/* Copyright (c) 1979 Regents of the University of California */
/*
 * Capabilities from termcap
 *
 * The description of terminals is a difficult business, and we only
 * attempt to summarize the capabilities here;  for a full description
 * see the paper describing termcap.
 *
 * Capabilities from termcap are of three kinds - string valued options,
 * numeric valued options, and boolean options.  The string valued options
 * are the most complicated, since they may include padding information,
 * which we describe now.
 *
 * Intelligent terminals often require padding on intelligent operations
 * at high (and sometimes even low) speed.  This is specified by
 * a number before the string in the capability, and has meaning for the
 * capabilities which have a P at the front of their comment.
 * This normally is a number of milliseconds to pad the operation.
 * In the current system which has no true programmible delays, we
 * do this by sending a sequence of pad characters (normally nulls, but
 * specifiable as "pc").  In some cases, the pad is better computed
 * as some number of milliseconds times the number of affected lines
 * (to bottom of screen usually, except when terminals have insert modes
 * which will shift several lines.)  This is specified as '12*' e.g.
 * before the capability to say 12 milliseconds per affected whatever
 * (currently always line).  Capabilities where this makes sense say P*.
 */
char	tspace[256];		/* Space for capability strings */
char	*aoftspace;		/* Address of tspace for relocation */

char	*AL;			/* P* Add new blank line */
char	*BC;			/*    Back cursor */
char	*BT;			/* P  Back tab */
char	*CD;			/* P* Clear to end of display */
char	*CE;			/* P  Clear to end of line */
char	*CL;			/* P* Clear screen */
char	*CM;			/* P  Cursor motion */
char	*xCR;			/* P  Carriage return */
char	*DC;			/* P* Delete character */
char	*DL;			/* P* Delete line sequence */
char	*DM;			/*    Delete mode (enter)  */
char	*DO;			/*    Down line sequence */
char	*ED;			/*    End delete mode */
char	*EI;			/*    End insert mode */
char	*HO;			/*    Home cursor */
char	*IC;			/* P  Insert character */
char	*IM;			/*    Insert mode (give as ':im=:' if 'ic' */
char	*IP;			/* P* Insert pad after char ins'd using IM+IE */
char	*LL;			/*    Quick to last line, column 0 */
char	*MA;			/*    Control character map for cmd mode */
char	*ND;			/*    Non-destructive space */
char	*xNL;			/*    Line feed (new line) */
char	PC;			/*    Pad character */
char	*SE;			/*    Standout end (may leave space) */
char	*SF;			/* P  Scroll forwards */
char	*SO;			/*    Stand out begin (may leave space) */
char	*SR;			/* P  Scroll backwards */
char	*TA;			/* P  Tab (other than ^I or with padding) */
char	*TE;			/*    Terminal end sequence */
char	*TI;			/*    Terminal initial sequence */
char	*UP;			/*    Upline */
char	*VB;			/*    Visible bell */
char	*VE;			/*    Visual end sequence */
char	*VS;			/*    Visual start sequence */
bool	AM;			/* Automatic margins */
bool	BS;			/* Backspace works */
bool	CA;			/* Cursor addressible */
bool	DA;			/* Display may be retained above */
bool	DB;			/* Display may be retained below */
bool	EO;			/* Can erase overstrikes with ' ' */
bool	GT;			/* Gtty indicates tabs */
bool	HC;			/* Hard copy terminal */
bool	HZ;			/* Hazeltine ~ braindamage */
bool	IN;			/* Insert-null blessing */
bool	MI;			/* can move in insert mode */
bool	NC;			/* No Cr - \r snds \r\n then eats \n (dm2500) */
bool	NS;			/* No scroll - linefeed at bottom won't scroll */
bool	OS;			/* Overstrike works */
bool	UL;			/* Underlining works even though !os */
bool	XB;			/* Beehive superbee f1=esc, f2=^C */
bool	XN;			/* A newline gets eaten after wrap (concept) */
bool	XT;			/* Tabs are destructive */
bool	XX;			/* Tektronix 4025/4027 */
	/* X? is reserved for severely nauseous glitches */
	/* If there are enough of these we may need bit masks! */

/*
 * From the tty modes...
 */
bool	NONL;			/* Terminal can't hack linefeeds doing a CR */
bool	UPPERCASE;		/* Ick! */
short	LINES;			/* Number of lines on screen */
short	COLUMNS;
short	OCOLUMNS;		/* Save COLUMNS for a hack in open mode */

short	outcol;			/* Where the cursor is */
short	outline;

short	destcol;		/* Where the cursor should be */
short	destline;

/*
 * There are several kinds of tty drivers to contend with.  These include:
 * (1)	V6:		no CBREAK, no ioctl.  (Include PWB V1 here.)
 * (2)	V7 research:	has CBREAK, has ioctl, and has the tchars (TIOCSETC)
 *			business to change start, stop, etc. chars.
 * (3)	USG V2:		Basically like V6 but RAW mode is like V7 RAW.
 *			(We treat it as V6.)
 * (4)	USG V3:		equivalent to V7 but totally incompatible.
 *
 * The following attempts to decide what we are on, and declare
 * some variables in the appropriate format.  The wierd looking one (ttymode)
 * is the thing we pass to sTTY and family to turn "RAW" mode on or off
 * when we go into or out of visual mode.  In V7/V6 it's just the flags word
 * to stty.  In USG V3 it's the whole tty structure.
 */
#ifdef USG3TTY
	struct	termio	tty;	/* Use this one structure to change modes */
	typedef	struct termio ttymode;	/* Mode to contain tty flags */
#else
	struct	sgttyb tty;	/* Always stty/gtty using this one structure */
	typedef	int	ttymode;	/* Mode to contain tty flags */
# ifdef 	TIOCSETC
	struct	tchars ottyc, nttyc;	/* For V7 character masking */
# endif
#endif
ttymode	normf;			/* Restore tty flags to this (someday) */
bool	normtty;		/* Have to restor normal mode from normf */

ttymode ostart(), setty(), unixex();

short	WBOT;
short	WECHO;

short	costCM;