display.c revision 1.6 1 /* $NetBSD: display.c,v 1.6 1999/08/13 13:52:59 proff Exp $ */
2
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. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
17 * This product includes software developed by the University of
18 * California, Berkeley and its contributors.
19 * 4. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36 #include <sys/cdefs.h>
37 #ifndef lint
38 #if 0
39 static char sccsid[] = "@(#)display.c 8.1 (Berkeley) 6/6/93";
40 #endif
41 __RCSID("$NetBSD: display.c,v 1.6 1999/08/13 13:52:59 proff Exp $");
42 #endif /* not lint */
43
44 /*
45 * The window 'manager', initializes curses and handles the actual
46 * displaying of text
47 */
48 #include "talk.h"
49 #include <ctype.h>
50
51 xwin_t my_win;
52 xwin_t his_win;
53 WINDOW *line_win;
54
55 int curses_initialized = 0;
56
57 /*
58 * max HAS to be a function, it is called with
59 * a argument of the form --foo at least once.
60 */
61 int
62 max(a,b)
63 int a, b;
64 {
65
66 return (a > b ? a : b);
67 }
68
69 /*
70 * Display some text on somebody's window, processing some control
71 * characters while we are at it.
72 */
73 void
74 display(win, text, size)
75 xwin_t *win;
76 char *text;
77 int size;
78 {
79 int i;
80 char cch;
81
82 for (i = 0; i < size; i++) {
83 if (*text == '\n') {
84 xscroll(win, 0);
85 text++;
86 continue;
87 }
88 /* erase character */
89 if (*text == win->cerase) {
90 wmove(win->x_win, win->x_line, max(--win->x_col, 0));
91 getyx(win->x_win, win->x_line, win->x_col);
92 waddch(win->x_win, ' ');
93 wmove(win->x_win, win->x_line, win->x_col);
94 getyx(win->x_win, win->x_line, win->x_col);
95 text++;
96 continue;
97 }
98 /*
99 * On word erase search backwards until we find
100 * the beginning of a word or the beginning of
101 * the line.
102 */
103 if (*text == win->werase) {
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 wmove(win->x_win, win->x_line, 0);
131 wclrtoeol(win->x_win);
132 getyx(win->x_win, win->x_line, win->x_col);
133 text++;
134 continue;
135 }
136 if (*text == '\f') {
137 if (win == &my_win)
138 wrefresh(curscr);
139 text++;
140 continue;
141 }
142 if (*text == '\07') {
143 beep();
144 text++;
145 continue;
146 }
147 if (win->x_col == COLS-1) {
148 /* check for wraparound */
149 xscroll(win, 0);
150 }
151 if ( !isprint((u_char)*text) && *text != '\t') {
152 waddch(win->x_win, '^');
153 getyx(win->x_win, win->x_line, win->x_col);
154 if (win->x_col == COLS-1) /* check for wraparound */
155 xscroll(win, 0);
156 cch = (*text & 63) + 64;
157 waddch(win->x_win, cch);
158 } else
159 waddch(win->x_win, *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, col;
173 {
174 int oldline, oldcol;
175 int c;
176
177 getyx(win, oldline, oldcol);
178 wmove(win, line, col);
179 c = winch(win);
180 wmove(win, oldline, oldcol);
181 return (c);
182 }
183
184 /*
185 * Scroll a window, blanking out the line following the current line
186 * so that the current position is obvious
187 */
188 void
189 xscroll(win, flag)
190 xwin_t *win;
191 int flag;
192 {
193
194 if (flag == -1) {
195 wmove(win->x_win, 0, 0);
196 win->x_line = 0;
197 win->x_col = 0;
198 return;
199 }
200 win->x_line = (win->x_line + 1) % win->x_nlines;
201 win->x_col = 0;
202 wmove(win->x_win, win->x_line, win->x_col);
203 wclrtoeol(win->x_win);
204 wmove(win->x_win, (win->x_line + 1) % win->x_nlines, win->x_col);
205 wclrtoeol(win->x_win);
206 wmove(win->x_win, win->x_line, win->x_col);
207 }
208