// $Id: drv_mcpp_preproc.cpp 88827 2010-02-04 08:42:41Z johnnyw $

/*

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This product is protected by copyright and distributed under the following
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*/

// Pass an IDL file through the C preprocessor


#include "idl_defines.h"
#include "global_extern.h"
#include "fe_extern.h"
#include "drv_extern.h"
#include "utl_string.h"
#include "ace/Version.h"
#include "ace/Process_Manager.h"
#include "ace/SString.h"
#include "ace/Env_Value_T.h"
#include "ace/ARGV.h"
#include "ace/UUID.h"
#include "ace/Dirent.h"
#include "ace/OS_NS_sys_stat.h"

// FUZZ: disable check_for_streams_include
#include "ace/streams.h"

#include "ace/OS_NS_stdio.h"
#include "ace/OS_NS_unistd.h"
#include "ace/OS_NS_fcntl.h"

#include "mcpp_lib.h"

// Storage for preprocessor args.
unsigned long const DRV_MAX_ARGCOUNT = 1024;
unsigned long DRV_argcount = 0;
ACE_TCHAR const * DRV_arglist[DRV_MAX_ARGCOUNT] = { 0 };

static char const * output_arg_format = 0;
static long output_arg_index = 0;

ACE_TCHAR const DIR_DOT[] = ACE_TEXT (".");
ACE_TCHAR const DIR_DOT_DOT[] = ACE_TEXT ("..");

// Lines can be 1024 chars long intially - it will expand as required.
#define LINEBUF_SIZE 1024
char* drv_line = 0;
static size_t drv_line_size = LINEBUF_SIZE + 1;

// Push the new CPP location if we got a -Yp argument.
void
DRV_cpp_new_location (char const * new_loc)
{
  ACE::strdelete (const_cast<ACE_TCHAR *> (DRV_arglist[0]));
  DRV_arglist[0] = ACE::strnew (ACE_TEXT_CHAR_TO_TCHAR (new_loc));
}

// Push an argument into the DRV_arglist.
void
DRV_cpp_putarg (const char *str)
{
  if (DRV_argcount >= DRV_MAX_ARGCOUNT)
    {
      ACE_ERROR ((LM_ERROR,
                  "%C: More than %d arguments to preprocessor\n",
                  idl_global->prog_name (),
                  DRV_MAX_ARGCOUNT));

      throw Bailout ();
    }

  DRV_arglist[DRV_argcount++] = ACE::strnew (ACE_TEXT_CHAR_TO_TCHAR (str));
}

// Expand the output argument with the given filename.
void
DRV_cpp_expand_output_arg (const char *filename)
{
  if (output_arg_format != 0)
    {
      ACE::strdelete (const_cast<ACE_TCHAR *> (DRV_arglist[output_arg_index]));
      DRV_arglist[output_arg_index] = 0;

      ACE_NEW (DRV_arglist[output_arg_index],
               ACE_TCHAR [ACE_OS::strlen (output_arg_format)
                     + ACE_OS::strlen (filename)
                     + 1]);

      ACE_OS::sprintf (const_cast<ACE_TCHAR *> (DRV_arglist[output_arg_index]),
                       ACE_TEXT_CHAR_TO_TCHAR (output_arg_format),
                       ACE_TEXT_CHAR_TO_TCHAR (filename));
    }
}

// Get a line from stdin.
static bool
DRV_get_line (FILE *f)
{
    char *l = ACE_OS::fgets (drv_line,
                             drv_line_size,
                             f);

    if (l == 0)
      {
        return false;
      }

    if (*l == '\0' && feof (f))
      {
        return false;
      }

    if (*l == '\0')
      {
        return true;
      }

    while (ACE_OS::strchr (drv_line, '\n') == 0)
      {
        // Haven't got to a newline yet.
        // Create a bigger buffer and keep reading.
        size_t temp_size;
        temp_size = drv_line_size * 2;
        char *temp = 0;
        ACE_NEW_RETURN (temp,
                        char[temp_size],
                        false);
        ACE_OS::strcpy (temp, drv_line);
        delete [] drv_line;
        drv_line = temp;
        drv_line_size = temp_size;

        l = ACE_OS::fgets (drv_line + ACE_OS::strlen (drv_line),
                           drv_line_size - ACE_OS::strlen(drv_line),
                           f);

        if (l == 0 || *l == '\0')
          {
            break;
          }
      }

    size_t i = ACE_OS::strlen (drv_line) - 1;

    if (drv_line[i] == '\n')
      {
        drv_line[i] = '\0';
      }

    return true;
}

// Initialize the cpp argument list.
void
DRV_cpp_init (void)
{
  // Create the line buffer.
  // (JP) Deleting this at the end or DRV_pre_proc() causes
  // Purify to output a Freeing Mismatched Memory warning.
  // When it is not deleted (currently the case) there is no
  // memory leak reported by Purify. I don't know why.
  ACE_NEW (drv_line,
           char [drv_line_size]);

  char const * const cpp_loc = FE_get_cpp_loc_from_env ();
  DRV_cpp_putarg (cpp_loc);

  // Add an option to the IDL compiler to make the TAO version
  // available to the user. A XX.YY.ZZ release gets version 0xXXYYZZ,
  // for example, 5.1.14 gets 0x050114.
  char version_option[128];
  ACE_OS::sprintf (version_option,
                   "-D__TAO_IDL=0x%2.2d%2.2d%2.2d",
                   ACE_MAJOR_VERSION,
                   ACE_MINOR_VERSION,
                   ACE_BETA_VERSION);

  DRV_cpp_putarg (version_option);
  DRV_cpp_putarg ("-I.");

  const char *platform_cpp_args = FE_get_cpp_args_from_env ();

  if (platform_cpp_args == 0)
    {
      // If no cpp flag was defined by the user, we define some
      // platform specific flags here.

#if defined (TAO_IDL_PREPROCESSOR_ARGS)
      platform_cpp_args = TAO_IDL_PREPROCESSOR_ARGS;
#elif defined (ACE_CC_PREPROCESSOR_ARGS)
      platform_cpp_args = ACE_CC_PREPROCESSOR_ARGS;
#else
      platform_cpp_args = "-o %s";
#endif /* TAO_IDL_PREPROCESSOR_ARGS */

      // So we can find OMG IDL files, such as `orb.idl'.
      ACE_CString include_path1, include_path2;

      char* TAO_ROOT = ACE_OS::getenv ("TAO_ROOT");

      // When adding new dirs here don't forget to update
      // IDL_GlobalData::validate_orb_include accordingly.
      if (TAO_ROOT != 0)
        {
            DRV_add_include_path (include_path1, TAO_ROOT, 0, true);
            DRV_add_include_path (include_path2, TAO_ROOT, "/tao", true);
        }
      else
        {
          char* ACE_ROOT = ACE_OS::getenv ("ACE_ROOT");

          if (ACE_ROOT != 0)
            {
              DRV_add_include_path (include_path1, ACE_ROOT, "/TAO", true);
              DRV_add_include_path (include_path2, ACE_ROOT, "/TAO/tao", true);
            }
          else
            {
#if defined (TAO_IDL_INCLUDE_DIR)
              // TAO_IDL_INCLUDE_DIR may be in quotes,
              // e.g. "/usr/local/include/tao"
              // We deal with a case like this below ...
              DRV_add_include_path (include_path1, TAO_IDL_INCLUDE_DIR, 0, true);
              DRV_add_include_path (include_path2, TAO_IDL_INCLUDE_DIR, "/tao", true);
#else
              DRV_add_include_path (include_path1, ".", 0, true);
#endif  /* TAO_IDL_INCLUDE_DIR */
            }
        }

      idl_global->tao_root (include_path1.c_str ());
    }

  // Add any flags in platform_cpp_args to cpp's DRV_arglist.
  ACE_ARGV platform_arglist (ACE_TEXT_CHAR_TO_TCHAR (platform_cpp_args));

  for (int i = 0; i < platform_arglist.argc (); ++i)
    {
      // Check for an argument that specifies the preprocessor's output file.
      if (ACE_OS::strstr (platform_arglist[i], ACE_TEXT("%s")) != 0
          && output_arg_format == 0)
        {
          output_arg_format = ACE::strnew (ACE_TEXT_ALWAYS_CHAR (platform_arglist[i]));
          output_arg_index = DRV_argcount;
          DRV_cpp_putarg (0);
        }
      else
        {
          DRV_cpp_putarg (ACE_TEXT_ALWAYS_CHAR (platform_arglist[i]));
        }
    }
}

int
DRV_sweep_dirs (const char *rel_path,
                const char *base_path)
{
  // Zero rel_path means we're not using this option, and
  // so we become a no-op.
  if (rel_path == 0)
    {
      return 0;
    }

  if (ACE_OS::chdir (rel_path) == -1)
    {
      ACE_ERROR_RETURN ((LM_ERROR,
                         "DRV_sweep_dirs: chdir %C failed\n",
                         rel_path),
                        -1);
    }

  ACE_Dirent dir (DIR_DOT);
  ACE_CString bname (base_path);
  bname += (bname.length () > 0 ? "/" : "");
  bname += rel_path;
  bool include_added = false;
  char abspath[MAXPATHLEN] = "";
  char *full_path = 0;

  for (dirent *dir_entry; (dir_entry = dir.read ()) != 0;)
    {
      // Skip the ".." and "." files in each directory.
      if (ACE::isdotdir (dir_entry->d_name) == true)
        continue;

      ACE_CString lname (ACE_TEXT_ALWAYS_CHAR (dir_entry->d_name));
      ACE_stat stat_buf;

      if (ACE_OS::lstat (lname.c_str (), &stat_buf) == -1)
        {
          ACE_ERROR_RETURN ((LM_ERROR,
                             "DRV_sweep_dirs: ACE_OS::lstat (%C) failed\n",
                             lname.c_str ()),
                            -1);
        }

      size_t len = 0;

      switch (stat_buf.st_mode & S_IFMT)
        {
        case S_IFREG: // Either a regular file or an executable.
          len = lname.length ();

          if (len > 4 && lname.substr (len - 4) == ".idl")
            {
              if (!include_added)
                {
                  ACE_CString incl_arg ("-I");
                  incl_arg += bname;
                  DRV_cpp_putarg (incl_arg.c_str ());
                  idl_global->add_rel_include_path (bname.c_str ());
                  full_path = ACE_OS::realpath ("", abspath);

                  if (full_path != 0)
                    {
                      idl_global->add_include_path (full_path, false);
                    }

                  include_added = true;
                }

              ACE_CString fname (bname);
              fname += "/";
              fname += lname;
              DRV_push_file (fname.c_str ());
            }

          break;
        case S_IFDIR: // Subdirectory.
          DRV_sweep_dirs (lname.c_str (), bname.c_str ());
          break;
        case S_IFLNK: // Either a file link or directory link.
        default: // Some other type of file (PIPE/FIFO/device).
          break;
        }
    }

  // Move back up a level.
  if (ACE_OS::chdir (DIR_DOT_DOT) == -1)
    {
      ACE_ERROR_RETURN ((LM_ERROR,
                         "DRV_sweep_dirs: chdir .. (from %C) failed\n",
                         rel_path),
                        -1);
    }

  return 0;
}

ACE_CString&
DRV_add_include_path (ACE_CString& include_path, const char *path,
                      const char *suffix, bool is_system)
{
  if (!path)
    return include_path;

  const bool needToQuote= (('"' == *path) || ACE_OS::strchr (path, ' '));
  const size_t pathLength= ACE_OS::strlen (path);
  const char
#if defined (ACE_WIN32)
    nativeDir=  '\\',
    foreignDir= '/';
#else
    nativeDir=  '/',
    foreignDir= '\\';
#endif

  // Eliminate possible enclosing quotes from the path, and since some compilers
  // choke on double directory separators in paths, ensure that the path does not
  // end with a directory slash.
  include_path=
    ACE_CString (path + ('"' == *path),     // Skip leading Quote
                 pathLength
                 - ('"' == *path)           // Don't count leading Quote
                 - ( (1uL < pathLength) &&  // Don't count trailing Quote XOR directory
                     ('"'        == path [pathLength - 1uL] ||
                      nativeDir  == path [pathLength - 1uL] ||
                      foreignDir == path [pathLength - 1uL]
                   ) )
                 - ( (2uL < pathLength) &&  // Don't count trailing Quote AND directory
                     '"' == path [pathLength - 1uL] &&
                     (nativeDir  == path [pathLength - 2uL] ||
                      foreignDir == path [pathLength - 2uL]
                   ) )
                );

  if (suffix)
    {
      if (!include_path.length () && ((nativeDir == *suffix) || (foreignDir == *suffix)))
        ++suffix; // Path is empty, don't add the suffix's leading directory seporator

      if (include_path.length () && *suffix && (nativeDir != *suffix) && (foreignDir != *suffix))
        include_path+= nativeDir; // Force a directory seporator

      // Add the suffix string to the path, ensuring that foreign directory slashes
      // are added as the native type.
      for ( ; *suffix; ++suffix)
        include_path+= (foreignDir == *suffix) ? nativeDir : *suffix;
    }

  // Build up the include string from the new path+suffix
  ACE_CString include_option ("-I\"", 2 + needToQuote);
  include_option+= include_path;
  if (needToQuote)
    include_option+= '"';

  DRV_cpp_putarg (include_option.c_str ());
  idl_global->add_include_path (include_path.c_str (), is_system);

  return include_path;
}

// Adds additional include paths, but after parse_args() has
// added user-defined include paths.
void
DRV_cpp_post_init (void)
{
  // Add include path for TAO_ROOT/orbsvcs.
  char* TAO_ROOT = ACE_OS::getenv ("TAO_ROOT");

  ACE_CString include_path3, include_path4, include_path5;

  // When adding new dirs here don't forget to update
  // IDL_GlobalData::validate_orb_include accordingly.
  if (TAO_ROOT != 0)
    {
      DRV_add_include_path (include_path3, TAO_ROOT, "/orbsvcs", true);
    }
  else
    {
      // If TAO_ROOT isn't defined, assume it's under ACE_ROOT.
      char* ACE_ROOT = ACE_OS::getenv ("ACE_ROOT");

      if (ACE_ROOT != 0)
        {
          DRV_add_include_path (include_path3, ACE_ROOT, "/TAO/orbsvcs", true);
        }
      else
        {
#if defined (TAO_IDL_INCLUDE_DIR)
          DRV_add_include_path (include_path3,
                                TAO_IDL_INCLUDE_DIR,
                                "/orbsvcs",
                                 true);
#else
          // If ACE_ROOT isn't defined either, there will already
          // be a warning from DRV_preproc().
          DRV_add_include_path (include_path3, ".", 0, true);
#endif /* TAO_IDL_INCLUDE_DIR */
        }
    }

  // Add include paths for CIAO_ROOT and CIAO_ROOT/ciao and ccm.
  char* CIAO_ROOT = ACE_OS::getenv ("CIAO_ROOT");

  // When adding new dirs here don't forget to update
  // IDL_GlobalData::validate_orb_include accordingly.
  if (CIAO_ROOT != 0)
    {
      DRV_add_include_path (include_path4, CIAO_ROOT, 0, true);
      DRV_add_include_path (include_path5, CIAO_ROOT, "/ciao", true);
      DRV_add_include_path (include_path5, CIAO_ROOT, "/ccm", true);
    }
  else if (TAO_ROOT != 0)
    {
      // If CIAO_ROOT hasn't been set, maybe it's nested under TAO_ROOT.
      DRV_add_include_path (include_path4, TAO_ROOT, "/CIAO", true);
      DRV_add_include_path (include_path5, TAO_ROOT, "/CIAO/ciao", true);
      DRV_add_include_path (include_path5, TAO_ROOT, "/CIAO/ccm", true);
    }
  else
    {
      // If TAO_ROOT hasn't been set, try ACE_ROOT.
      char* ACE_ROOT = ACE_OS::getenv ("ACE_ROOT");

      if (ACE_ROOT != 0)
        {
          DRV_add_include_path (include_path4, ACE_ROOT, "/TAO/CIAO", true);
          DRV_add_include_path (include_path5, ACE_ROOT, "/TAO/CIAO/ciao", true);
          DRV_add_include_path (include_path5, ACE_ROOT, "/TAO/CIAO/ccm", true);
        }
      else
        {
#if defined (TAO_IDL_INCLUDE_DIR)
          DRV_add_include_path (include_path4,
                                TAO_IDL_INCLUDE_DIR,
                                0,
                                true);
          DRV_add_include_path (include_path5,
                                TAO_IDL_INCLUDE_DIR,
                                "/ciao",
                                true);
          DRV_add_include_path (include_path5,
                                TAO_IDL_INCLUDE_DIR,
                                "/ccm",
                                true);
#else
          // If ACE_ROOT isn't defined either, there will already
          // be a warning from DRV_preproc().
          DRV_add_include_path (include_path4, ACE_ROOT, ".", true);
          DRV_add_include_path (include_path5, ACE_ROOT, ".", true);
#endif /* TAO_IDL_INCLUDE_DIR */
        }
    }

  // Save path of current directory, in case the call to DRV_sweep_dirs()
  // below is not a no-op - then the current working directory will
  // have to be restored.
  char cwd_path[MAXPATHLEN];
  if (ACE_OS::getcwd (cwd_path, sizeof (cwd_path)) == 0)
    {
      ACE_ERROR ((LM_ERROR,
                  "DRV_cpp_post_init: ACE_OS::getcwd failed\n"));

      throw Bailout ();
    }

  // If first arg is non-zero, adds an include path and filename
  // for every IDL file found in all subdirectories. This is a
  // no-op for most backends.
  if (DRV_sweep_dirs (idl_global->recursion_start (), "") == -1)
    {
      ACE_ERROR ((LM_ERROR,
                  "DRV_cpp_post_init: DRV_sweep_dirs (%C) failed\n",
                  idl_global->recursion_start ()));

      throw Bailout ();
    }

  // This is redundant for most backends, but not if the call to
  // DRV_sweep_dirs() above is more than a no-op.
  if (ACE_OS::chdir (cwd_path) == -1)
    {
      ACE_ERROR ((LM_ERROR,
                  "DRV_cpp_post_init: ACE_OS::chdir (%C) failed\n",
                  cwd_path));

      throw Bailout ();
    }
}

// We really need to know whether this line is a "#include ...". If
// so, we would like to separate the "file name" and keep that in the
// idl_global. We need them to produce "#include's in the stubs and
// skeletons.
void
DRV_check_for_include (const char* buf)
{
  const char* r = buf;
  const char* h;

  // Skip the tabs and spaces.
  while (*r == ' ' || *r == '\t')
    {
      ++r;
    }

  // Skip initial '#'.
  if (*r != '#')
    {
      return;
    }
  else
    {
      r++;
    }

  // Skip the tabs and spaces.
  while (*r == ' ' || *r == '\t')
    {
      ++r;
    }

  // Probably we are at the word `include`. If not return.
  if (*r != 'i')
    {
      return;
    }

  // Check whether this word is `include` or no.
  static const char include_str[] = "include";

  for (size_t ii = 0;
       ii < (sizeof (include_str) / sizeof (include_str[0]) - 1)
         && *r != '\0' && *r != ' ' && *r != '\t';
       ++r, ++ii)
    {
      // Return if it doesn't match.
      if (include_str[ii] != *r)
        {
          return;
        }
    }

  // Next thing is finding the file that has been `#include'd. Skip
  // all the blanks and tabs and reach the startng " or < character.
  for (; (*r != '"') && (*r != '<'); ++r)
    {
      if (*r == '\n' || *r == '\0')
        {
          return;
        }
    }

  // Decide on the end char.
  char end_char = '"';

  if (*r == '<')
    {
      end_char = '>';
    }

  // Skip this " or <.
  ++r;

  // Store this position.
  h = r;

  // We're not handling redirection from stdin.
  if (*h == '\0')
    {
      ACE_ERROR ((LM_ERROR, "TAO_IDL: No input files\n"));


      throw Bailout ();
    }

  // Find the closing " or < character.
  for (; *r != end_char; ++r)
    {
      continue;
    }

  // Copy the chars.
  char incl_file[MAXPATHLEN + 1] = { 0 };
  size_t fi = 0;

  for (; h != r; ++fi, ++h)
    {
      incl_file [fi] = *h;
    }

  // Terminate the string.
  incl_file [fi] = '\0';

  // Put Microsoft-style pathnames into a canonical form.
  size_t i = 0;

  for (size_t j = 0; incl_file [j] != '\0'; ++i, ++j)
    {
      if (incl_file [j] == '\\' && incl_file [j + 1] == '\\')
        {
          j++;
        }

      incl_file [i] = incl_file [j];
    }

  // Terminate this string.
  incl_file [i] = '\0';

  size_t const len = ACE_OS::strlen (incl_file);
  ACE_CString const name_str (incl_file);
  ACE_CString const simple ("orb.idl");
  ACE_CString const nix_path ("tao/orb.idl");
  ACE_CString const win_path ("tao\\orb.idl");

  // Some backends pass this file through, others don't.
  if (name_str == simple || name_str == nix_path || name_str == win_path)
    {
      if (idl_global->pass_orb_idl ())
        {
          idl_global->add_to_included_idl_files (incl_file);
        }
      else
        {
          DRV_get_orb_idl_includes ();
        }
    }

  // We have special lookup for orb.idl (TAO_ROOT/tao) that
  // also kicks in for .pidl files. If one of the latter is
  // included as a local name only, we add the 'tao/' prefix
  // so the generated C++ include files will be correct.
  else if (ACE_OS::strcmp (incl_file + len - 5, ".pidl") == 0
           && ACE_OS::strchr (incl_file, '/') == 0
           && ACE_OS::strchr (incl_file, '\\') == 0)
    {
      ACE_CString fixed_name ("tao/");
      fixed_name += incl_file;

      idl_global->add_to_included_idl_files (fixed_name.rep ());
    }
  else
    {
      idl_global->add_to_included_idl_files (incl_file);
    }
}

// This method turns a line like '#include "a.idl"' into the
// line '#include <a.idl>'
void
DRV_convert_includes (const char* buf)
{
  // Remove constness
  char* r = const_cast<char*> (buf);

  // Skip the tabs and spaces.
  while (*r == ' ' || *r == '\t')
    {
      ++r;
    }

  // Skip initial '#'.
  if (*r != '#')
    {
      return;
    }
  else
    {
      r++;
    }

  // Skip the tabs and spaces.
  while (*r == ' ' || *r == '\t')
    {
      ++r;
    }

  // Probably we are at the word `include`. If not return.
  if (*r != 'i')
    {
      return;
    }

  // Check whether this word is `include` or no.
  static const char include_str[] = "include";

  for (size_t ii = 0;
       ii < (sizeof (include_str) / sizeof (include_str[0]) - 1)
         && *r != '\0' && *r != ' ' && *r != '\t';
       ++r, ++ii)
    {
      // Return if it doesn't match.
      if (include_str[ii] != *r)
        {
          return;
        }
    }

  // Next thing is finding the file that has been `#include'd. Skip
  // all the blanks and tabs and reach the startng " character.
  for (; (*r != '"'); ++r)
    {
      if (*r == '\n' || *r == '\0')
        {
          return;
        }
    }

  // Replace the opening quote with an angle bracket.
  *r = '<';

  // We're not handling redirection from stdin.
  if (*r == '\0')
    {
      ACE_ERROR ((LM_ERROR, "TAO_IDL: No input files\n"));


      throw Bailout ();
    }

  // Find the closing '"' character.
  for (; *r != '"'; ++r)
    {
      continue;
    }

  // Swap it for a '>'
  if (*r == '"')
    {
      *r = '>';
    }
}

void
DRV_get_orb_idl_includes (void)
{
  static char const orb_idl[] = "tao/orb.idl";

 // Search for orb.idl in supplied include file search paths.
  char const * directory = 0;
  FILE * fp = idl_global->open_included_file (orb_idl, directory);

  if (fp == 0)
    {
      // Fall back on $TAO_ROOT/tao/orb.idl if orb.idl is not in the
      // include path.
      ACE_CString orb_idl_path (ACE_CString (idl_global->tao_root ())
                                + ACE_CString ('/')
                                + ACE_CString (orb_idl));

      fp = ACE_OS::fopen (orb_idl_path.c_str (), "r");

      if (fp == 0)
        {
          ACE_ERROR ((LM_ERROR,
                      "TAO_IDL: cannot open or find file: %C\n",
                      orb_idl_path.c_str ()));

          throw Bailout ();
        }
    }
  else
    {
      // Make sure the include directory containing orb.idl is passed
      // to the preprocessor.
      // This should go after user supplied include paths.
      ACE_CString include_path_arg;
      DRV_add_include_path (include_path_arg, directory, "/tao", true);
    }

  while (DRV_get_line (fp))
    {
      // Find the included .pidl files in orb.idl and add them to the
      // included IDL file list.
      DRV_check_for_include (drv_line);
    }

  ACE_OS::fclose (fp);
}

// Strip down a name to the last component,
// i.e. everything after the last '/' or '\' character.
static char *
DRV_stripped_name (char *fn)
{
    char *n = fn;
    size_t l;

    if (n == 0)
      {
        return 0;
      }

    l = ACE_OS::strlen (n);
    int slash_found = 0;

    for (n += l - 1; n >= fn && !slash_found; n--)
      {
        slash_found = (*n == '/' || *n == '\\');
      }

    n += 1;

    if (slash_found)
      {
        n += 1;
      }

    return n;
}

static void
DRV_check_file_for_includes (const char *filename)
{
  FILE * const fin = ACE_OS::fopen (filename, "r");
  if (fin == 0)
    {
      ACE_ERROR ((LM_ERROR,
                  "%C: cannot open input file\n",
                  idl_global->prog_name ()));

      throw Bailout ();
    }

  while (DRV_get_line (fin))
    {
      DRV_convert_includes (drv_line);

      // We really need to know whether this line is a "#include
      // ...". If so, we would like to separate the "file name" and
      // keep that in the idl_global. We need them to produce
      // "#include's in the stubs and skeletons.
      DRV_check_for_include (drv_line);
    }

  ACE_OS::fclose(fin);
}

// Pass input through preprocessor.
void
DRV_pre_proc (const char *myfile)
{
  DRV_check_file_for_includes (myfile);

#if defined (ACE_OPENVMS)
  {
    char main_abspath[MAXPATHLEN] = "";
    char trans_path[MAXPATHLEN] = "";
    char *main_fullpath =
      ACE_OS::realpath (IDL_GlobalData::translateName (myfile, trans_path),
                        main_abspath);
    idl_global->set_main_filename (
                        idl_global->utl_string_factory (main_fullpath));
  }
#else
  idl_global->set_main_filename (idl_global->utl_string_factory (myfile));
#endif

  ACE_Auto_String_Free safety (ACE_OS::strdup (myfile));
  UTL_String *tmp =
    idl_global->utl_string_factory (DRV_stripped_name (safety.get ()));
  idl_global->set_stripped_filename (tmp);

  idl_global->set_real_filename (idl_global->utl_string_factory (myfile)); //t_ifile));

  DRV_cpp_putarg (myfile);

  char * tmp_arglist [DRV_MAX_ARGCOUNT] = { 0 };

  for (size_t i = 0; i < DRV_argcount; ++i)
    {
      tmp_arglist[i] = ACE::strnew (ACE_TEXT_ALWAYS_CHAR (DRV_arglist[i]));
    }

  // tell mcpp to use memory buffers, instead of an output file.
  mcpp_use_mem_buffers(1);

  if (mcpp_lib_main (DRV_argcount, tmp_arglist) != 0)
    {
      ACE_ERROR ((LM_ERROR,
                  "%C: mcpp preprocessor execution failed:\n%C",
                  idl_global->prog_name (),
                  mcpp_get_mem_buffer (ERR)));
      throw Bailout ();
    }

  for (size_t i = 0; i < DRV_argcount; ++i)
    delete tmp_arglist[i];

  // Remove the null termination and the input file from the DRV_arglist,
  // the next file will the previous args.
  DRV_argcount -= 2;
  ACE::strdelete (const_cast<ACE_TCHAR *> (DRV_arglist[DRV_argcount]));
  DRV_arglist[DRV_argcount] = 0;

  char * yyin = mcpp_get_mem_buffer(OUT);


  if (yyin == 0)
    {
      ACE_ERROR ((LM_ERROR,
                  "%C: Could not retrieve preprocessed buffer\n%C",
                  idl_global->prog_name (),
                  mcpp_get_mem_buffer(ERR)));

      throw Bailout ();
    }

  FE_set_yyin (yyin);

  if (idl_global->compile_flags () & IDL_CF_ONLY_PREPROC)
    {
//      char buffer[ACE_MAXLOGMSGLEN];
//      size_t bytes;

      // ACE_DEBUG sends to stderr - we want stdout for this dump
      // of the preprocessor output. So we modify the singleton that
      // was created in this process. Since IDL_CF_ONLY_PREPROC causes
      // an (almost) immediate exit below, we don't have to restore
      // the singleton's default parameters.
      ACE_Log_Msg *out = ACE_Log_Msg::instance ();
      out->msg_ostream (&cout);
      out->clr_flags (ACE_Log_Msg::STDERR);
      out->set_flags (ACE_Log_Msg::OSTREAM);

      size_t end = ACE_OS::strlen (yyin);

      for (size_t i = 0; i < end; i += ACE_MAXLOGMSGLEN)
        {
          ACE_DEBUG ((LM_DEBUG, "%C",
                      yyin + i));
        }
      /*
      while ((bytes = ACE_OS::fread (buffer,
                                     sizeof (char),
                                     ACE_MAXLOGMSGLEN - 1,
                                     preproc))
          != 0)
        {
          buffer[bytes] = 0;

          ACE_DEBUG ((LM_DEBUG,
                      buffer));
        }

        ACE_OS::fclose (preproc);*/
      }
      // need to free buffers?
}
