/*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
/*	  All Rights Reserved  	*/

/*	THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF AT&T	*/
/*	The copyright notice above does not evidence any   	*/
/*	actual or intended publication of such source code.	*/

#ident	"@(#)display.c	1.3	94/10/04 SMI"	/* SVr4.0 1.3	*/

/*
 * +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 * 		PROPRIETARY NOTICE (Combined)
 *
 * This source code is unpublished proprietary information
 * constituting, or derived under license from AT&T's UNIX(r) System V.
 * In addition, portions of such source code were derived from Berkeley
 * 4.3 BSD under license from the Regents of the University of
 * California.
 *
 *
 *
 * 		Copyright Notice
 *
 * Notice of copyright on this source code product does not indicate
 * publication.
 *
 * 	(c) 1986,1987,1988.1989  Sun Microsystems, Inc
 * 	(c) 1983,1984,1985,1986,1987,1988,1989  AT&T.
 *	All rights reserved.
 *
 */


/*
 * The window 'manager', initializes curses and handles the actual
 * displaying of text
 */

#include "talk.h"
#include <ctype.h>

static int readwin(WINDOW *, int, int);
static void xscroll(register xwin_t *, int);

xwin_t my_win;
xwin_t rem_win;
WINDOW *line_win;

int curses_initialized = 0;

/*
 * max HAS to be a function, it is called with
 * a argument of the form --foo at least once.
 */

static int
max(a, b)
int a, b;
{
	if (a > b) {
	return (a);
	} else {
	return (b);
	}
}

/*
 * Display some text on somebody's window, processing some control
 * characters while we are at it.
 */

int
display(win, text, size)
register xwin_t *win;
register char *text;
int size;
{
	register int i;
	int mb_cur_max = MB_CUR_MAX;

	for (i = 0; i < size; i++) {
	int itext;

	if (*text == '\n'|| *text == '\r') {
		xscroll(win, 0);
		text++;
		continue;
	}

		/* erase character */

	if (*text == win->cerase) {
		wmove(win->x_win, win->x_line, max(--win->x_col, 0));
		getyx(win->x_win, win->x_line, win->x_col);
		waddch(win->x_win, ' ');
		wmove(win->x_win, win->x_line, win->x_col);
		getyx(win->x_win, win->x_line, win->x_col);
		text++;
		continue;
	}
	/*
	 * On word erase search backwards until we find
	 * the beginning of a word or the beginning of
	 * the line.
	 */
	if (*text == win->werase) {
		int endcol, xcol, i, c;

		endcol = win->x_col;
		xcol = endcol - 1;
		while (xcol >= 0) {
		c = readwin(win->x_win, win->x_line, xcol);
		if (c != ' ')
			break;
		xcol--;
		}
		while (xcol >= 0) {
		c = readwin(win->x_win, win->x_line, xcol);
		if (c == ' ')
			break;
		xcol--;
		}
		wmove(win->x_win, win->x_line, xcol + 1);
		for (i = xcol + 1; i < endcol; i++)
		waddch(win->x_win, ' ');
		wmove(win->x_win, win->x_line, xcol + 1);
		getyx(win->x_win, win->x_line, win->x_col);
		continue;
	}
		/* line kill */
	if (*text == win->kill) {
		wmove(win->x_win, win->x_line, 0);
		wclrtoeol(win->x_win);
		getyx(win->x_win, win->x_line, win->x_col);
		text++;
		continue;
	}
	if (*text == '\f') {
		if (win == &my_win)
		wrefresh(curscr);
		text++;
		continue;
	}
	/* EOF character */
	if (*text == '\004') {
		quit();
	}

	/* typing alert character will alert recipient's terminal */

	if (*text == '\007') {
		beep();
		continue;
	}

	/* check for wrap around */
	if (win->x_col == COLS-1) {
		xscroll(win, 0);
	}

	/*
	 * Handle the multibyte case
	 * We print '?' for nonprintable widechars.
	 */

	if (mb_cur_max > 1 && mblen(text, mb_cur_max) > 1) {
		wchar_t wc;
		int len;

		len = mbtowc(&wc, text, mb_cur_max);

		if (iswprint(wc) || iswspace(wc)) {
		/* its printable, put out the bytes */
			do {
				if (win->x_col == COLS-1) /* wraparound */
					xscroll(win, 0);
				waddch(win->x_win, *text++);
				getyx(win->x_win, win->x_line, win->x_col);
			} while (--len > 0);
			continue;
		}
		/*
		* otherwise, punt and print a question mark.
		*/
		text += len;
		waddch(win->x_win, '?');
		getyx(win->x_win, win->x_line, win->x_col);
		continue;
	}

	itext = (unsigned int) *text;
	if (isprint(itext) || *text == ' ' || *text == '\t' ||
		*text == '\013' || *text == '\007' /* bell */) {
		waddch(win->x_win, *text);
	} else {

		if (!isascii(*text)) {
			/* check for wrap around */
			if (win->x_col == COLS-3) {
				xscroll(win, 0);
			}
			waddch(win->x_win, 'M');
			waddch(win->x_win, '-');
			*text = toascii(*text);
		}
		if (iscntrl(*text)) {

			/* check for wrap around */
			getyx(win->x_win, win->x_line, win->x_col);
			if (win->x_col == COLS-2) {
				xscroll(win, 0);
			}

			waddch(win->x_win, '^');
			waddch(win->x_win, *text + 0100);
		}
		else
			waddch(win->x_win, *text);
	}

	getyx(win->x_win, win->x_line, win->x_col);
	text++;

	}  /* for loop */
	wrefresh(win->x_win);
	return (0);
}

/*
* Read the character at the indicated position in win
*/

static int
readwin(win, line, col)
WINDOW *win;
int line, col;
{
int oldline, oldcol;
register int c;

	getyx(win, oldline, oldcol);
	wmove(win, line, col);
	c = winch(win);
	wmove(win, oldline, oldcol);
	return (c);
}

/*
* Scroll a window, blanking out the line following the current line
* so that the current position is obvious
*/

static void
xscroll(win, flag)
register xwin_t *win;
int flag;
{
	if (flag == -1) {
		wmove(win->x_win, 0, 0);
		win->x_line = 0;
		win->x_col = 0;
		return;
	}
	win->x_line = (win->x_line + 1) % win->x_nlines;
	win->x_col = 0;
	wmove(win->x_win, win->x_line, win->x_col);
	wclrtoeol(win->x_win);
	wmove(win->x_win, (win->x_line + 1) % win->x_nlines, win->x_col);
	wclrtoeol(win->x_win);
	wmove(win->x_win, win->x_line, win->x_col);
}
