mthulisindzombane / 42-libft

A recreation of many C stdlib functions, as well as some extras.

Libft - mhurd

Another implementation of several Standard C Library, plus some extras.

TOC

• What is libft?
• What's in it?
• How does it work?
• How do I use the library?
• Example usage

What is libft?

Libft is an individual project at 42 that requires us to re-create some standard C library functions including some additional ones that can be used later to build a library of useful functions for the rest of the program.

We re-create these functions in order to deepen our understanding of C. The general philosophy of 42 is that it's best to fully understand that machine that you're using and how it all works together. As a result, we avoid treating even these basic functions as black-boxes.

What's it do?

As you can see from the Project instructions, there are 4 sections:

1. Libc Functions: Some of the standard C functions
2. Additional functions: Functions 42 deems will be useful for later projects
3. Bonus Functions: Functions 42 deems will be useful for linked lists
4. Personal Functions: Functions I find useful.

Libc functions	Additional functions	Bonus Functions	Personal Functions
memset	ft_memalloc	ft_lstnew	ft_count_words
bzero	ft_memdel	ft_lstdelone	ft_print_memory
memcpy	ft_strnew	ft_lstdel	ft_islower
memccpy	ft_strdel	ft_lstadd	ft_isupper
memmove	ft_strclr	ft_lstiter	ft_strndup
memchr	ft_striter	ft_lstmap	ft_lst_add_back.c
memcmp	ft_striteri		ft_strcjoin.c
strlen	ft_strmap		ft_printjoin.c
strdup	ft_strmapi		ft_atof.c
strcpy	ft_strequ
strncpy	ft_strnequ
strcat	ft_strsub
strlcat	ft_strjoin
strchr	ft_strtrim
strrchr	ft_strsplit
strstr	ft_itoa
strnstr	ft_putchar
strcmp	ft_putstr
strncmp	ft_putendl
atoi	ft_putnbr
isalpha	ft_putchar_fd
isdigit	ft_putstr_fd
isalnum	ft_putendl_fd
isascii	ft_putnbr_fd
isprint
toupper
tolower

Notes:

• All the files and functions are namespaced with an ft_ in front. It stands for Fourty Two
• The project instructions require that we put all the source files in the root directory.

How does it work?

The goal is to create a library called libft.a from the source files so I can later use that library from other projects at 42.

To create that library, after downloading/cloning this project, cd into the project and call make:

git clone https://github.com/Matt-Hurd/42-libft
cd libft
make

You should see a libft.a file and some object files (.o).

Now to clean up (removing the .o files), call make clean

How do I use the library?

When compiling, you have to tell the file where your library resides and which library it is using:

gcc -L. -lft -o example.out example.c

-L takes the path to your library. . in this case
-l takes the name of your library. This is the set of characters that come after lib in your library name.

That's it. Now run it using ./example.out

Example usage

This is a list of my projects that use Libft extensively:

• get_next_line

How did you make this sick README?

It was heavily inspired by my friend R4meau.