FILE SYSTEM IMPLEMENTATION - FINAL VERSION

Apart from the requirements for version 1, the complete version
includes

void delete(name)
   delete a file

void makedirectory(name)
   create a subdirectory

readbytes(FILE *, int numberofbytes, pointer)
   able to read any number of bytes requested

writebytes(FILE *, int numberofbytes, pointer)

listdirectory(name)
   print a listing of the contents of any directory

To support subdirectories, the names of files given to delete,
makedirectory, listdirectory, open, and create should be whole
paths such as "tests/project1/file2.txt" or "tests:project1:file2.txt"
etc (you can decide on the exact appearance). That way you don't
have to worry about keeping track of a current directory and
dealing with cd and ..


Implement the basic parts of your file system in
C++ or C, or if you're feeling brave, the assembly
language and emulator used for the worm.

The implementation should be in the form of a
library of useful functions that can be included
in other programs.

You should provide functions with the following
functionalities, but they don't need to have exactly
these names, parameters, or return types.

void startup() 
    get everything ready for use, you can expect all users
    to call this function before using any of the others

FILE * open(name)
    open a file for reading

FILE * create(name)
    open a file for writing

close(FILE *)
    obvious

read512(FILE *, pointer)
    read the next whole block from the file into memory

write512(FILE *, pointer)
    write a whole block to the end of the file

listroot()
    print a listing of the contents of the root directory

format(....)
    (re)format a disc, making it as new.

No need for directories (apart from a root directory) or
anything fancy for this version. You don't even need to
have full support for very large files yet.