list: add vlist_{insert, remove, remove_all}() and corresponding tests

common/include/villas/list.h

@@ -87,7 +87,11 @@ int vlist_destroy(struct vlist *l, dtor_cb_t dtor, bool free);
 void vlist_push(struct vlist *l, void *p);
 
 /** Remove all occurences of a list item */
-void vlist_remove(struct vlist *l, void *p);
+void vlist_remove_all(struct vlist *l, void *p);
+
+int vlist_remove(struct vlist *l, size_t idx);
+
+int vlist_insert(struct vlist *l, size_t idx, void *p);
 
 /** Return the first list element which is identified by a string in its first member variable.
  *
@@ -132,6 +136,7 @@ void vlist_extend(struct vlist *l, size_t len, void *val);
 /** Shallow copy a list. */
 int vlist_copy(struct vlist *dst, const struct vlist *src);
 
+
 #ifdef __cplusplus
 }
 #endif

common/lib/list.c

@@ -111,7 +111,59 @@ void vlist_push(struct vlist *l, void *p)
 	pthread_mutex_unlock(&l->lock);
 }
 
-void vlist_remove(struct vlist *l, void *p)
+int vlist_remove(struct vlist *l, size_t idx)
+{
+	pthread_mutex_lock(&l->lock);
+
+	assert(l->state == STATE_INITIALIZED);
+
+	if (idx >= l->length)
+		return -1;
+
+	for (size_t i = idx; i < l->length - 1; i++)
+		l->array[i] = l->array[i+1];
+
+	l->length--;
+
+	pthread_mutex_unlock(&l->lock);
+
+	return 0;
+}
+
+int vlist_insert(struct vlist *l, size_t idx, void *p)
+{
+	size_t i;
+	void *t, *o;
+
+	pthread_mutex_lock(&l->lock);
+
+	assert(l->state == STATE_INITIALIZED);
+
+	if (idx >= l->length)
+		return -1;
+
+	/* Resize array if out of capacity */
+	if (l->length + 1 > l->capacity) {
+		l->capacity += LIST_CHUNKSIZE;
+		l->array = realloc(l->array, l->capacity * sizeof(void *));
+	}
+
+	o = p;
+	for (i = idx; i < l->length; i++) {
+		t = l->array[i];
+		l->array[i] = o;
+		o = t;
+	}
+
+	l->array[l->length] = o;
+	l->length++;
+
+	pthread_mutex_unlock(&l->lock);
+
+	return 0;
+}
+
+void vlist_remove_all(struct vlist *l, void *p)
 {
 	int removed = 0;
 

common/tests/unit/list.cpp

@@ -155,7 +155,24 @@ Test(list, basics)
 	ret = vlist_contains(&l, (void *) 55);
 	cr_assert(ret);
 
-	vlist_remove(&l, (void *) 55);
+	void *before_ptr = vlist_at(&l, 12);
+
+	ret = vlist_insert(&l, 12, (void *) 123);
+	cr_assert_eq(ret, 0);
+	cr_assert_eq(vlist_at(&l, 12), (void *) 123, "Is: %p", vlist_at(&l, 12));
+
+	ret = vlist_remove(&l, 12);
+	cr_assert_eq(ret, 0);
+	cr_assert_eq(vlist_at(&l, 12), before_ptr);
+
+	int counts, before_len;
+
+	before_len = vlist_length(&l);
+	counts = vlist_contains(&l, (void *) 55);
+	cr_assert_gt(counts, 0);
+
+	vlist_remove_all(&l, (void *) 55);
+	cr_assert_eq(vlist_length(&l), before_len - counts);
 
 	ret = vlist_contains(&l, (void *) 55);
 	cr_assert(!ret);