cJSON: provide support for adding header to functions

This avoids conflicts between overlapping libs that use different cJSON
implementations.

Many thanks to He Huang from Five9 for reporting and providing tests

(cherry picked from commit 3a891b9)

lib/cJSON.h

@@ -30,6 +30,64 @@ extern "C"
 {
 #endif
 
+#ifdef CJSON_PREFIX
+
+/* helpers */
+#define cjson_prefix2(X, Y) X ## Y
+#define cjson_prefix(X, Y) cjson_prefix2(X, Y)
+/* structures */
+#define cJSON cjson_prefix(CJSON_PREFIX, cJSON)
+#define cJSON_Hooks cjson_prefix(CJSON_PREFIX, cJSON_Hooks)
+/* functions */
+#define cJSON_Version cjson_prefix(CJSON_PREFIX, cJSON_Version)
+#define cJSON_InitHooks cjson_prefix(CJSON_PREFIX, cJSON_InitHooks)
+#define cJSON_Parse cjson_prefix(CJSON_PREFIX, cJSON_Parse)
+#define cJSON_Print cjson_prefix(CJSON_PREFIX, cJSON_Print)
+#define cJSON_PurgeString cjson_prefix(CJSON_PREFIX, cJSON_PurgeString)
+#define cJSON_PrintUnformatted cjson_prefix(CJSON_PREFIX, cJSON_PrintUnformatted)
+#define cJSON_PrintBuffered cjson_prefix(CJSON_PREFIX, cJSON_PrintBuffered)
+#define cJSON_PrintPreallocated cjson_prefix(CJSON_PREFIX, cJSON_PrintPreallocated)
+#define cJSON_PrintFlushed cjson_prefix(CJSON_PREFIX, cJSON_PrintFlushed)
+#define cJSON_Delete cjson_prefix(CJSON_PREFIX, cJSON_Delete)
+#define cJSON_GetArraySize cjson_prefix(CJSON_PREFIX, cJSON_GetArraySize)
+#define cJSON_GetArrayItem cjson_prefix(CJSON_PREFIX, cJSON_GetArrayItem)
+#define cJSON_GetObjectItem cjson_prefix(CJSON_PREFIX, cJSON_GetObjectItem)
+#define cJSON_HasObjectItem cjson_prefix(CJSON_PREFIX, cJSON_HasObjectItem)
+#define cJSON_GetErrorPtr cjson_prefix(CJSON_PREFIX, cJSON_GetErrorPtr)
+#define cJSON_CreateNull cjson_prefix(CJSON_PREFIX, cJSON_CreateNull)
+#define cJSON_CreateTrue cjson_prefix(CJSON_PREFIX, cJSON_CreateTrue)
+#define cJSON_CreateFalse cjson_prefix(CJSON_PREFIX, cJSON_CreateFalse)
+#define cJSON_CreateBool cjson_prefix(CJSON_PREFIX, cJSON_CreateBool)
+#define cJSON_CreateNumber cjson_prefix(CJSON_PREFIX, cJSON_CreateNumber)
+#define cJSON_CreateString cjson_prefix(CJSON_PREFIX, cJSON_CreateString)
+#define cJSON_CreateStr cjson_prefix(CJSON_PREFIX, cJSON_CreateStr)
+#define cJSON_CreateRaw cjson_prefix(CJSON_PREFIX, cJSON_CreateRaw)
+#define cJSON_CreateArray cjson_prefix(CJSON_PREFIX, cJSON_CreateArray)
+#define cJSON_CreateObject cjson_prefix(CJSON_PREFIX, cJSON_CreateObject)
+#define cJSON_CreateIntArray cjson_prefix(CJSON_PREFIX, cJSON_CreateIntArray)
+#define cJSON_CreateFloatArray cjson_prefix(CJSON_PREFIX, cJSON_CreateFloatArray)
+#define cJSON_CreateDoubleArray cjson_prefix(CJSON_PREFIX, cJSON_CreateDoubleArray)
+#define cJSON_CreateStringArray cjson_prefix(CJSON_PREFIX, cJSON_CreateStringArray)
+#define cJSON_AddItemToArray cjson_prefix(CJSON_PREFIX, cJSON_AddItemToArray)
+#define _cJSON_AddItemToObject cjson_prefix(CJSON_PREFIX, _cJSON_AddItemToObject)
+#define cJSON_AddItemToObject cjson_prefix(CJSON_PREFIX, cJSON_AddItemToObject)
+#define cJSON_AddItemToObjectCS cjson_prefix(CJSON_PREFIX, cJSON_AddItemToObjectCS)
+#define cJSON_AddItemReferenceToArray cjson_prefix(CJSON_PREFIX, cJSON_AddItemReferenceToArray)
+#define cJSON_AddItemReferenceToObject cjson_prefix(CJSON_PREFIX, cJSON_AddItemReferenceToObject)
+#define cJSON_DetachItemFromArray cjson_prefix(CJSON_PREFIX, cJSON_DetachItemFromArray)
+#define cJSON_DeleteItemFromArray cjson_prefix(CJSON_PREFIX, cJSON_DeleteItemFromArray)
+#define cJSON_DetachItemFromObject cjson_prefix(CJSON_PREFIX, cJSON_DetachItemFromObject)
+#define cJSON_DeleteItemFromObject cjson_prefix(CJSON_PREFIX, cJSON_DeleteItemFromObject)
+#define cJSON_InsertItemInArray cjson_prefix(CJSON_PREFIX, cJSON_InsertItemInArray)
+#define cJSON_ReplaceItemInArray cjson_prefix(CJSON_PREFIX, cJSON_ReplaceItemInArray)
+#define cJSON_ReplaceItemInObject cjson_prefix(CJSON_PREFIX, cJSON_ReplaceItemInObject)
+#define cJSON_Duplicate cjson_prefix(CJSON_PREFIX, cJSON_Duplicate)
+#define cJSON_ParseWithOpts cjson_prefix(CJSON_PREFIX, cJSON_ParseWithOpts)
+#define cJSON_Minify cjson_prefix(CJSON_PREFIX, cJSON_Minify)
+#define cJSON_SetNumberHelper cjson_prefix(CJSON_PREFIX, cJSON_SetNumberHelper)
+#define cJSON_NumberIsInt cjson_prefix(CJSON_PREFIX, cJSON_NumberIsInt)
+#endif /* CJSON_PREFIX */
+
 /* project version */
 #define CJSON_VERSION_MAJOR 1
 #define CJSON_VERSION_MINOR 2