mkm-editor

How to compile and run:

Simply run make

First Test - File Read / Writing Function

Ran

make
echo -e "alpha\nbeta\r\ngamma" > read.txt
./build/mkm read.txt

and it gave me first the 200 bytes of the file sucessfully.

malloc allocates memory and returns a pointer to it. On calloc the memory is not initialized. fseek used for setting the file pointer at the specific position in the file. ftell used to obtain the current file position of a stream.

Second Test - Counting Lines

Added --number flag for mkm, which displays the number of lines in the given file.

printf "file has one line" > ol.txt
./build/mkm --number ol.txt

Expected output: 1: file has one line

printf "\n" > twoblanklines.txt
./build/mkm --number twoblanklines.txt

Expected output:

1: 
2: 

Combined 13 decimal (0x0D) and 10 decimal (0x0A) which is CR and LF, they are used to mark a line break in a text file.

Third Test - Terminal I/O Function

./build/mkm --demo

to enter on demo.

• BRKINT: disable SIGINT on break condition.
• ICRNL: don't translate CR to NL.
• INPCK: parity checking off.
• ISTRIP: don't strip 8th bit (keep bytes intact).
• IXON: disable XON/XOFF software flow control.
• OPOST: disable post-processing; "\n" will NOT become "\r\n".
• CS8: set 8-bit chars.
• ECHO: stop echoing typed keys.
• ICANON: non-canonical mode (no line buffering).
• IEXTEN: turn off implementation-defined special controls (e.g., Ctrl-V).
• ISIG: turn off signals from INTR, QUIT, SUSP.

ANSI Escape Codes Cheat Sheet

Sequence	Description	Notes / Example
\x1b[2J	Clear entire screen	Often followed by \x1b[H to move cursor home.
\x1b[H	Move cursor to row 1, column 1	Use \x1b[row;colH for specific coordinates.
\x1b[s / \x1b[u	Save / restore cursor position	Restores last saved spot.
\x1b[nA	Move cursor up n rows	B = down, C = right, D = left.
\x1b[?25l / \x1b[?25h	Hide / show cursor	Useful for full-screen UIs.
\x1b[K	Clear to end of line	\x1b[1K clears to start; \x1b[2K entire line.
\x1b[0m	Reset all attributes	Always reset after styling.
\x1b[1m	Bold / bright text	\x1b[2m dim, \x1b[3m italic, \x1b[4m underline.
\x1b[30–37m	Set foreground color (basic)	30 black … 37 white; add 60 for bright variants (90–97).
\x1b[40–47m	Set background color (basic)	40–47 normal, 100–107 bright.
\x1b[38;5;Nm	Set 256-color foreground	N 0–255 palette; background uses 48;5;N.
\x1b[38;2;R;G;Bm	Truecolor foreground	Background 48;2;R;G;B.
\x1b]0;title\x07	Set terminal window title	BEL (\x07) terminates the OSC sequence.
\x1b[?1049h / \x1b[?1049l	Enter / exit alternate screen buffer	Keeps main screen intact while full-screen UI runs.

Prefix every sequence with the escape byte (\x1b or \033); wrap styled text like \x1b[1;31mHello\x1b[0m.