#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/types.h>
#include <unistd.h>
#include <string.h>
#include <stdbool.h>
#define BUF_SIZE 1
#define enter "\n"


// gets 4 elements, filename ,in1, in2,out
int main(int argc, char* argv[])
{

    int input1_fd,input2_fd, output_fd,curfile = 1;
    char buffer[BUF_SIZE];
    bool flag = true ;

    /* Input and output file descriptors */
    /* Number of bytes returned by read() and write() */
    /* Character buffer */
    /* Are src and dest file name arguments missing */
    if(argc != 4)
    {
        printf ("arguments missing"); return 1;
    }

    /*Create input file descriptor*/
    input1_fd = open (argv[1],O_RDONLY);
    if (input1_fd == -1)
    {
      perror("open");
      return 2;
    }
    input1_fd = open (argv[2],O_RDONLY);
    if (input2_fd == -1)
    {
      perror("open");
      return 2;
    }

    /*Create output file descriptor*/

    output_fd = open (argv[3],O_WRONLY | O_CREAT,0644);
    if (output_fd == -1)
    {
      perror("open");
      return 3;
    }

    while(flag)
    {
            if(curfile == 1)
                read(input1_fd, buffer,1); // reads 1 char to buffer
            else
              {
                read(input2_fd, buffer,1);
                curfile = 2;
              }
            if(strcmp(buffer,enter)!=0) // checks if not enter
              write(output_fd,buffer,1); // writes to output
            else
              {
                write(output_fd,buffer,1); // writes to output
                //read(input2_fd, buffer,1) // reads 1 char to buffer
                curfile=2;
              }

            if (!(feof(stdin)))
                {
                    flag = false ;
                    printf("New text file generated");
                    close(input1_fd);
                    close(input2_fd);
                    close(output_fd);
                }
        //if(strcmp(buffer,EOF) == 0)
            //  flag = false ;
    }
return 0;
}