This project was made for the Operating Systems class lectured by the Dr. Rafael Sachetto Oliveira in 2019/1 period of the Computing Science at the Federal University of São João del-Rei.
The main goal of this project was to implement the 16-bit FAT and a basic shell to navigate through file system.
The whole FAT file system should be contained in a single file named fat.part.
The specification of the FAT is:
- 512 bytes by sector
- 1024 bytes cluster
- 4096 clusters
Therefore, this FAT occupies (whether it does have anything stored or not) a raw data size of 4.194.304 (2 * 1024 * 4096) bytes (4 MiB).
The commands implemented in the shell are:
| Command | Effect |
|---|---|
| init | Initialize the file system (creates the fat.part file) or resets it. |
| load | Load the FAT table (only) to the program memory. |
| ls [PATH/DIR] | List the DIR directory. If DIR is a file or doesn't exists at all, an error message is shown. |
| mkdir [PATH/DIR] | Creates a directory with DIR name, if any of the PATH parts are not existant, the program creates it. If the DIR directory already exists (either as a file or a directory), an error message is shown. |
| create [PATH/FILE] | Creates a file with FILE name, if FILE already exists (either as a file or a directory), an error message is shown. |
| unlink [PATH/FILE] | Deletes a file or a directory with FILE name. If FILE does not exists, an error message is shown. |
| write "STRING" [PATH/FILE] | Writes (overwriting) STRING in the FILE file. If FILE does not exists as a file or is a directory, an error message is shown. |
| append "STRING" [PATH/FILE] | Writes (appending) STRING in the FILE file. If FILE does not exists as a file or is a directory, an error message is shown. |
| read [PATH/FILE] | Prints in the standard output the contents of the FILE file. If FILE does not exists as a file or is a directory, an error message is shown. |
In order to compile this program (considering that you have the make tool installed), just type in your terminal:
$ make
And to run the FAT program:
$ ./fat