ft_printf

A complete custom implementation of the C standard printf function for 42 School. Supports all mandatory format specifiers (c s p d i u x X %) and uses a modular helper system. No bonus formatting included.

🔥 ft_printf — 42 Project

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📘 Overview

ft_printf is a custom re-implementation of the standard C function printf.

It prints formatted output to stdout using:

• write()
• variadic arguments (va_list, va_start, va_arg, va_end)
• internal helper functions

It is a mandatory 42 core project and is widely reused in future projects.

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✔️ Supported Format Specifiers

Format	Meaning
%c	Character
%s	String
%p	Pointer address
%d	Integer (signed)
%i	Integer (signed)
%u	Unsigned integer
%x	Hexadecimal (lowercase)
%X	Hexadecimal (uppercase)
%%	Literal % symbol

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📁 Project Structure

📦 ft_printf/ ├── ft_printf.c ├── ft_helpers.c ├── ft_helpers1.c ├── ft_printf.h ├── Makefile └── README.md

• ft_printf.c — main dispatcher and parsing logic
• ft_helpers.c & ft_helpers1.c — conversion & printing utilities
• ft_printf.h — prototypes, includes, typedefs

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⚙️ Compilation

Build the static library:

make

This will create:

libftprintf.a

Remove object files:

make clean

Remove object files + library:

make fclean

Rebuild from scratch:

make re

🧪 Example Usage

#include "ft_printf.h"

int main(void)
{
    ft_printf("Hello %s! Number: %d Hex: %x\n", "World", 42, 42);
    return 0;
}

Compile with your library:

cc main.c libftprintf.a

💡 Key Concepts

• Variadic arguments (stdarg.h)

• Manual formatting without libc formatting

• Direct output using write()

• Type dispatching and conversion

• No dynamic memory required (except strings if implemented)

🚫 Not Included (as required)

❌ Width ❌ Precision ❌ Flags (-, 0, #, +, space) ❌ Bonus formatting

🧑‍💻 Author

Emanuel Tchipoque

🔗 LinkedIn: Emanuel Tchipoque