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

ft_printf

Description

ft_printf is a custom C library that mimics the behavior of the standard printf() function that handles formatted output for multiple data types. This implementation is not expected to replicate the internal buffer management and handle some other specifiers.

This subject reinforces:

• Variable argument handling (va_start, va_arg, va_copy, va_end)
• System write calls
• Modular function declarations

Implemented Features

Supported Specifiers

This function supports the following conversion specifiers:

Conversion	Description
%c	Prints a single character
%s	Prints a string
%p	Prints a pointer in hexadecimal format
%d, %i	Prints a signed decimal integer
%u	Prints an unsigned decimal integer
%x	Prints a number in hexadecimal (lowercase)
%X	Prints a number in hexadecimal (uppercase)
%%	Prints a literal percent sign

Formatting Options (Bonus)

Options comply with this generalized pattern:

%[flags][width][.precision]specifier

[width]: Specifies the minimum number of characters to output

[.precision]: For integer types, sets the minimum number of digits printed; for the string type, sets the maximum number of characters printed.

The following are the flags:

Flags	Description
-	Align to the left
0	Pad numeric output with zeros
#	Add base prefix for the hexadecimal values
+	Always print sign for numbers
(space)	Print space for positive numbers

Instructions

Compilation

To compile the library, run:

make

This will generate the libftprintf.a static library.

Usage

To use ft_printf in your projects, include the header:

#include "includes/ft_printf.h"

and link the library during compilation:

gcc main.c -L. -lftprintf

Cleaning

To clean object files:

make clean

To clean everything, including the library:

make fclean

To recompile:

make re

Bonus

To compile bonus object files:

make bonus

Example Usage

#include "ft_printf.h"

int main(void)
{
    ft_printf("Hello %s, number: %d, hex: %x\n", "world", 42, 255);
    return 0;
}

Resources

• printf reference
• Variadic functions
• File descriptors

AI Usage

AI tools were used to:

• Create unit tests and inform about edge cases.
• Provide explanations for complex C concepts.
• Educate about real world uses of the functions that this library implements.

No AI was used to generate the library code directly; all functions were personally implemented but assistively tested.