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// =======================================
// C++Wrapper around popen
// -----------------------
//   Alex Vinokur
//     mailto:alexvn@go.to
//     http://go.to/alexvn
// -----------------------
//   2002-10-22
// =======================================


// ==============================================
// Windows 2000 Professional
// MinGW 2.0.0.-2
// gcc/g++ version 3.2 (mingw special 20020817-1)
// ==============================================


// ================
#include <stdio.h>
#include <assert.h>
#include <errno.h>

#include <iostream>
#include <string>
#include <vector>

using namespace std;

// =====================================
#define FATAL_MSG(msg) \
        cout << msg \
             << " : " \
             << (strerror (errno)) \
             << " [ " \
             << __FILE__ \
             << ", #" \
             << __LINE__ \
             << " ]" \
             << endl

#define ERROR_MSG(msg) \
        cout << msg \
             << " : " \
             << " [ " \
             << __FILE__ \
             << ", #" \
             << __LINE__ \
             << " ]" \
             << endl


// =====================================
bool popen_cplusplus (
                const string&   command_i,
                vector<string>& result_o
                )
{
bool            ret_boolValue = true;
FILE*           fp;
const int       SIZEBUF = 1234;
char            buf [SIZEBUF];

  // ================================
  result_o = vector<string> ();
  // ================================

  if ((fp = popen(command_i.c_str (), "r")) == NULL)
  {
    FATAL_MSG ("Files or processes cannot be created");
    ret_boolValue = false;
    return ret_boolValue;
  }

  // ================================
string  cur_string;
  while (fgets(buf, sizeof (buf), fp))
  {
    cur_string = buf;
    if (cur_string [cur_string.size () - 1] != '\n')
    {
      ERROR_MSG ("SIZEBUF too small (" << SIZEBUF << ")");
      ret_boolValue = false;
      return ret_boolValue;
    }
    assert (cur_string [cur_string.size () - 1] == '\n');
    result_o.push_back (cur_string.substr (0, cur_string.size () - 1));
  }

  // ================================
  if (pclose(fp) == -1)
  {
    FATAL_MSG ("Cannot execute pclose");
    ret_boolValue = false;
  }

  return ret_boolValue;

} // bool popen_cplusplus (...)

// ==========================
int main ()
{
string          command;
vector<string>  result;

  // ====================================
  command = "ls -l C:\\WINNT";
  cout << endl;
  cout << endl;
  cout << "\t### Command line : " << command << " ###" << endl;
  if (!popen_cplusplus (command, result))
  {
    cout << "Cannot execute popen_cplusplus" << endl;
    return 1;
  }

  for (int i = 0; i < result.size (); i++)
  {
    cout << "[" << i << "]\t : " << result [i] << endl;
  }
  result.clear();

 // ====================================
  command = "help";
  cout << endl;
  cout << endl;
  cout << "\t### Command line : " << command << " ###" << endl;
  if (!popen_cplusplus (command, result))
  {
    cout << "Cannot execute popen_cplusplus" << endl;
    return 1;
  }

  for (int i = 0; i < result.size (); i++)
  {
    cout << "[" << i << "]\t : " << result [i] << endl;
  }
  result.clear();

  // ======
  return 0;
}