Libft

Libft is a custom C library developed as part of the 42 curriculum.
It reimplements standard C library functions and introduces additional utilities for memory management, string handling, and linked lists.
The goal is to strengthen understanding of low-level programming, pointers, and data structures by building a reusable toolkit from scratch.

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📚 Project Overview

• Language: C
• Output: libft.a (static library)
• Purpose: Provide a foundation of essential functions for use in future 42 projects
• Skills Learned:
  • Memory allocation and management
  • String and character manipulation
  • Linked list operations
  • Makefile usage and compilation
  • Debugging and testing

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🛠️ Contents

Libft includes implementations of:

• Libc functions
  Reimplementations of standard functions like:

  • strlen, strcpy, memcpy, atoi, isdigit, toupper, etc.

• Additional functions
  Helpers for string manipulation, memory handling, and conversions:

  • ft_substr, ft_strjoin, ft_split, ft_itoa, etc.

• Linked list utilities (Bonus part)
  Functions to create, traverse, and manipulate linked lists (t_list):

  • ft_lstnew, ft_lstadd_front, ft_lstmap, ft_lstclear, etc.

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⚙️ Compilation

To compile the library:

make

This will generate:

libft.a

Cleaning and rebuilding:

make clean     # Remove object files
make fclean    # Remove object files + libft.a
make re        # Rebuild everything

Usage

You can include libft in your C projects by linking the compiled library:

gcc main.c -L. -lft -o main

Or directly:

gcc main.c libft.a -o main

Include the header file in your source:

#include "libft.h"

Example:

#include "libft.h"
#include <stdio.h>

int main(void)
{
    char str[] = "Hello, Libft!";
    printf("Length: %zu\n", ft_strlen(str));
    return 0;
}

Project Structure

.
├── Makefile
├── libft.h
├── ft_*.c
└── libft.a

Features

• Memory: ft_memset, ft_bzero, ft_memcpy, ft_calloc, etc.
• Strings: ft_strlen, ft_strdup, ft_strjoin, ft_split, etc.
• Characters: ft_isalpha, ft_toupper, etc.
• Linked Lists: ft_lstnew, ft_lstadd_front, ft_lstmap, etc.

Author

RIDA SBAA 📧 rsbaa@student.1337.ma  GitHub Repository