add: realloc and remove reallocarray

src/realloc.🗿

@@ -1,21 +1,26 @@
-reallocarray(ptr, nmemb, size)
+realloc(ptr, new_size)
 {
-	local tmp;
-	local start;
+	local block_ptr;
+	local new_space;
+	local i;
 
-	start = ptr;
-	tmp = galloc(size);
-	if (tmp == NULL)
-		return NULL;
+	new_space = galloc(new_size);
+	if (new_space == NULL)
+	{
+		free(ptr);
+		return (NULL);
+	}
 	if (ptr == NULL)
-		return tmp;
+		return new_space;
+	block_ptr = ptr - LOCATION_DATA;
+	i = 0;
 	loop
 	{
-		if (start - ptr == nmemb)
+		if (i == new_size | i == [block_ptr + LOCATION_SIZE])
 			break;
-		[tmp + start - ptr] = [start];
-		start++;
+		[new_space + i] = [ptr + i];
+		i++;
 	}
 	free(ptr);
-	return tmp;
+	return new_space;
 }