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json_object: implement json_object_deep_copy()

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Because doing `json_tokener_parse(json_object_get_string(src))`
feels sloppy, dirty, and makes me want to cry at night
sometimes.

Signed-off-by: Alexandru Ardelean <ardeleanalex@gmail.com>
This commit is contained in:
Alexandru Ardelean
2017-06-16 10:05:32 +03:00
parent 91662a5b69
commit bf80d5ad0e
2 changed files with 121 additions and 0 deletions
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103
json_object.c
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@@ -1313,3 +1313,106 @@ int json_object_equal(struct json_object* jso1, struct json_object* jso2)
return 0;
}
static int json_object_copy_serializer_data(struct json_object *src, struct json_object *dst)
{
/* FIXME: this is shared between copies ; maybe add a `_user_copy` cb here */
dst->_userdata = src->_userdata;
dst->_to_json_string = src->_to_json_string;
dst->_user_delete = src->_user_delete;
return 0;
}
static int json_object_deep_copy_recursive(struct json_object *src, struct json_object **dst)
{
struct json_object *jso = NULL;
struct json_object_iter iter;
size_t i;
if (!src || !dst) {
errno = EINVAL;
return -1;
}
switch (src->o_type) {
case json_type_boolean:
*dst = json_object_new_boolean(src->o.c_boolean);
break;
case json_type_double:
*dst = json_object_new_double(src->o.c_double);
break;
case json_type_int:
*dst = json_object_new_int64(src->o.c_int64);
break;
case json_type_string:
*dst = json_object_new_string(get_string_component(src));
break;
case json_type_object:
*dst = json_object_new_object();
if (!*dst) {
errno = ENOMEM;
return -1;
}
json_object_object_foreachC(src, iter) {
/* This handles the `json_type_null` case */
if (!iter.val)
jso = NULL;
else if (json_object_deep_copy_recursive(iter.val, &jso) < 0)
return -1;
if (json_object_object_add(*dst, iter.key, jso) < 0)
return -1;
}
break;
case json_type_array:
*dst = json_object_new_array();
if (!*dst) {
errno = ENOMEM;
return -1;
}
for (i = 0; i < json_object_array_length(src); i++) {
struct json_object *jso1 = json_object_array_get_idx(src, i);
/* This handles the `json_type_null` case */
if (!jso1)
jso = NULL;
else if (json_object_deep_copy_recursive(jso1, &jso) < 0)
return -1;
if (json_object_array_add(*dst, jso) < 0)
return -1;
}
break;
default:
errno = EINVAL;
return -1;
};
/* errno should be set by the function that faulted */
if (!*dst)
return -1;
return json_object_copy_serializer_data(src, *dst);
}
int json_object_deep_copy(struct json_object *src, struct json_object **dst)
{
int rc;
/* Check if arguments are sane ; *dst must not point to a non-NULL object */
if (!src || !dst || *dst) {
errno = EINVAL;
return -1;
}
rc = json_object_deep_copy_recursive(src, dst);
if (rc < 0) {
json_object_put(*dst);
*dst = NULL;
}
return rc;
}