Add the DragonFly cvs id and perform general cleanups on cvs/rcs/sccs ids. Most
[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  * @(#)display.c        8.1 (Berkeley) 6/6/93
34  * $FreeBSD: src/usr.bin/talk/display.c,v 1.7 1999/08/28 01:06:11 peter Exp $
35  * $DragonFly: src/usr.bin/talk/display.c,v 1.2 2003/06/17 04:29:32 dillon Exp $
36  */
37
38 /*
39  * The window 'manager', initializes curses and handles the actual
40  * displaying of text
41  */
42 #include "talk.h"
43 #include <ctype.h>
44
45 xwin_t  my_win;
46 xwin_t  his_win;
47 WINDOW  *line_win;
48
49 int     curses_initialized = 0;
50
51 /*
52  * max HAS to be a function, it is called with
53  * a argument of the form --foo at least once.
54  */
55 int
56 max(a,b)
57         int a, b;
58 {
59
60         return (a > b ? a : b);
61 }
62
63 /*
64  * Display some text on somebody's window, processing some control
65  * characters while we are at it.
66  */
67 void
68 display(win, text, size)
69         register xwin_t *win;
70         register char *text;
71         int size;
72 {
73         register int i;
74         char cch;
75
76         for (i = 0; i < size; i++) {
77                 if (*text == '\n' || *text == '\r') {
78                         waddch(win->x_win, '\n');
79                         getyx(win->x_win, win->x_line, win->x_col);
80                         text++;
81                         continue;
82                 }
83                 /* erase character */
84                 if (   *text == win->cerase
85                     || *text == 010     /* BS */
86                     || *text == 0177    /* DEL */
87                    ) {
88                         wmove(win->x_win, win->x_line, max(--win->x_col, 0));
89                         getyx(win->x_win, win->x_line, win->x_col);
90                         waddch(win->x_win, ' ');
91                         wmove(win->x_win, win->x_line, win->x_col);
92                         getyx(win->x_win, win->x_line, win->x_col);
93                         text++;
94                         continue;
95                 }
96                 /*
97                  * On word erase search backwards until we find
98                  * the beginning of a word or the beginning of
99                  * the line.
100                  */
101                 if (   *text == win->werase
102                     || *text == 027     /* ^W */
103                    ) {
104                         int endcol, xcol, i, c;
105
106                         endcol = win->x_col;
107                         xcol = endcol - 1;
108                         while (xcol >= 0) {
109                                 c = readwin(win->x_win, win->x_line, xcol);
110                                 if (c != ' ')
111                                         break;
112                                 xcol--;
113                         }
114                         while (xcol >= 0) {
115                                 c = readwin(win->x_win, win->x_line, xcol);
116                                 if (c == ' ')
117                                         break;
118                                 xcol--;
119                         }
120                         wmove(win->x_win, win->x_line, xcol + 1);
121                         for (i = xcol + 1; i < endcol; i++)
122                                 waddch(win->x_win, ' ');
123                         wmove(win->x_win, win->x_line, xcol + 1);
124                         getyx(win->x_win, win->x_line, win->x_col);
125                         text++;
126                         continue;
127                 }
128                 /* line kill */
129                 if (   *text == win->kill
130                     || *text == 025     /* ^U */
131                    ) {
132                         wmove(win->x_win, win->x_line, 0);
133                         wclrtoeol(win->x_win);
134                         getyx(win->x_win, win->x_line, win->x_col);
135                         text++;
136                         continue;
137                 }
138                 if (*text == '\f') {
139                         if (win == &my_win)
140                                 wrefresh(curscr);
141                         text++;
142                         continue;
143                 }
144                 if (*text == '\7') {
145                         write(STDOUT_FILENO, text, 1);
146                         text++;
147                         continue;
148                 }
149                 if (!isprint((unsigned char)*text) && *text != '\t') {
150                         waddch(win->x_win, '^');
151                         getyx(win->x_win, win->x_line, win->x_col);
152                         cch = (*text & 63) + 64;
153                         waddch(win->x_win, cch);
154                 } else
155                         waddch(win->x_win, (unsigned char)*text);
156                 getyx(win->x_win, win->x_line, win->x_col);
157                 text++;
158         }
159         wrefresh(win->x_win);
160 }
161
162 /*
163  * Read the character at the indicated position in win
164  */
165 int
166 readwin(win, line, col)
167         WINDOW *win;
168         int line;
169         int col;
170 {
171         int oldline, oldcol;
172         register int c;
173
174         getyx(win, oldline, oldcol);
175         wmove(win, line, col);
176         c = winch(win);
177         wmove(win, oldline, oldcol);
178         return (c);
179 }