main: use reference counting to manage ptrArray objects

cvx operator may require the way to share an array object within
EsObjects.

Signed-off-by: Masatake YAMATO <[email protected]>

Author: masatake

main/ptrarray.c

@@ -27,6 +27,7 @@ struct sPtrArray {
 	unsigned int max;
 	unsigned int count;
 	void **array;
+	int refcount;
 	ptrArrayDeleteFunc deleteFunc;
 };
 
@@ -40,6 +41,7 @@ extern ptrArray *ptrArrayNew (ptrArrayDeleteFunc deleteFunc)
 	result->max = 8;
 	result->count = 0;
 	result->array = xMalloc (result->max, void*);
+	result->refcount = 1;
 	result->deleteFunc = deleteFunc;
 	return result;
 }
@@ -145,10 +147,20 @@ extern void ptrArrayClear (ptrArray *const current)
 	current->count = 0;
 }
 
-extern void ptrArrayDelete (ptrArray *const current)
+extern void ptrArrayRef (ptrArray *const current)
+{
+	current->refcount++;
+}
+
+extern void ptrArrayUnref (ptrArray *const current)
 {
 	if (current != NULL)
 	{
+		current->refcount--;
+		if (current->refcount > 0)
+			return;
+		Assert(current->refcount == 0);
+
 		ptrArrayClear (current);
 		eFree (current->array);
 		eFree (current);

main/ptrarray.h

@@ -41,7 +41,9 @@ extern unsigned int ptrArrayCount (const ptrArray *const current);
 extern void* ptrArrayItem (const ptrArray *const current, const unsigned int indx);
 extern void* ptrArrayItemFromLast (const ptrArray *const current, const unsigned int indx);
 #define ptrArrayLast(A) ptrArrayItemFromLast(A, 0)
-extern void ptrArrayDelete (ptrArray *const current);
+extern void ptrArrayUnref (ptrArray *const current);
+#define ptrArrayDelete ptrArrayUnref
+extern void ptrArrayRef(ptrArray *const current);
 extern bool ptrArrayHasTest (const ptrArray *const current,
 				  bool (*test)(const void *ptr, void *userData),
 				  void *userData);