libft

Reimplementation of standard C library (libc) functions from scratch and additional useful functions for string manipulation, memory and linked lists into our own library.

Functions

Char

Function	Description
ft_isalpha	Check if character is alphabetic
ft_isdigit	Check if character is a digit
ft_isalnum	Check if character is alphanumeric
ft_isascii	Check if character is ASCII
ft_isprint	Check if character is printable
ft_toupper	Convert character to uppercase
ft_tolower	Convert character to lowercase

String

Function	Description
ft_strlen	Get string length
ft_strlcpy	Size-bounded string copy
ft_strlcat	Size-bounded string concatenation
ft_strchr	Locate character in string
ft_strrchr	Locate character in string (reverse)
ft_strncmp	Compare two strings (n bytes)
ft_strnstr	Locate substring in string
ft_strdup	Duplicate a string
ft_substr	Extract substring
ft_strjoin	Concatenate two strings
ft_strtrim	Trim characters from string
ft_split	Split string by delimiter
ft_strmapi	Apply function to each character
ft_striteri	Apply function to each character (index)

Memory

Function	Description
ft_memset	Fill memory with a constant byte
ft_bzero	Zero out memory
ft_memcpy	Copy memory area
ft_memmove	Move memory area
ft_memchr	Locate byte in memory
ft_memcmp	Compare memory areas
ft_calloc	Allocate and zero memory

Numbers

Function	Description
ft_atoi	Convert string to integer
ft_itoa	Convert integer to string

File descriptor

Function	Description
ft_putchar_fd	Write character to file descriptor
ft_putstr_fd	Write string to file descriptor
ft_putendl_fd	Write string with newline to fd
ft_putnbr_fd	Write integer to file descriptor

Linked lists (bonus)

Function	Description
ft_lstnew	Create new list node
ft_lstadd_front	Add node at front of list
ft_lstsize	Count nodes in list
ft_lstlast	Get last node
ft_lstadd_back	Add node at back of list
ft_lstdelone	Delete a node
ft_lstclear	Delete and free list
ft_lstiter	Iterate over list
ft_lstmap	Map function over list

Build

make          # build libft.a
make bonus    # build with bonus
make clean    # remove object files
make fclean   # remove object files and libft.a
make re       # fclean + make

Usage

Example:

// main.c
#include "libft.h"

int main(void)
{
    char *s = ft_strjoin("Hello, ", "world!");
    ft_putendl_fd(s, 1);
    free(s);
}

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