///
//  main.c
//  ht01_04
//
//  Created by Артем Барышев on 19.09.2018.
//  Copyright © 2018 Артем Барышев. All rights reserved.
//

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>

char *getline2(FILE *f) {
    char now;
    char *new_string = malloc(sizeof(now));
    if (new_string == NULL) {
        return NULL;
    }
    size_t size = 0, real_size = 1;
    while ((now = getc_unlocked(f)) != EOF) {
        if (size == real_size) {
            real_size *= 2;
            new_string = realloc(new_string, sizeof(now) * real_size);
            if (new_string == NULL) {
                return NULL;
            }
        }
        new_string[size] = now;
        size++;
        if (now == '\n') {
            break;
        }
    }
    if (size == 0) {
        return NULL;
    }
    if (size == real_size) {
        real_size++;
        new_string = realloc(new_string, sizeof(now) * real_size);
        if (new_string == NULL) {
            return NULL;
        }
    }
    new_string[size++] = '\0';
    new_string = realloc(new_string, sizeof(now) * size);
    return new_string;
}