/* General functions for the WDB TUI.
   Copyright 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
   Contributed by Hewlett-Packard Company.

   This file is part of GDB.

   This program 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 of the License, or
   (at your option) any later version.

   This program 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 this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <malloc.h>
#ifdef HAVE_TERM_H
#include <term.h>
#endif
#include <signal.h>
#include <fcntl.h>
#include <termio.h>
#include <setjmp.h>
#include "defs.h"
#include "gdbcmd.h"
#include "tui.h"
#include "tuiData.h"
#include "tuiLayout.h"
#include "tuiIO.h"
#include "tuiRegs.h"
#include "tuiStack.h"
#include "tuiWin.h"
#include "tuiSourceWin.h"
#include "readline/readline.h"
#include "target.h"
#include "frame.h"
#include "breakpoint.h"
#include "inferior.h"

/* Tells whether the TUI is active or not.  */
int tui_active = 0;
static int tui_finish_init = 1;

/* Switch the output mode between TUI/standard gdb.  */
static int
tui_switch_mode (void)
{
  if (tui_active)
    {
      tui_disable ();
      rl_prep_terminal (0);

      printf_filtered ("Left the TUI mode\n");
    }
  else
    {
      rl_deprep_terminal ();
      tui_enable ();
      printf_filtered ("Entered the TUI mode\n");
    }

  /* Clear the readline in case switching occurred in middle of something.  */
  if (rl_end)
    rl_kill_text (0, rl_end);

  /* Since we left the curses mode, the terminal mode is restored to
     some previous state.  That state may not be suitable for readline
     to work correctly (it may be restored in line mode).  We force an
     exit of the current readline so that readline is re-entered and it
     will be able to setup the terminal for its needs.  By re-entering
     in readline, we also redisplay its prompt in the non-curses mode.  */
  rl_newline (1, '\n');

  /* Make sure the \n we are returning does not repeat the last command.  */
  dont_repeat ();
  return 0;
}

/* Change the TUI layout to show a next layout.
   This function is bound to CTRL-X 2.  It is intended to provide
   a functionality close to the Emacs split-window command.  We always
   show two windows (src+asm), (src+regs) or (asm+regs).  */
static int
tui_change_windows (void)
{
  if (!tui_active)
    tui_switch_mode ();

  if (tui_active)
    {
      TuiLayoutType new_layout;
      TuiRegisterDisplayType regs_type = TUI_UNDEFINED_REGS;

      new_layout = currentLayout ();

      /* Select a new layout to have a rolling layout behavior
	 with always two windows (except when undefined).  */
      switch (new_layout)
	{
	case SRC_COMMAND:
	  new_layout = SRC_DISASSEM_COMMAND;
	  break;

	case DISASSEM_COMMAND:
	  new_layout = SRC_DISASSEM_COMMAND;
	  break;

	case SRC_DATA_COMMAND:
	  new_layout = SRC_DISASSEM_COMMAND;
	  break;

	case SRC_DISASSEM_COMMAND:
	  new_layout = DISASSEM_DATA_COMMAND;
	  break;
	  
	case DISASSEM_DATA_COMMAND:
	  new_layout = SRC_DATA_COMMAND;
	  break;

	default:
	  new_layout = SRC_COMMAND;
	  break;
	}
      tuiSetLayout (new_layout, regs_type);
    }
  return 0;
}


/* Delete the second TUI window to only show one.  */
static int
tui_delete_other_windows (void)
{
  if (!tui_active)
    tui_switch_mode ();

  if (tui_active)
    {
      TuiLayoutType new_layout;
      TuiRegisterDisplayType regs_type = TUI_UNDEFINED_REGS;

      new_layout = currentLayout ();

      /* Kill one window.  */
      switch (new_layout)
	{
	case SRC_COMMAND:
	case SRC_DATA_COMMAND:
	case SRC_DISASSEM_COMMAND:
	default:
	  new_layout = SRC_COMMAND;
	  break;

	case DISASSEM_COMMAND:
	case DISASSEM_DATA_COMMAND:
	  new_layout = DISASSEM_COMMAND;
	  break;
	}
      tuiSetLayout (new_layout, regs_type);
    }
  return 0;
}

/* Initialize readline and configure the keymap for the switching
   key shortcut.  */
void
tui_initialize_readline ()
{
  rl_initialize ();

  rl_add_defun ("tui-switch-mode", tui_switch_mode, -1);
  rl_bind_key_in_map ('a', tui_switch_mode, emacs_ctlx_keymap);
  rl_bind_key_in_map ('A', tui_switch_mode, emacs_ctlx_keymap);
  rl_bind_key_in_map (CTRL ('A'), tui_switch_mode, emacs_ctlx_keymap);
  rl_bind_key_in_map ('1', tui_delete_other_windows, emacs_ctlx_keymap);
  rl_bind_key_in_map ('2', tui_change_windows, emacs_ctlx_keymap);
}

/* Enter in the tui mode (curses).
   When in normal mode, it installs the tui hooks in gdb, redirects
   the gdb output, configures the readline to work in tui mode.
   When in curses mode, it does nothing.  */
void
tui_enable (void)
{
  if (tui_active)
    return;

  /* To avoid to initialize curses when gdb starts, there is a defered
     curses initialization.  This initialization is made only once
     and the first time the curses mode is entered.  */
  if (tui_finish_init)
    {
      WINDOW *w;

      w = initscr ();
  
      cbreak ();
      noecho ();
      /*timeout (1);*/
      nodelay(w, FALSE);
      nl();
      keypad (w, TRUE);
      rl_initialize ();
      setTermHeightTo (LINES);
      setTermWidthTo (COLS);
      def_prog_mode ();

      tuiSetLocatorContent (0);
      showLayout (SRC_COMMAND);
      tuiSetWinFocusTo (srcWin);
      keypad (cmdWin->generic.handle, TRUE);
      wrefresh (cmdWin->generic.handle);
      tui_finish_init = 0;
    }
  else
    {
     /* Save the current gdb setting of the terminal.
        Curses will restore this state when endwin() is called.  */
     def_shell_mode ();
     clearok (stdscr, TRUE);
   }

  /* Install the TUI specific hooks.  */
  tui_install_hooks ();

  tui_update_variables ();
  
  tui_setup_io (1);

  tui_version = 1;
  tui_active = 1;
  refresh ();

  /* Update gdb's knowledge of its terminal.  */
  terminal_save_ours ();
}

/* Leave the tui mode.
   Remove the tui hooks and configure the gdb output and readline
   back to their original state.  The curses mode is left so that
   the terminal setting is restored to the point when we entered.  */
void
tui_disable (void)
{
  if (!tui_active)
    return;

  /* Remove TUI hooks.  */
  tui_remove_hooks ();

  /* Leave curses and restore previous gdb terminal setting.  */
  endwin ();

  /* gdb terminal has changed, update gdb internal copy of it
     so that terminal management with the inferior works.  */
  tui_setup_io (0);

  /* Update gdb's knowledge of its terminal.  */
  terminal_save_ours ();
  tui_version = 0;
  tui_active = 0;
}

/* Wrapper on top of free() to ensure that input address
   is greater than 0x0.  */
void
tuiFree (char *ptr)
{
  if (ptr != (char *) NULL)
    {
      xfree (ptr);
    }
}

/* Determine what the low address will be to display in the TUI's
   disassembly window.  This may or may not be the same as the
   low address input.  */
CORE_ADDR
tuiGetLowDisassemblyAddress (CORE_ADDR low, CORE_ADDR pc)
{
  int line;
  CORE_ADDR newLow;

  /* Determine where to start the disassembly so that the pc is about in the
     middle of the viewport.  */
  for (line = 0, newLow = pc;
       (newLow > low &&
	line < (tuiDefaultWinViewportHeight (DISASSEM_WIN,
					     DISASSEM_COMMAND) / 2));)
    {
      bfd_byte buffer[4];

      newLow -= sizeof (bfd_getb32 (buffer));
      line++;
    }

  return newLow;
}

void
strcat_to_buf (char *buf, int buflen, char *itemToAdd)
{
  if (itemToAdd != (char *) NULL && buf != (char *) NULL)
    {
      if ((strlen (buf) + strlen (itemToAdd)) <= buflen)
	strcat (buf, itemToAdd);
      else
	strncat (buf, itemToAdd, (buflen - strlen (buf)));
    }
}

#if 0
/* Solaris <sys/termios.h> defines CTRL. */
#ifndef CTRL
#define CTRL(x)         (x & ~0140)
#endif

#define FILEDES         2
#define CHK(val, dft)   (val<=0 ? dft : val)

static void
_tuiReset (void)
{
  struct termio mode;

  /*
     ** reset the teletype mode bits to a sensible state.
     ** Copied tset.c
   */
#if ! defined (USG) && defined (TIOCGETC)
  struct tchars tbuf;
#endif /* !USG && TIOCGETC */
#ifdef UCB_NTTY
  struct ltchars ltc;

  if (ldisc == NTTYDISC)
    {
      ioctl (FILEDES, TIOCGLTC, &ltc);
      ltc.t_suspc = CHK (ltc.t_suspc, CTRL ('Z'));
      ltc.t_dsuspc = CHK (ltc.t_dsuspc, CTRL ('Y'));
      ltc.t_rprntc = CHK (ltc.t_rprntc, CTRL ('R'));
      ltc.t_flushc = CHK (ltc.t_flushc, CTRL ('O'));
      ltc.t_werasc = CHK (ltc.t_werasc, CTRL ('W'));
      ltc.t_lnextc = CHK (ltc.t_lnextc, CTRL ('V'));
      ioctl (FILEDES, TIOCSLTC, &ltc);
    }
#endif /* UCB_NTTY */
#ifndef USG
#ifdef TIOCGETC
  ioctl (FILEDES, TIOCGETC, &tbuf);
  tbuf.t_intrc = CHK (tbuf.t_intrc, CTRL ('?'));
  tbuf.t_quitc = CHK (tbuf.t_quitc, CTRL ('\\'));
  tbuf.t_startc = CHK (tbuf.t_startc, CTRL ('Q'));
  tbuf.t_stopc = CHK (tbuf.t_stopc, CTRL ('S'));
  tbuf.t_eofc = CHK (tbuf.t_eofc, CTRL ('D'));
  /* brkc is left alone */
  ioctl (FILEDES, TIOCSETC, &tbuf);
#endif /* TIOCGETC */
  mode.sg_flags &= ~(RAW
#ifdef CBREAK
		     | CBREAK
#endif /* CBREAK */
		     | VTDELAY | ALLDELAY);
  mode.sg_flags |= XTABS | ECHO | CRMOD | ANYP;
#else /*USG */
  ioctl (FILEDES, TCGETA, &mode);
  mode.c_cc[VINTR] = CHK (mode.c_cc[VINTR], CTRL ('?'));
  mode.c_cc[VQUIT] = CHK (mode.c_cc[VQUIT], CTRL ('\\'));
  mode.c_cc[VEOF] = CHK (mode.c_cc[VEOF], CTRL ('D'));

  mode.c_iflag &= ~(IGNBRK | PARMRK | INPCK | INLCR | IGNCR | IUCLC | IXOFF);
  mode.c_iflag |= (BRKINT | ISTRIP | ICRNL | IXON);
  mode.c_oflag &= ~(OLCUC | OCRNL | ONOCR | ONLRET | OFILL | OFDEL |
		    NLDLY | CRDLY | TABDLY | BSDLY | VTDLY | FFDLY);
  mode.c_oflag |= (OPOST | ONLCR);
  mode.c_cflag &= ~(CSIZE | PARODD | CLOCAL);
#ifndef hp9000s800
  mode.c_cflag |= (CS8 | CREAD);
#else /*hp9000s800 */
  mode.c_cflag |= (CS8 | CSTOPB | CREAD);
#endif /* hp9000s800 */
  mode.c_lflag &= ~(XCASE | ECHONL | NOFLSH);
  mode.c_lflag |= (ISIG | ICANON | ECHO | ECHOK);
  ioctl (FILEDES, TCSETAW, &mode);
#endif /* USG */

  return;
}				/* _tuiReset */
#endif

void
tui_show_source (const char *file, int line)
{
  /* make sure that the source window is displayed */
  tuiAddWinToLayout (SRC_WIN);

  tuiUpdateSourceWindowsWithLine (current_source_symtab, line);
  tuiUpdateLocatorFilename (file);
}

void
tui_show_assembly (CORE_ADDR addr)
{
  tuiAddWinToLayout (DISASSEM_WIN);
  tuiUpdateSourceWindowsWithAddr (addr);
}

int
tui_is_window_visible (TuiWinType type)
{
  if (tui_version == 0)
    return 0;

  if (winList[type] == 0)
    return 0;
  
  return winList[type]->generic.isVisible;
}

int
tui_get_command_dimension (int *width, int *height)
{
  if (!tui_version || !m_winPtrNotNull (cmdWin))
    {
      return 0;
    }
  
  *width = cmdWin->generic.width;
  *height = cmdWin->generic.height;
  return 1;
}