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

libft

Custom C Standard Library Implementation

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Description

This project was created as part of the 42 curriculum. The goal is to build a custom C library called libft, providing reimplementations of standard C library functions alongside custom utility routines used in subsequent 42 projects.

The library consists of four main components:

1. Part 1 - Libc Functions: Reimplementations of standard C library functions (ft_strlen, ft_memset, ft_bzero, ft_memcpy, ft_memmove, ft_strlcpy, ft_strlcat, ft_toupper, ft_tolower, ft_strchr, ft_strrchr, ft_strncmp, ft_memchr, ft_memcmp, ft_strnstr, ft_atoi, ft_calloc, ft_strdup).
2. Part 2 - Additional Functions: Common string and utility functions (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).
3. Part 3 - Linked Lists: Singly linked list manipulation utilities (ft_lstnew, ft_lstadd_front, ft_lstsize, ft_lstlast, ft_lstadd_back, ft_lstdelone, ft_lstclear, ft_lstiter, ft_lstmap).
4. Part 4 - ft_printf: Integrated formatted output print engine.

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Instructions

Installation

Clone the repository:

git clone https://github.com/ali-alemami/libft.git
cd libft

Compilation

Compile the static archive libft.a using make:

make

Additional targets:

make clean   # Remove object files
make fclean  # Remove object files and libft.a
make re      # Rebuild from scratch

Usage

Include the header file in your C source and link libft.a:

#include "libft.h"

int main(void)
{
    ft_putstr_fd("Hello 42!\n", 1);
    return (0);
}

Compile with:

cc main.c -L. -lft -o my_program

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Resources

• Linux man pages (e.g. man 3 strlen, man 3 memset)
• C Programming: Makefiles by Barry Brown

AI Usage

AI tools were used for code review and syntax clarification regarding:

• Edge-case handling in memory operations (ft_memmove overlap detection).
• Makefile dependency rules and static library archiving (ar rcs).