Libft

A custom C standard library implementation built from scratch as part of the 42 curriculum.

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📌 What is this project?

Libft is a personal recreation of several standard C library functions, along with additional utility functions and a linked list implementation.

The goal is to understand how these core functions work internally by reimplementing them from scratch without using the original libc implementations.

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⚙️ Features

This library includes:

🔤 Standard libc functions

Rewritten versions of common C functions:

• Character checks: ft_isalpha, ft_isdigit, ft_isalnum, ft_isascii, ft_isprint
• String manipulation: ft_strlen, ft_strlcpy, ft_strlcat, ft_strdup, ft_strchr, ft_strrchr, ft_strncmp, ft_strnstr
• Memory functions: ft_memset, ft_bzero, ft_memcpy, ft_memmove, ft_memchr, ft_memcmp
• Conversion: ft_atoi, ft_itoa
• Case conversion: ft_toupper, ft_tolower
• Allocation: ft_calloc

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🧰 Utility functions

Helpful additional functions:

• ft_substr

• ft_strjoin

• ft_strtrim

• ft_split

• ft_strmapi

• ft_striteri

• File descriptors helpers:

  • ft_putchar_fd
  • ft_putstr_fd
  • ft_putendl_fd
  • ft_putnbr_fd

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🔗 Bonus: Linked List

A simple linked list implementation:

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

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🛠️ Build

Compile the library using:

make

This generates:

libft.a

To remove object files:

make clean

To remove everything:

make fclean

To rebuild:

make re

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📦 Usage

Include the header in your project:

#include "libft.h"

Compile your program with the library:

gcc main.c -L. -lft

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📁 Project structure

libft/
├── srcs/
├── obj/
├── libft.h
├── Makefile
└── libft.a

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🎯 Purpose

This project is part of the 42 School curriculum and serves as a foundation for future projects such as:

• get_next_line
• ft_printf
• minishell

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👤 Author

• 42 Login: iarefeva

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📜 License

This project is for educational purposes as part of 42 School training.