Tasks List¶

1. Writing welcome and help messages¶

Program launch garda ke dekhincha r kasari use garne information.

You will look at different command line programs to draw inspiration and techniques from and can be as creative as you can with the messages.

2. Validation logic and error messages¶

Galat option r command diyo bhane error dini texts.

You will look at various popular command line applications and learn about how they give error messages. How to guide user to use the program correctly and so on.

Note

After Task 1 and 2,

You get familiarity of project codebase and how to contribute
improve familiarity of command line application and how they operate

3. Reading text file¶

Simple text file read garne function.

C Concepts Used¶

fopen, fclose, fread
Loops

4. Writing out text file¶

Simple text file write out garne function.

C Concepts Used¶

fopen, fclose, fread, fwrite
Loops

Note

You probably already have done 3 and 4. Choosing this task will mean you wil integrate that code into the project which includes polishing and editing the code to fit into the uniformity of rest of project. You may have to learn and switch to standard fwrite and fread function if you havent already.

5. Writing a logger setup¶

It is similar to debugging using printf function. What we do is basically add printf statements in the parts of code to make sure every things is running correctly and write the state of program in a separate file.

You will have to write a funtion similar to printf that will write to a file called debug.log whenever we call this function.

If anything goes wrong in our program, we can view this file and instantly know what our program was doing and where it failed. This is called logging and it helps in debugging our code.

C Concepts Used¶

fopen, fclose, fread, fwrite
Loops
structs (optionally)

Note

This task is extended version of read and writing files. If you want to strenthen your file handling skills this is a perfect fit.

6. Write Makefile¶

Currently Assigned

Pradip

Program compile and build logic.

You will develop custom “compile and run” function availabel in code editors and know what really goes when building an exe file out of a C source file.

Why tho?

For command line application like ours and in real world project management scenarios there are custom designed tools to build exe out fo source files. MakeFile will give us more power, customizability and understading. Eg. making compiler strict, enabling/disabling certain features, giving better warning and error message, switching C versions, customizing output exe name etc.

7. Parsing out the cli arguments to struct¶

User le deko command and option yeuta struct ma organize garne. You will get list of string and classify them as commands and options.

You will have to what options and commands the program offers the users with. Know how they are presented as a message to the users.

C Concepts Used¶

Struct
string functions
functions and return values

Extra Concepts¶

Basic knowledge of Command line programs
Basic knowledge of designing error handling and validation

8. Core encryption logic¶

Text r key file ko content lini r encrypted text nikalni function.

C Concepts Used¶

Arrays
Binary operators
String functions
Extensive use of functions

Extra Concepts¶

Researching and building out from theory
Cyber security and mathematical understadings

Currently Assigned

Ashwin

Choosing this tasks will mean you have to co-ordinate with Ashwin. You will learn about the implementation and theory first and then implement some of functions used in encrypting text files like permutation and xor operations.

Sample Code Layout¶

// ... c headers


int main(//......){
	 // Recieve input as commands from terminal
	 struct Command command = parse_user_input()


	 //if no commands Greet the user and give him instructions
	 greet_with_about_and_help()

	 // if User says a wrong command give hime usage errors
	 validate_input_struct()

	 // Write our own key array
	 int *keys = {};

	 // Read text file
	 get_encrypted_text(file)

	 // ENcrypt 
	 get_encrypted_text(text, key)

	 // write out the encrypted text
	 get_encrypted_text(text, key)


	 // if use says so launch interactive mode
	 interactive_propmt_loop()
}