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 * 4. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#include <sys/cdefs.h>
31
32__FBSDID("$FreeBSD$");
33
34#ifndef lint
35static const char sccsid[] = "@(#)display.c	8.1 (Berkeley) 6/6/93";
36#endif
37
38/*
39 * The window 'manager', initializes curses and handles the actual
40 * displaying of text
41 */
42#include <ctype.h>
43#include <unistd.h>
44#include <wctype.h>
45#define _XOPEN_SOURCE_EXTENDED
46#include <curses.h>
47
48#include "talk.h"
49
50void	display(xwin_t *, wchar_t *);
51
52xwin_t	my_win;
53xwin_t	his_win;
54WINDOW	*line_win;
55
56int	curses_initialized = 0;
57
58/*
59 * max HAS to be a function, it is called with
60 * an argument of the form --foo at least once.
61 */
62int
63max(int a, int b)
64{
65
66	return (a > b ? a : b);
67}
68
69static cchar_t *
70makecchar(wchar_t in)
71{
72	static cchar_t cc;
73	wchar_t wc[2];
74
75	wc[0] = in;
76	wc[1] = L'\0';
77
78	if (setcchar(&cc, wc, A_NORMAL, 0, NULL) != OK)
79		p_error("settchar(3) failure");
80
81	return (&cc);
82}
83
84/*
85 * Display a symbol on somebody's window, processing some control
86 * characters while we are at it.
87 */
88void
89display(xwin_t *win, wchar_t *wc)
90{
91
92	/*
93	 * Alas, can't use variables in C switch statement.
94	 * Workaround these 3 cases with goto.
95	 */
96	if (*wc == win->kill)
97		goto kill;
98	else if (*wc == win->cerase)
99		goto cerase;
100	else if (*wc == win->werase)
101		goto werase;
102
103	switch (*wc) {
104	case L'\n':
105	case L'\r':
106		wadd_wch(win->x_win, makecchar(L'\n'));
107		getyx(win->x_win, win->x_line, win->x_col);
108		wrefresh(win->x_win);
109		return;
110
111	case 004:
112		if (win == &my_win) {
113			/* Ctrl-D clears the screen. */
114			werase(my_win.x_win);
115			getyx(my_win.x_win, my_win.x_line, my_win.x_col);
116			wrefresh(my_win.x_win);
117			werase(his_win.x_win);
118			getyx(his_win.x_win, his_win.x_line, his_win.x_col);
119			wrefresh(his_win.x_win);
120		}
121		return;
122
123	/* Erase character. */
124	case 010:	/* BS */
125	case 0177:	/* DEL */
126cerase:
127		wmove(win->x_win, win->x_line, max(--win->x_col, 0));
128		getyx(win->x_win, win->x_line, win->x_col);
129		waddch(win->x_win, ' ');
130		wmove(win->x_win, win->x_line, win->x_col);
131		getyx(win->x_win, win->x_line, win->x_col);
132		wrefresh(win->x_win);
133		return;
134
135	case 027:	/* ^W */
136werase:
137	    {
138		/*
139		 * On word erase search backwards until we find
140		 * the beginning of a word or the beginning of
141		 * the line.
142		 */
143		int endcol, xcol, c;
144
145		endcol = win->x_col;
146		xcol = endcol - 1;
147		while (xcol >= 0) {
148			c = readwin(win->x_win, win->x_line, xcol);
149			if (c != ' ')
150				break;
151			xcol--;
152		}
153		while (xcol >= 0) {
154			c = readwin(win->x_win, win->x_line, xcol);
155			if (c == ' ')
156				break;
157			xcol--;
158		}
159		wmove(win->x_win, win->x_line, xcol + 1);
160		for (int i = xcol + 1; i < endcol; i++)
161			waddch(win->x_win, ' ');
162		wmove(win->x_win, win->x_line, xcol + 1);
163		getyx(win->x_win, win->x_line, win->x_col);
164		wrefresh(win->x_win);
165		return;
166	    }
167
168	case 025:	/* ^U */
169kill:
170		wmove(win->x_win, win->x_line, 0);
171		wclrtoeol(win->x_win);
172		getyx(win->x_win, win->x_line, win->x_col);
173		wrefresh(win->x_win);
174		return;
175
176	case L'\f':
177		if (win == &my_win)
178			wrefresh(curscr);
179		return;
180
181	case L'\7':
182		write(STDOUT_FILENO, wc, sizeof(*wc));
183		return;
184	}
185
186
187	if (iswprint(*wc) || *wc == L'\t')
188		wadd_wch(win->x_win, makecchar(*wc));
189	else
190		beep();
191
192	getyx(win->x_win, win->x_line, win->x_col);
193	wrefresh(win->x_win);
194}
195
196/*
197 * Read the character at the indicated position in win
198 */
199int
200readwin(WINDOW *win, int line, int col)
201{
202	int oldline, oldcol;
203	int c;
204
205	getyx(win, oldline, oldcol);
206	wmove(win, line, col);
207	c = winch(win);
208	wmove(win, oldline, oldcol);
209	return (c);
210}
211