So what's all this about? 🖥️

Caesar is a C-library for encoding and decoding English text using the classic Caesar cipher! 😎

Currently the library uses a 3-character shift, meaning a becomes d & so on

Read more below for the full details...

How does Caesar work?

As of now, the Caesar library uses:

• Casting
• Modular Arithmetic
• File I/O

Function Descriptions

Refer to caesar.h and caesar.c

char text_cipher(const char c, unsigned int shift) Takes an ascii character and encodes it into caesar cipher by shifting it 'shift' positions in the ascii chracter line.
Ex. text_cipher('a', 3) returns 'd'.
Special cases: newline '\n', space ' ' and double-quotes '"' are not converted.

char cipher_text(const char c, unsigned int shift) Takes an ascii character (in caesar cipher) and shifts it back by 'shift' positions in the ascii line.
Ex. cipher_text('d', 3) returns 'a'.
Special cases: same as text_cipher

void encode_line(char *src, unsigned int shift) Takes a string of ascii characters and shifts all of them by 'shift' positions.
Ex. "Julius Caesar" becomes "Mxolxv Fdhvdu" with a shift of 3.

void decode_line(char *src, unsigned int shift) Takes a string of caesar cipher text and shifts every character inside by 'shift' positions.
Ex. "Mxolxv Fdhvdu" becomes "Julius Caesar" with a shift of 3.

unsigned int encode_to_file(char *dest, char *src, unsigned int max_len, unsigned int shift) Reads lines from src and translates them into caesar cipher (shifting by 'shift' characters), assuming each line in src is no more than max_len characters long.
Returns:

• 0: if the max_len value was less than 1.
• 1: if one of the files could not be opened (or did not exist).
• 2: if there was a malloc failure.

unsigned int decode_to_file(char *dest, char *src, unsigned int max_len, unsigned int shift) Reads lines from src and shifts their characters back by 'shift' positions, assuming each line in src is no more than max_len characters long.
Returns:

• 0: if the max_len value was less than 1.
• 1: if one of the files could not be opened (or did not exist).
• 2: if there was a malloc failure.

Check it out!

Download the repo. Use the Makefile in the Terminal: run 'make main', then run './main'.
For source file use "text.txt" and for target file use "cipher.txt". For max no. of characters use 52, and for shift try 3.
Enjoy! 🎉