ft_libft

Description

ft_libft is a project at 42 School (École 42) that involves creating a library of useful C functions. This library, named libft, contains implementations of various standard C library functions as well as additional utility functions. The purpose of this project is to gain a deeper understanding of programming concepts in C and to build a personal library that can be reused in future projects.

Installation

To use the libft library in your projects, follow these steps:

Clone the ft_libft repository: git clone https://github.com/abouabra/42-ft_libft.git
Navigate to the ft_libft directory: cd 42-ft_libft
Compile the library using the provided Makefile: make. This will generate the libft.a static library file.
Link libft.a to your project at compile time. You can do this by including the library in your compilation command or by adding it to your project's Makefile.

Usage

To use the functions provided by the libft library, include the libft.h header file in your source code:

Example

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

int main() {
    char *str = "Hello, world!";
    int len = ft_strlen(str);
    printf("Length of string: %d\n", len);
    return 0;
}

Compile your source code with the libft.a library:

gcc -o example example.c -L. -lft

Run the compiled program:

./example

The output should be:

Length of string: 13

Documentation

The libft library is organized into several categories of functions:

Part 1 - Libc Functions

These functions are implementations of standard C library functions:

Function	Description
ft_memset	Sets the first n bytes of the memory area pointed to by s to the specified value.
ft_bzero	Sets the first n bytes of the memory area pointed to by s to zero.
ft_memcpy	Copies n bytes from memory area src to memory area dest.
ft_memmove	Copies n bytes from memory area src to memory area dest, handling overlap correctly.
ft_memchr	Locates the first occurrence of c in the first n bytes of the memory area pointed to by s.
ft_memcmp	Compares the first n bytes of memory areas s1 and s2.
ft_strlen	Calculates the length of the string pointed to by s, excluding the terminating null byte.
ft_strlcpy	Copies up to size - 1 characters from the NULL-terminated string src to dst, NULL-terminating the result.
ft_strlcat	Appends the NULL-terminated string src to the end of dst. It will append at most size - strlen(dst) - 1 bytes, NULL-terminating the result.
ft_strchr	Locates the first occurrence of c in the string pointed to by s.
ft_strrchr	Locates the last occurrence of c in the string pointed to by s.
ft_strnstr	Locates the first occurrence of the NULL-terminated string needle in the string haystack, where not more than len characters are searched.
ft_strncmp	Compares at most the first n bytes of two strings s1 and s2.
ft_atoi	Converts the initial portion of the string pointed to by str to int representation.
ft_isalpha	Checks if the character c is an alphabetic character (a-z or A-Z).
ft_isdigit	Checks if the character c is a decimal digit (0-9).
ft_isalnum	Checks if the character c is alphanumeric (a-z, A-Z, or 0-9).
ft_isascii	Checks if the character c is a 7-bit ASCII character.
ft_isprint	Checks if the character c is a printable character (including space).
ft_toupper	Converts the character c to uppercase.
ft_tolower	Converts the character c to lowercase.
ft_calloc	Allocates memory for an array of nmemb elements of size bytes each and initializes the memory to zero.
ft_strdup	Duplicates the string pointed to by src, including the terminating null byte, using malloc.

Part 2 - Additional Functions

These functions are additional utility functions:

Function	Description
ft_substr	Allocates and returns a substring of the string s.
ft_strjoin	Concatenates two strings.
ft_strtrim	Allocates and returns a copy of the string s1 without the specified set of characters at the beginning and end.
ft_split	Splits a string into an array of strings using a delimiter.
ft_itoa	Converts an integer to a string.
ft_strmapi	Applies the function f to each character of the string passed as argument by giving its index as first argument to create a new string.
ft_putchar_fd	Outputs the character c to the given file descriptor.
ft_putstr_fd	Outputs the string s to the given file descriptor.
ft_putendl_fd	Outputs the string s to the given file descriptor, followed by a newline.
ft_putnbr_fd	Outputs the integer n to the given file descriptor.

Bonus Part

These functions are bonus functions:

these functions are using the following structure (linked list):

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

Function	Description
ft_lstnew	Allocates and returns a new element.
ft_lstadd_front	Adds the element new at the beginning of the list.
ft_lstsize	Counts the number of elements in a list.
ft_lstlast	Returns the last element of the list.
ft_lstadd_back	Adds the element new at the end of the list.
ft_lstdelone	Deletes and frees the given element.
ft_lstclear	Deletes and frees the given element and every successor of that element, using the function del and free(3).
ft_lstiter	Iterates the list lst and applies the function f to the content of each element.
ft_lstmap	Iterates the list lst and applies the function f to the content of each element. Creates a new list resulting of the successive applications of the function f.

Personal Functions

These are additional personal functions:

Function	Description
ft_printf	Implementation of printf function.
get_next_line	Reads a line from a file descriptor.

Final Note

If you have any suggestions or feedback, please feel free to open an issue or submit a pull request.

abouabra / 42-ft_libft