ft_printf

A simplified version of printf from libc

Prints a string in at the standard output and returns the number of printed characters. You can include the following datatypes.

Supported Data types	Syntax
Integers	%i %d
Unsigned integers	%u
Unsigned integers in hexadecimal in lowercase	%x
Unsigned integers in hexadecimal in uppercase	%X
Characters	%c
Strings	%s
Pointer directions	%p
%	%%

• This version of printf does not support flags
• Neither handles buffering

Installation

git clone https://github.com/chriss1245/printf.git

make -C printf

Usage

Inside your files

#include "printf/inc/ft_printf.h"

ft_printf("Hello world %d", 1);

When compiling

gcc your_files.c printf/libftprintf.a

How it works

It uses a data type va_list which can handle an arbitrary amount of arguments inside a funciton. That way we can recieve in our function a string and an arbitrary amount of arguments.

Inside it runs a loop which writes a character in the standard output. If the character to be writen is a % it runs a helper function which determines which type of data is going to be printed and then calls the corresponding funciton.

Headerfile

There are primitive functions required by ft_printf. These funcitons are available an can be used importing the ft_printf.h.

Primitive funcitons

Function	Description
put_number	Writes an integer in the standard output
put_unsigned_number	Writes an unsigned integer in the standard outpu
put_string	Writes an string in the standard output
put_char	Writes a character in the standard output
put_hex	Writes an hexadecimal number in the standar output (in lowercase if 'a' is passed or in uppercase if 'A' is passed)
put_ptr	Writes a pointer direction in lowercase in the standard output