Annotation of src/usr.bin/talk/display.c, Revision 1.4
1.3 deraadt 1: /* $OpenBSD: display.c,v 1.2 1996/06/26 05:40:21 deraadt Exp $ */
1.1 deraadt 2: /* $NetBSD: display.c,v 1.3 1994/12/09 02:14:13 jtc Exp $ */
3:
4: /*
5: * Copyright (c) 1983, 1993
6: * The Regents of the University of California. All rights reserved.
7: *
8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following conditions
10: * are met:
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in the
15: * documentation and/or other materials provided with the distribution.
16: * 3. All advertising materials mentioning features or use of this software
17: * must display the following acknowledgement:
18: * This product includes software developed by the University of
19: * California, Berkeley and its contributors.
20: * 4. Neither the name of the University nor the names of its contributors
21: * may be used to endorse or promote products derived from this software
22: * without specific prior written permission.
23: *
24: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34: * SUCH DAMAGE.
35: */
36:
37: #ifndef lint
38: #if 0
39: static char sccsid[] = "@(#)display.c 8.1 (Berkeley) 6/6/93";
40: #endif
1.3 deraadt 41: static char rcsid[] = "$OpenBSD: display.c,v 1.2 1996/06/26 05:40:21 deraadt Exp $";
1.1 deraadt 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"
1.3 deraadt 49: #include <ctype.h>
1.1 deraadt 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: max(a,b)
62: int a, b;
63: {
64:
65: return (a > b ? a : b);
66: }
67:
68: /*
69: * Display some text on somebody's window, processing some control
70: * characters while we are at it.
71: */
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++) {
1.4 ! deraadt 81: if (*text == '\n' || *text == '\r') {
1.1 deraadt 82: xscroll(win, 0);
83: text++;
84: continue;
85: }
86: /* erase character */
87: if (*text == win->cerase) {
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: int endcol, xcol, i, c;
103:
104: endcol = win->x_col;
105: xcol = endcol - 1;
106: while (xcol >= 0) {
107: c = readwin(win->x_win, win->x_line, xcol);
108: if (c != ' ')
109: break;
110: xcol--;
111: }
112: while (xcol >= 0) {
113: c = readwin(win->x_win, win->x_line, xcol);
114: if (c == ' ')
115: break;
116: xcol--;
117: }
118: wmove(win->x_win, win->x_line, xcol + 1);
119: for (i = xcol + 1; i < endcol; i++)
120: waddch(win->x_win, ' ');
121: wmove(win->x_win, win->x_line, xcol + 1);
122: getyx(win->x_win, win->x_line, win->x_col);
123: text++;
124: continue;
125: }
126: /* line kill */
127: if (*text == win->kill) {
128: wmove(win->x_win, win->x_line, 0);
129: wclrtoeol(win->x_win);
130: getyx(win->x_win, win->x_line, win->x_col);
131: text++;
132: continue;
133: }
134: if (*text == '\f') {
135: if (win == &my_win)
136: wrefresh(curscr);
137: text++;
138: continue;
139: }
140: if (win->x_col == COLS-1) {
141: /* check for wraparound */
142: xscroll(win, 0);
143: }
1.3 deraadt 144: if (!isprint(*text) && *text != '\t') {
1.1 deraadt 145: waddch(win->x_win, '^');
146: getyx(win->x_win, win->x_line, win->x_col);
147: if (win->x_col == COLS-1) /* check for wraparound */
148: xscroll(win, 0);
149: cch = (*text & 63) + 64;
150: waddch(win->x_win, cch);
151: } else
152: waddch(win->x_win, *text);
153: getyx(win->x_win, win->x_line, win->x_col);
154: text++;
155: }
156: wrefresh(win->x_win);
157: }
158:
159: /*
160: * Read the character at the indicated position in win
161: */
162: readwin(win, line, col)
163: WINDOW *win;
164: {
165: int oldline, oldcol;
166: register int c;
167:
168: getyx(win, oldline, oldcol);
169: wmove(win, line, col);
170: c = winch(win);
171: wmove(win, oldline, oldcol);
172: return (c);
173: }
174:
175: /*
176: * Scroll a window, blanking out the line following the current line
177: * so that the current position is obvious
178: */
179: xscroll(win, flag)
180: register xwin_t *win;
181: int flag;
182: {
183:
184: if (flag == -1) {
185: wmove(win->x_win, 0, 0);
186: win->x_line = 0;
187: win->x_col = 0;
188: return;
189: }
190: win->x_line = (win->x_line + 1) % win->x_nlines;
191: win->x_col = 0;
192: wmove(win->x_win, win->x_line, win->x_col);
193: wclrtoeol(win->x_win);
194: wmove(win->x_win, (win->x_line + 1) % win->x_nlines, win->x_col);
195: wclrtoeol(win->x_win);
196: wmove(win->x_win, win->x_line, win->x_col);
197: }
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