Get Next Line

Reading a line on a file descriptor is way too tedious

Normal Version

Description

• A function that reads a line from a file descriptor on each call.
• Behaviour is undefined when using this function on different file descriptors

Prototype

char	*get_next_line(int fd);

Usage

git clone https://github.com/Archer-01/get_next_line.git
cd get_next_line
touch main.c

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

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

	fd = open("file.txt", O_RDONLY);
	if (fd == -1)
	{
		fprintf(stderr, "Couldn't open file.txt");
		exit(EXIT_FAILURE);
	}

    line = get_next_line(fd);
	while (line != NULL)
	{
		printf("%s", line);
		free(line);
        line = get_next_line(fd);
	}
	return (0);
}

echo "Hello from file" > file.txt
echo "Bye from file" >> file.txt
gcc -D BUFFER_SIZE=42 get_next_line.c get_next_line_utils.c main.c
./a.out

Bonus version

Description

• Behaves just like the normal version but also handles multiple file descriptors at once (Up to 10240 file)

Prototype

char	*get_next_line(int fd);

Usage

git clone https://github.com/Archer-01/get_next_line.git
cd get_next_line
touch main.c

#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include "get_next_line_bonus.h"

int	main(void)
{
	int		fd1;
	int		fd2;
	char	*line;

	fd1 = open("file1.txt", O_RDONLY);
	fd2 = open("file2.txt", O_RDONLY);
	if (fd1 == -1)
	{
		fprintf(stderr, "Couldn't open file1.txt");
		exit(EXIT_FAILURE);
	}
	if (fd2 == -1)
	{
		fprintf(stderr, "Couldn't open file2.txt");
		exit(EXIT_FAILURE);
	}

    line = get_next_line(fd1);
    printf("%s", line);
    free(line);

    line = get_next_line(fd2);
    printf("%s", line);
    free(line);

    line = get_next_line(fd1);
    printf("%s", line);
    free(line);

    line = get_next_line(fd2);
    printf("%s", line);
    free(line);

	return (0);
}

echo "Hello from file 1" > file1.txt
echo "Another hello from file 1" >> file1.txt
echo "Hello from file 2" > file2.txt
echo "Another hello from file 2" >> file2.txt
gcc -D BUFFER_SIZE=42 get_next_line_bonus.c get_next_line_utils_bonus.c main.c
./a.out