1 files changed, 2471 insertions, 0 deletions

diff --git a/screen.c b/screen.c
new file mode 100644
index 000000000000..8e3a0607c666
--- /dev/null
+++ b/screen.c
@@ -0,0 +1,2471 @@
+/*
+ * Copyright (C) 1984-2007  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_return,		/* Cursor to beginning of current line */
+	*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;
+extern int oldbot;
+#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];
+	char *s;
+
+	s = lgetenv("LESS_TERMCAP_DEBUG");
+	if (s != NULL && *s != '\0')
+	{
+		struct env { struct env *next; char *name; char *value; };
+		static struct env *envs = NULL;
+		struct env *p;
+		for (p = envs;  p != NULL;  p = p->next)
+			if (strcmp(p->name, capname) == 0)
+				return p->value;
+		p = (struct env *) ecalloc(1, sizeof(struct env));
+		p->name = save(capname);
+		p->value = (char *) ecalloc(strlen(capname)+3, sizeof(char));
+		sprintf(p->value, "<%s>", capname);
+		p->next = envs;
+		envs = p;
+		return p->value;
+	}
+	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) != TGETENT_OK)
+ 		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");
+
+	/*
+	 * Get carriage return string.
+	 */
+	sc_return = ltgetstr("cr", &sp);
+	if (sc_return == NULL)
+		sc_return = "\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
+}
+
+/*
+ * Move cursor to left position of current line.
+ */
+	public void
+line_left()
+{
+#if !MSDOS_COMPILER
+	tputs(sc_return, 1, putchr);
+#else
+	int row;
+	flush();
+#if MSDOS_COMPILER==WIN32C
+	{
+		CONSOLE_SCREEN_BUFFER_INFO scr;
+		GetConsoleScreenBufferInfo(con_out, &scr);
+		row = scr.dwCursorPosition.Y - scr.srWindow.Top + 1;
+	}
+#else
+#if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
+		row = wherey();
+#else
+	{
+		struct rccoord tpos = _gettextposition();
+		row = tpos.row;
+	}
+#endif
+#endif
+	_settextposition(row, 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.
+	 */
+	if (oldbot)
+		lower_left();
+	else
+		line_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;
+{
+	int new_attrmode = apply_at_specials(attr);
+	int ignore_modes = AT_ANSI;
+
+	if ((new_attrmode & ~ignore_modes) != (attrmode & ~ignore_modes))
+	{
+		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