Fixed semantics of tox_array (should also be more memory efficient).

testing/misc_tools.h

@@ -26,6 +26,7 @@
 
 #include <stdlib.h>
 #include <stdint.h>
+#include <string.h> /* for memcpy() */
 
 unsigned char *hex_string_to_bin(char hex_string[]);
 
@@ -67,6 +68,7 @@ unsigned char *hex_string_to_bin(char hex_string[]);
 
 /************************Linked List***********************
  * http://wiki.tox.im/index.php/Internal_functions_and_data_structures#Linked_List
+ * TODO: Update wiki.
  **********************************************************/
 
 #define MEMBER_OFFSET(var_name_in_parent, parent_type) \
@@ -76,22 +78,22 @@ unsigned char *hex_string_to_bin(char hex_string[]);
    ((parent_type*)((uint64_t)(&(var)) - (uint64_t)(MEMBER_OFFSET(var_name_in_parent, parent_type))))
 
 #define TOX_LIST_FOR_EACH(lst, tmp_name) \
-   for (tox_list_t* tmp_name = lst.next; tmp_name != &lst; tmp_name = tmp_name->next)
+   for (tox_list* tmp_name = lst.next; tmp_name != &lst; tmp_name = tmp_name->next)
 
 #define TOX_LIST_GET_VALUE(tmp_name, name_in_parent, parent_type) GET_PARENT(tmp_name, name_in_parent, parent_type)
 
 typedef struct tox_list {
     struct tox_list *prev, *next;
-} tox_list_t;
+} tox_list;
 
 /* Returns a new tox_list_t. */
-static inline void tox_list_new(tox_list_t *lst)
+static inline void tox_list_new(tox_list *lst)
 {
     lst->prev = lst->next = lst;
 }
 
 /* Inserts a new tox_lst after lst and returns it. */
-static inline void tox_list_add(tox_list_t *lst, tox_list_t *new_lst)
+static inline void tox_list_add(tox_list *lst, tox_list *new_lst)
 {
     tox_list_new(new_lst);
 
@@ -102,61 +104,60 @@ static inline void tox_list_add(tox_list_t *lst, tox_list_t *new_lst)
     new_lst->prev = lst;
 }
 
-static inline void tox_list_remove(tox_list_t *lst)
+static inline void
+tox_list_remove(tox_list *lst)
 {
     lst->prev->next = lst->next;
     lst->next->prev = lst->prev;
 }
 
 /****************************Array***************************
- * Array to store pointers which tracks it's own size.
- * TODO: Figure out if it shold store values instead of
- * pointers?
+ * Array which manages its own memory allocation.
+ * It stores copy of data (not pointers).
  * TODO: Add wiki info usage.
  ************************************************************/
 
-struct tox_array {
-    void **data;
-    uint32_t size, length;
-};
+typedef struct tox_array {
+    void *data;
+    uint32_t len;
+    size_t elem_size; /* in bytes */
+} tox_array;
 
-static inline void tox_array_init(struct tox_array *arr)
+static inline void
+tox_array_init(tox_array *arr, size_t elem_size)
 {
-    arr->size = 1;
-    arr->length = 0;
-    arr->data = malloc(sizeof(void *));
+    arr->len = 0;
+    arr->elem_size = elem_size;
+    arr->data = NULL;
 }
 
-static inline void tox_array_delete(struct tox_array *arr)
+static inline void
+tox_array_delete(tox_array *arr)
 {
     free(arr->data);
-    arr->size = arr->length = 0;
+    arr->len = arr->elem_size = 0;
 }
 
-/* shrinks arr so it will not have unused space. If you want to have
- * addtional space, extra species the amount of extra space.
+static inline void
+_tox_array_push(tox_array *arr, uint8_t *item)
+{
+    arr->data = realloc(arr->data, arr->elem_size * (arr->len+1));
+
+    memcpy(arr->data + arr->elem_size*arr->len, item, arr->elem_size);
+    arr->len++;
+}
+#define tox_array_push(arr, item) _tox_array_push(arr, (void*)(&(item)))
+
+/* Deletes num items from array.
+ * Not same as pop in stacks, because to access elements you use data.
  */
-static inline void tox_array_shrink_to_fit(struct tox_array *arr, int32_t extra)
+static inline void
+tox_array_pop(tox_array *arr, uint32_t num)
 {
-    arr->size = arr->length + extra;
-    arr->data = realloc(arr->data, arr->size * sizeof(void *));
+    arr->len--;
+    arr->data = realloc(arr->data, arr->elem_size*arr->len);
 }
 
-static inline void _tox_array_push(struct tox_array *arr, void *new)
-{
-    if (arr->length + 1 >= arr->size)
-        tox_array_shrink_to_fit(arr, arr->size);
-
-    arr->data[arr->length++] = new;
-}
-#define tox_array_push(arr, new) _tox_array_push(arr, (void*)new)
-
-static inline void *tox_array_pop(struct tox_array *arr)
-{
-    if (arr->length - 1 < arr->size / 4)
-        tox_array_shrink_to_fit(arr, arr->length * 2);
-
-    return arr->data[arr->length--];
-}
+#define tox_array_get(arr, i, type) ((type*)(arr)->data)[i]
 
 #endif // MISC_TOOLS_H