text: /****************************************************************************
   * apps/netutils/json/cJSON.c
   *
   * This file is a part of NuttX:
   *
   *   Copyright (C) 2011 Gregory Nutt. All rights reserved.
   *   Ported by: Darcy Gong
   *
   * And derives from the cJSON Project which has an MIT license:
   *
   *   Copyright (c) 2009 Dave Gamble
   *
   * 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.
   *
   ****************************************************************************/
  
  #ifndef __APPS_INCLUDE_NETUTILS_JSON_H
  #define __APPS_INCLUDE_NETUTILS_JSON_H
  
  #ifdef __cplusplus
  extern "C"
  {
  #endif
  
  /****************************************************************************
   * Included Files
   ****************************************************************************/
  
  /****************************************************************************
   * Pre-processor Definitions
   ****************************************************************************/
  
  #define cJSON_False  0
  #define cJSON_True   1
  #define cJSON_NULL   2
  #define cJSON_Number 3
  #define cJSON_String 4
  #define cJSON_Array  5
  #define cJSON_Object 6
    
  #define cJSON_IsReference 256
  
  #define cJSON_AddNullToObject(object,name) \
    cJSON_AddItemToObject(object, name, cJSON_CreateNull())
  #define cJSON_AddTrueToObject(object,name) \
    cJSON_AddItemToObject(object, name, cJSON_CreateTrue())cd 
  #define cJSON_AddFalseToObject(object,name) \
    cJSON_AddItemToObject(object, name, cJSON_CreateFalse())
  #define cJSON_AddNumberToObject(object,name,n) \
    cJSON_AddItemToObject(object, name, cJSON_CreateNumber(n))
  #define cJSON_AddStringToObject(object,name,s) \
    cJSON_AddItemToObject(object, name, cJSON_CreateString(s))
  
  /****************************************************************************
   * Public Types
   ****************************************************************************/
  
  /* The cJSON structure: */
  
  typedef struct cJSON
  {
    /* next/prev allow you to walk array/object chains. Alternatively, use
     * GetArraySize/GetArrayItem/GetObjectItem
     */
  
    struct cJSON *next,*prev;  
  
    /* An array or object item will have a child pointer pointing to a chain
     * of the items in the array/object.
     */
  
    struct cJSON *child;    
  
    int type;               /* The type of the item, as above. */
    char *valuestring;      /* The item's string, if type==cJSON_String */
    int valueint;           /* The item's number, if type==cJSON_Number */
    double valuedouble;     /* The item's number, if type==cJSON_Number */
  
    /* The item's name string, if this item is the child of, or is in the list
     * of subitems of an object.
     */
  
    char *string;
  } cJSON;
  
  typedef struct cJSON_Hooks
  {
    void *(*malloc_fn)(size_t sz);
    void (*free_fn)(void *ptr);
  } cJSON_Hooks;
  
  /****************************************************************************
   * Public Functions
   ****************************************************************************/
  
  /* Supply malloc, realloc and free functions to cJSON */
  
  void cJSON_InitHooks(cJSON_Hooks* hooks);
  
  /* Supply a block of JSON, and this returns a cJSON object you can
   * interrogate. Call cJSON_Delete when finished.
   */
  
  cJSON *cJSON_Parse(const char *value);
  
  /* Render a cJSON entity to text for transfer/storage. Free the char* when
   * finished.
   */
  
  char *cJSON_Print(cJSON *item);
  
  /* Render a cJSON entity to text for transfer/storage without any
   * formatting. Free the char* when finished.
   */
  
  char *cJSON_PrintUnformatted(cJSON *item);
  
  /* Delete a cJSON entity and all subentities. */
  
  void cJSON_Delete(cJSON *c);
  
  /* Returns the number of items in an array (or object). */
  
  int cJSON_GetArraySize(cJSON *array);
  
  /* Retrieve item number "item" from array "array". Returns NULL if
   * unsuccessful.
   */
  
  cJSON *cJSON_GetArrayItem(cJSON *array, int item);
  
  /* Get item "string" from object. Case insensitive. */
  
  cJSON *cJSON_GetObjectItem(cJSON *object, const char *string);
  
  /* 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.
   */
  
  const char *cJSON_GetErrorPtr();
    
  /* These calls create a cJSON item of the appropriate type. */
  
  cJSON *cJSON_CreateNull();
  cJSON *cJSON_CreateTrue();
  cJSON *cJSON_CreateFalse();
  cJSON *cJSON_CreateBool(int b);
  cJSON *cJSON_CreateNumber(double num);
  cJSON *cJSON_CreateString(const char *string);
  cJSON *cJSON_CreateArray();
  cJSON *cJSON_CreateObject();
  
  /* These utilities create an Array of count items. */
  
  cJSON *cJSON_CreateIntArray(const int *numbers, int count);
  cJSON *cJSON_CreateFloatArray(const float *numbers, int count);
  cJSON *cJSON_CreateDoubleArray(const double *numbers, int count);
  cJSON *cJSON_CreateStringArray(const char **strings, int count);
  
  /* Append item to the specified array/object. */
  
  void cJSON_AddItemToArray(cJSON *array, cJSON *item);
  void cJSON_AddItemToObject(cJSON *object, const char *string, cJSON *item);
  
  /* 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.
   */
  
  void cJSON_AddItemReferenceToArray(cJSON *array, cJSON *item);
  void cJSON_AddItemReferenceToObject(cJSON *object, const char *string, cJSON *item);
  
  /* Remove/Detatch items from Arrays/Objects. */
  
  cJSON *cJSON_DetachItemFromArray(cJSON *array, int which);
  void cJSON_DeleteItemFromArray(cJSON *array, int which);
  cJSON *cJSON_DetachItemFromObject(cJSON *object, const char *string);
  void cJSON_DeleteItemFromObject(cJSON *object, const char *string);
    
  /* Update array items. */
  
  void cJSON_ReplaceItemInArray(cJSON *array, int which, cJSON *newitem);
  void cJSON_ReplaceItemInObject(cJSON *object, const char *string, cJSON *newitem);
  
  #ifdef __cplusplus
  }
  #endif
  
  #endif /* __APPS_INCLUDE_NETUTILS_JSON_H */
  