libft

A custom C standard-library implementation from the 42 curriculum, packaged as a static library (libft.a).

This project provides:

• Core character, string, memory, and conversion utilities.
• File-descriptor output helpers.
• Bonus singly linked-list helpers (t_list).

Project Layout

libft/
├── Makefile
├── libft.h
├── ft_*.c
└── ft_lst*_bonus.c

Build

Build the main library:

make

Build bonus objects and append them to the library:

make bonus

Clean objects:

make clean

Clean everything (objects + libft.a):

make fclean

Rebuild from scratch:

make re

Output

After make, you get:

• libft.a — static archive containing the compiled functions.

How to Use

1) Include the header

#include "libft.h"

2) Build with your project

cc -Wall -Wextra -Werror main.c libft.a -o app

Or link from parent directory:

cc -Wall -Wextra -Werror main.c -L./libft -lft -I./libft -o app

API Overview

Part 1 — libc-like and utility functions

Character checks / transforms

• ft_isalpha
• ft_isdigit
• ft_isalnum
• ft_isascii
• ft_isprint
• ft_toupper
• ft_tolower

String functions

• ft_strlen
• ft_strchr
• ft_strrchr
• ft_strncmp
• ft_strnstr
• ft_strdup
• ft_strlcpy
• ft_strlcat
• ft_substr
• ft_strjoin
• ft_strtrim
• ft_split
• ft_strmapi
• ft_striteri

Memory functions

• ft_memset
• ft_bzero
• ft_memcpy
• ft_memmove
• ft_memchr
• ft_memcmp
• ft_calloc

Conversions

• ft_atoi
• ft_itoa

File-descriptor output

• ft_putchar_fd
• ft_putstr_fd
• ft_putendl_fd
• ft_putnbr_fd

Bonus — linked list (t_list)

Defined in libft.h:

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

Implemented helpers:

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

Notes specific to this repository

• ft_lstmap_bonus.c exists but currently contains only a declaration (no function body).
• Makefile bonus sources (BSRC) currently do not include ft_lstmap_bonus.
• libft.h currently does not expose a ft_lstmap prototype.

So in its current state, ft_lstmap is not part of the usable API.

Minimal Example

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

int main(void)
{
	char **parts = ft_split("42-libft-project", '-');
	if (parts)
	{
		ft_putendl_fd(parts[0], 1); // 42
		ft_putendl_fd(parts[1], 1); // libft
		ft_putendl_fd(parts[2], 1); // project
	}
	return (0);
}

Compile example:

cc -Wall -Wextra -Werror main.c -L. -lft -I. -o demo