Libft

This project involves coding a C library that will include numerous general purpose functions for your programs.

📖 Description

Libft is the first project of the 42 Common Core. The goal is to create a personal C library that reimplements essential functions of the standard C library, as well as additional utility functions (string manipulation, memory handling, linked lists, etc.).

This library will serve as a foundation for future projects, helping to reduce reliance on built-in functions and strengthening understanding of how they work internally.

🛠️ Features

🔤 Character and String Manipulation

FUNCTIONS	DESCRIPTION
ft_strlen	calculates the length of a null-terminated string.
ft_strlcpy	copies a null-terminated string from the source to the destination, while ensuring that the destination buffer does not overflow.
ft_strlcat	appends a null-terminated string from the source to the destination, while ensuring that the destination buffer does not overflow.
ft_toupper	converts a given lowercase character to its corresponding uppercase representation.
ft_tolower	converts a given uppercase character to its corresponding lowercase representation.
ft_strchr	searches for the first occurrence of a specified character in a string.
ft_strrchr	searches for the last occurrence of a specified character in a string.
ft_strncmp	compares two strings up to a specified number of characters.
ft_strnstr	searches for a substring within a given string, but with a specified maximum length to search.
ft_strdup	duplicates a null-terminated string.
ft_substr	creates a new string that contains a portion of the original string starting at a specified index and with a specified length.
ft_strjoin	takes two parameters: pointers to the two strings to be concatenated.
ft_strtrim	removes specified characters from the beginning and end of a string.
ft_split	splits a string into an array of substrings based on a specified delimiter.
ft_atoi	converts a string representation of an integer into its corresponding integer value.
ft_itoa	converts an integer into a string.
ft_strmapi	applies a function to each character of a string, creating a new string with the modified characters.
ft_striteri	applies a function to each character of a string, with the index of the character passed as an argument to the function.

💾 Memory Manipulation

FUNCTIONS	DESCRIPTION
ft_bzero	sets a specified block of memory to zero by writing null bytes.
ft_memset	sets a specified number of bytes in a memory block to a given value.
ft_memcpy	copies a specified number of bytes from the source memory block to the destination memory block.
ft_memmove	copies a specified number of bytes from a source memory block to a destination memory block, handling overlapping memory regions correctly.
ft_memchr	searches for the first occurrence of a specified byte value in a memory block.
ft_memcmp	compares two memory blocks up to a specified number of bytes.
ft_calloc	allocates a block of memory for an array and initializes all the bytes to zero.

🖊️ File Descriptor Output

FUNCTIONS	DESCRIPTION
ft_putchar_fd	writes a character to a specified file descriptor.
ft_putstr_fd	writes a string to a specified file descriptor.
ft_putendl_fd	writes a string followed by a newline character to a specified file descriptor.
ft_putnbr_fd	writes an integer value to a specified file descriptor.

🔎 Character Checks

FUNCTIONS	DESCRIPTION
ft_isalpha	checks whether a given character is an alphabetic character. It determines if the character is either an uppercase letter (A-Z) or a lowercase letter (a-z).
ft_isdigit	checks if a given character is a digit (0-9).
ft_isalnum	checks whether a given character is alphanumeric, meaning it is either an alphabetic character (a-z, A-Z) or a digit (0-9).
ft_isascii	checks whether a given character is a valid ASCII character.
ft_isprint	checks if a given character is a printable character.

🔗 Linked List Functions

FUNCTIONS	DESCRIPTION
ft_lstnew	creates a new linked list node.
ft_lstadd_front	adds a new node at the beginning of a linked list.
ft_lstadd_back	adds a new node at the end of a linked list.
ft_lstsize	counts the number of elements in a linked list.
ft_lstlast	returns the last element of a linked list.
ft_lstdelone	deletes a single node from a linked list.
ft_lstclear	deletes and frees all the nodes in a linked list.
ft_lstiter	applies a function to each element of a linked list.
ft_lstmap	applies a function to each element of a linked list and creates a new list with the modified elements.

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📦 Installation

Clone the repository and compile the library.

git clone https://github.com/hanmpark/libft.git
cd libft
make

This will create libft.a, which you can link to your projects.

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🚀 Usage

To use libft in your project:

gcc main.c -L. -lft -I. -o my_program

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👤 Authors

• hanmpark