#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>

void read_file ( FILE * file ) {
    char *  line = NULL;
    size_t  len  = 0;
    ssize_t bytes_read;
    while ( ( bytes_read = getline ( &line, &len, file ) ) != -1 ) {
        printf ( "%s", line );
    }
    free ( line );
}
int main ( void ) {
    FILE *  file = fopen ( "/etc/fstab", "r" );
    read_file ( file );
    fclose ( file );
    return 0;
}