磁盘文件操作

已在磁盘上划分一定空间文件filesys.dat来模拟真实磁盘，现在要在该模拟磁盘中建立文件creatfile(),删除文件del(),创建目录md(),删除目录rd(),文件修改内容并保存edit(),上下级目录访问cd(),cd..(),cd\\(),文件复制copy(),这些函数怎么写啊？请大家帮帮忙！写好后可发到邮箱jsj5219@163.com



部分代码：-disk file operations are classified in a certain disk space filesys.dat paper to simulate real magnetic disk, it is now in the simulated disk established creatfile document (), delete the file del (), md build directory (), delete directory rd (), document and preserve the revision edit (), Thus directory cd (), ..(), cd cd \\ (), copy the copy () how to write these functions ah? Please help out! Not long after the mail jsj5219@163.com part of the code :