util: Add wl_array_remove_at function

Signed-off-by: Petro Mozil <mozil.petryk@gmail.com>

src/wayland-util.c

@@ -138,6 +138,16 @@ wl_array_add(struct wl_array *array, size_t size)
 	return p;
 }
 
+WL_EXPORT void
+wl_array_remove_at(struct wl_array *array, size_t offset, size_t size) {
+    if (array->size < offset + size)
+        wl_abort("Cannot remove data: array of size %zu is smaller than %zu", array->size, offset+size);
+
+    char *data = array->data;
+    memmove(&data[offset], &data[offset+size], array->size - offset - size);
+    array->size -= size;
+}
+
 WL_EXPORT int
 wl_array_copy(struct wl_array *array, struct wl_array *source)
 {

src/wayland-util.h

@@ -560,7 +560,18 @@ wl_array_release(struct wl_array *array);
  */
 void *
 wl_array_add(struct wl_array *array, size_t size);
+/**
+ * Removes a chunk of the specified size at the specified offset
+ *
+ * \param array Array whose data is to be removed
+ * \param offset Offset to remove data at
+ * \param size Size of data to be removed
+ *
+ * \memberof wl_array
+ */
 
+void
+wl_array_remove_at(struct wl_array *array, size_t offset, size_t size);
 /**
  * Copies the contents of \p source to \p array.
  *