From c6dfae26cb4bce87d37d0547918e8d97c9bd915b Mon Sep 17 00:00:00 2001
From: Eric Fischer <enf@pobox.com>
Date: Fri, 23 Oct 2015 14:58:50 -0700
Subject: [PATCH] Add a function to disconnect a JSON object from the parse
 tree

---
 jsonpull.c | 12 +++++++++++-
 jsonpull.h |  1 +
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/jsonpull.c b/jsonpull.c
index fc85b92d..212ca2c9 100644
--- a/jsonpull.c
+++ b/jsonpull.c
@@ -568,11 +568,19 @@ void json_free(json_object *o) {
 		free(o->string);
 	}
 
+	json_disconnect(o);
+
+	free(o);
+}
+
+void json_disconnect(json_object *o) {
 	// Expunge references to this as an array element
 	// or a hash key or value.
 
 	if (o->parent != NULL) {
 		if (o->parent->type == JSON_ARRAY) {
+			int i;
+
 			for (i = 0; i < o->parent->length; i++) {
 				if (o->parent->array[i] == o) {
 					break;
@@ -586,6 +594,8 @@ void json_free(json_object *o) {
 		}
 
 		if (o->parent->type == JSON_HASH) {
+			int i;
+
 			for (i = 0; i < o->parent->length; i++) {
 				if (o->parent->keys[i] == o) {
 					o->parent->keys[i] = fabricate_object(o->parent, JSON_NULL);
@@ -612,5 +622,5 @@ void json_free(json_object *o) {
 		}
 	}
 
-	free(o);
+	o->parent = NULL;
 }
diff --git a/jsonpull.h b/jsonpull.h
index f5ccbeeb..645f47c2 100644
--- a/jsonpull.h
+++ b/jsonpull.h
@@ -59,5 +59,6 @@ json_object *json_read_tree(json_pull *j);
 json_object *json_read(json_pull *j);
 json_object *json_read_separators(json_pull *j, json_separator_callback cb, void *state);
 void json_free(json_object *j);
+void json_disconnect(json_object *j);
 
 json_object *json_hash_get(json_object *o, const char *s);