diff --git a/include/rjp.h b/include/rjp.h
index dc9198f..b0cf144 100644
--- a/include/rjp.h
+++ b/include/rjp.h
@@ -113,6 +113,10 @@ typedef struct RJP_parse_error{
 	int errcode;
 	int row, column;
 }RJP_parse_error;
+typedef struct RJP_memory_fns{
+	void (*free)(void*);
+	void* (*alloc)(RJP_index);
+}RJP_memory_fns;
 
 /***************** NON OBJECT OPERATIONS *******************/
 void* rjp_alloc(RJP_index nbytes);
@@ -127,10 +131,15 @@ RJP_string rjp_escape(const char* src);
 RJP_value* rjp_simple_parse(const char* str);
 RJP_value* rjp_parse(const char* str, int flags, RJP_parse_error* err);
 RJP_value* rjp_parse_cback(int flags, RJP_parse_callback* cbacks, RJP_parse_error* err);
+RJP_value* rjp_parse_c(const char* str, int flags, RJP_parse_error* err, const RJP_memory_fns* fns);
+RJP_value* rjp_parse_cback_c(int flags, RJP_parse_callback* cbacks, RJP_parse_error* err, const RJP_memory_fns* fns);
 char* rjp_to_json(const RJP_value* root, int pretty);
+char* rjp_to_json_c(const RJP_value* root, int pretty, const RJP_memory_fns* fns);
 
 char* rjp_parse_error_to_string(const RJP_parse_error* err);
+char* rjp_parse_error_to_string_c(const RJP_parse_error* err, const RJP_memory_fns* fns);
 void rjp_delete_parse_error(RJP_parse_error* err);
+void rjp_delete_parse_error_c(RJP_parse_error* err, const RJP_memory_fns* fns);
 
 RJP_value* rjp_new_null(void);
 RJP_value* rjp_new_int(RJP_int val);
@@ -142,9 +151,21 @@ RJP_value* rjp_new_object(void);
 RJP_value* rjp_new_ordered_object(void);
 RJP_value* rjp_new_array(void);
 
+RJP_value* rjp_new_null_c(const RJP_memory_fns* fns);
+RJP_value* rjp_new_int_c(RJP_int val, const RJP_memory_fns* fns);
+RJP_value* rjp_new_float_c(RJP_float val, const RJP_memory_fns* fns);
+RJP_value* rjp_new_bool_c(RJP_bool val, const RJP_memory_fns* fns);
+RJP_value* rjp_new_string_c(const char* val, RJP_index length, const RJP_memory_fns* fns);
+RJP_value* rjp_new_string_steal_c(char* val, RJP_index length, const RJP_memory_fns* fns);
+RJP_value* rjp_new_object_c(const RJP_memory_fns* fns);
+RJP_value* rjp_new_ordered_object_c(const RJP_memory_fns* fns);
+RJP_value* rjp_new_array_c(const RJP_memory_fns* fns);
+
 void rjp_free_value(RJP_value* root);
+void rjp_free_value_c(RJP_value* root, const RJP_memory_fns* fns);
 
 RJP_value* rjp_copy_value(RJP_value* dest, const RJP_value* src);
+RJP_value* rjp_copy_value_c(RJP_value* dest, const RJP_value* src, const RJP_memory_fns* fns);
 RJP_value* rjp_move_value(RJP_value* dest, RJP_value* src);
 
 RJP_value* rjp_set_null(RJP_value* v);
@@ -157,6 +178,16 @@ RJP_value* rjp_set_object(RJP_value* v);
 RJP_value* rjp_set_ordered_object(RJP_value* v);
 RJP_value* rjp_set_array(RJP_value* v);
 
+RJP_value* rjp_set_null_c(RJP_value* v, const RJP_memory_fns* fns);
+RJP_value* rjp_set_int_c(RJP_value* v, RJP_int val, const RJP_memory_fns* fns);
+RJP_value* rjp_set_float_c(RJP_value* v, RJP_float val, const RJP_memory_fns* fns);
+RJP_value* rjp_set_bool_c(RJP_value* v, RJP_bool val, const RJP_memory_fns* fns);
+RJP_value* rjp_set_string_c(RJP_value* v, const char* val, RJP_index length, const RJP_memory_fns* fns);
+RJP_value* rjp_set_string_steal_c(RJP_value* v, char* val, RJP_index length, const RJP_memory_fns* fns);
+RJP_value* rjp_set_object_c(RJP_value* v, const RJP_memory_fns* fns);
+RJP_value* rjp_set_ordered_object_c(RJP_value* v, const RJP_memory_fns* fns);
+RJP_value* rjp_set_array_c(RJP_value* v, const RJP_memory_fns* fns);
+
 RJP_float rjp_get_float(const RJP_value* value);
 RJP_int rjp_get_int(const RJP_value* value);
 RJP_bool rjp_get_bool(const RJP_value* value);
@@ -174,13 +205,24 @@ RJP_value* rjp_new_member_steal_key(RJP_value* dest, char* key, RJP_index keylen
 RJP_value* rjp_add_member(RJP_value* dest, const char* key, RJP_index keylen, RJP_value* src);
 RJP_value* rjp_add_member_steal_key(RJP_value* dest, char* key, RJP_index keylen, RJP_value* src);
 
+RJP_value* rjp_new_member_c(RJP_value* dest, const char* key, RJP_index keylen, const RJP_memory_fns* fns);
+RJP_value* rjp_new_member_steal_key_c(RJP_value* dest, char* key, RJP_index keylen, const RJP_memory_fns* fns);
+RJP_value* rjp_add_member_c(RJP_value* dest, const char* key, RJP_index keylen, RJP_value* src, const RJP_memory_fns* fns);
+RJP_value* rjp_add_member_steal_key_c(RJP_value* dest, char* key, RJP_index keylen, RJP_value* src, const RJP_memory_fns* fns);
+
 RJP_value* rjp_remove_member_by_key(RJP_value* obj, const char* key);
 RJP_value* rjp_remove_member(RJP_value* obj, RJP_value* member);
 void rjp_free_member_by_key(RJP_value* obj, const char* key);
 void rjp_free_member(RJP_value* obj, RJP_value* member);
+RJP_value* rjp_remove_member_by_key_c(RJP_value* obj, const char* key, const RJP_memory_fns* fns);
+RJP_value* rjp_remove_member_c(RJP_value* obj, RJP_value* member, const RJP_memory_fns* fns);
+void rjp_free_member_by_key_c(RJP_value* obj, const char* key, const RJP_memory_fns* fns);
+void rjp_free_member_c(RJP_value* obj, RJP_value* member, const RJP_memory_fns* fns);
 
 RJP_value* rjp_set_key_steal(RJP_value* dest, char* key, RJP_index keylen);
 RJP_value* rjp_set_key(RJP_value* dest, const char* key, RJP_index keylen);
+RJP_value* rjp_set_key_steal_c(RJP_value* dest, char* key, RJP_index keylen, const RJP_memory_fns* fns);
+RJP_value* rjp_set_key_c(RJP_value* dest, const char* key, RJP_index keylen, const RJP_memory_fns* fns);
 
 RJP_index rjp_num_members(const RJP_value* object);
 const RJP_string* rjp_member_key(const RJP_value* member);
@@ -188,6 +230,8 @@ RJP_value* rjp_search_member(const RJP_value* object, const char* search);
 
 RJP_value* rjp_object_to_ordered(RJP_value* object);
 RJP_value* rjp_object_to_unordered(RJP_value* object);
+RJP_value* rjp_object_to_ordered_c(RJP_value* object, const RJP_memory_fns* fns);
+RJP_value* rjp_object_to_unordered_c(RJP_value* object, const RJP_memory_fns* fns);
 
 /***************** OBJECT ITERATOR OPERATIONS *******************/
 void rjp_init_object_iterator(RJP_object_iterator* iter, const RJP_value* object);
@@ -199,8 +243,11 @@ RJP_value* rjp_object_iterator_peek(const RJP_object_iterator* it);
 /***************** ARRAY OPERATIONS *******************/
 RJP_value* rjp_new_element(RJP_value* dest);
 RJP_value* rjp_add_element(RJP_value* dest, RJP_value* src);
+RJP_value* rjp_new_element_c(RJP_value* dest, const RJP_memory_fns* fns);
+RJP_value* rjp_add_element_c(RJP_value* dest, RJP_value* src, const RJP_memory_fns* fns);
 RJP_value* rjp_remove_element(RJP_value* arr, RJP_value* elem);
 void rjp_free_element(RJP_value* arr, RJP_value* elem);
+void rjp_free_element_c(RJP_value* arr, RJP_value* elem, const RJP_memory_fns* fns);
 
 RJP_index rjp_num_elements(const RJP_value* arr);
 
diff --git a/include/rjp_array.h b/include/rjp_array.h
index 19e7485..07f8edc 100644
--- a/include/rjp_array.h
+++ b/include/rjp_array.h
@@ -30,8 +30,8 @@ typedef struct RJP_array{
 	RJP_index num_elements;
 }RJP_array;
 
-void irjp_add_element(RJP_array* j);
-void irjp_copy_array(RJP_value* dest, const RJP_value* src);
+void irjp_add_element(RJP_array* j, const RJP_memory_fns* fns);
+void irjp_copy_array(RJP_value* dest, const RJP_value* src, const RJP_memory_fns* fns);
 
 RJP_index irjp_dump_array(const RJP_value* arr, char* dest, const int flags, int depth);
 
diff --git a/include/rjp_internal.h b/include/rjp_internal.h
index f0ea9ba..d0ba5bb 100644
--- a/include/rjp_internal.h
+++ b/include/rjp_internal.h
@@ -41,4 +41,6 @@ static inline void irjp_ignore_unused(FILE* fp, ...){
 }
 #endif
 
+extern const RJP_memory_fns irjp_default_memory_fns;
+
 #endif
diff --git a/include/rjp_object.h b/include/rjp_object.h
index dd003ab..1eeabd5 100644
--- a/include/rjp_object.h
+++ b/include/rjp_object.h
@@ -23,8 +23,8 @@
 #include "rjp_ordered_object.h"
 #include "rjp_internal.h"
 
-void irjp_copy_object(RJP_value* dest, const RJP_value* src);
-void irjp_delete_object(RJP_value* obj);
+void irjp_copy_object(RJP_value* dest, const RJP_value* src, const RJP_memory_fns* fns);
+void irjp_delete_object(RJP_value* obj, const RJP_memory_fns* fns);
 
 RJP_index irjp_dump_object(const RJP_value* root, char* dest, const int flags, int depth);
 
diff --git a/include/rjp_ordered_object.h b/include/rjp_ordered_object.h
index 2792233..d7bd854 100644
--- a/include/rjp_ordered_object.h
+++ b/include/rjp_ordered_object.h
@@ -29,14 +29,12 @@ typedef struct RJP_ordered_object{
 	RJP_index num_members;
 }RJP_ordered_object;
 
-void irjp_copy_ordered_object(RJP_value* dest, const RJP_value* src);
-void irjp_delete_ordered_object(RJP_value* obj);
+void irjp_copy_ordered_object(RJP_value* dest, const RJP_value* src, const RJP_memory_fns* fns);
+void irjp_delete_ordered_object(RJP_value* obj, const RJP_memory_fns* fns);
 
-void irjp_copy_ordered_object(RJP_value* dest, const RJP_value* src);
-void irjp_delete_ordered_object(RJP_value* obj);
-RJP_value* irjp_add_ordered_member(RJP_value* dest, char* key, RJP_index keylen);
-RJP_value* irjp_remove_ordered_member(RJP_value* obj, RJP_value* member);
-void irjp_ordered_set_key(RJP_value* dest, char* key, RJP_index keylen);
+RJP_value* irjp_add_ordered_member(RJP_value* dest, char* key, RJP_index keylen, const RJP_memory_fns* fns);
+RJP_value* irjp_remove_ordered_member(RJP_value* obj, RJP_value* member, const RJP_memory_fns* fns);
+void irjp_ordered_set_key(RJP_value* dest, char* key, RJP_index keylen, const RJP_memory_fns* fns);
 RJP_index irjp_ordered_num_members(const RJP_value* object);
 RJP_value* irjp_ordered_search_member(const RJP_value* object, const char* search);
 void irjp_init_ordered_object_iterator(RJP_object_iterator* it, const RJP_value* object);
diff --git a/include/rjp_string.h b/include/rjp_string.h
index faae5e9..e5a2b71 100644
--- a/include/rjp_string.h
+++ b/include/rjp_string.h
@@ -20,15 +20,16 @@
 #define RJP_STRINGS_H
 
 #include "rjp.h"
+#include "rjp_internal.h"
 
 int irjp_is_whitespace(char c);
 int irjp_copy_string_quoted(char* restrict dest, const char* restrict string, RJP_index length);
 int irjp_copy_string_keyed(char* restrict dest, const char* restrict string, RJP_index length);
-char* irjp_convert_string(const char* str, RJP_index length, RJP_index* newlen);
+char* irjp_convert_string(const char* str, RJP_index length, RJP_index* newlen, const RJP_memory_fns* fns);
 RJP_index irjp_array_strlen(const RJP_value* arr, const int flags, int depth);
 RJP_index irjp_object_strlen(const RJP_value* root, const int flags, int depth);
 RJP_index irjp_value_strlen(const RJP_value* root, const int flags, int depth);
-void irjp_strcpy(RJP_string* dest, const RJP_string* src);
+void irjp_strcpy(RJP_string* dest, const RJP_string* src, const RJP_memory_fns* fns);
 
 #endif
 
diff --git a/include/rjp_unordered_object.h b/include/rjp_unordered_object.h
index d6d99b0..5d1c403 100644
--- a/include/rjp_unordered_object.h
+++ b/include/rjp_unordered_object.h
@@ -29,11 +29,11 @@ typedef struct RJP_unordered_object{
 	RJP_index num_members;
 }RJP_unordered_object;
 
-void irjp_copy_unordered_object(RJP_value* dest, const RJP_value* src);
-void irjp_delete_unordered_object(RJP_value* obj);
-RJP_value* irjp_add_unordered_member(RJP_value* dest, char* key, RJP_index keylen);
-RJP_value* irjp_remove_unordered_member(RJP_value* obj, RJP_value* member);
-void irjp_unordered_set_key(RJP_value* dest, char* key, RJP_index keylen);
+void irjp_copy_unordered_object(RJP_value* dest, const RJP_value* src, const RJP_memory_fns* fns);
+void irjp_delete_unordered_object(RJP_value* obj, const RJP_memory_fns* fns);
+RJP_value* irjp_add_unordered_member(RJP_value* dest, char* key, RJP_index keylen, const RJP_memory_fns* fns);
+RJP_value* irjp_remove_unordered_member(RJP_value* obj, RJP_value* member, const RJP_memory_fns* fns);
+void irjp_unordered_set_key(RJP_value* dest, char* key, RJP_index keylen, const RJP_memory_fns* fns);
 RJP_index irjp_unordered_num_members(const RJP_value* object);
 RJP_value* irjp_unordered_search_member(const RJP_value* object, const char* search);
 void irjp_init_unordered_object_iterator(RJP_object_iterator* it, const RJP_value* object);
diff --git a/include/rjp_value.h b/include/rjp_value.h
index 5896947..5e69fff 100644
--- a/include/rjp_value.h
+++ b/include/rjp_value.h
@@ -40,6 +40,6 @@ typedef struct RJP_value{
 	enum RJP_data_type type; //flag to determine active member of union
 }RJP_value;
 
-void irjp_delete_value(RJP_value* root);
+void irjp_delete_value(RJP_value* root, const RJP_memory_fns* fns);
 
 #endif
diff --git a/include/tree.h b/include/tree.h
index 38e2c88..b825b66 100644
--- a/include/tree.h
+++ b/include/tree.h
@@ -37,12 +37,12 @@ struct RJP_tree_node{
 	unsigned color:1;
 };
 
-RJP_tree_node* irjp_new_node(char* key, RJP_index keylen);
-RJP_tree_node* irjp_tree_insert_value(RJP_tree_node* root, char* key, RJP_index keylen, RJP_value** added, int* status);
+RJP_tree_node* irjp_new_node(char* key, RJP_index keylen, const RJP_memory_fns* fns);
+RJP_tree_node* irjp_tree_insert_value(RJP_tree_node* root, char* key, RJP_index keylen, RJP_value** added, int* status, const RJP_memory_fns* fns);
 RJP_tree_node* irjp_tree_insert_node(RJP_tree_node *restrict root, RJP_tree_node *restrict newnode);
 RJP_tree_node* irjp_tree_remove_value(RJP_tree_node* restrict root, RJP_tree_node* restrict member, RJP_tree_node** removed_node);
 RJP_tree_node* irjp_tree_search_value(RJP_tree_node* root, const char* key);
-RJP_tree_node* irjp_copy_tree(const RJP_tree_node* root);
-void irjp_free_tree(RJP_tree_node* root);
+RJP_tree_node* irjp_copy_tree(const RJP_tree_node* root, const RJP_memory_fns* fns);
+void irjp_free_tree(RJP_tree_node* root, const RJP_memory_fns* fns);
 
 #endif
diff --git a/src/output.c b/src/output.c
index a115f20..d817c27 100644
--- a/src/output.c
+++ b/src/output.c
@@ -30,123 +30,187 @@
 #include <stdio.h> //sprintf
 
 RJP_value* rjp_new_null(void){
-	RJP_value* ret = rjp_calloc(1, sizeof(RJP_value));
+	return rjp_new_null_c(&irjp_default_memory_fns);
+}
+RJP_value* rjp_new_int(RJP_int val){
+	return rjp_new_int_c(val, &irjp_default_memory_fns);
+}
+RJP_value* rjp_new_float(RJP_float val){
+	return rjp_new_float_c(val, &irjp_default_memory_fns);
+}
+RJP_value* rjp_new_bool(RJP_bool val){
+	return rjp_new_bool_c(val, &irjp_default_memory_fns);
+}
+RJP_value* rjp_new_string_steal(char* val, RJP_index length){
+	return rjp_new_string_steal_c(val, length, &irjp_default_memory_fns);
+}
+RJP_value* rjp_new_string(const char* value, RJP_index length){
+	return rjp_new_string_c(value, length, &irjp_default_memory_fns);
+}
+RJP_value* rjp_new_object(void){
+	return rjp_new_object_c(&irjp_default_memory_fns);
+}
+RJP_value* rjp_new_ordered_object(void){
+	return rjp_new_ordered_object_c(&irjp_default_memory_fns);
+}
+RJP_value* rjp_new_array(void){
+	return rjp_new_array_c(&irjp_default_memory_fns);
+}
+
+RJP_value* rjp_new_null_c(const RJP_memory_fns* fns){
+	RJP_value* ret = fns->alloc(sizeof(RJP_value));
+	memset(ret, 0, sizeof(RJP_value));
 	ret->type = rjp_json_null;
 	return ret;
 }
-RJP_value* rjp_new_int(RJP_int val){
-	RJP_value* ret = rjp_calloc(1, sizeof(RJP_value));
+RJP_value* rjp_new_int_c(RJP_int val, const RJP_memory_fns* fns){
+	RJP_value* ret = fns->alloc(sizeof(RJP_value));
+	memset(ret, 0, sizeof(RJP_value));
 	ret->type = rjp_json_integer;
 	ret->integer = val;
 	return ret;
 }
-RJP_value* rjp_new_float(RJP_float val){
-	RJP_value* ret = rjp_calloc(1, sizeof(RJP_value));
+RJP_value* rjp_new_float_c(RJP_float val, const RJP_memory_fns* fns){
+	RJP_value* ret = fns->alloc(sizeof(RJP_value));
+	memset(ret, 0, sizeof(RJP_value));
 	ret->type = rjp_json_dfloat;
 	ret->dfloat = val;
 	return ret;
 }
-RJP_value* rjp_new_bool(RJP_bool val){
-	RJP_value* ret = rjp_calloc(1, sizeof(RJP_value));
+RJP_value* rjp_new_bool_c(RJP_bool val, const RJP_memory_fns* fns){
+	RJP_value* ret = fns->alloc(sizeof(RJP_value));
+	memset(ret, 0, sizeof(RJP_value));
 	ret->type = rjp_json_boolean;
 	ret->boolean = val;
 	return ret;
 }
-RJP_value* rjp_new_string_steal(char* val, RJP_index length){
-	RJP_value* ret = rjp_calloc(1, sizeof(RJP_value));
+RJP_value* rjp_new_string_steal_c(char* val, RJP_index length, const RJP_memory_fns* fns){
+	RJP_value* ret = fns->alloc(sizeof(RJP_value));
+	memset(ret, 0, sizeof(RJP_value));
 	ret->type = rjp_json_string;
 	ret->string.value = val;
 	ret->string.length = length;
 	return ret;
 }
-RJP_value* rjp_new_string(const char* value, RJP_index length){
+RJP_value* rjp_new_string_c(const char* value, RJP_index length, const RJP_memory_fns* fns){
 	UNUSED_VARIABLE(length);
-	RJP_value* ret = rjp_calloc(1, sizeof(RJP_value));
+	RJP_value* ret = fns->alloc(sizeof(RJP_value));
+	memset(ret, 0, sizeof(RJP_value));
 	ret->type = rjp_json_string;
 	RJP_index esclen = rjp_escape_strlen(value);
-	ret->string.value = rjp_alloc(esclen+1);
+	ret->string.value = fns->alloc(esclen+1);
 	rjp_escape_strcpy(ret->string.value, value);
 	ret->string.value[esclen] = 0;
 	ret->string.length = esclen;
 	return ret;
 }
-RJP_value* rjp_new_object(void){
-	RJP_value* ret = rjp_calloc(1, sizeof(RJP_value));
+RJP_value* rjp_new_object_c(const RJP_memory_fns* fns){
+	RJP_value* ret = fns->alloc(sizeof(RJP_value));
+	memset(ret, 0, sizeof(RJP_value));
 	ret->type = rjp_json_object;
 	return ret;
 }
-RJP_value* rjp_new_ordered_object(void){
-	RJP_value* ret = rjp_calloc(1, sizeof(RJP_value));
+RJP_value* rjp_new_ordered_object_c(const RJP_memory_fns* fns){
+	RJP_value* ret = fns->alloc(sizeof(RJP_value));
+	memset(ret, 0, sizeof(RJP_value));
 	ret->type = rjp_json_ordered_object;
 	return ret;
 }
-RJP_value* rjp_new_array(void){
-	RJP_value* ret = rjp_calloc(1, sizeof(RJP_value));
+RJP_value* rjp_new_array_c(const RJP_memory_fns* fns){
+	RJP_value* ret = fns->alloc(sizeof(RJP_value));
+	memset(ret, 0, sizeof(RJP_value));
 	ret->type = rjp_json_array;
 	return ret;
 }
 
 RJP_value* rjp_set_null(RJP_value* v){
-	irjp_delete_value(v);
+	return rjp_set_null_c(v, &irjp_default_memory_fns);
+}
+RJP_value* rjp_set_int(RJP_value* v, RJP_int val){
+	return rjp_set_int_c(v, val, &irjp_default_memory_fns);
+}
+RJP_value* rjp_set_float(RJP_value* v, RJP_float val){
+	return rjp_set_float_c(v, val, &irjp_default_memory_fns);
+}
+RJP_value* rjp_set_bool(RJP_value* v, RJP_bool val){
+	return rjp_set_bool_c(v, val, &irjp_default_memory_fns);
+}
+RJP_value* rjp_set_string_steal(RJP_value* v, char* val, RJP_index len){
+	return rjp_set_string_steal_c(v, val, len, &irjp_default_memory_fns);
+}
+RJP_value* rjp_set_string(RJP_value* v, const char* val, RJP_index length){
+	return rjp_set_string_c(v, val, length, &irjp_default_memory_fns);
+}
+RJP_value* rjp_set_object(RJP_value* v){
+	return rjp_set_object_c(v, &irjp_default_memory_fns);
+}
+RJP_value* rjp_set_ordered_object(RJP_value* v){
+	return rjp_set_ordered_object_c(v, &irjp_default_memory_fns);
+}
+RJP_value* rjp_set_array(RJP_value* v){
+	return rjp_set_array_c(v, &irjp_default_memory_fns);
+}
+RJP_value* rjp_set_null_c(RJP_value* v, const RJP_memory_fns* fns){
+	irjp_delete_value(v, fns);
 	v->type = rjp_json_null;
 	return v;
 }
-RJP_value* rjp_set_int(RJP_value* v, RJP_int val){
-	irjp_delete_value(v);
+RJP_value* rjp_set_int_c(RJP_value* v, RJP_int val, const RJP_memory_fns* fns){
+	irjp_delete_value(v, fns);
 	v->type = rjp_json_integer;
 	v->integer = val;
 	return v;
 }
-RJP_value* rjp_set_float(RJP_value* v, RJP_float val){
-	irjp_delete_value(v);
+RJP_value* rjp_set_float_c(RJP_value* v, RJP_float val, const RJP_memory_fns* fns){
+	irjp_delete_value(v, fns);
 	v->type = rjp_json_dfloat;
 	v->dfloat = val;
 	return v;
 }
-RJP_value* rjp_set_bool(RJP_value* v, RJP_bool val){
-	irjp_delete_value(v);
+RJP_value* rjp_set_bool_c(RJP_value* v, RJP_bool val, const RJP_memory_fns* fns){
+	irjp_delete_value(v, fns);
 	v->type = rjp_json_boolean;
 	v->boolean = val;
 	return v;
 }
-RJP_value* rjp_set_string_steal(RJP_value* v, char* val, RJP_index len){
-	irjp_delete_value(v);
+RJP_value* rjp_set_string_steal_c(RJP_value* v, char* val, RJP_index len, const RJP_memory_fns* fns){
+	irjp_delete_value(v, fns);
 	v->type = rjp_json_string;
 	v->string.value = val;
 	v->string.length = len;
 	return v;
 }
-RJP_value* rjp_set_string(RJP_value* v, const char* val, RJP_index length){
+RJP_value* rjp_set_string_c(RJP_value* v, const char* val, RJP_index length, const RJP_memory_fns* fns){
 	UNUSED_VARIABLE(length);
-	irjp_delete_value(v);
+	irjp_delete_value(v, fns);
 	v->type = rjp_json_string;
 	RJP_index esclen = rjp_escape_strlen(val);
-	v->string.value = rjp_alloc(esclen+1);
+	v->string.value = fns->alloc(esclen+1);
 	rjp_escape_strcpy(v->string.value, val);
 	v->string.value[esclen] = 0;
 	v->string.length = esclen;
 	return v;
 }
-RJP_value* rjp_set_object(RJP_value* v){
+RJP_value* rjp_set_object_c(RJP_value* v, const RJP_memory_fns* fns){
 	if(v->type == rjp_json_object)
 		return v;
-	irjp_delete_value(v);
+	irjp_delete_value(v, fns);
 	memset(&v->object, 0, sizeof(RJP_unordered_object));
 	v->type = rjp_json_object;
 	return v;
 }
-RJP_value* rjp_set_ordered_object(RJP_value* v){
+RJP_value* rjp_set_ordered_object_c(RJP_value* v, const RJP_memory_fns* fns){
 	if(v->type == rjp_json_ordered_object)
 		return v;
-	irjp_delete_value(v);
+	irjp_delete_value(v, fns);
 	memset(&v->orobject, 0, sizeof(RJP_ordered_object));
 	v->type = rjp_json_ordered_object;
 	return v;
 }
-RJP_value* rjp_set_array(RJP_value* v){
+RJP_value* rjp_set_array_c(RJP_value* v, const RJP_memory_fns* fns){
 	if(v->type == rjp_json_array)
 		return v;
-	irjp_delete_value(v);
+	irjp_delete_value(v, fns);
 	memset(&v->array, 0, sizeof(RJP_array));
 	v->type = rjp_json_array;
 	return v;
@@ -279,12 +343,15 @@ RJP_index irjp_dump_object(const RJP_value* root, char* dest, const int flags, i
 }
 
 char* rjp_to_json(const RJP_value* root, const int flags){
+	return rjp_to_json_c(root, flags, &irjp_default_memory_fns);
+}
+char* rjp_to_json_c(const RJP_value* root, const int flags, const RJP_memory_fns* fns){
 	if(!root)
 		return NULL;
 	RJP_index len = irjp_value_strlen(root, flags, 0);
 	if(!len)
 		return NULL;
-	char* tmp = rjp_alloc(len + 1);
+	char* tmp = fns->alloc(len + 1);
 	tmp[len] = 0;
 
 	irjp_write_value(tmp, root, flags, 0);
diff --git a/src/rjp.c b/src/rjp.c
index 9cd4780..a73e048 100644
--- a/src/rjp.c
+++ b/src/rjp.c
@@ -34,28 +34,33 @@ void rjp_free(void* data){
 	free(data);
 }
 
+const RJP_memory_fns irjp_default_memory_fns = {rjp_free, rjp_alloc};
+
 RJP_value* rjp_copy_value(RJP_value* dest, const RJP_value* src){
+	return rjp_copy_value_c(dest, src, &irjp_default_memory_fns);
+}
+RJP_value* rjp_copy_value_c(RJP_value* dest, const RJP_value* src, const RJP_memory_fns* fns){
 	RJP_value* ret;
 	if(dest){
-		irjp_delete_value(dest);
+		irjp_delete_value(dest, fns);
 		ret = dest;
 	}else{
-		ret = rjp_new_null();
+		ret = rjp_new_null_c(fns);
 	}
 	ret->type = src->type;
 
 	switch(src->type){
 	case rjp_json_object:
-		irjp_copy_object(ret, src);
+		irjp_copy_object(ret, src, fns);
 		break;
 	case rjp_json_ordered_object:
-		irjp_copy_ordered_object(ret, src);
+		irjp_copy_ordered_object(ret, src, fns);
 		break;
 	case rjp_json_array:
-		irjp_copy_array(ret, src);
+		irjp_copy_array(ret, src, fns);
 		break;
 	case rjp_json_string:
-		irjp_strcpy(&ret->string, &src->string);
+		irjp_strcpy(&ret->string, &src->string, fns);
 		break;
 	case rjp_json_integer:
 		ret->integer = src->integer;
@@ -77,37 +82,40 @@ RJP_value* rjp_move_value(RJP_value* dest, RJP_value* src){
 	return dest;
 }
 
-static void irjp_delete_array(RJP_value* root){
+static void irjp_delete_array(RJP_value* root, const RJP_memory_fns* fns){
 	RJP_array_iterator it;
 	rjp_init_array_iterator(&it, root);
 	RJP_value* next = rjp_array_iterator_current(&it);
 
 	for(RJP_value* current = next;current;current = next){
 		next = rjp_array_iterator_next(&it);
-		rjp_free_value(current);
+		rjp_free_value_c(current, fns);
 	}
 }
 
-void irjp_delete_value(RJP_value* root){
+void irjp_delete_value(RJP_value* root, const RJP_memory_fns* fns){
 	switch(root->type){
 	case rjp_json_object:
 	case rjp_json_ordered_object:
-		irjp_delete_object(root);
+		irjp_delete_object(root, fns);
 		break;
 	case rjp_json_array:
-		irjp_delete_array(root);
+		irjp_delete_array(root, fns);
 		break;
 	case rjp_json_string:
-		rjp_free(root->string.value);
+		fns->free(root->string.value);
 		break;
 	default: break;
 	};
 }
 void rjp_free_value(RJP_value* root){
+	rjp_free_value_c(root, &irjp_default_memory_fns);
+}
+void rjp_free_value_c(RJP_value* root, const RJP_memory_fns* fns){
 	if(!root)
 		return;
-	irjp_delete_value(root);
-	rjp_free(root);
+	irjp_delete_value(root, fns);
+	fns->free(root);
 }
 
 /* VALUE SETTING */
diff --git a/src/rjp_array.c b/src/rjp_array.c
index e9f39d0..f5d52fa 100644
--- a/src/rjp_array.c
+++ b/src/rjp_array.c
@@ -17,42 +17,51 @@
 */
 
 #include <stddef.h>
+#include <string.h> //memset
 
 #include "rjp_internal.h"
 #include "rjp_array.h"
 #include "rjp_value.h"
 #include "rjp_array_element.h"
 
-void irjp_copy_array(RJP_value* dest, const RJP_value* src){
+void irjp_copy_array(RJP_value* dest, const RJP_value* src, const RJP_memory_fns* fns){
 	dest->array.elements = dest->array.last = NULL;
 	for(RJP_array_element* curr = src->array.elements;curr;curr = curr->next){
 		RJP_value* copy_mem;
-		copy_mem = rjp_new_element(dest);
-		rjp_copy_value(copy_mem, &curr->value);
+		copy_mem = rjp_new_element_c(dest, fns);
+		rjp_copy_value_c(copy_mem, &curr->value, fns);
 	}
 }
-void irjp_add_element(RJP_array* j){
+void irjp_add_element(RJP_array* j, const RJP_memory_fns* fns){
 	++j->num_elements;
 	if(!j->elements){
-		j->elements = rjp_calloc(1, sizeof(RJP_array_element));
+		j->elements = fns->alloc(sizeof(RJP_array_element));
+		memset(j->elements, 0, sizeof(RJP_array_element));
 		j->last = j->elements;
 	}else{
-		j->last->next = rjp_calloc(1, sizeof(RJP_array_element));
+		j->last->next = fns->alloc(sizeof(RJP_array_element));
+		memset(j->last->next, 0, sizeof(RJP_array_element));
 		j->last = j->last->next;
 		j->last->prev = j->last;
 	}
 }
 RJP_value* rjp_new_element(RJP_value* dest){
-	irjp_add_element(&dest->array);
+	return rjp_new_element_c(dest, &irjp_default_memory_fns);
+}
+RJP_value* rjp_new_element_c(RJP_value* dest, const RJP_memory_fns* fns){
+	irjp_add_element(&dest->array, fns);
 	dest->array.last->value.parent = dest;
 	return &dest->array.last->value;
 }
 RJP_value* rjp_add_element(RJP_value* dest, RJP_value* src){
-	RJP_value* newelm = rjp_new_element(dest);
+	return rjp_add_element_c(dest, src, &irjp_default_memory_fns);
+}
+RJP_value* rjp_add_element_c(RJP_value* dest, RJP_value* src, const RJP_memory_fns* fns){
+	RJP_value* newelm = rjp_new_element_c(dest, fns);
 	if(!newelm)
 		return NULL;
 	rjp_move_value(newelm, src);
-	rjp_free(src);
+	fns->free(src);
 	return newelm;
 }
 RJP_value* rjp_remove_element(RJP_value* dest, RJP_value* value){
@@ -75,8 +84,11 @@ RJP_value* rjp_remove_element(RJP_value* dest, RJP_value* value){
 	return value;
 }
 void rjp_free_element(RJP_value* dest, RJP_value* value){
+	rjp_free_element_c(dest, value, &irjp_default_memory_fns);
+}
+void rjp_free_element_c(RJP_value* dest, RJP_value* value, const RJP_memory_fns* fns){
 	rjp_remove_element(dest, value);
-	rjp_free_value(value);
+	rjp_free_value_c(value, fns);
 }
 RJP_index rjp_num_elements(const RJP_value* array){
 	return array->array.num_elements;
diff --git a/src/rjp_object.c b/src/rjp_object.c
index 2d14259..4edc84f 100644
--- a/src/rjp_object.c
+++ b/src/rjp_object.c
@@ -25,29 +25,32 @@
 
 #include <string.h> //strlen, strncpy
 
-void irjp_copy_object(RJP_value* dest, const RJP_value* src){
+void irjp_copy_object(RJP_value* dest, const RJP_value* src, const RJP_memory_fns* fns){
 	switch(src->type){
 	case rjp_json_object:
-		irjp_copy_unordered_object(dest, src);
+		irjp_copy_unordered_object(dest, src, fns);
 		break;
 	case rjp_json_ordered_object:
-		irjp_copy_ordered_object(dest, src);
+		irjp_copy_ordered_object(dest, src, fns);
 		break;
 	default: break;
 	};
 }
-void irjp_delete_object(RJP_value* obj){
+void irjp_delete_object(RJP_value* obj, const RJP_memory_fns* fns){
 	switch(obj->type){
 	case rjp_json_object:
-		irjp_delete_unordered_object(obj);
+		irjp_delete_unordered_object(obj, fns);
 		break;
 	case rjp_json_ordered_object:
-		irjp_delete_ordered_object(obj);
+		irjp_delete_ordered_object(obj, fns);
 		break;
 	default: break;
 	};
 }
 RJP_value* rjp_new_member_steal_key(RJP_value* dest, char* key, RJP_index keylen){
+	return rjp_new_member_steal_key_c(dest, key, keylen, &irjp_default_memory_fns);
+}
+RJP_value* rjp_new_member_steal_key_c(RJP_value* dest, char* key, RJP_index keylen, const RJP_memory_fns* fns){
 	if(!key)
 		return NULL;
 	if(!keylen)
@@ -55,78 +58,105 @@ RJP_value* rjp_new_member_steal_key(RJP_value* dest, char* key, RJP_index keylen
 			return NULL;
 	switch(dest->type){
 	case rjp_json_object:
-		return irjp_add_unordered_member(dest, key, keylen);
+		return irjp_add_unordered_member(dest, key, keylen, fns);
 	case rjp_json_ordered_object:
-		return irjp_add_ordered_member(dest, key, keylen);
+		return irjp_add_ordered_member(dest, key, keylen, fns);
 	default: break;
 	};
 	return NULL;
 }
 RJP_value* rjp_new_member(RJP_value* dest, const char* key, RJP_index keylen){
+	return rjp_new_member_c(dest, key, keylen, &irjp_default_memory_fns);
+}
+RJP_value* rjp_new_member_c(RJP_value* dest, const char* key, RJP_index keylen, const RJP_memory_fns* fns){
 	if(!key)
 		return NULL;
 	if(!keylen)
 		if(!(keylen = rjp_escape_strlen(key)))
 			return NULL;
-	char* newkey = rjp_alloc(keylen+1);
+	char* newkey = fns->alloc(keylen+1);
 	rjp_escape_strcpy(newkey, key);
 	newkey[keylen] = 0;
-	return rjp_new_member_steal_key(dest, newkey, keylen);
+	return rjp_new_member_steal_key_c(dest, newkey, keylen, fns);
 }
 RJP_value* rjp_add_member_steal_key(RJP_value* dest, char* key, RJP_index keylen, RJP_value* src){
-	RJP_value* newval = rjp_new_member_steal_key(dest, key, keylen);
+	return rjp_add_member_steal_key_c(dest, key, keylen, src, &irjp_default_memory_fns);
+}
+RJP_value* rjp_add_member_steal_key_c(RJP_value* dest, char* key, RJP_index keylen, RJP_value* src, const RJP_memory_fns* fns){
+	RJP_value* newval = rjp_new_member_steal_key_c(dest, key, keylen, fns);
 	if(!newval)
 		return NULL;
 	rjp_move_value(newval, src);
-	rjp_free(src);
+	fns->free(src);
 	return newval;
 }
 RJP_value* rjp_add_member(RJP_value* dest, const char* key, RJP_index keylen, RJP_value* src){
-	RJP_value* newval = rjp_new_member(dest, key, keylen);
+	return rjp_add_member_c(dest, key, keylen, src, &irjp_default_memory_fns);
+}
+RJP_value* rjp_add_member_c(RJP_value* dest, const char* key, RJP_index keylen, RJP_value* src, const RJP_memory_fns* fns){
+	RJP_value* newval = rjp_new_member_c(dest, key, keylen, fns);
 	if(!newval)
 		return NULL;
 	rjp_move_value(newval, src);
-	rjp_free(src);
+	fns->free(src);
 	return newval;
 }
 RJP_value* rjp_remove_member_by_key(RJP_value* obj, const char* key){
+	return rjp_remove_member_by_key_c(obj, key, &irjp_default_memory_fns);
+}
+RJP_value* rjp_remove_member_by_key_c(RJP_value* obj, const char* key, const RJP_memory_fns* fns){
 	RJP_value* member = rjp_search_member(obj, key);
 	if(!member)
 		return NULL;
-	return rjp_remove_member(obj, member);
+	return rjp_remove_member_c(obj, member, fns);
 }
 RJP_value* rjp_remove_member(RJP_value* obj, RJP_value* member){
+	return rjp_remove_member_c(obj, member, &irjp_default_memory_fns);
+}
+RJP_value* rjp_remove_member_c(RJP_value* obj, RJP_value* member, const RJP_memory_fns* fns){
 	if(member->parent != obj)
 		return NULL;
 	switch(obj->type){
 	case rjp_json_object:
-		return irjp_remove_unordered_member(obj, member);
+		return irjp_remove_unordered_member(obj, member, fns);
 	case rjp_json_ordered_object:
-		return irjp_remove_ordered_member(obj, member);
+		return irjp_remove_ordered_member(obj, member, fns);
 	default: break;
 	};
 	return NULL;
 }
 void rjp_free_member_by_key(RJP_value* obj, const char* key){
+	rjp_free_member_by_key_c(obj, key, &irjp_default_memory_fns);
+}
+void rjp_free_member_by_key_c(RJP_value* obj, const char* key, const RJP_memory_fns* fns){
 	RJP_value* removed = rjp_remove_member_by_key(obj, key);
-	rjp_free_value(removed);
+	rjp_free_value_c(removed, fns);
 }
 void rjp_free_member(RJP_value* obj, RJP_value* member){
-	rjp_free_member_by_key(obj, ((RJP_object_member*)member)->name.value);
+	rjp_free_member_c(obj, member, &irjp_default_memory_fns);
+}
+void rjp_free_member_c(RJP_value* obj, RJP_value* member, const RJP_memory_fns* fns){
+	rjp_free_member_by_key_c(obj, ((RJP_object_member*)member)->name.value, fns);
 }
 
 RJP_value* rjp_set_key(RJP_value* dest, const char* key, RJP_index keylen){
+	return rjp_set_key_c(dest, key, keylen, &irjp_default_memory_fns);
+}
+RJP_value* rjp_set_key_c(RJP_value* dest, const char* key, RJP_index keylen, const RJP_memory_fns* fns){
 	if(!key)
 		return NULL;
 	if(!keylen){
 		if(!(keylen = strlen(key)))
 			return NULL;
 	}
-	char* newkey = rjp_alloc(keylen + 1);
+	char* newkey = fns->alloc(keylen + 1);
 	strncpy(newkey, key, keylen+1);
 	return rjp_set_key_steal(dest, newkey, keylen);
 }
 RJP_value* rjp_set_key_steal(RJP_value* dest, char* key, RJP_index keylen){
+	return rjp_set_key_steal_c(dest, key, keylen, &irjp_default_memory_fns);
+}
+RJP_value* rjp_set_key_steal_c(RJP_value* dest, char* key, RJP_index keylen, const RJP_memory_fns* fns){
 	if(!key)
 		return NULL;
 	if(!keylen){
@@ -135,10 +165,10 @@ RJP_value* rjp_set_key_steal(RJP_value* dest, char* key, RJP_index keylen){
 	}
 	switch(dest->parent->type){
 	case rjp_json_object:
-		irjp_unordered_set_key(dest, key, keylen);
+		irjp_unordered_set_key(dest, key, keylen, fns);
 		break;
 	case rjp_json_ordered_object:
-		irjp_ordered_set_key(dest, key, keylen);
+		irjp_ordered_set_key(dest, key, keylen, fns);
 		break;
 	default: break;
 	};
@@ -233,6 +263,9 @@ RJP_value* rjp_object_iterator_peek(const RJP_object_iterator* it){
 }
 
 RJP_value* rjp_object_to_ordered(RJP_value* object){
+	return rjp_object_to_ordered_c(object, &irjp_default_memory_fns);
+}
+RJP_value* rjp_object_to_ordered_c(RJP_value* object, const RJP_memory_fns* fns){
 	if(object->type == rjp_json_ordered_object)
 		return object;
 	RJP_value newobj = {0};
@@ -242,11 +275,11 @@ RJP_value* rjp_object_to_ordered(RJP_value* object){
 	irjp_init_unordered_object_iterator(&it, object);
 	RJP_value* next = irjp_unordered_object_iterator_current(&it);
 	for(RJP_value* current = next;current;current = next){
-		RJP_value* newcur = irjp_add_ordered_member(&newobj, rjp_member_key(current)->value, rjp_member_key(current)->length);
+		RJP_value* newcur = irjp_add_ordered_member(&newobj, rjp_member_key(current)->value, rjp_member_key(current)->length, fns);
 		((RJP_object_member*)current)->name.value = NULL;
 		rjp_move_value(newcur, current);
 		next = irjp_unordered_object_iterator_next(&it);
-		rjp_free(current);
+		fns->free(current);
 	}
 	irjp_delete_unordered_object_iterator(&it);
 
@@ -256,6 +289,9 @@ RJP_value* rjp_object_to_ordered(RJP_value* object){
 	return object;
 }
 RJP_value* rjp_object_to_unordered(RJP_value* object){
+	return rjp_object_to_unordered_c(object, &irjp_default_memory_fns);
+}
+RJP_value* rjp_object_to_unordered_c(RJP_value* object, const RJP_memory_fns* fns){
 	if(object->type == rjp_json_object)
 		return object;
 	RJP_value newobj = {0};
@@ -265,11 +301,11 @@ RJP_value* rjp_object_to_unordered(RJP_value* object){
 	irjp_init_ordered_object_iterator(&it, object);
 	RJP_value* next = irjp_ordered_object_iterator_current(&it);
 	for(RJP_value* current = next;current;current = next){
-		RJP_value* newcur = irjp_add_unordered_member(&newobj, rjp_member_key(current)->value, rjp_member_key(current)->length);
+		RJP_value* newcur = irjp_add_unordered_member(&newobj, rjp_member_key(current)->value, rjp_member_key(current)->length, fns);
 		((RJP_object_member*)current)->name.value = NULL;
 		rjp_move_value(newcur, current);
 		next = irjp_ordered_object_iterator_next(&it);
-		rjp_free(current);
+		fns->free(current);
 	}
 	irjp_delete_ordered_object_iterator(&it);
 
diff --git a/src/rjp_ordered_object.c b/src/rjp_ordered_object.c
index 861db37..bc2754e 100644
--- a/src/rjp_ordered_object.c
+++ b/src/rjp_ordered_object.c
@@ -30,33 +30,33 @@ typedef struct RJP_ordered_member{
 	struct RJP_ordered_member* next;
 }RJP_ordered_member;
 
-static void irjp_copy_ordered_member(RJP_ordered_member* dest, const RJP_ordered_member* src){
-	irjp_strcpy(&dest->member.name, &src->member.name);
-	rjp_copy_value(&dest->member.value, &src->member.value);
+static void irjp_copy_ordered_member(RJP_ordered_member* dest, const RJP_ordered_member* src, const RJP_memory_fns* fns){
+	irjp_strcpy(&dest->member.name, &src->member.name, fns);
+	rjp_copy_value_c(&dest->member.value, &src->member.value, fns);
 }
 
-void irjp_copy_ordered_object(RJP_value* dest, const RJP_value* src){
-	irjp_delete_ordered_object(dest);
+void irjp_copy_ordered_object(RJP_value* dest, const RJP_value* src, const RJP_memory_fns* fns){
+	irjp_delete_ordered_object(dest, fns);
 	dest->orobject.num_members = 0;
 
 	RJP_object_iterator it;
 	irjp_init_ordered_object_iterator(&it, src);
 	for(const RJP_value* current = irjp_ordered_object_iterator_current(&it);current;current = irjp_ordered_object_iterator_next(&it)){
 		RJP_string keycopy;
-		irjp_strcpy(&keycopy, &((RJP_object_member*)current)->name);
-		RJP_ordered_member* newmemb = (RJP_ordered_member*)irjp_add_ordered_member(dest, keycopy.value, keycopy.length);
-		irjp_copy_ordered_member(newmemb, (RJP_ordered_member*)current);
+		irjp_strcpy(&keycopy, &((RJP_object_member*)current)->name, fns);
+		RJP_ordered_member* newmemb = (RJP_ordered_member*)irjp_add_ordered_member(dest, keycopy.value, keycopy.length, fns);
+		irjp_copy_ordered_member(newmemb, (RJP_ordered_member*)current, fns);
 	}
 	irjp_delete_ordered_object_iterator(&it);
 }
-void irjp_delete_ordered_object(RJP_value* obj){
+void irjp_delete_ordered_object(RJP_value* obj, const RJP_memory_fns* fns){
 	RJP_object_iterator it;
 	irjp_init_ordered_object_iterator(&it, obj);
 	RJP_value* next = irjp_ordered_object_iterator_current(&it);
 	for(RJP_value* current = next;current;current = next){
 		next = irjp_ordered_object_iterator_next(&it);
-		rjp_free(((RJP_object_member*)current)->name.value);
-		rjp_free_value(current);
+		fns->free(((RJP_object_member*)current)->name.value);
+		rjp_free_value_c(current, fns);
 	}
 	irjp_delete_ordered_object_iterator(&it);
 }
@@ -73,15 +73,16 @@ static RJP_ordered_member* irjp_append_ordered_member(RJP_ordered_object* dest,
 	dest->last = newmemb;
 	return newmemb;
 }
-RJP_value* irjp_add_ordered_member(RJP_value* dest, char* key, RJP_index keylen){
-	RJP_ordered_member* newmemb = rjp_calloc(1, sizeof(RJP_ordered_member));
+RJP_value* irjp_add_ordered_member(RJP_value* dest, char* key, RJP_index keylen, const RJP_memory_fns* fns){
+	RJP_ordered_member* newmemb = fns->alloc(sizeof(RJP_ordered_member));
+	memset(newmemb, 0, sizeof(RJP_ordered_member));
 	irjp_append_ordered_member((RJP_ordered_object*)dest, newmemb);
-	irjp_ordered_set_key((RJP_value*)newmemb, key, keylen);
+	irjp_ordered_set_key((RJP_value*)newmemb, key, keylen, fns);
 	((RJP_value*)newmemb)->parent = dest;
 	((RJP_value*)newmemb)->type = rjp_json_null;
 	return (RJP_value*)newmemb;
 }
-RJP_value* irjp_remove_ordered_member(RJP_value* obj, RJP_value* member){
+RJP_value* irjp_remove_ordered_member(RJP_value* obj, RJP_value* member, const RJP_memory_fns* fns){
 	RJP_ordered_member* current = (RJP_ordered_member*)member;
 	RJP_ordered_member* prev = current->prev;
 	RJP_ordered_member* next = current->next;
@@ -97,11 +98,12 @@ RJP_value* irjp_remove_ordered_member(RJP_value* obj, RJP_value* member){
 		obj->orobject.last = prev;
 
 	member->parent = NULL;
+	fns->free(((RJP_object_member*)member)->name.value);
 	return member;
 }
-void irjp_ordered_set_key(RJP_value* dest, char* key, RJP_index keylen){
+void irjp_ordered_set_key(RJP_value* dest, char* key, RJP_index keylen, const RJP_memory_fns* fns){
 	RJP_object_member* mem = (RJP_object_member*)dest;
-	rjp_free(mem->name.value);
+	fns->free(mem->name.value);
 	mem->name.value = key;
 	mem->name.length = keylen;
 }
diff --git a/src/rjp_parse.c b/src/rjp_parse.c
index 3fe5a66..ca108ec 100644
--- a/src/rjp_parse.c
+++ b/src/rjp_parse.c
@@ -104,7 +104,7 @@ static void irjp_parse_stack_set(RJP_parse_stack* s, RJP_parse_target target){
 	s->stack[s->position] = target;
 }
 
-static int irjp_init_value(RJP_value* newval, RJP_lex_category cat, RJP_parse_state* state){
+static int irjp_init_value(RJP_value* newval, RJP_lex_category cat, RJP_parse_state* state, const RJP_memory_fns* fns){
 	RJP_index length = state->lexstate.length;
 	RJP_index offset = state->lexstate.offset;
 	const char* str = state->lexstate.str + offset;
@@ -112,7 +112,7 @@ static int irjp_init_value(RJP_value* newval, RJP_lex_category cat, RJP_parse_st
 	case rjp_lex_string:;
 		RJP_index newlength;
 		newval->type = rjp_json_string;
-		newval->string.value = irjp_convert_string(str, length, &newlength);
+		newval->string.value = irjp_convert_string(str, length, &newlength, fns);
 		if(!newval->string.value)
 			return 1;
 		newval->string.length = newlength;
@@ -152,20 +152,20 @@ static int irjp_init_value(RJP_value* newval, RJP_lex_category cat, RJP_parse_st
 	};
 	return 0;
 }
-static RJP_value* irjp_add_value_to_array(RJP_lex_category cat, RJP_parse_state* state){
-	state->lastadded = rjp_new_element(state->curr);
-	if(irjp_init_value(state->lastadded, cat, state))
+static RJP_value* irjp_add_value_to_array(RJP_lex_category cat, RJP_parse_state* state, const RJP_memory_fns* fns){
+	state->lastadded = rjp_new_element_c(state->curr, fns);
+	if(irjp_init_value(state->lastadded, cat, state, fns))
 		return NULL;
 	return state->lastadded;
 }
-static RJP_value* irjp_add_value_to_object(RJP_parse_state* state, const char* key, RJP_index keylen){
+static RJP_value* irjp_add_value_to_object(RJP_parse_state* state, const char* key, RJP_index keylen, const RJP_memory_fns* fns){
 	RJP_index newlen;
-	char* newkey = irjp_convert_string(key, keylen, &newlen);
+	char* newkey = irjp_convert_string(key, keylen, &newlen, fns);
 	if(!newlen){ //cannot have empty key
-		rjp_free(newkey);
+		fns->free(newkey);
 		return NULL;
 	}
-	return (state->lastadded = rjp_new_member_steal_key(state->curr, newkey, newlen));
+	return (state->lastadded = rjp_new_member_steal_key_c(state->curr, newkey, newlen, fns));
 }
 
 
@@ -176,25 +176,26 @@ static RJP_lex_category irjp_convert_comment(_Bool allow_comments){
 	return rjp_lex_invalid;
 }
 
-static void irjp_init_parse_state(RJP_parse_state* state, const char* str){
+static void irjp_init_parse_state(RJP_parse_state* state, const char* str, const RJP_memory_fns* fns){
 	state->column = 1;
 	state->row = 1;
 
 	irjp_init_parse_stack(&state->target_stack);
 	state->lexstate.str = (char*)str;
-	state->root = state->curr = state->lastadded = rjp_calloc(1, sizeof(RJP_value));
+	state->root = state->curr = state->lastadded = fns->alloc(sizeof(RJP_value));
+	memset(state->root, 0, sizeof(RJP_value));
 }
 static void irjp_delete_parse_state(RJP_parse_state* state){
 	irjp_delete_parse_stack(&state->target_stack);
 	irjp_delete_lex_state(&state->lexstate);
 }
-static void irjp_delete_parse_state_no_preserve_root(RJP_parse_state* state){
+static void irjp_delete_parse_state_no_preserve_root(RJP_parse_state* state, const RJP_memory_fns* fns){
 	irjp_delete_parse_state(state);
-	rjp_free_value(state->root);
+	rjp_free_value_c(state->root, fns);
 	state->root = NULL;
 }
 
-static int irjp_parse_handle_lexcat(RJP_lex_category cat, RJP_parse_state* state){
+static int irjp_parse_handle_lexcat(RJP_lex_category cat, RJP_parse_state* state, const RJP_memory_fns* fns){
 	if(cat == rjp_lex_line_comment || cat == rjp_lex_block_comment)
 		cat = irjp_convert_comment(state->allow_comments);
 
@@ -212,7 +213,7 @@ static int irjp_parse_handle_lexcat(RJP_lex_category cat, RJP_parse_state* state
 
 	case rjp_parse_start:
 		irjp_parse_stack_set(&state->target_stack, rjp_parse_end);
-		if(irjp_init_value(state->root, cat, state)){
+		if(irjp_init_value(state->root, cat, state, fns)){
 			return RJP_PARSE_STATUS_NO_ROOT_VALUE;
 		}
 		break;
@@ -225,7 +226,7 @@ static int irjp_parse_handle_lexcat(RJP_lex_category cat, RJP_parse_state* state
 	case rjp_parse_mem_key:
 			if(cat == rjp_lex_string){
 				irjp_parse_stack_set(&state->target_stack, rjp_parse_key_colon);
-				if(!irjp_add_value_to_object(state, state->lexstate.str+state->lexstate.offset, state->lexstate.length)){
+				if(!irjp_add_value_to_object(state, state->lexstate.str+state->lexstate.offset, state->lexstate.length, fns)){
 					return RJP_PARSE_STATUS_MISSING_KEY;
 				}
 			}else{
@@ -241,7 +242,7 @@ static int irjp_parse_handle_lexcat(RJP_lex_category cat, RJP_parse_state* state
 		//fallthrough
 	case rjp_parse_arr_value:
 				irjp_parse_stack_set(&state->target_stack, rjp_parse_arr_comma);
-			if(!irjp_add_value_to_array(cat, state))
+			if(!irjp_add_value_to_array(cat, state, fns))
 				return RJP_PARSE_STATUS_MISSING_VALUE;
 		}
 		break;
@@ -253,7 +254,7 @@ static int irjp_parse_handle_lexcat(RJP_lex_category cat, RJP_parse_state* state
 		break;
 	case rjp_parse_obj_value:
 		irjp_parse_stack_set(&state->target_stack, rjp_parse_obj_comma);
-		if(irjp_init_value(state->lastadded, cat, state)){
+		if(irjp_init_value(state->lastadded, cat, state, fns)){
 			return RJP_PARSE_STATUS_MISSING_VALUE;
 		}
 		break;
@@ -296,28 +297,31 @@ static int irjp_handle_final_parse_token(RJP_parse_state* state, RJP_lex_categor
 }
 
 //Basic parse loop
-static int irjp_parse(RJP_parse_state* state){
+static int irjp_parse(RJP_parse_state* state, const RJP_memory_fns* fns){
 	RJP_lex_category cat;
 	RJP_parse_status status;
 	for(cat = irjp_lex(&state->lexstate);cat & rjp_lex_accept;cat = irjp_lex(&state->lexstate),state->row += state->lexstate.length){
-		if((status = irjp_parse_handle_lexcat(cat, state)) != RJP_PARSE_STATUS_SUC)
+		if((status = irjp_parse_handle_lexcat(cat, state, fns)) != RJP_PARSE_STATUS_SUC)
 			return status;
 	}
 	return irjp_handle_final_parse_token(state, cat);
 }
 
 //Callback parse loop
-static int irjp_parse_cback(RJP_parse_state* state, RJP_parse_callback* cback){
+static int irjp_parse_cback(RJP_parse_state* state, RJP_parse_callback* cback, const RJP_memory_fns* fns){
 	RJP_lex_category cat;
 	RJP_parse_status status;
 	for(cat = irjp_lex_cback(&state->lexstate, cback);cat & rjp_lex_accept;cat = irjp_lex_cback(&state->lexstate, cback),state->row += state->lexstate.length){
-		if((status = irjp_parse_handle_lexcat(cat, state)) != RJP_PARSE_STATUS_SUC)
+		if((status = irjp_parse_handle_lexcat(cat, state, fns)) != RJP_PARSE_STATUS_SUC)
 			return status;
 	}
 	return irjp_handle_final_parse_token(state, cat);
 }
 
 char* rjp_parse_error_to_string(const RJP_parse_error* err){
+	return rjp_parse_error_to_string_c(err, &irjp_default_memory_fns);
+}
+char* rjp_parse_error_to_string_c(const RJP_parse_error* err, const RJP_memory_fns* fns){
 	const RJP_parse_state* state = (const RJP_parse_state*)err->parsestate;
 	RJP_parse_status status = err->errcode;
 	char* buffer = NULL;
@@ -325,42 +329,42 @@ char* rjp_parse_error_to_string(const RJP_parse_error* err){
 	switch(status){
 	case RJP_PARSE_STATUS_MISSING_VALUE:
 		format = "Expected value before '%.*s'";
-		buffer = rjp_alloc(snprintf(NULL, 0, format, (int)state->lexstate.length, (state->lexstate.str + state->lexstate.offset)) + 1);
+		buffer = fns->alloc(snprintf(NULL, 0, format, (int)state->lexstate.length, (state->lexstate.str + state->lexstate.offset)) + 1);
 		sprintf(buffer, format, (int)state->lexstate.length, (state->lexstate.str + state->lexstate.offset));
 		break;
 	case RJP_PARSE_STATUS_MISSING_COMMA:
 		format = "Expected comma before '%.*s'";
-		buffer = rjp_alloc(snprintf(NULL, 0, format, (int)state->lexstate.length, (state->lexstate.str + state->lexstate.offset)) + 1);
+		buffer = fns->alloc(snprintf(NULL, 0, format, (int)state->lexstate.length, (state->lexstate.str + state->lexstate.offset)) + 1);
 		sprintf(buffer, format, (int)state->lexstate.length, (state->lexstate.str + state->lexstate.offset));
 		break;
 	case RJP_PARSE_STATUS_INVALID:
 		format = "Invalid lex token '%.*s'";
-		buffer = rjp_alloc(snprintf(NULL, 0, format, (int)state->lexstate.length, (state->lexstate.str + state->lexstate.offset)) + 1);
+		buffer = fns->alloc(snprintf(NULL, 0, format, (int)state->lexstate.length, (state->lexstate.str + state->lexstate.offset)) + 1);
 		sprintf(buffer, format, (int)state->lexstate.length, (state->lexstate.str + state->lexstate.offset));
 		break;
 	case RJP_PARSE_STATUS_NO_ROOT_VALUE:
 		format = "Missing root JSON value";
-		buffer = rjp_alloc(snprintf(NULL, 0, "%s", format) + 1);
+		buffer = fns->alloc(snprintf(NULL, 0, "%s", format) + 1);
 		sprintf(buffer, "%s", format);
 		break;
 	case RJP_PARSE_STATUS_MISSING_KEY:
 		format = "Expected key before '%.*s'";
-		buffer = rjp_alloc(snprintf(NULL, 0, format, (int)state->lexstate.length, (state->lexstate.str + state->lexstate.offset)) + 1);
+		buffer = fns->alloc(snprintf(NULL, 0, format, (int)state->lexstate.length, (state->lexstate.str + state->lexstate.offset)) + 1);
 		sprintf(buffer, format, (int)state->lexstate.length, (state->lexstate.str + state->lexstate.offset));
 		break;
 	case RJP_PARSE_STATUS_MISSING_COLON:
 		format = "Expected colon before '%.*s'";
-		buffer = rjp_alloc(snprintf(NULL, 0, format, (int)state->lexstate.length, (state->lexstate.str + state->lexstate.offset)) + 1);
+		buffer = fns->alloc(snprintf(NULL, 0, format, (int)state->lexstate.length, (state->lexstate.str + state->lexstate.offset)) + 1);
 		sprintf(buffer, format, (int)state->lexstate.length, (state->lexstate.str + state->lexstate.offset));
 		break;
 	case RJP_PARSE_STATUS_EXCESS_DATA:
 		format = "Excess data after JSON";
-		buffer = rjp_alloc(snprintf(NULL, 0, "%s", format) + 1);
+		buffer = fns->alloc(snprintf(NULL, 0, "%s", format) + 1);
 		sprintf(buffer, "%s", format);
 		break;
 	case RJP_PARSE_STATUS_MISSING_CLOSE_BRACE:
 		format = "Missing closing brace";
-		buffer = rjp_alloc(snprintf(NULL, 0, "%s", format) + 1);
+		buffer = fns->alloc(snprintf(NULL, 0, "%s", format) + 1);
 		sprintf(buffer, "%s", format);
 		break;
 	default:
@@ -369,22 +373,28 @@ char* rjp_parse_error_to_string(const RJP_parse_error* err){
 	return buffer;
 }
 void rjp_delete_parse_error(RJP_parse_error* err){
-	irjp_delete_parse_state_no_preserve_root((RJP_parse_state*)err->parsestate);
+	rjp_delete_parse_error_c(err, &irjp_default_memory_fns);
+}
+void rjp_delete_parse_error_c(RJP_parse_error* err, const RJP_memory_fns* fns){
+	irjp_delete_parse_state_no_preserve_root((RJP_parse_state*)err->parsestate, fns);
 	rjp_free(err->parsestate);
 }
 
 RJP_value* rjp_simple_parse(const char* str){
-	return rjp_parse(str, RJP_PARSE_NO_EXT, NULL);
+	return rjp_parse_c(str, RJP_PARSE_NO_EXT, NULL, &irjp_default_memory_fns);
 }
 
 RJP_value* rjp_parse(const char* str, int flags, RJP_parse_error* err){
+	return rjp_parse_c(str, flags, err, &irjp_default_memory_fns);
+}
+RJP_value* rjp_parse_c(const char* str, int flags, RJP_parse_error* err, const RJP_memory_fns* fns){
 	RJP_parse_state* state = rjp_calloc(sizeof(RJP_parse_state), 1);
 	state->allow_comments = (flags & RJP_PARSE_ALLOW_COMMENTS);
 	state->allow_trail_comma = (flags & RJP_PARSE_ALLOW_TRAILING_COMMA);
 
-	irjp_init_parse_state(state, str);
+	irjp_init_parse_state(state, str, fns);
 	irjp_init_lex_state(&state->lexstate);
-	int status = irjp_parse(state);
+	int status = irjp_parse(state, fns);
 	if(status == RJP_PARSE_STATUS_SUC){
 		irjp_delete_parse_state(state);
 		RJP_value* root = state->root;
@@ -397,7 +407,7 @@ RJP_value* rjp_parse(const char* str, int flags, RJP_parse_error* err){
 			err->row = state->column;
 			err->column = state->row;
 		}else{
-			irjp_delete_parse_state_no_preserve_root(state);
+			irjp_delete_parse_state_no_preserve_root(state, fns);
 			rjp_free(state);
 		}
 		return NULL;
@@ -407,13 +417,16 @@ RJP_value* rjp_parse(const char* str, int flags, RJP_parse_error* err){
 //Callback based parse. Runs identical to normal parsing except sets up callback
 //lex state and calls callback lex function
 RJP_value* rjp_parse_cback(int flags, RJP_parse_callback* cback, RJP_parse_error* err){
+	return rjp_parse_cback_c(flags, cback, err, &irjp_default_memory_fns);
+}
+RJP_value* rjp_parse_cback_c(int flags, RJP_parse_callback* cback, RJP_parse_error* err, const RJP_memory_fns* fns){
 	RJP_parse_state* state = rjp_calloc(sizeof(RJP_parse_state), 1);
 	state->allow_comments = (flags & RJP_PARSE_ALLOW_COMMENTS);
 	state->allow_trail_comma = (flags & RJP_PARSE_ALLOW_TRAILING_COMMA);
 
-	irjp_init_parse_state(state, NULL);
+	irjp_init_parse_state(state, NULL, fns);
 	irjp_init_lex_cback_state(&state->lexstate);
-	int status = irjp_parse_cback(state, cback);
+	int status = irjp_parse_cback(state, cback, fns);
 	if(status == RJP_PARSE_STATUS_SUC){
 		irjp_delete_parse_state(state);
 		RJP_value* root = state->root;
@@ -426,7 +439,7 @@ RJP_value* rjp_parse_cback(int flags, RJP_parse_callback* cback, RJP_parse_error
 			err->row = state->column;
 			err->column = state->row;
 		}else{
-			irjp_delete_parse_state_no_preserve_root(state);
+			irjp_delete_parse_state_no_preserve_root(state, fns);
 			rjp_free(state);
 		}
 		return NULL;
diff --git a/src/rjp_string.c b/src/rjp_string.c
index d642946..6b3518c 100644
--- a/src/rjp_string.c
+++ b/src/rjp_string.c
@@ -163,7 +163,7 @@ int irjp_copy_string_keyed(char* restrict dest, const char* restrict string, RJP
 	dest[offset] = ':';
 	return offset+1;
 }
-char* irjp_convert_string(const char* str, RJP_index length, RJP_index* newlen){
+char* irjp_convert_string(const char* str, RJP_index length, RJP_index* newlen, const RJP_memory_fns* fns){
 	char* newstring;
 	RJP_index oldpos = 1; //ignore opening quote
 	--length; //ignore closing quote
@@ -184,7 +184,7 @@ char* irjp_convert_string(const char* str, RJP_index length, RJP_index* newlen){
 			return NULL;
 		}
 	}
-	newstring = rjp_alloc(newlength + 1);
+	newstring = fns->alloc(newlength + 1);
 	newstring[newlength] = 0;
 	*newlen = newlength;
 	oldpos = 1;
@@ -276,8 +276,8 @@ RJP_index rjp_escape_strcpy(char* dest, const char* src){
 	dest[j] = 0;
 	return j;
 }
-void irjp_strcpy(RJP_string* dest, const RJP_string* src){
-	dest->value = rjp_alloc(src->length + 1);
+void irjp_strcpy(RJP_string* dest, const RJP_string* src, const RJP_memory_fns* fns){
+	dest->value = fns->alloc(src->length + 1);
 	strcpy(dest->value, src->value);
 	dest->value[src->length] = 0;
 	dest->length = src->length;
diff --git a/src/rjp_unordered_object.c b/src/rjp_unordered_object.c
index 0b4c8d3..5eede16 100644
--- a/src/rjp_unordered_object.c
+++ b/src/rjp_unordered_object.c
@@ -79,36 +79,36 @@ static RJP_tree_node* irjp_double_peek_tree_stack(RJP_tree_stack* stack){
 }
 
 /* RJP_OBJECT */
-void irjp_copy_unordered_object(RJP_value* dest, const RJP_value* src){
-	dest->object.root = irjp_copy_tree(src->object.root);
+void irjp_copy_unordered_object(RJP_value* dest, const RJP_value* src, const RJP_memory_fns* fns){
+	dest->object.root = irjp_copy_tree(src->object.root, fns);
 }
-void irjp_delete_unordered_object(RJP_value* obj){
-	irjp_free_tree(obj->object.root);
+void irjp_delete_unordered_object(RJP_value* obj, const RJP_memory_fns* fns){
+	irjp_free_tree(obj->object.root, fns);
 }
-RJP_value* irjp_add_unordered_member(RJP_value* dest, char* key, RJP_index keylen){
+RJP_value* irjp_add_unordered_member(RJP_value* dest, char* key, RJP_index keylen, const RJP_memory_fns* fns){
 	++dest->object.num_members;
 	int status;
 	RJP_value* retval;
-	dest->object.root = irjp_tree_insert_value(dest->object.root, key, keylen, &retval, &status);
+	dest->object.root = irjp_tree_insert_value(dest->object.root, key, keylen, &retval, &status, fns);
 	retval->parent = dest;
 	retval->type = rjp_json_null;
 	return retval;
 }
-RJP_value* irjp_remove_unordered_member(RJP_value* obj, RJP_value* member){
+RJP_value* irjp_remove_unordered_member(RJP_value* obj, RJP_value* member, const RJP_memory_fns* fns){
 	RJP_tree_node* removed_node = NULL;
 	obj->object.root = irjp_tree_remove_value(obj->object.root, (RJP_tree_node*)member, &removed_node);
-	rjp_free(((RJP_object_member*)removed_node)->name.value);
+	fns->free(((RJP_object_member*)removed_node)->name.value);
 	member->parent = NULL;
 	--obj->object.num_members;
 	return member;
 }
 
-void irjp_unordered_set_key(RJP_value* dest, char* key, RJP_index keylen){
+void irjp_unordered_set_key(RJP_value* dest, char* key, RJP_index keylen, const RJP_memory_fns* fns){
 	RJP_value* parent = dest->parent;
 	RJP_tree_node* removed_node = NULL;
 	parent->object.root = irjp_tree_remove_value(parent->object.root, (RJP_tree_node*)dest, &removed_node);
 
-	rjp_free(((RJP_object_member*)removed_node)->name.value);
+	fns->free(((RJP_object_member*)removed_node)->name.value);
 	((RJP_object_member*)removed_node)->name.value = key;
 	((RJP_object_member*)removed_node)->name.length = keylen;
 
diff --git a/src/tree.c b/src/tree.c
index c52a46e..4ac61a4 100644
--- a/src/tree.c
+++ b/src/tree.c
@@ -40,10 +40,10 @@ static inline int irjp_is_inside_right(RJP_tree_node* n);
 static void irjp_replace_node(RJP_tree_node *restrict node, RJP_tree_node *restrict child);
 
 static void irjp_copy_node_data(RJP_tree_node *restrict dest, RJP_tree_node *restrict src);
-static RJP_tree_node* irjp_clone_node(const RJP_tree_node* src, RJP_tree_node* parent);
-static RJP_tree_node* irjp_copy_node(const RJP_tree_node* root, RJP_tree_node* parent);
-static void irjp_free_node(RJP_tree_node* node);
-static void irjp_delete_node(RJP_tree_node* node);
+static RJP_tree_node* irjp_clone_node(const RJP_tree_node* src, RJP_tree_node* parent, const RJP_memory_fns* fns);
+static RJP_tree_node* irjp_copy_node(const RJP_tree_node* root, RJP_tree_node* parent, const RJP_memory_fns* fns);
+static void irjp_free_node(RJP_tree_node* node, const RJP_memory_fns* fns);
+static void irjp_delete_node(RJP_tree_node* node, const RJP_memory_fns* fns);
 
 static RJP_tree_node* irjp_tree_insert_impl(RJP_tree_node *restrict root, RJP_tree_node *restrict newnode);
 static RJP_tree_node* irjp_tree_repair(RJP_tree_node* node);
@@ -123,8 +123,9 @@ static void irjp_replace_node(RJP_tree_node *restrict node, RJP_tree_node *restr
 }
 
 //Node construction / destruction
-RJP_tree_node* irjp_new_node(char* key, RJP_index keylen){
-	RJP_tree_node* node = rjp_calloc(sizeof(RJP_tree_node), 1);
+RJP_tree_node* irjp_new_node(char* key, RJP_index keylen, const RJP_memory_fns* fns){
+	RJP_tree_node* node = fns->alloc(sizeof(RJP_tree_node));
+	memset(node, 0, sizeof(RJP_tree_node));
 	node->data.name.value = key;
 	node->data.name.length = keylen;
 	node->parent = node->left = node->right = NULL;
@@ -134,54 +135,55 @@ RJP_tree_node* irjp_new_node(char* key, RJP_index keylen){
 static void irjp_copy_node_data(RJP_tree_node *restrict dest, RJP_tree_node *restrict src){
 	dest->data = src->data;
 }
-static RJP_tree_node* irjp_clone_node(const RJP_tree_node* src, RJP_tree_node* parent){
-	RJP_tree_node* dest = rjp_calloc(1, sizeof(RJP_tree_node));
-	rjp_copy_value(&dest->data.value, &src->data.value);
-	irjp_strcpy(&dest->data.name, &src->data.name);
+static RJP_tree_node* irjp_clone_node(const RJP_tree_node* src, RJP_tree_node* parent, const RJP_memory_fns* fns){
+	RJP_tree_node* dest = fns->alloc(sizeof(RJP_tree_node));
+	memset(dest, 0, sizeof(RJP_tree_node));
+	rjp_copy_value_c(&dest->data.value, &src->data.value, fns);
+	irjp_strcpy(&dest->data.name, &src->data.name, fns);
 	dest->parent = parent;
 	return dest;
 }
-static RJP_tree_node* irjp_copy_node(const RJP_tree_node* root, RJP_tree_node* parent){
+static RJP_tree_node* irjp_copy_node(const RJP_tree_node* root, RJP_tree_node* parent, const RJP_memory_fns* fns){
 	if(!root){
 		return NULL;
 	}
-	RJP_tree_node* newnode = irjp_clone_node(root, parent);
-	newnode->left = irjp_copy_node(root->left, newnode);
-	newnode->right = irjp_copy_node(root->right, newnode);
+	RJP_tree_node* newnode = irjp_clone_node(root, parent, fns);
+	newnode->left = irjp_copy_node(root->left, newnode, fns);
+	newnode->right = irjp_copy_node(root->right, newnode, fns);
 	return newnode;
 }
-static void irjp_free_node(RJP_tree_node* node){
-	irjp_delete_node(node);
-	rjp_free(node);
+static void irjp_free_node(RJP_tree_node* node, const RJP_memory_fns* fns){
+	irjp_delete_node(node, fns);
+	fns->free(node);
 }
-static void irjp_delete_node(RJP_tree_node* node){
-	rjp_free(node->data.name.value);
-	irjp_delete_value(&node->data.value);
+static void irjp_delete_node(RJP_tree_node* node, const RJP_memory_fns* fns){
+	fns->free(node->data.name.value);
+	irjp_delete_value(&node->data.value, fns);
 }
 
 
 /* TREE */
 //Tree construction / destruction
-RJP_tree_node* irjp_copy_tree(const RJP_tree_node* root){
-	return irjp_copy_node(root, NULL);
+RJP_tree_node* irjp_copy_tree(const RJP_tree_node* root, const RJP_memory_fns* fns){
+	return irjp_copy_node(root, NULL, fns);
 }
-void irjp_free_tree(RJP_tree_node* root){
+void irjp_free_tree(RJP_tree_node* root, const RJP_memory_fns* fns){
 	if(!root)
 		return;
-	irjp_free_tree(root->left);
-	irjp_free_tree(root->right);
-	irjp_free_node(root);
+	irjp_free_tree(root->left, fns);
+	irjp_free_tree(root->right, fns);
+	irjp_free_node(root, fns);
 }
 //Tree operations
-RJP_tree_node* irjp_tree_insert_value(RJP_tree_node* root, char* key, RJP_index keylen, RJP_value** added, int* status){
+RJP_tree_node* irjp_tree_insert_value(RJP_tree_node* root, char* key, RJP_index keylen, RJP_value** added, int* status, const RJP_memory_fns* fns){
 	*status = RJP_TREE_SUCCESS;
 	if(!root){
-		root = irjp_new_node(key, keylen);
+		root = irjp_new_node(key, keylen, fns);
 		if(added)
 			*added = &root->data.value;
 		return root;
 	}
-	RJP_tree_node* newnode = irjp_new_node(key, keylen);
+	RJP_tree_node* newnode = irjp_new_node(key, keylen, fns);
 	if(added)
 		*added = &newnode->data.value;
 	return irjp_tree_insert_node(root, newnode);