This project has been created as part of the 42 curriculum by esalman.

Description

Libft is a foundational project of the 42 curriculum. The goal is to recreate a personal C library by reimplementing commonly used standard C library functions, as well as additional utility functions and basic linked list operations.

This project helps build a deep understanding of memory management, pointers, strings, and data structures in C. The resulting static library, libft.a, is designed to be reused in future 42 projects.

Library Overview

The library includes:

Part 1 – Libc Functions

Reimplementations of standard libc functions, such as:

• Character checks (ft_isalpha, ft_isdigit, ...)
• String operations (ft_strlen, ft_strchr, ft_strncmp, ...)
• Memory manipulation (ft_memset, ft_memcpy, ft_memmove, ...)
• Conversion and allocation (ft_atoi, ft_calloc, ft_strdup)

Part 2 – Additional Functions

Utility functions not directly available in libc, including:

• String manipulation (ft_substr, ft_strjoin, ft_strtrim, ft_split)
• Conversions (ft_itoa)
• Functional string operations (ft_strmapi, ft_striteri)
• File descriptor output functions (ft_putchar_fd, ft_putstr_fd, ft_putendl_fd, ft_putnbr_fd)

Part 3 – Linked List Functions

Basic singly linked list utilities using the t_list structure:

• Node creation and insertion (ft_lstnew, ft_lstadd_front, ft_lstadd_back)
• List inspection (ft_lstsize, ft_lstlast)
• Memory management (ft_lstdelone, ft_lstclear)

Instructions

Compilation

To compile the library, simply run:

make

This will generate the static library libft.a at the root of the repository.

Makefile Rules

The Makefile supports the following rules:

• make or make all – compile the library
• make clean – remove object files
• make fclean – remove object files and libft.a
• make re – rebuild everything

The project is compiled using:

• Compiler: cc
• Flags: -Wall -Wextra -Werror

Usage

Include the header and link the library in your project:

#include "libft.h"

cc your_program.c -L. -lft

AI Usage

AI tools were used only as a learning aid, specifically for:

• Understanding concepts and function behavior
• Clarifying edge cases
• Writing example test cases
• Organizing Readme.md

AI was not used to generate or write any source code in this project.

This usage fully complies with the 42 AI guidelines and focuses on reinforcing understanding rather than providing solutions.

Resources

• man pages (e.g., man strlen, man memcpy)
• 42 Intranet Libft subject PDF
• Youtube

Notes

• All files are written in accordance with the 42 Norm.
• No global variables are used.
• All dynamically allocated memory is properly freed when required.
• The library is built using ar as required by the subject.

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This project serves as a strong foundation for future C programming projects within the 42 curriculum.