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screen.c

/*
 * Copyright (C) 1984-2005  Mark Nudelman
 *
 * You may distribute under the terms of either the GNU General Public
 * License or the Less License, as specified in the README file.
 *
 * For more information about less, or for information on how to 
 * contact the author, see the README file.
 */


/*
 * Routines which deal with the characteristics of the terminal.
 * Uses termcap to be as terminal-independent as possible.
 */

#include "less.h"
#include "cmd.h"

#if MSDOS_COMPILER
#include "pckeys.h"
#if MSDOS_COMPILER==MSOFTC
#include <graph.h>
#else
#if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
#include <conio.h>
#if MSDOS_COMPILER==DJGPPC
#include <pc.h>
extern int fd0;
#endif
#else
#if MSDOS_COMPILER==WIN32C
#include <windows.h>
#endif
#endif
#endif
#include <time.h>

#else

#if HAVE_SYS_IOCTL_H
#include <sys/ioctl.h>
#endif

#if HAVE_TERMIOS_H && HAVE_TERMIOS_FUNCS
#include <termios.h>
#else
#if HAVE_TERMIO_H
#include <termio.h>
#else
#if HAVE_SGSTAT_H
#include <sgstat.h>
#else
#include <sgtty.h>
#endif
#endif
#endif

#if HAVE_TERMCAP_H
#include <termcap.h>
#endif
#ifdef _OSK
#include <signal.h>
#endif
#if OS2
#include <sys/signal.h>
#include "pckeys.h"
#endif
#if HAVE_SYS_STREAM_H
#include <sys/stream.h>
#endif
#if HAVE_SYS_PTEM_H
#include <sys/ptem.h>
#endif

#endif /* MSDOS_COMPILER */

/*
 * Check for broken termios package that forces you to manually
 * set the line discipline.
 */
#ifdef __ultrix__
#define MUST_SET_LINE_DISCIPLINE 1
#else
#define MUST_SET_LINE_DISCIPLINE 0
#endif

#if OS2
#define     DEFAULT_TERM            "ansi"
static char *windowid;
#else
#define     DEFAULT_TERM            "unknown"
#endif

#if MSDOS_COMPILER==MSOFTC
static int videopages;
static long msec_loops;
static int flash_created = 0;
#define     SETCOLORS(fg,bg)  { _settextcolor(fg); _setbkcolor(bg); }
#endif

#if MSDOS_COMPILER==BORLANDC
static unsigned short *whitescreen;
static int flash_created = 0;
#endif
#if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
#define _settextposition(y,x)   gotoxy(x,y)
#define _clearscreen(m)         clrscr()
#define _outtext(s)             cputs(s)
#define     SETCOLORS(fg,bg)  { textcolor(fg); textbackground(bg); }
extern int sc_height;
#endif

#if MSDOS_COMPILER==WIN32C
struct keyRecord
{
      int ascii;
      int scan;
} currentKey;

static int keyCount = 0;
static WORD curr_attr;
static int pending_scancode = 0;
static WORD *whitescreen;

static HANDLE con_out_save = INVALID_HANDLE_VALUE; /* previous console */
static HANDLE con_out_ours = INVALID_HANDLE_VALUE; /* our own */
HANDLE con_out = INVALID_HANDLE_VALUE;             /* current console */

extern int quitting;
static void win32_init_term();
static void win32_deinit_term();

#define FG_COLORS       (FOREGROUND_RED | FOREGROUND_GREEN | FOREGROUND_BLUE | FOREGROUND_INTENSITY)
#define BG_COLORS       (BACKGROUND_RED | BACKGROUND_GREEN | BACKGROUND_BLUE | BACKGROUND_INTENSITY)
#define     MAKEATTR(fg,bg)         ((WORD)((fg)|((bg)<<4)))
#define     SETCOLORS(fg,bg)  { curr_attr = MAKEATTR(fg,bg); \
                        if (SetConsoleTextAttribute(con_out, curr_attr) == 0) \
                        error("SETCOLORS failed"); }
#endif

#if MSDOS_COMPILER
public int nm_fg_color;       /* Color of normal text */
public int nm_bg_color;
public int bo_fg_color;       /* Color of bold text */
public int bo_bg_color;
public int ul_fg_color;       /* Color of underlined text */
public int ul_bg_color;
public int so_fg_color;       /* Color of standout text */
public int so_bg_color;
public int bl_fg_color;       /* Color of blinking text */
public int bl_bg_color;
static int sy_fg_color;       /* Color of system text (before less) */
static int sy_bg_color;

#else

/*
 * Strings passed to tputs() to do various terminal functions.
 */
static char
      *sc_pad,          /* Pad string */
      *sc_home,         /* Cursor home */
      *sc_addline,            /* Add line, scroll down following lines */
      *sc_lower_left,         /* Cursor to last line, first column */
      *sc_move,         /* General cursor positioning */
      *sc_clear,        /* Clear screen */
      *sc_eol_clear,          /* Clear to end of line */
      *sc_eos_clear,          /* Clear to end of screen */
      *sc_s_in,         /* Enter standout (highlighted) mode */
      *sc_s_out,        /* Exit standout mode */
      *sc_u_in,         /* Enter underline mode */
      *sc_u_out,        /* Exit underline mode */
      *sc_b_in,         /* Enter bold mode */
      *sc_b_out,        /* Exit bold mode */
      *sc_bl_in,        /* Enter blink mode */
      *sc_bl_out,       /* Exit blink mode */
      *sc_visual_bell,  /* Visual bell (flash screen) sequence */
      *sc_backspace,          /* Backspace cursor */
      *sc_s_keypad,           /* Start keypad mode */
      *sc_e_keypad,           /* End keypad mode */
      *sc_init,         /* Startup terminal initialization */
      *sc_deinit;       /* Exit terminal de-initialization */
#endif

static int init_done = 0;

public int auto_wrap;         /* Terminal does \r\n when write past margin */
public int ignaw;       /* Terminal ignores \n immediately after wrap */
public int erase_char;        /* The user's erase char */
public int erase2_char;       /* The user's other erase char */
public int kill_char;         /* The user's line-kill char */
public int werase_char;       /* The user's word-erase char */
public int sc_width, sc_height;     /* Height & width of screen */
public int bo_s_width, bo_e_width;  /* Printing width of boldface seq */
public int ul_s_width, ul_e_width;  /* Printing width of underline seq */
public int so_s_width, so_e_width;  /* Printing width of standout seq */
public int bl_s_width, bl_e_width;  /* Printing width of blink seq */
public int above_mem, below_mem;    /* Memory retained above/below screen */
public int can_goto_line;           /* Can move cursor to any line */
public int clear_bg;          /* Clear fills with background color */
public int missing_cap = 0;   /* Some capability is missing */

static int attrmode = AT_NORMAL;
extern int binattr;

#if !MSDOS_COMPILER
static char *cheaper();
static void tmodes();
#endif

/*
 * These two variables are sometimes defined in,
 * and needed by, the termcap library.
 */
#if MUST_DEFINE_OSPEED
extern short ospeed;    /* Terminal output baud rate */
extern char PC;         /* Pad character */
#endif
#ifdef _OSK
short ospeed;
char PC_, *UP, *BC;
#endif

extern int quiet;       /* If VERY_QUIET, use visual bell for bell */
extern int no_back_scroll;
extern int swindow;
extern int no_init;
extern int no_keypad;
extern int sigs;
extern int wscroll;
extern int screen_trashed;
extern int tty;
extern int top_scroll;
#if HILITE_SEARCH
extern int hilite_search;
#endif

extern char *tgetstr();
extern char *tgoto();


/*
 * Change terminal to "raw mode", or restore to "normal" mode.
 * "Raw mode" means 
 *    1. An outstanding read will complete on receipt of a single keystroke.
 *    2. Input is not echoed.  
 *    3. On output, \n is mapped to \r\n.
 *    4. \t is NOT expanded into spaces.
 *    5. Signal-causing characters such as ctrl-C (interrupt),
 *       etc. are NOT disabled.
 * It doesn't matter whether an input \n is mapped to \r, or vice versa.
 */
      public void
raw_mode(on)
      int on;
{
      static int curr_on = 0;

      if (on == curr_on)
            return;
      erase2_char = '\b'; /* in case OS doesn't know about erase2 */
#if HAVE_TERMIOS_H && HAVE_TERMIOS_FUNCS
    {
      struct termios s;
      static struct termios save_term;
      static int saved_term = 0;

      if (on) 
      {
            /*
             * Get terminal modes.
             */
            tcgetattr(tty, &s);

            /*
             * Save modes and set certain variables dependent on modes.
             */
            if (!saved_term)
            {
                  save_term = s;
                  saved_term = 1;
            }
#if HAVE_OSPEED
            switch (cfgetospeed(&s))
            {
#ifdef B0
            case B0: ospeed = 0; break;
#endif
#ifdef B50
            case B50: ospeed = 1; break;
#endif
#ifdef B75
            case B75: ospeed = 2; break;
#endif
#ifdef B110
            case B110: ospeed = 3; break;
#endif
#ifdef B134
            case B134: ospeed = 4; break;
#endif
#ifdef B150
            case B150: ospeed = 5; break;
#endif
#ifdef B200
            case B200: ospeed = 6; break;
#endif
#ifdef B300
            case B300: ospeed = 7; break;
#endif
#ifdef B600
            case B600: ospeed = 8; break;
#endif
#ifdef B1200
            case B1200: ospeed = 9; break;
#endif
#ifdef B1800
            case B1800: ospeed = 10; break;
#endif
#ifdef B2400
            case B2400: ospeed = 11; break;
#endif
#ifdef B4800
            case B4800: ospeed = 12; break;
#endif
#ifdef B9600
            case B9600: ospeed = 13; break;
#endif
#ifdef EXTA
            case EXTA: ospeed = 14; break;
#endif
#ifdef EXTB
            case EXTB: ospeed = 15; break;
#endif
#ifdef B57600
            case B57600: ospeed = 16; break;
#endif
#ifdef B115200
            case B115200: ospeed = 17; break;
#endif
            default: ;
            }
#endif
            erase_char = s.c_cc[VERASE];
#ifdef VERASE2
            erase2_char = s.c_cc[VERASE2];
#endif
            kill_char = s.c_cc[VKILL];
#ifdef VWERASE
            werase_char = s.c_cc[VWERASE];
#else
            werase_char = CONTROL('W');
#endif

            /*
             * Set the modes to the way we want them.
             */
            s.c_lflag &= ~(0
#ifdef ICANON
                  | ICANON
#endif
#ifdef ECHO
                  | ECHO
#endif
#ifdef ECHOE
                  | ECHOE
#endif
#ifdef ECHOK
                  | ECHOK
#endif
#if ECHONL
                  | ECHONL
#endif
            );

            s.c_oflag |= (0
#ifdef OXTABS
                  | OXTABS
#else
#ifdef TAB3
                  | TAB3
#else
#ifdef XTABS
                  | XTABS
#endif
#endif
#endif
#ifdef OPOST
                  | OPOST
#endif
#ifdef ONLCR
                  | ONLCR
#endif
            );

            s.c_oflag &= ~(0
#ifdef ONOEOT
                  | ONOEOT
#endif
#ifdef OCRNL
                  | OCRNL
#endif
#ifdef ONOCR
                  | ONOCR
#endif
#ifdef ONLRET
                  | ONLRET
#endif
            );
            s.c_cc[VMIN] = 1;
            s.c_cc[VTIME] = 0;
#ifdef VLNEXT
            s.c_cc[VLNEXT] = 0;
#endif
#ifdef VDSUSP
            s.c_cc[VDSUSP] = 0;
#endif
#if MUST_SET_LINE_DISCIPLINE
            /*
             * System's termios is broken; need to explicitly 
             * request TERMIODISC line discipline.
             */
            s.c_line = TERMIODISC;
#endif
      } else
      {
            /*
             * Restore saved modes.
             */
            s = save_term;
      }
#if HAVE_FSYNC
      fsync(tty);
#endif
      tcsetattr(tty, TCSADRAIN, &s);
#if MUST_SET_LINE_DISCIPLINE
      if (!on)
      {
            /*
             * Broken termios *ignores* any line discipline
             * except TERMIODISC.  A different old line discipline
             * is therefore not restored, yet.  Restore the old
             * line discipline by hand.
             */
            ioctl(tty, TIOCSETD, &save_term.c_line);
      }
#endif
    }
#else
#ifdef TCGETA
    {
      struct termio s;
      static struct termio save_term;
      static int saved_term = 0;

      if (on)
      {
            /*
             * Get terminal modes.
             */
            ioctl(tty, TCGETA, &s);

            /*
             * Save modes and set certain variables dependent on modes.
             */
            if (!saved_term)
            {
                  save_term = s;
                  saved_term = 1;
            }
#if HAVE_OSPEED
            ospeed = s.c_cflag & CBAUD;
#endif
            erase_char = s.c_cc[VERASE];
            kill_char = s.c_cc[VKILL];
#ifdef VWERASE
            werase_char = s.c_cc[VWERASE];
#else
            werase_char = CONTROL('W');
#endif

            /*
             * Set the modes to the way we want them.
             */
            s.c_lflag &= ~(ICANON|ECHO|ECHOE|ECHOK|ECHONL);
            s.c_oflag |=  (OPOST|ONLCR|TAB3);
            s.c_oflag &= ~(OCRNL|ONOCR|ONLRET);
            s.c_cc[VMIN] = 1;
            s.c_cc[VTIME] = 0;
      } else
      {
            /*
             * Restore saved modes.
             */
            s = save_term;
      }
      ioctl(tty, TCSETAW, &s);
    }
#else
#ifdef TIOCGETP
    {
      struct sgttyb s;
      static struct sgttyb save_term;
      static int saved_term = 0;

      if (on)
      {
            /*
             * Get terminal modes.
             */
            ioctl(tty, TIOCGETP, &s);

            /*
             * Save modes and set certain variables dependent on modes.
             */
            if (!saved_term)
            {
                  save_term = s;
                  saved_term = 1;
            }
#if HAVE_OSPEED
            ospeed = s.sg_ospeed;
#endif
            erase_char = s.sg_erase;
            kill_char = s.sg_kill;
            werase_char = CONTROL('W');

            /*
             * Set the modes to the way we want them.
             */
            s.sg_flags |= CBREAK;
            s.sg_flags &= ~(ECHO|XTABS);
      } else
      {
            /*
             * Restore saved modes.
             */
            s = save_term;
      }
      ioctl(tty, TIOCSETN, &s);
    }
#else
#ifdef _OSK
    {
      struct sgbuf s;
      static struct sgbuf save_term;
      static int saved_term = 0;

      if (on)
      {
            /*
             * Get terminal modes.
             */
            _gs_opt(tty, &s);

            /*
             * Save modes and set certain variables dependent on modes.
             */
            if (!saved_term)
            {
                  save_term = s;
                  saved_term = 1;
            }
            erase_char = s.sg_bspch;
            kill_char = s.sg_dlnch;
            werase_char = CONTROL('W');

            /*
             * Set the modes to the way we want them.
             */
            s.sg_echo = 0;
            s.sg_eofch = 0;
            s.sg_pause = 0;
            s.sg_psch = 0;
      } else
      {
            /*
             * Restore saved modes.
             */
            s = save_term;
      }
      _ss_opt(tty, &s);
    }
#else
      /* MS-DOS, Windows, or OS2 */
#if OS2
      /* OS2 */
      LSIGNAL(SIGINT, SIG_IGN);
#endif
      erase_char = '\b';
#if MSDOS_COMPILER==DJGPPC
      kill_char = CONTROL('U');
      /*
       * So that when we shell out or run another program, its
       * stdin is in cooked mode.  We do not switch stdin to binary 
       * mode if fd0 is zero, since that means we were called before
       * tty was reopened in open_getchr, in which case we would be
       * changing the original stdin device outside less.
       */
      if (fd0 != 0)
            setmode(0, on ? O_BINARY : O_TEXT);
#else
      kill_char = ESC;
#endif
      werase_char = CONTROL('W');
#endif
#endif
#endif
#endif
      curr_on = on;
}

#if !MSDOS_COMPILER
/*
 * Some glue to prevent calling termcap functions if tgetent() failed.
 */
static int hardcopy;

      static char *
ltget_env(capname)
      char *capname;
{
      char name[16];

      strcpy(name, "LESS_TERMCAP_");
      strcat(name, capname);
      return (lgetenv(name));
}

      static int
ltgetflag(capname)
      char *capname;
{
      char *s;

      if ((s = ltget_env(capname)) != NULL)
            return (*s != '\0' && *s != '0');
      if (hardcopy)
            return (0);
      return (tgetflag(capname));
}

      static int
ltgetnum(capname)
      char *capname;
{
      char *s;

      if ((s = ltget_env(capname)) != NULL)
            return (atoi(s));
      if (hardcopy)
            return (-1);
      return (tgetnum(capname));
}

      static char *
ltgetstr(capname, pp)
      char *capname;
      char **pp;
{
      char *s;

      if ((s = ltget_env(capname)) != NULL)
            return (s);
      if (hardcopy)
            return (NULL);
      return (tgetstr(capname, pp));
}
#endif /* MSDOS_COMPILER */

/*
 * Get size of the output screen.
 */
      public void
scrsize()
{
      register char *s;
      int sys_height;
      int sys_width;
#if !MSDOS_COMPILER
      int n;
#endif

#define     DEF_SC_WIDTH      80
#if MSDOS_COMPILER
#define     DEF_SC_HEIGHT     25
#else
#define     DEF_SC_HEIGHT     24
#endif


      sys_width = sys_height = 0;

#if MSDOS_COMPILER==MSOFTC
      {
            struct videoconfig w;
            _getvideoconfig(&w);
            sys_height = w.numtextrows;
            sys_width = w.numtextcols;
      }
#else
#if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
      {
            struct text_info w;
            gettextinfo(&w);
            sys_height = w.screenheight;
            sys_width = w.screenwidth;
      }
#else
#if MSDOS_COMPILER==WIN32C
      {
            CONSOLE_SCREEN_BUFFER_INFO scr;
            GetConsoleScreenBufferInfo(con_out, &scr);
            sys_height = scr.srWindow.Bottom - scr.srWindow.Top + 1;
            sys_width = scr.srWindow.Right - scr.srWindow.Left + 1;
      }
#else
#if OS2
      {
            int s[2];
            _scrsize(s);
            sys_width = s[0];
            sys_height = s[1];
            /*
             * When using terminal emulators for XFree86/OS2, the
             * _scrsize function does not work well.
             * Call the scrsize.exe program to get the window size.
             */
            windowid = getenv("WINDOWID");
            if (windowid != NULL)
            {
                  FILE *fd = popen("scrsize", "rt");
                  if (fd != NULL)
                  {
                        int w, h;
                        fscanf(fd, "%i %i", &w, &h);
                        if (w > 0 && h > 0)
                        {
                              sys_width = w;
                              sys_height = h;
                        }
                        pclose(fd);
                  }
            }
      }
#else
#ifdef TIOCGWINSZ
      {
            struct winsize w;
            if (ioctl(2, TIOCGWINSZ, &w) == 0)
            {
                  if (w.ws_row > 0)
                        sys_height = w.ws_row;
                  if (w.ws_col > 0)
                        sys_width = w.ws_col;
            }
      }
#else
#ifdef WIOCGETD
      {
            struct uwdata w;
            if (ioctl(2, WIOCGETD, &w) == 0)
            {
                  if (w.uw_height > 0)
                        sys_height = w.uw_height / w.uw_vs;
                  if (w.uw_width > 0)
                        sys_width = w.uw_width / w.uw_hs;
            }
      }
#endif
#endif
#endif
#endif
#endif
#endif

      if (sys_height > 0)
            sc_height = sys_height;
      else if ((s = lgetenv("LINES")) != NULL)
            sc_height = atoi(s);
#if !MSDOS_COMPILER
      else if ((n = ltgetnum("li")) > 0)
            sc_height = n;
#endif
      else
            sc_height = DEF_SC_HEIGHT;

      if (sys_width > 0)
            sc_width = sys_width;
      else if ((s = lgetenv("COLUMNS")) != NULL)
            sc_width = atoi(s);
#if !MSDOS_COMPILER
      else if ((n = ltgetnum("co")) > 0)
            sc_width = n;
#endif
      else
            sc_width = DEF_SC_WIDTH;
}

#if MSDOS_COMPILER==MSOFTC
/*
 * Figure out how many empty loops it takes to delay a millisecond.
 */
      static void
get_clock()
{
      clock_t start;
      
      /*
       * Get synchronized at the start of a tick.
       */
      start = clock();
      while (clock() == start)
            ;
      /*
       * Now count loops till the next tick.
       */
      start = clock();
      msec_loops = 0;
      while (clock() == start)
            msec_loops++;
      /*
       * Convert from (loops per clock) to (loops per millisecond).
       */
      msec_loops *= CLOCKS_PER_SEC;
      msec_loops /= 1000;
}

/*
 * Delay for a specified number of milliseconds.
 */
      static void
dummy_func()
{
      static long delay_dummy = 0;
      delay_dummy++;
}

      static void
delay(msec)
      int msec;
{
      long i;
      
      while (msec-- > 0)
      {
            for (i = 0;  i < msec_loops;  i++)
            {
                  /*
                   * Make it look like we're doing something here,
                   * so the optimizer doesn't remove the whole loop.
                   */
                  dummy_func();
            }
      }
}
#endif

/*
 * Return the characters actually input by a "special" key.
 */
      public char *
special_key_str(key)
      int key;
{
      static char tbuf[40];
      char *s;
#if MSDOS_COMPILER || OS2
      static char k_right[]         = { '\340', PCK_RIGHT, 0 };
      static char k_left[]          = { '\340', PCK_LEFT, 0  };
      static char k_ctl_right[]     = { '\340', PCK_CTL_RIGHT, 0  };
      static char k_ctl_left[]      = { '\340', PCK_CTL_LEFT, 0  };
      static char k_insert[]        = { '\340', PCK_INSERT, 0  };
      static char k_delete[]        = { '\340', PCK_DELETE, 0  };
      static char k_ctl_delete[]    = { '\340', PCK_CTL_DELETE, 0  };
      static char k_ctl_backspace[] = { '\177', 0 };
      static char k_home[]          = { '\340', PCK_HOME, 0 };
      static char k_end[]           = { '\340', PCK_END, 0 };
      static char k_up[]            = { '\340', PCK_UP, 0 };
      static char k_down[]          = { '\340', PCK_DOWN, 0 };
      static char k_backtab[]       = { '\340', PCK_SHIFT_TAB, 0 };
      static char k_pagedown[]      = { '\340', PCK_PAGEDOWN, 0 };
      static char k_pageup[]        = { '\340', PCK_PAGEUP, 0 };
      static char k_f1[]            = { '\340', PCK_F1, 0 };
#endif
#if !MSDOS_COMPILER
      char *sp = tbuf;
#endif

      switch (key)
      {
#if OS2
      /*
       * If windowid is not NULL, assume less is executed in 
       * the XFree86 environment.
       */
      case SK_RIGHT_ARROW:
            s = windowid ? ltgetstr("kr", &sp) : k_right;
            break;
      case SK_LEFT_ARROW:
            s = windowid ? ltgetstr("kl", &sp) : k_left;
            break;
      case SK_UP_ARROW:
            s = windowid ? ltgetstr("ku", &sp) : k_up;
            break;
      case SK_DOWN_ARROW:
            s = windowid ? ltgetstr("kd", &sp) : k_down;
            break;
      case SK_PAGE_UP:
            s = windowid ? ltgetstr("kP", &sp) : k_pageup;
            break;
      case SK_PAGE_DOWN:
            s = windowid ? ltgetstr("kN", &sp) : k_pagedown;
            break;
      case SK_HOME:
            s = windowid ? ltgetstr("kh", &sp) : k_home;
            break;
      case SK_END:
            s = windowid ? ltgetstr("@7", &sp) : k_end;
            break;
      case SK_DELETE:
            if (windowid)
            {
                  s = ltgetstr("kD", &sp);
                  if (s == NULL)
                  {
                        tbuf[0] = '\177';
                        tbuf[1] = '\0';
                        s = tbuf;
                  }
            } else
                  s = k_delete;
            break;
#endif
#if MSDOS_COMPILER
      case SK_RIGHT_ARROW:
            s = k_right;
            break;
      case SK_LEFT_ARROW:
            s = k_left;
            break;
      case SK_UP_ARROW:
            s = k_up;
            break;
      case SK_DOWN_ARROW:
            s = k_down;
            break;
      case SK_PAGE_UP:
            s = k_pageup;
            break;
      case SK_PAGE_DOWN:
            s = k_pagedown;
            break;
      case SK_HOME:
            s = k_home;
            break;
      case SK_END:
            s = k_end;
            break;
      case SK_DELETE:
            s = k_delete;
            break;
#endif
#if MSDOS_COMPILER || OS2
      case SK_INSERT:
            s = k_insert;
            break;
      case SK_CTL_LEFT_ARROW:
            s = k_ctl_left;
            break;
      case SK_CTL_RIGHT_ARROW:
            s = k_ctl_right;
            break;
      case SK_CTL_BACKSPACE:
            s = k_ctl_backspace;
            break;
      case SK_CTL_DELETE:
            s = k_ctl_delete;
            break;
      case SK_F1:
            s = k_f1;
            break;
      case SK_BACKTAB:
            s = k_backtab;
            break;
#else
      case SK_RIGHT_ARROW:
            s = ltgetstr("kr", &sp);
            break;
      case SK_LEFT_ARROW:
            s = ltgetstr("kl", &sp);
            break;
      case SK_UP_ARROW:
            s = ltgetstr("ku", &sp);
            break;
      case SK_DOWN_ARROW:
            s = ltgetstr("kd", &sp);
            break;
      case SK_PAGE_UP:
            s = ltgetstr("kP", &sp);
            break;
      case SK_PAGE_DOWN:
            s = ltgetstr("kN", &sp);
            break;
      case SK_HOME:
            s = ltgetstr("kh", &sp);
            break;
      case SK_END:
            s = ltgetstr("@7", &sp);
            break;
      case SK_DELETE:
            s = ltgetstr("kD", &sp);
            if (s == NULL)
            {
                  tbuf[0] = '\177';
                  tbuf[1] = '\0';
                  s = tbuf;
            }
            break;
#endif
      case SK_CONTROL_K:
            tbuf[0] = CONTROL('K');
            tbuf[1] = '\0';
            s = tbuf;
            break;
      default:
            return (NULL);
      }
      return (s);
}

/*
 * Get terminal capabilities via termcap.
 */
      public void
get_term()
{
#if MSDOS_COMPILER
      auto_wrap = 1;
      ignaw = 0;
      can_goto_line = 1;
      clear_bg = 1;
      /*
       * Set up default colors.
       * The xx_s_width and xx_e_width vars are already initialized to 0.
       */
#if MSDOS_COMPILER==MSOFTC
      sy_bg_color = _getbkcolor();
      sy_fg_color = _gettextcolor();
      get_clock();
#else
#if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
    {
      struct text_info w;
      gettextinfo(&w);
      sy_bg_color = (w.attribute >> 4) & 0x0F;
      sy_fg_color = (w.attribute >> 0) & 0x0F;
    }
#else
#if MSDOS_COMPILER==WIN32C
    {
      DWORD nread;
      CONSOLE_SCREEN_BUFFER_INFO scr;

      con_out_save = con_out = GetStdHandle(STD_OUTPUT_HANDLE);
      /*
       * Always open stdin in binary. Note this *must* be done
       * before any file operations have been done on fd0.
       */
      SET_BINARY(0);
      GetConsoleScreenBufferInfo(con_out, &scr);
      ReadConsoleOutputAttribute(con_out, &curr_attr, 
                              1, scr.dwCursorPosition, &nread);
      sy_bg_color = (curr_attr & BG_COLORS) >> 4; /* normalize */
      sy_fg_color = curr_attr & FG_COLORS;
    }
#endif
#endif
#endif
      nm_fg_color = sy_fg_color;
      nm_bg_color = sy_bg_color;
      bo_fg_color = 11;
      bo_bg_color = 0;
      ul_fg_color = 9;
      ul_bg_color = 0;
      so_fg_color = 15;
      so_bg_color = 9;
      bl_fg_color = 15;
      bl_bg_color = 0;

      /*
       * Get size of the screen.
       */
      scrsize();
      pos_init();


#else /* !MSDOS_COMPILER */

      char *sp;
      register char *t1, *t2;
      char *term;
      char termbuf[TERMBUF_SIZE];

      static char sbuf[TERMSBUF_SIZE];

#if OS2
      /*
       * Make sure the termcap database is available.
       */
      sp = lgetenv("TERMCAP");
      if (sp == NULL || *sp == '\0')
      {
            char *termcap;
            if ((sp = homefile("termcap.dat")) != NULL)
            {
                  termcap = (char *) ecalloc(strlen(sp)+9, sizeof(char));
                  sprintf(termcap, "TERMCAP=%s", sp);
                  free(sp);
                  putenv(termcap);
            }
      }
#endif
      /*
       * Find out what kind of terminal this is.
       */
      if ((term = lgetenv("TERM")) == NULL)
            term = DEFAULT_TERM;
      hardcopy = 0;
      if (tgetent(termbuf, term) <= 0)
            hardcopy = 1;
      if (ltgetflag("hc"))
            hardcopy = 1;

      /*
       * Get size of the screen.
       */
      scrsize();
      pos_init();

      auto_wrap = ltgetflag("am");
      ignaw = ltgetflag("xn");
      above_mem = ltgetflag("da");
      below_mem = ltgetflag("db");
      clear_bg = ltgetflag("ut");

      /*
       * Assumes termcap variable "sg" is the printing width of:
       * the standout sequence, the end standout sequence,
       * the underline sequence, the end underline sequence,
       * the boldface sequence, and the end boldface sequence.
       */
      if ((so_s_width = ltgetnum("sg")) < 0)
            so_s_width = 0;
      so_e_width = so_s_width;

      bo_s_width = bo_e_width = so_s_width;
      ul_s_width = ul_e_width = so_s_width;
      bl_s_width = bl_e_width = so_s_width;

#if HILITE_SEARCH
      if (so_s_width > 0 || so_e_width > 0)
            /*
             * Disable highlighting by default on magic cookie terminals.
             * Turning on highlighting might change the displayed width
             * of a line, causing the display to get messed up.
             * The user can turn it back on with -g, 
             * but she won't like the results.
             */
            hilite_search = 0;
#endif

      /*
       * Get various string-valued capabilities.
       */
      sp = sbuf;

#if HAVE_OSPEED
      sc_pad = ltgetstr("pc", &sp);
      if (sc_pad != NULL)
            PC = *sc_pad;
#endif

      sc_s_keypad = ltgetstr("ks", &sp);
      if (sc_s_keypad == NULL)
            sc_s_keypad = "";
      sc_e_keypad = ltgetstr("ke", &sp);
      if (sc_e_keypad == NULL)
            sc_e_keypad = "";
            
      sc_init = ltgetstr("ti", &sp);
      if (sc_init == NULL)
            sc_init = "";

      sc_deinit= ltgetstr("te", &sp);
      if (sc_deinit == NULL)
            sc_deinit = "";

      sc_eol_clear = ltgetstr("ce", &sp);
      if (sc_eol_clear == NULL || *sc_eol_clear == '\0')
      {
            missing_cap = 1;
            sc_eol_clear = "";
      }

      sc_eos_clear = ltgetstr("cd", &sp);
      if (below_mem && (sc_eos_clear == NULL || *sc_eos_clear == '\0'))
      {
            missing_cap = 1;
            sc_eos_clear = "";
      }

      sc_clear = ltgetstr("cl", &sp);
      if (sc_clear == NULL || *sc_clear == '\0')
      {
            missing_cap = 1;
            sc_clear = "\n\n";
      }

      sc_move = ltgetstr("cm", &sp);
      if (sc_move == NULL || *sc_move == '\0')
      {
            /*
             * This is not an error here, because we don't 
             * always need sc_move.
             * We need it only if we don't have home or lower-left.
             */
            sc_move = "";
            can_goto_line = 0;
      } else
            can_goto_line = 1;

      tmodes("so", "se", &sc_s_in, &sc_s_out, "", "", &sp);
      tmodes("us", "ue", &sc_u_in, &sc_u_out, sc_s_in, sc_s_out, &sp);
      tmodes("md", "me", &sc_b_in, &sc_b_out, sc_s_in, sc_s_out, &sp);
      tmodes("mb", "me", &sc_bl_in, &sc_bl_out, sc_s_in, sc_s_out, &sp);

      sc_visual_bell = ltgetstr("vb", &sp);
      if (sc_visual_bell == NULL)
            sc_visual_bell = "";

      if (ltgetflag("bs"))
            sc_backspace = "\b";
      else
      {
            sc_backspace = ltgetstr("bc", &sp);
            if (sc_backspace == NULL || *sc_backspace == '\0')
                  sc_backspace = "\b";
      }

      /*
       * Choose between using "ho" and "cm" ("home" and "cursor move")
       * to move the cursor to the upper left corner of the screen.
       */
      t1 = ltgetstr("ho", &sp);
      if (t1 == NULL)
            t1 = "";
      if (*sc_move == '\0')
            t2 = "";
      else
      {
            strcpy(sp, tgoto(sc_move, 0, 0));
            t2 = sp;
            sp += strlen(sp) + 1;
      }
      sc_home = cheaper(t1, t2, "|\b^");

      /*
       * Choose between using "ll" and "cm"  ("lower left" and "cursor move")
       * to move the cursor to the lower left corner of the screen.
       */
      t1 = ltgetstr("ll", &sp);
      if (t1 == NULL)
            t1 = "";
      if (*sc_move == '\0')
            t2 = "";
      else
      {
            strcpy(sp, tgoto(sc_move, 0, sc_height-1));
            t2 = sp;
            sp += strlen(sp) + 1;
      }
      sc_lower_left = cheaper(t1, t2, "\r");

      /*
       * Choose between using "al" or "sr" ("add line" or "scroll reverse")
       * to add a line at the top of the screen.
       */
      t1 = ltgetstr("al", &sp);
      if (t1 == NULL)
            t1 = "";
      t2 = ltgetstr("sr", &sp);
      if (t2 == NULL)
            t2 = "";
#if OS2
      if (*t1 == '\0' && *t2 == '\0')
            sc_addline = "";
      else
#endif
      if (above_mem)
            sc_addline = t1;
      else
            sc_addline = cheaper(t1, t2, "");
      if (*sc_addline == '\0')
      {
            /*
             * Force repaint on any backward movement.
             */
            no_back_scroll = 1;
      }
#endif /* MSDOS_COMPILER */
}

#if !MSDOS_COMPILER
/*
 * Return the cost of displaying a termcap string.
 * We use the trick of calling tputs, but as a char printing function
 * we give it inc_costcount, which just increments "costcount".
 * This tells us how many chars would be printed by using this string.
 * {{ Couldn't we just use strlen? }}
 */
static int costcount;

/*ARGSUSED*/
      static int
inc_costcount(c)
      int c;
{
      costcount++;
      return (c);
}

      static int
cost(t)
      char *t;
{
      costcount = 0;
      tputs(t, sc_height, inc_costcount);
      return (costcount);
}

/*
 * Return the "best" of the two given termcap strings.
 * The best, if both exist, is the one with the lower 
 * cost (see cost() function).
 */
      static char *
cheaper(t1, t2, def)
      char *t1, *t2;
      char *def;
{
      if (*t1 == '\0' && *t2 == '\0')
      {
            missing_cap = 1;
            return (def);
      }
      if (*t1 == '\0')
            return (t2);
      if (*t2 == '\0')
            return (t1);
      if (cost(t1) < cost(t2))
            return (t1);
      return (t2);
}

      static void
tmodes(incap, outcap, instr, outstr, def_instr, def_outstr, spp)
      char *incap;
      char *outcap;
      char **instr;
      char **outstr;
      char *def_instr;
      char *def_outstr;
      char **spp;
{
      *instr = ltgetstr(incap, spp);
      if (*instr == NULL)
      {
            /* Use defaults. */
            *instr = def_instr;
            *outstr = def_outstr;
            return;
      }

      *outstr = ltgetstr(outcap, spp);
      if (*outstr == NULL)
            /* No specific out capability; use "me". */
            *outstr = ltgetstr("me", spp);
      if (*outstr == NULL)
            /* Don't even have "me"; use a null string. */
            *outstr = "";
}

#endif /* MSDOS_COMPILER */


/*
 * Below are the functions which perform all the 
 * terminal-specific screen manipulation.
 */


#if MSDOS_COMPILER

#if MSDOS_COMPILER==WIN32C
      static void
_settextposition(int row, int col)
{
      COORD cpos;
      CONSOLE_SCREEN_BUFFER_INFO csbi;

      GetConsoleScreenBufferInfo(con_out, &csbi);
      cpos.X = csbi.srWindow.Left + (col - 1);
      cpos.Y = csbi.srWindow.Top + (row - 1);
      SetConsoleCursorPosition(con_out, cpos);
}
#endif

/*
 * Initialize the screen to the correct color at startup.
 */
      static void
initcolor()
{
      SETCOLORS(nm_fg_color, nm_bg_color);
#if 0
      /*
       * This clears the screen at startup.  This is different from
       * the behavior of other versions of less.  Disable it for now.
       */
      char *blanks;
      int row;
      int col;
      
      /*
       * Create a complete, blank screen using "normal" colors.
       */
      SETCOLORS(nm_fg_color, nm_bg_color);
      blanks = (char *) ecalloc(width+1, sizeof(char));
      for (col = 0;  col < sc_width;  col++)
            blanks[col] = ' ';
      blanks[sc_width] = '\0';
      for (row = 0;  row < sc_height;  row++)
            _outtext(blanks);
      free(blanks);
#endif
}
#endif

#if MSDOS_COMPILER==WIN32C

/*
 * Termcap-like init with a private win32 console.
 */
      static void
win32_init_term()
{
      CONSOLE_SCREEN_BUFFER_INFO scr;
      COORD size;

      if (con_out_save == INVALID_HANDLE_VALUE)
            return;

      GetConsoleScreenBufferInfo(con_out_save, &scr);

      if (con_out_ours == INVALID_HANDLE_VALUE)
      {
            /*
             * Create our own screen buffer, so that we
             * may restore the original when done.
             */
            con_out_ours = CreateConsoleScreenBuffer(
                  GENERIC_WRITE | GENERIC_READ,
                  FILE_SHARE_WRITE | FILE_SHARE_READ,
                  (LPSECURITY_ATTRIBUTES) NULL,
                  CONSOLE_TEXTMODE_BUFFER,
                  (LPVOID) NULL);
      }

      size.X = scr.srWindow.Right - scr.srWindow.Left + 1;
      size.Y = scr.srWindow.Bottom - scr.srWindow.Top + 1;
      SetConsoleScreenBufferSize(con_out_ours, size);
      SetConsoleActiveScreenBuffer(con_out_ours);
      con_out = con_out_ours;
}

/*
 * Restore the startup console.
 */
static void
win32_deinit_term()
{
      if (con_out_save == INVALID_HANDLE_VALUE)
            return;
      if (quitting)
            (void) CloseHandle(con_out_ours);
      SetConsoleActiveScreenBuffer(con_out_save);
      con_out = con_out_save;
}

#endif

/*
 * Initialize terminal
 */
      public void
init()
{
#if !MSDOS_COMPILER
      if (!no_init)
            tputs(sc_init, sc_height, putchr);
      if (!no_keypad)
            tputs(sc_s_keypad, sc_height, putchr);
      if (top_scroll) 
      {
            int i;

            /*
             * This is nice to terminals with no alternate screen,
             * but with saved scrolled-off-the-top lines.  This way,
             * no previous line is lost, but we start with a whole
             * screen to ourself.
             */
            for (i = 1; i < sc_height; i++)
                  putchr('\n');
      }
#else
#if MSDOS_COMPILER==WIN32C
      if (!no_init)
            win32_init_term();
#endif
      initcolor();
      flush();
#endif
      init_done = 1;
}

/*
 * Deinitialize terminal
 */
      public void
deinit()
{
      if (!init_done)
            return;
#if !MSDOS_COMPILER
      if (!no_keypad)
            tputs(sc_e_keypad, sc_height, putchr);
      if (!no_init)
            tputs(sc_deinit, sc_height, putchr);
#else
      /* Restore system colors. */
      SETCOLORS(sy_fg_color, sy_bg_color);
#if MSDOS_COMPILER==WIN32C
      if (!no_init)
            win32_deinit_term();
#else
      /* Need clreol to make SETCOLORS take effect. */
      clreol();
#endif
#endif
      init_done = 0;
}

/*
 * Home cursor (move to upper left corner of screen).
 */
      public void
home()
{
#if !MSDOS_COMPILER
      tputs(sc_home, 1, putchr);
#else
      flush();
      _settextposition(1,1);
#endif
}

/*
 * Add a blank line (called with cursor at home).
 * Should scroll the display down.
 */
      public void
add_line()
{
#if !MSDOS_COMPILER
      tputs(sc_addline, sc_height, putchr);
#else
      flush();
#if MSDOS_COMPILER==MSOFTC
      _scrolltextwindow(_GSCROLLDOWN);
      _settextposition(1,1);
#else
#if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
      movetext(1,1, sc_width,sc_height-1, 1,2);
      gotoxy(1,1);
      clreol();
#else
#if MSDOS_COMPILER==WIN32C
    {
      CHAR_INFO fillchar;
      SMALL_RECT rcSrc, rcClip;
      COORD new_org;
      CONSOLE_SCREEN_BUFFER_INFO csbi;

      GetConsoleScreenBufferInfo(con_out,&csbi);

      /* The clip rectangle is the entire visible screen. */
      rcClip.Left = csbi.srWindow.Left;
      rcClip.Top = csbi.srWindow.Top;
      rcClip.Right = csbi.srWindow.Right;
      rcClip.Bottom = csbi.srWindow.Bottom;

      /* The source rectangle is the visible screen minus the last line. */
      rcSrc = rcClip;
      rcSrc.Bottom--;

      /* Move the top left corner of the source window down one row. */
      new_org.X = rcSrc.Left;
      new_org.Y = rcSrc.Top + 1;

      /* Fill the right character and attributes. */
      fillchar.Char.AsciiChar = ' ';
      curr_attr = MAKEATTR(nm_fg_color, nm_bg_color);
      fillchar.Attributes = curr_attr;
      ScrollConsoleScreenBuffer(con_out, &rcSrc, &rcClip, new_org, &fillchar);
      _settextposition(1,1);
    }
#endif
#endif
#endif
#endif
}

#if 0
/*
 * Remove the n topmost lines and scroll everything below it in the 
 * window upward.  This is needed to stop leaking the topmost line 
 * into the scrollback buffer when we go down-one-line (in WIN32).
 */
      public void
remove_top(n)
      int n;
{
#if MSDOS_COMPILER==WIN32C
      SMALL_RECT rcSrc, rcClip;
      CHAR_INFO fillchar;
      COORD new_org;
      CONSOLE_SCREEN_BUFFER_INFO csbi; /* to get buffer info */

      if (n >= sc_height - 1)
      {
            clear();
            home();
            return;
      }

      flush();

      GetConsoleScreenBufferInfo(con_out, &csbi);

      /* Get the extent of all-visible-rows-but-the-last. */
      rcSrc.Left    = csbi.srWindow.Left;
      rcSrc.Top     = csbi.srWindow.Top + n;
      rcSrc.Right   = csbi.srWindow.Right;
      rcSrc.Bottom  = csbi.srWindow.Bottom;

      /* Get the clip rectangle. */
      rcClip.Left   = rcSrc.Left;
      rcClip.Top    = csbi.srWindow.Top;
      rcClip.Right  = rcSrc.Right;
      rcClip.Bottom = rcSrc.Bottom ;

      /* Move the source window up n rows. */
      new_org.X = rcSrc.Left;
      new_org.Y = rcSrc.Top - n;

      /* Fill the right character and attributes. */
      fillchar.Char.AsciiChar = ' ';
      curr_attr = MAKEATTR(nm_fg_color, nm_bg_color);
      fillchar.Attributes = curr_attr;

      ScrollConsoleScreenBuffer(con_out, &rcSrc, &rcClip, new_org, &fillchar);

      /* Position cursor on first blank line. */
      goto_line(sc_height - n - 1);
#endif
}
#endif

#if MSDOS_COMPILER==WIN32C
/*
 * Clear the screen.
 */
      static void
win32_clear()
{
      /*
       * This will clear only the currently visible rows of the NT
       * console buffer, which means none of the precious scrollback
       * rows are touched making for faster scrolling.  Note that, if
       * the window has fewer columns than the console buffer (i.e.
       * there is a horizontal scrollbar as well), the entire width
       * of the visible rows will be cleared.
       */
      COORD topleft;
      DWORD nchars;
      DWORD winsz;
      CONSOLE_SCREEN_BUFFER_INFO csbi;

      /* get the number of cells in the current buffer */
      GetConsoleScreenBufferInfo(con_out, &csbi);
      winsz = csbi.dwSize.X * (csbi.srWindow.Bottom - csbi.srWindow.Top + 1);
      topleft.X = 0;
      topleft.Y = csbi.srWindow.Top;

      curr_attr = MAKEATTR(nm_fg_color, nm_bg_color);
      FillConsoleOutputCharacter(con_out, ' ', winsz, topleft, &nchars);
      FillConsoleOutputAttribute(con_out, curr_attr, winsz, topleft, &nchars);
}

/*
 * Remove the n topmost lines and scroll everything below it in the 
 * window upward.
 */
      public void
win32_scroll_up(n)
      int n;
{
      SMALL_RECT rcSrc, rcClip;
      CHAR_INFO fillchar;
      COORD topleft;
      COORD new_org;
      DWORD nchars;
      DWORD size;
      CONSOLE_SCREEN_BUFFER_INFO csbi;

      if (n <= 0)
            return;

      if (n >= sc_height - 1)
      {
            win32_clear();
            _settextposition(1,1);
            return;
      }

      /* Get the extent of what will remain visible after scrolling. */
      GetConsoleScreenBufferInfo(con_out, &csbi);
      rcSrc.Left    = csbi.srWindow.Left;
      rcSrc.Top     = csbi.srWindow.Top + n;
      rcSrc.Right   = csbi.srWindow.Right;
      rcSrc.Bottom  = csbi.srWindow.Bottom;

      /* Get the clip rectangle. */
      rcClip.Left   = rcSrc.Left;
      rcClip.Top    = csbi.srWindow.Top;
      rcClip.Right  = rcSrc.Right;
      rcClip.Bottom = rcSrc.Bottom ;

      /* Move the source text to the top of the screen. */
      new_org.X = rcSrc.Left;
      new_org.Y = 0;

      /* Fill the right character and attributes. */
      fillchar.Char.AsciiChar = ' ';
      fillchar.Attributes = MAKEATTR(nm_fg_color, nm_bg_color);

      /* Scroll the window. */
      SetConsoleTextAttribute(con_out, fillchar.Attributes);
      ScrollConsoleScreenBuffer(con_out, &rcSrc, &rcClip, new_org, &fillchar);

      /* Clear remaining lines at bottom. */
      topleft.X = csbi.dwCursorPosition.X;
      topleft.Y = rcSrc.Bottom - n;
      size = (n * csbi.dwSize.X) + (rcSrc.Right - topleft.X);
      FillConsoleOutputCharacter(con_out, ' ', size, topleft,
            &nchars);
      FillConsoleOutputAttribute(con_out, fillchar.Attributes, size, topleft,
            &nchars);
      SetConsoleTextAttribute(con_out, curr_attr);

      /* Move cursor n lines up from where it was. */
      csbi.dwCursorPosition.Y -= n;
      SetConsoleCursorPosition(con_out, csbi.dwCursorPosition);
}
#endif

/*
 * Move cursor to lower left corner of screen.
 */
      public void
lower_left()
{
#if !MSDOS_COMPILER
      tputs(sc_lower_left, 1, putchr);
#else
      flush();
      _settextposition(sc_height, 1);
#endif
}

/*
 * Check if the console size has changed and reset internals 
 * (in lieu of SIGWINCH for WIN32).
 */
      public void
check_winch()
{
#if MSDOS_COMPILER==WIN32C
      CONSOLE_SCREEN_BUFFER_INFO scr;
      COORD size;

      if (con_out == INVALID_HANDLE_VALUE)
            return;
 
      flush();
      GetConsoleScreenBufferInfo(con_out, &scr);
      size.Y = scr.srWindow.Bottom - scr.srWindow.Top + 1;
      size.X = scr.srWindow.Right - scr.srWindow.Left + 1;
      if (size.Y != sc_height || size.X != sc_width)
      {
            sc_height = size.Y;
            sc_width = size.X;
            if (!no_init && con_out_ours == con_out)
                  SetConsoleScreenBufferSize(con_out, size);
            pos_init();
            wscroll = (sc_height + 1) / 2;
            screen_trashed = 1;
      }
#endif
}

/*
 * Goto a specific line on the screen.
 */
      public void
goto_line(slinenum)
      int slinenum;
{
#if !MSDOS_COMPILER
      tputs(tgoto(sc_move, 0, slinenum), 1, putchr);
#else
      flush();
      _settextposition(slinenum+1, 1);
#endif
}

#if MSDOS_COMPILER==MSOFTC || MSDOS_COMPILER==BORLANDC
/*
 * Create an alternate screen which is all white.
 * This screen is used to create a "flash" effect, by displaying it
 * briefly and then switching back to the normal screen.
 * {{ Yuck!  There must be a better way to get a visual bell. }}
 */
      static void
create_flash()
{
#if MSDOS_COMPILER==MSOFTC
      struct videoconfig w;
      char *blanks;
      int row, col;
      
      _getvideoconfig(&w);
      videopages = w.numvideopages;
      if (videopages < 2)
      {
            at_enter(AT_STANDOUT);
            at_exit();
      } else
      {
            _setactivepage(1);
            at_enter(AT_STANDOUT);
            blanks = (char *) ecalloc(w.numtextcols, sizeof(char));
            for (col = 0;  col < w.numtextcols;  col++)
                  blanks[col] = ' ';
            for (row = w.numtextrows;  row > 0;  row--)
                  _outmem(blanks, w.numtextcols);
            _setactivepage(0);
            _setvisualpage(0);
            free(blanks);
            at_exit();
      }
#else
#if MSDOS_COMPILER==BORLANDC
      register int n;

      whitescreen = (unsigned short *) 
            malloc(sc_width * sc_height * sizeof(short));
      if (whitescreen == NULL)
            return;
      for (n = 0;  n < sc_width * sc_height;  n++)
            whitescreen[n] = 0x7020;
#else
#if MSDOS_COMPILER==WIN32C
      register int n;

      whitescreen = (WORD *)
            malloc(sc_height * sc_width * sizeof(WORD));
      if (whitescreen == NULL)
            return;
      /* Invert the standard colors. */
      for (n = 0;  n < sc_width * sc_height;  n++)
            whitescreen[n] = (WORD)((nm_fg_color << 4) | nm_bg_color);
#endif
#endif
#endif
      flash_created = 1;
}
#endif /* MSDOS_COMPILER */

/*
 * Output the "visual bell", if there is one.
 */
      public void
vbell()
{
#if !MSDOS_COMPILER
      if (*sc_visual_bell == '\0')
            return;
      tputs(sc_visual_bell, sc_height, putchr);
#else
#if MSDOS_COMPILER==DJGPPC
      ScreenVisualBell();
#else
#if MSDOS_COMPILER==MSOFTC
      /*
       * Create a flash screen on the second video page.
       * Switch to that page, then switch back.
       */
      if (!flash_created)
            create_flash();
      if (videopages < 2)
            return;
      _setvisualpage(1);
      delay(100);
      _setvisualpage(0);
#else
#if MSDOS_COMPILER==BORLANDC
      unsigned short *currscreen;

      /*
       * Get a copy of the current screen.
       * Display the flash screen.
       * Then restore the old screen.
       */
      if (!flash_created)
            create_flash();
      if (whitescreen == NULL)
            return;
      currscreen = (unsigned short *) 
            malloc(sc_width * sc_height * sizeof(short));
      if (currscreen == NULL) return;
      gettext(1, 1, sc_width, sc_height, currscreen);
      puttext(1, 1, sc_width, sc_height, whitescreen);
      delay(100);
      puttext(1, 1, sc_width, sc_height, currscreen);
      free(currscreen);
#else
#if MSDOS_COMPILER==WIN32C
      /* paint screen with an inverse color */
      clear();

      /* leave it displayed for 100 msec. */
      Sleep(100);

      /* restore with a redraw */
      repaint();
#endif
#endif
#endif
#endif
#endif
}

/*
 * Make a noise.
 */
      static void
beep()
{
#if !MSDOS_COMPILER
      putchr(CONTROL('G'));
#else
#if MSDOS_COMPILER==WIN32C
      MessageBeep(0);
#else
      write(1, "\7", 1);
#endif
#endif
}

/*
 * Ring the terminal bell.
 */
      public void
bell()
{
      if (quiet == VERY_QUIET)
            vbell();
      else
            beep();
}

/*
 * Clear the screen.
 */
      public void
clear()
{
#if !MSDOS_COMPILER
      tputs(sc_clear, sc_height, putchr);
#else
      flush();
#if MSDOS_COMPILER==WIN32C
      win32_clear();
#else
      _clearscreen(_GCLEARSCREEN);
#endif
#endif
}

/*
 * Clear from the cursor to the end of the cursor's line.
 * {{ This must not move the cursor. }}
 */
      public void
clear_eol()
{
#if !MSDOS_COMPILER
      tputs(sc_eol_clear, 1, putchr);
#else
#if MSDOS_COMPILER==MSOFTC
      short top, left;
      short bot, right;
      struct rccoord tpos;
      
      flush();
      /*
       * Save current state.
       */
      tpos = _gettextposition();
      _gettextwindow(&top, &left, &bot, &right);
      /*
       * Set a temporary window to the current line,
       * from the cursor's position to the right edge of the screen.
       * Then clear that window.
       */
      _settextwindow(tpos.row, tpos.col, tpos.row, sc_width);
      _clearscreen(_GWINDOW);
      /*
       * Restore state.
       */
      _settextwindow(top, left, bot, right);
      _settextposition(tpos.row, tpos.col);
#else
#if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
      flush();
      clreol();
#else
#if MSDOS_COMPILER==WIN32C
      DWORD           nchars;
      COORD           cpos;
      CONSOLE_SCREEN_BUFFER_INFO scr;

      flush();
      memset(&scr, 0, sizeof(scr));
      GetConsoleScreenBufferInfo(con_out, &scr);
      cpos.X = scr.dwCursorPosition.X;
      cpos.Y = scr.dwCursorPosition.Y;
      curr_attr = MAKEATTR(nm_fg_color, nm_bg_color);
      FillConsoleOutputAttribute(con_out, curr_attr,
            scr.dwSize.X - cpos.X, cpos, &nchars);
      FillConsoleOutputCharacter(con_out, ' ',
            scr.dwSize.X - cpos.X, cpos, &nchars);
#endif
#endif
#endif
#endif
}

/*
 * Clear the current line.
 * Clear the screen if there's off-screen memory below the display.
 */
      static void
clear_eol_bot()
{
#if MSDOS_COMPILER
      clear_eol();
#else
      if (below_mem)
            tputs(sc_eos_clear, 1, putchr);
      else
            tputs(sc_eol_clear, 1, putchr);
#endif
}

/*
 * Clear the bottom line of the display.
 * Leave the cursor at the beginning of the bottom line.
 */
      public void
clear_bot()
{
      /*
       * If we're in a non-normal attribute mode, temporarily exit
       * the mode while we do the clear.  Some terminals fill the
       * cleared area with the current attribute.
       */
      lower_left();
      if (attrmode == AT_NORMAL)
            clear_eol_bot();
      else
      {
            int saved_attrmode = attrmode;

            at_exit();
            clear_eol_bot();
            at_enter(saved_attrmode);
      }
}

      public void
at_enter(attr)
      int attr;
{
      attr = apply_at_specials(attr);

#if !MSDOS_COMPILER
      /* The one with the most priority is last.  */
      if (attr & AT_UNDERLINE)
            tputs(sc_u_in, 1, putchr);
      if (attr & AT_BOLD)
            tputs(sc_b_in, 1, putchr);
      if (attr & AT_BLINK)
            tputs(sc_bl_in, 1, putchr);
      if (attr & AT_STANDOUT)
            tputs(sc_s_in, 1, putchr);
#else
      flush();
      /* The one with the most priority is first.  */
      if (attr & AT_STANDOUT)
      {
            SETCOLORS(so_fg_color, so_bg_color);
      } else if (attr & AT_BLINK)
      {
            SETCOLORS(bl_fg_color, bl_bg_color);
      }
      else if (attr & AT_BOLD)
      {
            SETCOLORS(bo_fg_color, bo_bg_color);
      }
      else if (attr & AT_UNDERLINE)
      {
            SETCOLORS(ul_fg_color, ul_bg_color);
      }
#endif

      attrmode = attr;
}

      public void
at_exit()
{
#if !MSDOS_COMPILER
      /* Undo things in the reverse order we did them.  */
      if (attrmode & AT_STANDOUT)
            tputs(sc_s_out, 1, putchr);
      if (attrmode & AT_BLINK)
            tputs(sc_bl_out, 1, putchr);
      if (attrmode & AT_BOLD)
            tputs(sc_b_out, 1, putchr);
      if (attrmode & AT_UNDERLINE)
            tputs(sc_u_out, 1, putchr);
#else
      flush();
      SETCOLORS(nm_fg_color, nm_bg_color);
#endif

      attrmode = AT_NORMAL;
}

      public void
at_switch(attr)
      int attr;
{
      if (apply_at_specials(attr) != attrmode)
      {
            at_exit();
            at_enter(attr);
      }
}

      public int
is_at_equiv(attr1, attr2)
      int attr1;
      int attr2;
{
      attr1 = apply_at_specials(attr1);
      attr2 = apply_at_specials(attr2);

      return (attr1 == attr2);
}

      public int
apply_at_specials(attr)
      int attr;
{
      if (attr & AT_BINARY)
            attr |= binattr;
      if (attr & AT_HILITE)
            attr |= AT_STANDOUT;
      attr &= ~(AT_BINARY|AT_HILITE);

      return attr;
}

#if 0 /* No longer used */
/*
 * Erase the character to the left of the cursor 
 * and move the cursor left.
 */
      public void
backspace()
{
#if !MSDOS_COMPILER
      /* 
       * Erase the previous character by overstriking with a space.
       */
      tputs(sc_backspace, 1, putchr);
      putchr(' ');
      tputs(sc_backspace, 1, putchr);
#else
#if MSDOS_COMPILER==MSOFTC
      struct rccoord tpos;
      
      flush();
      tpos = _gettextposition();
      if (tpos.col <= 1)
            return;
      _settextposition(tpos.row, tpos.col-1);
      _outtext(" ");
      _settextposition(tpos.row, tpos.col-1);
#else
#if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
      cputs("\b");
#else
#if MSDOS_COMPILER==WIN32C
      COORD cpos;
      DWORD cChars;
      CONSOLE_SCREEN_BUFFER_INFO scr;

      flush();
      GetConsoleScreenBufferInfo(con_out, &scr);
      cpos = scr.dwCursorPosition;
      if (cpos.X <= 0)
            return;
      cpos.X--;
      SetConsoleCursorPosition(con_out, cpos);
      FillConsoleOutputCharacter(con_out, (TCHAR)' ', 1, cpos, &cChars);
      SetConsoleCursorPosition(con_out, cpos);
#endif
#endif
#endif
#endif
}
#endif /* 0 */

/*
 * Output a plain backspace, without erasing the previous char.
 */
      public void
putbs()
{
#if !MSDOS_COMPILER
      tputs(sc_backspace, 1, putchr);
#else
      int row, col;

      flush();
      {
#if MSDOS_COMPILER==MSOFTC
            struct rccoord tpos;
            tpos = _gettextposition();
            row = tpos.row;
            col = tpos.col;
#else
#if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
            row = wherey();
            col = wherex();
#else
#if MSDOS_COMPILER==WIN32C
            CONSOLE_SCREEN_BUFFER_INFO scr;
            GetConsoleScreenBufferInfo(con_out, &scr);
            row = scr.dwCursorPosition.Y - scr.srWindow.Top + 1;
            col = scr.dwCursorPosition.X - scr.srWindow.Left + 1;
#endif
#endif
#endif
      }
      if (col <= 1)
            return;
      _settextposition(row, col-1);
#endif /* MSDOS_COMPILER */
}

#if MSDOS_COMPILER==WIN32C
/*
 * Determine whether an input character is waiting to be read.
 */
      static int
win32_kbhit(tty)
      HANDLE tty;
{
      INPUT_RECORD ip;
      DWORD read;

      if (keyCount > 0)
            return (TRUE);

      currentKey.ascii = 0;
      currentKey.scan = 0;

      /*
       * Wait for a real key-down event, but
       * ignore SHIFT and CONTROL key events.
       */
      do
      {
            PeekConsoleInput(tty, &ip, 1, &read);
            if (read == 0)
                  return (FALSE);
            ReadConsoleInput(tty, &ip, 1, &read);
      } while (ip.EventType != KEY_EVENT ||
            ip.Event.KeyEvent.bKeyDown != TRUE ||
            ip.Event.KeyEvent.wVirtualScanCode == 0 ||
            ip.Event.KeyEvent.wVirtualKeyCode == VK_SHIFT ||
            ip.Event.KeyEvent.wVirtualKeyCode == VK_CONTROL ||
            ip.Event.KeyEvent.wVirtualKeyCode == VK_MENU);
            
      currentKey.ascii = ip.Event.KeyEvent.uChar.AsciiChar;
      currentKey.scan = ip.Event.KeyEvent.wVirtualScanCode;
      keyCount = ip.Event.KeyEvent.wRepeatCount;

      if (ip.Event.KeyEvent.dwControlKeyState & 
            (LEFT_ALT_PRESSED | RIGHT_ALT_PRESSED))
      {
            switch (currentKey.scan)
            {
            case PCK_ALT_E:     /* letter 'E' */
                  currentKey.ascii = 0;
                  break;
            }
      } else if (ip.Event.KeyEvent.dwControlKeyState & 
            (LEFT_CTRL_PRESSED | RIGHT_CTRL_PRESSED))
      {
            switch (currentKey.scan)
            {
            case PCK_RIGHT: /* right arrow */
                  currentKey.scan = PCK_CTL_RIGHT;
                  break;
            case PCK_LEFT: /* left arrow */
                  currentKey.scan = PCK_CTL_LEFT;
                  break;
            case PCK_DELETE: /* delete */
                  currentKey.scan = PCK_CTL_DELETE;
                  break;
            }
      }
      return (TRUE);
}

/*
 * Read a character from the keyboard.
 */
      public char
WIN32getch(tty)
      int tty;
{
      int ascii;

      if (pending_scancode)
      {
            pending_scancode = 0;
            return ((char)(currentKey.scan & 0x00FF));
      }

      while (win32_kbhit((HANDLE)tty) == FALSE)
      {
            Sleep(20);
            if (ABORT_SIGS())
                  return ('\003');
            continue;
      }
      keyCount --;
      ascii = currentKey.ascii;
      /*
       * On PC's, the extended keys return a 2 byte sequence beginning 
       * with '00', so if the ascii code is 00, the next byte will be 
       * the lsb of the scan code.
       */
      pending_scancode = (ascii == 0x00);
      return ((char)ascii);
}
#endif

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