ft_printf

Reimplementation of printf in C using variadic arguments (va_list, va_start, va_arg).

Build

make

cc main.c -L. -lftprintf -o program

#include "ft_printf.h"

ft_printf("Hello, %s! You are %d years old.\n", name, age);
ft_printf("Pointer: %p\n", ptr);
ft_printf("Hex: %x / %X\n", 255, 255);  // ff / FF

How it works

The format string is scanned character by character. When % is found, the next character determines which conversion to apply. Each conversion writes directly to stdout via write(). Returns the total number of characters printed, same as the real printf.

Supported conversions

Specifier	Output
%c	Single character
%s	String ((null) if NULL)
%p	Pointer address (0x + lowercase hex)
%d / %i	Signed decimal integer
%u	Unsigned decimal integer
%x / %X	Hex lowercase / uppercase
%%	Literal %

Files

├── ft_printf.h           - prototypes
├── ft_printf.c           - main function + format parser
├── ft_printf_utils1.c    - %c, %s, %p
└── ft_printf_utils2.c    - %d, %i, %u, %x, %X