LIBFT

Your very first own library

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🗣 About

This project is about coding a C library. It will contain a lot of general purpose functions your programs will rely upon. It is your very first project as a student at 42. You will need to recode a few functions of the C standard library as well as some other utility functions that you will use during your whole cursus.

🛠 Usage

Requirements

The library is written in C language and thus needs the gcc compiler and some standard C libraries to run.

Instructions

1. Compiling the library

To compile the library, run:

$ cd path/to/libft && make

2. Using it in your code

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

#include "libft.h"

3. Link your program with libft.a

LIBFT_DIR = path/to/libft
LIBFT = $(LIBFT_DIR)/libft.a

$(NAME): $(LIBFT)
	gcc $(LIBFT) $(MY_SRCS)...

$(LIBFT):
	make -C $(LIBFT_DIR)

💬 Description

string

Function	Description
ft_strlen	Computes the length of the string ’s’. (not protected)
ft_strlcpy	Copies ’src’ to ’dst’
ft_strlcat	Concatenates ’src’ to ’dst’
ft_strchr	Locates the first occurrence of the character ’c’ in the string ’s’
ft_strrchr	Locates the last occurrence of the character ’c’ in the string ’s’
ft_strcmp	Compares the two strings ’s1’ and ’s2’
ft_strncmp	Compares ’n’ characters of the two strings ’s1’ and ’s2’
ft_strncpy	Copies at most ’len’ characters from ’src’ to ’dst’
ft_strnstr	Locates the first occurrence of ’needle’ in ’haystack’, within ’len’ characters
ft_strdup	Allocates a copy of ’s1’
ft_substr	Allocates a sub-string from the string ’s’
ft_strjoin	Allocates new string, which is the result of the concatenation of ’s1’ and ’s2’
ft_strtrim	Allocates a copy of ’s1’ with all characters specified in ’set’ removed from the beginning and the end of the string.
ft_split	Splits ’s’ using the character ’c’ as a delimiter
ft_strmapi	Applies the function ’f’ to each character of ’s’, returning new string
ft_striteri	Applies the function ’f’ on each character of ’s’

memory

Function	Description
ft_calloc	Allocates space for ’count’ elements that are ’size’ bytes of memory, filled with zeroed bytes.
ft_memset	Writes ’len’ bytes of value ’c’ to the array ’b’
ft_bzero	Writes ’n’ zeroed bytes to the string ’s’
ft_memcpy	Copies ’n’ bytes from memory area ’src’ to memory area ’dst’
ft_memmove	Copies ’len’ bytes from string ’src’ to string ’dst’ (non-destructive manner)
ft_memchr	Searches for the first occurence of ’c’ in ’s’ within ’n’ bytes
ft_memcmp	Compares byte string ’s1’ against byte string ’s2’

print

Function	Description
ft_putchar_fd	Outputs the character ’c’ to the given file descriptor ’fd’
ft_putstr_fd	Outputs the string ’s’ to the given file descriptor ’fd’
ft_putendl_fd	Outputs the string ’s’ to the given file descriptor ’fd’ followed by a newline
ft_putnbr_fd	Outputs the integer ’n’ to the given file descriptor ’fd’

convert

Function	Description
ft_toupper	Converts a lower-case letter to the corresponding upper-case letter
ft_tolower	Converts a upper-case letter to the corresponding lower-case letter
ft_atoi	Converts the initial portion of ’str’ to int representation
ft_itoa	Converts the integer ’n’ to string representation

check

Function	Description
ft_isalpha	Checks character for an alphabetic character
ft_isdigit	Checks character for a digit
ft_isalnum	Checks character for an alhabetic character or digit
ft_isprint	Checks character for a printable character
ft_isascii	Checks character for an ascii character

linked list (bonus)

Function	Description
ft_lstnew	Allocates and returns a new node
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	Frees the memory of the node’s content using the function ’del’ given as a parameter and free the node
ft_lstclear	Deletes and frees the given node and every successor of that node, using the function ’del’ and free
ft_lstiter	Iterates the list ’lst’ and applies the function ’f’ on the content of each node
ft_lstmap	Creates a new list resulting of the successive applications of the function ’f’