1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1983, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32
33
34/*
35 * The window 'manager', initializes curses and handles the actual
36 * displaying of text
37 */
38#include <ctype.h>
39#include <unistd.h>
40#include <wctype.h>
41#define _XOPEN_SOURCE_EXTENDED
42#include <curses.h>
43
44#include "talk.h"
45
46void	display(xwin_t *, wchar_t *);
47
48xwin_t	my_win;
49xwin_t	his_win;
50WINDOW	*line_win;
51
52int	curses_initialized = 0;
53
54/*
55 * max HAS to be a function, it is called with
56 * an argument of the form --foo at least once.
57 */
58int
59max(int a, int b)
60{
61
62	return (a > b ? a : b);
63}
64
65static cchar_t *
66makecchar(wchar_t in)
67{
68	static cchar_t cc;
69	wchar_t wc[2];
70
71	wc[0] = in;
72	wc[1] = L'\0';
73
74	if (setcchar(&cc, wc, A_NORMAL, 0, NULL) != OK)
75		p_error("settchar(3) failure");
76
77	return (&cc);
78}
79
80/*
81 * Display a symbol on somebody's window, processing some control
82 * characters while we are at it.
83 */
84void
85display(xwin_t *win, wchar_t *wc)
86{
87
88	/*
89	 * Alas, can't use variables in C switch statement.
90	 * Workaround these 3 cases with goto.
91	 */
92	if (*wc == win->kill)
93		goto kill;
94	else if (*wc == win->cerase)
95		goto cerase;
96	else if (*wc == win->werase)
97		goto werase;
98
99	switch (*wc) {
100	case L'\n':
101	case L'\r':
102		wadd_wch(win->x_win, makecchar(L'\n'));
103		getyx(win->x_win, win->x_line, win->x_col);
104		wrefresh(win->x_win);
105		return;
106
107	case 004:
108		if (win == &my_win) {
109			/* Ctrl-D clears the screen. */
110			werase(my_win.x_win);
111			getyx(my_win.x_win, my_win.x_line, my_win.x_col);
112			wrefresh(my_win.x_win);
113			werase(his_win.x_win);
114			getyx(his_win.x_win, his_win.x_line, his_win.x_col);
115			wrefresh(his_win.x_win);
116		}
117		return;
118
119	/* Erase character. */
120	case 010:	/* BS */
121	case 0177:	/* DEL */
122cerase:
123		wmove(win->x_win, win->x_line, max(--win->x_col, 0));
124		getyx(win->x_win, win->x_line, win->x_col);
125		waddch(win->x_win, ' ');
126		wmove(win->x_win, win->x_line, win->x_col);
127		getyx(win->x_win, win->x_line, win->x_col);
128		wrefresh(win->x_win);
129		return;
130
131	case 027:	/* ^W */
132werase:
133	    {
134		/*
135		 * On word erase search backwards until we find
136		 * the beginning of a word or the beginning of
137		 * the line.
138		 */
139		int endcol, xcol, c;
140
141		endcol = win->x_col;
142		xcol = endcol - 1;
143		while (xcol >= 0) {
144			c = readwin(win->x_win, win->x_line, xcol);
145			if (c != ' ')
146				break;
147			xcol--;
148		}
149		while (xcol >= 0) {
150			c = readwin(win->x_win, win->x_line, xcol);
151			if (c == ' ')
152				break;
153			xcol--;
154		}
155		wmove(win->x_win, win->x_line, xcol + 1);
156		for (int i = xcol + 1; i < endcol; i++)
157			waddch(win->x_win, ' ');
158		wmove(win->x_win, win->x_line, xcol + 1);
159		getyx(win->x_win, win->x_line, win->x_col);
160		wrefresh(win->x_win);
161		return;
162	    }
163
164	case 025:	/* ^U */
165kill:
166		wmove(win->x_win, win->x_line, 0);
167		wclrtoeol(win->x_win);
168		getyx(win->x_win, win->x_line, win->x_col);
169		wrefresh(win->x_win);
170		return;
171
172	case L'\f':
173		if (win == &my_win)
174			wrefresh(curscr);
175		return;
176
177	case L'\7':
178		write(STDOUT_FILENO, wc, sizeof(*wc));
179		return;
180	}
181
182
183	if (iswprint(*wc) || *wc == L'\t')
184		wadd_wch(win->x_win, makecchar(*wc));
185	else
186		beep();
187
188	getyx(win->x_win, win->x_line, win->x_col);
189	wrefresh(win->x_win);
190}
191
192/*
193 * Read the character at the indicated position in win
194 */
195int
196readwin(WINDOW *win, int line, int col)
197{
198	int oldline, oldcol;
199	int c;
200
201	getyx(win, oldline, oldcol);
202	wmove(win, line, col);
203	c = winch(win);
204	wmove(win, oldline, oldcol);
205	return (c);
206}
207