#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>

int main(void)
{
    int filedes[2];
    pid_t pid;
    char c;
    int status;
    int r, i, k = 0;
    char buf[32];

    if (pipe(filedes) < 0)
    {
        fprintf(stderr, "Eroare la crearea pipe-ului.\n");
        exit(EXIT_FAILURE);
    }

    if ((pid = fork()) < 0)
    {
        fprintf(stderr, "Eroare la crearea copilului.\n");
        exit(EXIT_FAILURE);
    }

    if (pid == 0)
    {
        if (close(filedes[0]) == -1)
            exit(EXIT_FAILURE);

        int fd;

        if ((fd = open("file.txt", O_RDONLY)) == -1)
            exit(EXIT_FAILURE);

        while ((r = read(fd, buf, sizeof (buf))))
            write(filedes[1], buf, r);

        if (close(fd) == -1)
            exit(EXIT_FAILURE);

        if (close(filedes[1]) == -1)
            exit(EXIT_FAILURE);

        exit(0);
    }
    else
    {
        if (close(filedes[1]) == -1)
            exit(EXIT_FAILURE);

        while ((r = read(filedes[0], buf, sizeof (buf))))
        {
            for (i = 0; i < r; i++)
                if (buf[i] >= '0' && buf[i] <= '9')
                    k ++;
        }

        printf("%d\n", k);

        if (close(filedes[0]) == -1)
            exit(EXIT_FAILURE);

        exit(0);
    }

    wait(&status);
    return 0;
}