/*
 * @(#)ww.h	3.37.1 1996/3/22
 */

/*
 * Copyright (c) 1983 Regents of the University of California,
 * All rights reserved.  Redistribution permitted subject to
 * the terms of the Berkeley Software License Agreement.
 */

#include <sgtty.h>
#include <setjmp.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>

#ifdef pdp11
#define NWW	9		/* maximum number of windows */
#else
#define NWW	30		/* maximum number of windows */
#endif

	/* a rectangle */
struct ww_dim {
	int nr;			/* number of rows */
	int nc;			/* number of columns */
	int t, b;		/* top, bottom */
	int l, r;		/* left, right */
};

	/* a coordinate */
struct ww_pos {
	int r;			/* row */
	int c;			/* column */
};

	/* the window structure */
struct ww {
		/* general flags and states */
	char ww_state;		/* state of window */
	char ww_oflags;		/* wwopen flags */

		/* information for overlap */
	struct ww *ww_forw;	/* doubly linked list, for overlapping info */
	struct ww *ww_back;
	char ww_index;		/* the window index, for wwindex[] */
	char ww_order;		/* the overlapping order */

		/* sizes and positions */
	struct ww_dim ww_w;	/* window size and pos */
	struct ww_dim ww_b;	/* buffer size and pos */
	struct ww_dim ww_i;	/* the part inside the screen */
	struct ww_pos ww_cur;	/* the cursor position, relative to ww_w */

		/* arrays */
	char **ww_win;		/* the window */
	union ww_char **ww_buf;	/* the buffer */
	char **ww_fmap;		/* map for frame and box windows */
	short *ww_nvis;		/* how many ww_buf chars are visible per row */

		/* information for wwwrite() and company */
	char ww_wstate;		/* state for outputting characters */
	char ww_modes;		/* current display modes */
	char ww_insert;		/* insert mode */
	char ww_mapnl;		/* map \n to \r\n */
	char ww_noupdate;	/* don't do updates in wwwrite() */
	char ww_unctrl;		/* expand control characters */
	char ww_nointr;		/* wwwrite() not interruptable */
	char ww_hascursor;	/* has fake cursor */

		/* things for the window process and io */
	char ww_ispty;		/* ww_pty is really a pty, not socket pair */
	char ww_stopped;	/* output stopped */
	int ww_pty;		/* file descriptor of pty or socket pair */
	int ww_socket;		/* other end of socket pair */
	int ww_pid;		/* pid of process, if WWS_HASPROC true */
	char ww_ttyname[11];	/* "/dev/ttyp?" */
	char *ww_ob;		/* output buffer */
	char *ww_obe;		/* end of ww_ob */
	char *ww_obp;		/* current read position in ww_ob */
	char *ww_obq;		/* current write position in ww_ob */

		/* things for the user, they really don't belong here */
	char ww_id;		/* the user window id */
	char ww_center;		/* center the label */
	char ww_hasframe;	/* frame it */
	char *ww_label;		/* the user supplied label */
	struct ww_dim ww_alt;	/* alternate position and size */
};

	/* state of a tty */
struct ww_tty {
	struct sgttyb ww_sgttyb;
	struct tchars ww_tchars;
	struct ltchars ww_ltchars;
	int ww_lmode;
	int ww_ldisc;
	int ww_fflags;
};

union ww_char {
	short c_w;		/* as a word */
	struct {
#ifndef mc68000
		char C_c;	/* the character part */
		char C_m;	/* the mode part */
#else
		char C_m;	/* the mode part */
		char C_c;	/* the character part */
#endif
	} c_un;
};
#define c_c c_un.C_c
#define c_m c_un.C_m

	/* parts of ww_char */
#define WWC_CMASK	0x00ff
#define WWC_MMASK	0xff00
#define WWC_MSHIFT	8

	/* c_m bits */
#define WWM_REV		0x01	/* reverse video */
#define WWM_BLK		0x02	/* blinking */
#define WWM_UL		0x04	/* underlined */
#define WWM_GRP		0x08	/* graphics */
#define WWM_USR		0x10	/* user specified mode */
#define WWM_GLS		0x40	/* window only, glass, i.e. transparent */

	/* ww_state values */
#define WWS_INITIAL	0	/* just opened */
#define WWS_HASPROC	1	/* has process on pty */
#define WWS_DEAD	3	/* child died */

	/* flags for ww_fmap */
#define WWF_U		0x01
#define WWF_R		0x02
#define WWF_D		0x04
#define WWF_L		0x08
#define WWF_MASK	(WWF_U|WWF_R|WWF_D|WWF_L)
#define WWF_LABEL	0x40
#define WWF_TOP		0x80

	/* flags to wwopen() */
#define WWO_PTY		0x01		/* want pty */
#define WWO_SOCKET	0x02		/* want socket pair */
#define WWO_REVERSE	0x04		/* make it all reverse video */
#define WWO_GLASS	0x08		/* make it all glass */
#define WWO_FRAME	0x10		/* this is a frame window */

	/* special ww_index value */
#define WWX_NOBODY	NWW

	/* error codes */
#define WWE_NOERR	0
#define WWE_SYS		1		/* system error */
#define WWE_NOMEM	2		/* out of memory */
#define WWE_TOOMANY	3		/* too many windows */
#define WWE_NOPTY	4		/* no more ptys */
#define WWE_SIZE	5		/* bad window size */
#define WWE_BADTERM	6		/* bad terminal type */
#define WWE_CANTDO	7		/* dumb terminal */

	/* wwtouched[] bits */
#define WWU_TOUCHED	0x01		/* touched */
#define WWU_MAJOR	0x02		/* major change */

	/* the window structures */
struct ww wwhead;
struct ww *wwindex[NWW + 1];		/* last location is for wwnobody */
struct ww wwnobody;

	/* tty things */
struct ww_tty wwoldtty;		/* the old (saved) terminal settings */
struct ww_tty wwnewtty;		/* the new (current) terminal settings */
struct ww_tty wwwintty;		/* the terminal settings for windows */
char *wwterm;			/* the terminal name */
#ifdef pdp11
	/* these are on the stack; see main.c */
char *wwtermcap;		/* place for the termcap */
char *wwkeys;			/* termcap fields for the function keys */
char *wwwintermcap;		/* termcap for windows */
#else
char wwtermcap[1024];		/* place for the termcap */
char wwkeys[512];		/* termcap fields for the function keys */
char wwwintermcap[1024];	/* termcap for windows */
#endif

	/* generally useful variables */
int wwnrow, wwncol;		/* the screen size */
char wwavailmodes;		/* actually supported modes */
char wwcursormodes;		/* the modes for the fake cursor */
char wwwrap;			/* terminal has auto wrap around */
int wwdtablesize;		/* result of getdtablesize() call */
char **wwsmap;			/* the screen map */
union ww_char **wwos;		/* the old (current) screen */
union ww_char **wwns;		/* the new (desired) screen */
char *wwtouched;		/* wwns changed flags */
int wwbaudmap[];		/* maps stty() baud rate code into number */
unsigned wwbaud;		/* wwbaudmap[wwoldtty.ww_sgttyb.sg_ospeed] */
int wwcursorrow, wwcursorcol;	/* where we want the cursor to be */
int wwerrno;			/* error number */

	/* statistics */
int wwnflush, wwnwr, wwnwre, wwnwrz, wwnwrc;
int wwnwwr, wwnwwra, wwnwwrc;
int wwnupdate, wwnupdline, wwnupdmiss, wwnmajline, wwnmajmiss;
int wwnread, wwnreade, wwnreadz, wwnreadc;
int wwnwread, wwnwreade, wwnwreadz, wwnwreadd, wwnwreadc, wwnwreadp;
int wwnselect, wwnselecte, wwnselectz;

	/* quicky macros */
#define wwsetcursor(r,c) (wwcursorrow = (r), wwcursorcol = (c))
#define wwcurtowin(w)	wwsetcursor((w)->ww_cur.r, (w)->ww_cur.c)
#define wwunbox(w)	wwunframe(w)
#define wwclreol(w,r,c)	wwclreol1((w), (r), (c), 0)
#define wwredrawwin(w)	wwredrawwin1((w), (w)->ww_i.t, (w)->ww_i.b, 0)
#define wwupdate()	wwupdate1(0, wwnrow);

	/* things for handling input */
int wwrint();		/* interrupt handler */
struct ww *wwcurwin;	/* window to copy input into */
char wwsetjmp;		/* want a longjmp() from wwrint() */
jmp_buf wwjmpbuf;	/* jmpbuf for above */
char *wwib;		/* input (keyboard) buffer */
char *wwibe;		/* wwib + sizeof buffer */
char *wwibp;		/* current read position in buffer */
char *wwibq;		/* current write position in buffer */
#define wwgetc()	(wwibp < wwibq ? *wwibp++ & 0x7f : -1)
#define wwpeekc()	(wwibp < wwibq ? *wwibp & 0x7f : -1)
#define wwungetc(c)	(wwibp > wwib ? *--wwibp = (c) : -1)
#define wwinterrupt()	(wwibp < wwibq)

	/* the window virtual terminal */
#define WWT_TERM	"TERM=window"
#define WWT_TERMCAP	"WW|window|window package:\
	:cr=^M:nl=^J:bl=^G:\
	:al=\\EL:am:le=^H:bs:cd=\\EJ:ce=\\EK:cl=\\EE:cm=\\EY%+ %+ :\
	:da:db:dc=\\EN:dl=\\EM:do=\\EB:ei=\\EO:ho=\\EH:im=\\E@:mi:\
	:nd=\\EC:ta=^I:pt:up=\\EA:"
#define WWT_REV		"se=\\Eq:so=\\Ep:"
#define WWT_UL		"ue=\\Es:us=\\Er:"
#define WWT_GRP		"ae=\\EG:as=\\EF:"
#define WWT_USR		"XE=\\EQ:XS=\\EP:"

	/* our functions */
struct ww *wwopen();
int wwchild();
int wwsuspend();
char **wwalloc();
char *wwerror();

	/* c library functions */
char *tgetstr();

#undef MIN
#undef MAX
#define MIN(x, y)	((x) > (y) ? (y) : (x))
#define MAX(x, y)	((x) > (y) ? (x) : (y))
