Initial import from FreeBSD RELENG_4:
[dragonfly.git] / usr.bin / talk / display.c
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 #ifndef lint
35 #if 0
36 static char sccsid[] = "@(#)display.c   8.1 (Berkeley) 6/6/93";
37 #endif
38 static const char rcsid[] =
39   "$FreeBSD: src/usr.bin/talk/display.c,v 1.7 1999/08/28 01:06:11 peter Exp $";
40 #endif /* not lint */
41
42 /*
43  * The window 'manager', initializes curses and handles the actual
44  * displaying of text
45  */
46 #include "talk.h"
47 #include <ctype.h>
48
49 xwin_t  my_win;
50 xwin_t  his_win;
51 WINDOW  *line_win;
52
53 int     curses_initialized = 0;
54
55 /*
56  * max HAS to be a function, it is called with
57  * a argument of the form --foo at least once.
58  */
59 int
60 max(a,b)
61         int a, 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  */
71 void
72 display(win, text, size)
73         register xwin_t *win;
74         register char *text;
75         int size;
76 {
77         register int i;
78         char cch;
79
80         for (i = 0; i < size; i++) {
81                 if (*text == '\n' || *text == '\r') {
82                         waddch(win->x_win, '\n');
83                         getyx(win->x_win, win->x_line, win->x_col);
84                         text++;
85                         continue;
86                 }
87                 /* erase character */
88                 if (   *text == win->cerase
89                     || *text == 010     /* BS */
90                     || *text == 0177    /* DEL */
91                    ) {
92                         wmove(win->x_win, win->x_line, max(--win->x_col, 0));
93                         getyx(win->x_win, win->x_line, win->x_col);
94                         waddch(win->x_win, ' ');
95                         wmove(win->x_win, win->x_line, win->x_col);
96                         getyx(win->x_win, win->x_line, win->x_col);
97                         text++;
98                         continue;
99                 }
100                 /*
101                  * On word erase search backwards until we find
102                  * the beginning of a word or the beginning of
103                  * the line.
104                  */
105                 if (   *text == win->werase
106                     || *text == 027     /* ^W */
107                    ) {
108                         int endcol, xcol, i, c;
109
110                         endcol = win->x_col;
111                         xcol = endcol - 1;
112                         while (xcol >= 0) {
113                                 c = readwin(win->x_win, win->x_line, xcol);
114                                 if (c != ' ')
115                                         break;
116                                 xcol--;
117                         }
118                         while (xcol >= 0) {
119                                 c = readwin(win->x_win, win->x_line, xcol);
120                                 if (c == ' ')
121                                         break;
122                                 xcol--;
123                         }
124                         wmove(win->x_win, win->x_line, xcol + 1);
125                         for (i = xcol + 1; i < endcol; i++)
126                                 waddch(win->x_win, ' ');
127                         wmove(win->x_win, win->x_line, xcol + 1);
128                         getyx(win->x_win, win->x_line, win->x_col);
129                         text++;
130                         continue;
131                 }
132                 /* line kill */
133                 if (   *text == win->kill
134                     || *text == 025     /* ^U */
135                    ) {
136                         wmove(win->x_win, win->x_line, 0);
137                         wclrtoeol(win->x_win);
138                         getyx(win->x_win, win->x_line, win->x_col);
139                         text++;
140                         continue;
141                 }
142                 if (*text == '\f') {
143                         if (win == &my_win)
144                                 wrefresh(curscr);
145                         text++;
146                         continue;
147                 }
148                 if (*text == '\7') {
149                         write(STDOUT_FILENO, text, 1);
150                         text++;
151                         continue;
152                 }
153                 if (!isprint((unsigned char)*text) && *text != '\t') {
154                         waddch(win->x_win, '^');
155                         getyx(win->x_win, win->x_line, win->x_col);
156                         cch = (*text & 63) + 64;
157                         waddch(win->x_win, cch);
158                 } else
159                         waddch(win->x_win, (unsigned char)*text);
160                 getyx(win->x_win, win->x_line, win->x_col);
161                 text++;
162         }
163         wrefresh(win->x_win);
164 }
165
166 /*
167  * Read the character at the indicated position in win
168  */
169 int
170 readwin(win, line, col)
171         WINDOW *win;
172         int line;
173         int col;
174 {
175         int oldline, oldcol;
176         register int c;
177
178         getyx(win, oldline, oldcol);
179         wmove(win, line, col);
180         c = winch(win);
181         wmove(win, oldline, oldcol);
182         return (c);
183 }