#include <iostream>     // so I don't have to do lo level io everywhere.
#include <iomanip>

#include <unistd.h>     // close, and in general
#include <sys/types.h>  //read
#include <sys/stat.h>   //read
#include <fcntl.h>      //read
#include <stdio.h>      // perror

#include <climits>

using namespace std;

const char * filename = "scratch";

int main(int argc, char * argv[] ) {

    int fd;
    unsigned char x;
    int byte,i;

    for(i=1;i < argc; i++) {

        fd = open(argv[i], O_RDONLY);
	if (-1 == fd) {
	    perror("Could not open file");
	    cout << "\t" << argv[i] << endl;

	} else {
            // the name of the file.
	    cout << "File " << argv[i] << endl;
            byte = 0;

	    // process all bytes in the file.
	    while(read(fd, &x, 1)) {
	       cout << setw(8) << byte << ": " << setw(3) << int(x);
	       // print the character if it is printable.
	       if (isprint(x)) {
	          cout << " " << x;
	       }
	       cout << endl;
	       byte ++;
	    }

	    close(fd);
	}
	// a blank line after each file
	cout << endl;
    }

    return 0;
}