This is the get_next_line project from the 42 Cursus.
The aim of this project is to implement a function that reads a file line by line.
Each call to get_next_line returns the next line from the file descriptor, including the newline character if present.

• get_next_line Functionality:
  • Reads from a file descriptor and returns one line at a time.
  • Handles partial reads and buffers the data between calls.
  • Returns NULL when there is no more data or on error.

• Multiple File Descriptors:
  • Supports reading from multiple file descriptors simultaneously.
  • Uses a static array of buffers (indexed by file descriptor) to manage multiple streams.

Include the header file in your project:

#include "get_next_line.h"

Use the function in your code as follows:

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

int main(void)
{
    int fd;
    char *line;

    fd = open("test_file.txt", O_RDONLY);
    if (fd < 0)
        return (1);
    while ((line = get_next_line(fd)) != NULL)
    {
        printf("%s", line);
        free(line);
    }
    close(fd);
    return (0);
}

Compile your program with the get_next _line files:

cc -Wall -Wextra -Werror main.c get_next_line.c get_next_line_utils.c 

For the bonus version (supporting multiple file descriptors), simply use get_next_line as usual (compiling with the *_bonus.c files). The implementation internally manages a static buffer for each file descriptor.

• Buffering:
  Data is read in chunks of BUFFER_SIZE bytes. The function manages an internal buffer to store the data between calls until a newline character is found. BUFFER_SIZE is 42 by default; you can redefine it at compile time.

  cc -Wall -Wextra -Werror -D BUFFER_SIZE=10 main.c get_next_line.c get_next_line_utils.c 

• Memory Management:
  The function dynamically allocates memory for each line it returns. It is the caller's responsibility to free the memory after usage.

• Edge Cases:

  • When the file descriptor is invalid or an error occurs, get_next_line returns NULL.
  • When reaching the end-of-file, any remaining data is returned as the last line.

This project is part of 42 School curriculum.