io: store current directory iterator filepath as a b_path

io/sys/windows/directory.c

@@ -153,8 +153,23 @@ static void cleanup_iterator(struct b_directory_iterator *it)
 
 static void update_iterator_data(struct b_directory_iterator *it)
 {
+	if (it->filepath) {
+		b_path_release(B_PATH(it->filepath));
+		it->filepath = NULL;
+	}
+
 	struct iteration_state *state = get_iteration_state(it->_z);
 	it->filename = state->data.cFileName;
+
+	struct b_path *filename = b_path_create_from_cstr(it->filename);
+
+	const struct b_path *parts[] = {
+		state->search_path,
+		filename,
+	};
+
+	it->filepath
+		= b_path_join(parts, sizeof parts / sizeof parts[0]);
 }
 
 static bool move_into_directory(struct b_directory_iterator *it, const char *dir_name)

io/sys/windows/path.c

@@ -166,14 +166,17 @@ struct b_path *b_path_join(
 
 struct b_path *b_path_make_absolute(const struct b_path *in)
 {
+	return NULL;
 }
 
 struct b_path *b_path_make_relative(const struct b_path *in)
 {
+	return NULL;
 }
 
 struct b_path *b_path_make_canonical(const struct b_path *in)
 {
+	return NULL;
 }
 
 bool b_path_is_absolute(const struct b_path *path)
@@ -202,17 +205,28 @@ bool b_path_is_absolute(const struct b_path *path)
 
 bool b_path_exists(const struct b_path *path)
 {
-
+	DWORD attrib = GetFileAttributesA(b_path_ptr(path));
+	return attrib != INVALID_FILE_ATTRIBUTES;
 }
 
 bool b_path_is_file(const struct b_path *path)
 {
+	DWORD attrib = GetFileAttributesA(b_path_ptr(path));
+	if (attrib == INVALID_FILE_ATTRIBUTES) {
+		return false;
+	}
 
+	return (attrib & FILE_ATTRIBUTE_NORMAL) != 0;
 }
 
 bool b_path_is_directory(const struct b_path *path)
 {
+	DWORD attrib = GetFileAttributesA(b_path_ptr(path));
+	if (attrib == INVALID_FILE_ATTRIBUTES) {
+		return false;
+	}
 
+	return (attrib & FILE_ATTRIBUTE_DIRECTORY) != 0;
 }
 
 const char *b_path_ptr(const struct b_path *path)
@@ -220,17 +234,10 @@ const char *b_path_ptr(const struct b_path *path)
 	return b_string_ptr(path->pathstr);
 }
 
-struct b_path *b_path_retain(struct b_path *path)
-{
-}
-
-void b_path_release(struct b_path *path)
-{
-}
-
 void path_release(struct b_object* obj)
 {
-	b_path_release((struct b_path *)obj);
+	struct b_path *path = B_PATH(obj);
+	b_string_release(path->pathstr);
 }
 
 void path_to_string(struct b_object* obj, struct b_stringstream* out)