Annotation of src/usr.bin/talk/display.c, Revision 1.14
1.14 ! tedu 1: /* $OpenBSD: display.c,v 1.13 2003/06/03 02:56:17 millert 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.
1.13 millert 16: * 3. Neither the name of the University nor the names of its contributors
1.1 deraadt 17: * may be used to endorse or promote products derived from this software
18: * without specific prior written permission.
19: *
20: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30: * SUCH DAMAGE.
31: */
32:
33: #ifndef lint
34: #if 0
35: static char sccsid[] = "@(#)display.c 8.1 (Berkeley) 6/6/93";
36: #endif
1.14 ! tedu 37: static const char rcsid[] = "$OpenBSD: display.c,v 1.13 2003/06/03 02:56:17 millert Exp $";
1.1 deraadt 38: #endif /* not lint */
39:
40: /*
41: * The window 'manager', initializes curses and handles the actual
42: * displaying of text
43: */
44: #include "talk.h"
1.3 deraadt 45: #include <ctype.h>
1.1 deraadt 46:
47: xwin_t my_win;
48: xwin_t his_win;
49: WINDOW *line_win;
50:
51: int curses_initialized = 0;
1.8 hugh 52: int high_print = 0;
1.12 millert 53: bool smooth_scroll = FALSE;
1.1 deraadt 54:
55: /*
56: * max HAS to be a function, it is called with
57: * a argument of the form --foo at least once.
58: */
1.5 pjanzen 59: int
1.1 deraadt 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: */
1.5 pjanzen 71: void
1.1 deraadt 72: display(win, text, size)
1.9 mpech 73: xwin_t *win;
74: char *text;
1.1 deraadt 75: int size;
76: {
1.9 mpech 77: int i;
1.1 deraadt 78: char cch;
79:
80: for (i = 0; i < size; i++) {
1.6 millert 81: /*
82: * Since we do not use curses's input routines we must
83: * convert '\r' -> '\n' ourselves.
84: */
85: if (*text == '\r')
86: *text = '\n';
87: if (*text == '\n') {
1.1 deraadt 88: xscroll(win, 0);
89: text++;
90: continue;
91: }
92: /* erase character */
93: if (*text == win->cerase) {
94: wmove(win->x_win, win->x_line, max(--win->x_col, 0));
95: getyx(win->x_win, win->x_line, win->x_col);
96: waddch(win->x_win, ' ');
97: wmove(win->x_win, win->x_line, win->x_col);
98: getyx(win->x_win, win->x_line, win->x_col);
99: text++;
100: continue;
101: }
102: /*
103: * On word erase search backwards until we find
104: * the beginning of a word or the beginning of
105: * the line.
106: */
107: if (*text == win->werase) {
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: wmove(win->x_win, win->x_line, 0);
135: wclrtoeol(win->x_win);
136: getyx(win->x_win, win->x_line, win->x_col);
137: text++;
138: continue;
139: }
140: if (*text == '\f') {
141: if (win == &my_win)
142: wrefresh(curscr);
143: text++;
144: continue;
145: }
146: if (win->x_col == COLS-1) {
147: /* check for wraparound */
148: xscroll(win, 0);
149: }
1.8 hugh 150: if (*text != '\t' &&
151: ((!high_print && !isprint(*text)) || iscntrl(*text))) {
1.1 deraadt 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
1.7 angelos 159: waddch(win->x_win, (unsigned char)(*text));
1.1 deraadt 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: */
1.5 pjanzen 169: int
1.1 deraadt 170: readwin(win, line, col)
171: WINDOW *win;
1.5 pjanzen 172: int line, col;
1.1 deraadt 173: {
174: int oldline, oldcol;
1.9 mpech 175: int c;
1.1 deraadt 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: */
1.5 pjanzen 188: void
1.1 deraadt 189: xscroll(win, flag)
1.9 mpech 190: xwin_t *win;
1.1 deraadt 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_col = 0;
1.12 millert 201: if (smooth_scroll) {
202: if (++win->x_line == win->x_nlines) {
203: --win->x_line;
204: scroll(win->x_win);
205: }
206: } else {
207: win->x_line = (win->x_line + 1) % win->x_nlines;
208: wmove(win->x_win, win->x_line, win->x_col);
209: wclrtoeol(win->x_win);
210: wmove(win->x_win, (win->x_line + 1) % win->x_nlines,
211: win->x_col);
212: wclrtoeol(win->x_win);
213: }
1.1 deraadt 214: wmove(win->x_win, win->x_line, win->x_col);
215: }
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