Add asset saving

source/engine/resources.c

@@ -21,6 +21,7 @@ struct vec *prefabs = NULL;
 
 const char *EXT_PREFAB = ".prefab";
 const char *EXT_LEVEL = ".level";
+const char *EXT_ASSET = ".asset";
 int stemlen = 0;
 
 static const char *cur_ext = NULL;
@@ -100,6 +101,16 @@ void findPrefabs()
     fill_extensions(prefabs, DATA_PATH, EXT_PREFAB);
 }
 
+char *str_replace_ext(const char *s, const char *newext) {
+    static char ret[256];
+
+    strncpy(ret, s, 256);
+    char *ext = strrchr(ret, '.');
+    strncpy(ext, newext, 10);
+
+    return ret;
+}
+
 FILE *path_open(const char *tag, const char *fmt, ...)
 {
     va_list args;