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
46 void display(xwin_t *, wchar_t *);
47
48 xwin_t my_win;
49 xwin_t his_win;
50 WINDOW *line_win;
51
52 int 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 */
58 int
max(int a,int b)59 max(int a, int b)
60 {
61
62 return (a > b ? a : b);
63 }
64
65 static cchar_t *
makecchar(wchar_t in)66 makecchar(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 */
84 void
display(xwin_t * win,wchar_t * wc)85 display(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 */
122 cerase:
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 */
132 werase:
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 */
165 kill:
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 */
195 int
readwin(WINDOW * win,int line,int col)196 readwin(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