get_next_line (mandatory&bonus)

📖 About

Mandatory part of 42’s get_next_line: read a file descriptor one line at a time. Returns a newly allocated string, or NULL on EOF/error. Bonus part of 42’s get_next_line: supports multiple FDs concurrently by keeping per-FD state.

Function prototype

char *get_next_line(int fd);

Build get_next_line library

Run 'make' to compile both mandatory get_next_line function or 'make bonus'. This would create a static library called libgnl.a or libgnl_bonus.a respectively. BUFFER_SIZE is possible to change during compilation process.

make
# or override:
make BUFFER_SIZE=4096

Usage example

Add as a header into your program

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

int main(void)
{
    int fd = open("Makefile", O_RDONLY);
    char *line;

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

Compile and run your program

cc main.c libgnl.a -o gnl_test
./gnl_test