hi

#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
int main(int argc, char **argv)
{
    int fd;
    ssize_t bytesRead;
    uint8_t buf[1024];
    size_t count[sizeof(buf)];
    int closed;
    ssize_t written;

    if(argc == 1 ) //no arguments ->read from stdin and write to stdout
    {
      while(read(STDIN_FILENO, buf, 1) != 0)
      {
        write(STDOUT_FILENO, buf, 1);
      }
        exit(0);
    }
    else
    {
        for (int i = 1; i < argc; ++i) //for each argument:
       {
         fd =  open(argv[i], O_RDONLY); //open file
          if (fd == -1)                 //check error
          {
            perror(argv[i]);
            exit(errno);
          }
          else
 {
            while((bytesRead = read(fd, buf, *buf)) != 0) //read file to the end "0"
              {
                  if(bytesRead == -1)     //error checking
                  {
                   perror(argv[i]);
                   exit(errno);
                  }
                  else
                  {
                    count[i] = bytesRead;    //count number of bytes in file
                    written = write(STDOUT_FILENO, buf, count[i]); //print out file contents
                      if(written == -1)       //error checking
                       {
                        perror(argv[i]);
                        exit(errno);
                       }
                  }

              }

          }
        closed = close(fd);       //close file descriptor
               if(closed == -1)
                {
                  perror(argv[i]);
                  exit(errno);
                }
       }
     }

return 0;
}
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