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

#define ELEMENTE    10

int main(int argc, char* argv[])
{
	int p[2];
	int pid;
	int i;

	if( -1 == pipe(p) )
	{
		perror("failed to create pipes");
		return -1;
	}

	pid = fork();
	if(pid == -1)
	{
		perror("failed to create child process");
		return -1;
	}

	if(pid)
	{
		int suma = 0;
		char c;
		close(p[1]);

		while (read(p[0], c, 1))
			suma += c;

		printf("suma caracterelor cifra din fisier este: %d\n", suma);

		close(p[0]);
	}
	else
	{
		int file = fopen("input.txt", "r");
		int size;
		char *buffer;

		close(p[0]);
		fseek(file, 0, SEEK_END);
		size = ftell(file);
		buffer = (char*)malloc(size+1);
		memset(buffer, 0, size+1);
		fread(buffer, 1, size, file);
		fclose(file);

		for (i=0;buffer[i]!=0;i++)
		{
			char c = buffer[i];
			if ((c >= '0') && (c <= '9'))
			{
				c = c - '0';
				write(p[1], &c, 1);
			}
		}

		free(buffer);

		close(p[1]);
	}

	return 0;
}