ft_printf – 42 Project

ft_printf is a custom implementation of the standard printf function in C.
This project is part of the common core at École 42, and aims to develop a deep understanding of variadic functions, formatted output, and low-level C programming.

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🎯 Project Objectives

• Recreate the behavior of the C standard printf function
• Handle variadic arguments with va_list
• Parse and process format specifiers
• Manage memory and edge cases without using the standard printf

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✅ Supported Format Specifiers

The following conversions are implemented:

Specifier	Description
%c	Character
%s	String
%p	Pointer address (hexadecimal)
%d	Signed decimal integer
%i	Signed decimal integer
%u	Unsigned decimal integer
%x	Unsigned hexadecimal (lowercase)
%X	Unsigned hexadecimal (uppercase)
%%	Literal percent sign

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⚙️ Compilation

To compile the library and run example programs:

make

You can include ft_printf.a in your own projects as follows:

#include "ft_printf.h"

Link it during compilation:

gcc main.c libftprintf.a

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📁 Project Structure

ft_printf/
│
├── ft_printf.c       # Entry point and dispatcher
├── utils/            # Helper functions (itoa, strlen, putchar, etc.)
├── conversions/      # Individual format specifier handling
├── ft_printf.h       # Header file
├── Makefile          # Build instructions
└── test/             # Optional test files

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🧪 Testing

You can test the function with various inputs:

ft_printf("Hello %s, number: %d\n", "world", 42);

You can also compare the output with the standard printf for consistency:

printf("Standard: %d\n", num);
ft_printf("Custom:   %d\n", num);

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📚 Useful References

• man 3 printf

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👤 Author

42 Login: hsilverb Contact: LinkedIn

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📝 License

This project is part of the 42 School curriculum.
For learning and academic use only.