Libft - 42 Project

Libft is a custom C library that replicates key functions from the standard C library. It includes implementations of various functions (for example, strlen, strcpy, memset, and malloc), focusing on string manipulation, memory management, and linked lists. This project is designed to build a deeper understanding of how these fundamental functions work behind the scenes.

Functions from <ctype.h>

• ft_isalpha - checks for an alphabetic character.
• ft_isdigit - checks for a digit (0 through 9).
• ft_isalnum - checks for an alphanumeric character.
• ft_isascii - checks whether c fits into the ASCII character set.
• ft_isprint - checks for any printable character.
• ft_toupper - converts a char to uppercase.
• ft_tolower - converts a char to lowercase.

Functions from <string.h>

• ft_memset - fill memory with a constant byte.
• ft_strlen - calculate the length of a string.
• ft_bzero - zero a byte string.
• ft_memcpy - copy memory area.
• ft_memmove - copy memory area.
• ft_strlcpy - copy string to an specific size.
• ft_strlcat - concatenate string to an specific size.
• ft_strchr - locate character in string.
• ft_strrchr - locate character in string.
• ft_strncmp - compare two strings.
• ft_memchr - scan memory for a character.
• ft_memcmp - compare memory areas.
• ft_strnstr - locate a substring in a string.
• ft_strdup - creates a duplicate for the string passed as parameter.

Functions from <stdlib.h>

• ft_atoi - convert a string to an integer.
• ft_calloc - allocates memory and sets its bytes' values to 0.

Non-standard functions

• ft_substr - returns a substring from a string.
• ft_strjoin - concatenates two strings.
• ft_strtrim - trims the beginning and end of string with specific set of chars.
• ft_split - splits a string using a char as parameter.
• ft_itoa - converts a number into a string.
• ft_strmapi - applies a function to each character of a string.
• ft_striteri - applies a function to each character of a string.
• ft_putchar_fd - output a char to a file descriptor.
• ft_putstr_fd - output a string to a file descriptor.
• ft_putendl_fd - output a string to a file descriptor, followed by a new line.
• ft_putnbr_fd - output a number to a file descriptor.

Linked list functions

• ft_lstnew - creates a new list element.
• ft_lstadd_front - adds an element at the beginning of a list.
• ft_lstsize - counts the number of elements in a list.
• ft_lstlast - returns the last element of the list.
• ft_lstadd_back - adds an element at the end of a list.
• ft_lstclear - deletes and free list.
• ft_lstiter - applies a function to each element of a list.
• ft_lstmap - applies a function to each element of a list.