display.c revision 99965 
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 99965 2002-07-14 14:08:43Z luigi $");
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 * a argument of the form --foo at least once.
59 */
60int
61max(a,b)
62	int a, b;
63{
64
65	return (a > b ? a : b);
66}
67
68/*
69 * Display some text on somebody's window, processing some control
70 * characters while we are at it.
71 */
72void
73display(win, text, size)
74	xwin_t *win;
75	char *text;
76	int size;
77{
78	int i;
79	char cch;
80
81	for (i = 0; i < size; i++) {
82		if (*text == '\n' || *text == '\r') {
83			waddch(win->x_win, '\n');
84			getyx(win->x_win, win->x_line, win->x_col);
85			text++;
86			continue;
87		}
88		if (*text == 004 && win == &my_win) {
89			/* control-D clears the screen */
90			werase(my_win.x_win);
91			getyx(my_win.x_win, my_win.x_line, my_win.x_col);
92			wrefresh(my_win.x_win);
93			werase(his_win.x_win);
94			getyx(his_win.x_win, his_win.x_line, his_win.x_col);
95			wrefresh(his_win.x_win);
96			text++;
97			continue;
98		}
99
100		/* erase character */
101		if (   *text == win->cerase
102		    || *text == 010     /* BS */
103		    || *text == 0177    /* DEL */
104		   ) {
105			wmove(win->x_win, win->x_line, max(--win->x_col, 0));
106			getyx(win->x_win, win->x_line, win->x_col);
107			waddch(win->x_win, ' ');
108			wmove(win->x_win, win->x_line, win->x_col);
109			getyx(win->x_win, win->x_line, win->x_col);
110			text++;
111			continue;
112		}
113		/*
114		 * On word erase search backwards until we find
115		 * the beginning of a word or the beginning of
116		 * the line.
117		 */
118		if (   *text == win->werase
119		    || *text == 027     /* ^W */
120		   ) {
121			int endcol, xcol, ii, c;
122
123			endcol = win->x_col;
124			xcol = endcol - 1;
125			while (xcol >= 0) {
126				c = readwin(win->x_win, win->x_line, xcol);
127				if (c != ' ')
128					break;
129				xcol--;
130			}
131			while (xcol >= 0) {
132				c = readwin(win->x_win, win->x_line, xcol);
133				if (c == ' ')
134					break;
135				xcol--;
136			}
137			wmove(win->x_win, win->x_line, xcol + 1);
138			for (ii = xcol + 1; ii < endcol; ii++)
139				waddch(win->x_win, ' ');
140			wmove(win->x_win, win->x_line, xcol + 1);
141			getyx(win->x_win, win->x_line, win->x_col);
142			text++;
143			continue;
144		}
145		/* line kill */
146		if (   *text == win->kill
147		    || *text == 025     /* ^U */
148		   ) {
149			wmove(win->x_win, win->x_line, 0);
150			wclrtoeol(win->x_win);
151			getyx(win->x_win, win->x_line, win->x_col);
152			text++;
153			continue;
154		}
155		if (*text == '\f') {
156			if (win == &my_win)
157				wrefresh(curscr);
158			text++;
159			continue;
160		}
161		if (*text == '\7') {
162			write(STDOUT_FILENO, text, 1);
163			text++;
164			continue;
165		}
166		if (!isprint((unsigned char)*text) && *text != '\t') {
167			waddch(win->x_win, '^');
168			getyx(win->x_win, win->x_line, win->x_col);
169			cch = (*text & 63) + 64;
170			waddch(win->x_win, cch);
171		} else
172			waddch(win->x_win, (unsigned char)*text);
173		getyx(win->x_win, win->x_line, win->x_col);
174		text++;
175	}
176	wrefresh(win->x_win);
177}
178
179/*
180 * Read the character at the indicated position in win
181 */
182int
183readwin(win, line, col)
184	WINDOW *win;
185	int line;
186	int col;
187{
188	int oldline, oldcol;
189	int c;
190
191	getyx(win, oldline, oldcol);
192	wmove(win, line, col);
193	c = winch(win);
194	wmove(win, oldline, oldcol);
195	return (c);
196}
197