This project has been created as part of the 42 curriculum by adede.

libft

Description

This libft project is the first part of the 42 cursus and recreates a set of standard C library functions, as well as some additional utility functions. The goal is to understand C programming, memory management, string manipulation and simple linked list structuring.

This library serves as a collection of useful functions that can hopefully be reused in future projects.

Library Overview

This library includes:

• Character checks and conversions: ft_isalpha, ft_isdigit, ft_toupper, ft_tolower, etc.
• Memory functions: ft_memset, ft_memcpy, ft_memmove, ft_calloc, etc.
• String functions: ft_strlen, ft_strlcpy, ft_strlcat, ft_strdup, ft_split, etc.
• Linked list functions: ft_lstnew, ft_lstadd_back, ft_lstlast, ft_lstclear, ft_lstmap, etc.

This library is written in C and compiled as a static library libft.a that can be included in other projects.

Instructions

Compilation

To compile the library, run:

make

This will generate the libft.a static library.

Usage

To use libft in your projects, include the header:

#include "libft.h"

and link the library during compilation:

gcc main.c -L. -lft

Cleaning

To clean object files:

make clean

To clean everything, including the library:

make fclean

To recompile:

make re

Full Feature List

This libft library includes some standard C functions and additional utilities, categorized below:

Type Conversions

• ft_atoi — converts a string to an integer
• ft_itoa — converts an integer to a string

Memory Management

• ft_memset — fills memory with a constant byte
• ft_memcpy — copies memory area
• ft_memmove — copies memory area safely with overlap
• ft_memchr — locates a byte in memory
• ft_memcmp — compares two memory areas
• ft_bzero — sets memory to zero
• ft_calloc — allocates memory and initializes it to zero

Character Checks & Conversions

• 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 an ASCII character
• ft_isprint — checks if character is printable
• ft_toupper — converts character to uppercase
• ft_tolower — converts character to lowercase

String Manipulation

• ft_strlen — calculates string length
• ft_strlcpy — copies a string safely
• ft_strlcat — concatenates strings safely
• ft_strchr — locates first occurrence of a character in string
• ft_strrchr — locates last occurrence of a character in string
• ft_strncmp — compares two strings up to n characters
• ft_strnstr — locates a substring in a string
• ft_strdup — duplicates a string
• ft_substr — extracts a substring from a string
• ft_strjoin — joins two strings
• ft_strtrim — trims characters from the beginning and end of a string
• ft_split — splits a string into an array of strings
• ft_strmapi — applies a function to each character of a string to create a new string
• ft_striteri — applies a function to each character of a string in-place

File Descriptors Output

• ft_putchar_fd — outputs a character to a file descriptor
• ft_putstr_fd — outputs a string to a file descriptor
• ft_putendl_fd — outputs a string followed by a newline to a file descriptor
• ft_putnbr_fd — outputs an integer to a file descriptor

Linked List Functions

• ft_lstnew — creates a new list element
• ft_lstsize — counts the number of elements in a list
• ft_lstlast — returns the last element of the list
• ft_lstadd_front — adds an element at the beginning of the list
• ft_lstadd_back — adds an element at the end of the list
• ft_lstdelone — deletes one element of the list
• ft_lstclear — deletes and frees the entire list
• ft_lstiter — applies a function to each element of the list
• ft_lstmap — creates a new list by applying a function to each element of the original list

Resources

• Creating static library with ar
• ASCII reference
• size_t and SIZE_MAX
• File descriptors
• Makefile
• Markdown cheat sheet

AI Usage

AI tools were used to:

• Create unit tests and inform about edge cases.
• Provide explanations for complex C concepts.
• Educate about real world uses of the functions that this library implements.

No AI was used to generate the library code directly; all functions were personally implemented but assistively tested.