A small C library of essential and custom utility functions
📋 Table of Contents
- 📄 Description
- 🛠️ Technologies Used
- 🔑 Key Concepts
- 📁 Project Structure
- 📌 Mandatory Functions
- ✨ Bonus Functions
- ⚙️ How to Compile
- 🛠 How to Use
Libft is a custom C library containing reimplemented standard functions
from <ctype.h>, <string.h>, <stdlib.h>, plus additional utilities
and linked-list tools. It is the first project in the 42 curriculum
and teaches the fundamentals of memory management, string handling,
and data manipulation in C.
1.Memory Manipulation
2.Memory Management
3.Pointer arithmetic
4.String Manipulation
5.Function Pointers
6.File Descriptors
7.File Descriptors
8.Linked Lists DSA
9.Error Handling
├── Makefile
├── ft_atoi.c
├── ft_bzero.c
├── ft_calloc.c
├── ft_isalnum.c
├── ft_isalpha.c
├── ft_isascii.c
├── ft_isdigit.c
├── ft_isprint.c
├── ft_itoa.c
├── ft_lstadd_back_bonus.c
├── ft_lstadd_front_bonus.c
├── ft_lstclear_bonus.c
├── ft_lstdelone_bonus.c
├── ft_lstiter_bonus.c
├── ft_lstlast_bonus.c
├── ft_lstmap_bonus.c
├── ft_lstnew_bonus.c
├── ft_lstsize_bonus.c
├── ft_memchr.c
├── ft_memcmp.c
├── ft_memcpy.c
├── ft_memmove.c
├── ft_memset.c
├── ft_putchar_fd.c
├── ft_putendl_fd.c
├── ft_putnbr_fd.c
├── ft_putstr_fd.c
├── ft_split.c
├── ft_strchr.c
├── ft_strdup.c
├── ft_striteri.c
├── ft_strjoin.c
├── ft_strlcat.c
├── ft_strlcpy.c
├── ft_strlen.c
├── ft_strmapi.c
├── ft_strncmp.c
├── ft_strnstr.c
├── ft_strrchr.c
├── ft_strtrim.c
├── ft_substr.c
├── ft_tolower.c
├── ft_toupper.c
└── libft.h
| Family | Function | Description |
|---|---|---|
| Character | ft_isalpha | Checks if character is alphabetic |
| Character | ft_isdigit | Checks if character is a digit |
| Character | ft_isalnum | Checks if character is alphanumeric |
| Character | ft_isascii | Checks if character is ASCII |
| Character | ft_isprint | Checks if character is printable |
| Character | ft_toupper | Converts character to uppercase |
| Character | ft_tolower | Converts character to lowercase |
| Memory | ft_bzero | Sets n bytes of memory to zero |
| Memory | ft_calloc | Allocates memory and initializes it to zero |
| Memory | ft_memchr | Locates a byte in memory |
| Memory | ft_memcmp | Compares two memory areas |
| Memory | ft_memcpy | Copies n bytes from source to destination |
| Memory | ft_memmove | Copies memory safely even if areas overlap |
| Memory | ft_memset | Fills memory with a constant byte |
| String | ft_strlen | Returns the length of a string |
| String | ft_strlcpy | Copies a string into a buffer of given size |
| String | ft_strlcat | Concatenates strings into a buffer of given size |
| String | ft_strchr | Returns a pointer to the first occurrence of char |
| String | ft_strrchr | Returns a pointer to the last occurrence of char |
| String | ft_strncmp | Compares two strings up to n characters |
| String | ft_strnstr | Locates a substring in a string up to len characters |
| String | ft_strdup | Duplicates a string |
| String | ft_substr | Returns a substring from a string |
| String | ft_strjoin | Concatenates two strings into a new string |
| String | ft_strtrim | Trims characters from the start and end of a string |
| String | ft_split | Splits a string into an array of strings by delimiter |
| String | ft_strmapi | Applies a function to each character of a string |
| String | ft_striteri | Applies a function to each character with index |
| Conversion | ft_atoi | Converts a string to an integer |
| Conversion | ft_itoa | Converts an integer to a string |
| File Desc | ft_putchar_fd | Writes a character to a file descriptor |
| File Desc | ft_putstr_fd | Writes a string to a file descriptor |
| File Desc | ft_putendl_fd | Writes a string followed by newline to a descriptor |
| File Desc | ft_putnbr_fd | Writes an integer to a file descriptor |
| Family | Function | Description |
|---|---|---|
| Linked List | ft_lstnew_bonus | Creates a new list element |
| Linked List | ft_lstadd_front_bonus | Adds a new element at the beginning of the list |
| Linked List | ft_lstadd_back_bonus | Adds a new element at the end of the list |
| Linked List | ft_lstsize_bonus | Counts the number of elements in the list |
| Linked List | ft_lstlast_bonus | Returns the last element of the list |
| Linked List | ft_lstdelone_bonus | Deletes one element using a function |
| Linked List | ft_lstclear_bonus | Deletes and frees all elements of the list |
| Linked List | ft_lstiter_bonus | Iterates through the list and applies a function |
| Linked List | ft_lstmap_bonus | Applies a function to each element and creates a new list |
• Compile the library
make
# This generates:
# - libft.a : the static library
# - Object files (.o) for each source file
• Remove object files
make clean
• Remove object files and the library
make fclean
• Rebuild everything
make re
• Include the header
#include "libft.h"
• Compile your program with:
gcc -Wall -Wextra -Werror main.c -L. -lft -o my_program