--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/toplev.cc	Sat Dec 30 03:46:07 1995 +0000
@@ -0,0 +1,680 @@
+// toplev.cc                                            -*- C++ -*-
+/*
+
+Copyright (C) 1992, 1993, 1994, 1995 John W. Eaton
+
+This file is part of Octave.
+
+Octave is free software; you can redistribute it and/or modify it
+under the terms of the GNU General Public License as published by the
+Free Software Foundation; either version 2, or (at your option) any
+later version.
+
+Octave is distributed in the hope that it will be useful, but WITHOUT
+ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+for more details.
+
+You should have received a copy of the GNU General Public License
+along with Octave; see the file COPYING.  If not, write to the Free
+Software Foundation, 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+
+*/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <cassert>
+#include <csetjmp>
+#include <csignal>
+#include <cstdlib>
+#include <cstring>
+#include <ctime>
+
+#include <fstream.h>
+#include <iostream.h>
+#include <strstream.h>
+
+#ifdef HAVE_UNISTD_H
+#include <sys/types.h>
+#include <unistd.h>
+#endif
+
+#include <pwd.h>
+
+#include <readline/tilde.h>
+
+#include "lo-error.h"
+
+#include "builtins.h"
+#include "defaults.h"
+#include "defun.h"
+#include "dynamic-ld.h"
+#include "error.h"
+#include "file-io.h"
+#include "help.h"
+#include "input.h"
+#include "lex.h"
+#include "octave-hist.h"
+#include "toplev.h"
+#include "pager.h"
+#include "parse.h"
+#include "pathsearch.h"
+#include "procstream.h"
+#include "sighandlers.h"
+#include "statdefs.h"
+#include "sysdep.h"
+#include "tree-const.h"
+#include "tree-misc.h"
+#include "tree-plot.h"
+#include "unwind-prot.h"
+#include "user-prefs.h"
+#include "utils.h"
+#include "variables.h"
+#include "version.h"
+
+#if !defined (HAVE_ATEXIT) && defined (HAVE_ON_EXIT)
+extern "C" int on_exit ();
+#define atexit on_exit
+#endif
+
+// argv[0] for this program.
+char *raw_prog_name = 0;
+
+// Cleaned-up name of this program, not including path information.
+char *prog_name = 0;
+
+// Login name for user running this program.
+char *user_name = 0;
+
+// Name of the host we are running on.
+char *host_name = 0;
+
+// User's home directory.
+char *home_directory = 0;
+
+// Guess what?
+char *the_current_working_directory = 0;
+
+// The path that will be searched for programs that we execute.
+// (--exec-path path)
+char *exec_path = 0;
+
+// Load path specified on command line.
+// (--path path; -p path)
+char *load_path = 0;
+
+// Name of the info file specified on command line.
+// (--info-file file)
+char *info_file = 0;
+
+// Name of the info reader we'd like to use.
+// (--info-program program)
+char *info_prog = 0;
+
+// Name of the editor to be invoked by the edit_history command.
+char *editor = 0;
+
+// If nonzero, don't do fancy line editing.
+int no_line_editing = 0;
+
+// If nonzero, print verbose info in some cases.
+// (--verbose; -V)
+int verbose_flag = 0;
+
+// Nonzero means we printed messages about reading startup files.
+int reading_startup_message_printed = 0;
+
+// Command number, counting from the beginning of this session.
+int current_command_number = 1;
+
+// Nonzero means we are exiting via the builtin exit or quit functions.
+int quitting_gracefully = 0;
+
+// Current command to execute.
+tree_statement_list *global_command = 0;
+
+// Pointer to function that is currently being evaluated.
+tree_function *curr_function = 0;
+
+// Nonzero means input is coming from startup file.
+int input_from_startup_file = 0;
+
+// The command-line options.
+charMatrix octave_argv;
+
+// Nonzero means that input is coming from a file that was named on
+// the command line.
+int input_from_command_line_file = 1;
+
+void
+parse_and_execute (FILE *f, int print)
+{
+  begin_unwind_frame ("parse_and_execute");
+  
+  YY_BUFFER_STATE old_buf = current_buffer ();
+  YY_BUFFER_STATE new_buf = create_buffer (f);
+
+  add_unwind_protect (restore_input_buffer, (void *) old_buf);
+  add_unwind_protect (delete_input_buffer, (void *) new_buf);
+
+  switch_to_buffer (new_buf);
+
+  unwind_protect_int (using_readline);
+  unwind_protect_int (input_from_command_line_file);
+
+  using_readline = 0;
+  input_from_command_line_file = 0;
+
+  unwind_protect_ptr (curr_sym_tab);
+
+  int retval;
+  do
+    {
+      reset_parser ();
+
+      retval = yyparse ();
+
+      if (retval == 0 && global_command)
+	{
+	  global_command->eval (print);
+	  delete global_command;
+	}
+    }
+  while (retval == 0);
+
+  run_unwind_frame ("parse_and_execute");
+}
+
+void
+parse_and_execute (const char *s, int print, int verbose,
+		   const char *warn_for)
+{
+  begin_unwind_frame ("parse_and_execute_2");
+
+  unwind_protect_int (reading_script_file);
+  unwind_protect_ptr (curr_fcn_file_full_name);
+
+  reading_script_file = 1;
+  curr_fcn_file_full_name = s;
+
+  FILE *f = get_input_from_file (s, 0);
+  if (f)
+    {
+      unwind_protect_int (input_line_number);
+      unwind_protect_int (current_input_column);
+
+      input_line_number = 0;
+      current_input_column = 1;
+
+      if (verbose)
+	{
+	  cout << "reading commands from " << s << " ... ";
+	  reading_startup_message_printed = 1;
+	  cout.flush ();
+	}
+
+      parse_and_execute (f, print);
+
+      fclose (f);
+
+      if (verbose)
+	cout << "done." << endl;
+    }
+  else if (warn_for)
+    error ("%s: unable to open file `%s'", warn_for, s);
+
+  run_unwind_frame ("parse_and_execute_2");
+}
+
+DEFUN ("source", Fsource, Ssource, 10,
+  "source (FILE)\n\
+\n\
+Parse and execute the contents of FILE.  Like executing commands in a\n\
+script file but without requiring the file to be named `FILE.m'.")
+{
+  Octave_object retval;
+
+  int nargin = args.length ();
+
+  if (nargin == 1)
+    {
+      const char *file = args(0).string_value ();
+
+      if (! error_state)
+	{
+	  file = tilde_expand (file);
+
+	  parse_and_execute (file, 1, 0, "source");
+
+	  if (error_state)
+	    error ("source: error sourcing file `%s'", file);
+
+	  delete [] file;
+	}
+      else
+	error ("source: expecting file name as argument");
+    }
+  else
+    print_usage ("source");
+
+  return retval;
+}
+
+// Fix up things before exiting.
+
+void
+clean_up_and_exit (int retval)
+{
+  raw_mode (0);
+
+  clean_up_history ();
+
+  close_plot_stream ();
+
+  close_diary_file ();
+
+  close_files ();
+
+  cleanup_tmp_files ();
+
+  if (!quitting_gracefully && (interactive || forced_interactive))
+    cout << "\n";
+
+  if (retval == EOF)
+    retval = 0;
+
+  exit (retval);
+
+  // This is bogus but should prevent g++ from giving a warning saying
+  // that this volatile function does return.
+
+  panic_impossible ();
+}
+
+DEFUN_TEXT ("casesen", Fcasesen, Scasesen, 10,
+  "casesen [on|off]")
+{
+  Octave_object retval;
+
+  DEFINE_ARGV("casesen");
+
+  if (argc == 1 || (argc > 1 && strcmp (argv[1], "off") == 0))
+    warning ("casesen: sorry, Octave is always case sensitive");
+  else if (argc > 1 && strcmp (argv[1], "on") == 0)
+    ; // ok.
+  else
+    print_usage ("casesen");
+
+  DELETE_ARGV;
+
+  return retval;
+}
+
+DEFUN ("computer", Fcomputer, Scomputer, 11,
+  "computer ():\n\
+\n\
+Have Octave ask the system, \"What kind of computer are you?\"")
+{
+  Octave_object retval;
+
+  int nargin = args.length ();
+
+  if (nargin != 0)
+    warning ("computer: ignoring extra arguments");
+
+  ostrstream output_buf;
+
+  if (strcmp (TARGET_HOST_TYPE, "unknown") == 0)
+    output_buf << "Hi Dave, I'm a HAL-9000";
+  else
+    output_buf << TARGET_HOST_TYPE;
+
+  if (nargout == 0)
+    {
+      output_buf << "\n" << ends;
+      maybe_page_output (output_buf);
+    }
+  else
+    {
+      output_buf << ends;
+      char *msg = output_buf.str ();
+      retval = msg;
+      delete [] msg;
+    }
+
+  return retval;
+}
+
+DEFUN ("flops", Fflops, Sflops, 10,
+  "flops (): count floating point operations")
+{
+  int nargin = args.length ();
+
+  if (nargin > 0)
+    print_usage ("flops");
+
+  warning ("flops is a flop, always returning zero");
+
+  return 0.0;
+}
+
+DEFUN ("quit", Fquit, Squit, 00,
+  "quit (): exit Octave gracefully")
+{
+  Octave_object retval;
+  quitting_gracefully = 1;
+  clean_up_and_exit (0);
+  return retval;
+}
+
+DEFALIAS (exit, quit);
+
+DEFUN ("warranty", Fwarranty, Swarranty, 00,
+  "warranty (): describe copying conditions")
+{
+  Octave_object retval;
+
+  ostrstream output_buf;
+  output_buf << "\n" OCTAVE_NAME_VERSION_AND_COPYRIGHT "\n\n\
+This program is free software; you can redistribute it and/or modify\n\
+it under the terms of the GNU General Public License as published by\n\
+the Free Software Foundation; either version 2 of the License, or\n\
+(at your option) any later version.\n\
+\n\
+This program is distributed in the hope that it will be useful,\n\
+but WITHOUT ANY WARRANTY; without even the implied warranty of\n\
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n\
+GNU General Public License for more details.\n\
+\n\
+You should have received a copy of the GNU General Public License\n\
+along with this program. If not, write to the Free Software\n\
+Foundation, 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.\n\
+\n";
+
+  output_buf << ends;
+  maybe_page_output (output_buf);
+
+  return retval;
+}
+
+// XXX FIXME XXX -- this may not be the best place for these...
+
+Octave_object
+feval (const Octave_object& args, int nargout)
+{
+  Octave_object retval;
+
+  tree_fvc *fcn = is_valid_function (args(0), "feval", 1);
+  if (fcn)
+    {
+      int tmp_nargin = args.length () - 1;
+      Octave_object tmp_args;
+      tmp_args.resize (tmp_nargin);
+      for (int i = 0; i < tmp_nargin; i++)
+	tmp_args(i) = args(i+1);
+      retval = fcn->eval (0, nargout, tmp_args);
+    }
+
+  return retval;
+}
+
+DEFUN ("feval", Ffeval, Sfeval, 11,
+  "feval (NAME, ARGS, ...)\n\
+\n\
+evaluate NAME as a function, passing ARGS as its arguments")
+{
+  Octave_object retval;
+
+  int nargin = args.length ();
+
+  if (nargin > 0)
+    retval = feval (args, nargout);
+  else
+    print_usage ("feval");
+
+  return retval;
+}
+
+static Octave_object
+eval_string (const char *string, int print, int& parse_status,
+	     int nargout) 
+{
+  begin_unwind_frame ("eval_string");
+
+  unwind_protect_int (get_input_from_eval_string);
+  unwind_protect_int (input_from_command_line_file);
+  unwind_protect_ptr (global_command);
+  unwind_protect_ptr (current_eval_string);
+
+  get_input_from_eval_string = 1;
+  input_from_command_line_file = 0;
+  current_eval_string = string;
+
+  YY_BUFFER_STATE old_buf = current_buffer ();
+  YY_BUFFER_STATE new_buf = create_buffer (0);
+
+  add_unwind_protect (restore_input_buffer, (void *) old_buf);
+  add_unwind_protect (delete_input_buffer, (void *) new_buf);
+
+  switch_to_buffer (new_buf);
+
+  unwind_protect_ptr (curr_sym_tab);
+
+  reset_parser ();
+
+  parse_status = yyparse ();
+
+  // Important to reset the idea of where input is coming from before
+  // trying to eval the command we just parsed -- it might contain the
+  // name of an function file that still needs to be parsed!
+
+  tree_statement_list *command = global_command;
+
+  run_unwind_frame ("eval_string");
+
+  Octave_object retval;
+
+  if (parse_status == 0 && command)
+    {
+      retval = command->eval (print, nargout);
+      delete command;
+    }
+
+  return retval;
+}
+
+tree_constant
+eval_string (const char *string, int print, int& parse_status)
+{
+  tree_constant retval;
+
+  Octave_object tmp = eval_string (string, print, parse_status, 1);
+
+  retval = tmp(0);
+
+  return retval;
+}
+
+static Octave_object
+eval_string (const tree_constant& arg, int& parse_status, int nargout)
+{
+  const char *string = arg.string_value ();
+
+  if (error_state)
+    {
+      error ("eval: expecting string argument");
+      return -1.0;
+    }
+
+  // Yes Virginia, we always print here...
+
+  return eval_string (string, 1, parse_status, nargout);
+}
+
+DEFUN ("eval", Feval, Seval, 11,
+  "eval (TRY, CATCH)\n\
+\n\
+Evaluate the string TRY as octave code.  If that fails, evaluate the\n\
+string CATCH.")
+{
+  Octave_object retval;
+
+  int nargin = args.length ();
+
+  if (nargin > 0)
+    {
+      begin_unwind_frame ("Feval");
+
+      if (nargin > 1)
+	{
+	  unwind_protect_int (buffer_error_messages);
+	  buffer_error_messages = 1;
+	}
+
+      int parse_status = 0;
+
+      retval = eval_string (args(0), parse_status, nargout);
+
+      if (nargin > 1 && (parse_status != 0 || error_state))
+	{
+	  error_state = 0;
+
+	  // Set up for letting the user print any messages from
+	  // errors that occurred in the first part of this eval().
+
+	  buffer_error_messages = 0;
+	  bind_global_error_variable ();
+	  add_unwind_protect (clear_global_error_variable, 0);
+
+	  eval_string (args(1), parse_status, nargout);
+
+	  retval = Octave_object ();
+	}
+
+      run_unwind_frame ("Feval");
+    }
+  else
+    print_usage ("eval");
+
+  return retval;
+}
+
+// Execute a shell command.
+
+DEFUN ("system", Fsystem, Ssystem, 11,
+  "system (string [, return_output]): execute shell commands")
+{
+  Octave_object retval;
+
+  int nargin = args.length ();
+
+  if (nargin < 1 || nargin > 2)
+    {
+      print_usage ("system");
+      return retval;
+    }
+
+  tree_constant tc_command = args(0);
+
+  const char *tmp_str = tc_command.string_value ();
+
+  if (error_state)
+    {
+      error ("system: expecting string as first argument");
+    }
+  else
+    {
+      iprocstream *cmd = new iprocstream (tmp_str);
+
+      add_unwind_protect (cleanup_iprocstream, cmd);
+
+      int status = 127;
+
+      if (cmd && *cmd)
+	{
+	  ostrstream output_buf;
+
+	  char ch;
+	  while (cmd->get (ch))
+	    output_buf.put (ch);
+
+	  output_buf << ends;
+
+	  status = cmd->close ();
+
+	  // The value in status is as returned by waitpid.  If the
+	  // process exited normally, extract the actual exit status of
+	  // the command.  Otherwise, return 127 as a failure code.
+
+	  if ((status & 0xff) == 0)
+	    status = (status & 0xff00) >> 8;
+
+	  if (nargout > 0 || nargin > 1)
+	    {
+	      char *msg = output_buf.str ();
+
+	      retval(1) = (double) status;
+	      retval(0) = msg;
+
+	      delete [] msg;
+	    }
+	  else
+	    maybe_page_output (output_buf);
+	}
+      else
+	error ("unable to start subprocess for `%s'", tmp_str);
+
+      run_unwind_protect ();
+    }
+
+  return retval;
+}
+
+DEFALIAS (shell_cmd, system);
+
+#if defined (__GNUG__) && defined (DEBUG_NEW_DELETE)
+int debug_new_delete = 0;
+
+typedef void (*vfp)(void);
+extern vfp __new_handler;
+
+void *
+__builtin_new (size_t sz)
+{
+  void *p;
+
+  /* malloc (0) is unpredictable; avoid it.  */
+  if (sz == 0)
+    sz = 1;
+  p = (void *) malloc (sz);
+  while (p == 0)
+    {
+      (*__new_handler) ();
+      p = (void *) malloc (sz);
+    }
+
+  if (debug_new_delete)
+    cout << "__builtin_new: " << p << endl;
+
+  return p;
+}
+
+void
+__builtin_delete (void *ptr)
+{
+  if (debug_new_delete)
+    cout << "__builtin_delete: " << ptr << endl;
+
+  if (ptr)
+    free (ptr);
+}
+#endif
+
+/*
+;;; Local Variables: ***
+;;; mode: C++ ***
+;;; page-delimiter: "^/\\*" ***
+;;; End: ***
+*/