// utl_global.cpp,v 1.88 2003/01/03 20:48:15 parsons Exp

/*

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This product is protected by copyright and distributed under the following
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The Interface Definition Language Compiler Front End (CFE) is made
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this product is incorporated in whole or part. You may copy and extend
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*/

#include "idl_global.h"
#include "global_extern.h"
#include "ast_root.h"
#include "ast_generator.h"
#include "utl_identifier.h"
#include "utl_indenter.h"
#include "utl_err.h"
#include "utl_string.h"

ACE_RCSID (util, 
           utl_global, 
           "utl_global.cpp,v 1.88 2003/01/03 20:48:15 parsons Exp")

// Define an increment for the size of the array used to store names of
// included files.
#undef INCREMENT
#define INCREMENT 64

IDL_GlobalData::IDL_GlobalData (void)
  : pd_root (0),
    pd_gen (0),
    pd_err (0),
    pd_err_count (0),
    pd_lineno (0),
    pd_filename (0),
    pd_main_filename (0),
    pd_real_filename (0),
    pd_stripped_filename (0),
    pd_import (I_FALSE),
    pd_in_main_file (I_FALSE),
    pd_prog_name (0),
    pd_cpp_location (0),
    pd_compile_flags (0),
    pd_be (0),
    pd_local_escapes (0),
    pd_indent (0),
    pd_read_from_stdin (I_FALSE),
    pd_include_file_names (0),
    pd_n_include_file_names (0),
    pd_n_alloced_file_names (0),
    included_idl_files_ (0),
    n_included_idl_files_ (0),
    n_allocated_idl_files_ (0),
    pd_parse_state (PS_NoState),
    pd_idl_src_file (0),
    gperf_path_ (0),
    temp_dir_ (0),
    ident_string_ (0),
    obv_support_ (I_TRUE),
    case_diff_error_ (I_TRUE),
    nest_orb_ (I_FALSE),
    idl_flags_ (""),
    last_seen_index_ (1)
{
  // Path for the perfect hash generator(gperf) program.
  // Default is $ACE_ROOT/bin/gperf unless ACE_GPERF is defined.
  // Use ACE_GPERF if $ACE_ROOT hasn't been set or won't be set
  // in the environment.
  // Form the absolute pathname.
  char* ace_root = ACE_OS::getenv ("ACE_ROOT");
  if (ace_root == 0)
    // This may not cause any problem if -g option is used to specify
    // the correct path for the  gperf program. Let us ignore this
    // error here. It will be caught when we check the existence of
    // the perfect hasher and at that time, we can switch over to some
    // other scheme.
    {
#if defined (ACE_GPERF)
      // The actual gperf program must be included in the definition of
      // ACE_GPERF, not just the directory in which it is located.
      const char ace_gperf[] = ACE_GPERF;
      ACE_NEW (this->gperf_path_,
               char [ACE_OS::strlen (ace_gperf) + 1]);
      ACE_OS::sprintf (this->gperf_path_,
                       "%s",
                       ace_gperf);
#else
      this->gperf_path_ = 0;
#endif
    }
  else
    {
#if defined (ACE_GPERF)
      const char ace_gperf[] = ACE_GPERF;
      ACE_NEW (this->gperf_path_,
               char [ACE_OS::strlen (ace_root) 
                     + ACE_OS::strlen (ace_gperf) 
                     + 1]);
#  if defined (ACE_WIN32)
      ACE_OS::sprintf (this->gperf_path_,
                       "%s\\bin\\%s",
                       ace_root, 
                       ace_gperf);
#  else /* Not ACE_WIN32 */
      ACE_OS::sprintf (this->gperf_path_,
                       "%s/bin/%s",
                       ace_root,
                       ace_gperf);
#  endif /* ACE_WIN32 */
#else /* Not ACE_GPERF */
      // Set it to the default value.
      ACE_NEW (this->gperf_path_,
               char [ACE_OS::strlen (ace_root) 
                     + ACE_OS::strlen ("/bin/gperf") 
                     + 1]);
#  if defined (ACE_WIN32)
      ACE_OS::sprintf (this->gperf_path_,
                       "%s\\bin\\gperf",
                       ace_root);
#  else /* Not ACE_WIN32 */
      ACE_OS::sprintf (this->gperf_path_,
                       "%s/bin/gperf",
                       ace_root);
#  endif /* ACE_WIN32 */
#endif /* ACE_GPERF */
    }
}

IDL_GlobalData::~IDL_GlobalData (void)
{
}

// Get or set scopes stack
UTL_ScopeStack &
IDL_GlobalData::scopes (void)
{
  return this->pd_scopes;
}

// Get or set root of AST
AST_Root *
IDL_GlobalData::root (void)
{
  return this->pd_root;
}

void
IDL_GlobalData::set_root (AST_Root *r)
{
  this->pd_root = r;
}

// Get or set generator object
AST_Generator *
IDL_GlobalData::gen (void)
{
  return this->pd_gen;
}

void
IDL_GlobalData::set_gen (AST_Generator *g)
{
  this->pd_gen = g;
}

// Get or set error object
UTL_Error *
IDL_GlobalData::err (void)
{
  return this->pd_err;
}

void
IDL_GlobalData::set_err (UTL_Error *e)
{
  this->pd_err = e;
}

// Get or set error count
long
IDL_GlobalData::err_count (void)
{
  return this->pd_err_count;
}

void
IDL_GlobalData::set_err_count (long c)
{
  this->pd_err_count = c;
}

// Get or set line number
long
IDL_GlobalData::lineno (void)
{
  return this->pd_lineno;
}

void
IDL_GlobalData::set_lineno (long n)
{
  this->pd_lineno = n;
}

// Get or set file name being read now
UTL_String *
IDL_GlobalData::filename (void)
{
  return this->pd_filename;
}

void
IDL_GlobalData::set_filename (UTL_String *s)
{
  if (this->pd_filename != 0)
    {
      this->pd_filename->destroy ();
      delete this->pd_filename;
      this->pd_filename = 0;
    }

  this->pd_filename = s;
}

// Get or set main file name
UTL_String *
IDL_GlobalData::main_filename (void)
{
  return this->pd_main_filename;
}

void
IDL_GlobalData::set_main_filename (UTL_String *n)
{
  if (this->pd_main_filename != 0)
    {
      this->pd_main_filename->destroy ();
      delete this->pd_main_filename;
      this->pd_main_filename = 0;
    }

  this->pd_main_filename = n;
}

// Get or set real file name
UTL_String *
IDL_GlobalData::real_filename (void)
{
  return this->pd_real_filename;
}

void
IDL_GlobalData::set_real_filename (UTL_String *n)
{
  if (this->pd_real_filename != 0)
    {
      this->pd_real_filename->destroy ();
      delete this->pd_real_filename;
      this->pd_real_filename = 0;
    }

  this->pd_real_filename = n;
}

// Get or set indicator whether import is on
idl_bool
IDL_GlobalData::imported (void)
{
  return this->pd_in_main_file ? I_FALSE : pd_import;
}

idl_bool
IDL_GlobalData::import (void)
{
  return this->pd_import;
}

void
IDL_GlobalData::set_import (idl_bool is_in)
{
  this->pd_import = is_in;
}

// Get or set indicator whether we're reading the main file now
idl_bool
IDL_GlobalData::in_main_file (void)
{
  return this->pd_in_main_file;
}

void
IDL_GlobalData::set_in_main_file (idl_bool is_in)
{
  this->pd_in_main_file = is_in;
}

// Get or set stripped file name
UTL_String *
IDL_GlobalData::stripped_filename (void)
{
  return this->pd_stripped_filename;
}

void
IDL_GlobalData::set_stripped_filename (UTL_String *nm)
{
  if (this->pd_stripped_filename != 0)
    delete this->pd_stripped_filename;

  this->pd_stripped_filename = nm;
}

// Get or set cache value for argv[0]
const char *
IDL_GlobalData::prog_name (void)
{
  return this->pd_prog_name;
}

void
IDL_GlobalData::set_prog_name (const char *pn)
{
  this->pd_prog_name = pn;
}

// Get or set location to find C preprocessor
const char *
IDL_GlobalData::cpp_location (void)
{
  return this->pd_cpp_location;
}

void
IDL_GlobalData::set_cpp_location (const char *l)
{
  this->pd_cpp_location = l;
}

// Get or set IDL compiler flags
long
IDL_GlobalData::compile_flags (void)
{
  return this->pd_compile_flags;
}

void
IDL_GlobalData::set_compile_flags (long cf)
{
  this->pd_compile_flags = cf;
}

// Get or set BE to be used
const char *
IDL_GlobalData::be (void)
{
  return this->pd_be;
}

void
IDL_GlobalData::set_be (const char *nbe)
{
  this->pd_be = nbe;
}

// Get or set local escapes string. This provides additional mechanism
// to pass information to a BE.
char *
IDL_GlobalData::local_escapes (void)
{
  return this->pd_local_escapes;
}

void
IDL_GlobalData::set_local_escapes (const char *e)
{
  if (this->pd_local_escapes != 0)
    {
      delete [] this->pd_local_escapes;
    }

  this->pd_local_escapes = ACE::strnew (e);
}

// Get or set indent object
UTL_Indenter *
IDL_GlobalData::indent (void)
{
  return this->pd_indent;
}

void
IDL_GlobalData::set_indent (UTL_Indenter *i)
{
  this->pd_indent = i;
}

// Get or set indicator whether we're reading from stdin.
idl_bool
IDL_GlobalData::read_from_stdin (void)
{
  return this->pd_read_from_stdin;
}

void
IDL_GlobalData::set_read_from_stdin (idl_bool r)
{
  this->pd_read_from_stdin = r;
}

// Have we seen this #include file name before?
long
IDL_GlobalData::seen_include_file_before (char *n)
{
  unsigned long i;
  char *incl = 0;
  char *tmp = n;

  if (n[0] == '.')
    {
      tmp = n + 2;
    }

  for (i = 0; i < this->pd_n_include_file_names; ++i)
    {
      incl = this->pd_include_file_names[i]->get_string ();

      if (ACE_OS::strcmp (tmp, incl) == 0)
        {
          // We use the index value in the function below. We
          // add 1 so a match on the first try will not return 0.
          return (long) i + 1;
        }
    }

  return I_FALSE;
}

// Store the name of an #include file.
void
IDL_GlobalData::store_include_file_name (UTL_String *n)
{
  UTL_String **o_include_file_names;
  unsigned long o_n_alloced_file_names;
  unsigned long i;
  long seen = this->seen_include_file_before (n->get_string ());

  // Check if we need to store it at all or whether we've seen it already.
  if (seen)
    {
      this->last_seen_index_ = seen;
      return;
    }

  // OK, need to store. Make sure there's space for one more string
  if (this->pd_n_include_file_names == this->pd_n_alloced_file_names)
    {
      // Allocating more space.
      if (this->pd_n_alloced_file_names == 0)
        {
          this->pd_n_alloced_file_names = INCREMENT;
          ACE_NEW (this->pd_include_file_names,
                   UTL_String *[this->pd_n_alloced_file_names]);
        }
      else
        {
          o_include_file_names = this->pd_include_file_names;
          o_n_alloced_file_names = this->pd_n_alloced_file_names;
          this->pd_n_alloced_file_names += INCREMENT;
          ACE_NEW (this->pd_include_file_names,
                   UTL_String *[this->pd_n_alloced_file_names]);

          for (i = 0; i < o_n_alloced_file_names; ++i)
            {
              this->pd_include_file_names[i] = o_include_file_names[i];
            }

          delete [] o_include_file_names;
        }
    }

  // Store it.
  this->pd_include_file_names[this->pd_n_include_file_names++] = n;
  this->last_seen_index_ = this->pd_n_include_file_names;
}

void
IDL_GlobalData::set_include_file_names (UTL_String **ns)
{
  this->pd_include_file_names = ns;
}

UTL_String **
IDL_GlobalData::include_file_names (void)
{
  return this->pd_include_file_names;
}

void
IDL_GlobalData::set_n_include_file_names (unsigned long n)
{
  pd_n_include_file_names = n;
}

unsigned long
IDL_GlobalData::n_include_file_names (void)
{
  return pd_n_include_file_names;
}

// Access methods to deal with other IDL files included in the main
// IDL file.

void
IDL_GlobalData::add_to_included_idl_files (char* file_name)
{
  // Is there enough space there to store one more file.
  if (this->n_included_idl_files_ == this->n_allocated_idl_files_)
    {
      // Allocating more space.
      if (this->n_allocated_idl_files_ == 0)
        {
          // First time creation.
          this->n_allocated_idl_files_ = INCREMENT;
          ACE_NEW (this->included_idl_files_,
                   char *[this->n_allocated_idl_files_]);
        }
      else
        {
          // Adding more storage.
          char** old_included_idl_files =
            this->included_idl_files_;
          size_t n_old_allocated_idl_files =
            this->n_allocated_idl_files_;
          this->n_allocated_idl_files_ += INCREMENT;
          ACE_NEW (this->included_idl_files_,
                   char *[this->n_allocated_idl_files_]);

          for (size_t i = 0; i < n_old_allocated_idl_files; ++i)
            {
              this->included_idl_files_ [i] = old_included_idl_files [i];
            }

          delete [] old_included_idl_files;
        }
    }

  // Store it.
  this->included_idl_files_ [this->n_included_idl_files_++] = file_name;
}

char**
IDL_GlobalData::included_idl_files (void)
{
  return this->included_idl_files_;
}

size_t
IDL_GlobalData::n_included_idl_files (void)
{
  return this->n_included_idl_files_;
}

// Set the number of included_idl_files. Use this carefully. This
// method is used when we validate all the #included idl files,
// against the ones that we get after preprocessing.
void
IDL_GlobalData::n_included_idl_files (size_t n)
{
  this->n_included_idl_files_ = n;
}

// Validate the included idl files, somefiles might have been
// ignored by the preprocessor.
void
IDL_GlobalData::validate_included_idl_files (void)
{
  // Flag to make sure we don't repeat things.
  static int already_done = 0;

  if (already_done == 1)
    {
      return;
    }

  already_done = 1;

  // New number of included_idl_files.
  size_t newj = 0;

  size_t n_pre_preproc_includes = idl_global->n_included_idl_files ();
  char **pre_preproc_includes = idl_global->included_idl_files ();
  size_t n_post_preproc_includes = idl_global->n_include_file_names ();
  UTL_String **post_preproc_includes = idl_global->include_file_names ();

  for (size_t j = 0; j < n_pre_preproc_includes; ++j)
    {
      // Check this name with the names list that we got from the
      // preprocessor.
      size_t valid_file = 0;

      for (size_t ni = 0; ni < n_post_preproc_includes; ++ni)
        {
          if (ACE_OS::strcmp (post_preproc_includes[ni]->get_string (), 
                              pre_preproc_includes[j]) 
               == 0)
            {
             // This file name is valid.
              valid_file = 1;
              break;
            }
        }

      // Remove the file, if it is not valid.
      if (valid_file == 0)
        {
          delete pre_preproc_includes[j];
          pre_preproc_includes[j] = 0;
        }
      else
        {
          // File is valid.

          // Move it to new index if necessary.
          if (j != newj)
            {
              // Move to the new index position.
              pre_preproc_includes[newj] =
                pre_preproc_includes[j];

              // Make old position 0.
              pre_preproc_includes[j] = 0;
            }

          // Increment the new index.
          newj++;
        }
    }

  // Now adjust the count on the included_idl_files.
  idl_global->n_included_idl_files (newj);
}

void
IDL_GlobalData::set_parse_state(ParseState ps)
{
  pd_parse_state = ps;
}

IDL_GlobalData::ParseState
IDL_GlobalData::parse_state()
{
  return pd_parse_state;
}

/*
 * Convert a PredefinedType to an ExprType
 */
AST_Expression::ExprType
IDL_GlobalData::PredefinedTypeToExprType (
    AST_PredefinedType::PredefinedType pt
  )
{
  switch (pt) {
  case AST_PredefinedType::PT_long:
    return AST_Expression::EV_long;
  case AST_PredefinedType::PT_ulong:
    return AST_Expression::EV_ulong;
  case AST_PredefinedType::PT_short:
    return AST_Expression::EV_short;
  case AST_PredefinedType::PT_ushort:
    return AST_Expression::EV_ushort;
  case AST_PredefinedType::PT_longlong:
    return AST_Expression::EV_longlong;
  case AST_PredefinedType::PT_ulonglong:
    return AST_Expression::EV_ulonglong;
  case AST_PredefinedType::PT_float:
    return AST_Expression::EV_float;
  case AST_PredefinedType::PT_double:
    return AST_Expression::EV_double;
  case AST_PredefinedType::PT_longdouble:
    return AST_Expression::EV_longdouble;
  case AST_PredefinedType::PT_char:
    return AST_Expression::EV_char;
  case AST_PredefinedType::PT_wchar:
    return AST_Expression::EV_wchar;
  case AST_PredefinedType::PT_octet:
    return AST_Expression::EV_octet;
  case AST_PredefinedType::PT_boolean:
    return AST_Expression::EV_bool;
  case AST_PredefinedType::PT_void:
    return AST_Expression::EV_void;
  default:
    return AST_Expression::EV_enum;
  }
}

// returns the IDL source file being copiled
UTL_String* IDL_GlobalData::idl_src_file (void)
{
  return this->pd_idl_src_file;
}

// set the source IDL file that is being parsed
void IDL_GlobalData::idl_src_file (UTL_String *s)
{
  this->pd_idl_src_file = s;
}

void
IDL_GlobalData::temp_dir (const char *s)
{
  // Delete the old pointer.
  delete [] this->temp_dir_;

  // Allocate memory, 1 for the end of string.
  ACE_NEW (this->temp_dir_,
           char [ACE_OS::strlen (s) +
                ACE_OS::strlen (ACE_DIRECTORY_SEPARATOR_STR) +
                1]);

  // Copy the strings.
  ACE_OS::sprintf (this->temp_dir_,
                   "%s%s",
                   s,
                   ACE_DIRECTORY_SEPARATOR_STR);
}

const char *
IDL_GlobalData::temp_dir (void) const
{
  return this->temp_dir_;
}

void
IDL_GlobalData::gperf_path (const char *s)
{
  delete [] this->gperf_path_;
  this->gperf_path_ = ACE::strnew (s);
}

const char *
IDL_GlobalData::gperf_path (void) const
{
  return this->gperf_path_;
}

void
IDL_GlobalData::ident_string (const char *s)
{
  delete [] this->ident_string_;
  this->ident_string_ = ACE::strnew (s);
}

const char *
IDL_GlobalData::ident_string (void) const
{
  return this->ident_string_;
}

void
IDL_GlobalData::obv_support (idl_bool val)
{
  this->obv_support_ = val;
}

idl_bool
IDL_GlobalData::obv_support (void)
{
  return this->obv_support_;
}

void
IDL_GlobalData::case_diff_error (idl_bool val)
{
  this->case_diff_error_ = val;
}

idl_bool
IDL_GlobalData::case_diff_error (void)
{
  return this->case_diff_error_;
}

void
IDL_GlobalData::nest_orb (idl_bool val)
{
  this->nest_orb_ = val;
}

idl_bool
IDL_GlobalData::nest_orb (void)
{
  return this->nest_orb_;
}

void
IDL_GlobalData::destroy (void)
{
  if (this->pd_filename != 0)
    {
      this->pd_filename->destroy ();
      delete this->pd_filename;
      this->pd_filename = 0;
    }

  if (this->pd_main_filename != 0)
    {
      this->pd_main_filename->destroy ();
      delete this->pd_main_filename;
      this->pd_main_filename = 0;
    }

  if (this->pd_real_filename != 0)
    {
      this->pd_real_filename->destroy ();
      delete this->pd_real_filename;
      this->pd_real_filename = 0;
    }

  if (this->pd_stripped_filename != 0)
    {
      this->pd_stripped_filename->destroy ();
      delete this->pd_stripped_filename;
      this->pd_stripped_filename = 0;
    }

  if (this->pd_idl_src_file != 0)
    {
      this->pd_idl_src_file->destroy ();
      delete this->pd_idl_src_file;
      this->pd_idl_src_file = 0;
    }

  size_t size = this->pragma_prefixes ().size  ();
  char *trash = 0;

  for (size_t i = 0; i < size; ++i)
    {
      this->pragma_prefixes ().pop (trash);
      delete [] trash;
      trash = 0;
    }

  this->pd_root->destroy ();
  delete this->pd_root;
  this->pd_root = 0;

  delete this->pd_err;
  this->pd_err = 0;
  delete this->pd_gen;
  this->pd_gen = 0;
  delete this->pd_indent;
  this->pd_indent = 0;
  delete [] this->pd_local_escapes;
  this->pd_local_escapes = 0;
  delete [] this->gperf_path_;
  this->gperf_path_ = 0;
  delete [] this->temp_dir_;
  this->temp_dir_ = 0;
  delete [] this->ident_string_;
  this->ident_string_ = 0;
}

void
IDL_GlobalData::append_idl_flag (const char *s)
{
  idl_flags_ += " " + ACE_CString (s);
}

const char *
IDL_GlobalData::idl_flags (void) const
{
  return idl_flags_.c_str ();
}

ACE_Hash_Map_Manager<ACE_CString, int, ACE_Null_Mutex> &
IDL_GlobalData::idl_keywords (void)
{
  return this->idl_keywords_;
}

ACE_Unbounded_Stack<char *> &
IDL_GlobalData::pragma_prefixes (void)
{
  return this->pragma_prefixes_;
}

void 
IDL_GlobalData::update_prefix (char *filename)
{
  // If we are just starting up and processing the temporary filename,
  // there are no prefix issues to deal with yet.
  if (this->pd_main_filename == 0 || this->pd_filename == 0)
    {
      return;
    }

  char *fstring = this->pd_filename->get_string ();

  // We have to do this check because some preprocessors (gcc 3.2
  // on RedHat Linux 7.1, for one) output the same filename
  // multiple times for no apparent reason, and we don't want it
  // to clear the prefix.
  if (ACE_OS::strcmp (fstring, filename) == 0)
    {
      return;
    }

  ACE_CString tmp ("", 0, 0);
  char *main_filename = this->pd_main_filename->get_string ();

  // The first branch is executed if we are finishing an
  // included IDL file (but the current filename has not yet
  // been changed). So we check for (1) the current filename is
  // not the same as the main filename (2) the prefix stack size
  // is greater than 1 (to skip the case where we are passed the
  // temporary filename) and (3) we have either seen the filename
  // passed in before as an included file or we are passed the
  // main filename. Otherwise we know we are beginning an included
  // file, so we push a blank prefix on the stack, which may
  // possibly be changed later.
  if (ACE_OS::strcmp (fstring, main_filename) != 0
      && this->pragma_prefixes_.size () > 1
      && (this->seen_include_file_before (filename) != 0
          || ACE_OS::strcmp (filename, main_filename) == 0))
    {
      char *trash = 0;
      this->pragma_prefixes_.pop (trash);
      delete [] trash;
      char *current = 0;
      this->pragma_prefixes_.top (current);
      this->pd_root->prefix (current);
    }
  else
    {
      this->pragma_prefixes_.push (tmp.rep ());
      this->pd_root->prefix ((char *) tmp.fast_rep ());
    }
}

UTL_ScopedName *
IDL_GlobalData::string_to_scoped_name (char *s)
{
  char *start = s;
  int len = 0;
  UTL_ScopedName *retval = 0;

  char *end = ACE_OS::strstr (start, "::");

  while (end != 0)
    {
      len = end - start;

      if (len != 0)
        {
          char tmp[256];

          ACE_OS::strncpy (tmp,
                           start,
                           len);

          tmp[len] = '\0';

          Identifier *id = 0;
          ACE_NEW_RETURN (id,
                          Identifier (tmp),
                          0);

          if (retval == 0)
            {
              ACE_NEW_RETURN (retval,
                              UTL_ScopedName (id,
                                              0),
                              0);
            }
          else
            {
              UTL_ScopedName *conc_name = 0;
              ACE_NEW_RETURN (conc_name,
                              UTL_ScopedName (id,
                                              0),
                              0);

              retval->nconc (conc_name);
            }
        }

      start = end + 2;

      end = ACE_OS::strstr (start, "::");
    }

  end = ACE_OS::strchr (start, ' ');

  len = end - start;

  char tmp[256];

  ACE_OS::strncpy (tmp,
                   start,
                   len);

  tmp[len] = '\0';

  Identifier *id = 0;
  ACE_NEW_RETURN (id,
                  Identifier (tmp),
                  0);

  if (retval == 0)
    {
      ACE_NEW_RETURN (retval,
                      UTL_ScopedName (id,
                                      0),
                      0);
    }
  else
    {
      UTL_ScopedName *conc_name = 0;
      ACE_NEW_RETURN (conc_name,
                      UTL_ScopedName (id,
                                      0),
                      0);

      retval->nconc (conc_name);
    }

  return retval;
}

char *
IDL_GlobalData::stripped_preproc_include (const char *name)
{
  // Some preprocessors prepend "./" to filenames in the
  // working directory, some others prepend ".\". If either
  // of these are here, we want to strip them. Since we also
  // know we're in the working directory, we can skip the
  // command line prefix iteration.
  if (name[0] == '.')
    {
      if (name[1] == '\\' || name[1] == '/')
        {
          return (char *)name + 2;
        }
    }

  ssize_t cursor = this->idl_flags_.find ("-I", 0);
  ACE_CString c_name (name, 0, 0);
  ssize_t start = 0;
  ssize_t end = 0;
  char *candidate = 0;

  while (cursor != ACE_SString::npos)
    {
      // Skip over the "-I".
      start = cursor + 2;

      // If the "-I" is followed by a space. skip that too.
      if (this->idl_flags_[start] == ' ')
        {
          ++start;
        }

      // idl_flags_ uses ' ' as a separator.
      end = this->idl_flags_.find (' ', start);

      // If it's the last one, there won't be a space at the end.
      if (end == ACE_SString::npos)
        {
          end = this->idl_flags_.length ();
        }

      // Set the cursor for the next iteration, if any.
      cursor = this->idl_flags_.find ("-I", end);
      // If this prefix is found at the beginning of the name, strip it
      // and return it.
      if (c_name.find (this->idl_flags_.substr (start, end - start)) == 0)
        {
          // If the prefix ends in / or \, we don't need to strip the one
          // that *would* have been added for concatenation...
          char prefix_cap = this->idl_flags_[end - 1];
          size_t skip_slash = (prefix_cap != '\\' && prefix_cap != '/');
          char *rep = c_name.substr (end - start + skip_slash).rep ();

          // ...unless it's the SunCC preprocessor, which adds a / for
          // concatentation no matter what, so we check for it.
          if (rep[0] == '/')
            {
              ++rep;
            }

          // If there's more than one match in the list, we want the 
          // longest one.
          if (candidate == 0
              || ACE_OS::strlen (rep) < ACE_OS::strlen (candidate))
            {
              candidate = rep;
            }
        }
    }

  // If no prefix matches, just return the name unchanged.
  if (candidate != 0)
    {
      return candidate;
    }
  else
    {
      return (char *)name;
    }
}

