// convert raw bits to signed decimal ascii numerals
//
// compile with:    g++ -std=c++0x numconv-32bit.c

#include <iostream>
using namespace std;
#include <unistd.h>             /* for read() */
#include <iomanip>

int main(int argc, char const ** argv){
  static_assert (sizeof(int) == 4, "sizeof(int) is not correct");
  union {int foo;  char bar[4];};
  foo = 0;
  bar[0] = -1;
  if (foo != 255) {
    cerr << "  Host machine is not little-endian" << endl;
    exit (1);
  }

  int fd(0);            // stdin

  char const * progname = *argv++; argc--;
  if (progname);
  int cols = 1;
  if (argc > 0) {
    cols = atoi(*argv++); argc--;
  }

  int buf[cols];

  for (;;) {
    int rslt = read(fd, buf, sizeof(buf));
    if (rslt <= 0) break;       // EoF or error (don't care which)
    for (int ii = 0; ii < cols; ii++) {
      cout << setw(12) << buf[ii] << ",";
    }
    cout << endl;
  }
}