Order of items in an array is preserved after removing an item.

Issue #81

parson.c

@@ -1547,20 +1547,13 @@ void json_free_serialized_string(char *string) {
 }
 
 JSON_Status json_array_remove(JSON_Array *array, size_t ix) {
-    JSON_Value *temp_value = NULL;
-    size_t last_element_ix = 0;
+    size_t to_move_bytes = 0;
     if (array == NULL || ix >= json_array_get_count(array)) {
         return JSONFailure;
     }
-    last_element_ix = json_array_get_count(array) - 1;
     json_value_free(json_array_get_value(array, ix));
-    if (ix != last_element_ix) { /* Replace value with one from the end of array */
-        temp_value = json_array_get_value(array, last_element_ix);
-        if (temp_value == NULL) {
-            return JSONFailure;
-        }
-        array->items[ix] = temp_value;
-    }
+    to_move_bytes = (json_array_get_count(array) - 1 - ix) * sizeof(JSON_Value**);
+    memmove(array->items + ix, array->items + ix + 1, to_move_bytes);
     array->count -= 1;
     return JSONSuccess;
 }
@@ -1918,7 +1911,7 @@ JSON_Status json_validate(const JSON_Value *schema, const JSON_Value *value) {
     }
 }
 
-JSON_Status json_value_equals(const JSON_Value *a, const JSON_Value *b) {
+int json_value_equals(const JSON_Value *a, const JSON_Value *b) {
     JSON_Object *a_object = NULL, *b_object = NULL;
     JSON_Array *a_array = NULL, *b_array = NULL;
     const char *a_string = NULL, *b_string = NULL;

tests.c

@@ -263,6 +263,7 @@ void test_suite_3(void) {
     TEST(json_parse_string("x") == NULL);
     TEST(json_parse_string("{:\"no name\"}") == NULL);
     TEST(json_parse_string("[,\"no first value\"]") == NULL);
+    TEST(json_parse_string("{\"key\"\"value\"}") == NULL);
     TEST(json_parse_string("[\"\\u00zz\"]") == NULL); /* invalid utf value */
     TEST(json_parse_string("[\"\\u00\"]") == NULL); /* invalid utf value */
     TEST(json_parse_string("[\"\\u\"]") == NULL); /* invalid utf value */
@@ -306,6 +307,9 @@ void test_suite_5(void) {
     JSON_Object *obj = NULL;
     JSON_Array *interests_arr = NULL;
 
+    JSON_Value *remove_test_val = NULL;
+    JSON_Array *remove_test_arr = NULL;
+
     val = json_value_init_object();
     TEST(val != NULL);
 
@@ -407,6 +411,16 @@ void test_suite_5(void) {
     TEST(json_object_set_string(obj, "single surrogate 1", "\xed\xa0\x80") == JSONFailure);
     TEST(json_object_set_string(obj, "single surrogate 2", "\xed\xaf\xbf") == JSONFailure);
     TEST(json_object_set_string(obj, "single surrogate 3", "\xed\xbf\xbf") == JSONFailure);
+
+    /* Testing removing values from array, order of the elements should be preserved */
+    remove_test_val = json_parse_string("[1, 2, 3, 4, 5]");
+    remove_test_arr = json_array(remove_test_val);
+    json_array_remove(remove_test_arr, 2);
+    TEST(json_value_equals(remove_test_val, json_parse_string("[1, 2, 4, 5]")));
+    json_array_remove(remove_test_arr, 0);
+    TEST(json_value_equals(remove_test_val, json_parse_string("[2, 4, 5]")));
+    json_array_remove(remove_test_arr, 2);
+    TEST(json_value_equals(remove_test_val, json_parse_string("[2, 4]")));
 }
 
 void test_suite_6(void) {