🖨️ ft_printf

ft_printf is a custom implementation of the standard C printf function. This project is part of the core 42 curriculum and helps deepen understanding of variadic functions, formatted output, and low-level manipulation of data in C.

📚 Table of Contents

• Overview
• Features
• Installation
• Usage
• File Structure
• Subject Breakdown
• License
• Subject PDF

📖 Overview

The goal of this project is to recreate a simplified version of the C printf function, supporting various format specifiers and flags. It handles variable argument lists and formatted output using only standard system calls like write().

✨ Features

✅ Mandatory Supported Format Specifiers:

• %c : Character
• %s : String
• %p : Pointer address
• %d / %i : Signed integer
• %u : Unsigned decimal
• %x : Lowercase hexadecimal
• %X : Uppercase hexadecimal
• %% : A literal percent sign

⚙️ Installation

git clone https://github.com/adil-ech/ft_printf
cd ft_printf
make

This will create the libftprintf.a static library.

🚀 Usage

In your C program:

#include "ft_printf.h"

Compile with:

gcc main.c -L. -lftprintf

Ensure both libftprintf.a and ft_printf.h are available in your working directory.

📁 File Structure

ft_printf/
├── ft_printf.c        # Main logic
├── ft_utils.c         # Helper functions
├── ft_hex.c           # Hex conversion
├── ft_put.c           # Print utils
├── ft_ptr.c           # Pointer handling
├── Makefile
└── ft_printf.h        # Header file

📄 Subject Breakdown

✅ Part 1 — Core Implementation

Implement a simplified version of printf, using:

• va_list, va_start, va_arg, va_end for variadic arguments
• write() for all output
• Custom integer-to-string conversions
• Manual parsing of format strings

❌ Bonus Part — Not Implemented

This README only covers the mandatory part of the project. Bonus features like flags (-, 0), field width, and precision are not included.

📬 License

This project is part of the 42 Network curriculum and should be used for educational purposes only.

📄 Subject PDF

You can read the official 42 printf subject here: 👉 ft_printf Subject PDF