Libft – Your Very First Own Library 🧱

This project is part of the École 42 curriculum, and consists of implementing your own C library containing several commonly used libc functions and other utilities, including singly linked list manipulation.

🧠 Purpose

The goal of this project is to develop a deep understanding of standard C functions by reimplementing them manually. It also provides a solid foundation for future projects by creating a reusable and reliable library.

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📁 Project Structure

📌 Part 1 – Libc Functions

Reimplementation of classic libc functions, with the ft_ prefix, including:

• Character and string: ft_isalpha, ft_isdigit, ft_strlen, ft_strncmp, ft_strchr, ft_strrchr, etc.
• Memory manipulation: ft_memset, ft_memcpy, ft_bzero, ft_memmove, ft_memchr, ft_memcmp
• Conversion and case: ft_toupper, ft_tolower, ft_atoi
• Allocation and duplication: ft_calloc, ft_strdup

📌 Part 2 – Additional Functions

Useful functions not directly available in libc:

• ft_substr
• ft_strjoin
• ft_strtrim
• ft_split
• ft_itoa
• ft_strmapi
• ft_striteri
• ft_putchar_fd
• ft_putstr_fd
• ft_putendl_fd
• ft_putnbr_fd

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⭐ Bonus – Linked Lists

Implementation of a set of functions to handle singly linked lists using the t_list structure:

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typedef struct s_list
{
    void            *content;
    struct s_list   *next;
} t_list;

Implemented functions:

• ft_lstnew
• ft_lstadd_front
• ft_lstsize
• ft_lstlast
• ft_lstadd_back
• ft_lstdelone
• ft_lstclear
• ft_lstiter
• ft_lstmap

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🔧 Compilation

The library is compiled with:

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make

To compile the bonus part:

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make bonus

Other available commands:

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make clean   # Removes object files (.o)
make fclean  # Removes object files and the libft.a file
make re      # Runs fclean and then make

Compilation follows the strict flags:

-Wall -Wextra -Werror

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🛠️ Rules and Constraints

• All files are located at the root of the repository.
• No external functions were used (except the allowed ones).
• No global variables were used.
• All functions follow the Norminette coding standard.
• The project was tested for leaks and failures.

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✅ Status

✔️ Project successfully completed, including the bonus part.

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📚 References

• Man pages: man strlen, man memcpy, etc.
• BSD libc vs glibc (exploration for functions such as strlcpy and strlcat)