns cJSON_Invalid else it returns the new type*/
279: #define cJSON_SetBoolValue(object, boolValue) ((object != NULL && ((object)->type & (cJSON_False | cJSON_True))) ? (object)->type = ((object)->type & (~(cJSON_False | cJSON_True))) | ((boolValue) ? cJSON_True : cJSON_False) : cJSON_Invalid)
281: /* Macro for iterating over an array or object */
282: #define cJSON_ArrayForEach(element, array) for (element = (array != NULL) ? (array)->child : NULL; element != NULL; element = element->next)
284: /* malloc/free objects using the malloc/free functions that have been set with cJSON_InitHooks */
285: CJSON_PUBLIC(void *) cJSON_malloc(size_t size);
286: CJSON_PUBLIC(void) cJSON_free(void *object);
288: #ifdef __cplusplus
289: }
290: #endif