Libft — 42 C Library

Libft is the first mandatory project of 42 School. The goal is to create your own C Standard Library, replicate several libc functions, and implement extra utility functions that you will later reuse in other projects.

This version includes:

• All mandatory functions
• All bonus linked list functions

✨ Mandatory Functions

• Character checks (isalnum, isalpha, etc.)
• Memory manipulation (memcpy, memset, calloc…)
• String manipulation (strlen, strjoin, strtrim…)
• Conversion utilities (atoi, itoa)
• Output helpers (putchar_fd, putstr_fd…)

🧠 Bonus: Linked Lists 🪴

All list utilities using the t_list structure:

• ft_lstnew_bonus.c

• ft_lstadd_front_bonus.c

• ft_lstsize_bonus.c

• ft_lstlast_bonus.c

• ft_lstadd_back_bonus.c

• ft_lstdelone_bonus.c

• ft_lstclear_bonus.c

• ft_lstiter_bonus.c

• ft_lstmap_bonus.c

These help you build and manipulate singly linked lists easily.

⚙️ Usage

📚 Compile the library

make

This will generate:

libft.a

Clean object files

make clean

Clean + remove library

make fclean

Rebuild everything

make re

🧪 Example

main.c

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

int main(void)
{
    printf("%d\n", ft_isalpha('a'));
    printf("%zu\n", ft_strlen("Hello libft!"));
    return 0;
}

Compile:

cc main.c libft.a

💡 Why Libft is important

-Understand core C functions internally

-Learn memory management (stack/heap)

-Learn static libraries

-Improve code design & API structure

-Reuse functions in future projects: get_next_line, push_swap, minishell, fract-ol

👨‍💻 Author

Emanuel Tchipoque

🔗 LinkedIn: Emanuel Tchipoque