GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: usr.bin/talk/display.c Lines: 0 82 0.0 %
Date: 2017-11-13 Branches: 0 72 0.0 %

Line Branch Exec Source
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/*	$OpenBSD: display.c,v 1.18 2016/02/01 07:29:25 mestre Exp $	*/
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/*	$NetBSD: display.c,v 1.3 1994/12/09 02:14:13 jtc Exp $	*/
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/*
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 * Copyright (c) 1983, 1993
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 *	The Regents of the University of California.  All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 * 1. Redistributions of source code must retain the above copyright
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 *    notice, this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright
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 *    notice, this list of conditions and the following disclaimer in the
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 *    documentation and/or other materials provided with the distribution.
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 * 3. Neither the name of the University nor the names of its contributors
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 *    may be used to endorse or promote products derived from this software
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 *    without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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 * SUCH DAMAGE.
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 */
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/*
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 * The window 'manager', initializes curses and handles the actual
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 * displaying of text
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 */
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#include <ctype.h>
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#include "talk.h"
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xwin_t	my_win;
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xwin_t	his_win;
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WINDOW	*line_win;
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int	curses_initialized;
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int	high_print;
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bool	smooth_scroll;
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/*
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 * max HAS to be a function, it is called with
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 * an argument of the form --foo at least once.
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 */
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int
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max(int a, int b)
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{
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	return (a > b ? a : b);
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}
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/*
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 * Display some text on somebody's window, processing some control
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 * characters while we are at it.
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 */
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void
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display(xwin_t *win, char *text, int size)
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{
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	int i;
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	char cch;
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	for (i = 0; i < size; i++) {
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		/*
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		 * Since we do not use curses's input routines we must
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		 * convert '\r' -> '\n' ourselves.
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		 */
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		if (*text == '\r')
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			*text = '\n';
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		if (*text == '\n') {
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			xscroll(win, 0);
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			text++;
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			continue;
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		}
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		/* erase character */
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		if (*text == win->cerase) {
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			wmove(win->x_win, win->x_line, max(--win->x_col, 0));
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			getyx(win->x_win, win->x_line, win->x_col);
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			waddch(win->x_win, ' ');
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			wmove(win->x_win, win->x_line, win->x_col);
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			getyx(win->x_win, win->x_line, win->x_col);
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			text++;
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			continue;
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		}
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		/*
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		 * On word erase search backwards until we find
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		 * the beginning of a word or the beginning of
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		 * the line.
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		 */
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		if (*text == win->werase) {
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			int endcol, xcol, i, c;
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			endcol = win->x_col;
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			xcol = endcol - 1;
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			while (xcol >= 0) {
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				c = readwin(win->x_win, win->x_line, xcol);
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				if (c != ' ')
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					break;
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				xcol--;
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			}
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			while (xcol >= 0) {
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				c = readwin(win->x_win, win->x_line, xcol);
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				if (c == ' ')
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					break;
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				xcol--;
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			}
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			wmove(win->x_win, win->x_line, xcol + 1);
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			for (i = xcol + 1; i < endcol; i++)
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				waddch(win->x_win, ' ');
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			wmove(win->x_win, win->x_line, xcol + 1);
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			getyx(win->x_win, win->x_line, win->x_col);
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			text++;
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			continue;
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		}
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		/* line kill */
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		if (*text == win->kill) {
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			wmove(win->x_win, win->x_line, 0);
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			wclrtoeol(win->x_win);
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			getyx(win->x_win, win->x_line, win->x_col);
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			text++;
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			continue;
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		}
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		if (*text == '\f') {
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			if (win == &my_win)
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				wrefresh(curscr);
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			text++;
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			continue;
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		}
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		if (win->x_col == COLS-1) {
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			/* check for wraparound */
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			xscroll(win, 0);
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		}
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		if (*text != '\t' &&
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		    ((!high_print && !isprint((unsigned char)*text)) ||
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		      iscntrl((unsigned char)*text))) {
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			waddch(win->x_win, '^');
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			getyx(win->x_win, win->x_line, win->x_col);
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			if (win->x_col == COLS-1) /* check for wraparound */
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				xscroll(win, 0);
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			cch = (*text & 63) + 64;
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			waddch(win->x_win, cch);
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		} else
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			waddch(win->x_win, (unsigned char)(*text));
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		getyx(win->x_win, win->x_line, win->x_col);
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		text++;
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	}
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	wrefresh(win->x_win);
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}
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/*
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 * Read the character at the indicated position in win
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 */
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int
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readwin(WINDOW *win, int line, int col)
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{
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	int oldline, oldcol;
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	int c;
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	getyx(win, oldline, oldcol);
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	wmove(win, line, col);
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	c = winch(win);
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	wmove(win, oldline, oldcol);
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	return (c);
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}
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/*
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 * Scroll a window, blanking out the line following the current line
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 * so that the current position is obvious
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 */
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void
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xscroll(xwin_t *win, int flag)
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{
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	if (flag == -1) {
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		wmove(win->x_win, 0, 0);
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		win->x_line = 0;
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		win->x_col = 0;
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		return;
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	}
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	win->x_col = 0;
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	if (smooth_scroll) {
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		if (++win->x_line == win->x_nlines) {
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			--win->x_line;
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			scroll(win->x_win);
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		}
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	} else {
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		win->x_line = (win->x_line + 1) % win->x_nlines;
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		wmove(win->x_win, win->x_line, win->x_col);
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		wclrtoeol(win->x_win);
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		wmove(win->x_win, (win->x_line + 1) % win->x_nlines,
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		    win->x_col);
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		wclrtoeol(win->x_win);
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	}
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	wmove(win->x_win, win->x_line, win->x_col);
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}