ejarvinen / 42Libft

A recode of C Standard Library functions

42Libft: My First C Library

Overview

Libft is a project that involves creating a custom C library containing a collection of essential functions that will be useful for future C programming assignments. By implementing these functions, I have gained a deeper understanding of standard C library functions and memory management.

Features

Mandatory Features

• Standard Library Implementations:
  • Reimplementation of standard libc functions (e.g., strlen, memset, strchr).
  • Functions for character classification (isalpha, isdigit, etc.).
  • Memory manipulation functions (memcpy, memmove, etc.).
• Additional Utility Functions:
  • String manipulation (ft_substr, ft_strjoin, ft_strtrim).
  • Number to string conversion (ft_itoa).
  • String iteration and transformation (ft_strmapi, ft_striteri).
  • File descriptor-based output (ft_putchar_fd, ft_putstr_fd, etc.).

Bonus Features

• Linked List Manipulation:
  • Creating and managing linked lists (ft_lstnew, ft_lstadd_front, etc.).
  • Iterating and modifying linked lists (ft_lstiter, ft_lstmap).
  • Clearing and freeing list nodes (ft_lstdelone, ft_lstclear).

Prerequisites

• C Compiler: Ensure a compatible compiler (e.g., gcc) is installed.
• Makefile: Provided for efficient compilation.

Setup and Usage

Installation

1. Clone this repository:

git clone https://github.com/ejarvinen/42Libft.git
cd 42Libft

2. Build the library (without bonus features):

make

3. OR build the library (with bonus features):

make bonus

Usage

To use libft.a in your project:

gcc -Wall -Wextra -Werror your_program.c -L. -lft -o your_program

Development Guidelines

• Norm Compliance: Follows the 42 coding norm.
• Memory Management: Properly frees all heap-allocated memory to avoid leaks.
• Error Handling:
  • Ensures functions return expected outputs.
  • Handle invalid inputs gracefully.

File Structure

• Makefile: Handles compilation and cleaning tasks.
• Source Files: Includes .c and .h files for implementation.
• Library Archive: libft.a for linking with other projects.

Example Usage

#include "libft.h"
#include <stdio.h>

int main() {
    char *str = ft_strdup("Hello, Libft!");
    printf("%s\n", str);
    free(str);
    return 0;
}