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Feature Request: 2903802.

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If you need to add an existing cJSON to a new object, but the existing object
must not be affected by this, use cJSON_AddItemReferenceTo<Array|Object>.

This will make a "reference" to the existing object (which is what you really mean to do),
and allow you to use it with a new object without fear of names being corrupted or things
being deleted.

Think of it like a reference, since that's pretty much what it is.
If you modify the resulting object (i.e. you AddItemReference, then retrieve with GetObjectItem,
and then start adding/replacing) you'll modify the object you pass in (in other words, this
doesn't clone everything, since that would probably end up being wasteful of space), however,
if you add it, and treat it as if it were const, everything will be fine!
 


git-svn-id: http://svn.code.sf.net/p/cjson/code@20 e3330c51-1366-4df0-8b21-3ccf24e3d50e
This commit is contained in:
Dave Gamble 2009-11-25 16:52:07 +00:00
parent c4e8954eb2
commit 29b085bc5d
2 changed files with 15 additions and 4 deletions
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11
cJSON.c
View File

@ -77,8 +77,8 @@ void cJSON_Delete(cJSON *c)
while (c)
{
next=c->next;
if (c->child) cJSON_Delete(c->child);
if (c->valuestring) cJSON_free(c->valuestring);
if (!(c->type&cJSON_IsReference) && c->child) cJSON_Delete(c->child);
if (!(c->type&cJSON_IsReference) && c->valuestring) cJSON_free(c->valuestring);
if (c->string) cJSON_free(c->string);
cJSON_free(c);
c=next;
@ -257,7 +257,7 @@ static const char *parse_value(cJSON *item,const char *value)
static char *print_value(cJSON *item,int depth,int fmt)
{
char *out=0;
switch (item->type)
switch ((item->type)&255)
{
case cJSON_NULL: out=cJSON_strdup("null"); break;
case cJSON_False: out=cJSON_strdup("false");break;
@ -449,10 +449,15 @@ cJSON *cJSON_GetObjectItem(cJSON *object,const char *string) {cJSON *c=object->c
// Utility for array list handling.
static void suffix_object(cJSON *prev,cJSON *item) {prev->next=item;item->prev=prev;}
// Utility for handling references.
static cJSON *create_reference(cJSON *item) {cJSON *ref=cJSON_New_Item();memcpy(ref,item,sizeof(cJSON));ref->string=0;ref->type|=cJSON_IsReference;ref->next=ref->prev=0;return ref;}
// Add item to array/object.
void cJSON_AddItemToArray(cJSON *array, cJSON *item) {cJSON *c=array->child;if (!c) {array->child=item;} else {while (c && c->next) c=c->next; suffix_object(c,item);}}
void cJSON_AddItemToObject(cJSON *object,const char *string,cJSON *item) {if (item->string) cJSON_free(item->string);item->string=cJSON_strdup(string);cJSON_AddItemToArray(object,item);}
void cJSON_AddItemReferenceToArray(cJSON *array, cJSON *item) {cJSON_AddItemToArray(array,create_reference(item));}
void cJSON_AddItemReferenceToObject(cJSON *object,const char *string,cJSON *item) {cJSON_AddItemToObject(object,string,create_reference(item));}
// Replace array/object items with new ones.
void cJSON_ReplaceItemInArray(cJSON *array,int which,cJSON *newitem) {cJSON *c=array->child;while (c && which>0) c=c->next,which--;if (!c) return;

6
cJSON.h
View File

@ -37,6 +37,8 @@ extern "C"
#define cJSON_Array 5
#define cJSON_Object 6
#define cJSON_IsReference 256
// The cJSON structure:
typedef struct cJSON {
struct cJSON *next,*prev; // next/prev allow you to walk array/object chains. Alternatively, use GetArraySize/GetArrayItem/GetObjectItem
@ -94,6 +96,10 @@ extern cJSON *cJSON_CreateStringArray(const char **strings,int count);
// Append item to the specified array/object.
extern void cJSON_AddItemToArray(cJSON *array, cJSON *item);
extern 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.
extern void cJSON_AddItemReferenceToArray(cJSON *array, cJSON *item);
extern void cJSON_AddItemReferenceToObject(cJSON *object,const char *string,cJSON *item);
// Update array items.
extern void cJSON_ReplaceItemInArray(cJSON *array,int which,cJSON *newitem);