Annotation of src/usr.bin/talk/display.c, Revision 1.11
1.11 ! form 1: /* $OpenBSD$ */
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
1.10 form 41: static char rcsid[] = "$OpenBSD: display.c,v 1.9 2001/11/19 19:02:16 mpech 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;
1.8 hugh 56: int high_print = 0;
1.1 deraadt 57:
58: /*
59: * max HAS to be a function, it is called with
60: * a argument of the form --foo at least once.
61: */
1.5 pjanzen 62: int
1.1 deraadt 63: max(a,b)
64: int a, b;
65: {
66:
67: return (a > b ? a : b);
68: }
69:
70: /*
71: * Display some text on somebody's window, processing some control
72: * characters while we are at it.
73: */
1.5 pjanzen 74: void
1.1 deraadt 75: display(win, text, size)
1.9 mpech 76: xwin_t *win;
77: char *text;
1.1 deraadt 78: int size;
79: {
1.9 mpech 80: int i;
1.1 deraadt 81: char cch;
82:
83: for (i = 0; i < size; i++) {
1.6 millert 84: /*
85: * Since we do not use curses's input routines we must
86: * convert '\r' -> '\n' ourselves.
87: */
88: if (*text == '\r')
89: *text = '\n';
90: if (*text == '\n') {
1.1 deraadt 91: xscroll(win, 0);
92: text++;
93: continue;
94: }
95: /* erase character */
96: if (*text == win->cerase) {
97: wmove(win->x_win, win->x_line, max(--win->x_col, 0));
98: getyx(win->x_win, win->x_line, win->x_col);
99: waddch(win->x_win, ' ');
100: wmove(win->x_win, win->x_line, win->x_col);
101: getyx(win->x_win, win->x_line, win->x_col);
102: text++;
103: continue;
104: }
105: /*
106: * On word erase search backwards until we find
107: * the beginning of a word or the beginning of
108: * the line.
109: */
110: if (*text == win->werase) {
111: int endcol, xcol, i, c;
112:
113: endcol = win->x_col;
114: xcol = endcol - 1;
115: while (xcol >= 0) {
116: c = readwin(win->x_win, win->x_line, xcol);
117: if (c != ' ')
118: break;
119: xcol--;
120: }
121: while (xcol >= 0) {
122: c = readwin(win->x_win, win->x_line, xcol);
123: if (c == ' ')
124: break;
125: xcol--;
126: }
127: wmove(win->x_win, win->x_line, xcol + 1);
128: for (i = xcol + 1; i < endcol; i++)
129: waddch(win->x_win, ' ');
130: wmove(win->x_win, win->x_line, xcol + 1);
131: getyx(win->x_win, win->x_line, win->x_col);
132: text++;
133: continue;
134: }
135: /* line kill */
136: if (*text == win->kill) {
137: wmove(win->x_win, win->x_line, 0);
138: wclrtoeol(win->x_win);
139: getyx(win->x_win, win->x_line, win->x_col);
140: text++;
141: continue;
142: }
143: if (*text == '\f') {
144: if (win == &my_win)
145: wrefresh(curscr);
146: text++;
147: continue;
148: }
149: if (win->x_col == COLS-1) {
150: /* check for wraparound */
151: xscroll(win, 0);
152: }
1.8 hugh 153: if (*text != '\t' &&
154: ((!high_print && !isprint(*text)) || iscntrl(*text))) {
1.1 deraadt 155: waddch(win->x_win, '^');
156: getyx(win->x_win, win->x_line, win->x_col);
157: if (win->x_col == COLS-1) /* check for wraparound */
158: xscroll(win, 0);
159: cch = (*text & 63) + 64;
160: waddch(win->x_win, cch);
161: } else
1.7 angelos 162: waddch(win->x_win, (unsigned char)(*text));
1.1 deraadt 163: getyx(win->x_win, win->x_line, win->x_col);
164: text++;
165: }
166: wrefresh(win->x_win);
167: }
168:
169: /*
170: * Read the character at the indicated position in win
171: */
1.5 pjanzen 172: int
1.1 deraadt 173: readwin(win, line, col)
174: WINDOW *win;
1.5 pjanzen 175: int line, col;
1.1 deraadt 176: {
177: int oldline, oldcol;
1.9 mpech 178: int c;
1.1 deraadt 179:
180: getyx(win, oldline, oldcol);
181: wmove(win, line, col);
182: c = winch(win);
183: wmove(win, oldline, oldcol);
184: return (c);
185: }
186:
187: /*
188: * Scroll a window, blanking out the line following the current line
189: * so that the current position is obvious
190: */
1.5 pjanzen 191: void
1.1 deraadt 192: xscroll(win, flag)
1.9 mpech 193: xwin_t *win;
1.1 deraadt 194: int flag;
195: {
196:
197: if (flag == -1) {
198: wmove(win->x_win, 0, 0);
199: win->x_line = 0;
200: win->x_col = 0;
201: return;
202: }
1.11 ! form 203: win->x_line = (win->x_line + 1) % win->x_nlines;
1.1 deraadt 204: win->x_col = 0;
1.11 ! form 205: wmove(win->x_win, win->x_line, win->x_col);
! 206: wclrtoeol(win->x_win);
! 207: wmove(win->x_win, (win->x_line + 1) % win->x_nlines, win->x_col);
! 208: wclrtoeol(win->x_win);
1.1 deraadt 209: wmove(win->x_win, win->x_line, win->x_col);
210: }
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