This project has been created as part of the 42 curriculum by kkomurat.

ft_printf

Description

ft_printf is a custom implementation of the C standard printf function.
The goal of this project is to understand variadic functions and formatted output by reimplementing printf from scratch.

Instructions

Compilation

make        # Compile the library (generates libftprintf.a)
make all    # Same as make (explicit target)
make clean  # Remove object files (.o)
make fclean # Remove object files and library (libftprintf.a)
make re     # Recompile everything from scratch

make and make all are equivalent. Running either will compile all source files and generate libftprintf.a.

Usage

To use the library in your project, link it at compile time:

cc main.c libftprintf.a -o my_program

And include the header in your source files:

#include "ft_printf.h"

Supported Conversions

Specifier	Description
%c	Prints a single character
%s	Prints a string (NULL is printed as (null))
%p	Prints a pointer address in hexadecimal (0x...)
%d	Prints a decimal integer
%i	Prints an integer
%u	Prints an unsigned decimal integer
%x	Prints a number in lowercase hexadecimal
%X	Prints a number in uppercase hexadecimal
%%	Prints a literal % character

Return Value

ft_printf returns the total number of characters printed, or -1 on error.

Resources

• 42 Subject PDF (ft_printf)
• Manual pages (man <function_name>)
• klibc vsnprintf.c source code
• cppreference.com - fprintf reference

AI Usage

AI was used for:

• Debugging issues
• Reviewing code structure
• Help with creating README

All code was written and tested manually.