Libft - C Library Project

Libft is a custom C library that implements essential functions found in the standard C library, as well as additional utility functions useful for other C projects. This project is part of the 42 School curriculum and introduces the concepts of creating a static library, memory management, and adhering to strict coding standards.

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Table of Contents

1. Project Overview
2. Common Instructions
3. Part 1 - Libc Functions
4. Part 2 - Additional Functions
5. Bonus Part - Linked List Functions

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Project Overview

Program name: libft.a
Files: Makefile, libft.h, ft_*.c
Makefile Rules: NAME, all, clean, fclean, re, bonus
Objective: Write a collection of functions for a C library that will be useful across multiple projects.

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Common Instructions

• Language: The project must be written in C and adhere to the 42 School Norm.
• Memory Management: All allocated memory on the heap must be properly freed; no memory leaks are allowed.
• Makefile Requirements: The Makefile must compile with -Wall, -Wextra, and -Werror flags and should contain the specified rules. libtool is not allowed; use ar to create libft.a.

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Makefile Rules

• all: Compiles the library
• clean: Removes object files
• fclean: Removes object files and the library
• re: Recompiles everything from scratch
• bonus: Compiles additional functions in separate _bonus files

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Part 1 - Libc Functions

This section involves recreating several functions from the standard C library. Each function has the same behavior as the original, but the name is prefixed with ft_ (e.g., ft_strlen for strlen). These functions do not use external library calls unless stated otherwise.

List of Part 1 Functions

• Character Checks: ft_isalpha, ft_isdigit, ft_isalnum, ft_isascii, ft_isprint
• String Manipulation: ft_strlen, ft_strlcpy, ft_strlcat, ft_strchr, ft_strrchr, ft_strncmp, ft_strnstr
• Memory Manipulation: ft_memset, ft_bzero, ft_memcpy, ft_memmove, ft_memchr, ft_memcmp
• Character Conversion: ft_toupper, ft_tolower
• String to Integer: ft_atoi
• Memory Allocation: ft_calloc, ft_strdup

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Part 2 - Additional Functions

The following functions provide additional functionality not directly included in the C library. They are useful for string manipulation, memory allocation, and other utilities.

List of Part 2 Functions

• String Manipulation and Memory Allocation:

  • ft_substr: Creates a substring from a given string
  • ft_strjoin: Concatenates two strings into a new string
  • ft_strtrim: Trims specified characters from the beginning and end of a string
  • ft_split: Splits a string into an array based on a delimiter
  • ft_itoa: Converts an integer to a string
  • ft_strmapi: Creates a new string by applying a function to each character
  • ft_striteri: Applies a function to each character of a string by reference

• File Descriptor Functions:

  • ft_putchar_fd: Writes a character to a given file descriptor
  • ft_putstr_fd: Writes a string to a given file descriptor
  • ft_putendl_fd: Writes a string followed by a newline to a given file descriptor
  • ft_putnbr_fd: Writes an integer to a given file descriptor

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Bonus Part - Linked List Functions

If completed, the bonus section introduces functions to work with linked lists. Use the following structure for each node:

typedef struct s_list {
    void *content;
    struct s_list *next;
} t_list;