#pragma warning (disable:4996)
#include <stdio.h>
#include <malloc.h>
int main(int argc, char* argv[])
{
    char *a;
    int size = 1;
    a = malloc(size * sizeof(char));
    FILE* frog;
    if (argc > 2) {
        printf("ERROR: >2 args");
        return -1;
    }
    else if (argc == 2) {
        frog = freopen(argv[1], "r", stdin);
        if (frog == NULL) {
            printf("ERROR: can't open ur file bitch");
            return -1;
        }
    }

    do
    {
        a[size - 1] = (char)fgetc(stdin);
        ++size;
        a = realloc(a, size * sizeof(char));
        if (a[size - 2] == '\n')
        {
            printf(" == ");
        }
        printf("%c", a[size - 2]);
    } while (a[size - 2] != EOF); // пока не конец файла

    printf(" == ");
    if (argc == 2)
    {
        fclose(stdin);
    }
    free(a);
    return 0;
}