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1.1 deraadt 1: /* $NetBSD: display.c,v 1.3 1994/12/09 02:14:13 jtc 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: #ifndef lint
37: #if 0
38: static char sccsid[] = "@(#)display.c 8.1 (Berkeley) 6/6/93";
39: #endif
40: static char rcsid[] = "$NetBSD: display.c,v 1.3 1994/12/09 02:14:13 jtc Exp $";
41: #endif /* not lint */
42:
43: /*
44: * The window 'manager', initializes curses and handles the actual
45: * displaying of text
46: */
47: #include "talk.h"
48:
49: xwin_t my_win;
50: xwin_t his_win;
51: WINDOW *line_win;
52:
53: int curses_initialized = 0;
54:
55: /*
56: * max HAS to be a function, it is called with
57: * a argument of the form --foo at least once.
58: */
59: max(a,b)
60: int a, b;
61: {
62:
63: return (a > b ? a : b);
64: }
65:
66: /*
67: * Display some text on somebody's window, processing some control
68: * characters while we are at it.
69: */
70: display(win, text, size)
71: register xwin_t *win;
72: register char *text;
73: int size;
74: {
75: register int i;
76: char cch;
77:
78: for (i = 0; i < size; i++) {
79: if (*text == '\n') {
80: xscroll(win, 0);
81: text++;
82: continue;
83: }
84: /* erase character */
85: if (*text == win->cerase) {
86: wmove(win->x_win, win->x_line, max(--win->x_col, 0));
87: getyx(win->x_win, win->x_line, win->x_col);
88: waddch(win->x_win, ' ');
89: wmove(win->x_win, win->x_line, win->x_col);
90: getyx(win->x_win, win->x_line, win->x_col);
91: text++;
92: continue;
93: }
94: /*
95: * On word erase search backwards until we find
96: * the beginning of a word or the beginning of
97: * the line.
98: */
99: if (*text == win->werase) {
100: int endcol, xcol, i, c;
101:
102: endcol = win->x_col;
103: xcol = endcol - 1;
104: while (xcol >= 0) {
105: c = readwin(win->x_win, win->x_line, xcol);
106: if (c != ' ')
107: break;
108: xcol--;
109: }
110: while (xcol >= 0) {
111: c = readwin(win->x_win, win->x_line, xcol);
112: if (c == ' ')
113: break;
114: xcol--;
115: }
116: wmove(win->x_win, win->x_line, xcol + 1);
117: for (i = xcol + 1; i < endcol; i++)
118: waddch(win->x_win, ' ');
119: wmove(win->x_win, win->x_line, xcol + 1);
120: getyx(win->x_win, win->x_line, win->x_col);
121: text++;
122: continue;
123: }
124: /* line kill */
125: if (*text == win->kill) {
126: wmove(win->x_win, win->x_line, 0);
127: wclrtoeol(win->x_win);
128: getyx(win->x_win, win->x_line, win->x_col);
129: text++;
130: continue;
131: }
132: if (*text == '\f') {
133: if (win == &my_win)
134: wrefresh(curscr);
135: text++;
136: continue;
137: }
138: if (win->x_col == COLS-1) {
139: /* check for wraparound */
140: xscroll(win, 0);
141: }
142: if (*text < ' ' && *text != '\t') {
143: waddch(win->x_win, '^');
144: getyx(win->x_win, win->x_line, win->x_col);
145: if (win->x_col == COLS-1) /* check for wraparound */
146: xscroll(win, 0);
147: cch = (*text & 63) + 64;
148: waddch(win->x_win, cch);
149: } else
150: waddch(win->x_win, *text);
151: getyx(win->x_win, win->x_line, win->x_col);
152: text++;
153: }
154: wrefresh(win->x_win);
155: }
156:
157: /*
158: * Read the character at the indicated position in win
159: */
160: readwin(win, line, col)
161: WINDOW *win;
162: {
163: int oldline, oldcol;
164: register int c;
165:
166: getyx(win, oldline, oldcol);
167: wmove(win, line, col);
168: c = winch(win);
169: wmove(win, oldline, oldcol);
170: return (c);
171: }
172:
173: /*
174: * Scroll a window, blanking out the line following the current line
175: * so that the current position is obvious
176: */
177: xscroll(win, flag)
178: register xwin_t *win;
179: int flag;
180: {
181:
182: if (flag == -1) {
183: wmove(win->x_win, 0, 0);
184: win->x_line = 0;
185: win->x_col = 0;
186: return;
187: }
188: win->x_line = (win->x_line + 1) % win->x_nlines;
189: win->x_col = 0;
190: wmove(win->x_win, win->x_line, win->x_col);
191: wclrtoeol(win->x_win);
192: wmove(win->x_win, (win->x_line + 1) % win->x_nlines, win->x_col);
193: wclrtoeol(win->x_win);
194: wmove(win->x_win, win->x_line, win->x_col);
195: }