struct buf { unsigned char *pnt; long size; long pos; struct buf *next; struct buf *prev; }; struct framebuf { struct buf *buf; long pos; struct frame *next; struct frame *prev; }; あれ？ typedef struct mpstr_tag { ＜略＞ struct frame fr; …

煮詰まったので、こんな時は人様のコードをカンニング。:-)