get_next_line.c

# include <unistd.h>
# include <stdlib.h>
# include <strings.h>
# include <fcntl.h>
# include <stdio.h>
# define BUFFER_SIZE 5

char	*get_next_line(int fd)
{
	char	a[999999];
	char	buffer[1];
	char	*new_a;
	int		i;
 
	if (fd < 0 && BUFFER_SIZE <= 0)
		return (NULL);
	i = 0;
	a[i] = 0;
	while (read(fd, buffer, 1) == 1)
	{
		a[i] = buffer[0];
		a[i + 1] = '\0';
		if (a[i] == '\n')
			break;
		i++;
	}
	if (!a[0])
		return (NULL);
	new_a = malloc(i + 1);
	if (!new_a)
		return (NULL);
	i = 0;
	while (a[i])
	{
		new_a[i] = a[i];
		i++;
	}
	new_a[i] = '\0';
	return (new_a);
}

//questo main serve per testare la funzione da soli ma non è necessario per l'esame vero e proprio

int main(int ac, char **av)
{
	int		fd;
	char	*line;
	(void)ac;

	fd = open(av[1], O_RDONLY);
    while ((line = get_next_line(fd)) != 0)
	{
		printf("%s", line);
		free(line);
	}
	close(fd);
	system("leaks a.out");
	return (0);
}