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Add cJSON_DetachItemViaPointer

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This commit is contained in:
Max Bruckner 2017-05-01 23:15:00 +02:00
parent cc3a75dd39
commit c24c3e0285
3 changed files with 71 additions and 0 deletions
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30
cJSON.c
View File

@ -1814,6 +1814,36 @@ CJSON_PUBLIC(void) cJSON_AddItemReferenceToObject(cJSON *object, const char *str
cJSON_AddItemToObject(object, string, create_reference(item, &global_hooks));
}
CJSON_PUBLIC(cJSON *) cJSON_DetachItemViaPointer(cJSON *parent, cJSON * const item)
{
if ((parent == NULL) || (item == NULL))
{
return NULL;
}
if (item->prev != NULL)
{
/* not the first element */
item->prev->next = item->next;
}
if (item->next != NULL)
{
/* not the last element */
item->next->prev = item->prev;
}
if (item == parent->child)
{
/* first element */
parent->child = item->next;
}
/* make sure the detached item doesn't point anywhere anymore */
item->prev = NULL;
item->next = NULL;
return item;
}
static cJSON *DetachItemFromArray(cJSON *array, size_t which)
{
cJSON *c = array->child;

1
cJSON.h
View File

@ -203,6 +203,7 @@ CJSON_PUBLIC(void) cJSON_AddItemReferenceToArray(cJSON *array, cJSON *item);
CJSON_PUBLIC(void) cJSON_AddItemReferenceToObject(cJSON *object, const char *string, cJSON *item);
/* Remove/Detatch items from Arrays/Objects. */
CJSON_PUBLIC(cJSON *) cJSON_DetachItemViaPointer(cJSON *parent, cJSON * const item);
CJSON_PUBLIC(cJSON *) cJSON_DetachItemFromArray(cJSON *array, int which);
CJSON_PUBLIC(void) cJSON_DeleteItemFromArray(cJSON *array, int which);
CJSON_PUBLIC(cJSON *) cJSON_DetachItemFromObject(cJSON *object, const char *string);

40
tests/misc_tests.c
View File

@ -218,6 +218,45 @@ static void cjson_set_number_value_should_set_numbers(void)
TEST_ASSERT_EQUAL_DOUBLE(-1 + (double)INT_MIN, number->valuedouble);
}
static void cjson_detach_item_via_pointer_should_detach_items(void)
{
cJSON list[4];
cJSON parent[1];
memset(list, '\0', sizeof(list));
/* link the list */
list[0].next = &(list[1]);
list[1].next = &(list[2]);
list[2].next = &(list[3]);
list[3].prev = &(list[2]);
list[2].prev = &(list[1]);
list[1].prev = &(list[0]);
parent->child = &list[0];
/* detach in the middle (list[1]) */
TEST_ASSERT_TRUE_MESSAGE(cJSON_DetachItemViaPointer(parent, &(list[1])) == &(list[1]), "Failed to detach in the middle.");
TEST_ASSERT_TRUE_MESSAGE((list[1].prev == NULL) && (list[1].next == NULL), "Didn't set pointers of detached item to NULL.");
TEST_ASSERT_TRUE((list[0].next == &(list[2])) && (list[2].prev == &(list[0])));
/* detach beginning (list[0]) */
TEST_ASSERT_TRUE_MESSAGE(cJSON_DetachItemViaPointer(parent, &(list[0])) == &(list[0]), "Failed to detach beginning.");
TEST_ASSERT_TRUE_MESSAGE((list[0].prev == NULL) && (list[0].next == NULL), "Didn't set pointers of detached item to NULL.");
TEST_ASSERT_TRUE_MESSAGE((list[2].prev == NULL) && (parent->child == &(list[2])), "Didn't set the new beginning.");
/* detach end (list[3])*/
TEST_ASSERT_TRUE_MESSAGE(cJSON_DetachItemViaPointer(parent, &(list[3])) == &(list[3]), "Failed to detach end.");
TEST_ASSERT_TRUE_MESSAGE((list[3].prev == NULL) && (list[3].next == NULL), "Didn't set pointers of detached item to NULL.");
TEST_ASSERT_TRUE_MESSAGE((list[2].next == NULL) && (parent->child == &(list[2])), "Didn't set the new end");
/* detach single item (list[2]) */
TEST_ASSERT_TRUE_MESSAGE(cJSON_DetachItemViaPointer(parent, &list[2]) == &list[2], "Failed to detach single item.");
TEST_ASSERT_TRUE_MESSAGE((list[2].prev == NULL) && (list[2].next == NULL), "Didn't set pointers of detached item to NULL.");
TEST_ASSERT_NULL_MESSAGE(parent->child, "Child of the parent wasn't set to NULL.");
}
int main(void)
{
UNITY_BEGIN();
@ -229,6 +268,7 @@ int main(void)
RUN_TEST(typecheck_functions_should_check_type);
RUN_TEST(cjson_should_not_parse_to_deeply_nested_jsons);
RUN_TEST(cjson_set_number_value_should_set_numbers);
RUN_TEST(cjson_detach_item_via_pointer_should_detach_items);
return UNITY_END();
}