display.c revision 178642 
1/*
2 * Copyright (c) 1983, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#include <sys/cdefs.h>
35
36__FBSDID("$FreeBSD: head/usr.bin/talk/display.c 178642 2008-04-28 21:08:42Z delphij $");
37
38#ifndef lint
39static const char sccsid[] = "@(#)display.c	8.1 (Berkeley) 6/6/93";
40#endif
41
42/*
43 * The window 'manager', initializes curses and handles the actual
44 * displaying of text
45 */
46#include <ctype.h>
47
48#include "talk.h"
49
50xwin_t	my_win;
51xwin_t	his_win;
52WINDOW	*line_win;
53
54int	curses_initialized = 0;
55
56/*
57 * max HAS to be a function, it is called with
58 * an argument of the form --foo at least once.
59 */
60int
61max(int a, int b)
62{
63
64	return (a > b ? a : b);
65}
66
67/*
68 * Display some text on somebody's window, processing some control
69 * characters while we are at it.
70 */
71void
72display(xwin_t *win, char *text, int size)
73{
74	int i;
75	char cch;
76
77	for (i = 0; i < size; i++) {
78		if (*text == '\n' || *text == '\r') {
79			waddch(win->x_win, '\n');
80			getyx(win->x_win, win->x_line, win->x_col);
81			text++;
82			continue;
83		}
84		if (*text == 004 && win == &my_win) {
85			/* control-D clears the screen */
86			werase(my_win.x_win);
87			getyx(my_win.x_win, my_win.x_line, my_win.x_col);
88			wrefresh(my_win.x_win);
89			werase(his_win.x_win);
90			getyx(his_win.x_win, his_win.x_line, his_win.x_col);
91			wrefresh(his_win.x_win);
92			text++;
93			continue;
94		}
95
96		/* erase character */
97		if (   *text == win->cerase
98		    || *text == 010     /* BS */
99		    || *text == 0177    /* DEL */
100		   ) {
101			wmove(win->x_win, win->x_line, max(--win->x_col, 0));
102			getyx(win->x_win, win->x_line, win->x_col);
103			waddch(win->x_win, ' ');
104			wmove(win->x_win, win->x_line, win->x_col);
105			getyx(win->x_win, win->x_line, win->x_col);
106			text++;
107			continue;
108		}
109		/*
110		 * On word erase search backwards until we find
111		 * the beginning of a word or the beginning of
112		 * the line.
113		 */
114		if (   *text == win->werase
115		    || *text == 027     /* ^W */
116		   ) {
117			int endcol, xcol, ii, c;
118
119			endcol = win->x_col;
120			xcol = endcol - 1;
121			while (xcol >= 0) {
122				c = readwin(win->x_win, win->x_line, xcol);
123				if (c != ' ')
124					break;
125				xcol--;
126			}
127			while (xcol >= 0) {
128				c = readwin(win->x_win, win->x_line, xcol);
129				if (c == ' ')
130					break;
131				xcol--;
132			}
133			wmove(win->x_win, win->x_line, xcol + 1);
134			for (ii = xcol + 1; ii < endcol; ii++)
135				waddch(win->x_win, ' ');
136			wmove(win->x_win, win->x_line, xcol + 1);
137			getyx(win->x_win, win->x_line, win->x_col);
138			text++;
139			continue;
140		}
141		/* line kill */
142		if (   *text == win->kill
143		    || *text == 025     /* ^U */
144		   ) {
145			wmove(win->x_win, win->x_line, 0);
146			wclrtoeol(win->x_win);
147			getyx(win->x_win, win->x_line, win->x_col);
148			text++;
149			continue;
150		}
151		if (*text == '\f') {
152			if (win == &my_win)
153				wrefresh(curscr);
154			text++;
155			continue;
156		}
157		if (*text == '\7') {
158			write(STDOUT_FILENO, text, 1);
159			text++;
160			continue;
161		}
162		if (!isprint((unsigned char)*text) && *text != '\t') {
163			waddch(win->x_win, '^');
164			getyx(win->x_win, win->x_line, win->x_col);
165			cch = (*text & 63) + 64;
166			waddch(win->x_win, cch);
167		} else
168			waddch(win->x_win, (unsigned char)*text);
169		getyx(win->x_win, win->x_line, win->x_col);
170		text++;
171	}
172	wrefresh(win->x_win);
173}
174
175/*
176 * Read the character at the indicated position in win
177 */
178int
179readwin(WINDOW *win, int line, int col)
180{
181	int oldline, oldcol;
182	int c;
183
184	getyx(win, oldline, oldcol);
185	wmove(win, line, col);
186	c = winch(win);
187	wmove(win, oldline, oldcol);
188	return (c);
189}
190