Annotation of src/usr.bin/talk/display.c, Revision 1.5
1.5 ! pjanzen 1: /* $OpenBSD: display.c,v 1.4 1997/11/30 20:30:50 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
1.5 ! pjanzen 41: static char rcsid[] = "$OpenBSD: display.c,v 1.4 1997/11/30 20:30:50 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: */
1.5 ! pjanzen 61: int
1.1 deraadt 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: */
1.5 ! pjanzen 73: void
1.1 deraadt 74: display(win, text, size)
75: register xwin_t *win;
76: register char *text;
77: int size;
78: {
79: register int i;
80: char cch;
81:
82: for (i = 0; i < size; i++) {
1.4 deraadt 83: if (*text == '\n' || *text == '\r') {
1.1 deraadt 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 (win->x_col == COLS-1) {
143: /* check for wraparound */
144: xscroll(win, 0);
145: }
1.3 deraadt 146: if (!isprint(*text) && *text != '\t') {
1.1 deraadt 147: waddch(win->x_win, '^');
148: getyx(win->x_win, win->x_line, win->x_col);
149: if (win->x_col == COLS-1) /* check for wraparound */
150: xscroll(win, 0);
151: cch = (*text & 63) + 64;
152: waddch(win->x_win, cch);
153: } else
154: waddch(win->x_win, *text);
155: getyx(win->x_win, win->x_line, win->x_col);
156: text++;
157: }
158: wrefresh(win->x_win);
159: }
160:
161: /*
162: * Read the character at the indicated position in win
163: */
1.5 ! pjanzen 164: int
1.1 deraadt 165: readwin(win, line, col)
166: WINDOW *win;
1.5 ! pjanzen 167: int line, col;
1.1 deraadt 168: {
169: int oldline, oldcol;
170: register int c;
171:
172: getyx(win, oldline, oldcol);
173: wmove(win, line, col);
174: c = winch(win);
175: wmove(win, oldline, oldcol);
176: return (c);
177: }
178:
179: /*
180: * Scroll a window, blanking out the line following the current line
181: * so that the current position is obvious
182: */
1.5 ! pjanzen 183: void
1.1 deraadt 184: xscroll(win, flag)
185: register xwin_t *win;
186: int flag;
187: {
188:
189: if (flag == -1) {
190: wmove(win->x_win, 0, 0);
191: win->x_line = 0;
192: win->x_col = 0;
193: return;
194: }
195: win->x_line = (win->x_line + 1) % win->x_nlines;
196: win->x_col = 0;
197: wmove(win->x_win, win->x_line, win->x_col);
198: wclrtoeol(win->x_win);
199: wmove(win->x_win, (win->x_line + 1) % win->x_nlines, win->x_col);
200: wclrtoeol(win->x_win);
201: wmove(win->x_win, win->x_line, win->x_col);
202: }
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