// drv_preproc_ifr.cpp,v 1.12 2002/08/28 20:02:37 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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*/

// Pass an IDL file through the C preprocessor

#include "drv_extern_ifr.h"
#include "be_global.h"
#include "be_extern.h"

#include "idl_bool.h"
#include "idl_defines.h"
#include "global_extern.h"
#include "fe_extern.h"
#include "utl_string.h"
#include "ace/Process_Manager.h"
#include "ace/SString.h"
#include "ace/Env_Value_T.h"
#include "ace/ARGV.h"

ACE_RCSID (IFR_Service, 
           drv_preproc_ifr, 
           "drv_preproc_ifr.cpp,v 1.12 2002/08/28 20:02:37 parsons Exp")

static long argcount = 0;
static long max_argcount = 128;
static const char *arglist[128];
static const char *output_arg_format = 0;
static long output_arg_index = 0;

// Push the new CPP location if we got a -Yp argument
void
DRV_cpp_new_location (const char *new_loc)
{
  arglist[0] = new_loc;
}

// Push an argument into the arglist
void
DRV_cpp_putarg (const char *str)
{
  if (argcount >= max_argcount) 
    {
      ACE_ERROR ((LM_ERROR,
                  "%s%s %d %s\n",
                  idl_global->prog_name (),
                  ACE_TEXT (": More than"),
                  max_argcount,
                  ACE_TEXT ("arguments to preprocessor")));

      ACE_OS::exit (99);
    }

  arglist[argcount++] = ACE::strnew (str);
}

// Expand the output argument with the given filename.
void
DRV_cpp_expand_output_arg (const char *filename)
{
  if (output_arg_format != 0)
    {
      delete [] ACE_const_cast (char *, arglist[output_arg_index]);
      arglist[output_arg_index] = 0; 

      char *output_arg = 0;
      ACE_NEW (output_arg,
               char [ACE_OS::strlen (output_arg_format)
                     + ACE_OS::strlen (filename)
                     + 1]);

      ACE_OS::sprintf (output_arg,
                       output_arg_format,
                       filename);

      arglist[output_arg_index] = output_arg;
    }
}

// Initialize the cpp argument list.
void
DRV_cpp_init (void)
{
  // @@ There are two "one time" memory leaks in this function.
  //    They will not blow off the program but should be fixed at some point.
  const char *cpp_loc; 
  const char *cpp_args;

  // See if TAO_IDL_PREPROCESSOR is defined.

  ACE_Env_Value<char*> preprocessor ("TAO_IDL_PREPROCESSOR", (char *) 0);

  // Set cpp_loc to the built in location, unless it has been overriden by
  // environment variables.

  if (preprocessor != 0)
    {
      cpp_loc = preprocessor;
    }
  else
    {
      // Check for the deprecated CPP_LOCATION environment variable
      ACE_Env_Value<char*> cpp_path ("CPP_LOCATION", (char *) 0);
      if (cpp_path != 0)
        {
          ACE_ERROR ((LM_ERROR,
                      ACE_TEXT ("Warning: The environment variable ")
                      ACE_TEXT ("CPP_LOCATION has been deprecated.\n")
                      ACE_TEXT ("         Please use TAO_IDL_PREPROCESSOR ")
                      ACE_TEXT ("instead.\n")));

          cpp_loc = cpp_path;
        }
      else
        {
          cpp_loc = idl_global->cpp_location ();
        }
    }

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

  // Added some customizable preprocessor options

  ACE_Env_Value<char*> args1 ("TAO_IDL_PREPROCESSOR_ARGS", (char *) 0);

  if (args1 != 0)
    {
      cpp_args = args1;
    }
  else
    {
      // Check for the deprecated TAO_IDL_DEFAULT_CPP_FLAGS environment variable
      ACE_Env_Value<char*> args2 ("TAO_IDL_DEFAULT_CPP_FLAGS", (char *) 0);
      if (args2 != 0)
        {
          ACE_ERROR ((LM_ERROR,
                      "%s%s%s%s%s",
                      ACE_TEXT ("Warning: The environment variable "),
                      ACE_TEXT ("TAO_IDL_DEFAULT_CPP_FLAGS has been "),
                      ACE_TEXT ("deprecated.\n"),
                      ACE_TEXT ("         Please use "),
                      ACE_TEXT ("TAO_IDL_PREPROCESSOR_ARGS instead.\n")));

          cpp_args = args2;
        }
      else
        {
          // If no cpp flag was defined by the user, we define some
          // platform specific flags here.
          char option[BUFSIZ];

#if defined (TAO_IDL_PREPROCESSOR_ARGS)
          cpp_args = TAO_IDL_PREPROCESSOR_ARGS;
#elif defined (ACE_CC_PREPROCESSOR_ARGS)
          cpp_args = ACE_CC_PREPROCESSOR_ARGS;
#else
          cpp_args = "-E";
#endif /* TAO_IDL_PREPROCESSOR_ARGS */

          // So we can find OMG IDL files, such as `orb.idl'.
          ACE_OS::strcpy (option, "-I");

#if defined (TAO_IDL_INCLUDE_DIR)
          // TAO_IDL_INCLUDE_DIR should be in quotes,
          // e.g. "/usr/local/include/tao"

          ACE_OS::strcat (option, TAO_IDL_INCLUDE_DIR);
#else
          const char* TAO_ROOT = ACE_OS::getenv ("TAO_ROOT");
          
          if (TAO_ROOT != 0)
            {
              ACE_OS::strcat (option, TAO_ROOT);
              ACE_OS::strcat (option, "/tao");
            }
          else
            {
              const char* ACE_ROOT = ACE_OS::getenv ("ACE_ROOT");

              if (ACE_ROOT != 0)
                {
                  ACE_OS::strcat (option, ACE_ROOT);
                  ACE_OS::strcat (option, "/TAO/tao");
                }
              else
                {
                  ACE_ERROR ((
                      LM_ERROR,
                      "%s%s%s%s",
                      ACE_TEXT ("Note: The environment variables "),
                      ACE_TEXT ("TAO_ROOT and ACE_ROOT are not defined.\n"),
                      ACE_TEXT ("      TAO_IDL may not be able to "),
                      ACE_TEXT ("locate orb.idl\n")
                    ));

                  ACE_OS::strcat (option, ".");
                }
            }
#endif  /* TAO_IDL_INCLUDE_DIR */

          DRV_cpp_putarg (option);
      }
  }

  // Add any flags in cpp_args to cpp's arglist.
  ACE_ARGV arglist (cpp_args);

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

// Lines can be 1024 chars long.
#define LINEBUF_SIZE    1024
static  char    drv_line[LINEBUF_SIZE + 1];

// Get a line from stdin
static long
DRV_get_line (FILE *f)
{
    char *l = fgets (drv_line, 
                     LINEBUF_SIZE, 
                     f);
    long i = 0;

    if (l == NULL)
      {
        return I_FALSE;
      }

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

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

    i = strlen(l) - 1;

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

    return I_TRUE;
}

// Copy from stdin to a file
static void
DRV_copy_input (FILE *fin, 
                char *fn, 
                const char *orig_filename)
{
  FILE  *f = ACE_OS::fopen (fn, "w");

  if (f == NULL) 
    {
      ACE_ERROR ((LM_ERROR,
                  "%s%s%s%s",
                  idl_global->prog_name (),
                  ACE_TEXT (": cannot open temp file "),
                  fn,
                  ACE_TEXT (" for writing\n")));

      ACE_OS::exit (99);
    }

  if (fin == NULL) 
    {
      ACE_ERROR ((LM_ERROR,
                  "%s%s",
                  idl_global->prog_name (),
                  ACE_TEXT (": cannot open input file\n")));

      ACE_OS::exit (99);
    }

#if !defined (ACE_WIN32)
  fprintf (f, 
           "#line 1 \"%s\"\n", 
           orig_filename);
#else
  // Convert single \ into double \ otherwise MSVC++ pre-processor
  // gets awfully confused.
  char buf[2*MAXPATHLEN];
  char *d = buf;

  for (const char *s = orig_filename; *s != 0; ++s)
    {
      if (*s == '\\')
        {
          *d = '\\';
          d++;
        }

      *d = *s;
      d++;
    }

  *d = 0;
  ACE_OS::fprintf (f, 
                   "#line 1 \"%s\"\n", 
                   buf);
#endif /* ! ACE_WIN32 */

  while (DRV_get_line (fin))
    {
      // 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);

      // Print the line to the temp file.
      ACE_OS::fprintf (f, 
                       "%s\n", 
                       drv_line);
    }

  // Close the temp file.
  ACE_OS::fclose (f);
}

// 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;
    long        l;

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

    l = 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;
}

// File names
static char     tmp_file[128];
static char     tmp_ifile[128];

// Pass input through preprocessor
void
DRV_pre_proc (const char *myfile)
{
  long  readfromstdin = I_FALSE;

  // Macro to avoid "warning: unused parameter" type warning.
  ACE_UNUSED_ARG (readfromstdin);

  const char* tmpdir = idl_global->temp_dir ();

  ACE_OS::strcpy (tmp_file, tmpdir);
  ACE_OS::strcpy (tmp_ifile, tmpdir);

  ACE_OS::strcat (tmp_file, "idlf_XXXXXX");
  ACE_OS::strcat (tmp_ifile, "idli_XXXXXX");

  (void) ACE_OS::mktemp (tmp_file); ACE_OS::strcat (tmp_file, ".cc");
  (void) ACE_OS::mktemp (tmp_ifile); ACE_OS::strcat (tmp_ifile, ".cc");

  UTL_String *tmp = 0;

  be_global->filename (ACE_const_cast (char *, myfile));

  if (strcmp (myfile, "standard input") == 0)
    {
      ACE_NEW (tmp,
               UTL_String (tmp_ifile));
      idl_global->set_filename (tmp);

      ACE_NEW (tmp,
               UTL_String (tmp_ifile));
      idl_global->set_main_filename (tmp);

      ACE_NEW (tmp,
               UTL_String (DRV_stripped_name (tmp_ifile)));
      idl_global->set_stripped_filename (tmp);

      ACE_NEW (tmp,
               UTL_String (tmp_ifile));
      idl_global->set_real_filename (tmp);

      DRV_copy_input (stdin, 
                      tmp_ifile, 
                      "standard input");

      idl_global->set_read_from_stdin (I_TRUE);
    }
  else
    {
      FILE *fd = fopen (myfile, "r");
      DRV_copy_input (fd, 
                      tmp_ifile, 
                      myfile);
      fclose (fd);

      idl_global->set_read_from_stdin (I_FALSE);

      ACE_NEW (tmp,
               UTL_String (myfile));
      idl_global->set_filename (tmp);

      ACE_NEW (tmp,
               UTL_String (myfile));
      idl_global->set_main_filename (tmp);

      ACE_Auto_String_Free safety (ACE_OS::strdup (myfile));
      ACE_NEW (tmp,
               UTL_String (DRV_stripped_name (safety.get ())));
      idl_global->set_stripped_filename (tmp);

      ACE_NEW (tmp,
               UTL_String (tmp_ifile));
      idl_global->set_real_filename (tmp);
    }

  // We use ACE instead of the (low level) fork facilities, this also
  // works on NT.
  ACE_Process process;

  // For complex builds, the default command line buffer size of 1024
  // is sometimes not enough. We use 4096 here.
  ACE_Process_Options cpp_options (1,       // Inherit environment.
                                   TAO_IDL_COMMAND_LINE_BUFFER_SIZE);

  DRV_cpp_expand_output_arg (tmp_file);
  DRV_cpp_putarg (tmp_ifile);
  DRV_cpp_putarg (0); // Null terminate the arglist.

  cpp_options.command_line (arglist);
  
  /// Remove any existing output file.
  (void) ACE_OS::unlink (tmp_file);

  ACE_HANDLE fd = ACE_INVALID_HANDLE;

  if (output_arg_format == 0)
    {
      // If the following open() fails, then we're either being hit with a
      // symbolic link attack, or another process opened the file before
      // us.
      fd = ACE_OS::open (tmp_file,
                         O_WRONLY | O_CREAT | O_EXCL,
                         ACE_DEFAULT_FILE_PERMS);

      if (fd == ACE_INVALID_HANDLE)
        {
          ACE_ERROR ((LM_ERROR,
                      "%s%s%s%s",
                      idl_global->prog_name (),
                      ACE_TEXT (": cannot open temp file "),
                      tmp_file,
                      ACE_TEXT (" for writing\n")));

          return;
        }

      cpp_options.set_handles (ACE_INVALID_HANDLE, fd);
    }

  if (process.spawn (cpp_options) == ACE_INVALID_PID)
    {
      ACE_ERROR ((LM_ERROR,
                  "%s%s%s%s",
                  idl_global->prog_name (),
                  ACE_TEXT (": spawn of "),
                  arglist[0],
                  ACE_TEXT (" failed\n")));

      return;
    }

  if (fd != ACE_INVALID_HANDLE)
    {
      // Close the output file on the parent process.
      if (ACE_OS::close (fd) == -1)
        {
          ACE_ERROR ((LM_ERROR,
                      "%s%s%s%s",
                      idl_global->prog_name (),
                      ACE_TEXT (": cannot close temp file"),
                      tmp_file,
                      ACE_TEXT (" on parent\n")));

          return;
        }
    }

  // Remove the null termination and the input file from the arglist,
  // the next file will the previous args.
  argcount -= 2;

  ACE_exitcode status = 0;
  if (process.wait (&status) == ACE_INVALID_PID)
    {
      ACE_ERROR ((LM_ERROR,
                  "%s%s",
                  idl_global->prog_name (),
                  ACE_TEXT (": wait for child process failed\n")));

      return;
    }

  if (WIFEXITED ((status)))
    {
      // child terminated normally?
      if (WEXITSTATUS ((status)) != 0)
        {
          errno = WEXITSTATUS ((status));

          ACE_ERROR ((LM_ERROR,
                      "%s%s%s%s",
                      idl_global->prog_name (),
                      ACE_TEXT (": preprocessor "),
                      arglist[0],
                      ACE_TEXT (" returned with an error\n")));

          ACE_OS::exit (1);
        }
    }
  else
    {
      // child didn't call exit(); perhaps it received a signal?
      errno = EINTR;

      ACE_ERROR ((LM_ERROR,
                  "%s%s%s%s",
                  idl_global->prog_name (),
                  ACE_TEXT (": preprocessor "),
                  arglist[0],
                  ACE_TEXT (" appears to have been interrupted\n")));

      ACE_OS::exit (1);
    }
  // TODO: Manage problems in the pre-processor, in the previous
  // version the current process would exit if the pre-processor
  // returned with error.

  FILE *yyin = ACE_OS::fopen (tmp_file, "r");

  if (yyin == NULL) 
    {
      ACE_ERROR ((LM_ERROR,
                  "%s%s %s\n",
                  idl_global->prog_name (),
                  ACE_TEXT (": Could not open cpp output file"),
                  tmp_file));

      ACE_OS::exit (99);
    }

  FE_set_yyin (ACE_reinterpret_cast (File *, yyin));

  if (idl_global->compile_flags() & IDL_CF_ONLY_PREPROC) 
    {
      FILE *preproc = ACE_OS::fopen (tmp_file, "r");
      char buffer[ACE_MAXLOGMSGLEN];
      int bytes;

      if (preproc == NULL)
        {
          ACE_ERROR ((LM_ERROR,
                      "%s: Could not open cpp output file: %s\n",
                      idl_global->prog_name (),
                      tmp_file));

          ACE_OS::exit (99);
        }

      // 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);

      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);
  }

  if (ACE_OS::unlink (tmp_ifile) == -1) 
    {
      ACE_ERROR ((LM_ERROR,
                  "%s%s %s\n",
                  idl_global->prog_name (),
                  ACE_TEXT (": Could not remove cpp input file"),
                  tmp_ifile));

      ACE_OS::exit (99);
    }

#if !defined (ACE_WIN32) || defined (ACE_HAS_WINNT4) && (ACE_HAS_WINNT4 != 0)
  if (ACE_OS::unlink (tmp_file) == -1) 
    {
      ACE_ERROR ((LM_ERROR,
                  "%s%s %s\n",
                  idl_global->prog_name (),
                  ACE_TEXT (": Could not remove cpp output file"),
                  tmp_file));

      ACE_OS::exit (99);
    }
#endif /* ACE_HAS_WINNT4 && ACE_HAS_WINNT4 != 0 */

  if (idl_global->compile_flags() & IDL_CF_ONLY_PREPROC)
    {
      ACE_OS::exit (0);
    }
}

// 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 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.
  const char* include_str = "include";

  for (size_t ii = 0; 
       ii < strlen ("include") && *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;

  // Found this in idl.ll. Decides the file to be standard input.
  if (*h == '\0')
    {
      return;
    }

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

  // Make a new string for this file name.
  char* file_name = 0;
  ACE_NEW (file_name,
           char [r - h + 1]);

  // Copy the char's.
  size_t fi = 0;

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

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

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

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

      file_name [i] = file_name [j];
    }

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

  // Store in the idl_global, unless it's "orb.idl" -
  // we don't want to generate header includes for that.
  if (ACE_OS::strcmp (file_name, "orb.idl"))
    {
      idl_global->add_to_included_idl_files (file_name);
    }
}

#if defined (ACE_HAS_EXPLICIT_TEMPLATE_INSTANTIATION)
  template class ACE_Env_Value<char*>;
#elif defined (ACE_HAS_TEMPLATE_INSTANTIATION_PRAGMA)
# pragma instantiate  ACE_Env_Value<char*>
#endif
