get_next_line

📌 Project Description

The get_next_line project is designed to implement a function that reads a file line by line. The function should work with any file descriptor and must return each line, including the newline character (\n).

The function should:

• Read from a file descriptor (fd) one line at a time.
• Return NULL when there is nothing left to read or if an error occurs.
• Work with different BUFFER_SIZE values set at compile time.
• Handle both file input and standard input (stdin).
• Be implemented without using global variables or the lseek() function.

📁 Files

Mandatory Files

• get_next_line.c – Main function to read a line from a file descriptor.
• get_next_line_utils.c – Helper functions used in get_next_line.c.
• get_next_line.h – Header file containing function prototypes and necessary includes.

Bonus Files (Supports Multiple File Descriptors)

• get_next_line_bonus.c – Modified get_next_line to handle multiple file descriptors.
• get_next_line_utils_bonus.c – Helper functions for the bonus part.
• get_next_line_bonus.h – Header file for the bonus implementation.

🚀 Compilation

You can compile the project with different BUFFER_SIZE values using:

cc -Wall -Wextra -Werror -D BUFFER_SIZE=42 get_next_line.c get_next_line_utils.c -o gnl

For the bonus part:

cc -Wall -Wextra -Werror -D BUFFER_SIZE=42 get_next_line_bonus.c get_next_line_utils_bonus.c -o gnl_bonus

⚙️ Usage

To use the function in a test program:

#include <fcntl.h>
#include <stdio.h>
#include "get_next_line.h"

int main(void)
{
    int fd = open("test.txt", O_RDONLY);
    char *line;
    while ((line = get_next_line(fd)))
    {
        printf("%s", line);
        free(line);
    }
    close(fd);
    return 0;
}

🔍 Features

• Reads and returns one line at a time.
• Handles any BUFFER_SIZE value.
• Works with both files and standard input.
• The bonus version supports multiple file descriptors simultaneously.

📜 License

This project follows the 42 School project requirements and is meant for educational purposes.