mateusmedeir / libft

This project consists of creating some of the most used functions in the C language and others exclusive to it.

Libft - 42

My very first own library

📑 About

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This project consists of creating our own library with some of the most used functions in the C language and others that are exclusive to it. It will be very useful, since we will use it in our next projects in C.

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Part 1 - Libc functions

Name	Description
ft_isalpha	checks if it is an alphabetic character
ft_isdigit	checks if it is a decimal digit character
ft_isalnum	checks if it is an alphanumeric character
ft_isascii	checks if it is an ASCII character
ft_isprint	checks if it is a printable character
ft_strlen	returns the length of the string
ft_memset	fill the first len bytes of b with c
ft_bzero	erase n bytes of s with zeros
ft_memcpy	copy n bytes from src to dst (the memory areas must not overlap)
ft_memmove	copy len bytes from src to dst (The memory areas may overlap)
ft_strlcpy	copy dstsize - 1 characters from src to dst, ending with NULL
ft_strlcat	append the dstsize - ft_strlen(dst) - 1 characters from src to dst, ending with NULL
ft_toupper	convert lowercase letters to uppercase
ft_tolower	convert uppercase letters to lowercase
ft_strchr	returns a pointer to the first occurrence of the character c in the string s
ft_strrchr	returns a pointer to the last occurrence of the character c in the string s
ft_strncmp	compare the first n characters of strings s1 and s2 and return 0 if they are equal, otherwise return the difference between them
ft_memchr	return a pointer to the first instance of c in s until n bytes or NULL if the character does not occur in the given memory area
ft_memcmp	compare the first n characters of the memory areas s1 and s2 and return 0 if they are equal, otherwise return the difference between them
ft_strnstr	copies the string src, including the terminating null byte, to the buffer dest
ft_atoi	convert string str to int
ft_calloc	allocate unused space for an array of countelements each of whose size in bytes is size. The space shall be initialized to all bits 0
ft_strdup	returns a pointer to a new string which is a duplicate of the string s

Part 2 - Additional functions

Name	Description
ft_substr	returns a substring from the string s. The substring begins at index start and is of maximum size len
ft_strjoin	returns a new string, which is the result of the concatenation of s1 and s2
ft_strtrim	returns a copy of s1 with the characters specified in set removed from the beginning and the end of the string
ft_split	returns an array of strings obtained by splitting s using the character c as a delimiter. The array must end with a NULL pointer
ft_itoa	returns a string representing the integer received as an argument
ft_strmapi	Applies the function f to each character of the string s, and passing its index as first argument to create a new string resulting from successive applications of f
ft_striteri	Applies the function f on each character of the string passed as argument, passing its index as first argument. Each character is passed by address to f to be modified if necessary
ft_putchar_fd	Outputs the character c to the given file descriptor
ft_putstr_fd	Outputs the string s to the given file descriptor
ft_putendl_fd	Outputs the string s to the given file descriptor followed by a newline
ft_putnbr_fd	Outputs the integer n to the given file descriptor

Bonus functions

Name	Description
ft_lstnew	returns a new node. The member variable content is initialized with the value of the parameter content. The variable next is initialized to NULL
ft_lstadd_front	Adds the node new at the beginning of the list
ft_lstsize	Counts the number of nodes in a list
ft_lstlast	Returns the last node of the list
ft_lstadd_back	Adds the node new at the end of the list
ft_lstdelone	Takes as a parameter a node and frees the memory of the node’s content using the function del given as a parameter and free the node. The memory of next must not be freed
ft_lstclear	Deletes and frees the given node and every successor of that node, using the function del and free. Finally, the pointer to the list must be set to NULL
ft_lstiter	Iterates the list lst and applies the function f on the content of each node
ft_lstmap	Iterates the list lst and applies the function f on the content of each node. Creates a new list resulting of the successive applications of the function f. The del function is used to delete the content of a node if needed

⚙️ Usage

Instructions

1. Compiling the library

Inside the repository, run:

make

2. Using it in your code

To use the library functions in your code, include the header:

#include "libft.h"

and, when compiling your code, use the following flags:

-Lpath/to/libft.a -lft

Makefile

Command	Description
make	compile the library
make bonus	compile the library with the bonus
make clean	delete all object files
make fclean	delete all object files and the library
make re	recompile the library