printf ≽^-⩊-^≼

I built this project to understand what really happens behind a simple printf call ^~^.
Instead of relying on the standard library, this is my own implementation that handles formatted output from scratch -parsing the format string-, reading variable arguments, and printing everything manually.

This project helped me get comfortable with:

-variadic functions (va_list)
-parsing strings character by character
-handling different data types in a unified way
-writing cleaner and more modular C code

What It Supports

%c → characters.
%s → strings.
%p → pointers.
%d / %i → integers.
%u → unsigned integers.
%x / %X → hexadecimal.
%% → literal %

How It Works

The function scans the format string one character at a time.
If it's a normal character → print it directly
If it sees % → switch to parsing mode
Based on the specifier → fetch the correct argument using va_arg
Convert it (if needed) → print it
Everything is built around small helper functions to keep things clean and reusable.

build

make

example

ft_printf("Hello %s\n", "world");
ft_printf("Value: %d\n", 42);
ft_printf("Pointer: %p\n", ptr);

sample output

Hello world
Value: 42
Pointer: 0x7ffee4bff5c8