// Filename: executionEnvironment.cxx
// Created by:  drose (15May00)
//
////////////////////////////////////////////////////////////////////
//
// PANDA 3D SOFTWARE
// Copyright (c) 2001, Disney Enterprises, Inc.  All rights reserved
//
// All use of this software is subject to the terms of the Panda 3d
// Software license.  You should have received a copy of this license
// along with this source code; you will also find a current copy of
// the license at http://www.panda3d.org/license.txt .
//
// To contact the maintainers of this program write to
// panda3d@yahoogroups.com .
//
////////////////////////////////////////////////////////////////////

#include "executionEnvironment.h"

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

#include <errno.h>
#include <stdio.h>  // for perror

#ifdef WIN32_VC
// Windows requires this for getcwd().
#include <direct.h>
#define getcwd _getcwd
#endif

////////////////////////////////////////////////////////////////////
//     Function: ExecutionEnviroment::get_cwd
//       Access: Public, Static
//  Description: Returns the name of the current working directory.
////////////////////////////////////////////////////////////////////
Filename ExecutionEnvironment::
get_cwd() {
  // getcwd() requires us to allocate a dynamic buffer and grow it on
  // demand.
  static size_t bufsize = 1024;
  static char *buffer = NULL;

  if (buffer == (char *)NULL) {
    buffer = new char[bufsize];
  }

  while (getcwd(buffer, bufsize) == (char *)NULL) {
    if (errno != ERANGE) {
      perror("getcwd");
      return string();
    }
    delete[] buffer;
    bufsize = bufsize * 2;
    buffer = new char[bufsize];
    assert(buffer != (char *)NULL);
  }

  return Filename::from_os_specific(buffer);
}