📚 Libft — My First C Library

"Building the foundation for all future C projects!"

Welcome to Libft, a custom C library project where I've reimplemented standard functions and created additional utilities as my first major programming project at 42.

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🎯 Project Objectives

• Deep understanding of standard C library functions by reimplementing them from scratch
• Practice memory management, pointer manipulation, and string operations
• Create a personal toolbox of functions for future C projects
• Master the art of clean, efficient, and well-organized code

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📋 What's Inside

🧩 Part 1: Libc Functions

Reimplementations of classic C library functions:

Function	Description
ft_isalpha	Checks if character is alphabetic
ft_isdigit	Checks if character is a digit
ft_isalnum	Checks if character is alphanumeric
ft_isascii	Checks if character is in ASCII table
ft_isprint	Checks if character is printable
ft_strlen	Calculates string length
ft_memset	Fills memory with a constant byte
ft_bzero	Zeros a memory area
ft_memcpy	Copies memory area
ft_memmove	Copies memory area with overlap handling
ft_strlcpy	Size-bounded string copying
ft_strlcat	Size-bounded string concatenation
ft_toupper	Converts character to uppercase
ft_tolower	Converts character to lowercase
ft_strchr	Locates first occurrence of character in string
ft_strrchr	Locates last occurrence of character in string
ft_strncmp	Compares two strings up to n bytes
ft_memchr	Locates byte in memory area
ft_memcmp	Compares memory areas
ft_strnstr	Locates substring in a string with length limit
ft_atoi	Converts string to integer
ft_calloc	Allocates and zeros memory
ft_strdup	Duplicates a string

🔧 Part 2: Additional Functions

Useful utilities not found in libc:

Function	Description
ft_substr	Extracts a substring from a string
ft_strjoin	Concatenates two strings
ft_strtrim	Trims specified characters from string
ft_split	Splits string using delimiter character
ft_itoa	Converts integer to string
ft_strmapi	Applies function to each character of string
ft_striteri	Applies function to each character with index
ft_putchar_fd	Outputs character to file descriptor
ft_putstr_fd	Outputs string to file descriptor
ft_putendl_fd	Outputs string with newline to file descriptor
ft_putnbr_fd	Outputs integer to file descriptor

✨ Bonus: Linked List Functions

Tools for creating and manipulating linked lists:

Function	Description
ft_lstnew	Creates new list node
ft_lstadd_front	Adds node to beginning of list
ft_lstsize	Counts nodes in list
ft_lstlast	Returns last node of list
ft_lstadd_back	Adds node to end of list
ft_lstdelone	Deletes node content and frees node
ft_lstclear	Deletes and frees entire list
ft_lstiter	Applies function to content of each node
ft_lstmap	Creates new list from applying function to original list

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🛠️ How to Use

# Build the library
make

# Clean up object files
make clean

# Remove all generated files
make fclean

# Rebuild everything
make re

Include in your projects:

#include "libft.h"

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💡 Key Learnings

• Proper memory allocation and management
• String manipulation techniques
• Function pointers and their applications
• Linked list implementation and operations
• Creating maintainable, modular code

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All functions follow the 42 Norm and are memory-leak free! 🧹